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1 /* ************************************************************************** */ |
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2 /* * For conditions of distribution and use, * */ |
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3 /* * see copyright notice in libmng.h * */ |
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4 /* ************************************************************************** */ |
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5 /* * * */ |
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6 /* * project : libmng * */ |
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7 /* * file : libmng_read.c copyright (c) 2000-2007 G.Juyn * */ |
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8 /* * version : 1.0.10 * */ |
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9 /* * * */ |
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10 /* * purpose : Read logic (implementation) * */ |
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11 /* * * */ |
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12 /* * author : G.Juyn * */ |
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13 /* * * */ |
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14 /* * comment : implementation of the high-level read logic * */ |
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15 /* * * */ |
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16 /* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */ |
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17 /* * - changed strict-ANSI stuff * */ |
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18 /* * 0.5.1 - 05/11/2000 - G.Juyn * */ |
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19 /* * - added callback error-reporting support * */ |
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20 /* * 0.5.1 - 05/12/2000 - G.Juyn * */ |
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21 /* * - changed trace to macro for callback error-reporting * */ |
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22 /* * * */ |
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23 /* * 0.5.2 - 05/19/2000 - G.Juyn * */ |
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24 /* * - cleaned up some code regarding mixed support * */ |
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25 /* * 0.5.2 - 05/20/2000 - G.Juyn * */ |
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26 /* * - added support for JNG * */ |
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27 /* * 0.5.2 - 05/31/2000 - G.Juyn * */ |
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28 /* * - fixed up punctuation (contribution by Tim Rowley) * */ |
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29 /* * * */ |
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30 /* * 0.5.3 - 06/16/2000 - G.Juyn * */ |
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31 /* * - changed progressive-display processing * */ |
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32 /* * * */ |
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33 /* * 0.9.1 - 07/08/2000 - G.Juyn * */ |
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34 /* * - changed read-processing for improved I/O-suspension * */ |
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35 /* * 0.9.1 - 07/14/2000 - G.Juyn * */ |
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36 /* * - changed EOF processing behavior * */ |
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37 /* * 0.9.1 - 07/14/2000 - G.Juyn * */ |
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38 /* * - changed default readbuffer size from 1024 to 4200 * */ |
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39 /* * * */ |
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40 /* * 0.9.2 - 07/27/2000 - G.Juyn * */ |
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41 /* * - B110320 - fixed GCC warning about mix-sized pointer math * */ |
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42 /* * 0.9.2 - 07/31/2000 - G.Juyn * */ |
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43 /* * - B110546 - fixed for improperly returning UNEXPECTEDEOF * */ |
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44 /* * 0.9.2 - 08/04/2000 - G.Juyn * */ |
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45 /* * - B111096 - fixed large-buffer read-suspension * */ |
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46 /* * 0.9.2 - 08/05/2000 - G.Juyn * */ |
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47 /* * - changed file-prefixes * */ |
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48 /* * * */ |
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49 /* * 0.9.3 - 08/26/2000 - G.Juyn * */ |
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50 /* * - added MAGN chunk * */ |
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51 /* * 0.9.3 - 10/11/2000 - G.Juyn * */ |
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52 /* * - removed test-MaGN * */ |
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53 /* * 0.9.3 - 10/16/2000 - G.Juyn * */ |
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54 /* * - added support for JDAA * */ |
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55 /* * * */ |
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56 /* * 0.9.5 - 01/23/2001 - G.Juyn * */ |
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57 /* * - fixed timing-problem with switching framing_modes * */ |
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58 /* * * */ |
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59 /* * 1.0.4 - 06/22/2002 - G.Juyn * */ |
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60 /* * - B495443 - incorrect suspend check in read_databuffer * */ |
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61 /* * * */ |
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62 /* * 1.0.5 - 07/04/2002 - G.Juyn * */ |
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63 /* * - added errorcode for extreme chunk-sizes * */ |
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64 /* * 1.0.5 - 07/08/2002 - G.Juyn * */ |
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65 /* * - B578572 - removed eMNGma hack (thanks Dimitri!) * */ |
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66 /* * 1.0.5 - 07/16/2002 - G.Juyn * */ |
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67 /* * - B581625 - large chunks fail with suspension reads * */ |
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68 /* * 1.0.5 - 08/19/2002 - G.Juyn * */ |
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69 /* * - B597134 - libmng pollutes the linker namespace * */ |
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70 /* * - added HLAPI function to copy chunks * */ |
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71 /* * 1.0.5 - 09/16/2002 - G.Juyn * */ |
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72 /* * - added event handling for dynamic MNG * */ |
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73 /* * * */ |
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74 /* * 1.0.6 - 05/25/2003 - G.R-P * */ |
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75 /* * - added MNG_SKIPCHUNK_cHNK footprint optimizations * */ |
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76 /* * 1.0.6 - 07/07/2003 - G.R-P * */ |
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77 /* * - added MNG_NO_DELTA_PNG reduction * */ |
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78 /* * - skip additional code when MNG_INCLUDE_JNG is not enabled * */ |
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79 /* * 1.0.6 - 07/29/2003 - G.R-P * */ |
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80 /* * - added conditionals around PAST chunk support * */ |
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81 /* * 1.0.6 - 08/17/2003 - G.R-P * */ |
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82 /* * - added conditionals around non-VLC chunk support * */ |
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83 /* * * */ |
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84 /* * 1.0.7 - 03/10/2004 - G.R-P * */ |
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85 /* * - added conditionals around openstream/closestream * */ |
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86 /* * * */ |
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87 /* * 1.0.8 - 04/08/2004 - G.Juyn * */ |
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88 /* * - added CRC existence & checking flags * */ |
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89 /* * 1.0.8 - 04/11/2004 - G.Juyn * */ |
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90 /* * - added data-push mechanisms for specialized decoders * */ |
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91 /* * 1.0.8 - 07/06/2004 - G.R-P * */ |
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92 /* * - defend against using undefined closestream function * */ |
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93 /* * 1.0.8 - 07/28/2004 - G.R-P * */ |
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94 /* * - added check for extreme chunk-lengths * */ |
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95 /* * * */ |
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96 /* * 1.0.9 - 09/16/2004 - G.Juyn * */ |
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97 /* * - fixed chunk pushing mechanism * */ |
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98 /* * 1.0.9 - 12/05/2004 - G.Juyn * */ |
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99 /* * - added conditional MNG_OPTIMIZE_CHUNKINITFREE * */ |
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100 /* * 1.0.9 - 12/06/2004 - G.Juyn * */ |
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101 /* * - added conditional MNG_OPTIMIZE_CHUNKASSIGN * */ |
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102 /* * - added conditional MNG_OPTIMIZE_CHUNKREADER * */ |
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103 /* * 1.0.9 - 12/20/2004 - G.Juyn * */ |
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104 /* * - cleaned up macro-invocations (thanks to D. Airlie) * */ |
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105 /* * 1.0.9 - 12/31/2004 - G.R-P * */ |
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106 /* * - removed stray characters from #ifdef directive * */ |
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107 /* * * */ |
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108 /* * 1.0.10 - 04/08/2007 - G.Juyn * */ |
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109 /* * - added support for mPNG proposal * */ |
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110 /* * * */ |
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111 /* ************************************************************************** */ |
