| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (rpng.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #ifdef DEBUG |
| 24 | #include <stdio.h> |
| 25 | #endif |
| 26 | #include <stdint.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | #ifdef GEKKO |
| 31 | #include <malloc.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <boolean.h> |
| 35 | #include <formats/image.h> |
| 36 | #include <formats/rpng.h> |
| 37 | #include <streams/trans_stream.h> |
| 38 | #include <string/stdstring.h> |
| 39 | |
| 40 | #include "rpng_internal.h" |
| 41 | |
| 42 | enum png_ihdr_color_type |
| 43 | { |
| 44 | PNG_IHDR_COLOR_GRAY = 0, |
| 45 | PNG_IHDR_COLOR_RGB = 2, |
| 46 | PNG_IHDR_COLOR_PLT = 3, |
| 47 | PNG_IHDR_COLOR_GRAY_ALPHA = 4, |
| 48 | PNG_IHDR_COLOR_RGBA = 6 |
| 49 | }; |
| 50 | |
| 51 | enum png_line_filter |
| 52 | { |
| 53 | PNG_FILTER_NONE = 0, |
| 54 | PNG_FILTER_SUB, |
| 55 | PNG_FILTER_UP, |
| 56 | PNG_FILTER_AVERAGE, |
| 57 | PNG_FILTER_PAETH |
| 58 | }; |
| 59 | |
| 60 | enum png_chunk_type |
| 61 | { |
| 62 | PNG_CHUNK_NOOP = 0, |
| 63 | PNG_CHUNK_ERROR, |
| 64 | PNG_CHUNK_IHDR, |
| 65 | PNG_CHUNK_IDAT, |
| 66 | PNG_CHUNK_PLTE, |
| 67 | PNG_CHUNK_tRNS, |
| 68 | PNG_CHUNK_IEND |
| 69 | }; |
| 70 | |
| 71 | struct adam7_pass |
| 72 | { |
| 73 | unsigned x; |
| 74 | unsigned y; |
| 75 | unsigned stride_x; |
| 76 | unsigned stride_y; |
| 77 | }; |
| 78 | |
| 79 | struct idat_buffer |
| 80 | { |
| 81 | uint8_t *data; |
| 82 | size_t size; |
| 83 | }; |
| 84 | |
| 85 | enum rpng_process_flags |
| 86 | { |
| 87 | RPNG_PROCESS_FLAG_INFLATE_INITIALIZED = (1 << 0), |
| 88 | RPNG_PROCESS_FLAG_ADAM7_PASS_INITIALIZED = (1 << 1), |
| 89 | RPNG_PROCESS_FLAG_PASS_INITIALIZED = (1 << 2) |
| 90 | }; |
| 91 | |
| 92 | struct rpng_process |
| 93 | { |
| 94 | uint32_t *data; |
| 95 | uint32_t *palette; |
| 96 | void *stream; |
| 97 | const struct trans_stream_backend *stream_backend; |
| 98 | uint8_t *prev_scanline; |
| 99 | uint8_t *decoded_scanline; |
| 100 | uint8_t *inflate_buf; |
| 101 | size_t restore_buf_size; |
| 102 | size_t adam7_restore_buf_size; |
| 103 | size_t data_restore_buf_size; |
| 104 | size_t inflate_buf_size; |
| 105 | size_t avail_in; |
| 106 | size_t avail_out; |
| 107 | size_t total_out; |
| 108 | size_t pass_size; |
| 109 | struct png_ihdr ihdr; /* uint32_t alignment */ |
| 110 | unsigned bpp; |
| 111 | unsigned pitch; |
| 112 | unsigned h; |
| 113 | unsigned pass_width; |
| 114 | unsigned pass_height; |
| 115 | unsigned pass_pos; |
| 116 | uint8_t flags; |
| 117 | }; |
| 118 | |
| 119 | enum rpng_flags |
| 120 | { |
| 121 | RPNG_FLAG_HAS_IHDR = (1 << 0), |
| 122 | RPNG_FLAG_HAS_IDAT = (1 << 1), |
| 123 | RPNG_FLAG_HAS_IEND = (1 << 2), |
| 124 | RPNG_FLAG_HAS_PLTE = (1 << 3), |
| 125 | RPNG_FLAG_HAS_TRNS = (1 << 4) |
| 126 | }; |
| 127 | |
| 128 | struct rpng |
| 129 | { |
| 130 | struct rpng_process *process; |
| 131 | uint8_t *buff_data; |
| 132 | uint8_t *buff_end; |
| 133 | struct idat_buffer idat_buf; /* ptr alignment */ |
| 134 | struct png_ihdr ihdr; /* uint32 alignment */ |
| 135 | uint32_t palette[256]; |
| 136 | uint8_t flags; |
| 137 | }; |
| 138 | |
| 139 | static const struct adam7_pass rpng_passes[] = { |
| 140 | { 0, 0, 8, 8 }, |
| 141 | { 4, 0, 8, 8 }, |
| 142 | { 0, 4, 4, 8 }, |
| 143 | { 2, 0, 4, 4 }, |
| 144 | { 0, 2, 2, 4 }, |
| 145 | { 1, 0, 2, 2 }, |
| 146 | { 0, 1, 1, 2 }, |
| 147 | }; |
| 148 | |
| 149 | static INLINE uint32_t rpng_dword_be(const uint8_t *buf) |
| 150 | { |
| 151 | return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | (buf[3] << 0); |
| 152 | } |
| 153 | |
| 154 | #if defined(DEBUG) || defined(RPNG_TEST) |
| 155 | static bool rpng_process_ihdr(struct png_ihdr *ihdr) |
| 156 | { |
| 157 | uint8_t ihdr_depth = ihdr->depth; |
| 158 | |
| 159 | switch (ihdr->color_type) |
| 160 | { |
| 161 | case PNG_IHDR_COLOR_RGB: |
| 162 | case PNG_IHDR_COLOR_GRAY_ALPHA: |
| 163 | case PNG_IHDR_COLOR_RGBA: |
| 164 | if (ihdr_depth != 8 && ihdr_depth != 16) |
| 165 | { |
| 166 | fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); |
| 167 | return false; |
| 168 | } |
| 169 | break; |
| 170 | case PNG_IHDR_COLOR_GRAY: |
| 171 | /* Valid bitdepths are: 1, 2, 4, 8, 16 */ |
| 172 | if (ihdr_depth > 16 || (0x977F7FFF << ihdr_depth) & 0x80000000) |
| 173 | { |
| 174 | fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); |
| 175 | return false; |
| 176 | } |
| 177 | break; |
| 178 | case PNG_IHDR_COLOR_PLT: |
| 179 | /* Valid bitdepths are: 1, 2, 4, 8 */ |
| 180 | if (ihdr_depth > 8 || (0x977F7FFF << ihdr_depth) & 0x80000000) |
| 181 | { |
| 182 | fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); |
| 183 | return false; |
| 184 | } |
| 185 | break; |
| 186 | default: |
| 187 | fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | #ifdef RPNG_TEST |
