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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_jpeg.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 : JPEG library interface (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 JPEG library interface * */ |
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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 /* * * */ |
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19 /* * 0.5.2 - 05/22/2000 - G.Juyn * */ |
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20 /* * - implemented all the JNG routines * */ |
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21 /* * * */ |
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22 /* * 0.5.3 - 06/17/2000 - G.Juyn * */ |
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23 /* * - added tracing of JPEG calls * */ |
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24 /* * 0.5.3 - 06/24/2000 - G.Juyn * */ |
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25 /* * - fixed inclusion of IJG read/write code * */ |
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26 /* * 0.5.3 - 06/29/2000 - G.Juyn * */ |
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27 /* * - fixed some 64-bit warnings * */ |
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28 /* * * */ |
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29 /* * 0.9.2 - 08/05/2000 - G.Juyn * */ |
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30 /* * - changed file-prefixes * */ |
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31 /* * * */ |
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32 /* * 0.9.3 - 10/16/2000 - G.Juyn * */ |
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33 /* * - added support for JDAA * */ |
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34 /* * * */ |
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35 /* * 1.0.1 - 04/19/2001 - G.Juyn * */ |
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36 /* * - added export of JPEG functions for DLL * */ |
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37 /* * 1.0.1 - 04/22/2001 - G.Juyn * */ |
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38 /* * - fixed memory-leaks (Thanks Gregg!) * */ |
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39 /* * * */ |
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40 /* * 1.0.4 - 06/22/2002 - G.Juyn * */ |
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41 /* * - B526138 - returned IJGSRC6B calling convention to * */ |
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42 /* * default for MSVC * */ |
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43 /* * * */ |
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44 /* * 1.0.5 - 24/02/2003 - G.Juyn * */ |
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45 /* * - B683152 - libjpeg suspension not always honored correctly* */ |
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46 /* * * */ |
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47 /* * 1.0.6 - 03/04/2003 - G.Juyn * */ |
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48 /* * - fixed some compiler-warnings * */ |
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49 /* * * */ |
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50 /* * 1.0.8 - 08/01/2004 - G.Juyn * */ |
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51 /* * - added support for 3+byte pixelsize for JPEG's * */ |
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52 /* * * */ |
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53 /* * 1.0.9 - 12/20/2004 - G.Juyn * */ |
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54 /* * - cleaned up macro-invocations (thanks to D. Airlie) * */ |
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55 /* * * */ |
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56 /* ************************************************************************** */ |
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57 |
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58 #include "libmng.h" |
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59 #include "libmng_data.h" |
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60 #include "libmng_error.h" |
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61 #include "libmng_trace.h" |
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62 #ifdef __BORLANDC__ |
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63 #pragma hdrstop |
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64 #endif |
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65 #include "libmng_memory.h" |
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66 #include "libmng_pixels.h" |
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67 #include "libmng_jpeg.h" |
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68 |
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69 #if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI) |
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70 #pragma option -A /* force ANSI-C */ |
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71 #endif |
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72 |
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73 /* ************************************************************************** */ |
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74 |
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75 #if defined(MNG_INCLUDE_JNG) && defined(MNG_INCLUDE_DISPLAY_PROCS) |
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76 |
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77 /* ************************************************************************** */ |
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78 /* * * */ |
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79 /* * Local IJG callback routines (source-manager, error-manager and such) * */ |
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80 /* * * */ |
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81 /* ************************************************************************** */ |
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82 |
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83 #ifdef MNG_INCLUDE_IJG6B |
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84 |
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85 /* ************************************************************************** */ |
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86 |
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87 #ifdef MNG_INCLUDE_JNG_READ |
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88 #ifdef MNG_DEFINE_JPEG_STDCALL |
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89 void MNG_DECL mng_init_source (j_decompress_ptr cinfo) |
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90 #else |
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91 void mng_init_source (j_decompress_ptr cinfo) |
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92 #endif |
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93 { |
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94 return; /* nothing needed */ |
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95 } |
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96 #endif /* MNG_INCLUDE_JNG_READ */ |
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97 |
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98 /* ************************************************************************** */ |
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99 |
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100 #ifdef MNG_INCLUDE_JNG_READ |
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101 #ifdef MNG_DEFINE_JPEG_STDCALL |
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102 boolean MNG_DECL mng_fill_input_buffer (j_decompress_ptr cinfo) |
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103 #else |
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104 boolean mng_fill_input_buffer (j_decompress_ptr cinfo) |
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105 #endif |