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112 |
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113 #include "libmng.h" |
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114 #include "libmng_data.h" |
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115 #include "libmng_error.h" |
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116 #include "libmng_trace.h" |
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117 #ifdef __BORLANDC__ |
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118 #pragma hdrstop |
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119 #endif |
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120 #include "libmng_memory.h" |
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121 #include "libmng_objects.h" |
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122 #include "libmng_object_prc.h" |
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123 #include "libmng_chunks.h" |
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124 #ifdef MNG_OPTIMIZE_CHUNKREADER |
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125 #include "libmng_chunk_descr.h" |
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126 #endif |
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127 #include "libmng_chunk_prc.h" |
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128 #include "libmng_chunk_io.h" |
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129 #include "libmng_display.h" |
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130 #include "libmng_read.h" |
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131 |
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132 #if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI) |
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133 #pragma option -A /* force ANSI-C */ |
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134 #endif |
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135 |
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136 /* ************************************************************************** */ |
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137 |
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138 #ifdef MNG_INCLUDE_READ_PROCS |
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139 |
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140 /* ************************************************************************** */ |
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141 |
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142 mng_retcode mng_process_eof (mng_datap pData) |
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143 { |
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144 if (!pData->bEOF) /* haven't closed the stream yet ? */ |
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145 { |
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146 pData->bEOF = MNG_TRUE; /* now we do! */ |
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147 |
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148 #ifndef MNG_NO_OPEN_CLOSE_STREAM |
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149 if (pData->fClosestream && !pData->fClosestream ((mng_handle)pData)) |
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150 { |
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151 MNG_ERROR (pData, MNG_APPIOERROR); |
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152 } |
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153 #endif |
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154 } |
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155 |
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156 return MNG_NOERROR; |
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157 } |
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158 |
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159 /* ************************************************************************** */ |
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160 |
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161 mng_retcode mng_release_pushdata (mng_datap pData) |
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162 { |
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163 mng_pushdatap pFirst = pData->pFirstpushdata; |
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164 mng_pushdatap pNext = pFirst->pNext; |
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165 |
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166 #ifdef MNG_SUPPORT_TRACE |
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167 MNG_TRACE (pData, MNG_FN_RELEASE_PUSHDATA, MNG_LC_START); |
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168 #endif |
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169 |
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170 pData->pFirstpushdata = pNext; /* next becomes the first */ |
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171 |
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172 if (!pNext) /* no next? => no last! */ |
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173 pData->pLastpushdata = MNG_NULL; |
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174 /* buffer owned and release callback defined? */ |
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175 if ((pFirst->bOwned) && (pData->fReleasedata)) |
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176 pData->fReleasedata ((mng_handle)pData, pFirst->pData, pFirst->iLength); |
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177 else /* otherwise use internal free mechanism */ |
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178 MNG_FREEX (pData, pFirst->pData, pFirst->iLength); |
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179 /* and free it */ |
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180 MNG_FREEX (pData, pFirst, sizeof(mng_pushdata)); |
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181 |
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182 #ifdef MNG_SUPPORT_TRACE |
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183 MNG_TRACE (pData, MNG_FN_RELEASE_PUSHDATA, MNG_LC_END); |
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184 #endif |
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185 |
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186 return MNG_NOERROR; |
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187 } |
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188 |
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189 /* ************************************************************************** */ |
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190 |
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191 mng_retcode mng_release_pushchunk (mng_datap pData) |
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192 { |
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193 mng_pushdatap pFirst = pData->pFirstpushchunk; |
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194 mng_pushdatap pNext = pFirst->pNext; |
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195 |
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196 #ifdef MNG_SUPPORT_TRACE |
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197 MNG_TRACE (pData, MNG_FN_RELEASE_PUSHCHUNK, MNG_LC_START); |
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198 #endif |
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199 |
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200 pData->pFirstpushchunk = pNext; /* next becomes the first */ |
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201 |
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202 if (!pNext) /* no next? => no last! */ |
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203 pData->pLastpushchunk = MNG_NULL; |
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204 /* buffer owned and release callback defined? */ |
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205 if ((pFirst->bOwned) && (pData->fReleasedata)) |
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206 pData->fReleasedata ((mng_handle)pData, pFirst->pData, pFirst->iLength); |
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207 else /* otherwise use internal free mechanism */ |
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208 MNG_FREEX (pData, pFirst->pData, pFirst->iLength); |
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209 /* and free it */ |
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210 MNG_FREEX (pData, pFirst, sizeof(mng_pushdata)); |
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211 |
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212 #ifdef MNG_SUPPORT_TRACE |
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213 MNG_TRACE (pData, MNG_FN_RELEASE_PUSHCHUNK, MNG_LC_END); |
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214 #endif |
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215 |
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216 return MNG_NOERROR; |
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217 } |
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218 |
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219 /* ************************************************************************** */ |
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220 |
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221 MNG_LOCAL mng_retcode read_data (mng_datap pData, |
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222 mng_uint8p pBuf, |
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223 mng_uint32 iSize, |
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224 mng_uint32 * iRead) |
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225 { |
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226 mng_retcode iRetcode; |
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227 mng_uint32 iTempsize = iSize; |
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228 mng_uint8p pTempbuf = pBuf; |
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229 mng_pushdatap pPush = pData->pFirstpushdata; |
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230 mng_uint32 iPushsize = 0; |
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231 *iRead = 0; /* nothing yet */ |
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232 |
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233 #ifdef MNG_SUPPORT_TRACE |
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234 MNG_TRACE (pData, MNG_FN_READ_DATA, MNG_LC_START); |
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235 #endif |
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236 |
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237 while (pPush) /* calculate size of pushed data */ |
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238 { |
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239 iPushsize += pPush->iRemaining; |
