Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 1 | // Copyright 2014 PDFium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 | |
| 7 | #include "core/fxcodec/lgif/fx_gif.h" |
| 8 | |
| 9 | #include "core/fxcodec/lbmp/fx_bmp.h" |
| 10 | #include "third_party/base/stl_util.h" |
| 11 | |
| 12 | void CGifLZWDecoder::Input(uint8_t* src_buf, uint32_t src_size) { |
| 13 | next_in = src_buf; |
| 14 | avail_in = src_size; |
| 15 | } |
| 16 | |
| 17 | uint32_t CGifLZWDecoder::GetAvailInput() { |
| 18 | return avail_in; |
| 19 | } |
| 20 | |
| 21 | CGifLZWDecoder::CGifLZWDecoder(FX_CHAR* error_ptr) |
| 22 | : code_size(0), |
| 23 | code_size_cur(0), |
| 24 | code_clear(0), |
| 25 | code_end(0), |
| 26 | code_next(0), |
| 27 | code_first(0), |
| 28 | stack_size(0), |
| 29 | code_old(0), |
| 30 | next_in(nullptr), |
| 31 | avail_in(0), |
| 32 | bits_left(0), |
| 33 | code_store(0), |
| 34 | err_msg_ptr(error_ptr) {} |
| 35 | |
| 36 | CGifLZWDecoder::~CGifLZWDecoder() {} |
| 37 | |
| 38 | void CGifLZWDecoder::InitTable(uint8_t code_len) { |
| 39 | code_size = code_len; |
| 40 | ASSERT(code_size < 32); |
| 41 | code_clear = 1 << code_size; |
| 42 | code_end = code_clear + 1; |
| 43 | bits_left = 0; |
| 44 | code_store = 0; |
| 45 | next_in = nullptr; |
| 46 | avail_in = 0; |
| 47 | stack_size = 0; |
| 48 | code_first = 0; |
| 49 | ClearTable(); |
| 50 | } |
| 51 | void CGifLZWDecoder::ClearTable() { |
| 52 | code_size_cur = code_size + 1; |
| 53 | code_next = code_end + 1; |
| 54 | code_old = (uint16_t)-1; |
| 55 | FXSYS_memset(code_table, 0, sizeof(tag_Table) * GIF_MAX_LZW_CODE); |
| 56 | FXSYS_memset(stack, 0, GIF_MAX_LZW_CODE); |
| 57 | for (uint16_t i = 0; i < code_clear; i++) { |
| 58 | code_table[i].suffix = (uint8_t)i; |
| 59 | } |
| 60 | } |
| 61 | void CGifLZWDecoder::DecodeString(uint16_t code) { |
| 62 | stack_size = 0; |
| 63 | while (true) { |
| 64 | ASSERT(code <= code_next); |
| 65 | if (code < code_clear || code > code_next) { |
| 66 | break; |
| 67 | } |
| 68 | stack[GIF_MAX_LZW_CODE - 1 - stack_size++] = code_table[code].suffix; |
| 69 | code = code_table[code].prefix; |
| 70 | } |
| 71 | stack[GIF_MAX_LZW_CODE - 1 - stack_size++] = (uint8_t)code; |
| 72 | code_first = (uint8_t)code; |
| 73 | } |
| 74 | void CGifLZWDecoder::AddCode(uint16_t prefix_code, uint8_t append_char) { |
| 75 | if (code_next == GIF_MAX_LZW_CODE) { |
| 76 | return; |
| 77 | } |
| 78 | code_table[code_next].prefix = prefix_code; |
| 79 | code_table[code_next].suffix = append_char; |
| 80 | if (++code_next < GIF_MAX_LZW_CODE) { |
| 81 | if (code_next >> code_size_cur) { |
| 82 | code_size_cur++; |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | int32_t CGifLZWDecoder::Decode(uint8_t* des_buf, uint32_t& des_size) { |
| 87 | if (des_size == 0) { |
| 88 | return 3; |
| 89 | } |
| 90 | uint32_t i = 0; |
| 91 | if (stack_size != 0) { |
| 92 | if (des_size < stack_size) { |
| 93 | FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], des_size); |
| 94 | stack_size -= (uint16_t)des_size; |
| 95 | return 3; |
