| 1 |
william |
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/* pngpread.c - read a png file in push mode |
| 3 |
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* |
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* Last changed in libpng 1.2.38 [July 16, 2009] |
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson |
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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* |
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* This code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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*/ |
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#define PNG_INTERNAL |
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#include "png.h" |
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#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
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/* Push model modes */ |
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#define PNG_READ_SIG_MODE 0 |
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#define PNG_READ_CHUNK_MODE 1 |
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#define PNG_READ_IDAT_MODE 2 |
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#define PNG_SKIP_MODE 3 |
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#define PNG_READ_tEXt_MODE 4 |
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#define PNG_READ_zTXt_MODE 5 |
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#define PNG_READ_DONE_MODE 6 |
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#define PNG_READ_iTXt_MODE 7 |
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#define PNG_ERROR_MODE 8 |
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void PNGAPI |
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png_process_data(png_structp png_ptr, png_infop info_ptr, |
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png_bytep buffer, png_size_t buffer_size) |
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{ |
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if (png_ptr == NULL || info_ptr == NULL) |
| 34 |
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return; |
| 35 |
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png_push_restore_buffer(png_ptr, buffer, buffer_size); |
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while (png_ptr->buffer_size) |
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{ |
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png_process_some_data(png_ptr, info_ptr); |
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} |
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} |
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/* What we do with the incoming data depends on what we were previously |
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* doing before we ran out of data... |
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*/ |
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void /* PRIVATE */ |
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png_process_some_data(png_structp png_ptr, png_infop info_ptr) |
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{ |
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if (png_ptr == NULL) |
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return; |
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switch (png_ptr->process_mode) |
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{ |
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case PNG_READ_SIG_MODE: |
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{ |
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png_push_read_sig(png_ptr, info_ptr); |
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break; |
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} |
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case PNG_READ_CHUNK_MODE: |
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{ |
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png_push_read_chunk(png_ptr, info_ptr); |
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break; |
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} |
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case PNG_READ_IDAT_MODE: |
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{ |
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png_push_read_IDAT(png_ptr); |
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break; |
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} |
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#if defined(PNG_READ_tEXt_SUPPORTED) |
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case PNG_READ_tEXt_MODE: |
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{ |
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png_push_read_tEXt(png_ptr, info_ptr); |
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break; |
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} |
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#endif |
| 81 |
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#if defined(PNG_READ_zTXt_SUPPORTED) |
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case PNG_READ_zTXt_MODE: |
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{ |
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png_push_read_zTXt(png_ptr, info_ptr); |
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break; |
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} |
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#endif |
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#if defined(PNG_READ_iTXt_SUPPORTED) |
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case PNG_READ_iTXt_MODE: |
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{ |
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png_push_read_iTXt(png_ptr, info_ptr); |
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break; |
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} |
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#endif |
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case PNG_SKIP_MODE: |
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{ |
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png_push_crc_finish(png_ptr); |
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break; |
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} |
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default: |
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{ |
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png_ptr->buffer_size = 0; |
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break; |
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} |
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} |
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} |
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/* Read any remaining signature bytes from the stream and compare them with |
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* the correct PNG signature. It is possible that this routine is called |
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* with bytes already read from the signature, either because they have been |
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* checked by the calling application, or because of multiple calls to this |
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* routine. |
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*/ |
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void /* PRIVATE */ |
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png_push_read_sig(png_structp png_ptr, png_infop info_ptr) |
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{ |
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png_size_t num_checked = png_ptr->sig_bytes, |
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num_to_check = 8 - num_checked; |
| 122 |
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| 123 |
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if (png_ptr->buffer_size < num_to_check) |
| 124 |
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{ |
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num_to_check = png_ptr->buffer_size; |
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} |
| 127 |
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| 128 |
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png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), |
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num_to_check); |
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png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check); |
| 131 |
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if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 133 |
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{ |
| 134 |
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if (num_checked < 4 && |
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png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 136 |
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png_error(png_ptr, "Not a PNG file"); |
| 137 |
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else |
| 138 |
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png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 139 |
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} |
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else |
| 141 |
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{ |
| 142 |
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if (png_ptr->sig_bytes >= 8) |
| 143 |
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{ |
| 144 |