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240 pPush = pPush->pNext; |
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241 } |
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242 |
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243 if (iTempsize <= iPushsize) /* got enough push data? */ |
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244 { |
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245 while (iTempsize) |
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246 { |
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247 pPush = pData->pFirstpushdata; |
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248 /* enough data remaining in this buffer? */ |
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249 if (pPush->iRemaining <= iTempsize) |
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250 { /* no: then copy what we've got */ |
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251 MNG_COPY (pTempbuf, pPush->pDatanext, pPush->iRemaining); |
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252 /* move pointers & lengths */ |
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253 pTempbuf += pPush->iRemaining; |
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254 *iRead += pPush->iRemaining; |
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255 iTempsize -= pPush->iRemaining; |
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256 /* release the depleted buffer */ |
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257 iRetcode = mng_release_pushdata (pData); |
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258 if (iRetcode) |
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259 return iRetcode; |
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260 } |
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261 else |
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262 { /* copy the needed bytes */ |
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263 MNG_COPY (pTempbuf, pPush->pDatanext, iTempsize); |
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264 /* move pointers & lengths */ |
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265 pPush->iRemaining -= iTempsize; |
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266 pPush->pDatanext += iTempsize; |
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267 pTempbuf += iTempsize; |
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268 *iRead += iTempsize; |
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269 iTempsize = 0; /* all done!!! */ |
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270 } |
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271 } |
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272 } |
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273 else |
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274 { |
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275 mng_uint32 iTempread = 0; |
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276 /* get it from the app then */ |
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277 if (!pData->fReaddata (((mng_handle)pData), pTempbuf, iTempsize, &iTempread)) |
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278 MNG_ERROR (pData, MNG_APPIOERROR); |
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279 |
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280 *iRead += iTempread; |
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281 } |
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282 |
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283 #ifdef MNG_SUPPORT_TRACE |
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284 MNG_TRACE (pData, MNG_FN_READ_DATA, MNG_LC_END); |
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285 #endif |
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286 |
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287 return MNG_NOERROR; |
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288 } |
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289 |
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290 /* ************************************************************************** */ |
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291 |
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292 MNG_LOCAL mng_retcode read_databuffer (mng_datap pData, |
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293 mng_uint8p pBuf, |
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294 mng_uint8p * pBufnext, |
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295 mng_uint32 iSize, |
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296 mng_uint32 * iRead) |
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297 { |
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298 mng_retcode iRetcode; |
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299 |
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300 #ifdef MNG_SUPPORT_TRACE |
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301 MNG_TRACE (pData, MNG_FN_READ_DATABUFFER, MNG_LC_START); |
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302 #endif |
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303 |
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304 if (pData->bSuspensionmode) |
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305 { |
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306 mng_uint8p pTemp; |
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307 mng_uint32 iTemp; |
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308 |
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309 *iRead = 0; /* let's be negative about the outcome */ |
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310 |
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311 if (!pData->pSuspendbuf) /* need to create a suspension buffer ? */ |
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312 { |
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313 pData->iSuspendbufsize = MNG_SUSPENDBUFFERSIZE; |
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314 /* so, create it */ |
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315 MNG_ALLOC (pData, pData->pSuspendbuf, pData->iSuspendbufsize); |
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316 |
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317 pData->iSuspendbufleft = 0; /* make sure to fill it first time */ |
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318 pData->pSuspendbufnext = pData->pSuspendbuf; |
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319 } |
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320 /* more than our buffer can hold ? */ |
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321 if (iSize > pData->iSuspendbufsize) |
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322 { |
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323 mng_uint32 iRemain; |
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324 |
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325 if (!*pBufnext) /* first time ? */ |
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326 { |
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327 if (pData->iSuspendbufleft) /* do we have some data left ? */ |
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328 { /* then copy it */ |
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329 MNG_COPY (pBuf, pData->pSuspendbufnext, pData->iSuspendbufleft); |
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330 /* fixup variables */ |
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331 *pBufnext = pBuf + pData->iSuspendbufleft; |
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332 pData->pSuspendbufnext = pData->pSuspendbuf; |
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333 pData->iSuspendbufleft = 0; |
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334 } |
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335 else |
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336 { |
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337 *pBufnext = pBuf; |
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338 } |
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339 } |
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340 /* calculate how much to get */ |
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341 iRemain = iSize - (mng_uint32)(*pBufnext - pBuf); |
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342 /* let's go get it */ |
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343 iRetcode = read_data (pData, *pBufnext, iRemain, &iTemp); |
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344 if (iRetcode) |
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345 return iRetcode; |
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346 /* first read after suspension return 0 means EOF */ |
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347 if ((pData->iSuspendpoint) && (iTemp == 0)) |
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348 { /* that makes it final */ |
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349 mng_retcode iRetcode = mng_process_eof (pData); |
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350 if (iRetcode) /* on error bail out */ |
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351 return iRetcode; |
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352 /* indicate the source is depleted */ |
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353 *iRead = iSize - iRemain + iTemp; |
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354 } |
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355 else |
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356 { |
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357 if (iTemp < iRemain) /* suspension required ? */ |
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358 { |
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359 *pBufnext = *pBufnext + iTemp; |
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360 pData->bSuspended = MNG_TRUE; |
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361 } |
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362 else |
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363 { |
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364 *iRead = iSize; /* got it all now ! */ |
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365 } |
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366 } |
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367 } |
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368 else |
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369 { /* need to read some more ? */ |
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370 while ((!pData->bSuspended) && (!pData->bEOF) && (iSize > pData->iSuspendbufleft)) |
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371 { /* not enough space left in buffer ? */ |
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372 if (pData->iSuspendbufsize - pData->iSuspendbufleft - |