| 96 | } |
| 97 | FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], stack_size); |
| 98 | des_buf += stack_size; |
| 99 | i += stack_size; |
| 100 | stack_size = 0; |
| 101 | } |
| 102 | uint16_t code = 0; |
| 103 | while (i <= des_size && (avail_in > 0 || bits_left >= code_size_cur)) { |
| 104 | if (code_size_cur > 12) { |
| 105 | if (err_msg_ptr) { |
| 106 | FXSYS_strncpy(err_msg_ptr, "Code Length Out Of Range", |
| 107 | GIF_MAX_ERROR_SIZE - 1); |
| 108 | } |
| 109 | return 0; |
| 110 | } |
| 111 | if (avail_in > 0) { |
| 112 | if (bits_left > 31) { |
| 113 | if (err_msg_ptr) |
| 114 | FXSYS_strncpy(err_msg_ptr, "Decode Error", GIF_MAX_ERROR_SIZE - 1); |
| 115 | return 0; |
| 116 | } |
| 117 | code_store |= (*next_in++) << bits_left; |
| 118 | avail_in--; |
| 119 | bits_left += 8; |
| 120 | } |
| 121 | while (bits_left >= code_size_cur) { |
| 122 | code = (uint16_t)code_store & ((1 << code_size_cur) - 1); |
| 123 | code_store >>= code_size_cur; |
| 124 | bits_left -= code_size_cur; |
| 125 | if (code == code_clear) { |
| 126 | ClearTable(); |
| 127 | continue; |
| 128 | } else if (code >= code_end) { |
| 129 | des_size = i; |
| 130 | return 1; |
| 131 | } else { |
| 132 | if (code_old != (uint16_t)-1) { |
| 133 | if (code_next < GIF_MAX_LZW_CODE) { |
| 134 | if (code == code_next) { |
| 135 | AddCode(code_old, code_first); |
| 136 | DecodeString(code); |
| 137 | } else if (code > code_next) { |
| 138 | if (err_msg_ptr) { |
| 139 | FXSYS_strncpy(err_msg_ptr, "Decode Error, Out Of Range", |
| 140 | GIF_MAX_ERROR_SIZE - 1); |
| 141 | } |
| 142 | return 0; |
| 143 | } else { |
| 144 | DecodeString(code); |
| 145 | uint8_t append_char = stack[GIF_MAX_LZW_CODE - stack_size]; |
| 146 | AddCode(code_old, append_char); |
| 147 | } |
| 148 | } |
| 149 | } else { |
| 150 | DecodeString(code); |
| 151 | } |
| 152 | code_old = code; |
| 153 | if (i + stack_size > des_size) { |
| 154 | FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], |
| 155 | des_size - i); |
| 156 | stack_size -= (uint16_t)(des_size - i); |
| 157 | return 3; |
| 158 | } |
| 159 | FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], |
| 160 | stack_size); |
| 161 | des_buf += stack_size; |
| 162 | i += stack_size; |
| 163 | stack_size = 0; |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | if (avail_in == 0) { |
| 168 | des_size = i; |
| 169 | return 2; |
| 170 | } |
| 171 | return 0; |
| 172 | } |
| 173 | static bool gif_grow_buf(uint8_t*& dst_buf, uint32_t& dst_len, uint32_t size) { |
| 174 | if (dst_len < size) { |
| 175 | uint32_t len_org = dst_len; |
| 176 | while (dst_buf && dst_len < size) { |
| 177 | dst_len <<= 1; |
| 178 | // TODO(thestig): Probably should be a try-realloc here. |
| 179 | dst_buf = FX_Realloc(uint8_t, dst_buf, dst_len); |
| 180 | } |
| 181 | if (!dst_buf) { |
| 182 | dst_len = size; |
| 183 | dst_buf = FX_Realloc(uint8_t, dst_buf, dst_len); |
| 184 | } |
| 185 | FXSYS_memset(dst_buf + len_org, 0, dst_len - len_org); |
| 186 | return !!dst_buf; |
| 187 | } |
| 188 | return true; |