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106 { |
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107 return FALSE; /* force IJG routine to return to caller */ |
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108 } |
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109 #endif /* MNG_INCLUDE_JNG_READ */ |
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110 |
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111 /* ************************************************************************** */ |
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112 |
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113 #ifdef MNG_INCLUDE_JNG_READ |
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114 #ifdef MNG_DEFINE_JPEG_STDCALL |
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115 void MNG_DECL mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes) |
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116 #else |
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117 void mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes) |
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118 #endif |
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119 { |
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120 if (num_bytes > 0) /* ignore fony calls */ |
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121 { /* address my generic structure */ |
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122 mng_datap pData = (mng_datap)cinfo->client_data; |
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123 /* address source manager */ |
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124 mngjpeg_sourcep pSrc = pData->pJPEGdinfo->src; |
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125 /* problem scenario ? */ |
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126 if (pSrc->bytes_in_buffer < (size_t)num_bytes) |
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127 { /* tell the boss we need to skip some data! */ |
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128 pData->iJPEGtoskip = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer); |
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129 |
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130 pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */ |
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131 pSrc->next_input_byte = MNG_NULL; |
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132 } |
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133 else |
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134 { /* simply advance in the buffer */ |
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135 pSrc->bytes_in_buffer -= num_bytes; |
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136 pSrc->next_input_byte += num_bytes; |
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137 } |
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138 } |
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139 |
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140 return; |
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141 } |
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142 #endif /* MNG_INCLUDE_JNG_READ */ |
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143 |
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144 /* ************************************************************************** */ |
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145 |
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146 #ifdef MNG_INCLUDE_JNG_READ |
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147 #ifdef MNG_DEFINE_JPEG_STDCALL |
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148 void MNG_DECL mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes) |
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149 #else |
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150 void mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes) |
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151 #endif |
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152 { |
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153 if (num_bytes > 0) /* ignore fony calls */ |
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154 { /* address my generic structure */ |
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155 mng_datap pData = (mng_datap)cinfo->client_data; |
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156 /* address source manager */ |
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157 mngjpeg_sourcep pSrc = pData->pJPEGdinfo2->src; |
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158 /* problem scenario ? */ |
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159 if (pSrc->bytes_in_buffer < (size_t)num_bytes) |
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160 { /* tell the boss we need to skip some data! */ |
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161 pData->iJPEGtoskip2 = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer); |
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162 |
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163 pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */ |
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164 pSrc->next_input_byte = MNG_NULL; |
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165 } |
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166 else |
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167 { /* simply advance in the buffer */ |
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168 pSrc->bytes_in_buffer -= num_bytes; |
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169 pSrc->next_input_byte += num_bytes; |
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170 } |
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171 } |
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172 |
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173 return; |
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174 } |
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175 #endif /* MNG_INCLUDE_JNG_READ */ |
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176 |
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177 /* ************************************************************************** */ |
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178 |
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179 #ifdef MNG_INCLUDE_JNG_READ |
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180 #ifdef MNG_DEFINE_JPEG_STDCALL |
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181 void MNG_DECL mng_term_source (j_decompress_ptr cinfo) |
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182 #else |
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183 void mng_term_source (j_decompress_ptr cinfo) |
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184 #endif |
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185 { |
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186 return; /* nothing needed */ |
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187 } |
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188 #endif /* MNG_INCLUDE_JNG_READ */ |
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189 |
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190 /* ************************************************************************** */ |
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191 |
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192 #ifdef MNG_USE_SETJMP |
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193 #ifdef MNG_DEFINE_JPEG_STDCALL |
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194 void MNG_DECL mng_error_exit (j_common_ptr cinfo) |
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195 #else |
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196 void mng_error_exit (j_common_ptr cinfo) |
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197 #endif |
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198 { /* address my generic structure */ |
