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| 1 /* | |
| 2 * jdmarker.c | |
| 3 * | |
| 4 * Copyright (C) 1991-1998, Thomas G. Lane. | |
| 5 * This file is part of the Independent JPEG Group's software. | |
| 6 * For conditions of distribution and use, see the accompanying README file. | |
| 7 * | |
| 8 * This file contains routines to decode JPEG datastream markers. | |
| 9 * Most of the complexity arises from our desire to support input | |
| 10 * suspension: if not all of the data for a marker is available, | |
| 11 * we must exit back to the application. On resumption, we reprocess | |
| 12 * the marker. | |
| 13 */ | |
| 14 | |
| 15 #define JPEG_INTERNALS | |
| 16 #include "jinclude.h" | |
| 17 #include "jpeglib.h" | |
| 18 | |
| 19 | |
| 20 typedef enum { /* JPEG marker codes */ | |
| 21 M_SOF0 = 0xc0, | |
| 22 M_SOF1 = 0xc1, | |
| 23 M_SOF2 = 0xc2, | |
| 24 M_SOF3 = 0xc3, | |
| 25 | |
| 26 M_SOF5 = 0xc5, | |
| 27 M_SOF6 = 0xc6, | |
| 28 M_SOF7 = 0xc7, | |
| 29 | |
| 30 M_JPG = 0xc8, | |
| 31 M_SOF9 = 0xc9, | |
| 32 M_SOF10 = 0xca, | |
| 33 M_SOF11 = 0xcb, | |
| 34 | |
| 35 M_SOF13 = 0xcd, | |
| 36 M_SOF14 = 0xce, | |
| 37 M_SOF15 = 0xcf, | |
| 38 | |
| 39 M_DHT = 0xc4, | |
| 40 | |
| 41 M_DAC = 0xcc, | |
| 42 | |
| 43 M_RST0 = 0xd0, | |
| 44 M_RST1 = 0xd1, | |
| 45 M_RST2 = 0xd2, | |
| 46 M_RST3 = 0xd3, | |
| 47 M_RST4 = 0xd4, | |
| 48 M_RST5 = 0xd5, | |
| 49 M_RST6 = 0xd6, | |
| 50 M_RST7 = 0xd7, | |
| 51 | |
| 52 M_SOI = 0xd8, | |
| 53 M_EOI = 0xd9, | |
| 54 M_SOS = 0xda, | |
| 55 M_DQT = 0xdb, | |
| 56 M_DNL = 0xdc, | |
| 57 M_DRI = 0xdd, | |
| 58 M_DHP = 0xde, | |
| 59 M_EXP = 0xdf, | |
| 60 | |
| 61 M_APP0 = 0xe0, | |
| 62 M_APP1 = 0xe1, | |
| 63 M_APP2 = 0xe2, | |
| 64 M_APP3 = 0xe3, | |
| 65 M_APP4 = 0xe4, | |
| 66 M_APP5 = 0xe5, | |
| 67 M_APP6 = 0xe6, | |
| 68 M_APP7 = 0xe7, | |
| 69 M_APP8 = 0xe8, | |
| 70 M_APP9 = 0xe9, | |
| 71 M_APP10 = 0xea, | |
| 72 M_APP11 = 0xeb, | |
| 73 M_APP12 = 0xec, | |
| 74 M_APP13 = 0xed, | |
| 75 M_APP14 = 0xee, | |
| 76 M_APP15 = 0xef, | |
| 77 | |
| 78 M_JPG0 = 0xf0, | |
| 79 M_JPG13 = 0xfd, | |
| 80 M_COM = 0xfe, | |
| 81 | |
| 82 M_TEM = 0x01, | |
| 83 | |
| 84 M_ERROR = 0x100 | |
| 85 } JPEG_MARKER; | |
| 86 | |
| 87 | |
| 88 /* Private state */ | |
| 89 | |
| 90 typedef struct { | |
| 91 struct jpeg_marker_reader pub; /* public fields */ | |
| 92 | |
| 93 /* Application-overridable marker processing methods */ | |
| 94 jpeg_marker_parser_method process_COM; | |
| 95 jpeg_marker_parser_method process_APPn[16]; | |
| 96 | |
| 97 /* Limit on marker data length to save for each marker type */ | |
| 98 unsigned int length_limit_COM; | |
| 99 unsigned int length_limit_APPn[16]; | |
| 100 | |
| 101 /* Status of COM/APPn marker saving */ | |
| 102 jpeg_saved_marker_ptr cur_marker; /* NULL if not processing a marker */ | |
| 103 unsigned int bytes_read; /* data bytes read so far in marker */ | |
| 104 /* Note: cur_marker is not linked into marker_list until it's all read. */ | |
| 105 } my_marker_reader; | |
| 106 | |
| 107 typedef my_marker_reader * my_marker_ptr; | |
| 108 | |
| 109 | |
| 110 /* | |
| 111 * Macros for fetching data from the data source module. | |
| 112 * | |
| 113 * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect | |
| 114 * the current restart point; we update them only when we have reached a | |
| 115 * suitable place to restart if a suspension occurs. | |
| 116 */ | |
| 117 | |
| 118 /* Declare and initialize local copies of input pointer/count */ | |
| 119 #define INPUT_VARS(cinfo) \ | |
| 120 struct jpeg_source_mgr * datasrc = (cinfo)->src; \ | |
| 121 const JOCTET * next_input_byte = datasrc->next_input_byte; \ | |
| 122 size_t bytes_in_buffer = datasrc->bytes_in_buffer | |
| 123 | |
| 124 /* Unload the local copies --- do this only at a restart boundary */ | |
| 125 #define INPUT_SYNC(cinfo) \ | |
| 126 ( datasrc->next_input_byte = next_input_byte, \ | |
| 127 datasrc->bytes_in_buffer = bytes_in_buffer ) | |
| 128 | |
| 129 /* Reload the local copies --- used only in MAKE_BYTE_AVAIL */ | |
| 130 #define INPUT_RELOAD(cinfo) \ | |
| 131 ( next_input_byte = datasrc->next_input_byte, \ | |
| 132 bytes_in_buffer = datasrc->bytes_in_buffer ) | |
| 133 | |
| 134 /* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available. | |
| 135 * Note we do *not* do INPUT_SYNC before calling fill_input_buffer, | |
| 136 * but we must reload the local copies after a successful fill. | |
| 137 */ | |
| 138 #define MAKE_BYTE_AVAIL(cinfo,action) \ | |
| 139 if (bytes_in_buffer == 0) { \ | |
| 140 if (! (*datasrc->fill_input_buffer) (cinfo)) \ | |
| 141 { action; } \ | |
| 142 INPUT_RELOAD(cinfo); \ | |
| 143 } | |
| 144 | |
| 145 /* Read a byte into variable V. | |
| 146 * If must suspend, take the specified action (typically "return FALSE"). | |
| 147 */ | |
| 148 #define INPUT_BYTE(cinfo,V,action) \ | |
| 149 MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ | |
| 150 bytes_in_buffer--; \ | |
| 151 V = GETJOCTET(*next_input_byte++); ) | |
| 152 | |
| 153 /* As above, but read two bytes interpreted as an unsigned 16-bit integer. | |
| 154 * V should be declared unsigned int or perhaps INT32. | |
| 155 */ | |
| 156 #define INPUT_2BYTES(cinfo,V,action) \ | |
| 157 MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ | |
| 158 bytes_in_buffer--; \ | |
| 159 V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \ | |
| 160 MAKE_BYTE_AVAIL(cinfo,action); \ | |
| 161 bytes_in_buffer--; \ | |
| 162 V += GETJOCTET(*next_input_byte++); ) | |
| 163 | |
| 164 | |
| 165 /* | |
| 166 * Routines to process JPEG markers. | |
| 167 * | |
| 168 * Entry condition: JPEG marker itself has been read and its code saved | |
| 169 * in cinfo->unread_marker; input restart point is just after the marker. | |
| 170 * | |
| 171 * Exit: if return TRUE, have read and processed any parameters, and have | |
| 172 * updated the restart point to point after the parameters. | |
| 173 * If return FALSE, was forced to suspend before reaching end of | |
| 174 * marker parameters; restart point has not been moved. Same routine | |
| 175 * will be called again after application supplies more input data. | |
| 176 * | |
| 177 * This approach to suspension assumes that all of a marker's parameters | |
| 178 * can fit into a single input bufferload. This should hold for "normal" | |
| 179 * markers. Some COM/APPn markers might have large parameter segments | |
| 180 * that might not fit. If we are simply dropping such a marker, we use | |