| 189 | } |
| 190 | static inline void gif_cut_index(uint8_t& val, |
| 191 | uint32_t index, |
| 192 | uint8_t index_bit, |
| 193 | uint8_t index_bit_use, |
| 194 | uint8_t bit_use) { |
| 195 | uint32_t cut = ((1 << (index_bit - index_bit_use)) - 1) << index_bit_use; |
| 196 | val |= ((index & cut) >> index_bit_use) << bit_use; |
| 197 | } |
| 198 | static inline uint8_t gif_cut_buf(const uint8_t* buf, |
| 199 | uint32_t& offset, |
| 200 | uint8_t bit_cut, |
| 201 | uint8_t& bit_offset, |
| 202 | uint32_t& bit_num) { |
| 203 | if (bit_cut != 8) { |
| 204 | uint16_t index = 0; |
| 205 | index |= ((1 << bit_cut) - 1) << (7 - bit_offset); |
| 206 | uint8_t ret = ((index & buf[offset]) >> (7 - bit_offset)); |
| 207 | bit_offset += bit_cut; |
| 208 | if (bit_offset >= 8) { |
| 209 | if (bit_offset > 8) { |
| 210 | ret |= ((index & (buf[offset + 1] << 8)) >> 8); |
| 211 | } |
| 212 | bit_offset -= 8; |
| 213 | offset++; |
| 214 | } |
| 215 | bit_num += bit_cut; |
| 216 | return ret; |
| 217 | } |
| 218 | bit_num += bit_cut; |
| 219 | return buf[offset++]; |
| 220 | } |
| 221 | CGifLZWEncoder::CGifLZWEncoder() { |
| 222 | FXSYS_memset(this, 0, sizeof(CGifLZWEncoder)); |
| 223 | } |
| 224 | CGifLZWEncoder::~CGifLZWEncoder() {} |
| 225 | void CGifLZWEncoder::ClearTable() { |
| 226 | index_bit_cur = code_size + 1; |
| 227 | index_num = code_end + 1; |
| 228 | table_cur = code_end + 1; |
| 229 | for (uint16_t i = 0; i < GIF_MAX_LZW_CODE; i++) { |
| 230 | code_table[i].prefix = 0; |
| 231 | code_table[i].suffix = 0; |
| 232 | } |
| 233 | } |
| 234 | void CGifLZWEncoder::Start(uint8_t code_len, |
| 235 | const uint8_t* src_buf, |
| 236 | uint8_t*& dst_buf, |
| 237 | uint32_t& offset) { |
| 238 | code_size = code_len + 1; |
| 239 | ASSERT(code_size < 32); |
| 240 | src_bit_cut = code_size; |
| 241 | if (code_len == 0) { |
| 242 | src_bit_cut = 1; |
| 243 | code_size = 2; |
| 244 | } |
| 245 | code_clear = 1 << code_size; |
| 246 | code_end = code_clear + 1; |
| 247 | dst_buf[offset++] = code_size; |
| 248 | bit_offset = 0; |
| 249 | ClearTable(); |
| 250 | src_offset = 0; |
| 251 | src_bit_offset = 0; |
| 252 | src_bit_num = 0; |
| 253 | code_table[index_num].prefix = gif_cut_buf(src_buf, src_offset, src_bit_cut, |
| 254 | src_bit_offset, src_bit_num); |
| 255 | code_table[index_num].suffix = gif_cut_buf(src_buf, src_offset, src_bit_cut, |
| 256 | src_bit_offset, src_bit_num); |
| 257 | } |
| 258 | void CGifLZWEncoder::WriteBlock(uint8_t*& dst_buf, |
| 259 | uint32_t& dst_len, |
| 260 | uint32_t& offset) { |
| 261 | if (!gif_grow_buf(dst_buf, dst_len, offset + GIF_DATA_BLOCK + 1)) { |
| 262 | longjmp(jmp, 1); |
| 263 | } |
| 264 | dst_buf[offset++] = index_buf_len; |
| 265 | FXSYS_memcpy(&dst_buf[offset], index_buf, index_buf_len); |
| 266 | offset += index_buf_len; |
| 267 | FXSYS_memset(index_buf, 0, GIF_DATA_BLOCK); |
| 268 | index_buf_len = 0; |
| 269 | } |
| 270 | void CGifLZWEncoder::EncodeString(uint32_t index, |
| 271 | uint8_t*& dst_buf, |
| 272 | uint32_t& dst_len, |
| 273 | uint32_t& offset) { |