| 192 | fprintf(stderr, "IHDR: (%u x %u), bpc = %u, palette = %s, color = %s, alpha = %s, adam7 = %s.\n", |
| 193 | ihdr->width, ihdr->height, |
| 194 | ihdr_depth, (ihdr->color_type == PNG_IHDR_COLOR_PLT) ? "yes" : "no", |
| 195 | (ihdr->color_type & PNG_IHDR_COLOR_RGB) ? "yes" : "no", |
| 196 | (ihdr->color_type & PNG_IHDR_COLOR_GRAY_ALPHA) ? "yes" : "no", |
| 197 | ihdr->interlace == 1 ? "yes" : "no"); |
| 198 | #endif |
| 199 | |
| 200 | return true; |
| 201 | } |
| 202 | #else |
| 203 | static bool rpng_process_ihdr(struct png_ihdr *ihdr) |
| 204 | { |
| 205 | uint8_t ihdr_depth = ihdr->depth; |
| 206 | |
| 207 | switch (ihdr->color_type) |
| 208 | { |
| 209 | case PNG_IHDR_COLOR_RGB: |
| 210 | case PNG_IHDR_COLOR_GRAY_ALPHA: |
| 211 | case PNG_IHDR_COLOR_RGBA: |
| 212 | if (ihdr_depth != 8 && ihdr_depth != 16) |
| 213 | return false; |
| 214 | break; |
| 215 | case PNG_IHDR_COLOR_GRAY: |
| 216 | /* Valid bitdepths are: 1, 2, 4, 8, 16 */ |
| 217 | if (ihdr_depth > 16 || (0x977F7FFF << ihdr_depth) & 0x80000000) |
| 218 | return false; |
| 219 | break; |
| 220 | case PNG_IHDR_COLOR_PLT: |
| 221 | /* Valid bitdepths are: 1, 2, 4, 8 */ |
| 222 | if (ihdr_depth > 8 || (0x977F7FFF << ihdr_depth) & 0x80000000) |
| 223 | return false; |
| 224 | break; |
| 225 | default: |
| 226 | return false; |
| 227 | } |
| 228 | |
| 229 | return true; |
| 230 | } |
| 231 | #endif |
| 232 | |
| 233 | static void rpng_reverse_filter_copy_line_rgb(uint32_t *data, |
| 234 | const uint8_t *decoded, unsigned width, unsigned bpp) |
| 235 | { |
| 236 | int i; |
| 237 | |
| 238 | bpp /= 8; |
| 239 | |
| 240 | for (i = 0; i < (int)width; i++) |
| 241 | { |
| 242 | uint32_t r, g, b; |
| 243 | |
| 244 | r = *decoded; |
| 245 | decoded += bpp; |
| 246 | g = *decoded; |
| 247 | decoded += bpp; |
| 248 | b = *decoded; |
| 249 | decoded += bpp; |
| 250 | data[i] = (0xffu << 24) | (r << 16) | (g << 8) | (b << 0); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | static void rpng_reverse_filter_copy_line_rgba(uint32_t *data, |
| 255 | const uint8_t *decoded, unsigned width, unsigned bpp) |
| 256 | { |
| 257 | int i; |
| 258 | |
| 259 | bpp /= 8; |
| 260 | |
| 261 | for (i = 0; i < (int)width; i++) |
| 262 | { |
| 263 | uint32_t r, g, b, a; |
| 264 | r = *decoded; |
| 265 | decoded += bpp; |
| 266 | g = *decoded; |
| 267 | decoded += bpp; |
| 268 | b = *decoded; |
| 269 | decoded += bpp; |
| 270 | a = *decoded; |
| 271 | decoded += bpp; |
| 272 | data[i] = (a << 24) | (r << 16) | (g << 8) | (b << 0); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | static void rpng_reverse_filter_copy_line_bw(uint32_t *data, |
| 277 | const uint8_t *decoded, unsigned width, unsigned depth) |
| 278 | { |
| 279 | int i; |
| 280 | unsigned bit; |
| 281 | static const unsigned mul_table[] = { 0, 0xff, 0x55, 0, 0x11, 0, 0, 0, 0x01 }; |
| 282 | unsigned mul, mask; |
| 283 | |
| 284 | if (depth == 16) |
| 285 | { |
| 286 | for (i = 0; i < (int)width; i++) |
| 287 | { |
| 288 | uint32_t val = decoded[i << 1]; |
| 289 | data[i] = (val * 0x010101) | (0xffu << 24); |
| 290 | } |
| 291 | return; |
| 292 | } |
| 293 | |
| 294 | mul = mul_table[depth]; |
| 295 | mask = (1 << depth) - 1; |
| 296 | bit = 0; |
| 297 | |
| 298 | for (i = 0; i < (int)width; i++, bit += depth) |
| 299 | { |
| 300 | unsigned byte = bit >> 3; |
| 301 | unsigned val = decoded[byte] >> (8 - depth - (bit & 7)); |
| 302 | |
| 303 | val &= mask; |
| 304 | val *= mul; |
| 305 | data[i] = (val * 0x010101) | (0xffu << 24); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | static void rpng_reverse_filter_copy_line_gray_alpha(uint32_t *data, |
| 310 | const uint8_t *decoded, unsigned width, |
| 311 | unsigned bpp) |
| 312 | { |
| 313 | int i; |
| 314 | |
| 315 | bpp /= 8; |
| 316 | |
| 317 | for (i = 0; i < (int)width; i++) |
| 318 | { |
| 319 | uint32_t gray, alpha; |
| 320 | |
| 321 | gray = *decoded; |
| 322 | decoded += bpp; |
| 323 | alpha = *decoded; |
| 324 | decoded += bpp; |
| 325 | |
| 326 | data[i] = (gray * 0x010101) | (alpha << 24); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static void rpng_reverse_filter_copy_line_plt(uint32_t *data, |
| 331 | const uint8_t *decoded, unsigned width, |
| 332 | unsigned depth, const uint32_t *palette) |
| 333 | { |
| 334 | switch (depth) |
| 335 | { |
| 336 | case 1: |
| 337 | { |
| 338 | int i; |
| 339 | unsigned w = width / 8; |
| 340 | for (i = 0; i < (int)w; i++, decoded++) |
| 341 | { |
| 342 | *data++ = palette[(*decoded >> 7) & 1]; |
| 343 | *data++ = palette[(*decoded >> 6) & 1]; |
| 344 | *data++ = palette[(*decoded >> 5) & 1]; |
| 345 | *data++ = palette[(*decoded >> 4) & 1]; |
| 346 | *data++ = palette[(*decoded >> 3) & 1]; |
| 347 | *data++ = palette[(*decoded >> 2) & 1]; |