| 181 * skip_input_data to get past it, and thereby put the problem on the | |
| 182 * source manager's shoulders. If we are saving the marker's contents | |
| 183 * into memory, we use a slightly different convention: when forced to | |
| 184 * suspend, the marker processor updates the restart point to the end of | |
| 185 * what it's consumed (ie, the end of the buffer) before returning FALSE. | |
| 186 * On resumption, cinfo->unread_marker still contains the marker code, | |
| 187 * but the data source will point to the next chunk of marker data. | |
| 188 * The marker processor must retain internal state to deal with this. | |
| 189 * | |
| 190 * Note that we don't bother to avoid duplicate trace messages if a | |
| 191 * suspension occurs within marker parameters. Other side effects | |
| 192 * require more care. | |
| 193 */ | |
| 194 | |
| 195 | |
| 196 LOCAL(boolean) | |
| 197 get_soi (j_decompress_ptr cinfo) | |
| 198 /* Process an SOI marker */ | |
| 199 { | |
| 200 int i; | |
| 201 | |
| 202 TRACEMS(cinfo, 1, JTRC_SOI); | |
| 203 | |
| 204 if (cinfo->marker->saw_SOI) | |
| 205 ERREXIT(cinfo, JERR_SOI_DUPLICATE); | |
| 206 | |
| 207 /* Reset all parameters that are defined to be reset by SOI */ | |
| 208 | |
| 209 for (i = 0; i < NUM_ARITH_TBLS; i++) { | |
| 210 cinfo->arith_dc_L[i] = 0; | |
| 211 cinfo->arith_dc_U[i] = 1; | |
| 212 cinfo->arith_ac_K[i] = 5; | |
| 213 } | |
| 214 cinfo->restart_interval = 0; | |
| 215 | |
| 216 /* Set initial assumptions for colorspace etc */ | |
| 217 | |
| 218 cinfo->jpeg_color_space = JCS_UNKNOWN; | |
| 219 cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */ | |
| 220 | |
| 221 cinfo->saw_JFIF_marker = FALSE; | |
| 222 cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */ | |
| 223 cinfo->JFIF_minor_version = 1; | |
| 224 cinfo->density_unit = 0; | |
| 225 cinfo->X_density = 1; | |
| 226 cinfo->Y_density = 1; | |
| 227 cinfo->saw_Adobe_marker = FALSE; | |
| 228 cinfo->Adobe_transform = 0; | |
| 229 | |
| 230 cinfo->marker->saw_SOI = TRUE; | |
| 231 | |
| 232 return TRUE; | |
| 233 } | |
| 234 | |
| 235 | |
| 236 LOCAL(boolean) | |
| 237 get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith) | |
| 238 /* Process a SOFn marker */ | |
| 239 { | |
| 240 INT32 length; | |
| 241 int c, ci; | |
| 242 jpeg_component_info * compptr; | |
| 243 INPUT_VARS(cinfo); | |
| 244 | |
| 245 cinfo->progressive_mode = is_prog; | |
| 246 cinfo->arith_code = is_arith; | |
| 247 | |
| 248 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 249 | |
| 250 INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE); | |
| 251 INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE); | |
| 252 INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE); | |
| 253 INPUT_BYTE(cinfo, cinfo->num_components, return FALSE); | |
| 254 | |
| 255 length -= 8; | |
| 256 | |
| 257 TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker, | |
| 258 (int) cinfo->image_width, (int) cinfo->image_height, | |
| 259 cinfo->num_components); | |
| 260 | |
| 261 if (cinfo->marker->saw_SOF) | |
| 262 ERREXIT(cinfo, JERR_SOF_DUPLICATE); | |
| 263 | |
| 264 /* We don't support files in which the image height is initially specified */ | |
| 265 /* as 0 and is later redefined by DNL. As long as we have to check that, */ | |
| 266 /* might as well have a general sanity check. */ | |
| 267 if (cinfo->image_height <= 0 || cinfo->image_width <= 0 | |
| 268 || cinfo->num_components <= 0) | |
| 269 ERREXIT(cinfo, JERR_EMPTY_IMAGE); | |
| 270 | |
| 271 if (length != (cinfo->num_components * 3)) | |
| 272 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 273 | |
| 274 if (cinfo->comp_info == NULL) /* do only once, even if suspend */ | |
| 275 cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small) | |
| 276 ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
| 277 cinfo->num_components * SIZEOF(jpeg_component_info)); | |
| 278 | |
| 279 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
| 280 ci++, compptr++) { | |
| 281 compptr->component_index = ci; | |
| 282 INPUT_BYTE(cinfo, compptr->component_id, return FALSE); | |
| 283 INPUT_BYTE(cinfo, c, return FALSE); | |
| 284 compptr->h_samp_factor = (c >> 4) & 15; | |
| 285 compptr->v_samp_factor = (c ) & 15; | |
| 286 INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE); | |
| 287 | |
| 288 TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT, | |
| 289 compptr->component_id, compptr->h_samp_factor, | |
| 290 compptr->v_samp_factor, compptr->quant_tbl_no); | |
| 291 } | |
| 292 | |
| 293 cinfo->marker->saw_SOF = TRUE; | |
| 294 | |
| 295 INPUT_SYNC(cinfo); | |
| 296 return TRUE; | |
| 297 } | |
| 298 | |
| 299 | |
| 300 LOCAL(boolean) | |
| 301 get_sos (j_decompress_ptr cinfo) | |
| 302 /* Process a SOS marker */ | |
| 303 { | |
| 304 INT32 length; | |
| 305 int i, ci, n, c, cc; | |
| 306 jpeg_component_info * compptr; | |
| 307 INPUT_VARS(cinfo); | |
| 308 | |
| 309 if (! cinfo->marker->saw_SOF) | |
| 310 ERREXIT(cinfo, JERR_SOS_NO_SOF); | |
| 311 | |
| 312 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 313 | |
| 314 INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */ | |
| 315 | |
| 316 TRACEMS1(cinfo, 1, JTRC_SOS, n); | |
| 317 | |
| 318 if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN) | |
| 319 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 320 | |
| 321 cinfo->comps_in_scan = n; | |
| 322 | |
| 323 /* Collect the component-spec parameters */ | |
| 324 | |
| 325 for (i = 0; i < n; i++) { | |
| 326 INPUT_BYTE(cinfo, cc, return FALSE); | |
| 327 INPUT_BYTE(cinfo, c, return FALSE); | |
| 328 | |
| 329 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
| 330 ci++, compptr++) { | |
| 331 if (cc == compptr->component_id) | |
| 332 goto id_found; | |
| 333 } | |
| 334 | |
| 335 ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); | |
| 336 | |
| 337 id_found: | |
| 338 | |
| 339 cinfo->cur_comp_info[i] = compptr; | |
| 340 compptr->dc_tbl_no = (c >> 4) & 15; | |
| 341 compptr->ac_tbl_no = (c ) & 15; | |
| 342 | |
| 343 TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc, | |
| 344 compptr->dc_tbl_no, compptr->ac_tbl_no); | |
| 345 | |
| 346 /* This CSi (cc) should differ from the previous CSi */ | |
| 347 for (ci = 0; ci < i; ci++) { | |
| 348 if (cinfo->cur_comp_info[ci] == compptr) | |
| 349 ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); | |
| 350 } | |
| 351 } | |
| 352 | |
| 353 /* Collect the additional scan parameters Ss, Se, Ah/Al. */ | |