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png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 145 |
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} |
| 146 |
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} |
| 147 |
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} |
| 148 |
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| 149 |
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void /* PRIVATE */ |
| 150 |
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png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) |
| 151 |
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{ |
| 152 |
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#ifdef PNG_USE_LOCAL_ARRAYS |
| 153 |
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PNG_CONST PNG_IHDR; |
| 154 |
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PNG_CONST PNG_IDAT; |
| 155 |
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PNG_CONST PNG_IEND; |
| 156 |
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PNG_CONST PNG_PLTE; |
| 157 |
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#if defined(PNG_READ_bKGD_SUPPORTED) |
| 158 |
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PNG_CONST PNG_bKGD; |
| 159 |
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#endif |
| 160 |
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#if defined(PNG_READ_cHRM_SUPPORTED) |
| 161 |
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PNG_CONST PNG_cHRM; |
| 162 |
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#endif |
| 163 |
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#if defined(PNG_READ_gAMA_SUPPORTED) |
| 164 |
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PNG_CONST PNG_gAMA; |
| 165 |
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#endif |
| 166 |
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#if defined(PNG_READ_hIST_SUPPORTED) |
| 167 |
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PNG_CONST PNG_hIST; |
| 168 |
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#endif |
| 169 |
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#if defined(PNG_READ_iCCP_SUPPORTED) |
| 170 |
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PNG_CONST PNG_iCCP; |
| 171 |
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#endif |
| 172 |
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#if defined(PNG_READ_iTXt_SUPPORTED) |
| 173 |
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PNG_CONST PNG_iTXt; |
| 174 |
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#endif |
| 175 |
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#if defined(PNG_READ_oFFs_SUPPORTED) |
| 176 |
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PNG_CONST PNG_oFFs; |
| 177 |
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#endif |
| 178 |
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#if defined(PNG_READ_pCAL_SUPPORTED) |
| 179 |
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PNG_CONST PNG_pCAL; |
| 180 |
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#endif |
| 181 |
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#if defined(PNG_READ_pHYs_SUPPORTED) |
| 182 |
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PNG_CONST PNG_pHYs; |
| 183 |
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#endif |
| 184 |
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#if defined(PNG_READ_sBIT_SUPPORTED) |
| 185 |
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PNG_CONST PNG_sBIT; |
| 186 |
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#endif |
| 187 |
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#if defined(PNG_READ_sCAL_SUPPORTED) |
| 188 |
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PNG_CONST PNG_sCAL; |
| 189 |
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#endif |
| 190 |
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#if defined(PNG_READ_sRGB_SUPPORTED) |
| 191 |
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PNG_CONST PNG_sRGB; |
| 192 |
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#endif |
| 193 |
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#if defined(PNG_READ_sPLT_SUPPORTED) |
| 194 |
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PNG_CONST PNG_sPLT; |
| 195 |
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#endif |
| 196 |
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#if defined(PNG_READ_tEXt_SUPPORTED) |
| 197 |
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PNG_CONST PNG_tEXt; |
| 198 |
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#endif |
| 199 |
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#if defined(PNG_READ_tIME_SUPPORTED) |
| 200 |
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PNG_CONST PNG_tIME; |
| 201 |
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#endif |
| 202 |
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#if defined(PNG_READ_tRNS_SUPPORTED) |
| 203 |
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PNG_CONST PNG_tRNS; |
| 204 |
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#endif |
| 205 |
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#if defined(PNG_READ_zTXt_SUPPORTED) |
| 206 |
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PNG_CONST PNG_zTXt; |
| 207 |
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#endif |
| 208 |
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#endif /* PNG_USE_LOCAL_ARRAYS */ |
| 209 |
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/* First we make sure we have enough data for the 4 byte chunk name |
| 210 |
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* and the 4 byte chunk length before proceeding with decoding the |
| 211 |
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* chunk data. To fully decode each of these chunks, we also make |
| 212 |
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* sure we have enough data in the buffer for the 4 byte CRC at the |
| 213 |
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* end of every chunk (except IDAT, which is handled separately). |
| 214 |
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*/ |
| 215 |
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if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 216 |
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{ |
| 217 |
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png_byte chunk_length[4]; |
| 218 |
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| 219 |
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if (png_ptr->buffer_size < 8) |
| 220 |
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{ |
| 221 |
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png_push_save_buffer(png_ptr); |
| 222 |
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return; |
| 223 |
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} |
| 224 |
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| 225 |
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png_push_fill_buffer(png_ptr, chunk_length, 4); |
| 226 |
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png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
| 227 |
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png_reset_crc(png_ptr); |
| 228 |
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png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 229 |
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png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
| 230 |
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png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 231 |
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} |
| 232 |
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| 233 |
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 234 |
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if (png_ptr->mode & PNG_AFTER_IDAT) |
| 235 |
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png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 236 |
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| 237 |
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if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| 238 |
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{ |
| 239 |
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if (png_ptr->push_length != 13) |
| 240 |
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png_error(png_ptr, "Invalid IHDR length"); |
| 241 |
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| 242 |
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 243 |
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{ |
| 244 |
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png_push_save_buffer(png_ptr); |
| 245 |
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return; |
| 246 |
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} |
| 247 |
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| 248 |
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png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); |
| 249 |
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} |
| 250 |
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| 251 |
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else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| 252 |
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{ |
| 253 |
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 254 |
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{ |
| 255 |
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png_push_save_buffer(png_ptr); |
| 256 |
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return; |
| 257 |
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} |