| 348 | *data++ = palette[(*decoded >> 1) & 1]; |
| 349 | *data++ = palette[*decoded & 1]; |
| 350 | } |
| 351 | |
| 352 | switch (width & 7) |
| 353 | { |
| 354 | case 7: |
| 355 | data[6] = palette[(*decoded >> 1) & 1]; |
| 356 | case 6: |
| 357 | data[5] = palette[(*decoded >> 2) & 1]; |
| 358 | case 5: |
| 359 | data[4] = palette[(*decoded >> 3) & 1]; |
| 360 | case 4: |
| 361 | data[3] = palette[(*decoded >> 4) & 1]; |
| 362 | case 3: |
| 363 | data[2] = palette[(*decoded >> 5) & 1]; |
| 364 | case 2: |
| 365 | data[1] = palette[(*decoded >> 6) & 1]; |
| 366 | case 1: |
| 367 | data[0] = palette[(*decoded >> 7) & 1]; |
| 368 | break; |
| 369 | } |
| 370 | } |
| 371 | break; |
| 372 | |
| 373 | case 2: |
| 374 | { |
| 375 | int i; |
| 376 | unsigned w = width / 4; |
| 377 | for (i = 0; i < (int)w; i++, decoded++) |
| 378 | { |
| 379 | *data++ = palette[(*decoded >> 6) & 3]; |
| 380 | *data++ = palette[(*decoded >> 4) & 3]; |
| 381 | *data++ = palette[(*decoded >> 2) & 3]; |
| 382 | *data++ = palette[*decoded & 3]; |
| 383 | } |
| 384 | |
| 385 | switch (width & 3) |
| 386 | { |
| 387 | case 3: |
| 388 | data[2] = palette[(*decoded >> 2) & 3]; |
| 389 | case 2: |
| 390 | data[1] = palette[(*decoded >> 4) & 3]; |
| 391 | case 1: |
| 392 | data[0] = palette[(*decoded >> 6) & 3]; |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | break; |
| 397 | |
| 398 | case 4: |
| 399 | { |
| 400 | int i; |
| 401 | unsigned w = width / 2; |
| 402 | for (i = 0; i < (int)w; i++, decoded++) |
| 403 | { |
| 404 | *data++ = palette[*decoded >> 4]; |
| 405 | *data++ = palette[*decoded & 0x0f]; |
| 406 | } |
| 407 | |
| 408 | if (width & 1) |
| 409 | *data = palette[*decoded >> 4]; |
| 410 | } |
| 411 | break; |
| 412 | |
| 413 | case 8: |
| 414 | { |
| 415 | int i; |
| 416 | for (i = 0; i < (int)width; i++, decoded++, data++) |
| 417 | *data = palette[*decoded]; |
| 418 | } |
| 419 | break; |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | static void rpng_pass_geom(const struct png_ihdr *ihdr, |
| 424 | unsigned width, unsigned height, |
| 425 | unsigned *bpp_out, unsigned *pitch_out, size_t *pass_size) |
| 426 | { |
| 427 | unsigned bpp = 0; |
| 428 | unsigned pitch = 0; |
| 429 | |
| 430 | switch (ihdr->color_type) |
| 431 | { |
| 432 | case PNG_IHDR_COLOR_GRAY: |
| 433 | bpp = (ihdr->depth + 7) / 8; |
| 434 | pitch = (ihdr->width * ihdr->depth + 7) / 8; |
| 435 | break; |
| 436 | case PNG_IHDR_COLOR_RGB: |
| 437 | bpp = (ihdr->depth * 3 + 7) / 8; |
| 438 | pitch = (ihdr->width * ihdr->depth * 3 + 7) / 8; |
| 439 | break; |
| 440 | case PNG_IHDR_COLOR_PLT: |
| 441 | bpp = (ihdr->depth + 7) / 8; |
| 442 | pitch = (ihdr->width * ihdr->depth + 7) / 8; |
| 443 | break; |
| 444 | case PNG_IHDR_COLOR_GRAY_ALPHA: |
| 445 | bpp = (ihdr->depth * 2 + 7) / 8; |
| 446 | pitch = (ihdr->width * ihdr->depth * 2 + 7) / 8; |
| 447 | break; |
| 448 | case PNG_IHDR_COLOR_RGBA: |
| 449 | bpp = (ihdr->depth * 4 + 7) / 8; |
| 450 | pitch = (ihdr->width * ihdr->depth * 4 + 7) / 8; |
| 451 | break; |
| 452 | default: |
| 453 | break; |
| 454 | } |
| 455 | |
| 456 | if (pass_size) |
| 457 | *pass_size = (pitch + 1) * ihdr->height; |
| 458 | if (bpp_out) |
| 459 | *bpp_out = bpp; |
| 460 | if (pitch_out) |
| 461 | *pitch_out = pitch; |
| 462 | } |
| 463 | |
| 464 | static void rpng_reverse_filter_adam7_deinterlace_pass(uint32_t *data, |
| 465 | const struct png_ihdr *ihdr, |
| 466 | const uint32_t *input, unsigned pass_width, unsigned pass_height, |
| 467 | const struct adam7_pass *pass) |
| 468 | { |
| 469 | unsigned x, y; |
| 470 | |
| 471 | data += pass->y * ihdr->width + pass->x; |
| 472 | |
| 473 | for (y = 0; y < pass_height; |
| 474 | y++, data += ihdr->width * pass->stride_y, input += pass_width) |
| 475 | { |
| 476 | uint32_t *out = data; |
| 477 | |
| 478 | for (x = 0; x < pass_width; x++, out += pass->stride_x) |
| 479 | *out = input[x]; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | static void rpng_reverse_filter_deinit(struct rpng_process *pngp) |
| 484 | { |
| 485 | if (!pngp) |
| 486 | return; |
| 487 | if (pngp->decoded_scanline) |
| 488 | free(pngp->decoded_scanline); |
| 489 | pngp->decoded_scanline = NULL; |
| 490 | if (pngp->prev_scanline) |
| 491 | free(pngp->prev_scanline); |
| 492 | pngp->prev_scanline = NULL; |
| 493 | |
| 494 | pngp->flags &= ~RPNG_PROCESS_FLAG_PASS_INITIALIZED; |
| 495 | pngp->h = 0; |
| 496 | } |
| 497 | |
| 498 | static int rpng_reverse_filter_init(const struct png_ihdr *ihdr, |
| 499 | struct rpng_process *pngp) |
| 500 | { |
| 501 | size_t pass_size; |
| 502 | |
| 503 | if ( !(pngp->flags & RPNG_PROCESS_FLAG_ADAM7_PASS_INITIALIZED) |
| 504 | && ihdr->interlace) |
| 505 | { |
| 506 | if ( ihdr->width <= rpng_passes[pngp->pass_pos].x |
| 507 | || ihdr->height <= rpng_passes[pngp->pass_pos].y) /* Empty pass */ |