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199 mng_datap pData = (mng_datap)cinfo->client_data; |
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200 |
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201 #ifdef MNG_ERROR_TELLTALE /* fill the message text ??? */ |
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202 (*cinfo->err->output_message) (cinfo); |
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203 #endif |
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204 /* return to the point of no return... */ |
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205 longjmp (pData->sErrorbuf, cinfo->err->msg_code); |
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206 } |
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207 #endif /* MNG_USE_SETJMP */ |
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208 |
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209 /* ************************************************************************** */ |
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210 |
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211 #ifdef MNG_USE_SETJMP |
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212 #ifdef MNG_DEFINE_JPEG_STDCALL |
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213 void MNG_DECL mng_output_message (j_common_ptr cinfo) |
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214 #else |
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215 void mng_output_message (j_common_ptr cinfo) |
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216 #endif |
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217 { |
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218 return; /* just do nothing ! */ |
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219 } |
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220 #endif /* MNG_USE_SETJMP */ |
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221 |
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222 /* ************************************************************************** */ |
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223 |
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224 #endif /* MNG_INCLUDE_IJG6B */ |
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225 |
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226 /* ************************************************************************** */ |
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227 /* * * */ |
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228 /* * Global JPEG routines * */ |
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229 /* * * */ |
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230 /* ************************************************************************** */ |
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231 |
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232 mng_retcode mngjpeg_initialize (mng_datap pData) |
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233 { |
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234 #ifdef MNG_SUPPORT_TRACE |
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235 MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_START); |
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236 #endif |
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237 /* allocate space for JPEG structures if necessary */ |
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238 #ifdef MNG_INCLUDE_JNG_READ |
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239 if (pData->pJPEGderr == MNG_NULL) |
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240 MNG_ALLOC (pData, pData->pJPEGderr, sizeof (mngjpeg_error )); |
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241 if (pData->pJPEGdsrc == MNG_NULL) |
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242 MNG_ALLOC (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source)); |
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243 if (pData->pJPEGdinfo == MNG_NULL) |
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244 MNG_ALLOC (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp)); |
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245 /* enable reverse addressing */ |
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246 pData->pJPEGdinfo->client_data = pData; |
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247 |
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248 if (pData->pJPEGderr2 == MNG_NULL) |
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249 MNG_ALLOC (pData, pData->pJPEGderr2, sizeof (mngjpeg_error )); |
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250 if (pData->pJPEGdsrc2 == MNG_NULL) |
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251 MNG_ALLOC (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source)); |
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252 if (pData->pJPEGdinfo2 == MNG_NULL) |
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253 MNG_ALLOC (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp)); |
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254 /* enable reverse addressing */ |
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255 pData->pJPEGdinfo2->client_data = pData; |
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256 #endif |
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257 |
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258 #ifdef MNG_INCLUDE_JNG_WRITE |
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259 if (pData->pJPEGcerr == MNG_NULL) |
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260 MNG_ALLOC (pData, pData->pJPEGcerr, sizeof (mngjpeg_error )); |
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261 if (pData->pJPEGcinfo == MNG_NULL) |
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262 MNG_ALLOC (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp )); |
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263 /* enable reverse addressing */ |
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264 pData->pJPEGcinfo->client_data = pData; |
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265 #endif |
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266 |
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267 if (pData->pJPEGbuf == MNG_NULL) /* initialize temporary buffers */ |
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268 { |
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269 pData->iJPEGbufmax = MNG_JPEG_MAXBUF; |
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270 MNG_ALLOC (pData, pData->pJPEGbuf, pData->iJPEGbufmax); |
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271 } |
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272 |
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273 if (pData->pJPEGbuf2 == MNG_NULL) |
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274 { |
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275 pData->iJPEGbufmax2 = MNG_JPEG_MAXBUF; |
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276 MNG_ALLOC (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2); |
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277 } |
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278 |
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279 pData->pJPEGcurrent = pData->pJPEGbuf; |
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280 pData->iJPEGbufremain = 0; |
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281 pData->pJPEGrow = MNG_NULL; |
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282 pData->iJPEGrowlen = 0; |
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283 pData->iJPEGtoskip = 0; |
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284 |
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285 pData->pJPEGcurrent2 = pData->pJPEGbuf2; |
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286 pData->iJPEGbufremain2 = 0; |
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287 pData->pJPEGrow2 = MNG_NULL; |
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288 pData->iJPEGrowlen2 = 0; |