| 258 |
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| 259 |
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png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); |
| 260 |
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| 261 |
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png_ptr->process_mode = PNG_READ_DONE_MODE; |
| 262 |
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png_push_have_end(png_ptr, info_ptr); |
| 263 |
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} |
| 264 |
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| 265 |
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#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 266 |
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else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
| 267 |
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{ |
| 268 |
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 269 |
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{ |
| 270 |
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png_push_save_buffer(png_ptr); |
| 271 |
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return; |
| 272 |
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} |
| 273 |
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| 274 |
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 275 |
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png_ptr->mode |= PNG_HAVE_IDAT; |
| 276 |
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| 277 |
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png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
| 278 |
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| 279 |
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if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 280 |
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png_ptr->mode |= PNG_HAVE_PLTE; |
| 281 |
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| 282 |
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 283 |
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{ |
| 284 |
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if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 285 |
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png_error(png_ptr, "Missing IHDR before IDAT"); |
| 286 |
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| 287 |
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 288 |
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!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 289 |
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png_error(png_ptr, "Missing PLTE before IDAT"); |
| 290 |
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} |
| 291 |
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} |
| 292 |
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| 293 |
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#endif |
| 294 |
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else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 295 |
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{ |
| 296 |
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 297 |
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{ |
| 298 |
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png_push_save_buffer(png_ptr); |
| 299 |
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return; |
| 300 |
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} |
| 301 |
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png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); |
| 302 |
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} |
| 303 |
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| 304 |
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 305 |
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{ |
| 306 |
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/* If we reach an IDAT chunk, this means we have read all of the |
| 307 |
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* header chunks, and we can start reading the image (or if this |
| 308 |
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* is called after the image has been read - we have an error). |
| 309 |
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*/ |
| 310 |
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| 311 |
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if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 312 |
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png_error(png_ptr, "Missing IHDR before IDAT"); |
| 313 |
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| 314 |
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 315 |
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!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 316 |
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png_error(png_ptr, "Missing PLTE before IDAT"); |
| 317 |
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| 318 |
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if (png_ptr->mode & PNG_HAVE_IDAT) |
| 319 |
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{ |
| 320 |
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if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 321 |
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if (png_ptr->push_length == 0) |
| 322 |
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return; |
| 323 |
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| 324 |
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if (png_ptr->mode & PNG_AFTER_IDAT) |
| 325 |
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png_error(png_ptr, "Too many IDAT's found"); |
| 326 |
|
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} |
| 327 |
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| 328 |
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png_ptr->idat_size = png_ptr->push_length; |
| 329 |
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png_ptr->mode |= PNG_HAVE_IDAT; |
| 330 |
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png_ptr->process_mode = PNG_READ_IDAT_MODE; |
| 331 |
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png_push_have_info(png_ptr, info_ptr); |
| 332 |
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png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 333 |
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png_ptr->zstream.next_out = png_ptr->row_buf; |
| 334 |
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return; |
| 335 |
|
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} |
| 336 |
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|
| 337 |
|
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#if defined(PNG_READ_gAMA_SUPPORTED) |
| 338 |
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else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| 339 |
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{ |
| 340 |
|
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 341 |
|
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{ |
| 342 |
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png_push_save_buffer(png_ptr); |
| 343 |
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return; |
| 344 |
|
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} |
| 345 |
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|
| 346 |
|
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png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); |
| 347 |
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} |
| 348 |
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|
| 349 |
|
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#endif |
| 350 |
|
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#if defined(PNG_READ_sBIT_SUPPORTED) |
| 351 |
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else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| 352 |
|
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{ |
| 353 |
|
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if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 354 |
|
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{ |
| 355 |
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png_push_save_buffer(png_ptr); |
| 356 |
|
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return; |
| 357 |
|
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} |
| 358 |
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|
| 359 |
|
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png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); |
| 360 |
|
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} |
| 361 |
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|
| 362 |
|
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#endif |
| 363 |
|
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#if defined(PNG_READ_cHRM_SUPPORTED) |
| 364 |
|
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else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| 365 |
|
|
{ |
| 366 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 367 |
|
|
{ |
| 368 |
|
|
png_push_save_buffer(png_ptr); |
| 369 |
|
|
return; |
| 370 |
|
|
} |
| 371 |
|
|
|
| 372 |
|
|
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); |
| 373 |
|
|
} |
| 374 |
|
|
|
| 375 |
|
|
#endif |
| 376 |
|
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
| 377 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| 378 |
|
|
{ |
| 379 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 380 |
|
|
{ |
| 381 |
|
|
png_push_save_buffer(png_ptr); |
| 382 |
|
|
return; |
| 383 |
|
|
} |
| 384 |
|
|
|
| 385 |
|
|
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); |