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373 (mng_uint32)(pData->pSuspendbufnext - pData->pSuspendbuf) < |
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374 MNG_SUSPENDREQUESTSIZE) |
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375 { |
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376 if (pData->iSuspendbufleft) /* then lets shift (if there's anything left) */ |
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377 MNG_COPY (pData->pSuspendbuf, pData->pSuspendbufnext, pData->iSuspendbufleft); |
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378 /* adjust running pointer */ |
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379 pData->pSuspendbufnext = pData->pSuspendbuf; |
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380 } |
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381 /* still not enough room ? */ |
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382 if (pData->iSuspendbufsize - pData->iSuspendbufleft < MNG_SUSPENDREQUESTSIZE) |
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383 MNG_ERROR (pData, MNG_INTERNALERROR); |
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384 /* now read some more data */ |
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385 pTemp = pData->pSuspendbufnext + pData->iSuspendbufleft; |
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386 |
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387 iRetcode = read_data (pData, pTemp, MNG_SUSPENDREQUESTSIZE, &iTemp); |
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388 if (iRetcode) |
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389 return iRetcode; |
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390 /* adjust fill-counter */ |
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391 pData->iSuspendbufleft += iTemp; |
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392 /* first read after suspension returning 0 means EOF */ |
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393 if ((pData->iSuspendpoint) && (iTemp == 0)) |
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394 { /* that makes it final */ |
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395 mng_retcode iRetcode = mng_process_eof (pData); |
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396 if (iRetcode) /* on error bail out */ |
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397 return iRetcode; |
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398 |
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399 if (pData->iSuspendbufleft) /* return the leftover scraps */ |
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400 MNG_COPY (pBuf, pData->pSuspendbufnext, pData->iSuspendbufleft); |
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401 /* and indicate so */ |
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402 *iRead = pData->iSuspendbufleft; |
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403 pData->pSuspendbufnext = pData->pSuspendbuf; |
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404 pData->iSuspendbufleft = 0; |
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405 } |
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406 else |
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407 { /* suspension required ? */ |
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408 if ((iSize > pData->iSuspendbufleft) && (iTemp < MNG_SUSPENDREQUESTSIZE)) |
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409 pData->bSuspended = MNG_TRUE; |
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410 |
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411 } |
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412 |
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413 pData->iSuspendpoint = 0; /* reset it here in case we loop back */ |
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414 } |
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415 |
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416 if ((!pData->bSuspended) && (!pData->bEOF)) |
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417 { /* return the data ! */ |
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418 MNG_COPY (pBuf, pData->pSuspendbufnext, iSize); |
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419 |
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420 *iRead = iSize; /* returned it all */ |
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421 /* adjust suspension-buffer variables */ |
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422 pData->pSuspendbufnext += iSize; |
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423 pData->iSuspendbufleft -= iSize; |
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424 } |
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425 } |
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426 } |
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427 else |
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428 { |
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429 iRetcode = read_data (pData, (mng_ptr)pBuf, iSize, iRead); |
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430 if (iRetcode) |
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431 return iRetcode; |
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432 if (*iRead == 0) /* suspension required ? */ |
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433 pData->bSuspended = MNG_TRUE; |
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434 } |
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435 |
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436 pData->iSuspendpoint = 0; /* safely reset it here ! */ |
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437 |
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438 #ifdef MNG_SUPPORT_TRACE |
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439 MNG_TRACE (pData, MNG_FN_READ_DATABUFFER, MNG_LC_END); |
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440 #endif |
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441 |
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442 return MNG_NOERROR; |
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443 } |
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444 |
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445 /* ************************************************************************** */ |
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446 |
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447 MNG_LOCAL mng_retcode process_raw_chunk (mng_datap pData, |
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448 mng_uint8p pBuf, |
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449 mng_uint32 iBuflen) |
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450 { |
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451 |
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452 #ifndef MNG_OPTIMIZE_CHUNKREADER |
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453 /* the table-idea & binary search code was adapted from |
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454 libpng 1.1.0 (pngread.c) */ |
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455 /* NOTE1: the table must remain sorted by chunkname, otherwise the binary |
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456 search will break !!! (ps. watch upper-/lower-case chunknames !!) */ |
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457 /* NOTE2: the layout must remain equal to the header part of all the |
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458 chunk-structures (yes, that means even the pNext and pPrev fields; |
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459 it's wasting a bit of space, but hey, the code is a lot easier) */ |
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460 |
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461 #ifdef MNG_OPTIMIZE_CHUNKINITFREE |
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462 mng_chunk_header mng_chunk_unknown = {MNG_UINT_HUH, mng_init_general, mng_free_unknown, |
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463 mng_read_unknown, mng_write_unknown, mng_assign_unknown, 0, 0, sizeof(mng_unknown_chunk)}; |
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464 #else |
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465 mng_chunk_header mng_chunk_unknown = {MNG_UINT_HUH, mng_init_unknown, mng_free_unknown, |
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466 mng_read_unknown, mng_write_unknown, mng_assign_unknown, 0, 0}; |
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467 #endif |
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468 |
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469 #ifdef MNG_OPTIMIZE_CHUNKINITFREE |
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470 |
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471 mng_chunk_header mng_chunk_table [] = |
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472 { |
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473 #ifndef MNG_SKIPCHUNK_BACK |
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474 {MNG_UINT_BACK, mng_init_general, mng_free_general, mng_read_back, mng_write_back, mng_assign_general, 0, 0, sizeof(mng_back)}, |
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475 #endif |
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476 #ifndef MNG_SKIPCHUNK_BASI |
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477 {MNG_UINT_BASI, mng_init_general, mng_free_general, mng_read_basi, mng_write_basi, mng_assign_general, 0, 0, sizeof(mng_basi)}, |
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478 #endif |
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479 #ifndef MNG_SKIPCHUNK_CLIP |
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480 {MNG_UINT_CLIP, mng_init_general, mng_free_general, mng_read_clip, mng_write_clip, mng_assign_general, 0, 0, sizeof(mng_clip)}, |
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481 #endif |
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482 #ifndef MNG_SKIPCHUNK_CLON |
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483 {MNG_UINT_CLON, mng_init_general, mng_free_general, mng_read_clon, mng_write_clon, mng_assign_general, 0, 0, sizeof(mng_clon)}, |
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484 #endif |
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485 #ifndef MNG_NO_DELTA_PNG |
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486 #ifndef MNG_SKIPCHUNK_DBYK |
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487 {MNG_UINT_DBYK, mng_init_general, mng_free_dbyk, mng_read_dbyk, mng_write_dbyk, mng_assign_dbyk, 0, 0, sizeof(mng_dbyk)}, |
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488 #endif |
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489 #endif |
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490 #ifndef MNG_SKIPCHUNK_DEFI |
