Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdapimin.c |
| 3 | * |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1998, Thomas G. Lane. |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 6 | * It was modified by The libjpeg-turbo Project to include only code relevant |
| 7 | * to libjpeg-turbo. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 8 | * For conditions of distribution and use, see the accompanying README file. |
| 9 | * |
| 10 | * This file contains application interface code for the decompression half |
| 11 | * of the JPEG library. These are the "minimum" API routines that may be |
| 12 | * needed in either the normal full-decompression case or the |
| 13 | * transcoding-only case. |
| 14 | * |
| 15 | * Most of the routines intended to be called directly by an application |
| 16 | * are in this file or in jdapistd.c. But also see jcomapi.c for routines |
| 17 | * shared by compression and decompression, and jdtrans.c for the transcoding |
| 18 | * case. |
| 19 | */ |
| 20 | |
| 21 | #define JPEG_INTERNALS |
| 22 | #include "jinclude.h" |
| 23 | #include "jpeglib.h" |
| 24 | |
| 25 | |
| 26 | /* |
| 27 | * Initialization of a JPEG decompression object. |
| 28 | * The error manager must already be set up (in case memory manager fails). |
| 29 | */ |
| 30 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 31 | GLOBAL(void) |
| 32 | jpeg_CreateDecompress (j_decompress_ptr cinfo, int version, size_t structsize) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 33 | { |
| 34 | int i; |
| 35 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 36 | /* Guard against version mismatches between library and caller. */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 37 | cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 38 | if (version != JPEG_LIB_VERSION) |
| 39 | ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version); |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 40 | if (structsize != sizeof(struct jpeg_decompress_struct)) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 41 | ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 42 | (int) sizeof(struct jpeg_decompress_struct), (int) structsize); |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 43 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 44 | /* For debugging purposes, we zero the whole master structure. |
| 45 | * But the application has already set the err pointer, and may have set |
| 46 | * client_data, so we have to save and restore those fields. |
| 47 | * Note: if application hasn't set client_data, tools like Purify may |
| 48 | * complain here. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 49 | */ |
| 50 | { |
| 51 | struct jpeg_error_mgr * err = cinfo->err; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 52 | void * client_data = cinfo->client_data; /* ignore Purify complaint here */ |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 53 | MEMZERO(cinfo, sizeof(struct jpeg_decompress_struct)); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 54 | cinfo->err = err; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 55 | cinfo->client_data = client_data; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 56 | } |
| 57 | cinfo->is_decompressor = TRUE; |
| 58 | |
| 59 | /* Initialize a memory manager instance for this object */ |
| 60 | jinit_memory_mgr((j_common_ptr) cinfo); |
| 61 | |
| 62 | /* Zero out pointers to permanent structures. */ |
| 63 | cinfo->progress = NULL; |
| 64 | cinfo->src = NULL; |
| 65 | |
| 66 | for (i = 0; i < NUM_QUANT_TBLS; i++) |
| 67 | cinfo->quant_tbl_ptrs[i] = NULL; |
| 68 | |
| 69 | for (i = 0; i < NUM_HUFF_TBLS; i++) { |
| 70 | cinfo->dc_huff_tbl_ptrs[i] = NULL; |
| 71 | cinfo->ac_huff_tbl_ptrs[i] = NULL; |
| 72 | } |
| 73 | |
| 74 | /* Initialize marker processor so application can override methods |
| 75 | * for COM, APPn markers before calling jpeg_read_header. |
| 76 | */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 77 | cinfo->marker_list = NULL; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 78 | jinit_marker_reader(cinfo); |
| 79 | |
| 80 | /* And initialize the overall input controller. */ |
| 81 | jinit_input_controller(cinfo); |
| 82 | |
| 83 | /* OK, I'm ready */ |
| 84 | cinfo->global_state = DSTATE_START; |
| 85 | } |
| 86 | |
| 87 | |
| 88 | /* |
| 89 | * Destruction of a JPEG decompression object |
| 90 | */ |
| 91 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 92 | GLOBAL(void) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 93 | jpeg_destroy_decompress (j_decompress_ptr cinfo) |
| 94 | { |
| 95 | jpeg_destroy((j_common_ptr) cinfo); /* use common routine */ |
| 96 | } |