| 386 |
|
|
} |
| 387 |
|
|
|
| 388 |
|
|
#endif |
| 389 |
|
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
| 390 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
| 391 |
|
|
{ |
| 392 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 393 |
|
|
{ |
| 394 |
|
|
png_push_save_buffer(png_ptr); |
| 395 |
|
|
return; |
| 396 |
|
|
} |
| 397 |
|
|
|
| 398 |
|
|
png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length); |
| 399 |
|
|
} |
| 400 |
|
|
|
| 401 |
|
|
#endif |
| 402 |
|
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
| 403 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
| 404 |
|
|
{ |
| 405 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 406 |
|
|
{ |
| 407 |
|
|
png_push_save_buffer(png_ptr); |
| 408 |
|
|
return; |
| 409 |
|
|
} |
| 410 |
|
|
|
| 411 |
|
|
png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length); |
| 412 |
|
|
} |
| 413 |
|
|
|
| 414 |
|
|
#endif |
| 415 |
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
| 416 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| 417 |
|
|
{ |
| 418 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 419 |
|
|
{ |
| 420 |
|
|
png_push_save_buffer(png_ptr); |
| 421 |
|
|
return; |
| 422 |
|
|
} |
| 423 |
|
|
|
| 424 |
|
|
png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); |
| 425 |
|
|
} |
| 426 |
|
|
|
| 427 |
|
|
#endif |
| 428 |
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
| 429 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| 430 |
|
|
{ |
| 431 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 432 |
|
|
{ |
| 433 |
|
|
png_push_save_buffer(png_ptr); |
| 434 |
|
|
return; |
| 435 |
|
|
} |
| 436 |
|
|
|
| 437 |
|
|
png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); |
| 438 |
|
|
} |
| 439 |
|
|
|
| 440 |
|
|
#endif |
| 441 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 442 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| 443 |
|
|
{ |
| 444 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 445 |
|
|
{ |
| 446 |
|
|
png_push_save_buffer(png_ptr); |
| 447 |
|
|
return; |
| 448 |
|
|
} |
| 449 |
|
|
|
| 450 |
|
|
png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); |
| 451 |
|
|
} |
| 452 |
|
|
|
| 453 |
|
|
#endif |
| 454 |
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
| 455 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| 456 |
|
|
{ |
| 457 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 458 |
|
|
{ |
| 459 |
|
|
png_push_save_buffer(png_ptr); |
| 460 |
|
|
return; |
| 461 |
|
|
} |
| 462 |
|
|
|
| 463 |
|
|
png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); |
| 464 |
|
|
} |
| 465 |
|
|
|
| 466 |
|
|
#endif |
| 467 |
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
| 468 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| 469 |
|
|
{ |
| 470 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 471 |
|
|
{ |
| 472 |
|
|
png_push_save_buffer(png_ptr); |
| 473 |
|
|
return; |
| 474 |
|
|
} |
| 475 |
|
|
|
| 476 |
|
|
png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); |
| 477 |
|
|
} |
| 478 |
|
|
#endif |
| 479 |
|
|
|
| 480 |
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
| 481 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| 482 |
|
|
{ |
| 483 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 484 |
|
|
{ |
| 485 |
|
|
png_push_save_buffer(png_ptr); |
| 486 |
|
|
return; |
| 487 |
|
|
} |
| 488 |
|
|
|
| 489 |
|
|
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 490 |
|
|
} |
| 491 |
|
|
|
| 492 |
|
|
#endif |
| 493 |
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
| 494 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
| 495 |
|
|
{ |
| 496 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 497 |
|
|
{ |
| 498 |
|
|
png_push_save_buffer(png_ptr); |
| 499 |
|
|
return; |
| 500 |
|
|
} |
| 501 |
|
|
|
| 502 |
|
|
png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 503 |
|
|
} |
| 504 |
|
|
|
| 505 |
|
|
#endif |
| 506 |
|
|
#if defined(PNG_READ_tIME_SUPPORTED) |
| 507 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| 508 |
|
|
{ |
| 509 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 510 |
|
|
{ |
| 511 |
|
|
png_push_save_buffer(png_ptr); |
| 512 |
|
|
return; |
| 513 |
|
|
} |
| 514 |
|
|
|
| 515 |
|
|
png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); |
| 516 |
|
|
} |
| 517 |
|
|
|
| 518 |
|
|
#endif |
| 519 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 520 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| 521 |
|
|
{ |
| 522 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 523 |
|
|
{ |
| 524 |
|
|
png_push_save_buffer(png_ptr); |
| 525 |
|
|
return; |
| 526 |
|
|
} |
| 527 |
|
|
|
| 528 |
|
|
png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); |
| 529 |
|
|
} |
| 530 |
|
|
|
| 531 |
|
|
#endif |
| 532 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 533 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| 534 |
|
|
{ |
| 535 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 536 |
|
|
{ |
| 537 |
|
|
png_push_save_buffer(png_ptr); |
| 538 |
|
|
return; |
| 539 |
|
|
} |
| 540 |
|
|
|
| 541 |
|
|
png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 542 |
|
|
} |
| 543 |
|
|
|
| 544 |
|
|
#endif |
| 545 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 546 |
|
|
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
| 547 |
|
|
{ |
| 548 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 549 |
|
|
{ |
| 550 |
|
|
png_push_save_buffer(png_ptr); |
| 551 |
|
|
return; |
| 552 |
|
|
} |
| 553 |
|
|
|
| 554 |
|
|
png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 555 |
|
|
} |
| 556 |
|
|
|
| 557 |
|
|
#endif |
| 558 |
|
|
else |
| 559 |
|
|
{ |
| 560 |
|
|
if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 561 |
|
|
{ |
| 562 |
|
|
png_push_save_buffer(png_ptr); |
| 563 |
|
|
return; |
| 564 |
|
|
} |
| 565 |
|
|
png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
| 566 |
|
|
} |
| 567 |
|
|
|
| 568 |
|
|
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 569 |
|
|
} |
| 570 |
|
|
|
| 571 |
|
|
void /* PRIVATE */ |
| 572 |
|
|
png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) |
| 573 |
|
|
{ |
| 574 |
|
|
png_ptr->process_mode = PNG_SKIP_MODE; |
| 575 |
|
|
png_ptr->skip_length = skip; |
| 576 |
|
|
} |
| 577 |
|
|
|
| 578 |
|
|
void /* PRIVATE */ |
| 579 |
|
|
png_push_crc_finish(png_structp png_ptr) |
| 580 |
|
|
{ |
| 581 |
|
|
if (png_ptr->skip_length && png_ptr->save_buffer_size) |
| 582 |
|
|
{ |
| 583 |
|
|
png_size_t save_size; |
| 584 |
|
|
|
| 585 |
|
|
if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) |
| 586 |
|
|
save_size = (png_size_t)png_ptr->skip_length; |
| 587 |
|
|
else |
| 588 |
|
|
save_size = png_ptr->save_buffer_size; |
| 589 |
|
|
|
| 590 |
|
|
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 591 |
|
|
|
| 592 |
|
|
png_ptr->skip_length -= save_size; |
| 593 |
|
|
png_ptr->buffer_size -= save_size; |
| 594 |
|
|
png_ptr->save_buffer_size -= save_size; |
| 595 |
|
|
png_ptr->save_buffer_ptr += save_size; |
| 596 |
|
|
} |
| 597 |
|
|
if (png_ptr->skip_length && png_ptr->current_buffer_size) |
| 598 |
|
|
{ |
| 599 |
|
|
png_size_t save_size; |
| 600 |
|
|
|
| 601 |
|
|
if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) |
| 602 |
|
|
save_size = (png_size_t)png_ptr->skip_length; |
| 603 |
|
|
else |
| 604 |
|
|
save_size = png_ptr->current_buffer_size; |
| 605 |
|
|
|
| 606 |
|
|
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 607 |
|
|
|
| 608 |
|
|
png_ptr->skip_length -= save_size; |
| 609 |
|
|
png_ptr->buffer_size -= save_size; |
| 610 |
|
|
png_ptr->current_buffer_size -= save_size; |
| 611 |
|
|
png_ptr->current_buffer_ptr += save_size; |
| 612 |
|
|
} |
| 613 |
|
|
if (!png_ptr->skip_length) |
| 614 |
|
|
{ |
| 615 |
|
|
if (png_ptr->buffer_size < 4) |
| 616 |
|
|
{ |
| 617 |
|
|
png_push_save_buffer(png_ptr); |
| 618 |
|
|
return; |
| 619 |
|
|
} |
| 620 |
|
|
|
| 621 |
|
|
png_crc_finish(png_ptr, 0); |
| 622 |
|
|
png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 623 |
|
|
} |
| 624 |
|
|
} |
| 625 |
|
|
|
| 626 |
|
|
void PNGAPI |
| 627 |
|
|
png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) |
| 628 |
|
|
{ |
| 629 |
|
|
png_bytep ptr; |
| 630 |
|
|
|
| 631 |
|
|
if (png_ptr == NULL) |
| 632 |
|
|
return; |
| 633 |
|
|
|
| 634 |
|
|
ptr = buffer; |
| 635 |
|
|
if (png_ptr->save_buffer_size) |
| 636 |
|
|
{ |
| 637 |
|
|
png_size_t save_size; |
| 638 |
|
|
|
| 639 |
|
|
if (length < png_ptr->save_buffer_size) |
| 640 |
|
|
save_size = length; |
| 641 |
|
|
else |
| 642 |
|
|
save_size = png_ptr->save_buffer_size; |
| 643 |
|
|
|
| 644 |
|
|
png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); |
| 645 |
|
|
length -= save_size; |
| 646 |
|
|
ptr += save_size; |
| 647 |
|
|
png_ptr->buffer_size -= save_size; |
| 648 |
|
|
png_ptr->save_buffer_size -= save_size; |
| 649 |
|
|
png_ptr->save_buffer_ptr += save_size; |
| 650 |
|
|
} |
| 651 |
|
|
if (length && png_ptr->current_buffer_size) |
| 652 |
|
|
{ |
| 653 |
|
|
png_size_t save_size; |
| 654 |
|
|
|
| 655 |
|
|
if (length < png_ptr->current_buffer_size) |
| 656 |
|
|
save_size = length; |
| 657 |
|
|
|
| 658 |
|
|
else |
| 659 |
|
|
save_size = png_ptr->current_buffer_size; |
| 660 |
|
|
|
| 661 |
|
|
png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); |
| 662 |
|
|
png_ptr->buffer_size -= save_size; |
| 663 |
|
|
png_ptr->current_buffer_size -= save_size; |
| 664 |
|
|
png_ptr->current_buffer_ptr += save_size; |
| 665 |
|
|
} |
| 666 |
|
|
} |
| 667 |
|
|
|
| 668 |
|
|
void /* PRIVATE */ |
| 669 |
|
|
png_push_save_buffer(png_structp png_ptr) |
| 670 |
|
|
{ |
| 671 |
|
|
if (png_ptr->save_buffer_size) |
| 672 |
|
|
