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00014 #define PNG_INTERNAL
00015 #include "png.h"
00016
00017
00018 png_structp PNGAPI
00019 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
00020 png_error_ptr error_fn, png_error_ptr warn_fn)
00021 {
00022
00023 #ifdef PNG_USER_MEM_SUPPORTED
00024 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
00025 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
00026 }
00027
00028
00029 png_structp PNGAPI
00030 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
00031 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
00032 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
00033 {
00034 #endif
00035
00036 png_structp png_ptr;
00037
00038 #ifdef PNG_SETJMP_SUPPORTED
00039 #ifdef USE_FAR_KEYWORD
00040 jmp_buf jmpbuf;
00041 #endif
00042 #endif
00043
00044 int i;
00045
00046 png_debug(1, "in png_create_read_struct\n");
00047 #ifdef PNG_USER_MEM_SUPPORTED
00048 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
00049 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
00050 #else
00051 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
00052 #endif
00053 if (png_ptr == NULL)
00054 return (NULL);
00055
00056 #if !defined(PNG_1_0_X)
00057 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
00058 png_init_mmx_flags(png_ptr);
00059 #endif
00060 #endif
00061
00062
00063 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
00064 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
00065 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
00066 #endif
00067
00068 #ifdef PNG_SETJMP_SUPPORTED
00069 #ifdef USE_FAR_KEYWORD
00070 if (setjmp(jmpbuf))
00071 #else
00072 if (setjmp(png_ptr->jmpbuf))
00073 #endif
00074 {
00075 png_free(png_ptr, png_ptr->zbuf);
00076 png_ptr->zbuf=NULL;
00077 #ifdef PNG_USER_MEM_SUPPORTED
00078 png_destroy_struct_2((png_voidp)png_ptr,
00079 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
00080 #else
00081 png_destroy_struct((png_voidp)png_ptr);
00082 #endif
00083 return (NULL);
00084 }
00085 #ifdef USE_FAR_KEYWORD
00086 png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
00087 #endif
00088 #endif
00089
00090 #ifdef PNG_USER_MEM_SUPPORTED
00091 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
00092 #endif
00093
00094 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
00095
00096 i=0;
00097 do
00098 {
00099 if(user_png_ver[i] != png_libpng_ver[i])
00100 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
00101 } while (png_libpng_ver[i++]);
00102
00103 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
00104 {
00105
00106
00107
00108
00109
00110 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
00111 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
00112 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
00113 {
00114 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
00115 char msg[80];
00116 if (user_png_ver)
00117 {
00118 sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
00119 user_png_ver);
00120 png_warning(png_ptr, msg);
00121 }
00122 sprintf(msg, "Application is running with png.c from libpng-%.20s",
00123 png_libpng_ver);
00124 png_warning(png_ptr, msg);
00125 #endif
00126 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
00127 png_ptr->flags=0;
00128 #endif
00129 png_error(png_ptr,
00130 "Incompatible libpng version in application and library");
00131 }
00132 }
00133
00134
00135 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
00136 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
00137 (png_uint_32)png_ptr->zbuf_size);
00138 png_ptr->zstream.zalloc = png_zalloc;
00139 png_ptr->zstream.zfree = png_zfree;
00140 png_ptr->zstream.opaque = (voidpf)png_ptr;
00141
00142 switch (inflateInit(&png_ptr->zstream))
00143 {
00144 case Z_OK: break;
00145 case Z_MEM_ERROR:
00146 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
00147 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
00148 default: png_error(png_ptr, "Unknown zlib error");
00149 }
00150
00151 png_ptr->zstream.next_out = png_ptr->zbuf;
00152 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
00153
00154 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
00155
00156 #ifdef PNG_SETJMP_SUPPORTED
00157
00158
00159
00160 #ifdef USE_FAR_KEYWORD
00161 if (setjmp(jmpbuf))
00162 PNG_ABORT();
00163 png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
00164 #else
00165 if (setjmp(png_ptr->jmpbuf))
00166 PNG_ABORT();
00167 #endif
00168 #endif
00169 return (png_ptr);
00170 }
00171
00172
00173
00174
00175 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
00176 #undef png_read_init
00177 void PNGAPI
00178 png_read_init(png_structp png_ptr)
00179 {
00180
00181 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
00182 }
00183 #endif
00184
00185 void PNGAPI
00186 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
00187 png_size_t png_struct_size, png_size_t png_info_size)
00188 {
00189
00190 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
00191 if(png_sizeof(png_struct) > png_struct_size ||
00192 png_sizeof(png_info) > png_info_size)
00193 {
00194 char msg[80];
00195 png_ptr->warning_fn=NULL;
00196 if (user_png_ver)
00197 {
00198 sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