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491 {MNG_UINT_DEFI, mng_init_general, mng_free_general, mng_read_defi, mng_write_defi, mng_assign_general, 0, 0, sizeof(mng_defi)}, |
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492 #endif |
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493 #ifndef MNG_NO_DELTA_PNG |
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494 {MNG_UINT_DHDR, mng_init_general, mng_free_general, mng_read_dhdr, mng_write_dhdr, mng_assign_general, 0, 0, sizeof(mng_dhdr)}, |
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495 #endif |
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496 #ifndef MNG_SKIPCHUNK_DISC |
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497 {MNG_UINT_DISC, mng_init_general, mng_free_disc, mng_read_disc, mng_write_disc, mng_assign_disc, 0, 0, sizeof(mng_disc)}, |
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498 #endif |
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499 #ifndef MNG_NO_DELTA_PNG |
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500 #ifndef MNG_SKIPCHUNK_DROP |
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501 {MNG_UINT_DROP, mng_init_general, mng_free_drop, mng_read_drop, mng_write_drop, mng_assign_drop, 0, 0, sizeof(mng_drop)}, |
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502 #endif |
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503 #endif |
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504 #ifndef MNG_SKIPCHUNK_LOOP |
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505 {MNG_UINT_ENDL, mng_init_general, mng_free_general, mng_read_endl, mng_write_endl, mng_assign_general, 0, 0, sizeof(mng_endl)}, |
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506 #endif |
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507 #ifndef MNG_SKIPCHUNK_FRAM |
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508 {MNG_UINT_FRAM, mng_init_general, mng_free_fram, mng_read_fram, mng_write_fram, mng_assign_fram, 0, 0, sizeof(mng_fram)}, |
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509 #endif |
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510 {MNG_UINT_IDAT, mng_init_general, mng_free_idat, mng_read_idat, mng_write_idat, mng_assign_idat, 0, 0, sizeof(mng_idat)}, /* 12-th element! */ |
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511 {MNG_UINT_IEND, mng_init_general, mng_free_general, mng_read_iend, mng_write_iend, mng_assign_general, 0, 0, sizeof(mng_iend)}, |
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512 {MNG_UINT_IHDR, mng_init_general, mng_free_general, mng_read_ihdr, mng_write_ihdr, mng_assign_general, 0, 0, sizeof(mng_ihdr)}, |
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513 #ifndef MNG_NO_DELTA_PNG |
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514 #ifdef MNG_INCLUDE_JNG |
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515 {MNG_UINT_IJNG, mng_init_general, mng_free_general, mng_read_ijng, mng_write_ijng, mng_assign_general, 0, 0, sizeof(mng_ijng)}, |
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516 #endif |
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517 {MNG_UINT_IPNG, mng_init_general, mng_free_general, mng_read_ipng, mng_write_ipng, mng_assign_general, 0, 0, sizeof(mng_ipng)}, |
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518 #endif |
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519 #ifdef MNG_INCLUDE_JNG |
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520 {MNG_UINT_JDAA, mng_init_general, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0, sizeof(mng_jdaa)}, |
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521 {MNG_UINT_JDAT, mng_init_general, mng_free_jdat, mng_read_jdat, mng_write_jdat, mng_assign_jdat, 0, 0, sizeof(mng_jdat)}, |
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522 {MNG_UINT_JHDR, mng_init_general, mng_free_general, mng_read_jhdr, mng_write_jhdr, mng_assign_general, 0, 0, sizeof(mng_jhdr)}, |
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523 {MNG_UINT_JSEP, mng_init_general, mng_free_general, mng_read_jsep, mng_write_jsep, mng_assign_general, 0, 0, sizeof(mng_jsep)}, |
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524 {MNG_UINT_JdAA, mng_init_general, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0, sizeof(mng_jdaa)}, |
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525 #endif |
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526 #ifndef MNG_SKIPCHUNK_LOOP |
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527 {MNG_UINT_LOOP, mng_init_general, mng_free_loop, mng_read_loop, mng_write_loop, mng_assign_loop, 0, 0, sizeof(mng_loop)}, |
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528 #endif |
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529 #ifndef MNG_SKIPCHUNK_MAGN |
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530 {MNG_UINT_MAGN, mng_init_general, mng_free_general, mng_read_magn, mng_write_magn, mng_assign_general, 0, 0, sizeof(mng_magn)}, |
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531 #endif |
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532 {MNG_UINT_MEND, mng_init_general, mng_free_general, mng_read_mend, mng_write_mend, mng_assign_general, 0, 0, sizeof(mng_mend)}, |
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533 {MNG_UINT_MHDR, mng_init_general, mng_free_general, mng_read_mhdr, mng_write_mhdr, mng_assign_general, 0, 0, sizeof(mng_mhdr)}, |
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534 #ifndef MNG_SKIPCHUNK_MOVE |
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535 {MNG_UINT_MOVE, mng_init_general, mng_free_general, mng_read_move, mng_write_move, mng_assign_general, 0, 0, sizeof(mng_move)}, |
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536 #endif |
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537 #ifndef MNG_NO_DELTA_PNG |
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538 #ifndef MNG_SKIPCHUNK_ORDR |
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539 {MNG_UINT_ORDR, mng_init_general, mng_free_ordr, mng_read_ordr, mng_write_ordr, mng_assign_ordr, 0, 0, sizeof(mng_ordr)}, |
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540 #endif |
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541 #endif |
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542 #ifndef MNG_SKIPCHUNK_PAST |
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543 {MNG_UINT_PAST, mng_init_general, mng_free_past, mng_read_past, mng_write_past, mng_assign_past, 0, 0, sizeof(mng_past)}, |
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544 #endif |
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545 {MNG_UINT_PLTE, mng_init_general, mng_free_general, mng_read_plte, mng_write_plte, mng_assign_general, 0, 0, sizeof(mng_plte)}, |
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546 #ifndef MNG_NO_DELTA_PNG |
|
547 {MNG_UINT_PPLT, mng_init_general, mng_free_general, mng_read_pplt, mng_write_pplt, mng_assign_general, 0, 0, sizeof(mng_pplt)}, |
|
548 {MNG_UINT_PROM, mng_init_general, mng_free_general, mng_read_prom, mng_write_prom, mng_assign_general, 0, 0, sizeof(mng_prom)}, |
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549 #endif |
|
550 #ifndef MNG_SKIPCHUNK_SAVE |
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551 {MNG_UINT_SAVE, mng_init_general, mng_free_save, mng_read_save, mng_write_save, mng_assign_save, 0, 0, sizeof(mng_save)}, |
|
552 #endif |
|
553 #ifndef MNG_SKIPCHUNK_SEEK |
|
554 {MNG_UINT_SEEK, mng_init_general, mng_free_seek, mng_read_seek, mng_write_seek, mng_assign_seek, 0, 0, sizeof(mng_seek)}, |
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555 #endif |
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556 #ifndef MNG_SKIPCHUNK_SHOW |
|
557 {MNG_UINT_SHOW, mng_init_general, mng_free_general, mng_read_show, mng_write_show, mng_assign_general, 0, 0, sizeof(mng_show)}, |
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558 #endif |
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559 #ifndef MNG_SKIPCHUNK_TERM |
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560 {MNG_UINT_TERM, mng_init_general, mng_free_general, mng_read_term, mng_write_term, mng_assign_general, 0, 0, sizeof(mng_term)}, |
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561 #endif |
|
562 #ifndef MNG_SKIPCHUNK_bKGD |
|
563 {MNG_UINT_bKGD, mng_init_general, mng_free_general, mng_read_bkgd, mng_write_bkgd, mng_assign_general, 0, 0, sizeof(mng_bkgd)}, |
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564 #endif |
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565 #ifndef MNG_SKIPCHUNK_cHRM |
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566 {MNG_UINT_cHRM, mng_init_general, mng_free_general, mng_read_chrm, mng_write_chrm, mng_assign_general, 0, 0, sizeof(mng_chrm)}, |
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567 #endif |
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568 #ifndef MNG_SKIPCHUNK_eXPI |
|
569 {MNG_UINT_eXPI, mng_init_general, mng_free_expi, mng_read_expi, mng_write_expi, mng_assign_expi, 0, 0, sizeof(mng_expi)}, |
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570 #endif |
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571 #ifndef MNG_SKIPCHUNK_evNT |
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572 {MNG_UINT_evNT, mng_init_general, mng_free_evnt, mng_read_evnt, mng_write_evnt, mng_assign_evnt, 0, 0, sizeof(mng_evnt)}, |
|
573 #endif |
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574 #ifndef MNG_SKIPCHUNK_fPRI |
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575 {MNG_UINT_fPRI, mng_init_general, mng_free_general, mng_read_fpri, mng_write_fpri, mng_assign_general, 0, 0, sizeof(mng_fpri)}, |
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576 #endif |
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577 #ifndef MNG_SKIPCHUNK_gAMA |
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578 {MNG_UINT_gAMA, mng_init_general, mng_free_general, mng_read_gama, mng_write_gama, mng_assign_general, 0, 0, sizeof(mng_gama)}, |
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579 #endif |
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580 #ifndef MNG_SKIPCHUNK_hIST |
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581 {MNG_UINT_hIST, mng_init_general, mng_free_general, mng_read_hist, mng_write_hist, mng_assign_general, 0, 0, sizeof(mng_hist)}, |
|
582 #endif |
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583 #ifndef MNG_SKIPCHUNK_iCCP |
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584 {MNG_UINT_iCCP, mng_init_general, mng_free_iccp, mng_read_iccp, mng_write_iccp, mng_assign_iccp, 0, 0, sizeof(mng_iccp)}, |
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585 #endif |
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586 #ifndef MNG_SKIPCHUNK_iTXt |
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587 {MNG_UINT_iTXt, mng_init_general, mng_free_itxt, mng_read_itxt, mng_write_itxt, mng_assign_itxt, 0, 0, sizeof(mng_itxt)}, |