| 508 | return 1; |
| 509 | |
| 510 | pngp->pass_width = (ihdr->width - |
| 511 | rpng_passes[pngp->pass_pos].x + rpng_passes[pngp->pass_pos].stride_x |
| 512 | - 1) / rpng_passes[pngp->pass_pos].stride_x; |
| 513 | pngp->pass_height = (ihdr->height - rpng_passes[pngp->pass_pos].y + |
| 514 | rpng_passes[pngp->pass_pos].stride_y - 1) / rpng_passes[pngp->pass_pos].stride_y; |
| 515 | |
| 516 | if (!(pngp->data = (uint32_t*)malloc( |
| 517 | pngp->pass_width * pngp->pass_height * sizeof(uint32_t)))) |
| 518 | return -1; |
| 519 | |
| 520 | pngp->ihdr = *ihdr; |
| 521 | pngp->ihdr.width = pngp->pass_width; |
| 522 | pngp->ihdr.height = pngp->pass_height; |
| 523 | |
| 524 | rpng_pass_geom(&pngp->ihdr, pngp->pass_width, |
| 525 | pngp->pass_height, NULL, NULL, &pngp->pass_size); |
| 526 | |
| 527 | if (pngp->pass_size > pngp->total_out) |
| 528 | { |
| 529 | free(pngp->data); |
| 530 | pngp->data = NULL; |
| 531 | return -1; |
| 532 | } |
| 533 | |
| 534 | pngp->flags |= RPNG_PROCESS_FLAG_ADAM7_PASS_INITIALIZED; |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | if (pngp->flags & RPNG_PROCESS_FLAG_PASS_INITIALIZED) |
| 540 | return 0; |
| 541 | |
| 542 | rpng_pass_geom(ihdr, ihdr->width, ihdr->height, &pngp->bpp, &pngp->pitch, &pass_size); |
| 543 | |
| 544 | if (pngp->total_out < pass_size) |
| 545 | return -1; |
| 546 | |
| 547 | pngp->restore_buf_size = 0; |
| 548 | pngp->data_restore_buf_size = 0; |
| 549 | pngp->prev_scanline = (uint8_t*)calloc(1, pngp->pitch); |
| 550 | pngp->decoded_scanline = (uint8_t*)calloc(1, pngp->pitch); |
| 551 | |
| 552 | if (!pngp->prev_scanline || !pngp->decoded_scanline) |
| 553 | goto error; |
| 554 | |
| 555 | pngp->h = 0; |
| 556 | pngp->flags |= RPNG_PROCESS_FLAG_PASS_INITIALIZED; |
| 557 | |
| 558 | return 0; |
| 559 | |
| 560 | error: |
| 561 | rpng_reverse_filter_deinit(pngp); |
| 562 | return -1; |
| 563 | } |
| 564 | |
| 565 | static int rpng_reverse_filter_copy_line(uint32_t *data, |
| 566 | const struct png_ihdr *ihdr, |
| 567 | struct rpng_process *pngp, unsigned filter) |
| 568 | { |
| 569 | unsigned i; |
| 570 | |
| 571 | switch (filter) |
| 572 | { |
| 573 | case PNG_FILTER_NONE: |
| 574 | memcpy(pngp->decoded_scanline, pngp->inflate_buf, pngp->pitch); |
| 575 | break; |
| 576 | case PNG_FILTER_SUB: |
| 577 | memcpy(pngp->decoded_scanline, pngp->inflate_buf, pngp->pitch); |
| 578 | for (i = pngp->bpp; i < pngp->pitch; i++) |
| 579 | pngp->decoded_scanline[i] += pngp->decoded_scanline[i - pngp->bpp]; |
| 580 | break; |
| 581 | case PNG_FILTER_UP: |
| 582 | memcpy(pngp->decoded_scanline, pngp->inflate_buf, pngp->pitch); |
| 583 | for (i = 0; i < pngp->pitch; i++) |
| 584 | pngp->decoded_scanline[i] += pngp->prev_scanline[i]; |
| 585 | break; |
| 586 | case PNG_FILTER_AVERAGE: |
| 587 | memcpy(pngp->decoded_scanline, pngp->inflate_buf, pngp->pitch); |
| 588 | for (i = 0; i < pngp->bpp; i++) |
| 589 | { |
| 590 | uint8_t avg = pngp->prev_scanline[i] >> 1; |
| 591 | pngp->decoded_scanline[i] += avg; |
| 592 | } |
| 593 | for (i = pngp->bpp; i < pngp->pitch; i++) |
| 594 | { |
| 595 | uint8_t avg = (pngp->decoded_scanline[i - pngp->bpp] + pngp->prev_scanline[i]) >> 1; |
| 596 | pngp->decoded_scanline[i] += avg; |
| 597 | } |
| 598 | break; |
| 599 | case PNG_FILTER_PAETH: |
| 600 | memcpy(pngp->decoded_scanline, pngp->inflate_buf, pngp->pitch); |
| 601 | for (i = 0; i < pngp->bpp; i++) |
| 602 | pngp->decoded_scanline[i] += pngp->prev_scanline[i]; |
| 603 | for (i = pngp->bpp; i < pngp->pitch; i++) |
| 604 | pngp->decoded_scanline[i] += paeth(pngp->decoded_scanline[i - pngp->bpp], |
| 605 | pngp->prev_scanline[i], pngp->prev_scanline[i - pngp->bpp]); |
| 606 | break; |
| 607 | default: |
| 608 | return IMAGE_PROCESS_ERROR_END; |
| 609 | } |
| 610 | |
| 611 | switch (ihdr->color_type) |
| 612 | { |
| 613 | case PNG_IHDR_COLOR_GRAY: |
| 614 | rpng_reverse_filter_copy_line_bw(data, pngp->decoded_scanline, ihdr->width, ihdr->depth); |
| 615 | break; |
| 616 | case PNG_IHDR_COLOR_RGB: |
| 617 | rpng_reverse_filter_copy_line_rgb(data, pngp->decoded_scanline, ihdr->width, ihdr->depth); |
| 618 | break; |
| 619 | case PNG_IHDR_COLOR_PLT: |
| 620 | rpng_reverse_filter_copy_line_plt( |
| 621 | data, pngp->decoded_scanline, ihdr->width, |
| 622 | ihdr->depth, pngp->palette); |
| 623 | break; |
| 624 | case PNG_IHDR_COLOR_GRAY_ALPHA: |
| 625 | rpng_reverse_filter_copy_line_gray_alpha(data, pngp->decoded_scanline, ihdr->width, |
| 626 | ihdr->depth); |
| 627 | break; |
| 628 | case PNG_IHDR_COLOR_RGBA: |
| 629 | rpng_reverse_filter_copy_line_rgba(data, pngp->decoded_scanline, ihdr->width, ihdr->depth); |
| 630 | break; |
| 631 | } |
| 632 | |
| 633 | memcpy(pngp->prev_scanline, pngp->decoded_scanline, pngp->pitch); |
| 634 | |
| 635 | return IMAGE_PROCESS_NEXT; |