00199 user_png_ver);
00200 png_warning(png_ptr, msg);
00201 }
00202 sprintf(msg, "Application is running with png.c from libpng-%.20s",
00203 png_libpng_ver);
00204 png_warning(png_ptr, msg);
00205 }
00206 #endif
00207 if(png_sizeof(png_struct) > png_struct_size)
00208 {
00209 png_ptr->error_fn=NULL;
00210 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
00211 png_ptr->flags=0;
00212 #endif
00213 png_error(png_ptr,
00214 "The png struct allocated by the application for reading is too small.");
00215 }
00216 if(png_sizeof(png_info) > png_info_size)
00217 {
00218 png_ptr->error_fn=NULL;
00219 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
00220 png_ptr->flags=0;
00221 #endif
00222 png_error(png_ptr,
00223 "The info struct allocated by application for reading is too small.");
00224 }
00225 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
00226 }
00227
00228 void PNGAPI
00229 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
00230 png_size_t png_struct_size)
00231 {
00232 #ifdef PNG_SETJMP_SUPPORTED
00233 jmp_buf tmp_jmp;
00234 #endif
00235
00236 int i=0;
00237
00238 png_structp png_ptr=*ptr_ptr;
00239
00240 do
00241 {
00242 if(user_png_ver[i] != png_libpng_ver[i])
00243 {
00244 #ifdef PNG_LEGACY_SUPPORTED
00245 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
00246 #else
00247 png_ptr->warning_fn=NULL;
00248 png_warning(png_ptr,
00249 "Application uses deprecated png_read_init() and should be recompiled.");
00250 break;
00251 #endif
00252 }
00253 } while (png_libpng_ver[i++]);
00254
00255 png_debug(1, "in png_read_init_3\n");
00256
00257 #ifdef PNG_SETJMP_SUPPORTED
00258
00259 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
00260 #endif
00261
00262 if(png_sizeof(png_struct) > png_struct_size)
00263 {
00264 png_destroy_struct(png_ptr);
00265 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
00266 png_ptr = *ptr_ptr;
00267 }
00268
00269
00270 png_memset(png_ptr, 0, png_sizeof (png_struct));
00271
00272 #ifdef PNG_SETJMP_SUPPORTED
00273
00274 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
00275 #endif
00276
00277
00278 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
00279 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
00280 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
00281 #endif
00282
00283
00284 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
00285 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
00286 (png_uint_32)png_ptr->zbuf_size);
00287 png_ptr->zstream.zalloc = png_zalloc;
00288 png_ptr->zstream.zfree = png_zfree;
00289 png_ptr->zstream.opaque = (voidpf)png_ptr;
00290
00291 switch (inflateInit(&png_ptr->zstream))
00292 {
00293 case Z_OK: break;
00294 case Z_MEM_ERROR:
00295 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
00296 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
00297 default: png_error(png_ptr, "Unknown zlib error");
00298 }
00299
00300 png_ptr->zstream.next_out = png_ptr->zbuf;
00301 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
00302
00303 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
00304 }
00305
00306 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00307
00308
00309
00310
00311
00312
00313
00314
00315 void PNGAPI
00316 png_read_info(png_structp png_ptr, png_infop info_ptr)
00317 {
00318 png_debug(1, "in png_read_info\n");
00319
00320 if (png_ptr->sig_bytes < 8)
00321 {
00322 png_size_t num_checked = png_ptr->sig_bytes,
00323 num_to_check = 8 - num_checked;
00324
00325 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
00326 png_ptr->sig_bytes = 8;
00327
00328 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
00329 {
00330 if (num_checked < 4 &&
00331 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
00332 png_error(png_ptr, "Not a PNG file");
00333 else
00334 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
00335 }
00336 if (num_checked < 3)
00337 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
00338 }
00339
00340 for(;;)
00341 {
00342 #ifdef PNG_USE_LOCAL_ARRAYS
00343 PNG_IHDR;
00344 PNG_IDAT;
00345 PNG_IEND;
00346 PNG_PLTE;
00347 #if defined(PNG_READ_bKGD_SUPPORTED)
00348 PNG_bKGD;
00349 #endif
00350 #if defined(PNG_READ_cHRM_SUPPORTED)
00351 PNG_cHRM;
00352 #endif
00353 #if defined(PNG_READ_gAMA_SUPPORTED)
00354 PNG_gAMA;
00355 #endif
00356 #if defined(PNG_READ_hIST_SUPPORTED)
00357 PNG_hIST;
00358 #endif
00359 #if defined(PNG_READ_iCCP_SUPPORTED)
00360 PNG_iCCP;
00361 #endif
00362 #if defined(PNG_READ_iTXt_SUPPORTED)
00363 PNG_iTXt;
00364 #endif
00365 #if defined(PNG_READ_oFFs_SUPPORTED)
00366 PNG_oFFs;
00367 #endif
00368 #if defined(PNG_READ_pCAL_SUPPORTED)
00369 PNG_pCAL;
00370 #endif
00371 #if defined(PNG_READ_pHYs_SUPPORTED)
00372 PNG_pHYs;
00373 #endif
00374 #if defined(PNG_READ_sBIT_SUPPORTED)
00375 PNG_sBIT;
00376 #endif
00377 #if defined(PNG_READ_sCAL_SUPPORTED)
00378 PNG_sCAL;
00379 #endif
00380 #if defined(PNG_READ_sPLT_SUPPORTED)
00381 PNG_sPLT;
00382 #endif
00383 #if defined(PNG_READ_sRGB_SUPPORTED)
00384 PNG_sRGB;
00385 #endif
00386 #if defined(PNG_READ_tEXt_SUPPORTED)
00387 PNG_tEXt;
00388 #endif
00389 #if defined(PNG_READ_tIME_SUPPORTED)
00390 PNG_tIME;
00391 #endif
00392 #if defined(PNG_READ_tRNS_SUPPORTED)