|
588 #endif |
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589 #ifdef MNG_INCLUDE_MPNG_PROPOSAL |
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590 {MNG_UINT_mpNG, mng_init_general, mng_free_mpng, mng_read_mpng, mng_write_mpng, mng_assign_mpng, 0, 0, sizeof(mng_mpng)}, |
|
591 #endif |
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592 #ifndef MNG_SKIPCHUNK_nEED |
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593 {MNG_UINT_nEED, mng_init_general, mng_free_need, mng_read_need, mng_write_need, mng_assign_need, 0, 0, sizeof(mng_need)}, |
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594 #endif |
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595 /* TODO: {MNG_UINT_oFFs, 0, 0, 0, 0, 0, 0}, */ |
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596 /* TODO: {MNG_UINT_pCAL, 0, 0, 0, 0, 0, 0}, */ |
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597 #ifndef MNG_SKIPCHUNK_pHYg |
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598 {MNG_UINT_pHYg, mng_init_general, mng_free_general, mng_read_phyg, mng_write_phyg, mng_assign_general, 0, 0, sizeof(mng_phyg)}, |
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599 #endif |
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600 #ifndef MNG_SKIPCHUNK_pHYs |
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601 {MNG_UINT_pHYs, mng_init_general, mng_free_general, mng_read_phys, mng_write_phys, mng_assign_general, 0, 0, sizeof(mng_phys)}, |
|
602 #endif |
|
603 #ifndef MNG_SKIPCHUNK_sBIT |
|
604 {MNG_UINT_sBIT, mng_init_general, mng_free_general, mng_read_sbit, mng_write_sbit, mng_assign_general, 0, 0, sizeof(mng_sbit)}, |
|
605 #endif |
|
606 /* TODO: {MNG_UINT_sCAL, 0, 0, 0, 0, 0, 0}, */ |
|
607 #ifndef MNG_SKIPCHUNK_sPLT |
|
608 {MNG_UINT_sPLT, mng_init_general, mng_free_splt, mng_read_splt, mng_write_splt, mng_assign_splt, 0, 0, sizeof(mng_splt)}, |
|
609 #endif |
|
610 {MNG_UINT_sRGB, mng_init_general, mng_free_general, mng_read_srgb, mng_write_srgb, mng_assign_general, 0, 0, sizeof(mng_srgb)}, |
|
611 #ifndef MNG_SKIPCHUNK_tEXt |
|
612 {MNG_UINT_tEXt, mng_init_general, mng_free_text, mng_read_text, mng_write_text, mng_assign_text, 0, 0, sizeof(mng_text)}, |
|
613 #endif |
|
614 #ifndef MNG_SKIPCHUNK_tIME |
|
615 {MNG_UINT_tIME, mng_init_general, mng_free_general, mng_read_time, mng_write_time, mng_assign_general, 0, 0, sizeof(mng_time)}, |
|
616 #endif |
|
617 {MNG_UINT_tRNS, mng_init_general, mng_free_general, mng_read_trns, mng_write_trns, mng_assign_general, 0, 0, sizeof(mng_trns)}, |
|
618 #ifndef MNG_SKIPCHUNK_zTXt |
|
619 {MNG_UINT_zTXt, mng_init_general, mng_free_ztxt, mng_read_ztxt, mng_write_ztxt, mng_assign_ztxt, 0, 0, sizeof(mng_ztxt)}, |
|
620 #endif |
|
621 }; |
|
622 |
|
623 #else /* MNG_OPTIMIZE_CHUNKINITFREE */ |
|
624 |
|
625 mng_chunk_header mng_chunk_table [] = |
|
626 { |
|
627 #ifndef MNG_SKIPCHUNK_BACK |
|
628 {MNG_UINT_BACK, mng_init_back, mng_free_back, mng_read_back, mng_write_back, mng_assign_back, 0, 0}, |
|
629 #endif |
|
630 #ifndef MNG_SKIPCHUNK_BASI |
|
631 {MNG_UINT_BASI, mng_init_basi, mng_free_basi, mng_read_basi, mng_write_basi, mng_assign_basi, 0, 0}, |
|
632 #endif |
|
633 #ifndef MNG_SKIPCHUNK_CLIP |
|
634 {MNG_UINT_CLIP, mng_init_clip, mng_free_clip, mng_read_clip, mng_write_clip, mng_assign_clip, 0, 0}, |
|
635 #endif |
|
636 #ifndef MNG_SKIPCHUNK_CLON |
|
637 {MNG_UINT_CLON, mng_init_clon, mng_free_clon, mng_read_clon, mng_write_clon, mng_assign_clon, 0, 0}, |
|
638 #endif |
|
639 #ifndef MNG_NO_DELTA_PNG |
|
640 #ifndef MNG_SKIPCHUNK_DBYK |
|
641 {MNG_UINT_DBYK, mng_init_dbyk, mng_free_dbyk, mng_read_dbyk, mng_write_dbyk, mng_assign_dbyk, 0, 0}, |
|
642 #endif |
|
643 #endif |
|
644 #ifndef MNG_SKIPCHUNK_DEFI |
|
645 {MNG_UINT_DEFI, mng_init_defi, mng_free_defi, mng_read_defi, mng_write_defi, mng_assign_defi, 0, 0}, |
|
646 #endif |
|
647 #ifndef MNG_NO_DELTA_PNG |
|
648 {MNG_UINT_DHDR, mng_init_dhdr, mng_free_dhdr, mng_read_dhdr, mng_write_dhdr, mng_assign_dhdr, 0, 0}, |
|
649 #endif |
|
650 #ifndef MNG_SKIPCHUNK_DISC |
|
651 {MNG_UINT_DISC, mng_init_disc, mng_free_disc, mng_read_disc, mng_write_disc, mng_assign_disc, 0, 0}, |
|
652 #endif |
|
653 #ifndef MNG_NO_DELTA_PNG |
|
654 #ifndef MNG_SKIPCHUNK_DROP |
|
655 {MNG_UINT_DROP, mng_init_drop, mng_free_drop, mng_read_drop, mng_write_drop, mng_assign_drop, 0, 0}, |
|
656 #endif |
|
657 #endif |
|
658 #ifndef MNG_SKIPCHUNK_LOOP |
|
659 {MNG_UINT_ENDL, mng_init_endl, mng_free_endl, mng_read_endl, mng_write_endl, mng_assign_endl, 0, 0}, |
|
660 #endif |
|
661 #ifndef MNG_SKIPCHUNK_FRAM |
|
662 {MNG_UINT_FRAM, mng_init_fram, mng_free_fram, mng_read_fram, mng_write_fram, mng_assign_fram, 0, 0}, |
|
663 #endif |
|
664 {MNG_UINT_IDAT, mng_init_idat, mng_free_idat, mng_read_idat, mng_write_idat, mng_assign_idat, 0, 0}, /* 12-th element! */ |
|
665 {MNG_UINT_IEND, mng_init_iend, mng_free_iend, mng_read_iend, mng_write_iend, mng_assign_iend, 0, 0}, |
|
666 {MNG_UINT_IHDR, mng_init_ihdr, mng_free_ihdr, mng_read_ihdr, mng_write_ihdr, mng_assign_ihdr, 0, 0}, |
|
667 #ifndef MNG_NO_DELTA_PNG |
|
668 #ifdef MNG_INCLUDE_JNG |
|
669 {MNG_UINT_IJNG, mng_init_ijng, mng_free_ijng, mng_read_ijng, mng_write_ijng, mng_assign_ijng, 0, 0}, |
|
670 #endif |
|
671 {MNG_UINT_IPNG, mng_init_ipng, mng_free_ipng, mng_read_ipng, mng_write_ipng, mng_assign_ipng, 0, 0}, |
|
672 #endif |
|
673 #ifdef MNG_INCLUDE_JNG |
|
674 {MNG_UINT_JDAA, mng_init_jdaa, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0}, |
|
675 {MNG_UINT_JDAT, mng_init_jdat, mng_free_jdat, mng_read_jdat, mng_write_jdat, mng_assign_jdat, 0, 0}, |
|
676 {MNG_UINT_JHDR, mng_init_jhdr, mng_free_jhdr, mng_read_jhdr, mng_write_jhdr, mng_assign_jhdr, 0, 0}, |
|
677 {MNG_UINT_JSEP, mng_init_jsep, mng_free_jsep, mng_read_jsep, mng_write_jsep, mng_assign_jsep, 0, 0}, |
|
678 {MNG_UINT_JdAA, mng_init_jdaa, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0}, |
|
679 #endif |
|
680 #ifndef MNG_SKIPCHUNK_LOOP |
|
681 {MNG_UINT_LOOP, mng_init_loop, mng_free_loop, mng_read_loop, mng_write_loop, mng_assign_loop, 0, 0}, |
|
682 #endif |
|
683 #ifndef MNG_SKIPCHUNK_MAGN |
|
684 {MNG_UINT_MAGN, mng_init_magn, mng_free_magn, mng_read_magn, mng_write_magn, mng_assign_magn, 0, 0}, |
|
685 #endif |
|
686 {MNG_UINT_MEND, mng_init_mend, mng_free_mend, mng_read_mend, mng_write_mend, mng_assign_mend, 0, 0}, |
|
687 {MNG_UINT_MHDR, mng_init_mhdr, mng_free_mhdr, mng_read_mhdr, mng_write_mhdr, mng_assign_mhdr, 0, 0}, |
|
688 #ifndef MNG_SKIPCHUNK_MOVE |
|
689 {MNG_UINT_MOVE, mng_init_move, mng_free_move, mng_read_move, mng_write_move, mng_assign_move, 0, 0}, |
|
690 #endif |
|
691 #ifndef MNG_NO_DELTA_PNG |
|
692 #ifndef MNG_SKIPCHUNK_ORDR |
|
693 {MNG_UINT_ORDR, mng_init_ordr, mng_free_ordr, mng_read_ordr, mng_write_ordr, mng_assign_ordr, 0, 0}, |
|
694 #endif |
|
695 #endif |
|
696 #ifndef MNG_SKIPCHUNK_PAST |
|
697 {MNG_UINT_PAST, mng_init_past, mng_free_past, mng_read_past, mng_write_past, mng_assign_past, 0, 0}, |
|
698 #endif |
|
699 {MNG_UINT_PLTE, mng_init_plte, mng_free_plte, mng_read_plte, mng_write_plte, mng_assign_plte, 0, 0}, |
|
700 #ifndef MNG_NO_DELTA_PNG |
|
701 {MNG_UINT_PPLT, mng_init_pplt, mng_free_pplt, mng_read_pplt, mng_write_pplt, mng_assign_pplt, 0, 0}, |
|
702 {MNG_UINT_PROM, mng_init_prom, mng_free_prom, mng_read_prom, mng_write_prom, mng_assign_prom, 0, 0}, |
|
703 #endif |
|
704 #ifndef MNG_SKIPCHUNK_SAVE |
|
705 {MNG_UINT_SAVE, mng_init_save, mng_free_save, mng_read_save, mng_write_save, mng_assign_save, 0, 0}, |
|
706 #endif |
|
707 #ifndef MNG_SKIPCHUNK_SEEK |
|
708 {MNG_UINT_SEEK, mng_init_seek, mng_free_seek, mng_read_seek, mng_write_seek, mng_assign_seek, 0, 0}, |
|
709 #endif |
|
710 #ifndef MNG_SKIPCHUNK_SHOW |
|
711 {MNG_UINT_SHOW, mng_init_show, mng_free_show, mng_read_show, mng_write_show, mng_assign_show, 0, 0}, |
|
712 #endif |
|
713 #ifndef MNG_SKIPCHUNK_TERM |
|
714 {MNG_UINT_TERM, mng_init_term, mng_free_term, mng_read_term, mng_write_term, mng_assign_term, 0, 0}, |
|
715 #endif |
|
716 #ifndef MNG_SKIPCHUNK_bKGD |
|
717 {MNG_UINT_bKGD, mng_init_bkgd, mng_free_bkgd, mng_read_bkgd, mng_write_bkgd, mng_assign_bkgd, 0, 0}, |
|
718 #endif |
|
719 #ifndef MNG_SKIPCHUNK_cHRM |
|
720 {MNG_UINT_cHRM, mng_init_chrm, mng_free_chrm, mng_read_chrm, mng_write_chrm, mng_assign_chrm, 0, 0}, |
|
721 #endif |
|
722 #ifndef MNG_SKIPCHUNK_eXPI |
|
723 {MNG_UINT_eXPI, mng_init_expi, mng_free_expi, mng_read_expi, mng_write_expi, mng_assign_expi, 0, 0}, |
|
724 #endif |
|
725 #ifndef MNG_SKIPCHUNK_evNT |
|
726 {MNG_UINT_evNT, mng_init_evnt, mng_free_evnt, mng_read_evnt, mng_write_evnt, mng_assign_evnt, 0, 0}, |
|
727 #endif |
|
728 #ifndef MNG_SKIPCHUNK_fPRI |
|
729 {MNG_UINT_fPRI, mng_init_fpri, mng_free_fpri, mng_read_fpri, mng_write_fpri, mng_assign_fpri, 0, 0}, |
|
730 #endif |
|
731 #ifndef MNG_SKIPCHUNK_gAMA |
|
732 {MNG_UINT_gAMA, mng_init_gama, mng_free_gama, mng_read_gama, mng_write_gama, mng_assign_gama, 0, 0}, |
|
733 #endif |
|
734 #ifndef MNG_SKIPCHUNK_hIST |
|
735 {MNG_UINT_hIST, mng_init_hist, mng_free_hist, mng_read_hist, mng_write_hist, mng_assign_hist, 0, 0}, |
|
736 #endif |
|
737 #ifndef MNG_SKIPCHUNK_iCCP |
|
738 {MNG_UINT_iCCP, mng_init_iccp, mng_free_iccp, mng_read_iccp, mng_write_iccp, mng_assign_iccp, 0, 0}, |
|
739 #endif |
|
740 #ifndef MNG_SKIPCHUNK_iTXt |
|
741 {MNG_UINT_iTXt, mng_init_itxt, mng_free_itxt, mng_read_itxt, mng_write_itxt, mng_assign_itxt, 0, 0}, |
|
742 #endif |
|
743 #ifndef MNG_SKIPCHUNK_nEED |
|
744 {MNG_UINT_nEED, mng_init_need, mng_free_need, mng_read_need, mng_write_need, mng_assign_need, 0, 0}, |
|
745 #endif |
|
746 /* TODO: {MNG_UINT_oFFs, 0, 0, 0, 0, 0, 0}, */ |
|
747 /* TODO: {MNG_UINT_pCAL, 0, 0, 0, 0, 0, 0}, */ |
|
748 #ifndef MNG_SKIPCHUNK_pHYg |
|
749 {MNG_UINT_pHYg, mng_init_phyg, mng_free_phyg, mng_read_phyg, mng_write_phyg, mng_assign_phyg, 0, 0}, |
|
750 #endif |
|
751 #ifndef MNG_SKIPCHUNK_pHYs |
|
752 {MNG_UINT_pHYs, mng_init_phys, mng_free_phys, mng_read_phys, mng_write_phys, mng_assign_phys, 0, 0}, |
|
753 #endif |
|
754 #ifndef MNG_SKIPCHUNK_sBIT |
|
755 {MNG_UINT_sBIT, mng_init_sbit, mng_free_sbit, mng_read_sbit, mng_write_sbit, mng_assign_sbit, 0, 0}, |
|
756 #endif |
|
757 /* TODO: {MNG_UINT_sCAL, 0, 0, 0, 0, 0, 0}, */ |
|
758 #ifndef MNG_SKIPCHUNK_sPLT |
|
759 {MNG_UINT_sPLT, mng_init_splt, mng_free_splt, mng_read_splt, mng_write_splt, mng_assign_splt, 0, 0}, |
|
760 #endif |
|
761 {MNG_UINT_sRGB, mng_init_srgb, mng_free_srgb, mng_read_srgb, mng_write_srgb, mng_assign_srgb, 0, 0}, |
|
762 #ifndef MNG_SKIPCHUNK_tEXt |
|
763 {MNG_UINT_tEXt, mng_init_text, mng_free_text, mng_read_text, mng_write_text, mng_assign_text, 0, 0}, |
|
764 #endif |
|
765 #ifndef MNG_SKIPCHUNK_tIME |
|
766 {MNG_UINT_tIME, mng_init_time, mng_free_time, mng_read_time, mng_write_time, mng_assign_time, 0, 0}, |
|
767 #endif |
|
768 {MNG_UINT_tRNS, mng_init_trns, mng_free_trns, mng_read_trns, mng_write_trns, mng_assign_trns, 0, 0}, |
|
769 #ifndef MNG_SKIPCHUNK_zTXt |