| 354 INPUT_BYTE(cinfo, c, return FALSE); | |
| 355 cinfo->Ss = c; | |
| 356 INPUT_BYTE(cinfo, c, return FALSE); | |
| 357 cinfo->Se = c; | |
| 358 INPUT_BYTE(cinfo, c, return FALSE); | |
| 359 cinfo->Ah = (c >> 4) & 15; | |
| 360 cinfo->Al = (c ) & 15; | |
| 361 | |
| 362 TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se, | |
| 363 cinfo->Ah, cinfo->Al); | |
| 364 | |
| 365 /* Prepare to scan data & restart markers */ | |
| 366 cinfo->marker->next_restart_num = 0; | |
| 367 | |
| 368 /* Count another SOS marker */ | |
| 369 cinfo->input_scan_number++; | |
| 370 | |
| 371 INPUT_SYNC(cinfo); | |
| 372 return TRUE; | |
| 373 } | |
| 374 | |
| 375 | |
| 376 #ifdef D_ARITH_CODING_SUPPORTED | |
| 377 | |
| 378 LOCAL(boolean) | |
| 379 get_dac (j_decompress_ptr cinfo) | |
| 380 /* Process a DAC marker */ | |
| 381 { | |
| 382 INT32 length; | |
| 383 int index, val; | |
| 384 INPUT_VARS(cinfo); | |
| 385 | |
| 386 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 387 length -= 2; | |
| 388 | |
| 389 while (length > 0) { | |
| 390 INPUT_BYTE(cinfo, index, return FALSE); | |
| 391 INPUT_BYTE(cinfo, val, return FALSE); | |
| 392 | |
| 393 length -= 2; | |
| 394 | |
| 395 TRACEMS2(cinfo, 1, JTRC_DAC, index, val); | |
| 396 | |
| 397 if (index < 0 || index >= (2*NUM_ARITH_TBLS)) | |
| 398 ERREXIT1(cinfo, JERR_DAC_INDEX, index); | |
| 399 | |
| 400 if (index >= NUM_ARITH_TBLS) { /* define AC table */ | |
| 401 cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val; | |
| 402 } else { /* define DC table */ | |
| 403 cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F); | |
| 404 cinfo->arith_dc_U[index] = (UINT8) (val >> 4); | |
| 405 if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index]) | |
| 406 ERREXIT1(cinfo, JERR_DAC_VALUE, val); | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 if (length != 0) | |
| 411 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 412 | |
| 413 INPUT_SYNC(cinfo); | |
| 414 return TRUE; | |
| 415 } | |
| 416 | |
| 417 #else /* ! D_ARITH_CODING_SUPPORTED */ | |
| 418 | |
| 419 #define get_dac(cinfo) skip_variable(cinfo) | |
| 420 | |
| 421 #endif /* D_ARITH_CODING_SUPPORTED */ | |
| 422 | |
| 423 | |
| 424 LOCAL(boolean) | |
| 425 get_dht (j_decompress_ptr cinfo) | |
| 426 /* Process a DHT marker */ | |
| 427 { | |
| 428 INT32 length; | |
| 429 UINT8 bits[17]; | |
| 430 UINT8 huffval[256]; | |
| 431 int i, index, count; | |
| 432 JHUFF_TBL **htblptr; | |
| 433 INPUT_VARS(cinfo); | |
| 434 | |
| 435 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 436 length -= 2; | |
| 437 | |
| 438 while (length > 16) { | |
| 439 INPUT_BYTE(cinfo, index, return FALSE); | |
| 440 | |
| 441 TRACEMS1(cinfo, 1, JTRC_DHT, index); | |
| 442 | |
| 443 bits[0] = 0; | |
| 444 count = 0; | |
| 445 for (i = 1; i <= 16; i++) { | |
| 446 INPUT_BYTE(cinfo, bits[i], return FALSE); | |
| 447 count += bits[i]; | |
| 448 } | |
| 449 | |
| 450 length -= 1 + 16; | |
| 451 | |
| 452 TRACEMS8(cinfo, 2, JTRC_HUFFBITS, | |
| 453 bits[1], bits[2], bits[3], bits[4], | |
| 454 bits[5], bits[6], bits[7], bits[8]); | |
| 455 TRACEMS8(cinfo, 2, JTRC_HUFFBITS, | |
| 456 bits[9], bits[10], bits[11], bits[12], | |
| 457 bits[13], bits[14], bits[15], bits[16]); | |
| 458 | |
| 459 /* Here we just do minimal validation of the counts to avoid walking | |
| 460 * off the end of our table space. jdhuff.c will check more carefully. | |
| 461 */ | |
| 462 if (count > 256 || ((INT32) count) > length) | |
| 463 ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); | |
| 464 | |
| 465 for (i = 0; i < count; i++) | |
| 466 INPUT_BYTE(cinfo, huffval[i], return FALSE); | |
| 467 | |
| 468 length -= count; | |
| 469 | |
| 470 if (index & 0x10) { /* AC table definition */ | |
| 471 index -= 0x10; | |
| 472 htblptr = &cinfo->ac_huff_tbl_ptrs[index]; | |
| 473 } else { /* DC table definition */ | |
| 474 htblptr = &cinfo->dc_huff_tbl_ptrs[index]; | |
| 475 } | |
| 476 | |
| 477 if (index < 0 || index >= NUM_HUFF_TBLS) | |
| 478 ERREXIT1(cinfo, JERR_DHT_INDEX, index); | |
| 479 | |
| 480 if (*htblptr == NULL) | |
| 481 *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); | |
| 482 | |
| 483 MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); | |
| 484 MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval)); | |
| 485 } | |
| 486 | |
| 487 if (length != 0) | |
| 488 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 489 | |
| 490 INPUT_SYNC(cinfo); | |
| 491 return TRUE; | |
| 492 } | |
| 493 | |
| 494 | |
| 495 LOCAL(boolean) | |
| 496 get_dqt (j_decompress_ptr cinfo) | |
| 497 /* Process a DQT marker */ | |
| 498 { | |
| 499 INT32 length; | |
| 500 int n, i, prec; | |
| 501 unsigned int tmp; | |
| 502 JQUANT_TBL *quant_ptr; | |
| 503 INPUT_VARS(cinfo); | |
| 504 | |
| 505 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 506 length -= 2; | |
| 507 | |
| 508 while (length > 0) { | |
| 509 INPUT_BYTE(cinfo, n, return FALSE); | |
| 510 prec = n >> 4; | |
| 511 n &= 0x0F; | |
| 512 | |
| 513 TRACEMS2(cinfo, 1, JTRC_DQT, n, prec); | |
| 514 | |
| 515 if (n >= NUM_QUANT_TBLS) | |
| 516 ERREXIT1(cinfo, JERR_DQT_INDEX, n); | |
| 517 | |
| 518 if (cinfo->quant_tbl_ptrs[n] == NULL) | |
| 519 cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo); | |
| 520 quant_ptr = cinfo->quant_tbl_ptrs[n]; | |
| 521 | |
| 522 for (i = 0; i < DCTSIZE2; i++) { | |
| 523 if (prec) | |
| 524 INPUT_2BYTES(cinfo, tmp, return FALSE); | |
| 525 else | |
| 526 INPUT_BYTE(cinfo, tmp, return FALSE); | |
| 527 /* We convert the zigzag-order table to natural array order. */ | |
| 528 quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp; | |
| 529 } | |
| 530 | |
| 531 if (cinfo->err->trace_level >= 2) { | |
| 532 for (i = 0; i < DCTSIZE2; i += 8) { | |
| 533 TRACEMS8(cinfo, 2, JTRC_QUANTVALS, | |
| 534 quant_ptr->quantval[i], quant_ptr->quantval[i+1], | |
| 535 quant_ptr->quantval[i+2], quant_ptr->quantval[i+3], | |
| 536 quant_ptr->quantval[i+4], quant_ptr->quantval[i+5], | |
| 537 quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]); | |
| 538 } | |
| 539 } | |
| 540 | |
| 541 length -= DCTSIZE2+1; | |
| 542 if (prec) length -= DCTSIZE2; | |
| 543 } | |
| 544 | |
| 545 if (length != 0) | |
| 546 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 547 | |
| 548 INPUT_SYNC(cinfo); | |
| 549 return TRUE; | |
| 550 } | |
| 551 | |
| 552 | |
| 553 LOCAL(boolean) | |
| 554 get_dri (j_decompress_ptr cinfo) | |
| 555 /* Process a DRI marker */ | |