00393 PNG_tRNS;
00394 #endif
00395 #if defined(PNG_READ_zTXt_SUPPORTED)
00396 PNG_zTXt;
00397 #endif
00398 #endif
00399 png_byte chunk_length[4];
00400 png_uint_32 length;
00401
00402 png_read_data(png_ptr, chunk_length, 4);
00403 length = png_get_uint_31(png_ptr,chunk_length);
00404
00405 png_reset_crc(png_ptr);
00406 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
00407
00408 png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
00409 length);
00410
00411
00412
00413
00414 if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
00415 png_handle_IHDR(png_ptr, info_ptr, length);
00416 else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
00417 png_handle_IEND(png_ptr, info_ptr, length);
00418 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
00419 else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
00420 {
00421 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00422 png_ptr->mode |= PNG_HAVE_IDAT;
00423 png_handle_unknown(png_ptr, info_ptr, length);
00424 if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
00425 png_ptr->mode |= PNG_HAVE_PLTE;
00426 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00427 {
00428 if (!(png_ptr->mode & PNG_HAVE_IHDR))
00429 png_error(png_ptr, "Missing IHDR before IDAT");
00430 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
00431 !(png_ptr->mode & PNG_HAVE_PLTE))
00432 png_error(png_ptr, "Missing PLTE before IDAT");
00433 break;
00434 }
00435 }
00436 #endif
00437 else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
00438 png_handle_PLTE(png_ptr, info_ptr, length);
00439 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00440 {
00441 if (!(png_ptr->mode & PNG_HAVE_IHDR))
00442 png_error(png_ptr, "Missing IHDR before IDAT");
00443 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
00444 !(png_ptr->mode & PNG_HAVE_PLTE))
00445 png_error(png_ptr, "Missing PLTE before IDAT");
00446
00447 png_ptr->idat_size = length;
00448 png_ptr->mode |= PNG_HAVE_IDAT;
00449 break;
00450 }
00451 #if defined(PNG_READ_bKGD_SUPPORTED)
00452 else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
00453 png_handle_bKGD(png_ptr, info_ptr, length);
00454 #endif
00455 #if defined(PNG_READ_cHRM_SUPPORTED)
00456 else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
00457 png_handle_cHRM(png_ptr, info_ptr, length);
00458 #endif
00459 #if defined(PNG_READ_gAMA_SUPPORTED)
00460 else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
00461 png_handle_gAMA(png_ptr, info_ptr, length);
00462 #endif
00463 #if defined(PNG_READ_hIST_SUPPORTED)
00464 else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
00465 png_handle_hIST(png_ptr, info_ptr, length);
00466 #endif
00467 #if defined(PNG_READ_oFFs_SUPPORTED)
00468 else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
00469 png_handle_oFFs(png_ptr, info_ptr, length);
00470 #endif
00471 #if defined(PNG_READ_pCAL_SUPPORTED)
00472 else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
00473 png_handle_pCAL(png_ptr, info_ptr, length);
00474 #endif
00475 #if defined(PNG_READ_sCAL_SUPPORTED)
00476 else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
00477 png_handle_sCAL(png_ptr, info_ptr, length);
00478 #endif
00479 #if defined(PNG_READ_pHYs_SUPPORTED)
00480 else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
00481 png_handle_pHYs(png_ptr, info_ptr, length);
00482 #endif
00483 #if defined(PNG_READ_sBIT_SUPPORTED)
00484 else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
00485 png_handle_sBIT(png_ptr, info_ptr, length);
00486 #endif
00487 #if defined(PNG_READ_sRGB_SUPPORTED)
00488 else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
00489 png_handle_sRGB(png_ptr, info_ptr, length);
00490 #endif
00491 #if defined(PNG_READ_iCCP_SUPPORTED)
00492 else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
00493 png_handle_iCCP(png_ptr, info_ptr, length);
00494 #endif
00495 #if defined(PNG_READ_sPLT_SUPPORTED)
00496 else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
00497 png_handle_sPLT(png_ptr, info_ptr, length);
00498 #endif
00499 #if defined(PNG_READ_tEXt_SUPPORTED)
00500 else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
00501 png_handle_tEXt(png_ptr, info_ptr, length);
00502 #endif
00503 #if defined(PNG_READ_tIME_SUPPORTED)
00504 else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
00505 png_handle_tIME(png_ptr, info_ptr, length);
00506 #endif
00507 #if defined(PNG_READ_tRNS_SUPPORTED)
00508 else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
00509 png_handle_tRNS(png_ptr, info_ptr, length);
00510 #endif
00511 #if defined(PNG_READ_zTXt_SUPPORTED)
00512 else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
00513 png_handle_zTXt(png_ptr, info_ptr, length);
00514 #endif
00515 #if defined(PNG_READ_iTXt_SUPPORTED)
00516 else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
00517 png_handle_iTXt(png_ptr, info_ptr, length);
00518 #endif
00519 else
00520 png_handle_unknown(png_ptr, info_ptr, length);
00521 }
00522 }
00523 #endif
00524
00525
00526 void PNGAPI
00527 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
00528 {
00529 png_debug(1, "in png_read_update_info\n");
00530 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
00531 png_read_start_row(png_ptr);