|
770 {MNG_UINT_zTXt, mng_init_ztxt, mng_free_ztxt, mng_read_ztxt, mng_write_ztxt, mng_assign_ztxt, 0, 0}, |
|
771 #endif |
|
772 }; |
|
773 |
|
774 #endif /* MNG_OPTIMIZE_CHUNKINITFREE */ |
|
775 |
|
776 /* binary search variables */ |
|
777 mng_int32 iTop, iLower, iUpper, iMiddle; |
|
778 mng_chunk_headerp pEntry; /* pointer to found entry */ |
|
779 #else |
|
780 mng_chunk_header sEntry; /* temp chunk-header */ |
|
781 #endif /* MNG_OPTIMIZE_CHUNKREADER */ |
|
782 |
|
783 mng_chunkid iChunkname; /* the chunk's tag */ |
|
784 mng_chunkp pChunk; /* chunk structure (if #define MNG_STORE_CHUNKS) */ |
|
785 mng_retcode iRetcode; /* temporary error-code */ |
|
786 |
|
787 #ifdef MNG_SUPPORT_TRACE |
|
788 MNG_TRACE (pData, MNG_FN_PROCESS_RAW_CHUNK, MNG_LC_START); |
|
789 #endif |
|
790 /* reset timer indicator on read-cycle */ |
|
791 if ((pData->bReading) && (!pData->bDisplaying)) |
|
792 pData->bTimerset = MNG_FALSE; |
|
793 /* get the chunkname */ |
|
794 iChunkname = (mng_chunkid)(mng_get_uint32 (pBuf)); |
|
795 |
|
796 pBuf += sizeof (mng_chunkid); /* adjust the buffer */ |
|
797 iBuflen -= sizeof (mng_chunkid); |
|
798 pChunk = 0; |
|
799 |
|
800 #ifndef MNG_OPTIMIZE_CHUNKREADER |
|
801 /* determine max index of table */ |
|
802 iTop = (sizeof (mng_chunk_table) / sizeof (mng_chunk_table [0])) - 1; |
|
803 |
|
804 /* binary search; with 54 chunks, worst-case is 7 comparisons */ |
|
805 iLower = 0; |
|
806 #ifndef MNG_NO_DELTA_PNG |
|
807 iMiddle = 11; /* start with the IDAT entry */ |
|
808 #else |
|
809 iMiddle = 8; |
|
810 #endif |
|
811 iUpper = iTop; |
|
812 pEntry = 0; /* no goods yet! */ |
|
813 |
|
814 do /* the binary search itself */ |
|
815 { |
|
816 if (mng_chunk_table [iMiddle].iChunkname < iChunkname) |
|
817 iLower = iMiddle + 1; |
|
818 else if (mng_chunk_table [iMiddle].iChunkname > iChunkname) |
|
819 iUpper = iMiddle - 1; |
|
820 else |
|
821 { |
|
822 pEntry = &mng_chunk_table [iMiddle]; |
|
823 break; |
|
824 } |
|
825 |
|
826 iMiddle = (iLower + iUpper) >> 1; |
|
827 } |
|
828 while (iLower <= iUpper); |
|
829 |
|
830 if (!pEntry) /* unknown chunk ? */ |
|
831 pEntry = &mng_chunk_unknown; /* make it so! */ |
|
832 |
|
833 #else /* MNG_OPTIMIZE_CHUNKREADER */ |
|
834 |
|
835 mng_get_chunkheader (iChunkname, &sEntry); |
|
836 |
|
837 #endif /* MNG_OPTIMIZE_CHUNKREADER */ |
|
838 |
|
839 pData->iChunkname = iChunkname; /* keep track of where we are */ |
|
840 pData->iChunkseq++; |
|
841 |
|
842 #ifndef MNG_OPTIMIZE_CHUNKREADER |
|
843 if (pEntry->fRead) /* read-callback available ? */ |
|
844 { |
|
845 iRetcode = pEntry->fRead (pData, pEntry, iBuflen, (mng_ptr)pBuf, &pChunk); |
|
846 |
|
847 if (!iRetcode) /* everything oke ? */ |
|
848 { /* remember unknown chunk's id */ |
|
849 if ((pChunk) && (pEntry->iChunkname == MNG_UINT_HUH)) |
|
850 ((mng_chunk_headerp)pChunk)->iChunkname = iChunkname; |
|
851 } |
|
852 } |
|
853 #else /* MNG_OPTIMIZE_CHUNKREADER */ |
|
854 if (sEntry.fRead) /* read-callback available ? */ |
|
855 { |
|
856 iRetcode = sEntry.fRead (pData, &sEntry, iBuflen, (mng_ptr)pBuf, &pChunk); |
|
857 |
|
858 #ifndef MNG_OPTIMIZE_CHUNKREADER |
|
859 if (!iRetcode) /* everything oke ? */ |
|
860 { /* remember unknown chunk's id */ |
|
861 if ((pChunk) && (sEntry.iChunkname == MNG_UINT_HUH)) |
|
862 ((mng_chunk_headerp)pChunk)->iChunkname = iChunkname; |
|
863 } |
|
864 #endif |
|
865 } |
|
866 #endif /* MNG_OPTIMIZE_CHUNKREADER */ |
|
867 else |
|
868 iRetcode = MNG_NOERROR; |
|
869 |
|
870 if (pChunk) /* store this chunk ? */ |
|
871 mng_add_chunk (pData, pChunk); /* do it */ |
|
872 |
|
873 #ifdef MNG_INCLUDE_JNG /* implicit EOF ? */ |
|
874 if ((!pData->bHasMHDR) && (!pData->bHasIHDR) && (!pData->bHasJHDR)) |
|
875 #else |
|
876 if ((!pData->bHasMHDR) && (!pData->bHasIHDR)) |
|
877 #endif |
|
878 iRetcode = mng_process_eof (pData);/* then do some EOF processing */ |
|
879 |
|
880 if (iRetcode) /* on error bail out */ |
|
881 return iRetcode; |
|
882 |
|
883 #ifdef MNG_SUPPORT_TRACE |
|
884 MNG_TRACE (pData, MNG_FN_PROCESS_RAW_CHUNK, MNG_LC_END); |
|
885 #endif |
|
886 |
|
887 return MNG_NOERROR; |
|
888 } |
|
889 |
|
890 /* ************************************************************************** */ |
|
891 |
|
892 MNG_LOCAL mng_retcode check_chunk_crc (mng_datap pData, |
|
893 mng_uint8p pBuf, |
|
894 mng_uint32 iBuflen) |
|
895 { |
|
896 mng_uint32 iCrc; /* calculated CRC */ |
|
897 mng_bool bDiscard = MNG_FALSE; |
|
898 mng_retcode iRetcode = MNG_NOERROR; |
|
899 |
|
900 #ifdef MNG_SUPPORT_TRACE |
|
901 MNG_TRACE (pData, MNG_FN_READ_CHUNK_CRC, MNG_LC_START); |
|
902 #endif |
|
903 |
|
904 if (pData->iCrcmode & MNG_CRC_INPUT) /* crc included ? */ |
|
905 { |
|
906 mng_bool bCritical = (mng_bool)((*pBuf & 0x20) == 0); |
|
907 mng_uint32 iL = iBuflen - (mng_uint32)(sizeof (iCrc)); |
|
908 |
|
909 if (((bCritical ) && (pData->iCrcmode & MNG_CRC_CRITICAL )) || |
|
910 ((!bCritical) && (pData->iCrcmode & MNG_CRC_ANCILLARY))) |
|
911 { /* calculate the crc */ |
|
912 iCrc = mng_crc (pData, pBuf, iL); |
|
913 /* and check it */ |
|
914 if (!(iCrc == mng_get_uint32 (pBuf + iL))) |
|
915 { |
|
916 mng_bool bWarning = MNG_FALSE; |
|
917 mng_bool bError = MNG_FALSE; |
|
918 |
|
919 if (bCritical) |
|
920 { |
|
921 switch (pData->iCrcmode & MNG_CRC_CRITICAL) |
|
922 { |
|
923 case MNG_CRC_CRITICAL_WARNING : { bWarning = MNG_TRUE; break; } |
|
924 case MNG_CRC_CRITICAL_ERROR : { bError = MNG_TRUE; break; } |
|
925 } |
|
926 } |
|
927 else |
|
928 { |
|
929 switch (pData->iCrcmode & MNG_CRC_ANCILLARY) |
|
930 { |
|
931 case MNG_CRC_ANCILLARY_DISCARD : { bDiscard = MNG_TRUE; break; } |
|
932 case MNG_CRC_ANCILLARY_WARNING : { bWarning = MNG_TRUE; break; } |
|
933 case MNG_CRC_ANCILLARY_ERROR : { bError = MNG_TRUE; break; } |
|
934 } |
|
935 } |
|
936 |
|
937 if (bWarning) |
|
938 MNG_WARNING (pData, MNG_INVALIDCRC); |
|
939 if (bError) |
|
940 MNG_ERROR (pData, MNG_INVALIDCRC); |
|
941 } |
|
942 } |
|
943 |
|
944 if (!bDiscard) /* still processing ? */ |
|
945 iRetcode = process_raw_chunk (pData, pBuf, iL); |
|
946 } |
|
947 else |
|
948 { /* no crc => straight onto processing */ |
|
949 iRetcode = process_raw_chunk (pData, pBuf, iBuflen); |
|
950 } |
|
951 |
|
952 #ifdef MNG_SUPPORT_TRACE |
|
953 MNG_TRACE (pData, MNG_FN_READ_CHUNK_CRC, MNG_LC_END); |
|
954 #endif |
|
955 |
|
956 return iRetcode; |
|
957 } |
|
958 |
|
959 /* ************************************************************************** */ |
|
960 |
|
961 MNG_LOCAL mng_retcode read_chunk (mng_datap pData) |
|
962 { |
|
963 mng_uint32 iBufmax = pData->iReadbufsize; |
|
964 mng_uint8p pBuf = pData->pReadbuf; |
|
965 mng_uint32 iBuflen = 0; /* number of bytes requested */ |
|
966 mng_uint32 iRead = 0; /* number of bytes read */ |
|
967 mng_retcode iRetcode = MNG_NOERROR; |
|
968 |
|
969 #ifdef MNG_SUPPORT_TRACE |
|
970 MNG_TRACE (pData, MNG_FN_READ_CHUNK, MNG_LC_START); |
|
971 #endif |
|
972 |
|
973 #ifdef MNG_SUPPORT_DISPLAY |
|
974 if (pData->pCurraniobj) /* processing an animation object ? */ |
|
975 { |
|
976 do /* process it then */ |
|
977 { |
|
978 iRetcode = ((mng_object_headerp)pData->pCurraniobj)->fProcess (pData, pData->pCurraniobj); |
|
979 /* refresh needed ? */ |
|
980 /* if ((!iRetcode) && (!pData->bTimerset) && (pData->bNeedrefresh)) |
|
981 iRetcode = display_progressive_refresh (pData, 1); */ |
|
982 /* can we advance to next object ? */ |
|
983 if ((!iRetcode) && (pData->pCurraniobj) && |
|
984 (!pData->bTimerset) && (!pData->bSectionwait)) |
|
985 { /* reset timer indicator on read-cycle */ |
|
986 if ((pData->bReading) && (!pData->bDisplaying)) |
|
987 pData->bTimerset = MNG_FALSE; |
|
988 |
|
989 pData->pCurraniobj = ((mng_object_headerp)pData->pCurraniobj)->pNext; |
|
990 /* TERM processing to be done ? */ |
|
991 if ((!pData->pCurraniobj) && (pData->bHasTERM) && (!pData->bHasMHDR)) |
|
992 iRetcode = mng_process_display_mend (pData); |
|
993 } |
|
994 } /* until error or a break or no more objects */ |
|
995 while ((!iRetcode) && (pData->pCurraniobj) && |
|
996 (!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bFreezing)); |
|
997 } |
|
998 else |
|
999 { |
|
1000 if (pData->iBreakpoint) /* do we need to finish something first ? */ |
|
1001 { |
|
1002 switch (pData->iBreakpoint) /* return to broken display routine */ |
|
1003 { |
|
1004 #ifndef MNG_SKIPCHUNK_FRAM |
|
1005 case 1 : { iRetcode = mng_process_display_fram2 (pData); break; } |
|
1006 #endif |
|
1007 case 2 : { iRetcode = mng_process_display_ihdr (pData); break; } |
|
1008 #ifndef MNG_SKIPCHUNK_SHOW |
|
1009 case 3 : ; /* same as 4 !!! */ |
|
1010 case 4 : { iRetcode = mng_process_display_show (pData); break; } |
|
1011 #endif |
|
1012 #ifndef MNG_SKIPCHUNK_CLON |
|
1013 case 5 : { iRetcode = mng_process_display_clon2 (pData); break; } |
|
1014 #endif |
|
1015 #ifdef MNG_INCLUDE_JNG |
|
1016 case 7 : { iRetcode = mng_process_display_jhdr (pData); break; } |
|
1017 #endif |
|
1018 case 6 : ; /* same as 8 !!! */ |
|
1019 case 8 : { iRetcode = mng_process_display_iend (pData); break; } |
|
1020 #ifndef MNG_SKIPCHUNK_MAGN |
|
1021 case 9 : { iRetcode = mng_process_display_magn2 (pData); break; } |
|
1022 #endif |
|
1023 case 10 : { iRetcode = mng_process_display_mend2 (pData); break; } |
|
1024 #ifndef MNG_SKIPCHUNK_PAST |
|
1025 case 11 : { iRetcode = mng_process_display_past2 (pData); break; } |
|
1026 #endif |
|
1027 } |
|
1028 } |
|
1029 } |
|
1030 |
|
1031 if (iRetcode) /* on error bail out */ |
|
1032 return iRetcode; |
|
1033 |
|
1034 #endif /* MNG_SUPPORT_DISPLAY */ |
|
1035 /* can we continue processing now, or do we */ |
|
1036 /* need to wait for the timer to finish (again) ? */ |
|
1037 #ifdef MNG_SUPPORT_DISPLAY |
|
1038 if ((!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bEOF)) |
|
1039 #else |
|
1040 if (!pData->bEOF) |
|
1041 #endif |
|
1042 { |
|
1043 #ifdef MNG_SUPPORT_DISPLAY |
|
1044 /* freezing in progress ? */ |
|
1045 if ((pData->bFreezing) && (pData->iSuspendpoint == 0)) |
|
1046 pData->bRunning = MNG_FALSE; /* then this is the right moment to do it */ |
|
1047 #endif |
|
1048 |
|
1049 if (pData->iSuspendpoint <= 2) |
|
1050 { |
|
1051 iBuflen = sizeof (mng_uint32); /* read length */ |
|
1052 iRetcode = read_databuffer (pData, pBuf, &pData->pReadbufnext, iBuflen, &iRead); |
|
1053 |
|
1054 if (iRetcode) /* bail on errors */ |
|
1055 return iRetcode; |
|
1056 |
|
1057 if (pData->bSuspended) /* suspended ? */ |
|
1058 pData->iSuspendpoint = 2; |
|
1059 else /* save the length */ |
|
1060 { |
|
1061 pData->iChunklen = mng_get_uint32 (pBuf); |
|
1062 if (pData->iChunklen > 0x7ffffff) |
|
1063 return MNG_INVALIDLENGTH; |
|
1064 } |
|
1065 |
|
1066 } |
|
1067 |
|
1068 if (!pData->bSuspended) /* still going ? */ |
|
1069 { /* previously suspended or not eof ? */ |
|
1070 if ((pData->iSuspendpoint > 2) || (iRead == iBuflen)) |
|
1071 { /* determine length chunkname + data (+ crc) */ |
|
1072 if (pData->iCrcmode & MNG_CRC_INPUT) |
|