| 636 | } |
| 637 | |
| 638 | static int rpng_reverse_filter_regular_iterate( |
| 639 | uint32_t **data, const struct png_ihdr *ihdr, |
| 640 | struct rpng_process *pngp) |
| 641 | { |
| 642 | int ret = IMAGE_PROCESS_END; |
| 643 | if (pngp->h < ihdr->height) |
| 644 | { |
| 645 | unsigned filter = *pngp->inflate_buf++; |
| 646 | pngp->restore_buf_size += 1; |
| 647 | ret = rpng_reverse_filter_copy_line(*data, |
| 648 | ihdr, pngp, filter); |
| 649 | if (ret == IMAGE_PROCESS_END || ret == IMAGE_PROCESS_ERROR_END) |
| 650 | goto end; |
| 651 | } |
| 652 | else |
| 653 | goto end; |
| 654 | |
| 655 | pngp->h++; |
| 656 | pngp->inflate_buf += pngp->pitch; |
| 657 | pngp->restore_buf_size += pngp->pitch; |
| 658 | |
| 659 | *data += ihdr->width; |
| 660 | pngp->data_restore_buf_size += ihdr->width; |
| 661 | |
| 662 | return IMAGE_PROCESS_NEXT; |
| 663 | |
| 664 | end: |
| 665 | rpng_reverse_filter_deinit(pngp); |
| 666 | |
| 667 | pngp->inflate_buf -= pngp->restore_buf_size; |
| 668 | *data -= pngp->data_restore_buf_size; |
| 669 | pngp->data_restore_buf_size = 0; |
| 670 | return ret; |
| 671 | } |
| 672 | |
| 673 | static int rpng_reverse_filter_adam7_iterate(uint32_t **data_, |
| 674 | const struct png_ihdr *ihdr, |
| 675 | struct rpng_process *pngp) |
| 676 | { |
| 677 | int ret = 0; |
| 678 | bool to_next = pngp->pass_pos < ARRAY_SIZE(rpng_passes); |
| 679 | uint32_t *data = *data_; |
| 680 | |
| 681 | if (!to_next) |
| 682 | return IMAGE_PROCESS_END; |
| 683 | |
| 684 | if ((ret = rpng_reverse_filter_init(ihdr, pngp)) == 1) |
| 685 | return IMAGE_PROCESS_NEXT; |
| 686 | else if (ret == -1) |
| 687 | return IMAGE_PROCESS_ERROR_END; |
| 688 | |
| 689 | if (rpng_reverse_filter_init(&pngp->ihdr, pngp) == -1) |
| 690 | return IMAGE_PROCESS_ERROR; |
| 691 | |
| 692 | do |
| 693 | { |
| 694 | ret = rpng_reverse_filter_regular_iterate(&pngp->data, |
| 695 | &pngp->ihdr, pngp); |
| 696 | } while (ret == IMAGE_PROCESS_NEXT); |
| 697 | |
| 698 | if (ret == IMAGE_PROCESS_ERROR || ret == IMAGE_PROCESS_ERROR_END) |
| 699 | return IMAGE_PROCESS_ERROR; |
| 700 | |
| 701 | pngp->inflate_buf += pngp->pass_size; |
| 702 | pngp->adam7_restore_buf_size += pngp->pass_size; |
| 703 | |
| 704 | pngp->total_out -= pngp->pass_size; |
| 705 | |
| 706 | rpng_reverse_filter_adam7_deinterlace_pass(data, |
| 707 | ihdr, pngp->data, pngp->pass_width, pngp->pass_height, |
| 708 | &rpng_passes[pngp->pass_pos]); |
| 709 | |
| 710 | free(pngp->data); |
| 711 | |
| 712 | pngp->data = NULL; |
| 713 | pngp->pass_width = 0; |
| 714 | pngp->pass_height = 0; |
| 715 | pngp->pass_size = 0; |
| 716 | pngp->flags &= ~RPNG_PROCESS_FLAG_ADAM7_PASS_INITIALIZED; |
| 717 | |
| 718 | return IMAGE_PROCESS_NEXT; |
| 719 | } |
| 720 | |
| 721 | static int rpng_reverse_filter_adam7(uint32_t **data_, |
| 722 | const struct png_ihdr *ihdr, |
| 723 | struct rpng_process *pngp) |
| 724 | { |
| 725 | int ret = rpng_reverse_filter_adam7_iterate(data_, |
| 726 | ihdr, pngp); |
| 727 | |
| 728 | switch (ret) |
| 729 | { |
| 730 | case IMAGE_PROCESS_ERROR_END: |
| 731 | case IMAGE_PROCESS_END: |
| 732 | break; |
| 733 | case IMAGE_PROCESS_NEXT: |
| 734 | pngp->pass_pos++; |
| 735 | return 0; |
| 736 | case IMAGE_PROCESS_ERROR: |
| 737 | if (pngp->data) |
| 738 | { |
| 739 | free(pngp->data); |
| 740 | pngp->data = NULL; |
| 741 | } |
| 742 | pngp->inflate_buf -= pngp->adam7_restore_buf_size; |
| 743 | pngp->adam7_restore_buf_size = 0; |
| 744 | return -1; |
| 745 | } |
| 746 | |
| 747 | pngp->inflate_buf -= pngp->adam7_restore_buf_size; |
| 748 | pngp->adam7_restore_buf_size = 0; |
| 749 | return ret; |
| 750 | } |
| 751 | |
| 752 | static int rpng_load_image_argb_process_inflate_init( |
| 753 | rpng_t *rpng, uint32_t **data) |
| 754 | { |
| 755 | bool zstatus; |
| 756 | enum trans_stream_error terror; |
| 757 | uint32_t rd, wn; |
| 758 | struct rpng_process *process = (struct rpng_process*)rpng->process; |
| 759 | bool to_continue = (process->avail_in > 0 |
| 760 | && process->avail_out > 0); |
| 761 | |
| 762 | if (!to_continue) |
| 763 | goto end; |
| 764 | |
| 765 | zstatus = process->stream_backend->trans(process->stream, false, &rd, &wn, &terror); |
| 766 | |
| 767 | if (!zstatus && terror != TRANS_STREAM_ERROR_BUFFER_FULL) |
| 768 | goto error; |
| 769 | |
| 770 | process->avail_in -= rd; |
| 771 | process->avail_out -= wn; |
| 772 | process->total_out += wn; |
| 773 | |
| 774 | if (terror) |
| 775 | return 0; |
| 776 | |
| 777 | end: |
| 778 | process->stream_backend->stream_free(process->stream); |
| 779 | process->stream = NULL; |
| 780 | |
| 781 | #ifdef GEKKO |
| 782 | /* we often use these in textures, make sure they're 32-byte aligned */ |
| 783 | *data = (uint32_t*)memalign(32, rpng->ihdr.width * |
| 784 | rpng->ihdr.height * sizeof(uint32_t)); |