| 97 | |
| 98 | |
| 99 | /* |
| 100 | * Abort processing of a JPEG decompression operation, |
| 101 | * but don't destroy the object itself. |
| 102 | */ |
| 103 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 104 | GLOBAL(void) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 105 | jpeg_abort_decompress (j_decompress_ptr cinfo) |
| 106 | { |
| 107 | jpeg_abort((j_common_ptr) cinfo); /* use common routine */ |
| 108 | } |
| 109 | |
| 110 | |
| 111 | /* |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 112 | * Set default decompression parameters. |
| 113 | */ |
| 114 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 115 | LOCAL(void) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 116 | default_decompress_parms (j_decompress_ptr cinfo) |
| 117 | { |
| 118 | /* Guess the input colorspace, and set output colorspace accordingly. */ |
| 119 | /* (Wish JPEG committee had provided a real way to specify this...) */ |
| 120 | /* Note application may override our guesses. */ |
| 121 | switch (cinfo->num_components) { |
| 122 | case 1: |
| 123 | cinfo->jpeg_color_space = JCS_GRAYSCALE; |
| 124 | cinfo->out_color_space = JCS_GRAYSCALE; |
| 125 | break; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 126 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 127 | case 3: |
| 128 | if (cinfo->saw_JFIF_marker) { |
| 129 | cinfo->jpeg_color_space = JCS_YCbCr; /* JFIF implies YCbCr */ |
| 130 | } else if (cinfo->saw_Adobe_marker) { |
| 131 | switch (cinfo->Adobe_transform) { |
| 132 | case 0: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 133 | cinfo->jpeg_color_space = JCS_RGB; |
| 134 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 135 | case 1: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 136 | cinfo->jpeg_color_space = JCS_YCbCr; |
| 137 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 138 | default: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 139 | WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); |
| 140 | cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ |
| 141 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 142 | } |
| 143 | } else { |
| 144 | /* Saw no special markers, try to guess from the component IDs */ |
| 145 | int cid0 = cinfo->comp_info[0].component_id; |
| 146 | int cid1 = cinfo->comp_info[1].component_id; |
| 147 | int cid2 = cinfo->comp_info[2].component_id; |
| 148 | |
| 149 | if (cid0 == 1 && cid1 == 2 && cid2 == 3) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 150 | cinfo->jpeg_color_space = JCS_YCbCr; /* assume JFIF w/out marker */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 151 | else if (cid0 == 82 && cid1 == 71 && cid2 == 66) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 152 | cinfo->jpeg_color_space = JCS_RGB; /* ASCII 'R', 'G', 'B' */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 153 | else { |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 154 | TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2); |
| 155 | cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 156 | } |
| 157 | } |
| 158 | /* Always guess RGB is proper output colorspace. */ |
| 159 | cinfo->out_color_space = JCS_RGB; |
| 160 | break; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 161 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 162 | case 4: |
| 163 | if (cinfo->saw_Adobe_marker) { |
| 164 | switch (cinfo->Adobe_transform) { |
| 165 | case 0: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 166 | cinfo->jpeg_color_space = JCS_CMYK; |
| 167 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 168 | case 2: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 169 | cinfo->jpeg_color_space = JCS_YCCK; |
| 170 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 171 | default: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 172 | WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); |
| 173 | cinfo->jpeg_color_space = JCS_YCCK; /* assume it's YCCK */ |
| 174 | break; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 175 | } |
| 176 | } else { |
| 177 | /* No special markers, assume straight CMYK. */ |
| 178 | cinfo->jpeg_color_space = JCS_CMYK; |
| 179 | } |
| 180 | cinfo->out_color_space = JCS_CMYK; |
| 181 | break; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 182 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 183 | default: |
| 184 | cinfo->jpeg_color_space = JCS_UNKNOWN; |
| 185 | cinfo->out_color_space = JCS_UNKNOWN; |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | /* Set defaults for other decompression parameters. */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 190 | cinfo->scale_num = 1; /* 1:1 scaling */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 191 | cinfo->scale_denom = 1; |