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289 pData->iJPEGtoskip2 = 0; |
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290 /* not doing anything yet ! */ |
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291 pData->bJPEGcompress = MNG_FALSE; |
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292 |
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293 pData->bJPEGdecompress = MNG_FALSE; |
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294 pData->bJPEGhasheader = MNG_FALSE; |
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295 pData->bJPEGdecostarted = MNG_FALSE; |
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296 pData->bJPEGscanstarted = MNG_FALSE; |
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297 pData->bJPEGscanending = MNG_FALSE; |
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298 |
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299 pData->bJPEGdecompress2 = MNG_FALSE; |
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300 pData->bJPEGhasheader2 = MNG_FALSE; |
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301 pData->bJPEGdecostarted2 = MNG_FALSE; |
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302 pData->bJPEGscanstarted2 = MNG_FALSE; |
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303 |
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304 pData->iJPEGrow = 0; /* zero input/output lines */ |
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305 pData->iJPEGalpharow = 0; |
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306 pData->iJPEGrgbrow = 0; |
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307 pData->iJPEGdisprow = 0; |
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308 |
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309 #ifdef MNG_SUPPORT_TRACE |
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310 MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_END); |
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311 #endif |
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312 |
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313 return MNG_NOERROR; |
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314 } |
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315 |
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316 /* ************************************************************************** */ |
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317 |
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318 mng_retcode mngjpeg_cleanup (mng_datap pData) |
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319 { |
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320 #if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
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321 mng_retcode iRetcode; |
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322 #endif |
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323 |
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324 #ifdef MNG_SUPPORT_TRACE |
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325 MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_START); |
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326 #endif |
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327 |
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328 #ifdef MNG_INCLUDE_IJG6B |
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329 #ifdef MNG_USE_SETJMP |
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330 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */ |
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331 if (iRetcode != 0) /* got here from longjmp ? */ |
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332 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
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333 #endif |
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334 |
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335 #ifdef MNG_INCLUDE_JNG_READ /* still decompressing something ? */ |
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336 if (pData->bJPEGdecompress) |
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337 jpeg_destroy_decompress (pData->pJPEGdinfo); |
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338 if (pData->bJPEGdecompress2) |
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339 jpeg_destroy_decompress (pData->pJPEGdinfo2); |
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340 #endif |
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341 |
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342 #ifdef MNG_INCLUDE_JNG_WRITE |
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343 if (pData->bJPEGcompress) /* still compressing something ? */ |
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344 jpeg_destroy_compress (pData->pJPEGcinfo); |
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345 #endif |
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346 |
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347 #endif /* MNG_INCLUDE_IJG6B */ |
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348 /* cleanup temporary buffers */ |
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349 MNG_FREE (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2); |
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350 MNG_FREE (pData, pData->pJPEGbuf, pData->iJPEGbufmax); |
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351 /* cleanup space for JPEG structures */ |
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352 #ifdef MNG_INCLUDE_JNG_WRITE |
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353 MNG_FREE (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp )); |
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354 MNG_FREE (pData, pData->pJPEGcerr, sizeof (mngjpeg_error )); |
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355 #endif |
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356 |
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357 #ifdef MNG_INCLUDE_JNG_READ |
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358 MNG_FREE (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp)); |
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359 MNG_FREE (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source)); |
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360 MNG_FREE (pData, pData->pJPEGderr, sizeof (mngjpeg_error )); |
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361 MNG_FREE (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp)); |
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362 MNG_FREE (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source)); |
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363 MNG_FREE (pData, pData->pJPEGderr2, sizeof (mngjpeg_error )); |
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364 #endif |
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365 |
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366 MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2); |
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367 MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen); |
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368 /* whatever we were doing ... */ |
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369 /* we don't anymore ... */ |
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370 pData->bJPEGcompress = MNG_FALSE; |
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371 |
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372 pData->bJPEGdecompress = MNG_FALSE; |
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373 pData->bJPEGhasheader = MNG_FALSE; |
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374 pData->bJPEGdecostarted = MNG_FALSE; |
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375 pData->bJPEGscanstarted = MNG_FALSE; |
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376 pData->bJPEGscanending = MNG_FALSE; |
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377 |
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378 pData->bJPEGdecompress2 = MNG_FALSE; |