| 274 | uint8_t index_bit_use; |
| 275 | index_bit_use = 0; |
| 276 | if (index_buf_len == GIF_DATA_BLOCK) { |
| 277 | WriteBlock(dst_buf, dst_len, offset); |
| 278 | } |
| 279 | gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use, |
| 280 | bit_offset); |
| 281 | if (index_bit_cur <= (8 - bit_offset)) { |
| 282 | bit_offset += index_bit_cur; |
| 283 | } else if (index_bit_cur <= (16 - bit_offset)) { |
| 284 | index_bit_use += (8 - bit_offset); |
| 285 | bit_offset = 0; |
| 286 | index_buf_len++; |
| 287 | if (index_buf_len == GIF_DATA_BLOCK) { |
| 288 | WriteBlock(dst_buf, dst_len, offset); |
| 289 | } |
| 290 | gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use, |
| 291 | bit_offset); |
| 292 | bit_offset = index_bit_cur - index_bit_use; |
| 293 | } else { |
| 294 | index_bit_use += (8 - bit_offset); |
| 295 | bit_offset = 0; |
| 296 | index_buf_len++; |
| 297 | if (index_buf_len == GIF_DATA_BLOCK) { |
| 298 | WriteBlock(dst_buf, dst_len, offset); |
| 299 | } |
| 300 | gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use, |
| 301 | bit_offset); |
| 302 | index_bit_use += 8; |
| 303 | bit_offset = 0; |
| 304 | index_buf_len++; |
| 305 | if (index_buf_len == GIF_DATA_BLOCK) { |
| 306 | WriteBlock(dst_buf, dst_len, offset); |
| 307 | } |
| 308 | gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use, |
| 309 | bit_offset); |
| 310 | bit_offset = index_bit_cur - index_bit_use; |
| 311 | } |
| 312 | if (bit_offset == 8) { |
| 313 | bit_offset = 0; |
| 314 | index_buf_len++; |
| 315 | if (index_buf_len == GIF_DATA_BLOCK) { |
| 316 | WriteBlock(dst_buf, dst_len, offset); |
| 317 | } |
| 318 | } |
| 319 | if (index == code_end) { |
| 320 | index_buf_len++; |
| 321 | WriteBlock(dst_buf, dst_len, offset); |
| 322 | } |
| 323 | if (index_num++ >> index_bit_cur) { |
| 324 | index_bit_cur++; |
| 325 | } |
| 326 | } |
| 327 | bool CGifLZWEncoder::Encode(const uint8_t* src_buf, |
| 328 | uint32_t src_len, |
| 329 | uint8_t*& dst_buf, |
| 330 | uint32_t& dst_len, |
| 331 | uint32_t& offset) { |
| 332 | uint8_t suffix; |
| 333 | if (setjmp(jmp)) { |
| 334 | return false; |
| 335 | } |
| 336 | while (src_bit_num < src_len) { |
| 337 | if (!LookUpInTable(src_buf, src_offset, src_bit_offset)) { |
| 338 | EncodeString(code_table[index_num].prefix, dst_buf, dst_len, offset); |
| 339 | if (index_num == GIF_MAX_LZW_CODE) { |
| 340 | suffix = code_table[index_num - 1].suffix; |
| 341 | EncodeString(code_clear, dst_buf, dst_len, offset); |
| 342 | ClearTable(); |
| 343 | code_table[index_num].prefix = suffix; |
| 344 | code_table[index_num].suffix = gif_cut_buf( |
| 345 | src_buf, src_offset, src_bit_cut, src_bit_offset, src_bit_num); |
| 346 | } else { |
| 347 | code_table[index_num].prefix = code_table[index_num - 1].suffix; |
| 348 | code_table[index_num].suffix = gif_cut_buf( |
| 349 | src_buf, src_offset, src_bit_cut, src_bit_offset, src_bit_num); |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | src_offset = 0; |
| 354 | src_bit_offset = 0; |
| 355 | src_bit_num = 0; |