00532 else
00533 png_warning(png_ptr,
00534 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
00535 png_read_transform_info(png_ptr, info_ptr);
00536 }
00537
00538 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00539
00540
00541
00542
00543
00544 void PNGAPI
00545 png_start_read_image(png_structp png_ptr)
00546 {
00547 png_debug(1, "in png_start_read_image\n");
00548 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
00549 png_read_start_row(png_ptr);
00550 }
00551 #endif
00552
00553 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00554 void PNGAPI
00555 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
00556 {
00557 #ifdef PNG_USE_LOCAL_ARRAYS
00558 PNG_IDAT;
00559 const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
00560 const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
00561 #endif
00562 int ret;
00563 png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
00564 png_ptr->row_number, png_ptr->pass);
00565 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
00566 png_read_start_row(png_ptr);
00567 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
00568 {
00569
00570 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
00571 if (png_ptr->transformations & PNG_INVERT_MONO)
00572 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
00573 #endif
00574 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
00575 if (png_ptr->transformations & PNG_FILLER)
00576 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
00577 #endif
00578 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
00579 if (png_ptr->transformations & PNG_PACKSWAP)
00580 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
00581 #endif
00582 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
00583 if (png_ptr->transformations & PNG_PACK)
00584 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
00585 #endif
00586 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
00587 if (png_ptr->transformations & PNG_SHIFT)
00588 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
00589 #endif
00590 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
00591 if (png_ptr->transformations & PNG_BGR)
00592 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
00593 #endif
00594 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
00595 if (png_ptr->transformations & PNG_SWAP_BYTES)
00596 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
00597 #endif
00598 }
00599
00600 #if defined(PNG_READ_INTERLACING_SUPPORTED)
00601
00602 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
00603 {
00604 switch (png_ptr->pass)
00605 {
00606 case 0:
00607 if (png_ptr->row_number & 0x07)
00608 {
00609 if (dsp_row != NULL)
00610 png_combine_row(png_ptr, dsp_row,
00611 png_pass_dsp_mask[png_ptr->pass]);
00612 png_read_finish_row(png_ptr);
00613 return;
00614 }
00615 break;
00616 case 1:
00617 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
00618 {
00619 if (dsp_row != NULL)
00620 png_combine_row(png_ptr, dsp_row,
00621 png_pass_dsp_mask[png_ptr->pass]);
00622 png_read_finish_row(png_ptr);
00623 return;
00624 }
00625 break;
00626 case 2:
00627 if ((png_ptr->row_number & 0x07) != 4)
00628 {
00629 if (dsp_row != NULL && (png_ptr->row_number & 4))
00630 png_combine_row(png_ptr, dsp_row,
00631 png_pass_dsp_mask[png_ptr->pass]);
00632 png_read_finish_row(png_ptr);
00633 return;
00634 }
00635 break;
00636 case 3:
00637 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
00638 {
00639 if (dsp_row != NULL)
00640 png_combine_row(png_ptr, dsp_row,
00641 png_pass_dsp_mask[png_ptr->pass]);
00642 png_read_finish_row(png_ptr);
00643 return;
00644 }
00645 break;
00646 case 4:
00647 if ((png_ptr->row_number & 3) != 2)
00648 {
00649 if (dsp_row != NULL && (png_ptr->row_number & 2))
00650 png_combine_row(png_ptr, dsp_row,
00651 png_pass_dsp_mask[png_ptr->pass]);
00652 png_read_finish_row(png_ptr);
00653 return;
00654 }
00655 break;
00656 case 5:
00657 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
00658 {
00659 if (dsp_row != NULL)
00660 png_combine_row(png_ptr, dsp_row,
00661 png_pass_dsp_mask[png_ptr->pass]);
00662 png_read_finish_row(png_ptr);
00663 return;
00664 }
00665 break;
00666 case 6:
00667 if (!(png_ptr->row_number & 1))
00668 {
00669 png_read_finish_row(png_ptr);
00670 return;
00671 }
00672 break;
00673 }
00674 }
00675 #endif
00676
00677 if (!(png_ptr->mode & PNG_HAVE_IDAT))
00678 png_error(png_ptr, "Invalid attempt to read row data");
00679
00680 png_ptr->zstream.next_out = png_ptr->row_buf;
00681 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
00682 do
00683 {
00684 if (!(png_ptr->zstream.avail_in))
00685 {
00686 while (!png_ptr->idat_size)
00687 {
00688 png_byte chunk_length[4];
00689
00690 png_crc_finish(png_ptr, 0);
00691
00692 png_read_data(png_ptr, chunk_length, 4);
00693 png_ptr->idat_size = png_get_uint_31(png_ptr,chunk_length);
00694
00695 png_reset_crc(png_ptr);
00696 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
00697 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00698 png_error(png_ptr, "Not enough image data");
00699 }
00700 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
00701 png_ptr->zstream.next_in = png_ptr->zbuf;