| 785 | #else |
| 786 | *data = (uint32_t*)malloc(rpng->ihdr.width * |
| 787 | rpng->ihdr.height * sizeof(uint32_t)); |
| 788 | #endif |
| 789 | if (!*data) |
| 790 | goto false_end; |
| 791 | |
| 792 | process->adam7_restore_buf_size = 0; |
| 793 | process->restore_buf_size = 0; |
| 794 | process->palette = rpng->palette; |
| 795 | |
| 796 | if (rpng->ihdr.interlace != 1) |
| 797 | if (rpng_reverse_filter_init(&rpng->ihdr, process) == -1) |
| 798 | goto false_end; |
| 799 | |
| 800 | process->flags |= RPNG_PROCESS_FLAG_INFLATE_INITIALIZED; |
| 801 | return 1; |
| 802 | |
| 803 | error: |
| 804 | false_end: |
| 805 | process->flags &= ~RPNG_PROCESS_FLAG_INFLATE_INITIALIZED; |
| 806 | return -1; |
| 807 | } |
| 808 | |
| 809 | static bool rpng_realloc_idat(struct idat_buffer *buf, uint32_t chunk_size) |
| 810 | { |
| 811 | uint8_t *new_buffer = (uint8_t*)realloc(buf->data, buf->size + chunk_size); |
| 812 | |
| 813 | if (!new_buffer) |
| 814 | return false; |
| 815 | |
| 816 | buf->data = new_buffer; |
| 817 | return true; |
| 818 | } |
| 819 | |
| 820 | static struct rpng_process *rpng_process_init(rpng_t *rpng) |
| 821 | { |
| 822 | uint8_t *inflate_buf = NULL; |
| 823 | struct rpng_process *process = (struct rpng_process*)malloc(sizeof(*process)); |
| 824 | |
| 825 | if (!process) |
| 826 | return NULL; |
| 827 | |
| 828 | process->flags = 0; |
| 829 | process->prev_scanline = NULL; |
| 830 | process->decoded_scanline = NULL; |
| 831 | process->inflate_buf = NULL; |
| 832 | |
| 833 | process->ihdr.width = 0; |
| 834 | process->ihdr.height = 0; |
| 835 | process->ihdr.depth = 0; |
| 836 | process->ihdr.color_type = 0; |
| 837 | process->ihdr.compression = 0; |
| 838 | process->ihdr.filter = 0; |
| 839 | process->ihdr.interlace = 0; |
| 840 | |
| 841 | process->restore_buf_size = 0; |
| 842 | process->adam7_restore_buf_size = 0; |
| 843 | process->data_restore_buf_size = 0; |
| 844 | process->inflate_buf_size = 0; |
| 845 | process->avail_in = 0; |
| 846 | process->avail_out = 0; |
| 847 | process->total_out = 0; |
| 848 | process->pass_size = 0; |
| 849 | process->bpp = 0; |
| 850 | process->pitch = 0; |
| 851 | process->h = 0; |
| 852 | process->pass_width = 0; |
| 853 | process->pass_height = 0; |
| 854 | process->pass_pos = 0; |
| 855 | process->data = 0; |
| 856 | process->palette = 0; |
| 857 | process->stream = NULL; |
| 858 | process->stream_backend = trans_stream_get_zlib_inflate_backend(); |
| 859 | |
| 860 | rpng_pass_geom(&rpng->ihdr, rpng->ihdr.width, |
| 861 | rpng->ihdr.height, NULL, NULL, &process->inflate_buf_size); |
| 862 | if (rpng->ihdr.interlace == 1) /* To be sure. */ |
| 863 | process->inflate_buf_size *= 2; |
| 864 | |
| 865 | process->stream = process->stream_backend->stream_new(); |
| 866 | |
| 867 | if (!process->stream) |
| 868 | { |
| 869 | free(process); |
| 870 | return NULL; |
| 871 | } |
| 872 | |
| 873 | inflate_buf = (uint8_t*)malloc(process->inflate_buf_size); |
| 874 | if (!inflate_buf) |
| 875 | goto error; |
| 876 | |
| 877 | process->inflate_buf = inflate_buf; |
| 878 | process->avail_in = rpng->idat_buf.size; |
| 879 | process->avail_out = process->inflate_buf_size; |
| 880 | |
| 881 | process->stream_backend->set_in( |
| 882 | process->stream, |
| 883 | rpng->idat_buf.data, |
| 884 | (uint32_t)rpng->idat_buf.size); |
| 885 | process->stream_backend->set_out( |
| 886 | process->stream, |
| 887 | process->inflate_buf, |
| 888 | (uint32_t)process->inflate_buf_size); |
| 889 | |
| 890 | return process; |
| 891 | |
| 892 | error: |
| 893 | if (process) |
| 894 | { |
| 895 | if (process->stream) |
| 896 | process->stream_backend->stream_free(process->stream); |
| 897 | free(process); |
| 898 | } |
| 899 | return NULL; |
| 900 | } |
| 901 | |
| 902 | /** |
| 903 | * rpng_read_chunk_header: |
| 904 | * |
| 905 | * Leaf function. |
| 906 | * |
| 907 | * @return The PNG type of the memory chunk (i.e. IHDR, IDAT, IEND, |
| 908 | PLTE, and/or tRNS) |
| 909 | **/ |
| 910 | static enum png_chunk_type rpng_read_chunk_header( |
| 911 | uint8_t *buf, uint32_t chunk_size) |
| 912 | { |
| 913 | int i; |
| 914 | char type[4]; |
| 915 | |
| 916 | for (i = 0; i < 4; i++) |
| 917 | { |
| 918 | uint8_t byte = buf[i + 4]; |
| 919 | |
| 920 | /* All four bytes of the chunk type must be |
| 921 | * ASCII letters (codes 65-90 and 97-122) */ |
| 922 | if ((byte < 65) || ((byte > 90) && (byte < 97)) || (byte > 122)) |
| 923 | return PNG_CHUNK_ERROR; |
| 924 | type[i] = byte; |
| 925 | } |
| 926 | |
| 927 | if ( |
| 928 | type[0] == 'I' |
| 929 | && type[1] == 'H' |
| 930 | && type[2] == 'D' |
| 931 | && type[3] == 'R' |
| 932 | ) |
| 933 | return PNG_CHUNK_IHDR; |
| 934 | else if |
| 935 | ( |
| 936 | type[0] == 'I' |
| 937 | && type[1] == 'D' |