{ |
| 673 |
|
|
if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) |
| 674 |
|
|
{ |
| 675 |
|
|
png_size_t i, istop; |
| 676 |
|
|
png_bytep sp; |
| 677 |
|
|
png_bytep dp; |
| 678 |
|
|
|
| 679 |
|
|
istop = png_ptr->save_buffer_size; |
| 680 |
|
|
for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; |
| 681 |
|
|
i < istop; i++, sp++, dp++) |
| 682 |
|
|
{ |
| 683 |
|
|
*dp = *sp; |
| 684 |
|
|
} |
| 685 |
|
|
} |
| 686 |
|
|
} |
| 687 |
|
|
if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > |
| 688 |
|
|
png_ptr->save_buffer_max) |
| 689 |
|
|
{ |
| 690 |
|
|
png_size_t new_max; |
| 691 |
|
|
png_bytep old_buffer; |
| 692 |
|
|
|
| 693 |
|
|
if (png_ptr->save_buffer_size > PNG_SIZE_MAX - |
| 694 |
|
|
(png_ptr->current_buffer_size + 256)) |
| 695 |
|
|
{ |
| 696 |
|
|
png_error(png_ptr, "Potential overflow of save_buffer"); |
| 697 |
|
|
} |
| 698 |
|
|
|
| 699 |
|
|
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; |
| 700 |
|
|
old_buffer = png_ptr->save_buffer; |
| 701 |
|
|
png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, |
| 702 |
|
|
(png_uint_32)new_max); |
| 703 |
|
|
png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); |
| 704 |
|
|
png_free(png_ptr, old_buffer); |
| 705 |
|
|
png_ptr->save_buffer_max = new_max; |
| 706 |
|
|
} |
| 707 |
|
|
if (png_ptr->current_buffer_size) |
| 708 |
|
|
{ |
| 709 |
|
|
png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, |
| 710 |
|
|
png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); |
| 711 |
|
|
png_ptr->save_buffer_size += png_ptr->current_buffer_size; |
| 712 |
|
|
png_ptr->current_buffer_size = 0; |
| 713 |
|
|
} |
| 714 |
|
|
png_ptr->save_buffer_ptr = png_ptr->save_buffer; |
| 715 |
|
|
png_ptr->buffer_size = 0; |
| 716 |
|
|
} |
| 717 |
|
|
|
| 718 |
|
|
void /* PRIVATE */ |
| 719 |
|
|
png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, |
| 720 |
|
|
png_size_t buffer_length) |
| 721 |
|
|
{ |
| 722 |
|
|
png_ptr->current_buffer = buffer; |
| 723 |
|
|
png_ptr->current_buffer_size = buffer_length; |
| 724 |
|
|
png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; |
| 725 |
|
|
png_ptr->current_buffer_ptr = png_ptr->current_buffer; |
| 726 |
|
|
} |
| 727 |
|
|
|
| 728 |
|
|
void /* PRIVATE */ |
| 729 |
|
|
png_push_read_IDAT(png_structp png_ptr) |
| 730 |
|
|
{ |
| 731 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 732 |
|
|
PNG_CONST PNG_IDAT; |
| 733 |
|
|
#endif |
| 734 |
|
|
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 735 |
|
|
{ |
| 736 |
|
|
png_byte chunk_length[4]; |
| 737 |
|
|
|
| 738 |
|
|
if (png_ptr->buffer_size < 8) |
| 739 |
|
|
{ |
| 740 |
|
|
png_push_save_buffer(png_ptr); |
| 741 |
|
|
return; |
| 742 |
|
|
} |
| 743 |
|
|
|
| 744 |
|
|
png_push_fill_buffer(png_ptr, chunk_length, 4); |
| 745 |
|
|
png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
| 746 |
|
|
png_reset_crc(png_ptr); |
| 747 |
|
|
png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 748 |
|
|
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 749 |
|
|
|
| 750 |
|
|
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 751 |
|
|
{ |
| 752 |
|
|
png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 753 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 754 |
|
|
png_error(png_ptr, "Not enough compressed data"); |
| 755 |
|
|
return; |
| 756 |
|
|
} |
| 757 |
|
|
|
| 758 |
|
|
png_ptr->idat_size = png_ptr->push_length; |
| 759 |
|
|
} |
| 760 |
|
|
if (png_ptr->idat_size && png_ptr->save_buffer_size) |
| 761 |
|
|
{ |
| 762 |
|
|
png_size_t save_size; |
| 763 |
|
|
|
| 764 |
|
|
if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) |
| 765 |
|
|
{ |
| 766 |
|
|
save_size = (png_size_t)png_ptr->idat_size; |
| 767 |
|
|
|
| 768 |
|
|
/* Check for overflow */ |
| 769 |
|
|
if ((png_uint_32)save_size != png_ptr->idat_size) |
| 770 |
|
|
png_error(png_ptr, "save_size overflowed in pngpread"); |
| 771 |
|
|
} |
| 772 |
|
|
else |
| 773 |
|
|
save_size = png_ptr->save_buffer_size; |
| 774 |
|
|
|
| 775 |
|
|
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 776 |
|
|
|
| 777 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 778 |
|
|
png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 779 |
|
|
|
| 780 |
|
|
png_ptr->idat_size -= save_size; |
| 781 |
|
|
png_ptr->buffer_size -= save_size; |
| 782 |
|
|
png_ptr->save_buffer_size -= save_size; |
| 783 |
|
|
png_ptr->save_buffer_ptr += save_size; |
| 784 |
|
|
} |
| 785 |
|
|
if (png_ptr->idat_size && png_ptr->current_buffer_size) |
| 786 |
|
|
{ |
| 787 |
|
|
png_size_t save_size; |
| 788 |
|
|
|
| 789 |
|
|
if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) |
| 790 |
|
|
{ |
| 791 |
|
|
save_size = (png_size_t)png_ptr->idat_size; |
| 792 |
|
|
|
| 793 |
|
|
/* Check for overflow */ |
| 794 |
|
|
if ((png_uint_32)save_size != png_ptr->idat_size) |
| 795 |
|
|
png_error(png_ptr, "save_size overflowed in pngpread"); |
| 796 |
|
|
} |
| 797 |
|
|
else |
| 798 |
|
|
save_size = png_ptr->current_buffer_size; |
| 799 |
|
|
|
| 800 |
|
|
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 801 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 802 |
|
|
png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 803 |
|
|
|
| 804 |
|
|
png_ptr->idat_size -= save_size; |
| 805 |
|
|
png_ptr->buffer_size -= save_size; |
| 806 |
|
|
png_ptr->current_buffer_size -= save_size; |
| 807 |
|
|
png_ptr->current_buffer_ptr += save_size; |
| 808 |
|
|
} |
| 809 |
|
|
if (!png_ptr->idat_size) |
| 810 |
|
|
{ |
| 811 |
|
|
if (png_ptr->buffer_size < 4) |
| 812 |
|
|
{ |
| 813 |
|
|
png_push_save_buffer(png_ptr); |
| 814 |
|
|
return; |
| 815 |
|
|
} |
| 816 |
|
|
|
| 817 |
|
|
png_crc_finish(png_ptr, 0); |
| 818 |
|
|
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 819 |
|
|
png_ptr->mode |= PNG_AFTER_IDAT; |
| 820 |
|
|
} |
| 821 |
|
|
} |
| 822 |
|
|
|
| 823 |
|
|
void /* PRIVATE */ |
| 824 |
|
|
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, |
| 825 |
|
|
png_size_t buffer_length) |
| 826 |
|
|
{ |
| 827 |
|
|
int ret; |
| 828 |
|
|
|
| 829 |
|
|
if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length) |
| 830 |
|
|
png_error(png_ptr, "Extra compression data"); |
| 831 |
|
|
|
| 832 |
|
|
png_ptr->zstream.next_in = buffer; |
| 833 |
|
|
png_ptr->zstream.avail_in = (uInt)buffer_length; |
| 834 |
|
|
for (;;) |
| 835 |
|
|
{ |
| 836 |
|
|
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 837 |
|
|
if (ret != Z_OK) |
| 838 |
|
|
{ |
| 839 |
|
|
if (ret == Z_STREAM_END) |
| 840 |
|
|
{ |
| 841 |
|
|
if (png_ptr->zstream.avail_in) |
| 842 |
|
|
png_error(png_ptr, "Extra compressed data"); |
| 843 |
|
|
|
| 844 |
|
|
if (!(png_ptr->zstream.avail_out)) |
| 845 |
|
|
{ |
| 846 |
|
|
png_push_process_row(png_ptr); |
| 847 |
|
|
} |
| 848 |
|
|
|
| 849 |
|
|
png_ptr->mode |= PNG_AFTER_IDAT; |
| 850 |
|
|
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 851 |
|
|
break; |
| 852 |
|
|
} |
| 853 |
|
|
else if (ret == Z_BUF_ERROR) |
| 854 |
|
|
break; |
| 855 |
|
|
|
| 856 |
|
|
else |
| 857 |
|
|
png_error(png_ptr, "Decompression Error"); |
| 858 |
|
|
} |
| 859 |
|
|
if (!(png_ptr->zstream.avail_out)) |
| 860 |
|
|
{ |
| 861 |
|
|
if (( |
| 862 |
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 863 |
|
|
png_ptr->interlaced && png_ptr->pass > 6) || |
| 864 |
|
|
(!png_ptr->interlaced && |
| 865 |
|
|
#endif |
| 866 |
|
|
png_ptr->row_number == png_ptr->num_rows)) |
| 867 |
|
|
{ |
| 868 |
|
|
if (png_ptr->zstream.avail_in) |
| 869 |
|
|
png_warning(png_ptr, "Too much data in IDAT chunks"); |
| 870 |
|
|
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 871 |
|
|
break; |
| 872 |
|
|
} |
| 873 |
|
|
png_push_process_row(png_ptr); |
| 874 |
|
|
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 875 |
|
|
png_ptr->zstream.next_out = png_ptr->row_buf; |
| 876 |
|
|
} |
| 877 |
|
|
|
| 878 |
|
|
else |
| 879 |
|
|
break; |
| 880 |
|
|
} |
| 881 |
|
|
} |
| 882 |
|
|
|
| 883 |
|
|
void /* PRIVATE */ |
| 884 |
|
|
png_push_process_row(png_structp png_ptr) |
| 885 |
|
|
{ |
| 886 |
|
|
png_ptr->row_info.color_type = png_ptr->color_type; |
| 887 |
|
|
png_ptr->row_info.width = png_ptr->iwidth; |
| 888 |
|
|
png_ptr->row_info.channels = png_ptr->channels; |
| 889 |
|
|
png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 890 |
|
|
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 891 |
|
|
|
| 892 |
|
|
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 893 |
|
|
png_ptr->row_info.width); |
| 894 |
|
|
|
| 895 |
|
|
png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 896 |
|
|
png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 897 |
|
|
(int)(png_ptr->row_buf[0])); |
| 898 |
|
|
|
| 899 |
|
|
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 900 |
|
|
png_ptr->rowbytes + 1); |
| 901 |
|
|
|
| 902 |
|
|
if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
| 903 |
|
|
png_do_read_transformations(png_ptr); |
| 904 |
|
|
|
| 905 |
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 906 |
|
|
/* Blow up interlaced rows to full size */ |
| 907 |
|
|
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 908 |
|
|
{ |
| 909 |
|
|
if (png_ptr->pass < 6) |
| 910 |
|
|
/* old interface (pre-1.0.9): |
| 911 |
|
|
png_do_read_interlace(&(png_ptr->row_info), |
| 912 |
|
|
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| 913 |
|
|
*/ |
| 914 |
|
|
png_do_read_interlace(png_ptr); |
| 915 |
|
|
|
| 916 |
|
|
switch (png_ptr->pass) |
| 917 |
|
|
{ |
| 918 |
|
|
case 0: |
| 919 |
|
|
{ |
| 920 |
|
|
int i; |
| 921 |
|
|
for (i = 0; i < 8 && png_ptr->pass == 0; i++) |
| 922 |
|
|
{ |
| 923 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 924 |
|
|