00702 if (png_ptr->zbuf_size > png_ptr->idat_size)
00703 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
00704 png_crc_read(png_ptr, png_ptr->zbuf,
00705 (png_size_t)png_ptr->zstream.avail_in);
00706 png_ptr->idat_size -= png_ptr->zstream.avail_in;
00707 }
00708 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
00709 if (ret == Z_STREAM_END)
00710 {
00711 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
00712 png_ptr->idat_size)
00713 png_error(png_ptr, "Extra compressed data");
00714 png_ptr->mode |= PNG_AFTER_IDAT;
00715 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
00716 break;
00717 }
00718 if (ret != Z_OK)
00719 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
00720 "Decompression error");
00721
00722 } while (png_ptr->zstream.avail_out);
00723
00724 png_ptr->row_info.color_type = png_ptr->color_type;
00725 png_ptr->row_info.width = png_ptr->iwidth;
00726 png_ptr->row_info.channels = png_ptr->channels;
00727 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
00728 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
00729 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
00730 png_ptr->row_info.width);
00731
00732 if(png_ptr->row_buf[0])
00733 png_read_filter_row(png_ptr, &(png_ptr->row_info),
00734 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
00735 (int)(png_ptr->row_buf[0]));
00736
00737 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
00738 png_ptr->rowbytes + 1);
00739
00740 #if defined(PNG_MNG_FEATURES_SUPPORTED)
00741 if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
00742 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
00743 {
00744
00745 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
00746 }
00747 #endif
00748
00749
00750 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
00751 png_do_read_transformations(png_ptr);
00752
00753 #if defined(PNG_READ_INTERLACING_SUPPORTED)
00754
00755 if (png_ptr->interlaced &&
00756 (png_ptr->transformations & PNG_INTERLACE))
00757 {
00758 if (png_ptr->pass < 6)
00759
00760
00761
00762
00763 png_do_read_interlace(png_ptr);
00764
00765 if (dsp_row != NULL)
00766 png_combine_row(png_ptr, dsp_row,
00767 png_pass_dsp_mask[png_ptr->pass]);
00768 if (row != NULL)
00769 png_combine_row(png_ptr, row,
00770 png_pass_mask[png_ptr->pass]);
00771 }
00772 else
00773 #endif
00774 {
00775 if (row != NULL)
00776 png_combine_row(png_ptr, row, 0xff);
00777 if (dsp_row != NULL)
00778 png_combine_row(png_ptr, dsp_row, 0xff);
00779 }
00780 png_read_finish_row(png_ptr);
00781
00782 if (png_ptr->read_row_fn != NULL)
00783 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
00784 }
00785 #endif
00786
00787 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00788
00789
00790
00791
00792
00793
00794
00795
00796
00797
00798
00799
00800
00801
00802
00803
00804
00805
00806
00807
00808
00809
00810
00811
00812 void PNGAPI
00813 png_read_rows(png_structp png_ptr, png_bytepp row,
00814 png_bytepp display_row, png_uint_32 num_rows)
00815 {
00816 png_uint_32 i;
00817 png_bytepp rp;
00818 png_bytepp dp;
00819
00820 png_debug(1, "in png_read_rows\n");
00821 rp = row;
00822 dp = display_row;
00823 if (rp != NULL && dp != NULL)
00824 for (i = 0; i < num_rows; i++)
00825 {
00826 png_bytep rptr = *rp++;
00827 png_bytep dptr = *dp++;
00828
00829 png_read_row(png_ptr, rptr, dptr);
00830 }
00831 else if(rp != NULL)
00832 for (i = 0; i < num_rows; i++)
00833 {
00834 png_bytep rptr = *rp;
00835 png_read_row(png_ptr, rptr, png_bytep_NULL);
00836 rp++;
00837 }
00838 else if(dp != NULL)
00839 for (i = 0; i < num_rows; i++)
00840 {
00841 png_bytep dptr = *dp;
00842 png_read_row(png_ptr, png_bytep_NULL, dptr);
00843 dp++;
00844 }
00845 }
00846 #endif
00847
00848 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00849
00850
00851
00852
00853
00854
00855
00856
00857
00858
00859
00860
00861 void PNGAPI
00862 png_read_image(png_structp png_ptr, png_bytepp image)
00863 {
00864 png_uint_32 i,image_height;
00865 int pass, j;
00866 png_bytepp rp;
00867
00868 png_debug(1, "in png_read_image\n");
00869
00870 #ifdef PNG_READ_INTERLACING_SUPPORTED
00871 pass = png_set_interlace_handling(png_ptr);
00872 #else
00873 if (png_ptr->interlaced)
00874 png_error(png_ptr,
00875 "Cannot read interlaced image -- interlace handler disabled.");
00876 pass = 1;
00877 #endif
00878
00879
00880 image_height=png_ptr->height;
00881 png_ptr->num_rows = image_height;
00882
00883 for (j = 0; j < pass; j++)
00884 {
00885 rp = image;
00886 for (i = 0; i < image_height; i++)
00887 {
00888 png_read_row(png_ptr, *rp, png_bytep_NULL);
00889 rp++;
00890 }
00891 }
00892 }
00893 #endif
00894
00895 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
00896
00897
00898
00899
00900 void PNGAPI
00901 png_read_end(png_structp png_ptr, png_infop info_ptr)
00902 {
00903 png_byte chunk_length[4];
00904 png_uint_32 length;
00905
00906 png_debug(1, "in png_read_end\n");
00907 png_crc_finish(png_ptr, 0);
00908
00909 do
00910 {
00911 #ifdef PNG_USE_LOCAL_ARRAYS
00912 PNG_IHDR;
00913 PNG_IDAT;
00914 PNG_IEND;
00915 PNG_PLTE;
00916 #if defined(PNG_READ_bKGD_SUPPORTED)
00917 PNG_bKGD;
00918 #endif
00919 #if defined(PNG_READ_cHRM_SUPPORTED)
00920 PNG_cHRM;
00921 #endif
00922 #if defined(PNG_READ_gAMA_SUPPORTED)