| 556 { | |
| 557 INT32 length; | |
| 558 unsigned int tmp; | |
| 559 INPUT_VARS(cinfo); | |
| 560 | |
| 561 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 562 | |
| 563 if (length != 4) | |
| 564 ERREXIT(cinfo, JERR_BAD_LENGTH); | |
| 565 | |
| 566 INPUT_2BYTES(cinfo, tmp, return FALSE); | |
| 567 | |
| 568 TRACEMS1(cinfo, 1, JTRC_DRI, tmp); | |
| 569 | |
| 570 cinfo->restart_interval = tmp; | |
| 571 | |
| 572 INPUT_SYNC(cinfo); | |
| 573 return TRUE; | |
| 574 } | |
| 575 | |
| 576 | |
| 577 /* | |
| 578 * Routines for processing APPn and COM markers. | |
| 579 * These are either saved in memory or discarded, per application request. | |
| 580 * APP0 and APP14 are specially checked to see if they are | |
| 581 * JFIF and Adobe markers, respectively. | |
| 582 */ | |
| 583 | |
| 584 #define APP0_DATA_LEN 14 /* Length of interesting data in APP0 */ | |
| 585 #define APP14_DATA_LEN 12 /* Length of interesting data in APP14 */ | |
| 586 #define APPN_DATA_LEN 14 /* Must be the largest of the above!! */ | |
| 587 | |
| 588 | |
| 589 LOCAL(void) | |
| 590 examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data, | |
| 591 unsigned int datalen, INT32 remaining) | |
| 592 /* Examine first few bytes from an APP0. | |
| 593 * Take appropriate action if it is a JFIF marker. | |
| 594 * datalen is # of bytes at data[], remaining is length of rest of marker data. | |
| 595 */ | |
| 596 { | |
| 597 INT32 totallen = (INT32) datalen + remaining; | |
| 598 | |
| 599 if (datalen >= APP0_DATA_LEN && | |
| 600 GETJOCTET(data[0]) == 0x4A && | |
| 601 GETJOCTET(data[1]) == 0x46 && | |
| 602 GETJOCTET(data[2]) == 0x49 && | |
| 603 GETJOCTET(data[3]) == 0x46 && | |
| 604 GETJOCTET(data[4]) == 0) { | |
| 605 /* Found JFIF APP0 marker: save info */ | |
| 606 cinfo->saw_JFIF_marker = TRUE; | |
| 607 cinfo->JFIF_major_version = GETJOCTET(data[5]); | |
| 608 cinfo->JFIF_minor_version = GETJOCTET(data[6]); | |
| 609 cinfo->density_unit = GETJOCTET(data[7]); | |
| 610 cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]); | |
| 611 cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]); | |
| 612 /* Check version. | |
| 613 * Major version must be 1, anything else signals an incompatible change. | |
| 614 * (We used to treat this as an error, but now it's a nonfatal warning, | |
| 615 * because some bozo at Hijaak couldn't read the spec.) | |
| 616 * Minor version should be 0..2, but process anyway if newer. | |
| 617 */ | |
| 618 if (cinfo->JFIF_major_version != 1) | |
| 619 WARNMS2(cinfo, JWRN_JFIF_MAJOR, | |
| 620 cinfo->JFIF_major_version, cinfo->JFIF_minor_version); | |
| 621 /* Generate trace messages */ | |
| 622 TRACEMS5(cinfo, 1, JTRC_JFIF, | |
| 623 cinfo->JFIF_major_version, cinfo->JFIF_minor_version, | |
| 624 cinfo->X_density, cinfo->Y_density, cinfo->density_unit); | |
| 625 /* Validate thumbnail dimensions and issue appropriate messages */ | |
| 626 if (GETJOCTET(data[12]) | GETJOCTET(data[13])) | |
| 627 TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL, | |
| 628 GETJOCTET(data[12]), GETJOCTET(data[13])); | |
| 629 totallen -= APP0_DATA_LEN; | |
| 630 if (totallen != | |
| 631 ((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3)) | |
| 632 TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen); | |
| 633 } else if (datalen >= 6 && | |
| 634 GETJOCTET(data[0]) == 0x4A && | |
| 635 GETJOCTET(data[1]) == 0x46 && | |
| 636 GETJOCTET(data[2]) == 0x58 && | |
| 637 GETJOCTET(data[3]) == 0x58 && | |
| 638 GETJOCTET(data[4]) == 0) { | |
| 639 /* Found JFIF "JFXX" extension APP0 marker */ | |
| 640 /* The library doesn't actually do anything with these, | |
| 641 * but we try to produce a helpful trace message. | |
| 642 */ | |
| 643 switch (GETJOCTET(data[5])) { | |
| 644 case 0x10: | |
| 645 TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen); | |
| 646 break; | |
| 647 case 0x11: | |
| 648 TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen); | |
| 649 break; | |
| 650 case 0x13: | |
| 651 TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen); | |
| 652 break; | |
| 653 default: | |
| 654 TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION, | |
| 655 GETJOCTET(data[5]), (int) totallen); | |
| 656 break; | |
| 657 } | |
| 658 } else { | |
| 659 /* Start of APP0 does not match "JFIF" or "JFXX", or too short */ | |
| 660 TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen); | |
| 661 } | |
| 662 } | |
| 663 | |
| 664 | |
| 665 LOCAL(void) | |
| 666 examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data, | |
| 667 unsigned int datalen, INT32 remaining) | |
| 668 /* Examine first few bytes from an APP14. | |
| 669 * Take appropriate action if it is an Adobe marker. | |
| 670 * datalen is # of bytes at data[], remaining is length of rest of marker data. | |
| 671 */ | |
| 672 { | |
| 673 unsigned int version, flags0, flags1, transform; | |
| 674 | |
| 675 if (datalen >= APP14_DATA_LEN && | |
| 676 GETJOCTET(data[0]) == 0x41 && | |
| 677 GETJOCTET(data[1]) == 0x64 && | |
| 678 GETJOCTET(data[2]) == 0x6F && | |
| 679 GETJOCTET(data[3]) == 0x62 && | |
| 680 GETJOCTET(data[4]) == 0x65) { | |
| 681 /* Found Adobe APP14 marker */ | |
| 682 version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]); | |
| 683 flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]); | |
| 684 flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]); | |
| 685 transform = GETJOCTET(data[11]); | |
| 686 TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform); | |
| 687 cinfo->saw_Adobe_marker = TRUE; | |
| 688 cinfo->Adobe_transform = (UINT8) transform; | |
| 689 } else { | |
| 690 /* Start of APP14 does not match "Adobe", or too short */ | |
| 691 TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining)); | |
| 692 } | |
| 693 } | |
| 694 | |
| 695 | |
| 696 METHODDEF(boolean) | |
| 697 get_interesting_appn (j_decompress_ptr cinfo) | |
| 698 /* Process an APP0 or APP14 marker without saving it */ | |
| 699 { | |
| 700 INT32 length; | |
| 701 JOCTET b[APPN_DATA_LEN]; | |
| 702 unsigned int i, numtoread; | |
| 703 INPUT_VARS(cinfo); | |
| 704 | |
| 705 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 706 length -= 2; | |
| 707 | |
| 708 /* get the interesting part of the marker data */ | |
| 709 if (length >= APPN_DATA_LEN) | |
| 710 numtoread = APPN_DATA_LEN; | |
| 711 else if (length > 0) | |
| 712 numtoread = (unsigned int) length; | |
| 713 else | |
| 714 numtoread = 0; | |
| 715 for (i = 0; i < numtoread; i++) | |