png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */ |
| 925 |
|
|
} |
| 926 |
|
|
|
| 927 |
|
|
if (png_ptr->pass == 2) /* Pass 1 might be empty */ |
| 928 |
|
|
{ |
| 929 |
|
|
for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 930 |
|
|
{ |
| 931 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 932 |
|
|
png_read_push_finish_row(png_ptr); |
| 933 |
|
|
} |
| 934 |
|
|
} |
| 935 |
|
|
|
| 936 |
|
|
if (png_ptr->pass == 4 && png_ptr->height <= 4) |
| 937 |
|
|
{ |
| 938 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 939 |
|
|
{ |
| 940 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 941 |
|
|
png_read_push_finish_row(png_ptr); |
| 942 |
|
|
} |
| 943 |
|
|
} |
| 944 |
|
|
|
| 945 |
|
|
if (png_ptr->pass == 6 && png_ptr->height <= 4) |
| 946 |
|
|
{ |
| 947 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 948 |
|
|
png_read_push_finish_row(png_ptr); |
| 949 |
|
|
} |
| 950 |
|
|
|
| 951 |
|
|
break; |
| 952 |
|
|
} |
| 953 |
|
|
|
| 954 |
|
|
case 1: |
| 955 |
|
|
{ |
| 956 |
|
|
int i; |
| 957 |
|
|
for (i = 0; i < 8 && png_ptr->pass == 1; i++) |
| 958 |
|
|
{ |
| 959 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 960 |
|
|
png_read_push_finish_row(png_ptr); |
| 961 |
|
|
} |
| 962 |
|
|
|
| 963 |
|
|
if (png_ptr->pass == 2) /* Skip top 4 generated rows */ |
| 964 |
|
|
{ |
| 965 |
|
|
for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 966 |
|
|
{ |
| 967 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 968 |
|
|
png_read_push_finish_row(png_ptr); |
| 969 |
|
|
} |
| 970 |
|
|
} |
| 971 |
|
|
|
| 972 |
|
|
break; |
| 973 |
|
|
} |
| 974 |
|
|
|
| 975 |
|
|
case 2: |
| 976 |
|
|
{ |
| 977 |
|
|
int i; |
| 978 |
|
|
|
| 979 |
|
|
for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 980 |
|
|
{ |
| 981 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 982 |
|
|
png_read_push_finish_row(png_ptr); |
| 983 |
|
|
} |
| 984 |
|
|
|
| 985 |
|
|
for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 986 |
|
|
{ |
| 987 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 988 |
|
|
png_read_push_finish_row(png_ptr); |
| 989 |
|
|
} |
| 990 |
|
|
|
| 991 |
|
|
if (png_ptr->pass == 4) /* Pass 3 might be empty */ |
| 992 |
|
|
{ |
| 993 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 994 |
|
|
{ |
| 995 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 996 |
|
|
png_read_push_finish_row(png_ptr); |
| 997 |
|
|
} |
| 998 |
|
|
} |
| 999 |
|
|
|
| 1000 |
|
|
break; |
| 1001 |
|
|
} |
| 1002 |
|
|
|
| 1003 |
|
|
case 3: |
| 1004 |
|
|
{ |
| 1005 |
|
|
int i; |
| 1006 |
|
|
|
| 1007 |
|
|
for (i = 0; i < 4 && png_ptr->pass == 3; i++) |
| 1008 |
|
|
{ |
| 1009 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1010 |
|
|
png_read_push_finish_row(png_ptr); |
| 1011 |
|
|
} |
| 1012 |
|
|
|
| 1013 |
|
|
if (png_ptr->pass == 4) /* Skip top two generated rows */ |
| 1014 |
|
|
{ |
| 1015 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1016 |
|
|
{ |
| 1017 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 1018 |
|
|
png_read_push_finish_row(png_ptr); |
| 1019 |
|
|
} |
| 1020 |
|
|
} |
| 1021 |
|
|
|
| 1022 |
|
|
break; |
| 1023 |
|
|
} |
| 1024 |
|
|
|
| 1025 |
|
|
case 4: |
| 1026 |
|
|
{ |
| 1027 |
|
|
int i; |
| 1028 |
|
|
|
| 1029 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1030 |
|
|
{ |
| 1031 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1032 |
|
|
png_read_push_finish_row(png_ptr); |
| 1033 |
|
|
} |
| 1034 |
|
|
|
| 1035 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1036 |
|
|
{ |
| 1037 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 1038 |
|
|
png_read_push_finish_row(png_ptr); |
| 1039 |
|
|
} |
| 1040 |
|
|
|
| 1041 |
|
|
if (png_ptr->pass == 6) /* Pass 5 might be empty */ |
| 1042 |
|
|
{ |
| 1043 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 1044 |
|
|
png_read_push_finish_row(png_ptr); |
| 1045 |
|
|
} |
| 1046 |
|
|
|
| 1047 |
|
|
break; |
| 1048 |
|
|
} |
| 1049 |
|
|
|
| 1050 |
|
|
case 5: |
| 1051 |
|
|
{ |
| 1052 |
|
|
int i; |
| 1053 |
|
|
|
| 1054 |
|
|
for (i = 0; i < 2 && png_ptr->pass == 5; i++) |
| 1055 |
|
|
{ |
| 1056 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1057 |
|
|
png_read_push_finish_row(png_ptr); |
| 1058 |
|
|
} |
| 1059 |
|
|
|
| 1060 |
|
|
if (png_ptr->pass == 6) /* Skip top generated row */ |
| 1061 |
|
|
{ |
| 1062 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 1063 |
|
|
png_read_push_finish_row(png_ptr); |
| 1064 |
|
|
} |
| 1065 |
|
|
|
| 1066 |
|
|
break; |
| 1067 |
|
|
} |
| 1068 |
|
|
case 6: |
| 1069 |
|
|
{ |
| 1070 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1071 |
|
|
png_read_push_finish_row(png_ptr); |
| 1072 |
|
|
|
| 1073 |
|
|
if (png_ptr->pass != 6) |
| 1074 |
|
|
break; |
| 1075 |
|
|
|
| 1076 |
|
|
png_push_have_row(png_ptr, png_bytep_NULL); |
| 1077 |
|
|
png_read_push_finish_row(png_ptr); |
| 1078 |
|
|
} |
| 1079 |
|
|
} |
| 1080 |
|
|
} |
| 1081 |
|
|
else |
| 1082 |
|
|
#endif |
| 1083 |
|
|
{ |
| 1084 |
|
|
png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1085 |
|
|
png_read_push_finish_row(png_ptr); |
| 1086 |
|
|
} |
| 1087 |
|
|
} |
| 1088 |
|
|
|
| 1089 |
|
|
void /* PRIVATE */ |
| 1090 |
|
|
png_read_push_finish_row(png_structp png_ptr) |
| 1091 |
|
|
{ |
| 1092 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 1093 |
|
|
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 1094 |
|
|
|
| 1095 |
|
|
/* Start of interlace block */ |
| 1096 |
|
|
PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
| 1097 |
|
|
|
| 1098 |
|
|
/* Offset to next interlace block */ |
| 1099 |
|
|
PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1100 |
|
|
|
| 1101 |
|
|
/* Start of interlace block in the y direction */ |
| 1102 |
|
|
PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
| 1103 |
|
|
|
| 1104 |
|
|
/* Offset to next interlace block in the y direction */ |
| 1105 |
|
|
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
| 1106 |
|
|
|
| 1107 |
|
|
/* Height of interlace block. This is not currently used - if you need |
| 1108 |
|
|
* it, uncomment it here and in png.h |
| 1109 |
|
|
PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1110 |
|
|
*/ |
| 1111 |
|
|
#endif |
| 1112 |
|
|
|
| 1113 |
|
|
png_ptr->row_number++; |
| 1114 |
|
|
if (png_ptr->row_number < png_ptr->num_rows) |
| 1115 |
|
|
return; |
| 1116 |
|
|
|
| 1117 |
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 1118 |
|
|
if (png_ptr->interlaced) |
| 1119 |
|
|
{ |
| 1120 |
|
|
png_ptr->row_number = 0; |
| 1121 |
|
|
png_memset_check(png_ptr, png_ptr->prev_row, 0, |
| 1122 |
|
|
png_ptr->rowbytes + 1); |
| 1123 |
|
|
do |
| 1124 |
|
|
{ |
| 1125 |
|
|
png_ptr->pass++; |
| 1126 |
|
|
if ((png_ptr->pass == 1 && png_ptr->width < 5) || |
| 1127 |
|
|
(png_ptr->pass == 3 && png_ptr->width < 3) || |
| 1128 |
|
|
(png_ptr->pass == 5 && png_ptr->width < 2)) |
| 1129 |
|
|
png_ptr->pass++; |
| 1130 |
|
|
|
| 1131 |
|
|
if (png_ptr->pass > 7) |
| 1132 |
|
|
png_ptr->pass--; |
| 1133 |
|
|
|
| 1134 |
|
|
if (png_ptr->pass >= 7) |
| 1135 |
|
|
break; |
| 1136 |
|
|
|
| 1137 |
|
|
png_ptr->iwidth = (png_ptr->width + |
| 1138 |
|
|
png_pass_inc[png_ptr->pass] - 1 - |
| 1139 |
|
|
png_pass_start[png_ptr->pass]) / |
| 1140 |
|
|
png_pass_inc[png_ptr->pass]; |
| 1141 |
|
|
|
| 1142 |
|
|
png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, |
| 1143 |
|
|
png_ptr->iwidth) + 1; |
| 1144 |
|
|
|
| 1145 |
|
|
if (png_ptr->transformations & PNG_INTERLACE) |
| 1146 |
|
|
break; |
| 1147 |
|
|
|
| 1148 |
|
|
png_ptr->num_rows = (png_ptr->height + |
| 1149 |
|
|
png_pass_yinc[png_ptr->pass] - 1 - |
| 1150 |
|
|
png_pass_ystart[png_ptr->pass]) / |
| 1151 |
|
|
png_pass_yinc[png_ptr->pass]; |
| 1152 |
|
|
|
| 1153 |
|
|
} while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); |
| 1154 |
|
|
} |
| 1155 |
|
|
#endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| 1156 |
|
|
} |
| 1157 |
|
|
|
| 1158 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 1159 |
|
|
void /* PRIVATE */ |
| 1160 |
|
|
png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1161 |
|
|
length) |
| 1162 |
|
|
{ |
| 1163 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1164 |
|
|
{ |
| 1165 |
|
|
png_error(png_ptr, "Out of place tEXt"); |
| 1166 |
|
|
info_ptr = info_ptr; /* To quiet some compiler warnings */ |
| 1167 |
|
|
} |
| 1168 |
|
|
|
| 1169 |
|
|
#ifdef PNG_MAX_MALLOC_64K |
| 1170 |
|
|
png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1171 |
|
|
|
| 1172 |
|
|
if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1173 |
|
|
{ |
| 1174 |
|
|
png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 1175 |
|
|
png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1176 |
|
|
length = (png_uint_32)65535L; |
| 1177 |
|
|
} |
| 1178 |
|
|
#endif |
| 1179 |
|
|
|
| 1180 |
|
|
png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
| 1181 |
|
|
(png_uint_32)(length + 1)); |
| 1182 |
|
|
png_ptr->current_text[length] = '\0'; |
| 1183 |
|
|
png_ptr->current_text_ptr = png_ptr->current_text; |
| 1184 |
|
|
png_ptr->current_text_size = (png_size_t)length; |
| 1185 |
|
|
png_ptr->current_text_left = (png_size_t)length; |
| 1186 |
|
|
png_ptr->process_mode = PNG_READ_tEXt_MODE; |
| 1187 |
|
|
} |
| 1188 |
|
|
|
| 1189 |
|
|
void /* PRIVATE */ |
| 1190 |
|
|
png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) |
| 1191 |
|
|
{ |
| 1192 |
|
|
if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1193 |
|
|
{ |
| 1194 |
|
|
png_size_t text_size; |
| 1195 |
|
|
|
| 1196 |
|
|
if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1197 |
|
|
text_size = png_ptr->buffer_size; |
| 1198 |
|
|
|
| 1199 |
|
|
else |
| 1200 |
|
|
text_size = png_ptr->current_text_left; |
| 1201 |