00923 PNG_gAMA;
00924 #endif
00925 #if defined(PNG_READ_hIST_SUPPORTED)
00926 PNG_hIST;
00927 #endif
00928 #if defined(PNG_READ_iCCP_SUPPORTED)
00929 PNG_iCCP;
00930 #endif
00931 #if defined(PNG_READ_iTXt_SUPPORTED)
00932 PNG_iTXt;
00933 #endif
00934 #if defined(PNG_READ_oFFs_SUPPORTED)
00935 PNG_oFFs;
00936 #endif
00937 #if defined(PNG_READ_pCAL_SUPPORTED)
00938 PNG_pCAL;
00939 #endif
00940 #if defined(PNG_READ_pHYs_SUPPORTED)
00941 PNG_pHYs;
00942 #endif
00943 #if defined(PNG_READ_sBIT_SUPPORTED)
00944 PNG_sBIT;
00945 #endif
00946 #if defined(PNG_READ_sCAL_SUPPORTED)
00947 PNG_sCAL;
00948 #endif
00949 #if defined(PNG_READ_sPLT_SUPPORTED)
00950 PNG_sPLT;
00951 #endif
00952 #if defined(PNG_READ_sRGB_SUPPORTED)
00953 PNG_sRGB;
00954 #endif
00955 #if defined(PNG_READ_tEXt_SUPPORTED)
00956 PNG_tEXt;
00957 #endif
00958 #if defined(PNG_READ_tIME_SUPPORTED)
00959 PNG_tIME;
00960 #endif
00961 #if defined(PNG_READ_tRNS_SUPPORTED)
00962 PNG_tRNS;
00963 #endif
00964 #if defined(PNG_READ_zTXt_SUPPORTED)
00965 PNG_zTXt;
00966 #endif
00967 #endif
00968
00969 png_read_data(png_ptr, chunk_length, 4);
00970 length = png_get_uint_31(png_ptr,chunk_length);
00971
00972 png_reset_crc(png_ptr);
00973 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
00974
00975 png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
00976
00977 if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
00978 png_handle_IHDR(png_ptr, info_ptr, length);
00979 else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
00980 png_handle_IEND(png_ptr, info_ptr, length);
00981 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
00982 else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
00983 {
00984 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00985 {
00986 if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
00987 png_error(png_ptr, "Too many IDAT's found");
00988 }
00989 else
00990 png_ptr->mode |= PNG_AFTER_IDAT;
00991 png_handle_unknown(png_ptr, info_ptr, length);
00992 if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
00993 png_ptr->mode |= PNG_HAVE_PLTE;
00994 }
00995 #endif
00996 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
00997 {
00998
00999
01000
01001 if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
01002 png_error(png_ptr, "Too many IDAT's found");
01003 png_crc_finish(png_ptr, length);
01004 }
01005 else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
01006 png_handle_PLTE(png_ptr, info_ptr, length);
01007 #if defined(PNG_READ_bKGD_SUPPORTED)
01008 else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
01009 png_handle_bKGD(png_ptr, info_ptr, length);
01010 #endif
01011 #if defined(PNG_READ_cHRM_SUPPORTED)
01012 else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
01013 png_handle_cHRM(png_ptr, info_ptr, length);
01014 #endif
01015 #if defined(PNG_READ_gAMA_SUPPORTED)
01016 else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
01017 png_handle_gAMA(png_ptr, info_ptr, length);
01018 #endif
01019 #if defined(PNG_READ_hIST_SUPPORTED)
01020 else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
01021 png_handle_hIST(png_ptr, info_ptr, length);
01022 #endif
01023 #if defined(PNG_READ_oFFs_SUPPORTED)
01024 else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
01025 png_handle_oFFs(png_ptr, info_ptr, length);
01026 #endif
01027 #if defined(PNG_READ_pCAL_SUPPORTED)
01028 else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
01029 png_handle_pCAL(png_ptr, info_ptr, length);
01030 #endif
01031 #if defined(PNG_READ_sCAL_SUPPORTED)
01032 else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
01033 png_handle_sCAL(png_ptr, info_ptr, length);
01034 #endif
01035 #if defined(PNG_READ_pHYs_SUPPORTED)
01036 else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
01037 png_handle_pHYs(png_ptr, info_ptr, length);
01038 #endif
01039 #if defined(PNG_READ_sBIT_SUPPORTED)
01040 else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
01041 png_handle_sBIT(png_ptr, info_ptr, length);
01042 #endif
01043 #if defined(PNG_READ_sRGB_SUPPORTED)
01044 else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
01045 png_handle_sRGB(png_ptr, info_ptr, length);
01046 #endif
01047 #if defined(PNG_READ_iCCP_SUPPORTED)
01048 else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
01049 png_handle_iCCP(png_ptr, info_ptr, length);
01050 #endif
01051 #if defined(PNG_READ_sPLT_SUPPORTED)
01052 else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
01053 png_handle_sPLT(png_ptr, info_ptr, length);
01054 #endif
01055 #if defined(PNG_READ_tEXt_SUPPORTED)
01056 else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
01057 png_handle_tEXt(png_ptr, info_ptr, length);
01058 #endif
01059 #if defined(PNG_READ_tIME_SUPPORTED)
01060 else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
01061 png_handle_tIME(png_ptr, info_ptr, length);
01062 #endif
01063 #if defined(PNG_READ_tRNS_SUPPORTED)
01064 else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
01065 png_handle_tRNS(png_ptr, info_ptr, length);
01066 #endif
01067 #if defined(PNG_READ_zTXt_SUPPORTED)
01068 else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
01069 png_handle_zTXt(png_ptr, info_ptr, length);
01070 #endif