| 716 INPUT_BYTE(cinfo, b[i], return FALSE); | |
| 717 length -= numtoread; | |
| 718 | |
| 719 /* process it */ | |
| 720 switch (cinfo->unread_marker) { | |
| 721 case M_APP0: | |
| 722 examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length); | |
| 723 break; | |
| 724 case M_APP14: | |
| 725 examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length); | |
| 726 break; | |
| 727 default: | |
| 728 /* can't get here unless jpeg_save_markers chooses wrong processor */ | |
| 729 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); | |
| 730 break; | |
| 731 } | |
| 732 | |
| 733 /* skip any remaining data -- could be lots */ | |
| 734 INPUT_SYNC(cinfo); | |
| 735 if (length > 0) | |
| 736 (*cinfo->src->skip_input_data) (cinfo, (long) length); | |
| 737 | |
| 738 return TRUE; | |
| 739 } | |
| 740 | |
| 741 | |
| 742 #ifdef SAVE_MARKERS_SUPPORTED | |
| 743 | |
| 744 METHODDEF(boolean) | |
| 745 save_marker (j_decompress_ptr cinfo) | |
| 746 /* Save an APPn or COM marker into the marker list */ | |
| 747 { | |
| 748 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
| 749 jpeg_saved_marker_ptr cur_marker = marker->cur_marker; | |
| 750 unsigned int bytes_read, data_length; | |
| 751 JOCTET FAR * data; | |
| 752 INT32 length = 0; | |
| 753 INPUT_VARS(cinfo); | |
| 754 | |
| 755 if (cur_marker == NULL) { | |
| 756 /* begin reading a marker */ | |
| 757 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 758 length -= 2; | |
| 759 if (length >= 0) { /* watch out for bogus length word */ | |
| 760 /* figure out how much we want to save */ | |
| 761 unsigned int limit; | |
| 762 if (cinfo->unread_marker == (int) M_COM) | |
| 763 limit = marker->length_limit_COM; | |
| 764 else | |
| 765 limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0]; | |
| 766 if ((unsigned int) length < limit) | |
| 767 limit = (unsigned int) length; | |
| 768 /* allocate and initialize the marker item */ | |
| 769 cur_marker = (jpeg_saved_marker_ptr) | |
| 770 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
| 771 SIZEOF(struct jpeg_marker_struct) + limit); | |
| 772 cur_marker->next = NULL; | |
| 773 cur_marker->marker = (UINT8) cinfo->unread_marker; | |
| 774 cur_marker->original_length = (unsigned int) length; | |
| 775 cur_marker->data_length = limit; | |
| 776 /* data area is just beyond the jpeg_marker_struct */ | |
| 777 data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1); | |
| 778 marker->cur_marker = cur_marker; | |
| 779 marker->bytes_read = 0; | |
| 780 bytes_read = 0; | |
| 781 data_length = limit; | |
| 782 } else { | |
| 783 /* deal with bogus length word */ | |
| 784 bytes_read = data_length = 0; | |
| 785 data = NULL; | |
| 786 } | |
| 787 } else { | |
| 788 /* resume reading a marker */ | |
| 789 bytes_read = marker->bytes_read; | |
| 790 data_length = cur_marker->data_length; | |
| 791 data = cur_marker->data + bytes_read; | |
| 792 } | |
| 793 | |
| 794 while (bytes_read < data_length) { | |
| 795 INPUT_SYNC(cinfo); /* move the restart point to here */ | |
| 796 marker->bytes_read = bytes_read; | |
| 797 /* If there's not at least one byte in buffer, suspend */ | |
| 798 MAKE_BYTE_AVAIL(cinfo, return FALSE); | |
| 799 /* Copy bytes with reasonable rapidity */ | |
| 800 while (bytes_read < data_length && bytes_in_buffer > 0) { | |
| 801 *data++ = *next_input_byte++; | |
| 802 bytes_in_buffer--; | |
| 803 bytes_read++; | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 /* Done reading what we want to read */ | |
| 808 if (cur_marker != NULL) { /* will be NULL if bogus length word */ | |
| 809 /* Add new marker to end of list */ | |
| 810 if (cinfo->marker_list == NULL) { | |
| 811 cinfo->marker_list = cur_marker; | |
| 812 } else { | |
| 813 jpeg_saved_marker_ptr prev = cinfo->marker_list; | |
| 814 while (prev->next != NULL) | |
| 815 prev = prev->next; | |
| 816 prev->next = cur_marker; | |
| 817 } | |
| 818 /* Reset pointer & calc remaining data length */ | |
| 819 data = cur_marker->data; | |
| 820 length = cur_marker->original_length - data_length; | |
| 821 } | |
| 822 /* Reset to initial state for next marker */ | |
| 823 marker->cur_marker = NULL; | |
| 824 | |
| 825 /* Process the marker if interesting; else just make a generic trace msg */ | |
| 826 switch (cinfo->unread_marker) { | |
| 827 case M_APP0: | |
| 828 examine_app0(cinfo, data, data_length, length); | |
| 829 break; | |
| 830 case M_APP14: | |
| 831 examine_app14(cinfo, data, data_length, length); | |
| 832 break; | |
| 833 default: | |
| 834 TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, | |
| 835 (int) (data_length + length)); | |
| 836 break; | |
| 837 } | |
| 838 | |
| 839 /* skip any remaining data -- could be lots */ | |
| 840 INPUT_SYNC(cinfo); /* do before skip_input_data */ | |
| 841 if (length > 0) | |
| 842 (*cinfo->src->skip_input_data) (cinfo, (long) length); | |
| 843 | |
| 844 return TRUE; | |
| 845 } | |
| 846 | |
| 847 #endif /* SAVE_MARKERS_SUPPORTED */ | |
| 848 | |
| 849 | |
| 850 METHODDEF(boolean) | |
| 851 skip_variable (j_decompress_ptr cinfo) | |
| 852 /* Skip over an unknown or uninteresting variable-length marker */ | |
| 853 { | |
| 854 INT32 length; | |
| 855 INPUT_VARS(cinfo); | |
| 856 | |
| 857 INPUT_2BYTES(cinfo, length, return FALSE); | |
| 858 length -= 2; | |
| 859 | |
| 860 TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length); | |
| 861 | |
| 862 INPUT_SYNC(cinfo); /* do before skip_input_data */ | |
| 863 if (length > 0) | |
| 864 (*cinfo->src->skip_input_data) (cinfo, (long) length); | |
| 865 | |
| 866 return TRUE; | |
| 867 } | |
| 868 | |
| 869 | |
| 870 /* | |
| 871 * Find the next JPEG marker, save it in cinfo->unread_marker. | |
| 872 * Returns FALSE if had to suspend before reaching a marker; | |
| 873 * in that case cinfo->unread_marker is unchanged. | |
| 874 * | |
| 875 * Note that the result might not be a valid marker code, | |
| 876 * but it will never be 0 or FF. | |
| 877 */ | |
| 878 | |
| 879 LOCAL(boolean) | |
| 880 next_marker (j_decompress_ptr cinfo) | |
| 881 { | |
| 882 int c; | |
| 883 INPUT_VARS(cinfo); | |
| 884 | |
| 885 for (;;) { | |
| 886 INPUT_BYTE(cinfo, c, return FALSE); | |
| 887 /* Skip any non-FF bytes. | |
| 888 * This may look a bit inefficient, but it will not occur in a valid file. | |
| 889 * We sync after each discarded byte so that a suspending data source | |
| 890 * can discard the byte from its buffer. | |
| 891 */ | |
| 892 while (c != 0xFF) { | |