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379 pData->bJPEGhasheader2 = MNG_FALSE; |
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380 pData->bJPEGdecostarted2 = MNG_FALSE; |
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381 pData->bJPEGscanstarted2 = MNG_FALSE; |
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382 |
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383 #ifdef MNG_SUPPORT_TRACE |
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384 MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_END); |
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385 #endif |
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386 |
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387 return MNG_NOERROR; |
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388 } |
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389 |
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390 /* ************************************************************************** */ |
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391 /* * * */ |
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392 /* * JPEG decompression routines (JDAT) * */ |
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393 /* * * */ |
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394 /* ************************************************************************** */ |
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395 |
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396 #ifdef MNG_INCLUDE_JNG_READ |
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397 mng_retcode mngjpeg_decompressinit (mng_datap pData) |
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398 { |
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399 #if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
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400 mng_retcode iRetcode; |
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401 #endif |
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402 |
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403 #ifdef MNG_SUPPORT_TRACE |
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404 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START); |
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405 #endif |
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406 |
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407 #ifdef MNG_INCLUDE_IJG6B |
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408 /* allocate and initialize a JPEG decompression object */ |
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409 pData->pJPEGdinfo->err = jpeg_std_error (pData->pJPEGderr); |
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410 |
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411 #ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */ |
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412 pData->pJPEGderr->error_exit = mng_error_exit; |
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413 pData->pJPEGderr->output_message = mng_output_message; |
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414 |
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415 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */ |
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416 if (iRetcode != 0) /* got here from longjmp ? */ |
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417 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
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418 #endif /* MNG_USE_SETJMP */ |
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419 |
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420 /* allocate and initialize a JPEG decompression object (continued) */ |
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421 #ifdef MNG_SUPPORT_TRACE |
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422 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS) |
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423 #endif |
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424 jpeg_create_decompress (pData->pJPEGdinfo); |
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425 |
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426 pData->bJPEGdecompress = MNG_TRUE; /* indicate it's initialized */ |
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427 |
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428 /* specify the source of the compressed data (eg, a file) */ |
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429 /* no, not a file; we have buffered input */ |
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430 pData->pJPEGdinfo->src = pData->pJPEGdsrc; |
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431 /* use the default handler */ |
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432 pData->pJPEGdinfo->src->resync_to_restart = jpeg_resync_to_restart; |
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433 /* setup local source routine & parms */ |
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434 pData->pJPEGdinfo->src->init_source = mng_init_source; |
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435 pData->pJPEGdinfo->src->fill_input_buffer = mng_fill_input_buffer; |
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436 pData->pJPEGdinfo->src->skip_input_data = mng_skip_input_data; |
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437 pData->pJPEGdinfo->src->term_source = mng_term_source; |
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438 pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent; |
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439 pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain; |
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440 |
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441 #endif /* MNG_INCLUDE_IJG6B */ |
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442 |
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443 #ifdef MNG_SUPPORT_TRACE |
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444 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END); |
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445 #endif |
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446 |
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447 return MNG_NOERROR; |
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448 } |
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449 #endif /* MNG_INCLUDE_JNG_READ */ |
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450 |
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451 /* ************************************************************************** */ |
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452 |
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453 #ifdef MNG_INCLUDE_JNG_READ |
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454 mng_retcode mngjpeg_decompressdata (mng_datap pData, |
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455 mng_uint32 iRawsize, |
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456 mng_uint8p pRawdata) |
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457 { |
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458 mng_retcode iRetcode; |
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459 mng_uint32 iRemain; |
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460 mng_uint8p pWork; |
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461 |
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462 #ifdef MNG_SUPPORT_TRACE |
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463 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START); |
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464 #endif |
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465 |
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466 #if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
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467 iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */ |
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468 if (iRetcode != 0) /* got here from longjmp ? */ |