| 356 | return true; |
| 357 | } |
| 358 | bool CGifLZWEncoder::LookUpInTable(const uint8_t* buf, |
| 359 | uint32_t& offset, |
| 360 | uint8_t& out_bit_offset) { |
| 361 | for (uint16_t i = table_cur; i < index_num; i++) { |
| 362 | if (code_table[i].prefix == code_table[index_num].prefix && |
| 363 | code_table[i].suffix == code_table[index_num].suffix) { |
| 364 | code_table[index_num].prefix = i; |
| 365 | code_table[index_num].suffix = |
| 366 | gif_cut_buf(buf, offset, src_bit_cut, out_bit_offset, src_bit_num); |
| 367 | table_cur = i; |
| 368 | return true; |
| 369 | } |
| 370 | } |
| 371 | table_cur = code_end + 1; |
| 372 | return false; |
| 373 | } |
| 374 | void CGifLZWEncoder::Finish(uint8_t*& dst_buf, |
| 375 | uint32_t& dst_len, |
| 376 | uint32_t& offset) { |
| 377 | EncodeString(code_table[index_num].prefix, dst_buf, dst_len, offset); |
| 378 | EncodeString(code_end, dst_buf, dst_len, offset); |
| 379 | bit_offset = 0; |
| 380 | ClearTable(); |
| 381 | } |
| 382 | gif_decompress_struct_p gif_create_decompress() { |
| 383 | gif_decompress_struct_p gif_ptr = FX_Alloc(gif_decompress_struct, 1); |
| 384 | FXSYS_memset(gif_ptr, 0, sizeof(gif_decompress_struct)); |
| 385 | gif_ptr->decode_status = GIF_D_STATUS_SIG; |
| 386 | gif_ptr->img_ptr_arr_ptr = new std::vector<GifImage*>; |
| 387 | gif_ptr->cmt_data_ptr = new CFX_ByteString; |
| 388 | gif_ptr->pt_ptr_arr_ptr = new std::vector<GifPlainText*>; |
| 389 | return gif_ptr; |
| 390 | } |
| 391 | void gif_destroy_decompress(gif_decompress_struct_pp gif_ptr_ptr) { |
| 392 | if (!gif_ptr_ptr || !*gif_ptr_ptr) |
| 393 | return; |
| 394 | |
| 395 | gif_decompress_struct_p gif_ptr = *gif_ptr_ptr; |
| 396 | *gif_ptr_ptr = nullptr; |
| 397 | FX_Free(gif_ptr->global_pal_ptr); |
| 398 | delete gif_ptr->img_decoder_ptr; |
| 399 | if (gif_ptr->img_ptr_arr_ptr) { |
| 400 | size_t size_img_arr = gif_ptr->img_ptr_arr_ptr->size(); |
| 401 | for (size_t i = 0; i < size_img_arr; i++) { |
| 402 | GifImage* p = (*gif_ptr->img_ptr_arr_ptr)[i]; |
| 403 | FX_Free(p->image_info_ptr); |
| 404 | FX_Free(p->image_gce_ptr); |
| 405 | FX_Free(p->image_row_buf); |
| 406 | if (p->local_pal_ptr && p->local_pal_ptr != gif_ptr->global_pal_ptr) { |
| 407 | FX_Free(p->local_pal_ptr); |
| 408 | } |
| 409 | FX_Free(p); |
| 410 | } |
| 411 | gif_ptr->img_ptr_arr_ptr->clear(); |
| 412 | delete gif_ptr->img_ptr_arr_ptr; |
| 413 | } |
| 414 | delete gif_ptr->cmt_data_ptr; |
| 415 | FX_Free(gif_ptr->gce_ptr); |
| 416 | if (gif_ptr->pt_ptr_arr_ptr) { |
| 417 | size_t size_pt_arr = gif_ptr->pt_ptr_arr_ptr->size(); |
| 418 | for (size_t i = 0; i < size_pt_arr; i++) { |
| 419 | GifPlainText* p = (*gif_ptr->pt_ptr_arr_ptr)[i]; |
| 420 | FX_Free(p->gce_ptr); |
| 421 | FX_Free(p->pte_ptr); |
| 422 | delete p->string_ptr; |
| 423 | FX_Free(p); |
| 424 | } |
| 425 | gif_ptr->pt_ptr_arr_ptr->clear(); |
| 426 | delete gif_ptr->pt_ptr_arr_ptr; |
| 427 | } |
| 428 | FX_Free(gif_ptr); |
| 429 | } |
| 430 | gif_compress_struct_p gif_create_compress() { |