| 893 cinfo->marker->discarded_bytes++; | |
| 894 INPUT_SYNC(cinfo); | |
| 895 INPUT_BYTE(cinfo, c, return FALSE); | |
| 896 } | |
| 897 /* This loop swallows any duplicate FF bytes. Extra FFs are legal as | |
| 898 * pad bytes, so don't count them in discarded_bytes. We assume there | |
| 899 * will not be so many consecutive FF bytes as to overflow a suspending | |
| 900 * data source's input buffer. | |
| 901 */ | |
| 902 do { | |
| 903 INPUT_BYTE(cinfo, c, return FALSE); | |
| 904 } while (c == 0xFF); | |
| 905 if (c != 0) | |
| 906 break; /* found a valid marker, exit loop */ | |
| 907 /* Reach here if we found a stuffed-zero data sequence (FF/00). | |
| 908 * Discard it and loop back to try again. | |
| 909 */ | |
| 910 cinfo->marker->discarded_bytes += 2; | |
| 911 INPUT_SYNC(cinfo); | |
| 912 } | |
| 913 | |
| 914 if (cinfo->marker->discarded_bytes != 0) { | |
| 915 WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c); | |
| 916 cinfo->marker->discarded_bytes = 0; | |
| 917 } | |
| 918 | |
| 919 cinfo->unread_marker = c; | |
| 920 | |
| 921 INPUT_SYNC(cinfo); | |
| 922 return TRUE; | |
| 923 } | |
| 924 | |
| 925 | |
| 926 LOCAL(boolean) | |
| 927 first_marker (j_decompress_ptr cinfo) | |
| 928 /* Like next_marker, but used to obtain the initial SOI marker. */ | |
| 929 /* For this marker, we do not allow preceding garbage or fill; otherwise, | |
| 930 * we might well scan an entire input file before realizing it ain't JPEG. | |
| 931 * If an application wants to process non-JFIF files, it must seek to the | |
| 932 * SOI before calling the JPEG library. | |
| 933 */ | |
| 934 { | |
| 935 int c, c2; | |
| 936 INPUT_VARS(cinfo); | |
| 937 | |
| 938 INPUT_BYTE(cinfo, c, return FALSE); | |
| 939 INPUT_BYTE(cinfo, c2, return FALSE); | |
| 940 if (c != 0xFF || c2 != (int) M_SOI) | |
| 941 ERREXIT2(cinfo, JERR_NO_SOI, c, c2); | |
| 942 | |
| 943 cinfo->unread_marker = c2; | |
| 944 | |
| 945 INPUT_SYNC(cinfo); | |
| 946 return TRUE; | |
| 947 } | |
| 948 | |
| 949 | |
| 950 /* | |
| 951 * Read markers until SOS or EOI. | |
| 952 * | |
| 953 * Returns same codes as are defined for jpeg_consume_input: | |
| 954 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. | |
| 955 */ | |
| 956 | |
| 957 METHODDEF(int) | |
| 958 read_markers (j_decompress_ptr cinfo) | |
| 959 { | |
| 960 /* Outer loop repeats once for each marker. */ | |
| 961 for (;;) { | |
| 962 /* Collect the marker proper, unless we already did. */ | |
| 963 /* NB: first_marker() enforces the requirement that SOI appear first. */ | |
| 964 if (cinfo->unread_marker == 0) { | |
| 965 if (! cinfo->marker->saw_SOI) { | |
| 966 if (! first_marker(cinfo)) | |
| 967 return JPEG_SUSPENDED; | |
| 968 } else { | |
| 969 if (! next_marker(cinfo)) | |
| 970 return JPEG_SUSPENDED; | |
| 971 } | |
| 972 } | |
| 973 /* At this point cinfo->unread_marker contains the marker code and the | |
| 974 * input point is just past the marker proper, but before any parameters. | |
| 975 * A suspension will cause us to return with this state still true. | |
| 976 */ | |
| 977 switch (cinfo->unread_marker) { | |
| 978 case M_SOI: | |
| 979 if (! get_soi(cinfo)) | |
| 980 return JPEG_SUSPENDED; | |
| 981 break; | |
| 982 | |
| 983 case M_SOF0: /* Baseline */ | |
| 984 case M_SOF1: /* Extended sequential, Huffman */ | |
| 985 if (! get_sof(cinfo, FALSE, FALSE)) | |
| 986 return JPEG_SUSPENDED; | |
| 987 break; | |
| 988 | |
| 989 case M_SOF2: /* Progressive, Huffman */ | |
| 990 if (! get_sof(cinfo, TRUE, FALSE)) | |
| 991 return JPEG_SUSPENDED; | |
| 992 break; | |
| 993 | |
| 994 case M_SOF9: /* Extended sequential, arithmetic */ | |
| 995 if (! get_sof(cinfo, FALSE, TRUE)) | |
| 996 return JPEG_SUSPENDED; | |
| 997 break; | |
| 998 | |
| 999 case M_SOF10: /* Progressive, arithmetic */ | |
| 1000 if (! get_sof(cinfo, TRUE, TRUE)) | |
| 1001 return JPEG_SUSPENDED; | |
| 1002 break; | |
| 1003 | |
| 1004 /* Currently unsupported SOFn types */ | |
| 1005 case M_SOF3: /* Lossless, Huffman */ | |
| 1006 case M_SOF5: /* Differential sequential, Huffman */ | |
| 1007 case M_SOF6: /* Differential progressive, Huffman */ | |
| 1008 case M_SOF7: /* Differential lossless, Huffman */ | |
| 1009 case M_JPG: /* Reserved for JPEG extensions */ | |
| 1010 case M_SOF11: /* Lossless, arithmetic */ | |
| 1011 case M_SOF13: /* Differential sequential, arithmetic */ | |
| 1012 case M_SOF14: /* Differential progressive, arithmetic */ | |
| 1013 case M_SOF15: /* Differential lossless, arithmetic */ | |
| 1014 ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker); | |
| 1015 break; | |
| 1016 | |
| 1017 case M_SOS: | |
| 1018 if (! get_sos(cinfo)) | |
| 1019 return JPEG_SUSPENDED; | |
| 1020 cinfo->unread_marker = 0; /* processed the marker */ | |
| 1021 return JPEG_REACHED_SOS; | |
| 1022 | |
| 1023 case M_EOI: | |
| 1024 TRACEMS(cinfo, 1, JTRC_EOI); | |
| 1025 cinfo->unread_marker = 0; /* processed the marker */ | |
| 1026 return JPEG_REACHED_EOI; | |
| 1027 | |
| 1028 case M_DAC: | |
| 1029 if (! get_dac(cinfo)) | |
| 1030 return JPEG_SUSPENDED; | |
| 1031 break; | |
| 1032 | |
| 1033 case M_DHT: | |
| 1034 if (! get_dht(cinfo)) | |
| 1035 return JPEG_SUSPENDED; | |
| 1036 break; | |
| 1037 | |
| 1038 case M_DQT: | |
| 1039 if (! get_dqt(cinfo)) | |
| 1040 return JPEG_SUSPENDED; | |
| 1041 break; | |
| 1042 | |
| 1043 case M_DRI: | |
| 1044 if (! get_dri(cinfo)) | |
| 1045 return JPEG_SUSPENDED; | |
| 1046 break; | |
| 1047 | |
| 1048 case M_APP0: | |
| 1049 case M_APP1: | |
| 1050 case M_APP2: | |
| 1051 case M_APP3: | |
| 1052 case M_APP4: | |
| 1053 case M_APP5: | |
| 1054 case M_APP6: | |
| 1055 case M_APP7: | |
| 1056 case M_APP8: | |
| 1057 case M_APP9: | |
| 1058 case M_APP10: | |
| 1059 case M_APP11: | |
| 1060 case M_APP12: | |
| 1061 case M_APP13: | |
| 1062 case M_APP14: | |
| 1063 case M_APP15: | |
| 1064 if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[ | |
| 1065 cinfo->unread_marker - (int) M_APP0]) (cinfo)) | |
| 1066 return JPEG_SUSPENDED; | |
| 1067 break; | |
| 1068 | |
| 1069 case M_COM: | |
| 1070 if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo)) | |
| 1071 return JPEG_SUSPENDED; | |
| 1072 break; | |
| 1073 | |
| 1074 case M_RST0: /* these are all parameterless */ | |
| 1075 case M_RST1: | |
| 1076 case M_RST2: | |
| 1077 case M_RST3: | |
| 1078 case M_RST4: | |
| 1079 case M_RST5: | |
| 1080 case M_RST6: | |
| 1081 case M_RST7: | |
| 1082 case M_TEM: | |
| 1083 TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker); | |