1073 iBuflen = pData->iChunklen + (mng_uint32)(sizeof (mng_chunkid) + sizeof (mng_uint32)); |
|
1074 else |
|
1075 iBuflen = pData->iChunklen + (mng_uint32)(sizeof (mng_chunkid)); |
|
1076 |
|
1077 /* do we have enough data in the current push buffer ? */ |
|
1078 if ((pData->pFirstpushdata) && (iBuflen <= pData->pFirstpushdata->iRemaining)) |
|
1079 { |
|
1080 mng_pushdatap pPush = pData->pFirstpushdata; |
|
1081 pBuf = pPush->pDatanext; |
|
1082 pPush->pDatanext += iBuflen; |
|
1083 pPush->iRemaining -= iBuflen; |
|
1084 pData->iSuspendpoint = 0; /* safely reset this here ! */ |
|
1085 |
|
1086 iRetcode = check_chunk_crc (pData, pBuf, iBuflen); |
|
1087 if (iRetcode) |
|
1088 return iRetcode; |
|
1089 |
|
1090 if (!pPush->iRemaining) /* buffer depleted? then release it */ |
|
1091 iRetcode = mng_release_pushdata (pData); |
|
1092 } |
|
1093 else |
|
1094 { |
|
1095 if (iBuflen < iBufmax) /* does it fit in default buffer ? */ |
|
1096 { /* note that we don't use the full size |
|
1097 so there's always a zero-byte at the |
|
1098 very end !!! */ |
|
1099 iRetcode = read_databuffer (pData, pBuf, &pData->pReadbufnext, iBuflen, &iRead); |
|
1100 if (iRetcode) /* bail on errors */ |
|
1101 return iRetcode; |
|
1102 |
|
1103 if (pData->bSuspended) /* suspended ? */ |
|
1104 pData->iSuspendpoint = 3; |
|
1105 else |
|
1106 { |
|
1107 if (iRead != iBuflen) /* did we get all the data ? */ |
|
1108 MNG_ERROR (pData, MNG_UNEXPECTEDEOF); |
|
1109 iRetcode = check_chunk_crc (pData, pBuf, iBuflen); |
|
1110 } |
|
1111 } |
|
1112 else |
|
1113 { |
|
1114 if (iBuflen > 16777216) /* is the length incredible? */ |
|
1115 MNG_ERROR (pData, MNG_IMPROBABLELENGTH); |
|
1116 |
|
1117 if (!pData->iSuspendpoint) /* create additional large buffer ? */ |
|
1118 { /* again reserve space for the last zero-byte */ |
|
1119 pData->iLargebufsize = iBuflen + 1; |
|
1120 pData->pLargebufnext = MNG_NULL; |
|
1121 MNG_ALLOC (pData, pData->pLargebuf, pData->iLargebufsize); |
|
1122 } |
|
1123 |
|
1124 iRetcode = read_databuffer (pData, pData->pLargebuf, &pData->pLargebufnext, iBuflen, &iRead); |
|
1125 if (iRetcode) |
|
1126 return iRetcode; |
|
1127 |
|
1128 if (pData->bSuspended) /* suspended ? */ |
|
1129 pData->iSuspendpoint = 4; |
|
1130 else |
|
1131 { |
|
1132 if (iRead != iBuflen) /* did we get all the data ? */ |
|
1133 MNG_ERROR (pData, MNG_UNEXPECTEDEOF); |
|
1134 iRetcode = check_chunk_crc (pData, pData->pLargebuf, iBuflen); |
|
1135 /* cleanup additional large buffer */ |
|
1136 MNG_FREE (pData, pData->pLargebuf, pData->iLargebufsize); |
|
1137 } |
|
1138 } |
|
1139 } |
|
1140 |
|
1141 if (iRetcode) /* on error bail out */ |
|
1142 return iRetcode; |
|
1143 |
|
1144 } |
|
1145 else |
|
1146 { /* that's final */ |
|
1147 iRetcode = mng_process_eof (pData); |
|
1148 |
|
1149 if (iRetcode) /* on error bail out */ |
|
1150 return iRetcode; |
|
1151 |
|
1152 if ((iRead != 0) || /* did we get an unexpected eof ? */ |
|
1153 #ifdef MNG_INCLUDE_JNG |
|
1154 (pData->bHasIHDR || pData->bHasMHDR || pData->bHasJHDR)) |
|
1155 #else |
|
1156 (pData->bHasIHDR || pData->bHasMHDR)) |
|
1157 #endif |
|
1158 MNG_ERROR (pData, MNG_UNEXPECTEDEOF); |
|
1159 } |
|
1160 } |
|
1161 } |
|
1162 |
|
1163 #ifdef MNG_SUPPORT_DISPLAY /* refresh needed ? */ |
|
1164 if ((!pData->bTimerset) && (!pData->bSuspended) && (pData->bNeedrefresh)) |
|
1165 { |
|
1166 iRetcode = mng_display_progressive_refresh (pData, 1); |
|
1167 |
|
1168 if (iRetcode) /* on error bail out */ |
|
1169 return iRetcode; |
|
1170 } |
|
1171 #endif |
|
1172 |
|
1173 #ifdef MNG_SUPPORT_TRACE |
|
1174 MNG_TRACE (pData, MNG_FN_READ_CHUNK, MNG_LC_END); |
|
1175 #endif |
|
1176 |
|
1177 return MNG_NOERROR; |
|
1178 } |
|
1179 |
|
1180 /* ************************************************************************** */ |
|
1181 |
|
1182 MNG_LOCAL mng_retcode process_pushedchunk (mng_datap pData) |
|
1183 { |
|
1184 mng_pushdatap pPush; |
|
1185 mng_retcode iRetcode = MNG_NOERROR; |
|
1186 |
|
1187 #ifdef MNG_SUPPORT_DISPLAY |
|
1188 if (pData->pCurraniobj) /* processing an animation object ? */ |
|
1189 { |
|
1190 do /* process it then */ |
|
1191 { |
|
1192 iRetcode = ((mng_object_headerp)pData->pCurraniobj)->fProcess (pData, pData->pCurraniobj); |
|
1193 /* refresh needed ? */ |
|
1194 /* if ((!iRetcode) && (!pData->bTimerset) && (pData->bNeedrefresh)) |
|
1195 iRetcode = display_progressive_refresh (pData, 1); */ |
|
1196 /* can we advance to next object ? */ |
|
1197 if ((!iRetcode) && (pData->pCurraniobj) && |
|
1198 (!pData->bTimerset) && (!pData->bSectionwait)) |
|
1199 { /* reset timer indicator on read-cycle */ |
|
1200 if ((pData->bReading) && (!pData->bDisplaying)) |
|
1201 pData->bTimerset = MNG_FALSE; |
|
1202 |
|
1203 pData->pCurraniobj = ((mng_object_headerp)pData->pCurraniobj)->pNext; |
|
1204 /* TERM processing to be done ? */ |
|
1205 if ((!pData->pCurraniobj) && (pData->bHasTERM) && (!pData->bHasMHDR)) |
|
1206 iRetcode = mng_process_display_mend (pData); |
|
1207 } |
|
1208 } /* until error or a break or no more objects */ |
|
1209 while ((!iRetcode) && (pData->pCurraniobj) && |
|
1210 (!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bFreezing)); |
|
1211 } |
|
1212 else |
|
1213 { |
|
1214 if (pData->iBreakpoint) /* do we need to finish something first ? */ |
|
1215 { |
|
1216 switch (pData->iBreakpoint) /* return to broken display routine */ |
|
1217 { |
|
1218 #ifndef MNG_SKIPCHUNK_FRAM |
|
1219 case 1 : { iRetcode = mng_process_display_fram2 (pData); break; } |
|
1220 #endif |
|
1221 case 2 : { iRetcode = mng_process_display_ihdr (pData); break; } |
|
1222 #ifndef MNG_SKIPCHUNK_SHOW |
|
1223 case 3 : ; /* same as 4 !!! */ |
|
1224 case 4 : { iRetcode = mng_process_display_show (pData); break; } |
|
1225 #endif |
|
1226 #ifndef MNG_SKIPCHUNK_CLON |
|
1227 case 5 : { iRetcode = mng_process_display_clon2 (pData); break; } |
|
1228 #endif |
|
1229 #ifdef MNG_INCLUDE_JNG |
|
1230 case 7 : { iRetcode = mng_process_display_jhdr (pData); break; } |
|
1231 #endif |
|
1232 case 6 : ; /* same as 8 !!! */ |
|
1233 case 8 : { iRetcode = mng_process_display_iend (pData); break; } |
|
1234 #ifndef MNG_SKIPCHUNK_MAGN |
|
1235 case 9 : { iRetcode = mng_process_display_magn2 (pData); break; } |
|
1236 #endif |
|
1237 case 10 : { iRetcode = mng_process_display_mend2 (pData); break; } |
|
1238 #ifndef MNG_SKIPCHUNK_PAST |
|
1239 case 11 : { iRetcode = mng_process_display_past2 (pData); break; } |
|
1240 #endif |
|
1241 } |
|
1242 } |
|
1243 } |
|
1244 |
|
1245 if (iRetcode) /* on error bail out */ |
|
1246 return iRetcode; |
|
1247 |
|
1248 #endif /* MNG_SUPPORT_DISPLAY */ |
|
1249 /* can we continue processing now, or do we */ |
|
1250 /* need to wait for the timer to finish (again) ? */ |
|
1251 #ifdef MNG_SUPPORT_DISPLAY |
|
1252 if ((!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bEOF)) |
|
1253 #else |
|
1254 if (!pData->bEOF) |
|
1255 #endif |
|
1256 { |
|
1257 pData->iSuspendpoint = 0; /* safely reset it here ! */ |
|
1258 pPush = pData->pFirstpushchunk; |
|
1259 |
|
1260 iRetcode = process_raw_chunk (pData, pPush->pData, pPush->iLength); |
|
1261 if (iRetcode) |
|
1262 return iRetcode; |
|
1263 |
|
1264 #ifdef MNG_SUPPORT_DISPLAY /* refresh needed ? */ |
|
1265 if ((!pData->bTimerset) && (!pData->bSuspended) && (pData->bNeedrefresh)) |
|
1266 { |
|
1267 iRetcode = mng_display_progressive_refresh (pData, 1); |
|
1268 if (iRetcode) /* on error bail out */ |
|
1269 return iRetcode; |
|
1270 } |
|
1271 #endif |
|
1272 } |
|
1273 |
|
1274 return mng_release_pushchunk (pData); |
|
1275 } |
|
1276 |
|
1277 /* ************************************************************************** */ |
|
1278 |
|
1279 mng_retcode mng_read_graphic (mng_datap pData) |
|
1280 { |
|
1281 mng_uint32 iBuflen; /* number of bytes requested */ |
|
1282 mng_uint32 iRead; /* number of bytes read */ |
|
1283 mng_retcode iRetcode; /* temporary error-code */ |
|
1284 |
|
1285 #ifdef MNG_SUPPORT_TRACE |
|
1286 MNG_TRACE (pData, MNG_FN_READ_GRAPHIC, MNG_LC_START); |
|
1287 #endif |
|
1288 |
|
1289 if (!pData->pReadbuf) /* buffer allocated ? */ |
|
1290 { |
|
1291 pData->iReadbufsize = 4200; /* allocate a default read buffer */ |
|
1292 MNG_ALLOC (pData, pData->pReadbuf, pData->iReadbufsize); |
|
1293 } |
|
1294 /* haven't processed the signature ? */ |
|
1295 if ((!pData->bHavesig) || (pData->iSuspendpoint == 1)) |
|
1296 { |
|
1297 iBuflen = 2 * sizeof (mng_uint32); /* read signature */ |
|
1298 |
|
1299 iRetcode = read_databuffer (pData, pData->pReadbuf, &pData->pReadbufnext, iBuflen, &iRead); |
|
1300 |
|
1301 if (iRetcode) |
|
1302 return iRetcode; |
|
1303 |
|
1304 if (pData->bSuspended) /* input suspension ? */ |
|
1305 pData->iSuspendpoint = 1; |
|
1306 else |
|
1307 { |
|
1308 if (iRead != iBuflen) /* full signature received ? */ |
|
1309 MNG_ERROR (pData, MNG_UNEXPECTEDEOF); |
|
1310 /* is it a valid signature ? */ |
|
1311 if (mng_get_uint32 (pData->pReadbuf) == PNG_SIG) |
|
1312 pData->eSigtype = mng_it_png; |
|
1313 else |
|
1314 #ifdef MNG_INCLUDE_JNG |
|
1315 if (mng_get_uint32 (pData->pReadbuf) == JNG_SIG) |
|
1316 pData->eSigtype = mng_it_jng; |
|
1317 else |
|
1318 #endif |
|
1319 if (mng_get_uint32 (pData->pReadbuf) == MNG_SIG) |
|
1320 pData->eSigtype = mng_it_mng; |
|
1321 else |
|
1322 MNG_ERROR (pData, MNG_INVALIDSIG); |
|
1323 /* all of it ? */ |
|
1324 if (mng_get_uint32 (pData->pReadbuf+4) != POST_SIG) |
|
1325 MNG_ERROR (pData, MNG_INVALIDSIG); |
|
1326 |
|
1327 pData->bHavesig = MNG_TRUE; |
|
1328 } |
|
1329 } |
|
1330 |
|
1331 if (!pData->bSuspended) /* still going ? */ |
|
1332 { |
|
1333 do |
|
1334 { /* reset timer during mng_read() ? */ |
|
1335 if ((pData->bReading) && (!pData->bDisplaying)) |
|
1336 pData->bTimerset = MNG_FALSE; |
|
1337 |
|
1338 if (pData->pFirstpushchunk) /* chunks pushed ? */ |
|
1339 iRetcode = process_pushedchunk (pData); /* process the pushed chunk */ |
|
1340 else |
|
1341 iRetcode = read_chunk (pData); /* read & process a chunk */ |
|
1342 |
|
1343 if (iRetcode) /* on error bail out */ |
|
1344 return iRetcode; |
|
1345 } |
|
1346 #ifdef MNG_SUPPORT_DISPLAY /* until EOF or a break-request */ |
|
1347 while (((!pData->bEOF) || (pData->pCurraniobj)) && |
|
1348 (!pData->bSuspended) && (!pData->bSectionwait) && |
|
1349 ((!pData->bTimerset) || ((pData->bReading) && (!pData->bDisplaying)))); |
|
1350 #else |
|
1351 while ((!pData->bEOF) && (!pData->bSuspended)); |
|
1352 #endif |
|
1353 } |
|
1354 |
|
1355 #ifdef MNG_SUPPORT_TRACE |
|
1356 MNG_TRACE (pData, MNG_FN_READ_GRAPHIC, MNG_LC_END); |
|
1357 #endif |
|
1358 |
|
1359 return MNG_NOERROR; |
|
1360 } |
|
1361 |
|
1362 /* ************************************************************************** */ |
|
1363 |
|
1364 #endif /* MNG_INCLUDE_READ_PROCS */ |
|
1365 |
|
1366 /* ************************************************************************** */ |
|
1367 /* * end of file * */ |
|
1368 /* ************************************************************************** */ |
|
1369 |