|
|
|
| 1202 |
|
|
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1203 |
|
|
png_ptr->current_text_left -= text_size; |
| 1204 |
|
|
png_ptr->current_text_ptr += text_size; |
| 1205 |
|
|
} |
| 1206 |
|
|
if (!(png_ptr->current_text_left)) |
| 1207 |
|
|
{ |
| 1208 |
|
|
png_textp text_ptr; |
| 1209 |
|
|
png_charp text; |
| 1210 |
|
|
png_charp key; |
| 1211 |
|
|
int ret; |
| 1212 |
|
|
|
| 1213 |
|
|
if (png_ptr->buffer_size < 4) |
| 1214 |
|
|
{ |
| 1215 |
|
|
png_push_save_buffer(png_ptr); |
| 1216 |
|
|
return; |
| 1217 |
|
|
} |
| 1218 |
|
|
|
| 1219 |
|
|
png_push_crc_finish(png_ptr); |
| 1220 |
|
|
|
| 1221 |
|
|
#if defined(PNG_MAX_MALLOC_64K) |
| 1222 |
|
|
if (png_ptr->skip_length) |
| 1223 |
|
|
return; |
| 1224 |
|
|
#endif |
| 1225 |
|
|
|
| 1226 |
|
|
key = png_ptr->current_text; |
| 1227 |
|
|
|
| 1228 |
|
|
for (text = key; *text; text++) |
| 1229 |
|
|
/* Empty loop */ ; |
| 1230 |
|
|
|
| 1231 |
|
|
if (text < key + png_ptr->current_text_size) |
| 1232 |
|
|
text++; |
| 1233 |
|
|
|
| 1234 |
|
|
text_ptr = (png_textp)png_malloc(png_ptr, |
| 1235 |
|
|
(png_uint_32)png_sizeof(png_text)); |
| 1236 |
|
|
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 1237 |
|
|
text_ptr->key = key; |
| 1238 |
|
|
#ifdef PNG_iTXt_SUPPORTED |
| 1239 |
|
|
text_ptr->lang = NULL; |
| 1240 |
|
|
text_ptr->lang_key = NULL; |
| 1241 |
|
|
#endif |
| 1242 |
|
|
text_ptr->text = text; |
| 1243 |
|
|
|
| 1244 |
|
|
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1245 |
|
|
|
| 1246 |
|
|
png_free(png_ptr, key); |
| 1247 |
|
|
png_free(png_ptr, text_ptr); |
| 1248 |
|
|
png_ptr->current_text = NULL; |
| 1249 |
|
|
|
| 1250 |
|
|
if (ret) |
| 1251 |
|
|
png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1252 |
|
|
} |
| 1253 |
|
|
} |
| 1254 |
|
|
#endif |
| 1255 |
|
|
|
| 1256 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 1257 |
|
|
void /* PRIVATE */ |
| 1258 |
|
|
png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1259 |
|
|
length) |
| 1260 |
|
|
{ |
| 1261 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1262 |
|
|
{ |
| 1263 |
|
|
png_error(png_ptr, "Out of place zTXt"); |
| 1264 |
|
|
info_ptr = info_ptr; /* To quiet some compiler warnings */ |
| 1265 |
|
|
} |
| 1266 |
|
|
|
| 1267 |
|
|
#ifdef PNG_MAX_MALLOC_64K |
| 1268 |
|
|
/* We can't handle zTXt chunks > 64K, since we don't have enough space |
| 1269 |
|
|
* to be able to store the uncompressed data. Actually, the threshold |
| 1270 |
|
|
* is probably around 32K, but it isn't as definite as 64K is. |
| 1271 |
|
|
*/ |
| 1272 |
|
|
if (length > (png_uint_32)65535L) |
| 1273 |
|
|
{ |
| 1274 |
|
|
png_warning(png_ptr, "zTXt chunk too large to fit in memory"); |
| 1275 |
|
|
png_push_crc_skip(png_ptr, length); |
| 1276 |
|
|
return; |
| 1277 |
|
|
} |
| 1278 |
|
|
#endif |
| 1279 |
|
|
|
| 1280 |
|
|
png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
| 1281 |
|
|
(png_uint_32)(length + 1)); |
| 1282 |
|
|
png_ptr->current_text[length] = '\0'; |
| 1283 |
|
|
png_ptr->current_text_ptr = png_ptr->current_text; |
| 1284 |
|
|
png_ptr->current_text_size = (png_size_t)length; |
| 1285 |
|
|
png_ptr->current_text_left = (png_size_t)length; |
| 1286 |
|
|
png_ptr->process_mode = PNG_READ_zTXt_MODE; |
| 1287 |
|
|
} |
| 1288 |
|
|
|
| 1289 |
|
|
void /* PRIVATE */ |
| 1290 |
|
|
png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) |
| 1291 |
|
|
{ |
| 1292 |
|
|
if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1293 |
|
|
{ |
| 1294 |
|
|
png_size_t text_size; |
| 1295 |
|
|
|
| 1296 |
|
|
if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) |
| 1297 |
|
|
text_size = png_ptr->buffer_size; |
| 1298 |
|
|
|
| 1299 |
|
|
else |
| 1300 |
|
|
text_size = png_ptr->current_text_left; |
| 1301 |
|
|
|
| 1302 |
|
|
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1303 |
|
|
png_ptr->current_text_left -= text_size; |
| 1304 |
|
|
png_ptr->current_text_ptr += text_size; |
| 1305 |
|
|
} |
| 1306 |
|
|
if (!(png_ptr->current_text_left)) |
| 1307 |
|
|
{ |
| 1308 |
|
|
png_textp text_ptr; |
| 1309 |
|
|
png_charp text; |
| 1310 |
|
|
png_charp key; |
| 1311 |
|
|
int ret; |
| 1312 |
|
|
png_size_t text_size, key_size; |
| 1313 |
|
|
|
| 1314 |
|
|
if (png_ptr->buffer_size < 4) |
| 1315 |
|
|
{ |
| 1316 |
|
|
png_push_save_buffer(png_ptr); |
| 1317 |
|
|
return; |
| 1318 |
|
|
} |
| 1319 |
|
|
|
| 1320 |
|
|
png_push_crc_finish(png_ptr); |
| 1321 |
|
|
|
| 1322 |
|
|
key = png_ptr->current_text; |
| 1323 |
|
|
|
| 1324 |
|
|
for (text = key; *text; text++) |
| 1325 |
|
|
/* Empty loop */ ; |
| 1326 |
|
|
|
| 1327 |
|
|
/* zTXt can't have zero text */ |
| 1328 |
|
|
if (text >= key + png_ptr->current_text_size) |
| 1329 |
|
|
{ |
| 1330 |
|
|
png_ptr->current_text = NULL; |
| 1331 |
|
|
png_free(png_ptr, key); |
| 1332 |
|
|
return; |
| 1333 |
|
|
} |
| 1334 |
|
|
|
| 1335 |
|
|
text++; |
| 1336 |
|
|
|
| 1337 |
|
|
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ |
| 1338 |
|
|
{ |
| 1339 |
|
|
png_ptr->current_text = NULL; |
| 1340 |
|
|
png_free(png_ptr, key); |
| 1341 |
|
|
return; |
| 1342 |
|
|
} |
| 1343 |
|
|
|
| 1344 |
|
|
text++; |
| 1345 |
|
|
|
| 1346 |
|
|
png_ptr->zstream.next_in = (png_bytep )text; |
| 1347 |
|
|
png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - |
| 1348 |
|
|
(text - key)); |
| 1349 |
|
|
png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1350 |
|
|
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1351 |
|
|
|
| 1352 |
|
|
key_size = text - key; |
| 1353 |
|
|
text_size = 0; |
| 1354 |
|
|
text = NULL; |
| 1355 |
|
|
ret = Z_STREAM_END; |
| 1356 |
|
|
|
| 1357 |
|
|
while (png_ptr->zstream.avail_in) |
| 1358 |
|
|
{ |
| 1359 |
|
|
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 1360 |
|
|
if (ret != Z_OK && ret != Z_STREAM_END) |
| 1361 |
|
|
{ |
| 1362 |
|
|
inflateReset(&png_ptr->zstream); |
| 1363 |
|
|
png_ptr->zstream.avail_in = 0; |
| 1364 |
|
|
png_ptr->current_text = NULL; |
| 1365 |
|
|
png_free(png_ptr, key); |
| 1366 |
|
|
png_free(png_ptr, text); |
| 1367 |
|
|
return; |
| 1368 |
|
|
} |
| 1369 |
|
|
if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) |
| 1370 |
|
|
{ |
| 1371 |
|
|
if (text == NULL) |
| 1372 |
|
|
{ |
| 1373 |
|
|
text = (png_charp)png_malloc(png_ptr, |
| 1374 |
|
|
(png_uint_32)(png_ptr->zbuf_size |
| 1375 |
|
|
- png_ptr->zstream.avail_out + key_size + 1)); |
| 1376 |
|
|
|
| 1377 |
|
|
png_memcpy(text + key_size, png_ptr->zbuf, |
| 1378 |
|
|
png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 1379 |
|
|
|
| 1380 |
|
|
png_memcpy(text, key, key_size); |
| 1381 |
|
|
|
| 1382 |
|
|
text_size = key_size + png_ptr->zbuf_size - |
| 1383 |
|
|
png_ptr->zstream.avail_out; |
| 1384 |
|
|
|
| 1385 |
|
|
*(text + text_size) = '\0'; |
| 1386 |
|
|
} |
| 1387 |
|
|
else |
| 1388 |
|
|
{ |
| 1389 |
|
|
png_charp tmp; |
| 1390 |
|
|
|
| 1391 |
|
|
tmp = text; |
| 1392 |
|
|
text = (png_charp)png_malloc(png_ptr, text_size + |
| 1393 |
|
|
(png_uint_32)(png_ptr->zbuf_size |
| 1394 |
|
|
- png_ptr->zstream.avail_out + 1)); |
| 1395 |
|
|
|
| 1396 |
|
|
png_memcpy(text, tmp, text_size); |
| 1397 |
|
|
png_free(png_ptr, tmp); |
| 1398 |
|
|
|
| 1399 |
|
|
png_memcpy(text + text_size, png_ptr->zbuf, |
| 1400 |
|
|
png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 1401 |
|
|
|
| 1402 |
|
|
text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 1403 |
|
|
*(text + text_size) = '\0'; |
| 1404 |
|
|
} |
| 1405 |
|
|
if (ret != Z_STREAM_END) |
| 1406 |
|
|
{ |
| 1407 |
|
|
png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1408 |
|
|
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1409 |
|
|
} |
| 1410 |
|
|
} |
| 1411 |
|
|
else |
| 1412 |
|
|
{ |
| 1413 |
|
|
break; |
| 1414 |
|
|
} |
| 1415 |
|
|
|
| 1416 |
|
|
if (ret == Z_STREAM_END) |
| 1417 |
|
|
break; |
| 1418 |
|
|
} |
| 1419 |
|
|
|
| 1420 |
|
|
inflateReset(&png_ptr->zstream); |
| 1421 |
|
|
png_ptr->zstream.avail_in = 0; |
| 1422 |
|
|
|
| 1423 |
|
|
if (ret != Z_STREAM_END) |
| 1424 |
|
|
{ |
| 1425 |
|
|
png_ptr->current_text = NULL; |
| 1426 |
|
|
png_free(png_ptr, key); |
| 1427 |
|
|
png_free(png_ptr, text); |
| 1428 |
|
|
return; |
| 1429 |
|
|
} |
| 1430 |
|
|
|
| 1431 |
|
|
png_ptr->current_text = NULL; |
| 1432 |
|
|
png_free(png_ptr, key); |
| 1433 |
|
|
key = text; |
| 1434 |
|
|
text += key_size; |
| 1435 |
|
|
|
| 1436 |
|
|
text_ptr = (png_textp)png_malloc(png_ptr, |
| 1437 |
|
|
(png_uint_32)png_sizeof(png_text)); |
| 1438 |
|
|
text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; |
| 1439 |
|
|
text_ptr->key = key; |
| 1440 |
|
|
#ifdef PNG_iTXt_SUPPORTED |
| 1441 |
|
|
text_ptr->lang = NULL; |
| 1442 |
|
|
text_ptr->lang_key = NULL; |
| 1443 |
|
|
#endif |
| 1444 |
|
|
text_ptr->text = text; |
| 1445 |
|
|
|
| 1446 |
|
|
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1447 |
|
|
|
| 1448 |
|
|
png_free(png_ptr, key); |
| 1449 |
|
|
png_free(png_ptr, text_ptr); |
| 1450 |
|
|
|
| 1451 |
|
|
if (ret) |
| 1452 |
|
|
png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1453 |
|
|
} |
| 1454 |
|
|
} |
| 1455 |
|
|
#endif |
| 1456 |
|
|
|
| 1457 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 1458 |
|
|
void /* PRIVATE */ |
| 1459 |
|
|
png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1460 |
|
|
length) |
| 1461 |
|
|
{ |
| 1462 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1463 |
|
|
{ |
| 1464 |
|
|
png_error(png_ptr, "Out of place iTXt"); |
| 1465 |
|
|
info_ptr = info_ptr; /* To quiet some compiler warnings */ |
| 1466 |
|
|
} |
| 1467 |
|
|
|
| 1468 |
|
|
#ifdef PNG_MAX_MALLOC_64K |
| 1469 |
|
|
png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1470 |
|
|
|
| 1471 |
|
|