| 192 | cinfo->output_gamma = 1.0; |
| 193 | cinfo->buffered_image = FALSE; |
| 194 | cinfo->raw_data_out = FALSE; |
| 195 | cinfo->dct_method = JDCT_DEFAULT; |
| 196 | cinfo->do_fancy_upsampling = TRUE; |
| 197 | cinfo->do_block_smoothing = TRUE; |
| 198 | cinfo->quantize_colors = FALSE; |
| 199 | /* We set these in case application only sets quantize_colors. */ |
| 200 | cinfo->dither_mode = JDITHER_FS; |
| 201 | #ifdef QUANT_2PASS_SUPPORTED |
| 202 | cinfo->two_pass_quantize = TRUE; |
| 203 | #else |
| 204 | cinfo->two_pass_quantize = FALSE; |
| 205 | #endif |
| 206 | cinfo->desired_number_of_colors = 256; |
| 207 | cinfo->colormap = NULL; |
| 208 | /* Initialize for no mode change in buffered-image mode. */ |
| 209 | cinfo->enable_1pass_quant = FALSE; |
| 210 | cinfo->enable_external_quant = FALSE; |
| 211 | cinfo->enable_2pass_quant = FALSE; |
| 212 | } |
| 213 | |
| 214 | |
| 215 | /* |
| 216 | * Decompression startup: read start of JPEG datastream to see what's there. |
| 217 | * Need only initialize JPEG object and supply a data source before calling. |
| 218 | * |
| 219 | * This routine will read as far as the first SOS marker (ie, actual start of |
| 220 | * compressed data), and will save all tables and parameters in the JPEG |
| 221 | * object. It will also initialize the decompression parameters to default |
| 222 | * values, and finally return JPEG_HEADER_OK. On return, the application may |
| 223 | * adjust the decompression parameters and then call jpeg_start_decompress. |
| 224 | * (Or, if the application only wanted to determine the image parameters, |
| 225 | * the data need not be decompressed. In that case, call jpeg_abort or |
| 226 | * jpeg_destroy to release any temporary space.) |
| 227 | * If an abbreviated (tables only) datastream is presented, the routine will |
| 228 | * return JPEG_HEADER_TABLES_ONLY upon reaching EOI. The application may then |
| 229 | * re-use the JPEG object to read the abbreviated image datastream(s). |
| 230 | * It is unnecessary (but OK) to call jpeg_abort in this case. |
| 231 | * The JPEG_SUSPENDED return code only occurs if the data source module |
| 232 | * requests suspension of the decompressor. In this case the application |
| 233 | * should load more source data and then re-call jpeg_read_header to resume |
| 234 | * processing. |
| 235 | * If a non-suspending data source is used and require_image is TRUE, then the |
| 236 | * return code need not be inspected since only JPEG_HEADER_OK is possible. |
| 237 | * |
| 238 | * This routine is now just a front end to jpeg_consume_input, with some |
| 239 | * extra error checking. |
| 240 | */ |
| 241 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 242 | GLOBAL(int) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 243 | jpeg_read_header (j_decompress_ptr cinfo, boolean require_image) |
| 244 | { |
| 245 | int retcode; |
| 246 | |
| 247 | if (cinfo->global_state != DSTATE_START && |
| 248 | cinfo->global_state != DSTATE_INHEADER) |
| 249 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 250 | |
| 251 | retcode = jpeg_consume_input(cinfo); |
| 252 | |
| 253 | switch (retcode) { |
| 254 | case JPEG_REACHED_SOS: |
| 255 | retcode = JPEG_HEADER_OK; |
| 256 | break; |
| 257 | case JPEG_REACHED_EOI: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 258 | if (require_image) /* Complain if application wanted an image */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 259 | ERREXIT(cinfo, JERR_NO_IMAGE); |
| 260 | /* Reset to start state; it would be safer to require the application to |
| 261 | * call jpeg_abort, but we can't change it now for compatibility reasons. |
| 262 | * A side effect is to free any temporary memory (there shouldn't be any). |
| 263 | */ |
| 264 | jpeg_abort((j_common_ptr) cinfo); /* sets state = DSTATE_START */ |
| 265 | retcode = JPEG_HEADER_TABLES_ONLY; |
| 266 | break; |
| 267 | case JPEG_SUSPENDED: |
| 268 | /* no work */ |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | return retcode; |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* |
| 277 | * Consume data in advance of what the decompressor requires. |
| 278 | * This can be called at any time once the decompressor object has |
| 279 | * been created and a data source has been set up. |
| 280 | * |
| 281 | * This routine is essentially a state machine that handles a couple |
| 282 | * of critical state-transition actions, namely initial setup and |
| 283 | * transition from header scanning to ready-for-start_decompress. |
| 284 | * All the actual input is done via the input controller's consume_input |
| 285 | * method. |
| 286 | */ |