| 1084 break; | |
| 1085 | |
| 1086 case M_DNL: /* Ignore DNL ... perhaps the wrong thing */ | |
| 1087 if (! skip_variable(cinfo)) | |
| 1088 return JPEG_SUSPENDED; | |
| 1089 break; | |
| 1090 | |
| 1091 default: /* must be DHP, EXP, JPGn, or RESn */ | |
| 1092 /* For now, we treat the reserved markers as fatal errors since they are | |
| 1093 * likely to be used to signal incompatible JPEG Part 3 extensions. | |
| 1094 * Once the JPEG 3 version-number marker is well defined, this code | |
| 1095 * ought to change! | |
| 1096 */ | |
| 1097 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); | |
| 1098 break; | |
| 1099 } | |
| 1100 /* Successfully processed marker, so reset state variable */ | |
| 1101 cinfo->unread_marker = 0; | |
| 1102 } /* end loop */ | |
| 1103 } | |
| 1104 | |
| 1105 | |
| 1106 /* | |
| 1107 * Read a restart marker, which is expected to appear next in the datastream; | |
| 1108 * if the marker is not there, take appropriate recovery action. | |
| 1109 * Returns FALSE if suspension is required. | |
| 1110 * | |
| 1111 * This is called by the entropy decoder after it has read an appropriate | |
| 1112 * number of MCUs. cinfo->unread_marker may be nonzero if the entropy decoder | |
| 1113 * has already read a marker from the data source. Under normal conditions | |
| 1114 * cinfo->unread_marker will be reset to 0 before returning; if not reset, | |
| 1115 * it holds a marker which the decoder will be unable to read past. | |
| 1116 */ | |
| 1117 | |
| 1118 METHODDEF(boolean) | |
| 1119 read_restart_marker (j_decompress_ptr cinfo) | |
| 1120 { | |
| 1121 /* Obtain a marker unless we already did. */ | |
| 1122 /* Note that next_marker will complain if it skips any data. */ | |
| 1123 if (cinfo->unread_marker == 0) { | |
| 1124 if (! next_marker(cinfo)) | |
| 1125 return FALSE; | |
| 1126 } | |
| 1127 | |
| 1128 if (cinfo->unread_marker == | |
| 1129 ((int) M_RST0 + cinfo->marker->next_restart_num)) { | |
| 1130 /* Normal case --- swallow the marker and let entropy decoder continue */ | |
| 1131 TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num); | |
| 1132 cinfo->unread_marker = 0; | |
| 1133 } else { | |
| 1134 /* Uh-oh, the restart markers have been messed up. */ | |
| 1135 /* Let the data source manager determine how to resync. */ | |
| 1136 if (! (*cinfo->src->resync_to_restart) (cinfo, | |
| 1137 cinfo->marker->next_restart_num)) | |
| 1138 return FALSE; | |
| 1139 } | |
| 1140 | |
| 1141 /* Update next-restart state */ | |
| 1142 cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7; | |
| 1143 | |
| 1144 return TRUE; | |
| 1145 } | |
| 1146 | |
| 1147 | |
| 1148 /* | |
| 1149 * This is the default resync_to_restart method for data source managers | |
| 1150 * to use if they don't have any better approach. Some data source managers | |
| 1151 * may be able to back up, or may have additional knowledge about the data | |
| 1152 * which permits a more intelligent recovery strategy; such managers would | |
| 1153 * presumably supply their own resync method. | |
| 1154 * | |
| 1155 * read_restart_marker calls resync_to_restart if it finds a marker other than | |
| 1156 * the restart marker it was expecting. (This code is *not* used unless | |
| 1157 * a nonzero restart interval has been declared.) cinfo->unread_marker is | |
| 1158 * the marker code actually found (might be anything, except 0 or FF). | |
| 1159 * The desired restart marker number (0..7) is passed as a parameter. | |
| 1160 * This routine is supposed to apply whatever error recovery strategy seems | |
| 1161 * appropriate in order to position the input stream to the next data segment. | |
| 1162 * Note that cinfo->unread_marker is treated as a marker appearing before | |
| 1163 * the current data-source input point; usually it should be reset to zero | |
| 1164 * before returning. | |
| 1165 * Returns FALSE if suspension is required. | |
| 1166 * | |
| 1167 * This implementation is substantially constrained by wanting to treat the | |
| 1168 * input as a data stream; this means we can't back up. Therefore, we have | |
| 1169 * only the following actions to work with: | |
| 1170 * 1. Simply discard the marker and let the entropy decoder resume at next | |
| 1171 * byte of file. | |
| 1172 * 2. Read forward until we find another marker, discarding intervening | |
| 1173 * data. (In theory we could look ahead within the current bufferload, | |
| 1174 * without having to discard data if we don't find the desired marker. | |
| 1175 * This idea is not implemented here, in part because it makes behavior | |
| 1176 * dependent on buffer size and chance buffer-boundary positions.) | |
| 1177 * 3. Leave the marker unread (by failing to zero cinfo->unread_marker). | |
| 1178 * This will cause the entropy decoder to process an empty data segment, | |
| 1179 * inserting dummy zeroes, and then we will reprocess the marker. | |
| 1180 * | |
| 1181 * #2 is appropriate if we think the desired marker lies ahead, while #3 is | |
| 1182 * appropriate if the found marker is a future restart marker (indicating | |
| 1183 * that we have missed the desired restart marker, probably because it got | |
| 1184 * corrupted). | |
| 1185 * We apply #2 or #3 if the found marker is a restart marker no more than | |
| 1186 * two counts behind or ahead of the expected one. We also apply #2 if the | |
| 1187 * found marker is not a legal JPEG marker code (it's certainly bogus data). | |
| 1188 * If the found marker is a restart marker more than 2 counts away, we do #1 | |
| 1189 * (too much risk that the marker is erroneous; with luck we will be able to | |
| 1190 * resync at some future point). | |
| 1191 * For any valid non-restart JPEG marker, we apply #3. This keeps us from | |
| 1192 * overrunning the end of a scan. An implementation limited to single-scan | |
| 1193 * files might find it better to apply #2 for markers other than EOI, since | |
| 1194 * any other marker would have to be bogus data in that case. | |
| 1195 */ | |
| 1196 | |
| 1197 GLOBAL(boolean) | |
| 1198 jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired) | |
| 1199 { | |
| 1200 int marker = cinfo->unread_marker; | |
| 1201 int action = 1; | |
| 1202 | |
| 1203 /* Always put up a warning. */ | |
| 1204 WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired); | |
| 1205 | |
| 1206 /* Outer loop handles repeated decision after scanning forward. */ | |
| 1207 for (;;) { | |