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469 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
|
470 #endif |
|
471 |
|
472 pWork = pRawdata; |
|
473 iRemain = iRawsize; |
|
474 |
|
475 if (pData->iJPEGtoskip) /* JPEG-lib told us to skip some more data ? */ |
|
476 { |
|
477 if (iRemain > pData->iJPEGtoskip) /* enough data in this buffer ? */ |
|
478 { |
|
479 iRemain -= pData->iJPEGtoskip; /* skip enough to access the next byte */ |
|
480 pWork += pData->iJPEGtoskip; |
|
481 |
|
482 pData->iJPEGtoskip = 0; /* no more to skip then */ |
|
483 } |
|
484 else |
|
485 { |
|
486 pData->iJPEGtoskip -= iRemain; /* skip all data in the buffer */ |
|
487 iRemain = 0; /* and indicate this accordingly */ |
|
488 } |
|
489 /* the skip set current-pointer to NULL ! */ |
|
490 pData->pJPEGcurrent = pData->pJPEGbuf; |
|
491 } |
|
492 |
|
493 while (iRemain) /* repeat until no more input-bytes */ |
|
494 { /* need to shift anything ? */ |
|
495 if ((pData->pJPEGcurrent > pData->pJPEGbuf) && |
|
496 (pData->pJPEGcurrent - pData->pJPEGbuf + pData->iJPEGbufremain + iRemain > pData->iJPEGbufmax)) |
|
497 { |
|
498 if (pData->iJPEGbufremain > 0) /* then do so */ |
|
499 MNG_COPY (pData->pJPEGbuf, pData->pJPEGcurrent, pData->iJPEGbufremain); |
|
500 |
|
501 pData->pJPEGcurrent = pData->pJPEGbuf; |
|
502 } |
|
503 /* does the remaining input fit into the buffer ? */ |
|
504 if (pData->iJPEGbufremain + iRemain <= pData->iJPEGbufmax) |
|
505 { /* move the lot */ |
|
506 MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iRemain); |
|
507 |
|
508 pData->iJPEGbufremain += iRemain;/* adjust remaining_bytes counter */ |
|
509 iRemain = 0; /* and indicate there's no input left */ |
|
510 } |
|
511 else |
|
512 { /* calculate what does fit */ |
|
513 mng_uint32 iFits = pData->iJPEGbufmax - pData->iJPEGbufremain; |
|
514 |
|
515 if (iFits <= 0) /* no space is just bugger 'm all */ |
|
516 MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL); |
|
517 /* move that */ |
|
518 MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iFits); |
|
519 |
|
520 pData->iJPEGbufremain += iFits; /* adjust remain_bytes counter */ |
|
521 iRemain -= iFits; /* and the input-parms */ |
|
522 pWork += iFits; |
|
523 } |
|
524 |
|
525 #ifdef MNG_INCLUDE_IJG6B |
|
526 pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent; |
|
527 pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain; |
|
528 |
|
529 if (!pData->bJPEGhasheader) /* haven't got the header yet ? */ |
|
530 { |
|
531 /* call jpeg_read_header() to obtain image info */ |
|
532 #ifdef MNG_SUPPORT_TRACE |
|
533 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER) |
|
534 #endif |
|
535 if (jpeg_read_header (pData->pJPEGdinfo, TRUE) != JPEG_SUSPENDED) |
|
536 { /* indicate the header's oke */ |
|
537 pData->bJPEGhasheader = MNG_TRUE; |
|
538 /* let's do some sanity checks ! */ |
|
539 if ((pData->pJPEGdinfo->image_width != pData->iDatawidth ) || |
|
540 (pData->pJPEGdinfo->image_height != pData->iDataheight) ) |
|
541 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
542 |
|
543 if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAY ) || |
|
544 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA) ) && |
|
545 (pData->pJPEGdinfo->jpeg_color_space != JCS_GRAYSCALE ) ) |
|
546 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
547 |
|
548 if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLOR ) || |
|
549 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) ) && |
|
550 (pData->pJPEGdinfo->jpeg_color_space != JCS_YCbCr ) ) |
|
551 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
552 /* indicate whether or not it's progressive */ |
|
553 pData->bJPEGprogressive = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo); |
|
554 /* progressive+alpha can't display "on-the-fly"!! */ |
|
555 if ((pData->bJPEGprogressive) && |
|
556 ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA ) || |
|
557 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) )) |
|
558 pData->fDisplayrow = MNG_NULL; |
|
559 /* allocate a row of JPEG-samples */ |
|
560 if (pData->pJPEGdinfo->jpeg_color_space == JCS_YCbCr) |
|
561 pData->iJPEGrowlen = pData->pJPEGdinfo->image_width * RGB_PIXELSIZE; |
|
562 else |
|
563 pData->iJPEGrowlen = pData->pJPEGdinfo->image_width; |
|
564 |
|
565 MNG_ALLOC (pData, pData->pJPEGrow, pData->iJPEGrowlen); |
|
566 |
|
567 pData->iJPEGrgbrow = 0; /* quite empty up to now */ |
|
568 } |
|
569 |
|
570 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte; |
|
571 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer; |
|
572 } |
|
573 /* decompress not started ? */ |
|
574 if ((pData->bJPEGhasheader) && (!pData->bJPEGdecostarted)) |
|
575 { |
|
576 /* set parameters for decompression */ |
|
577 |
|
578 if (pData->bJPEGprogressive) /* progressive display ? */ |
|
579 pData->pJPEGdinfo->buffered_image = TRUE; |
|
580 |
|
581 /* jpeg_start_decompress(...); */ |
|
582 #ifdef MNG_SUPPORT_TRACE |
|
583 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS) |
|
584 #endif |
|
585 if (jpeg_start_decompress (pData->pJPEGdinfo) == TRUE) |
|
586 /* indicate it started */ |
|
587 pData->bJPEGdecostarted = MNG_TRUE; |
|
588 |
|
589 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte; |
|
590 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer; |
|
591 } |
|
592 /* process some scanlines ? */ |
|
593 if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) && |
|
594 ((!jpeg_input_complete (pData->pJPEGdinfo)) || |
|
595 (pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) || |
|
596 ((pData->bJPEGprogressive) && (pData->bJPEGscanending)))) |
|
597 { |
|
598 mng_int32 iLines = 0; |
|
599 |
|
600 /* for (each output pass) */ |
|
601 do |
|
602 { /* address the row output buffer */ |
|
603 JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow; |
|
604 |
|
605 /* init new pass ? */ |
|
606 if ((pData->bJPEGprogressive) && (!pData->bJPEGscanstarted)) |
|
607 { |
|
608 pData->bJPEGscanstarted = MNG_TRUE; |
|
609 |
|
610 /* adjust output decompression parameters if required */ |
|
611 /* nop */ |
|
612 |
|
613 /* start a new output pass */ |
|
614 #ifdef MNG_SUPPORT_TRACE |
|
615 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT) |
|
616 #endif |
|
617 jpeg_start_output (pData->pJPEGdinfo, pData->pJPEGdinfo->input_scan_number); |
|
618 |
|
619 pData->iJPEGrow = 0; /* start at row 0 in the image again */ |
|
620 } |
|
621 |
|
622 /* while (scan lines remain to be read) */ |
|
623 if ((!pData->bJPEGprogressive) || (!pData->bJPEGscanending)) |
|
624 { |
|
625 do |
|
626 { |
|
627 /* jpeg_read_scanlines(...); */ |
|
628 #ifdef MNG_SUPPORT_TRACE |
|
629 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES) |
|
630 #endif |
|
631 iLines = jpeg_read_scanlines (pData->pJPEGdinfo, (JSAMPARRAY)&pRow, 1); |
|
632 |
|
633 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte; |
|
634 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer; |
|
635 |
|
636 if (iLines > 0) /* got something ? */ |
|
637 { |
|
638 if (pData->fStorerow2) /* store in object ? */ |
|
639 { |
|
640 iRetcode = ((mng_storerow)pData->fStorerow2) (pData); |
|
641 |
|
642 if (iRetcode) /* on error bail out */ |
|
643 return iRetcode; |
|
644 |
|
645 } |
|
646 } |
|
647 } |
|
648 while ((pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) && |
|
649 (iLines > 0)); /* until end-of-image or not enough input-data */ |
|
650 } |
|
651 |
|
652 /* terminate output pass */ |
|
653 if ((pData->bJPEGprogressive) && |
|
654 (pData->pJPEGdinfo->output_scanline >= pData->pJPEGdinfo->output_height)) |
|
655 { |
|
656 #ifdef MNG_SUPPORT_TRACE |
|
657 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT) |
|
658 #endif |
|
659 if (jpeg_finish_output (pData->pJPEGdinfo) != JPEG_SUSPENDED) |
|
660 { /* this scan has ended */ |
|
661 pData->bJPEGscanstarted = MNG_FALSE; |
|
662 pData->bJPEGscanending = MNG_FALSE; |
|
663 } |
|
664 else |
|
665 { |
|
666 pData->bJPEGscanending = MNG_TRUE; |
|
667 } |
|
668 } |
|
669 } |
|
670 while ((!jpeg_input_complete (pData->pJPEGdinfo)) && |
|
671 (iLines > 0) && (!pData->bJPEGscanending)); |
|