| 287 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 288 | GLOBAL(int) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 289 | jpeg_consume_input (j_decompress_ptr cinfo) |
| 290 | { |
| 291 | int retcode = JPEG_SUSPENDED; |
| 292 | |
| 293 | /* NB: every possible DSTATE value should be listed in this switch */ |
| 294 | switch (cinfo->global_state) { |
| 295 | case DSTATE_START: |
| 296 | /* Start-of-datastream actions: reset appropriate modules */ |
| 297 | (*cinfo->inputctl->reset_input_controller) (cinfo); |
| 298 | /* Initialize application's data source module */ |
| 299 | (*cinfo->src->init_source) (cinfo); |
| 300 | cinfo->global_state = DSTATE_INHEADER; |
| 301 | /*FALLTHROUGH*/ |
| 302 | case DSTATE_INHEADER: |
| 303 | retcode = (*cinfo->inputctl->consume_input) (cinfo); |
| 304 | if (retcode == JPEG_REACHED_SOS) { /* Found SOS, prepare to decompress */ |
| 305 | /* Set up default parameters based on header data */ |
| 306 | default_decompress_parms(cinfo); |
| 307 | /* Set global state: ready for start_decompress */ |
| 308 | cinfo->global_state = DSTATE_READY; |
| 309 | } |
| 310 | break; |
| 311 | case DSTATE_READY: |
| 312 | /* Can't advance past first SOS until start_decompress is called */ |
| 313 | retcode = JPEG_REACHED_SOS; |
| 314 | break; |
| 315 | case DSTATE_PRELOAD: |
| 316 | case DSTATE_PRESCAN: |
| 317 | case DSTATE_SCANNING: |
| 318 | case DSTATE_RAW_OK: |
| 319 | case DSTATE_BUFIMAGE: |
| 320 | case DSTATE_BUFPOST: |
| 321 | case DSTATE_STOPPING: |
| 322 | retcode = (*cinfo->inputctl->consume_input) (cinfo); |
| 323 | break; |
| 324 | default: |
| 325 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 326 | } |
| 327 | return retcode; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | /* |
| 332 | * Have we finished reading the input file? |
| 333 | */ |
| 334 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 335 | GLOBAL(boolean) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 336 | jpeg_input_complete (j_decompress_ptr cinfo) |
| 337 | { |
| 338 | /* Check for valid jpeg object */ |
| 339 | if (cinfo->global_state < DSTATE_START || |
| 340 | cinfo->global_state > DSTATE_STOPPING) |
| 341 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 342 | return cinfo->inputctl->eoi_reached; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | /* |
| 347 | * Is there more than one scan? |
| 348 | */ |
| 349 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 350 | GLOBAL(boolean) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 351 | jpeg_has_multiple_scans (j_decompress_ptr cinfo) |
| 352 | { |
| 353 | /* Only valid after jpeg_read_header completes */ |
| 354 | if (cinfo->global_state < DSTATE_READY || |
| 355 | cinfo->global_state > DSTATE_STOPPING) |
| 356 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 357 | return cinfo->inputctl->has_multiple_scans; |
| 358 | } |
| 359 | |
| 360 | |
| 361 | /* |
| 362 | * Finish JPEG decompression. |
| 363 | * |
| 364 | * This will normally just verify the file trailer and release temp storage. |
| 365 | * |
| 366 | * Returns FALSE if suspended. The return value need be inspected only if |
| 367 | * a suspending data source is used. |
| 368 | */ |
| 369 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 370 | GLOBAL(boolean) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 371 | jpeg_finish_decompress (j_decompress_ptr cinfo) |
| 372 | { |
| 373 | if ((cinfo->global_state == DSTATE_SCANNING || |
| 374 | cinfo->global_state == DSTATE_RAW_OK) && ! cinfo->buffered_image) { |
| 375 | /* Terminate final pass of non-buffered mode */ |
| 376 | if (cinfo->output_scanline < cinfo->output_height) |
| 377 | ERREXIT(cinfo, JERR_TOO_LITTLE_DATA); |
| 378 | (*cinfo->master->finish_output_pass) (cinfo); |
| 379 | cinfo->global_state = DSTATE_STOPPING; |
| 380 | } else if (cinfo->global_state == DSTATE_BUFIMAGE) { |
| 381 | /* Finishing after a buffered-image operation */ |
| 382 | cinfo->global_state = DSTATE_STOPPING; |
| 383 | } else if (cinfo->global_state != DSTATE_STOPPING) { |
| 384 | /* STOPPING = repeat call after a suspension, anything else is error */ |
| 385 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 386 | } |
| 387 | /* Read until EOI */ |
| 388 | while (! cinfo->inputctl->eoi_reached) { |
| 389 | if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 390 | return FALSE; /* Suspend, come back later */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 391 | } |
| 392 | /* Do final cleanup */ |
| 393 | (*cinfo->src->term_source) (cinfo); |
| 394 | /* We can use jpeg_abort to release memory and reset global_state */ |
| 395 | jpeg_abort((j_common_ptr) cinfo); |
| 396 | return TRUE; |
| 397 | } |