01071 #if defined(PNG_READ_iTXt_SUPPORTED)
01072 else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
01073 png_handle_iTXt(png_ptr, info_ptr, length);
01074 #endif
01075 else
01076 png_handle_unknown(png_ptr, info_ptr, length);
01077 } while (!(png_ptr->mode & PNG_HAVE_IEND));
01078 }
01079 #endif
01080
01081
01082 void PNGAPI
01083 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
01084 png_infopp end_info_ptr_ptr)
01085 {
01086 png_structp png_ptr = NULL;
01087 png_infop info_ptr = NULL, end_info_ptr = NULL;
01088 #ifdef PNG_USER_MEM_SUPPORTED
01089 png_free_ptr free_fn;
01090 png_voidp mem_ptr;
01091 #endif
01092
01093 png_debug(1, "in png_destroy_read_struct\n");
01094 if (png_ptr_ptr != NULL)
01095 png_ptr = *png_ptr_ptr;
01096
01097 if (info_ptr_ptr != NULL)
01098 info_ptr = *info_ptr_ptr;
01099
01100 if (end_info_ptr_ptr != NULL)
01101 end_info_ptr = *end_info_ptr_ptr;
01102
01103 #ifdef PNG_USER_MEM_SUPPORTED
01104 free_fn = png_ptr->free_fn;
01105 mem_ptr = png_ptr->mem_ptr;
01106 #endif
01107
01108 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
01109
01110 if (info_ptr != NULL)
01111 {
01112 #if defined(PNG_TEXT_SUPPORTED)
01113 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
01114 #endif
01115
01116 #ifdef PNG_USER_MEM_SUPPORTED
01117 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
01118 (png_voidp)mem_ptr);
01119 #else
01120 png_destroy_struct((png_voidp)info_ptr);
01121 #endif
01122 *info_ptr_ptr = NULL;
01123 }
01124
01125 if (end_info_ptr != NULL)
01126 {
01127 #if defined(PNG_READ_TEXT_SUPPORTED)
01128 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
01129 #endif
01130 #ifdef PNG_USER_MEM_SUPPORTED
01131 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
01132 (png_voidp)mem_ptr);
01133 #else
01134 png_destroy_struct((png_voidp)end_info_ptr);
01135 #endif
01136 *end_info_ptr_ptr = NULL;
01137 }
01138
01139 if (png_ptr != NULL)
01140 {
01141 #ifdef PNG_USER_MEM_SUPPORTED
01142 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
01143 (png_voidp)mem_ptr);
01144 #else
01145 png_destroy_struct((png_voidp)png_ptr);
01146 #endif
01147 *png_ptr_ptr = NULL;
01148 }
01149 }
01150
01151
01152 void
01153 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
01154 {
01155 #ifdef PNG_SETJMP_SUPPORTED
01156 jmp_buf tmp_jmp;
01157 #endif
01158 png_error_ptr error_fn;
01159 png_error_ptr warning_fn;
01160 png_voidp error_ptr;
01161 #ifdef PNG_USER_MEM_SUPPORTED
01162 png_free_ptr free_fn;
01163 #endif
01164
01165 png_debug(1, "in png_read_destroy\n");
01166 if (info_ptr != NULL)
01167 png_info_destroy(png_ptr, info_ptr);
01168
01169 if (end_info_ptr != NULL)
01170 png_info_destroy(png_ptr, end_info_ptr);
01171
01172 png_free(png_ptr, png_ptr->zbuf);
01173 png_free(png_ptr, png_ptr->big_row_buf);
01174 png_free(png_ptr, png_ptr->prev_row);
01175 #if defined(PNG_READ_DITHER_SUPPORTED)
01176 png_free(png_ptr, png_ptr->palette_lookup);
01177 png_free(png_ptr, png_ptr->dither_index);
01178 #endif
01179 #if defined(PNG_READ_GAMMA_SUPPORTED)
01180 png_free(png_ptr, png_ptr->gamma_table);
01181 #endif
01182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
01183 png_free(png_ptr, png_ptr->gamma_from_1);
01184 png_free(png_ptr, png_ptr->gamma_to_1);
01185 #endif
01186 #ifdef PNG_FREE_ME_SUPPORTED
01187 if (png_ptr->free_me & PNG_FREE_PLTE)
01188 png_zfree(png_ptr, png_ptr->palette);
01189 png_ptr->free_me &= ~PNG_FREE_PLTE;
01190 #else
01191 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
01192 png_zfree(png_ptr, png_ptr->palette);
01193 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
01194 #endif
01195 #if defined(PNG_tRNS_SUPPORTED) || \
01196 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
01197 #ifdef PNG_FREE_ME_SUPPORTED
01198 if (png_ptr->free_me & PNG_FREE_TRNS)
01199 png_free(png_ptr, png_ptr->trans);
01200 png_ptr->free_me &= ~PNG_FREE_TRNS;
01201 #else
01202 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
01203 png_free(png_ptr, png_ptr->trans);
01204 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
01205 #endif
01206 #endif
01207 #if defined(PNG_READ_hIST_SUPPORTED)
01208 #ifdef PNG_FREE_ME_SUPPORTED
01209 if (png_ptr->free_me & PNG_FREE_HIST)
01210 png_free(png_ptr, png_ptr->hist);
01211 png_ptr->free_me &= ~PNG_FREE_HIST;
01212 #else
01213 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
01214 png_free(png_ptr, png_ptr->hist);
01215 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
01216 #endif
01217 #endif
01218 #if defined(PNG_READ_GAMMA_SUPPORTED)
01219 if (png_ptr->gamma_16_table != NULL)
01220 {
01221 int i;
01222 int istop = (1 << (8 - png_ptr->gamma_shift));
01223 for (i = 0; i < istop; i++)
01224 {
01225 png_free(png_ptr, png_ptr->gamma_16_table[i]);
01226 }
01227 png_free(png_ptr, png_ptr->gamma_16_table);
01228 }
01229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
01230 if (png_ptr->gamma_16_from_1 != NULL)
01231 {
01232 int i;
01233 int istop = (1 << (8 - png_ptr->gamma_shift));
01234 for (i = 0; i < istop; i++)
01235 {
01236 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
01237 }
01238 png_free(png_ptr, png_ptr->gamma_16_from_1);
01239 }
01240 if (png_ptr->gamma_16_to_1 != NULL)