| 431 | gif_compress_struct_p gif_ptr = FX_Alloc(gif_compress_struct, 1); |
| 432 | FXSYS_memset(gif_ptr, 0, sizeof(gif_compress_struct)); |
| 433 | gif_ptr->img_encoder_ptr = new CGifLZWEncoder; |
| 434 | gif_ptr->header_ptr = FX_Alloc(GifHeader, 1); |
| 435 | if (!gif_ptr->header_ptr) { |
| 436 | delete (gif_ptr->img_encoder_ptr); |
| 437 | FX_Free(gif_ptr); |
| 438 | return nullptr; |
| 439 | } |
| 440 | FXSYS_memcpy(gif_ptr->header_ptr->signature, GIF_SIGNATURE, 3); |
| 441 | FXSYS_memcpy(gif_ptr->header_ptr->version, "89a", 3); |
| 442 | gif_ptr->lsd_ptr = FX_Alloc(GifLSD, 1); |
| 443 | if (!gif_ptr->lsd_ptr) { |
| 444 | FX_Free(gif_ptr->header_ptr); |
| 445 | delete (gif_ptr->img_encoder_ptr); |
| 446 | FX_Free(gif_ptr); |
| 447 | return nullptr; |
| 448 | } |
| 449 | FXSYS_memset(gif_ptr->lsd_ptr, 0, sizeof(GifLSD)); |
| 450 | gif_ptr->image_info_ptr = FX_Alloc(GifImageInfo, 1); |
| 451 | if (!gif_ptr->image_info_ptr) { |
| 452 | FX_Free(gif_ptr->lsd_ptr); |
| 453 | FX_Free(gif_ptr->header_ptr); |
| 454 | delete (gif_ptr->img_encoder_ptr); |
| 455 | FX_Free(gif_ptr); |
| 456 | return nullptr; |
| 457 | } |
| 458 | FXSYS_memset(gif_ptr->image_info_ptr, 0, sizeof(GifImageInfo)); |
| 459 | gif_ptr->gce_ptr = FX_Alloc(GifGCE, 1); |
| 460 | if (!gif_ptr->gce_ptr) { |
| 461 | FX_Free(gif_ptr->image_info_ptr); |
| 462 | FX_Free(gif_ptr->lsd_ptr); |
| 463 | FX_Free(gif_ptr->header_ptr); |
| 464 | delete (gif_ptr->img_encoder_ptr); |
| 465 | FX_Free(gif_ptr); |
| 466 | return nullptr; |
| 467 | } |
| 468 | gif_ptr->pte_ptr = FX_Alloc(GifPTE, 1); |
| 469 | if (!gif_ptr->pte_ptr) { |
| 470 | FX_Free(gif_ptr->gce_ptr); |
| 471 | FX_Free(gif_ptr->image_info_ptr); |
| 472 | FX_Free(gif_ptr->lsd_ptr); |
| 473 | FX_Free(gif_ptr->header_ptr); |
| 474 | delete (gif_ptr->img_encoder_ptr); |
| 475 | FX_Free(gif_ptr); |
| 476 | return nullptr; |
| 477 | } |
| 478 | FXSYS_memset(gif_ptr->pte_ptr, 0, sizeof(GifPTE)); |
| 479 | gif_ptr->pte_ptr->block_size = 12; |
| 480 | return gif_ptr; |
| 481 | } |
| 482 | void gif_destroy_compress(gif_compress_struct_pp gif_ptr_ptr) { |
| 483 | if (!gif_ptr_ptr || !*gif_ptr_ptr) |
| 484 | return; |
| 485 | |
| 486 | gif_compress_struct_p gif_ptr = *gif_ptr_ptr; |
| 487 | *gif_ptr_ptr = nullptr; |
| 488 | FX_Free(gif_ptr->header_ptr); |
| 489 | FX_Free(gif_ptr->lsd_ptr); |
| 490 | FX_Free(gif_ptr->global_pal); |
| 491 | FX_Free(gif_ptr->image_info_ptr); |
| 492 | FX_Free(gif_ptr->local_pal); |
| 493 | delete gif_ptr->img_encoder_ptr; |
| 494 | FX_Free(gif_ptr->gce_ptr); |
| 495 | FX_Free(gif_ptr->cmt_data_ptr); |
| 496 | FX_Free(gif_ptr->pte_ptr); |
| 497 | FX_Free(gif_ptr); |
| 498 | } |
| 499 | void gif_error(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg) { |
| 500 | if (gif_ptr && gif_ptr->gif_error_fn) { |
| 501 | gif_ptr->gif_error_fn(gif_ptr, err_msg); |
| 502 | } |
| 503 | } |
| 504 | void gif_warn(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg) {} |
| 505 | int32_t gif_read_header(gif_decompress_struct_p gif_ptr) { |
| 506 | if (!gif_ptr) |
| 507 | return 0; |
| 508 | |