| 938 | && type[2] == 'A' |
| 939 | && type[3] == 'T' |
| 940 | ) |
| 941 | return PNG_CHUNK_IDAT; |
| 942 | else if |
| 943 | ( |
| 944 | type[0] == 'I' |
| 945 | && type[1] == 'E' |
| 946 | && type[2] == 'N' |
| 947 | && type[3] == 'D' |
| 948 | ) |
| 949 | return PNG_CHUNK_IEND; |
| 950 | else if |
| 951 | ( |
| 952 | type[0] == 'P' |
| 953 | && type[1] == 'L' |
| 954 | && type[2] == 'T' |
| 955 | && type[3] == 'E' |
| 956 | ) |
| 957 | return PNG_CHUNK_PLTE; |
| 958 | else if |
| 959 | ( |
| 960 | type[0] == 't' |
| 961 | && type[1] == 'R' |
| 962 | && type[2] == 'N' |
| 963 | && type[3] == 'S' |
| 964 | ) |
| 965 | return PNG_CHUNK_tRNS; |
| 966 | |
| 967 | return PNG_CHUNK_NOOP; |
| 968 | } |
| 969 | |
| 970 | bool rpng_iterate_image(rpng_t *rpng) |
| 971 | { |
| 972 | unsigned i; |
| 973 | uint8_t *buf = (uint8_t*)rpng->buff_data; |
| 974 | uint32_t chunk_size = 0; |
| 975 | |
| 976 | /* Check whether data buffer pointer is valid */ |
| 977 | if (buf > rpng->buff_end) |
| 978 | return false; |
| 979 | |
| 980 | /* Check whether reading the header will overflow |
| 981 | * the data buffer */ |
| 982 | if (rpng->buff_end - buf < 8) |
| 983 | return false; |
| 984 | |
| 985 | chunk_size = rpng_dword_be(buf); |
| 986 | |
| 987 | /* Check whether chunk will overflow the data buffer */ |
| 988 | if (buf + 8 + chunk_size > rpng->buff_end) |
| 989 | return false; |
| 990 | |
| 991 | switch (rpng_read_chunk_header(buf, chunk_size)) |
| 992 | { |
| 993 | case PNG_CHUNK_NOOP: |
| 994 | default: |
| 995 | break; |
| 996 | |
| 997 | case PNG_CHUNK_ERROR: |
| 998 | return false; |
| 999 | |
| 1000 | case PNG_CHUNK_IHDR: |
| 1001 | if ( (rpng->flags & RPNG_FLAG_HAS_IHDR) |
| 1002 | || (rpng->flags & RPNG_FLAG_HAS_IDAT) |
| 1003 | || (rpng->flags & RPNG_FLAG_HAS_IEND)) |
| 1004 | return false; |
| 1005 | |
| 1006 | if (chunk_size != 13) |
| 1007 | return false; |
| 1008 | |
| 1009 | buf += 4 + 4; |
| 1010 | |
| 1011 | rpng->ihdr.width = rpng_dword_be(buf + 0); |
| 1012 | rpng->ihdr.height = rpng_dword_be(buf + 4); |
| 1013 | rpng->ihdr.depth = buf[8]; |
| 1014 | rpng->ihdr.color_type = buf[9]; |
| 1015 | rpng->ihdr.compression = buf[10]; |
| 1016 | rpng->ihdr.filter = buf[11]; |
| 1017 | rpng->ihdr.interlace = buf[12]; |
| 1018 | |
| 1019 | if ( rpng->ihdr.width == 0 |
| 1020 | || rpng->ihdr.height == 0 |
| 1021 | /* ensure multiplications don't overflow and wrap around, that'd give buffer overflow crashes */ |
| 1022 | || (uint64_t)rpng->ihdr.width*rpng->ihdr.height*sizeof(uint32_t) >= 0x80000000) |
| 1023 | return false; |
| 1024 | |
| 1025 | if (!rpng_process_ihdr(&rpng->ihdr)) |
| 1026 | return false; |
| 1027 | |
| 1028 | if (rpng->ihdr.compression != 0) |
| 1029 | { |
| 1030 | #if defined(DEBUG) || defined(RPNG_TEST) |
| 1031 | fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); |
| 1032 | #endif |
| 1033 | return false; |
| 1034 | } |
| 1035 | |
| 1036 | rpng->flags |= RPNG_FLAG_HAS_IHDR; |
| 1037 | break; |
| 1038 | |
| 1039 | case PNG_CHUNK_PLTE: |
| 1040 | { |
| 1041 | int i; |
| 1042 | unsigned entries = chunk_size / 3; |
| 1043 | |
| 1044 | if (entries > 256) |
| 1045 | return false; |
| 1046 | if (chunk_size % 3) |
| 1047 | return false; |
| 1048 | |
| 1049 | if ( !(rpng->flags & RPNG_FLAG_HAS_IHDR) |
| 1050 | || (rpng->flags & RPNG_FLAG_HAS_PLTE) |
| 1051 | || (rpng->flags & RPNG_FLAG_HAS_IEND) |
| 1052 | || (rpng->flags & RPNG_FLAG_HAS_IDAT) |
| 1053 | || (rpng->flags & RPNG_FLAG_HAS_TRNS)) |
| 1054 | return false; |
| 1055 | |
| 1056 | buf += 8; |
| 1057 | |
| 1058 | for (i = 0; i < (int)entries; i++) |
| 1059 | { |
| 1060 | uint32_t r = buf[3 * i + 0]; |
| 1061 | uint32_t g = buf[3 * i + 1]; |
| 1062 | uint32_t b = buf[3 * i + 2]; |
| 1063 | rpng->palette[i] = (r << 16) | (g << 8) | (b << 0) | (0xffu << 24); |
| 1064 | } |
| 1065 | |
| 1066 | rpng->flags |= RPNG_FLAG_HAS_PLTE; |
| 1067 | } |
| 1068 | break; |
| 1069 | |
| 1070 | case PNG_CHUNK_tRNS: |
| 1071 | if (rpng->flags & RPNG_FLAG_HAS_IDAT) |
| 1072 | return false; |
| 1073 | |
| 1074 | if (rpng->ihdr.color_type == PNG_IHDR_COLOR_PLT) |
| 1075 | { |
| 1076 | int i; |
| 1077 | uint32_t *palette; |
| 1078 | /* we should compare with the number of palette entries */ |
| 1079 | if (chunk_size > 256) |
| 1080 | return false; |
| 1081 | |
| 1082 | buf += 8; |
| 1083 | palette = rpng->palette; |
| 1084 | |
| 1085 | for (i = 0; i < (int)chunk_size; i++, buf++, palette++) |
| 1086 | *palette = (*palette & 0x00ffffff) | (unsigned)*buf << 24; |
| 1087 | } |
| 1088 | /* TODO: support colorkey in grayscale and truecolor images */ |
| 1089 | |
| 1090 | rpng->flags |= RPNG_FLAG_HAS_TRNS; |
| 1091 | break; |
| 1092 | |
| 1093 | case PNG_CHUNK_IDAT: |
| 1094 | if ( !(rpng->flags & RPNG_FLAG_HAS_IHDR) |
| 1095 | || (rpng->flags & RPNG_FLAG_HAS_IEND) |