if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1472 |
|
|
{ |
| 1473 |
|
|
png_warning(png_ptr, "iTXt chunk too large to fit in memory"); |
| 1474 |
|
|
png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1475 |
|
|
length = (png_uint_32)65535L; |
| 1476 |
|
|
} |
| 1477 |
|
|
#endif |
| 1478 |
|
|
|
| 1479 |
|
|
png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
| 1480 |
|
|
(png_uint_32)(length + 1)); |
| 1481 |
|
|
png_ptr->current_text[length] = '\0'; |
| 1482 |
|
|
png_ptr->current_text_ptr = png_ptr->current_text; |
| 1483 |
|
|
png_ptr->current_text_size = (png_size_t)length; |
| 1484 |
|
|
png_ptr->current_text_left = (png_size_t)length; |
| 1485 |
|
|
png_ptr->process_mode = PNG_READ_iTXt_MODE; |
| 1486 |
|
|
} |
| 1487 |
|
|
|
| 1488 |
|
|
void /* PRIVATE */ |
| 1489 |
|
|
png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) |
| 1490 |
|
|
{ |
| 1491 |
|
|
|
| 1492 |
|
|
if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1493 |
|
|
{ |
| 1494 |
|
|
png_size_t text_size; |
| 1495 |
|
|
|
| 1496 |
|
|
if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1497 |
|
|
text_size = png_ptr->buffer_size; |
| 1498 |
|
|
|
| 1499 |
|
|
else |
| 1500 |
|
|
text_size = png_ptr->current_text_left; |
| 1501 |
|
|
|
| 1502 |
|
|
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1503 |
|
|
png_ptr->current_text_left -= text_size; |
| 1504 |
|
|
png_ptr->current_text_ptr += text_size; |
| 1505 |
|
|
} |
| 1506 |
|
|
if (!(png_ptr->current_text_left)) |
| 1507 |
|
|
{ |
| 1508 |
|
|
png_textp text_ptr; |
| 1509 |
|
|
png_charp key; |
| 1510 |
|
|
int comp_flag; |
| 1511 |
|
|
png_charp lang; |
| 1512 |
|
|
png_charp lang_key; |
| 1513 |
|
|
png_charp text; |
| 1514 |
|
|
int ret; |
| 1515 |
|
|
|
| 1516 |
|
|
if (png_ptr->buffer_size < 4) |
| 1517 |
|
|
{ |
| 1518 |
|
|
png_push_save_buffer(png_ptr); |
| 1519 |
|
|
return; |
| 1520 |
|
|
} |
| 1521 |
|
|
|
| 1522 |
|
|
png_push_crc_finish(png_ptr); |
| 1523 |
|
|
|
| 1524 |
|
|
#if defined(PNG_MAX_MALLOC_64K) |
| 1525 |
|
|
if (png_ptr->skip_length) |
| 1526 |
|
|
return; |
| 1527 |
|
|
#endif |
| 1528 |
|
|
|
| 1529 |
|
|
key = png_ptr->current_text; |
| 1530 |
|
|
|
| 1531 |
|
|
for (lang = key; *lang; lang++) |
| 1532 |
|
|
/* Empty loop */ ; |
| 1533 |
|
|
|
| 1534 |
|
|
if (lang < key + png_ptr->current_text_size - 3) |
| 1535 |
|
|
lang++; |
| 1536 |
|
|
|
| 1537 |
|
|
comp_flag = *lang++; |
| 1538 |
|
|
lang++; /* Skip comp_type, always zero */ |
| 1539 |
|
|
|
| 1540 |
|
|
for (lang_key = lang; *lang_key; lang_key++) |
| 1541 |
|
|
/* Empty loop */ ; |
| 1542 |
|
|
|
| 1543 |
|
|
lang_key++; /* Skip NUL separator */ |
| 1544 |
|
|
|
| 1545 |
|
|
text=lang_key; |
| 1546 |
|
|
|
| 1547 |
|
|
if (lang_key < key + png_ptr->current_text_size - 1) |
| 1548 |
|
|
{ |
| 1549 |
|
|
for (; *text; text++) |
| 1550 |
|
|
/* Empty loop */ ; |
| 1551 |
|
|
} |
| 1552 |
|
|
|
| 1553 |
|
|
if (text < key + png_ptr->current_text_size) |
| 1554 |
|
|
text++; |
| 1555 |
|
|
|
| 1556 |
|
|
text_ptr = (png_textp)png_malloc(png_ptr, |
| 1557 |
|
|
(png_uint_32)png_sizeof(png_text)); |
| 1558 |
|
|
|
| 1559 |
|
|
text_ptr->compression = comp_flag + 2; |
| 1560 |
|
|
text_ptr->key = key; |
| 1561 |
|
|
text_ptr->lang = lang; |
| 1562 |
|
|
text_ptr->lang_key = lang_key; |
| 1563 |
|
|
text_ptr->text = text; |
| 1564 |
|
|
text_ptr->text_length = 0; |
| 1565 |
|
|
text_ptr->itxt_length = png_strlen(text); |
| 1566 |
|
|
|
| 1567 |
|
|
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1568 |
|
|
|
| 1569 |
|
|
png_ptr->current_text = NULL; |
| 1570 |
|
|
|
| 1571 |
|
|
png_free(png_ptr, text_ptr); |
| 1572 |
|
|
if (ret) |
| 1573 |
|
|
png_warning(png_ptr, "Insufficient memory to store iTXt chunk."); |
| 1574 |
|
|
} |
| 1575 |
|
|
} |
| 1576 |
|
|
#endif |
| 1577 |
|
|
|
| 1578 |
|
|
/* This function is called when we haven't found a handler for this |
| 1579 |
|
|
* chunk. If there isn't a problem with the chunk itself (ie a bad chunk |
| 1580 |
|
|
* name or a critical chunk), the chunk is (currently) silently ignored. |
| 1581 |
|
|
*/ |
| 1582 |
|
|
void /* PRIVATE */ |
| 1583 |
|
|
png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1584 |
|
|
length) |
| 1585 |
|
|
{ |
| 1586 |
|
|
png_uint_32 skip = 0; |
| 1587 |
|
|
|
| 1588 |
|
|
if (!(png_ptr->chunk_name[0] & 0x20)) |
| 1589 |
|
|
{ |
| 1590 |
|
|
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
| 1591 |
|
|
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 1592 |
|
|
PNG_HANDLE_CHUNK_ALWAYS |
| 1593 |
|
|
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
| 1594 |
|
|
&& png_ptr->read_user_chunk_fn == NULL |
| 1595 |
|
|
#endif |
| 1596 |
|
|
) |
| 1597 |
|
|
#endif |
| 1598 |
|
|
png_chunk_error(png_ptr, "unknown critical chunk"); |
| 1599 |
|
|
|
| 1600 |
|
|
info_ptr = info_ptr; /* To quiet some compiler warnings */ |
| 1601 |
|
|
} |
| 1602 |
|
|
|
| 1603 |
|
|
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
| 1604 |
|
|
if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
| 1605 |
|
|
{ |
| 1606 |
|
|
#ifdef PNG_MAX_MALLOC_64K |
| 1607 |
|
|
if (length > (png_uint_32)65535L) |
| 1608 |
|
|
{ |
| 1609 |
|
|
png_warning(png_ptr, "unknown chunk too large to fit in memory"); |
| 1610 |
|
|
skip = length - (png_uint_32)65535L; |
| 1611 |
|
|
length = (png_uint_32)65535L; |
| 1612 |
|
|
} |
| 1613 |
|
|
#endif |
| 1614 |
|
|
png_memcpy((png_charp)png_ptr->unknown_chunk.name, |
| 1615 |
|
|
(png_charp)png_ptr->chunk_name, |
| 1616 |
|
|
png_sizeof(png_ptr->unknown_chunk.name)); |
| 1617 |
|
|
png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] |
| 1618 |
|
|
= '\0'; |
| 1619 |
|
|
|
| 1620 |
|
|
png_ptr->unknown_chunk.size = (png_size_t)length; |
| 1621 |
|
|
|
| 1622 |
|
|
if (length == 0) |
| 1623 |
|
|
png_ptr->unknown_chunk.data = NULL; |
| 1624 |
|
|
|
| 1625 |
|
|
else |
| 1626 |
|
|
{ |
| 1627 |
|
|
png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, |
| 1628 |
|
|
(png_uint_32)length); |
| 1629 |
|
|
png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); |
| 1630 |
|
|
} |
| 1631 |
|
|
|
| 1632 |
|
|
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
| 1633 |
|
|
if (png_ptr->read_user_chunk_fn != NULL) |
| 1634 |
|
|
{ |
| 1635 |
|
|
/* Callback to user unknown chunk handler */ |
| 1636 |
|
|
int ret; |
| 1637 |
|
|
ret = (*(png_ptr->read_user_chunk_fn)) |
| 1638 |
|
|
(png_ptr, &png_ptr->unknown_chunk); |
| 1639 |
|
|
|
| 1640 |
|
|
if (ret < 0) |
| 1641 |
|
|
png_chunk_error(png_ptr, "error in user chunk"); |
| 1642 |
|
|
|
| 1643 |
|
|
if (ret == 0) |
| 1644 |
|
|
{ |
| 1645 |
|
|
if (!(png_ptr->chunk_name[0] & 0x20)) |
| 1646 |
|
|
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 1647 |
|
|
PNG_HANDLE_CHUNK_ALWAYS) |
| 1648 |
|
|
png_chunk_error(png_ptr, "unknown critical chunk"); |
| 1649 |
|
|
png_set_unknown_chunks(png_ptr, info_ptr, |
| 1650 |
|
|
&png_ptr->unknown_chunk, 1); |
| 1651 |
|
|
} |
| 1652 |
|
|
} |
| 1653 |
|
|
|
| 1654 |
|
|
else |
| 1655 |
|
|
#endif |
| 1656 |
|
|
png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); |
| 1657 |
|
|
png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 1658 |
|
|
png_ptr->unknown_chunk.data = NULL; |
| 1659 |
|
|
} |
| 1660 |
|
|
|
| 1661 |
|
|
else |
| 1662 |
|
|
#endif |
| 1663 |
|
|
skip=length; |
| 1664 |
|
|
png_push_crc_skip(png_ptr, skip); |
| 1665 |
|
|
} |
| 1666 |
|
|
|
| 1667 |
|
|
void /* PRIVATE */ |
| 1668 |
|
|
png_push_have_info(png_structp png_ptr, png_infop info_ptr) |
| 1669 |
|
|
{ |
| 1670 |
|
|
if (png_ptr->info_fn != NULL) |
| 1671 |
|
|
(*(png_ptr->info_fn))(png_ptr, info_ptr); |
| 1672 |
|
|
} |
| 1673 |
|
|
|
| 1674 |
|
|
void /* PRIVATE */ |
| 1675 |
|
|
png_push_have_end(png_structp png_ptr, png_infop info_ptr) |
| 1676 |
|
|
{ |
| 1677 |
|
|
if (png_ptr->end_fn != NULL) |
| 1678 |
|
|
(*(png_ptr->end_fn))(png_ptr, info_ptr); |
| 1679 |
|
|
} |
| 1680 |
|
|
|
| 1681 |
|
|
void /* PRIVATE */ |
| 1682 |
|
|
png_push_have_row(png_structp png_ptr, png_bytep row) |
| 1683 |
|
|
{ |
| 1684 |
|
|
if (png_ptr->row_fn != NULL) |
| 1685 |
|
|
(*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, |
| 1686 |
|
|
(int)png_ptr->pass); |
| 1687 |
|
|
} |
| 1688 |
|
|
|
| 1689 |
|
|
void PNGAPI |
| 1690 |
|
|
png_progressive_combine_row (png_structp png_ptr, |
| 1691 |
|
|
png_bytep old_row, png_bytep new_row) |
| 1692 |
|
|
{ |
| 1693 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 1694 |
|
|
PNG_CONST int FARDATA png_pass_dsp_mask[7] = |
| 1695 |
|
|
{0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 1696 |
|
|
#endif |
| 1697 |
|
|
if (png_ptr == NULL) |
| 1698 |
|
|
return; |
| 1699 |
|
|
|
| 1700 |
|
|
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ |
| 1701 |
|
|
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); |
| 1702 |
|
|
} |
| 1703 |
|
|
|
| 1704 |
|
|
void PNGAPI |
| 1705 |
|
|
png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, |
| 1706 |
|
|
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1707 |
|
|
png_progressive_end_ptr end_fn) |
| 1708 |
|
|
{ |
| 1709 |
|
|
if (png_ptr == NULL) |
| 1710 |
|
|
return; |
| 1711 |
|
|
|
| 1712 |
|
|
png_ptr->info_fn = info_fn; |
| 1713 |
|
|
png_ptr->row_fn = row_fn; |
| 1714 |
|
|
png_ptr->end_fn = end_fn; |
| 1715 |
|
|
|
| 1716 |
|
|
png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); |
| 1717 |
|
|
} |
| 1718 |
|
|
|
| 1719 |
|
|
png_voidp PNGAPI |
| 1720 |
|
|
png_get_progressive_ptr(png_structp png_ptr) |
| 1721 |
|
|
{ |
| 1722 |
|
|
if (png_ptr == NULL) |
| 1723 |
|
|
return (NULL); |
| 1724 |
|
|
|
| 1725 |
|
|
return png_ptr->io_ptr; |
| 1726 |
|
|
} |
| 1727 |
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
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