01241 {
01242 int i;
01243 int istop = (1 << (8 - png_ptr->gamma_shift));
01244 for (i = 0; i < istop; i++)
01245 {
01246 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
01247 }
01248 png_free(png_ptr, png_ptr->gamma_16_to_1);
01249 }
01250 #endif
01251 #endif
01252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
01253 png_free(png_ptr, png_ptr->time_buffer);
01254 #endif
01255
01256 inflateEnd(&png_ptr->zstream);
01257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
01258 png_free(png_ptr, png_ptr->save_buffer);
01259 #endif
01260
01261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
01262 #ifdef PNG_TEXT_SUPPORTED
01263 png_free(png_ptr, png_ptr->current_text);
01264 #endif
01265 #endif
01266
01267
01268
01269
01270 #ifdef PNG_SETJMP_SUPPORTED
01271 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
01272 #endif
01273
01274 error_fn = png_ptr->error_fn;
01275 warning_fn = png_ptr->warning_fn;
01276 error_ptr = png_ptr->error_ptr;
01277 #ifdef PNG_USER_MEM_SUPPORTED
01278 free_fn = png_ptr->free_fn;
01279 #endif
01280
01281 png_memset(png_ptr, 0, png_sizeof (png_struct));
01282
01283 png_ptr->error_fn = error_fn;
01284 png_ptr->warning_fn = warning_fn;
01285 png_ptr->error_ptr = error_ptr;
01286 #ifdef PNG_USER_MEM_SUPPORTED
01287 png_ptr->free_fn = free_fn;
01288 #endif
01289
01290 #ifdef PNG_SETJMP_SUPPORTED
01291 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
01292 #endif
01293
01294 }
01295
01296 void PNGAPI
01297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
01298 {
01299 png_ptr->read_row_fn = read_row_fn;
01300 }
01301
01302
01303 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01304 #if defined(PNG_INFO_IMAGE_SUPPORTED)
01305 void PNGAPI
01306 png_read_png(png_structp png_ptr, png_infop info_ptr,
01307 int transforms,
01308 voidp params)
01309 {
01310 int row;
01311
01312 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
01313
01314
01315 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
01316 png_set_invert_alpha(png_ptr);
01317 #endif
01318
01319
01320
01321
01322 png_read_info(png_ptr, info_ptr);
01323 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
01324 png_error(png_ptr,"Image is too high to process with png_read_png()");
01325
01326
01327
01328 #if defined(PNG_READ_16_TO_8_SUPPORTED)
01329
01330
01331 if (transforms & PNG_TRANSFORM_STRIP_16)
01332 png_set_strip_16(png_ptr);
01333 #endif
01334
01335 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
01336
01337
01338
01339 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
01340 png_set_strip_alpha(png_ptr);
01341 #endif
01342
01343 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
01344
01345
01346
01347 if (transforms & PNG_TRANSFORM_PACKING)
01348 png_set_packing(png_ptr);
01349 #endif
01350
01351 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
01352
01353
01354
01355 if (transforms & PNG_TRANSFORM_PACKSWAP)
01356 png_set_packswap(png_ptr);
01357 #endif
01358
01359 #if defined(PNG_READ_EXPAND_SUPPORTED)
01360
01361
01362
01363
01364
01365 if (transforms & PNG_TRANSFORM_EXPAND)
01366 if ((png_ptr->bit_depth < 8) ||
01367 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
01368 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
01369 png_set_expand(png_ptr);
01370 #endif
01371
01372
01373
01374
01375 #if defined(PNG_READ_INVERT_SUPPORTED)
01376
01377
01378 if (transforms & PNG_TRANSFORM_INVERT_MONO)
01379 png_set_invert_mono(png_ptr);
01380 #endif
01381
01382 #if defined(PNG_READ_SHIFT_SUPPORTED)
01383
01384
01385
01386
01387 if ((transforms & PNG_TRANSFORM_SHIFT)
01388 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
01389 {
01390 png_color_8p sig_bit;
01391
01392 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
01393 png_set_shift(png_ptr, sig_bit);
01394 }
01395 #endif
01396
01397 #if defined(PNG_READ_BGR_SUPPORTED)
01398
01399
01400 if (transforms & PNG_TRANSFORM_BGR)
01401 png_set_bgr(png_ptr);
01402 #endif
01403
01404 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
01405
01406
01407 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
01408 png_set_swap_alpha(png_ptr);
01409 #endif
01410
01411 #if defined(PNG_READ_SWAP_SUPPORTED)
01412
01413
01414 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
01415 png_set_swap(png_ptr);
01416 #endif
01417
01418
01419
01420
01421
01422
01423
01424 png_read_update_info(png_ptr, info_ptr);
01425
01426
01427
01428 #ifdef PNG_FREE_ME_SUPPORTED
01429 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
01430 #endif
01431 if(info_ptr->row_pointers == NULL)
01432 {
01433 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
01434 info_ptr->height * png_sizeof(png_bytep));
01435 #ifdef PNG_FREE_ME_SUPPORTED
01436 info_ptr->free_me |= PNG_FREE_ROWS;
01437 #endif
01438 for (row = 0; row < (int)info_ptr->height; row++)
01439 {
01440 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
01441 png_get_rowbytes(png_ptr, info_ptr));
01442 }
01443 }
01444
01445 png_read_image(png_ptr, info_ptr->row_pointers);
01446 info_ptr->valid |= PNG_INFO_IDAT;
01447
01448
01449 png_read_end(png_ptr, info_ptr);
01450
01451 if(transforms == 0 || params == NULL)
01452 return;
01453
01454 }
01455 #endif
01456 #endif