| 1208 if (marker < (int) M_SOF0) | |
| 1209 action = 2; /* invalid marker */ | |
| 1210 else if (marker < (int) M_RST0 || marker > (int) M_RST7) | |
| 1211 action = 3; /* valid non-restart marker */ | |
| 1212 else { | |
| 1213 if (marker == ((int) M_RST0 + ((desired+1) & 7)) || | |
| 1214 marker == ((int) M_RST0 + ((desired+2) & 7))) | |
| 1215 action = 3; /* one of the next two expected restarts */ | |
| 1216 else if (marker == ((int) M_RST0 + ((desired-1) & 7)) || | |
| 1217 marker == ((int) M_RST0 + ((desired-2) & 7))) | |
| 1218 action = 2; /* a prior restart, so advance */ | |
| 1219 else | |
| 1220 action = 1; /* desired restart or too far away */ | |
| 1221 } | |
| 1222 TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action); | |
| 1223 switch (action) { | |
| 1224 case 1: | |
| 1225 /* Discard marker and let entropy decoder resume processing. */ | |
| 1226 cinfo->unread_marker = 0; | |
| 1227 return TRUE; | |
| 1228 case 2: | |
| 1229 /* Scan to the next marker, and repeat the decision loop. */ | |
| 1230 if (! next_marker(cinfo)) | |
| 1231 return FALSE; | |
| 1232 marker = cinfo->unread_marker; | |
| 1233 break; | |
| 1234 case 3: | |
| 1235 /* Return without advancing past this marker. */ | |
| 1236 /* Entropy decoder will be forced to process an empty segment. */ | |
| 1237 return TRUE; | |
| 1238 } | |
| 1239 } /* end loop */ | |
| 1240 } | |
| 1241 | |
| 1242 | |
| 1243 /* | |
| 1244 * Reset marker processing state to begin a fresh datastream. | |
| 1245 */ | |
| 1246 | |
| 1247 METHODDEF(void) | |
| 1248 reset_marker_reader (j_decompress_ptr cinfo) | |
| 1249 { | |
| 1250 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
| 1251 | |
| 1252 cinfo->comp_info = NULL; /* until allocated by get_sof */ | |
| 1253 cinfo->input_scan_number = 0; /* no SOS seen yet */ | |
| 1254 cinfo->unread_marker = 0; /* no pending marker */ | |
| 1255 marker->pub.saw_SOI = FALSE; /* set internal state too */ | |
| 1256 marker->pub.saw_SOF = FALSE; | |
| 1257 marker->pub.discarded_bytes = 0; | |
| 1258 marker->cur_marker = NULL; | |
| 1259 } | |
| 1260 | |
| 1261 | |
| 1262 /* | |
| 1263 * Initialize the marker reader module. | |
| 1264 * This is called only once, when the decompression object is created. | |
| 1265 */ | |
| 1266 | |
| 1267 GLOBAL(void) | |
| 1268 jinit_marker_reader (j_decompress_ptr cinfo) | |
| 1269 { | |
| 1270 my_marker_ptr marker; | |
| 1271 int i; | |
| 1272 | |
| 1273 /* Create subobject in permanent pool */ | |
| 1274 marker = (my_marker_ptr) | |
| 1275 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | |
| 1276 SIZEOF(my_marker_reader)); | |
| 1277 cinfo->marker = (struct jpeg_marker_reader *) marker; | |
| 1278 /* Initialize public method pointers */ | |
| 1279 marker->pub.reset_marker_reader = reset_marker_reader; | |
| 1280 marker->pub.read_markers = read_markers; | |
| 1281 marker->pub.read_restart_marker = read_restart_marker; | |
| 1282 /* Initialize COM/APPn processing. | |
| 1283 * By default, we examine and then discard APP0 and APP14, | |
| 1284 * but simply discard COM and all other APPn. | |
| 1285 */ | |
| 1286 marker->process_COM = skip_variable; | |
| 1287 marker->length_limit_COM = 0; | |
| 1288 for (i = 0; i < 16; i++) { | |
| 1289 marker->process_APPn[i] = skip_variable; | |
| 1290 marker->length_limit_APPn[i] = 0; | |
| 1291 } | |
| 1292 marker->process_APPn[0] = get_interesting_appn; | |
| 1293 marker->process_APPn[14] = get_interesting_appn; | |
| 1294 /* Reset marker processing state */ | |
| 1295 reset_marker_reader(cinfo); | |
| 1296 } | |
| 1297 | |
| 1298 | |
| 1299 /* | |
| 1300 * Control saving of COM and APPn markers into marker_list. | |
| 1301 */ | |
| 1302 | |
| 1303 #ifdef SAVE_MARKERS_SUPPORTED | |
| 1304 | |
| 1305 GLOBAL(void) | |
| 1306 jpeg_save_markers (j_decompress_ptr cinfo, int marker_code, | |
| 1307 unsigned int length_limit) | |
| 1308 { | |
| 1309 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
| 1310 long maxlength; | |
| 1311 jpeg_marker_parser_method processor; | |
| 1312 | |
| 1313 /* Length limit mustn't be larger than what we can allocate | |
| 1314 * (should only be a concern in a 16-bit environment). | |
| 1315 */ | |
| 1316 maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct); | |
| 1317 if (((long) length_limit) > maxlength) | |
| 1318 length_limit = (unsigned int) maxlength; | |
| 1319 | |
| 1320 /* Choose processor routine to use. | |
| 1321 * APP0/APP14 have special requirements. | |
| 1322 */ | |
| 1323 if (length_limit) { | |
| 1324 processor = save_marker; | |
| 1325 /* If saving APP0/APP14, save at least enough for our internal use. */ | |
| 1326 if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN) | |
| 1327 length_limit = APP0_DATA_LEN; | |
| 1328 else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN) | |
| 1329 length_limit = APP14_DATA_LEN; | |
| 1330 } else { | |
| 1331 processor = skip_variable; | |
| 1332 /* If discarding APP0/APP14, use our regular on-the-fly processor. */ | |
| 1333 if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14) | |
| 1334 processor = get_interesting_appn; | |
| 1335 } | |
| 1336 | |
| 1337 if (marker_code == (int) M_COM) { | |
| 1338 marker->process_COM = processor; | |
| 1339 marker->length_limit_COM = length_limit; | |
| 1340 } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) { | |
| 1341 marker->process_APPn[marker_code - (int) M_APP0] = processor; | |
| 1342 marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit; | |
| 1343 } else | |
| 1344 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); | |
| 1345 } | |
| 1346 | |
| 1347 #endif /* SAVE_MARKERS_SUPPORTED */ | |
| 1348 | |
| 1349 | |
| 1350 /* | |
| 1351 * Install a special processing method for COM or APPn markers. | |
| 1352 */ | |
| 1353 | |
| 1354 GLOBAL(void) | |
| 1355 jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code, | |
| 1356 jpeg_marker_parser_method routine) | |
| 1357 { | |
| 1358 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
| 1359 | |
| 1360 if (marker_code == (int) M_COM) | |
| 1361 marker->process_COM = routine; | |
| 1362 else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) | |
| 1363 marker->process_APPn[marker_code - (int) M_APP0] = routine; | |
| 1364 else | |
| 1365 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); | |
| 1366 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1705523002:
Remove libjpeg and libjpeg_turbo. (Closed)
Base URL: https://github.com/domokit/mojo.git@master