672 } |
|
673 /* end of image ? */ |
|
674 if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) && |
|
675 (!pData->bJPEGscanending) && (jpeg_input_complete (pData->pJPEGdinfo)) && |
|
676 (pData->pJPEGdinfo->input_scan_number == pData->pJPEGdinfo->output_scan_number)) |
|
677 { |
|
678 /* jpeg_finish_decompress(...); */ |
|
679 #ifdef MNG_SUPPORT_TRACE |
|
680 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS) |
|
681 #endif |
|
682 if (jpeg_finish_decompress (pData->pJPEGdinfo) == TRUE) |
|
683 { /* indicate it's done */ |
|
684 pData->bJPEGhasheader = MNG_FALSE; |
|
685 pData->bJPEGdecostarted = MNG_FALSE; |
|
686 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte; |
|
687 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer; |
|
688 /* remaining fluff is an error ! */ |
|
689 if ((pData->iJPEGbufremain > 0) || (iRemain > 0)) |
|
690 MNG_ERROR (pData, MNG_TOOMUCHJDAT); |
|
691 } |
|
692 } |
|
693 #endif /* MNG_INCLUDE_IJG6B */ |
|
694 } |
|
695 |
|
696 #ifdef MNG_SUPPORT_TRACE |
|
697 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END); |
|
698 #endif |
|
699 |
|
700 return MNG_NOERROR; |
|
701 } |
|
702 #endif /* MNG_INCLUDE_JNG_READ */ |
|
703 |
|
704 /* ************************************************************************** */ |
|
705 |
|
706 #ifdef MNG_INCLUDE_JNG_READ |
|
707 mng_retcode mngjpeg_decompressfree (mng_datap pData) |
|
708 { |
|
709 #if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
|
710 mng_retcode iRetcode; |
|
711 #endif |
|
712 |
|
713 #ifdef MNG_SUPPORT_TRACE |
|
714 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START); |
|
715 #endif |
|
716 |
|
717 #ifdef MNG_INCLUDE_IJG6B |
|
718 #ifdef MNG_USE_SETJMP |
|
719 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */ |
|
720 if (iRetcode != 0) /* got here from longjmp ? */ |
|
721 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
|
722 #endif |
|
723 /* free the row of JPEG-samples*/ |
|
724 MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen); |
|
725 |
|
726 /* release the JPEG decompression object */ |
|
727 #ifdef MNG_SUPPORT_TRACE |
|
728 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS) |
|
729 #endif |
|
730 jpeg_destroy_decompress (pData->pJPEGdinfo); |
|
731 |
|
732 pData->bJPEGdecompress = MNG_FALSE; /* indicate it's done */ |
|
733 |
|
734 #endif /* MNG_INCLUDE_IJG6B */ |
|
735 |
|
736 #ifdef MNG_SUPPORT_TRACE |
|
737 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END); |
|
738 #endif |
|
739 |
|
740 return MNG_NOERROR; |
|
741 } |
|
742 #endif /* MNG_INCLUDE_JNG_READ */ |
|
743 |
|
744 /* ************************************************************************** */ |
|
745 /* * * */ |
|
746 /* * JPEG decompression routines (JDAA) * */ |
|
747 /* * * */ |
|
748 /* ************************************************************************** */ |
|
749 |
|
750 #ifdef MNG_INCLUDE_JNG_READ |
|
751 mng_retcode mngjpeg_decompressinit2 (mng_datap pData) |
|
752 { |
|
753 #if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
|
754 mng_retcode iRetcode; |
|
755 #endif |
|
756 |
|
757 #ifdef MNG_SUPPORT_TRACE |
|
758 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START); |
|
759 #endif |
|
760 |
|
761 #ifdef MNG_INCLUDE_IJG6B |
|
762 /* allocate and initialize a JPEG decompression object */ |
|
763 pData->pJPEGdinfo2->err = jpeg_std_error (pData->pJPEGderr2); |
|
764 |
|
765 #ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */ |
|
766 pData->pJPEGderr2->error_exit = mng_error_exit; |
|
767 pData->pJPEGderr2->output_message = mng_output_message; |
|
768 |
|
769 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */ |
|
770 if (iRetcode != 0) /* got here from longjmp ? */ |
|
771 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
|
772 #endif /* MNG_USE_SETJMP */ |
|
773 |
|
774 /* allocate and initialize a JPEG decompression object (continued) */ |
|
775 #ifdef MNG_SUPPORT_TRACE |
|
776 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS) |
|
777 #endif |
|
778 jpeg_create_decompress (pData->pJPEGdinfo2); |
|
779 |
|
780 pData->bJPEGdecompress2 = MNG_TRUE; /* indicate it's initialized */ |
|
781 |
|
782 /* specify the source of the compressed data (eg, a file) */ |
|
783 /* no, not a file; we have buffered input */ |
|
784 pData->pJPEGdinfo2->src = pData->pJPEGdsrc2; |
|
785 /* use the default handler */ |
|
786 pData->pJPEGdinfo2->src->resync_to_restart = jpeg_resync_to_restart; |
|
787 /* setup local source routine & parms */ |
|
788 pData->pJPEGdinfo2->src->init_source = mng_init_source; |
|
789 pData->pJPEGdinfo2->src->fill_input_buffer = mng_fill_input_buffer; |
|
790 pData->pJPEGdinfo2->src->skip_input_data = mng_skip_input_data2; |
|
791 pData->pJPEGdinfo2->src->term_source = mng_term_source; |
|
792 pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2; |
|
793 pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2; |
|
794 |
|
795 #endif /* MNG_INCLUDE_IJG6B */ |
|
796 |
|
797 #ifdef MNG_SUPPORT_TRACE |
|
798 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END); |
|
799 #endif |
|
800 |
|
801 return MNG_NOERROR; |
|
802 } |
|
803 #endif /* MNG_INCLUDE_JNG_READ */ |
|
804 |
|
805 /* ************************************************************************** */ |
|
806 |
|
807 #ifdef MNG_INCLUDE_JNG_READ |
|
808 mng_retcode mngjpeg_decompressdata2 (mng_datap pData, |
|
809 mng_uint32 iRawsize, |
|
810 mng_uint8p pRawdata) |
|
811 { |
|
812 mng_retcode iRetcode; |
|
813 mng_uint32 iRemain; |
|
814 mng_uint8p pWork; |
|
815 |
|
816 #ifdef MNG_SUPPORT_TRACE |
|
817 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START); |
|
818 #endif |
|
819 |
|
820 #if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
|
821 iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */ |
|
822 if (iRetcode != 0) /* got here from longjmp ? */ |
|
823 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
|
824 #endif |
|
825 |
|
826 pWork = pRawdata; |
|
827 iRemain = iRawsize; |
|
828 |
|
829 if (pData->iJPEGtoskip2) /* JPEG-lib told us to skip some more data ? */ |
|
830 { |
|
831 if (iRemain > pData->iJPEGtoskip2) /* enough data in this buffer ? */ |
|
832 { |
|
833 iRemain -= pData->iJPEGtoskip2; /* skip enough to access the next byte */ |
|
834 pWork += pData->iJPEGtoskip2; |
|
835 |
|
836 pData->iJPEGtoskip2 = 0; /* no more to skip then */ |
|
837 } |
|
838 else |
|
839 { |
|
840 pData->iJPEGtoskip2 -= iRemain; /* skip all data in the buffer */ |
|
841 iRemain = 0; /* and indicate this accordingly */ |
|
842 } |
|
843 /* the skip set current-pointer to NULL ! */ |
|
844 pData->pJPEGcurrent2 = pData->pJPEGbuf2; |
|
845 } |
|
846 |
|
847 while (iRemain) /* repeat until no more input-bytes */ |
|
848 { /* need to shift anything ? */ |
|
849 if ((pData->pJPEGcurrent2 > pData->pJPEGbuf2) && |
|
850 (pData->pJPEGcurrent2 - pData->pJPEGbuf2 + pData->iJPEGbufremain2 + iRemain > pData->iJPEGbufmax2)) |
|
851 { |
|
852 if (pData->iJPEGbufremain2 > 0) /* then do so */ |
|
853 MNG_COPY (pData->pJPEGbuf2, pData->pJPEGcurrent2, pData->iJPEGbufremain2); |
|
854 |
|
855 pData->pJPEGcurrent2 = pData->pJPEGbuf2; |
|
856 } |
|
857 /* does the remaining input fit into the buffer ? */ |
|
858 if (pData->iJPEGbufremain2 + iRemain <= pData->iJPEGbufmax2) |
|
859 { /* move the lot */ |
|
860 MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iRemain); |
|
861 /* adjust remaining_bytes counter */ |
|
862 pData->iJPEGbufremain2 += iRemain; |
|
863 iRemain = 0; /* and indicate there's no input left */ |
|
864 } |
|
865 else |
|
866 { /* calculate what does fit */ |
|
867 mng_uint32 iFits = pData->iJPEGbufmax2 - pData->iJPEGbufremain2; |
|
868 |
|
869 if (iFits <= 0) /* no space is just bugger 'm all */ |
|
870 MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL); |
|
871 /* move that */ |
|
872 MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iFits); |
|
873 |
|
874 pData->iJPEGbufremain2 += iFits; /* adjust remain_bytes counter */ |
|
875 iRemain -= iFits; /* and the input-parms */ |
|
876 pWork += iFits; |
|
877 } |
|
878 |
|
879 #ifdef MNG_INCLUDE_IJG6B |
|
880 pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2; |
