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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_write.c copyright (c) 2000-2004 G.Juyn * */ |
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8 /* * version : 1.0.9 * */ |
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9 /* * * */ |
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10 /* * purpose : Write management (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 write management routines * */ |
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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 - 05/12/2000 - G.Juyn * */ |
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19 /* * - changed trace to macro for callback error-reporting * */ |
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20 /* * 0.5.1 - 05/16/2000 - G.Juyn * */ |
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21 /* * - moved the actual write_graphic functionality from * */ |
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22 /* * mng_hlapi to its appropriate function here * */ |
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23 /* * * */ |
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24 /* * 0.9.1 - 07/19/2000 - G.Juyn * */ |
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25 /* * - fixed writing of signature * */ |
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26 /* * * */ |
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27 /* * 0.9.2 - 08/05/2000 - G.Juyn * */ |
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28 /* * - changed file-prefixes * */ |
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29 /* * * */ |
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30 /* * 1.0.5 - 08/19/2002 - G.Juyn * */ |
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31 /* * - B597134 - libmng pollutes the linker namespace * */ |
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32 /* * * */ |
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33 /* * 1.0.8 - 07/06/2004 - G.R-P * */ |
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34 /* * - added conditionals around openstream/closestream * */ |
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35 /* * - defend against using undefined Open/Closestream function * */ |
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36 /* * 1.0.8 - 08/02/2004 - G.Juyn * */ |
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37 /* * - added conditional to allow easier writing of large MNG's * */ |
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38 /* * * */ |
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39 /* * 1.0.9 - 09/25/2004 - G.Juyn * */ |
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40 /* * - replaced MNG_TWEAK_LARGE_FILES with permanent solution * */ |
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41 /* * 1.0.9 - 12/20/2004 - G.Juyn * */ |
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42 /* * - cleaned up macro-invocations (thanks to D. Airlie) * */ |
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43 /* * * */ |
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44 /* ************************************************************************** */ |
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45 |
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46 #include "libmng.h" |
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47 #include "libmng_data.h" |
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48 #include "libmng_error.h" |
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49 #include "libmng_trace.h" |
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50 #ifdef __BORLANDC__ |
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51 #pragma hdrstop |
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52 #endif |
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53 #include "libmng_memory.h" |
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54 #include "libmng_chunks.h" |
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55 #include "libmng_chunk_io.h" |
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56 #include "libmng_write.h" |
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57 |
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58 #if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI) |
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59 #pragma option -A /* force ANSI-C */ |
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60 #endif |
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61 |
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62 /* ************************************************************************** */ |
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63 |
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64 #if defined(MNG_SUPPORT_READ) || defined(MNG_SUPPORT_WRITE) |
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65 mng_retcode mng_drop_chunks (mng_datap pData) |
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66 { |
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67 mng_chunkp pChunk; |
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68 mng_chunkp pNext; |
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69 mng_cleanupchunk fCleanup; |
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70 |
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71 #ifdef MNG_SUPPORT_TRACE |
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72 MNG_TRACE (pData, MNG_FN_DROP_CHUNKS, MNG_LC_START); |
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73 #endif |
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74 |
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75 pChunk = pData->pFirstchunk; /* and get first stored chunk (if any) */ |
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76 |
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77 while (pChunk) /* more chunks to discard ? */ |
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78 { |
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79 pNext = ((mng_chunk_headerp)pChunk)->pNext; |
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80 /* call appropriate cleanup */ |
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81 fCleanup = ((mng_chunk_headerp)pChunk)->fCleanup; |
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82 fCleanup (pData, pChunk); |
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83 |
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84 pChunk = pNext; /* neeeext */ |
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85 } |
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86 |
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87 pData->pFirstchunk = MNG_NULL; |
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88 pData->pLastchunk = MNG_NULL; |
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89 |
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90 #ifdef MNG_SUPPORT_TRACE |
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91 MNG_TRACE (pData, MNG_FN_DROP_CHUNKS, MNG_LC_END); |
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92 #endif |
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93 |
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94 return MNG_NOERROR; |
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95 } |
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96 #endif /* MNG_SUPPORT_READ || MNG_SUPPORT_WRITE */ |
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97 |
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98 /* ************************************************************************** */ |
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99 |
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100 #ifdef MNG_INCLUDE_WRITE_PROCS |
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101 |
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102 /* ************************************************************************** */ |
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103 |
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104 mng_retcode mng_write_graphic (mng_datap pData) |