| 1096 | || (rpng->ihdr.color_type == PNG_IHDR_COLOR_PLT |
| 1097 | && |
| 1098 | !(rpng->flags & RPNG_FLAG_HAS_PLTE))) |
| 1099 | return false; |
| 1100 | |
| 1101 | if (!rpng_realloc_idat(&rpng->idat_buf, chunk_size)) |
| 1102 | return false; |
| 1103 | |
| 1104 | buf += 8; |
| 1105 | |
| 1106 | for (i = 0; i < chunk_size; i++) |
| 1107 | rpng->idat_buf.data[i + rpng->idat_buf.size] = buf[i]; |
| 1108 | |
| 1109 | rpng->idat_buf.size += chunk_size; |
| 1110 | |
| 1111 | rpng->flags |= RPNG_FLAG_HAS_IDAT; |
| 1112 | break; |
| 1113 | |
| 1114 | case PNG_CHUNK_IEND: |
| 1115 | if ( !(rpng->flags & RPNG_FLAG_HAS_IHDR) |
| 1116 | || !(rpng->flags & RPNG_FLAG_HAS_IDAT)) |
| 1117 | return false; |
| 1118 | |
| 1119 | rpng->flags |= RPNG_FLAG_HAS_IEND; |
| 1120 | return false; |
| 1121 | } |
| 1122 | |
| 1123 | rpng->buff_data += chunk_size + 12; |
| 1124 | |
| 1125 | /* Check whether data buffer pointer is valid */ |
| 1126 | if (rpng->buff_data > rpng->buff_end) |
| 1127 | return false; |
| 1128 | return true; |
| 1129 | } |
| 1130 | |
| 1131 | int rpng_process_image(rpng_t *rpng, |
| 1132 | void **_data, size_t size, unsigned *width, unsigned *height) |
| 1133 | { |
| 1134 | uint32_t **data = (uint32_t**)_data; |
| 1135 | |
| 1136 | if (!rpng->process) |
| 1137 | { |
| 1138 | struct rpng_process *process = rpng_process_init(rpng); |
| 1139 | |
| 1140 | if (!process) |
| 1141 | goto error; |
| 1142 | |
| 1143 | rpng->process = process; |
| 1144 | return IMAGE_PROCESS_NEXT; |
| 1145 | } |
| 1146 | |
| 1147 | if (!(rpng->process->flags & RPNG_PROCESS_FLAG_INFLATE_INITIALIZED)) |
| 1148 | { |
| 1149 | if (rpng_load_image_argb_process_inflate_init(rpng, data) == -1) |
| 1150 | goto error; |
| 1151 | return IMAGE_PROCESS_NEXT; |
| 1152 | } |
| 1153 | |
| 1154 | *width = rpng->ihdr.width; |
| 1155 | *height = rpng->ihdr.height; |
| 1156 | |
| 1157 | if (rpng->ihdr.interlace && rpng->process) |
| 1158 | return rpng_reverse_filter_adam7(data, &rpng->ihdr, rpng->process); |
| 1159 | return rpng_reverse_filter_regular_iterate(data, &rpng->ihdr, rpng->process); |
| 1160 | |
| 1161 | error: |
| 1162 | if (rpng->process) |
| 1163 | { |
| 1164 | if (rpng->process->inflate_buf) |
| 1165 | free(rpng->process->inflate_buf); |
| 1166 | if (rpng->process->stream) |
| 1167 | rpng->process->stream_backend->stream_free(rpng->process->stream); |
| 1168 | free(rpng->process); |
| 1169 | rpng->process = NULL; |
| 1170 | } |
| 1171 | return IMAGE_PROCESS_ERROR; |
| 1172 | } |
| 1173 | |
| 1174 | void rpng_free(rpng_t *rpng) |
| 1175 | { |
| 1176 | if (!rpng) |
| 1177 | return; |
| 1178 | |
| 1179 | if (rpng->idat_buf.data) |
| 1180 | free(rpng->idat_buf.data); |
| 1181 | if (rpng->process) |
| 1182 | { |
| 1183 | if (rpng->process->inflate_buf) |
| 1184 | free(rpng->process->inflate_buf); |
| 1185 | if (rpng->process->stream) |
| 1186 | { |
| 1187 | if (rpng->process->stream_backend && rpng->process->stream_backend->stream_free) |
| 1188 | rpng->process->stream_backend->stream_free(rpng->process->stream); |
| 1189 | else |
| 1190 | free(rpng->process->stream); |
| 1191 | } |
| 1192 | free(rpng->process); |
| 1193 | } |
| 1194 | |
| 1195 | free(rpng); |
| 1196 | } |
| 1197 | |
| 1198 | bool rpng_start(rpng_t *rpng) |
| 1199 | { |
| 1200 | if (!rpng) |
| 1201 | return false; |
| 1202 | |
| 1203 | /* Check whether reading the header will overflow |
| 1204 | * the data buffer */ |
| 1205 | if (rpng->buff_end - rpng->buff_data < 8) |
| 1206 | return false; |
| 1207 | |
| 1208 | if (string_is_not_equal_fast( |
| 1209 | rpng->buff_data, png_magic, sizeof(png_magic))) |
| 1210 | return false; |
| 1211 | |
| 1212 | rpng->buff_data += 8; |
| 1213 | |
| 1214 | return true; |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * rpng_is_valid: |
| 1219 | * |
| 1220 | * Check if @rpng is a valid PNG image. |
| 1221 | * Must contain an IHDR chunk, one or more IDAT |
| 1222 | * chunks, and an IEND chunk. |
| 1223 | * |
| 1224 | * Leaf function. |
| 1225 | * |
| 1226 | * @return true if it's a valid PNG image, otherwise false. |
| 1227 | **/ |
| 1228 | bool rpng_is_valid(rpng_t *rpng) |
| 1229 | { |
| 1230 | return (rpng && ((rpng->flags & (RPNG_FLAG_HAS_IHDR | RPNG_FLAG_HAS_IDAT | |
| 1231 | RPNG_FLAG_HAS_IEND)) > 0)); |
| 1232 | } |
| 1233 | |
| 1234 | bool rpng_set_buf_ptr(rpng_t *rpng, void *data, size_t len) |
| 1235 | { |
| 1236 | if (!rpng || (len < 1)) |
| 1237 | return false; |
| 1238 | |
| 1239 | rpng->buff_data = (uint8_t*)data; |
| 1240 | rpng->buff_end = rpng->buff_data + (len - 1); |
| 1241 | |
| 1242 | return true; |
| 1243 | } |
| 1244 | |
| 1245 | rpng_t *rpng_alloc(void) |
| 1246 | { |
| 1247 | rpng_t *rpng = (rpng_t*)calloc(1, sizeof(*rpng)); |
| 1248 | if (!rpng) |
| 1249 | return NULL; |
| 1250 | return rpng; |
| 1251 | } |