|
881 pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2; |
|
882 |
|
883 if (!pData->bJPEGhasheader2) /* haven't got the header yet ? */ |
|
884 { |
|
885 /* call jpeg_read_header() to obtain image info */ |
|
886 #ifdef MNG_SUPPORT_TRACE |
|
887 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER) |
|
888 #endif |
|
889 if (jpeg_read_header (pData->pJPEGdinfo2, TRUE) != JPEG_SUSPENDED) |
|
890 { /* indicate the header's oke */ |
|
891 pData->bJPEGhasheader2 = MNG_TRUE; |
|
892 /* let's do some sanity checks ! */ |
|
893 if ((pData->pJPEGdinfo2->image_width != pData->iDatawidth ) || |
|
894 (pData->pJPEGdinfo2->image_height != pData->iDataheight) ) |
|
895 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
896 |
|
897 if (pData->pJPEGdinfo2->jpeg_color_space != JCS_GRAYSCALE) |
|
898 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
899 /* indicate whether or not it's progressive */ |
|
900 pData->bJPEGprogressive2 = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo2); |
|
901 |
|
902 if (pData->bJPEGprogressive2) /* progressive alphachannel not allowed !!! */ |
|
903 MNG_ERROR (pData, MNG_JPEGPARMSERR); |
|
904 /* allocate a row of JPEG-samples */ |
|
905 if (pData->pJPEGdinfo2->jpeg_color_space == JCS_YCbCr) |
|
906 pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width * RGB_PIXELSIZE; |
|
907 else |
|
908 pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width; |
|
909 |
|
910 MNG_ALLOC (pData, pData->pJPEGrow2, pData->iJPEGrowlen2); |
|
911 |
|
912 pData->iJPEGalpharow = 0; /* quite empty up to now */ |
|
913 } |
|
914 |
|
915 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte; |
|
916 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer; |
|
917 } |
|
918 /* decompress not started ? */ |
|
919 if ((pData->bJPEGhasheader2) && (!pData->bJPEGdecostarted2)) |
|
920 { |
|
921 /* set parameters for decompression */ |
|
922 |
|
923 if (pData->bJPEGprogressive2) /* progressive display ? */ |
|
924 pData->pJPEGdinfo2->buffered_image = TRUE; |
|
925 |
|
926 /* jpeg_start_decompress(...); */ |
|
927 #ifdef MNG_SUPPORT_TRACE |
|
928 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS) |
|
929 #endif |
|
930 if (jpeg_start_decompress (pData->pJPEGdinfo2) == TRUE) |
|
931 /* indicate it started */ |
|
932 pData->bJPEGdecostarted2 = MNG_TRUE; |
|
933 |
|
934 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte; |
|
935 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer; |
|
936 } |
|
937 /* process some scanlines ? */ |
|
938 if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) && |
|
939 ((!jpeg_input_complete (pData->pJPEGdinfo2)) || |
|
940 (pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height))) |
|
941 { |
|
942 mng_int32 iLines; |
|
943 |
|
944 /* for (each output pass) */ |
|
945 do |
|
946 { /* address the row output buffer */ |
|
947 JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow2; |
|
948 |
|
949 /* init new pass ? */ |
|
950 if ((pData->bJPEGprogressive2) && |
|
951 ((!pData->bJPEGscanstarted2) || |
|
952 (pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height))) |
|
953 { |
|
954 pData->bJPEGscanstarted2 = MNG_TRUE; |
|
955 |
|
956 /* adjust output decompression parameters if required */ |
|
957 /* nop */ |
|
958 |
|
959 /* start a new output pass */ |
|
960 #ifdef MNG_SUPPORT_TRACE |
|
961 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT) |
|
962 #endif |
|
963 jpeg_start_output (pData->pJPEGdinfo2, pData->pJPEGdinfo2->input_scan_number); |
|
964 |
|
965 pData->iJPEGrow = 0; /* start at row 0 in the image again */ |
|
966 } |
|
967 |
|
968 /* while (scan lines remain to be read) */ |
|
969 do |
|
970 { |
|
971 /* jpeg_read_scanlines(...); */ |
|
972 #ifdef MNG_SUPPORT_TRACE |
|
973 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES) |
|
974 #endif |
|
975 iLines = jpeg_read_scanlines (pData->pJPEGdinfo2, (JSAMPARRAY)&pRow, 1); |
|
976 |
|
977 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte; |
|
978 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer; |
|
979 |
|
980 if (iLines > 0) /* got something ? */ |
|
981 { |
|
982 if (pData->fStorerow3) /* store in object ? */ |
|
983 { |
|
984 iRetcode = ((mng_storerow)pData->fStorerow3) (pData); |
|
985 |
|
986 if (iRetcode) /* on error bail out */ |
|
987 return iRetcode; |
|
988 |
|
989 } |
|
990 } |
|
991 } |
|
992 while ((pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height) && |
|
993 (iLines > 0)); /* until end-of-image or not enough input-data */ |
|
994 |
|
995 /* terminate output pass */ |
|
996 if ((pData->bJPEGprogressive2) && |
|
997 (pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height)) |
|
998 { |
|
999 #ifdef MNG_SUPPORT_TRACE |
|
1000 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT) |
|
1001 #endif |
|
1002 if (jpeg_finish_output (pData->pJPEGdinfo2) == JPEG_SUSPENDED) |
|
1003 jpeg_finish_output (pData->pJPEGdinfo2); |
|
1004 /* this scan has ended */ |
|
1005 pData->bJPEGscanstarted2 = MNG_FALSE; |
|
1006 } |
|
1007 } |
|
1008 while ((!jpeg_input_complete (pData->pJPEGdinfo2)) && (iLines > 0)); |
|
1009 } |
|
1010 /* end of image ? */ |
|
1011 if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) && |
|
1012 (jpeg_input_complete (pData->pJPEGdinfo2)) && |
|
1013 (pData->pJPEGdinfo2->input_scan_number == pData->pJPEGdinfo2->output_scan_number)) |
|
1014 { |
|
1015 /* jpeg_finish_decompress(...); */ |
|
1016 #ifdef MNG_SUPPORT_TRACE |
|
1017 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS) |
|
1018 #endif |
|
1019 if (jpeg_finish_decompress (pData->pJPEGdinfo2) == TRUE) |
|
1020 { /* indicate it's done */ |
|
1021 pData->bJPEGhasheader2 = MNG_FALSE; |
|
1022 pData->bJPEGdecostarted2 = MNG_FALSE; |
|
1023 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte; |
|
1024 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer; |
|
1025 /* remaining fluff is an error ! */ |
|
1026 if ((pData->iJPEGbufremain2 > 0) || (iRemain > 0)) |
|
1027 MNG_ERROR (pData, MNG_TOOMUCHJDAT); |
|
1028 } |
|
1029 } |
|
1030 #endif /* MNG_INCLUDE_IJG6B */ |
|
1031 } |
|
1032 |
|
1033 #ifdef MNG_SUPPORT_TRACE |
|
1034 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END); |
|
1035 #endif |
|
1036 |
|
1037 return MNG_NOERROR; |
|
1038 } |
|
1039 #endif /* MNG_INCLUDE_JNG_READ */ |
|
1040 |
|
1041 /* ************************************************************************** */ |
|
1042 |
|
1043 #ifdef MNG_INCLUDE_JNG_READ |
|
1044 mng_retcode mngjpeg_decompressfree2 (mng_datap pData) |
|
1045 { |
|
1046 #if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP) |
|
1047 mng_retcode iRetcode; |
|
1048 #endif |
|
1049 |
|
1050 #ifdef MNG_SUPPORT_TRACE |
|
1051 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START); |
|
1052 #endif |
|
1053 |
|
1054 #ifdef MNG_INCLUDE_IJG6B |
|
1055 #ifdef MNG_USE_SETJMP |
|
1056 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */ |
|
1057 if (iRetcode != 0) /* got here from longjmp ? */ |
|
1058 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */ |
|
1059 #endif |
|
1060 /* free the row of JPEG-samples*/ |
|
1061 MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2); |
|
1062 |
|
1063 /* release the JPEG decompression object */ |
|
1064 #ifdef MNG_SUPPORT_TRACE |
|
1065 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS) |
|
1066 #endif |
|
1067 jpeg_destroy_decompress (pData->pJPEGdinfo2); |
|
1068 |
|
1069 pData->bJPEGdecompress2 = MNG_FALSE; /* indicate it's done */ |
|
1070 |
|
1071 #endif /* MNG_INCLUDE_IJG6B */ |
|
1072 |
|
1073 #ifdef MNG_SUPPORT_TRACE |
|
1074 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END); |
|
1075 #endif |
|
1076 |
|
1077 return MNG_NOERROR; |
|
1078 } |
|
1079 #endif /* MNG_INCLUDE_JNG_READ */ |
|
1080 |
|
1081 /* ************************************************************************** */ |
|
1082 |
|
1083 #endif /* MNG_INCLUDE_JNG && MNG_INCLUDE_DISPLAY_PROCS */ |
|
1084 |
|
1085 /* ************************************************************************** */ |
|
1086 /* * end of file * */ |
|
1087 /* ************************************************************************** */ |
|
1088 |