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105 { |
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106 mng_chunkp pChunk; |
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107 mng_retcode iRetcode; |
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108 mng_uint32 iWritten; |
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109 |
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110 #ifdef MNG_SUPPORT_TRACE |
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111 MNG_TRACE (pData, MNG_FN_WRITE_GRAPHIC, MNG_LC_START); |
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112 #endif |
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113 |
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114 pChunk = pData->pFirstchunk; /* we'll start with the first, thank you */ |
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115 |
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116 if (pChunk) /* is there anything to write ? */ |
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117 { /* open the file */ |
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118 if (!pData->bWriting) |
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119 { |
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120 #ifndef MNG_NO_OPEN_CLOSE_STREAM |
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121 if (pData->fOpenstream && !pData->fOpenstream ((mng_handle)pData)) |
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122 MNG_ERROR (pData, MNG_APPIOERROR); |
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123 #endif |
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124 { |
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125 pData->bWriting = MNG_TRUE; /* indicate writing */ |
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126 pData->iWritebufsize = 32768; /* get a temporary write buffer */ |
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127 /* reserve 12 bytes for length, chunkname & crc */ |
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128 MNG_ALLOC (pData, pData->pWritebuf, pData->iWritebufsize+12); |
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129 |
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130 /* write the signature */ |
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131 if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_IHDR) |
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132 mng_put_uint32 (pData->pWritebuf, PNG_SIG); |
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133 else |
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134 if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_JHDR) |
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135 mng_put_uint32 (pData->pWritebuf, JNG_SIG); |
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136 else |
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137 mng_put_uint32 (pData->pWritebuf, MNG_SIG); |
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138 |
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139 mng_put_uint32 (pData->pWritebuf+4, POST_SIG); |
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140 |
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141 if (!pData->fWritedata ((mng_handle)pData, pData->pWritebuf, 8, &iWritten)) |
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142 { |
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143 MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12); |
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144 MNG_ERROR (pData, MNG_APPIOERROR); |
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145 } |
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146 |
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147 if (iWritten != 8) /* disk full ? */ |
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148 { |
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149 MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12); |
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150 MNG_ERROR (pData, MNG_OUTPUTERROR); |
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151 } |
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152 } |
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153 } |
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154 |
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155 while (pChunk) /* so long as there's something to write */ |
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156 { /* let's call its output routine */ |
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157 iRetcode = ((mng_chunk_headerp)pChunk)->fWrite (pData, pChunk); |
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158 if (iRetcode) /* on error bail out */ |
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159 return iRetcode; |
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160 /* neeeext */ |
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161 pChunk = ((mng_chunk_headerp)pChunk)->pNext; |
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162 } |
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163 |
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164 if (!pData->bCreating) |
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165 { /* free the temporary buffer */ |
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166 MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12); |
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167 |
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168 pData->bWriting = MNG_FALSE; /* done writing */ |
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169 /* close the stream now */ |
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170 #ifndef MNG_NO_OPEN_CLOSE_STREAM |
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171 if (pData->fClosestream && !pData->fClosestream ((mng_handle)pData)) |
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172 MNG_ERROR (pData, MNG_APPIOERROR); |
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173 #endif |
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174 |
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175 } else { |
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176 /* cleanup the written chunks */ |
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177 iRetcode = mng_drop_chunks (pData); |
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178 if (iRetcode) /* on error bail out */ |
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179 return iRetcode; |
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180 } |
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181 } |
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182 |
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183 #ifdef MNG_SUPPORT_TRACE |
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184 MNG_TRACE (pData, MNG_FN_WRITE_GRAPHIC, MNG_LC_END); |
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185 #endif |
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186 |
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187 return MNG_NOERROR; |
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188 } |
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189 |
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190 /* ************************************************************************** */ |
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191 |
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192 #endif /* MNG_INCLUDE_WRITE_PROCS */ |
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193 |
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194 /* ************************************************************************** */ |
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195 /* * end of file * */ |
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196 /* ************************************************************************** */ |
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197 |
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198 |