| 509 | uint32_t skip_size_org = gif_ptr->skip_size; |
| 510 | ASSERT(sizeof(GifHeader) == 6); |
| 511 | GifHeader* gif_header_ptr = nullptr; |
| 512 | if (!gif_read_data(gif_ptr, (uint8_t**)&gif_header_ptr, 6)) |
| 513 | return 2; |
| 514 | |
| 515 | if (FXSYS_strncmp(gif_header_ptr->signature, GIF_SIGNATURE, 3) != 0 || |
| 516 | gif_header_ptr->version[0] != '8' || gif_header_ptr->version[2] != 'a') { |
| 517 | gif_error(gif_ptr, "Not A Gif Image"); |
| 518 | return 0; |
| 519 | } |
| 520 | ASSERT(sizeof(GifLSD) == 7); |
| 521 | GifLSD* gif_lsd_ptr = nullptr; |
| 522 | if (!gif_read_data(gif_ptr, (uint8_t**)&gif_lsd_ptr, 7)) { |
| 523 | gif_ptr->skip_size = skip_size_org; |
| 524 | return 2; |
| 525 | } |
| 526 | if (((GifGF*)&gif_lsd_ptr->global_flag)->global_pal) { |
| 527 | gif_ptr->global_pal_num = 2 |
| 528 | << ((GifGF*)&gif_lsd_ptr->global_flag)->pal_bits; |
| 529 | ASSERT(sizeof(GifPalette) == 3); |
| 530 | int32_t global_pal_size = gif_ptr->global_pal_num * 3; |
| 531 | uint8_t* global_pal_ptr = nullptr; |
| 532 | if (!gif_read_data(gif_ptr, &global_pal_ptr, global_pal_size)) { |
| 533 | gif_ptr->skip_size = skip_size_org; |
| 534 | return 2; |
| 535 | } |
| 536 | gif_ptr->global_sort_flag = ((GifGF*)&gif_lsd_ptr->global_flag)->sort_flag; |
| 537 | gif_ptr->global_color_resolution = |
| 538 | ((GifGF*)&gif_lsd_ptr->global_flag)->color_resolution; |
| 539 | FX_Free(gif_ptr->global_pal_ptr); |
| 540 | gif_ptr->global_pal_ptr = (GifPalette*)FX_Alloc(uint8_t, global_pal_size); |
| 541 | FXSYS_memcpy(gif_ptr->global_pal_ptr, global_pal_ptr, global_pal_size); |
| 542 | } |
| 543 | gif_ptr->width = (int)GetWord_LSBFirst((uint8_t*)&gif_lsd_ptr->width); |
| 544 | gif_ptr->height = (int)GetWord_LSBFirst((uint8_t*)&gif_lsd_ptr->height); |
| 545 | gif_ptr->bc_index = gif_lsd_ptr->bc_index; |
| 546 | gif_ptr->pixel_aspect = gif_lsd_ptr->pixel_aspect; |
| 547 | return 1; |
| 548 | } |
| 549 | int32_t gif_get_frame(gif_decompress_struct_p gif_ptr) { |
| 550 | if (!gif_ptr) |
| 551 | return 0; |
| 552 | |
| 553 | int32_t ret = 1; |
| 554 | while (true) { |
| 555 | switch (gif_ptr->decode_status) { |
| 556 | case GIF_D_STATUS_TAIL: |
| 557 | return 1; |
| 558 | case GIF_D_STATUS_SIG: { |
| 559 | uint8_t* sig_ptr = nullptr; |
| 560 | if (!gif_read_data(gif_ptr, &sig_ptr, 1)) |
| 561 | return 2; |
| 562 | |
| 563 | switch (*sig_ptr) { |
| 564 | case GIF_SIG_EXTENSION: |
| 565 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT); |
| 566 | continue; |
| 567 | case GIF_SIG_IMAGE: |
| 568 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_INFO); |
| 569 | continue; |
| 570 | case GIF_SIG_TRAILER: |
| 571 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL); |
| 572 | return 1; |
| 573 | default: |
| 574 | if (gif_ptr->avail_in) { |
| 575 | gif_warn(gif_ptr, "The Gif File has non_standard Tag!"); |
| 576 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG); |
| 577 | continue; |
| 578 | } |
| 579 | gif_warn(gif_ptr, "The Gif File Doesn't have Trailer Tag!"); |
| 580 | return 1; |
| 581 | } |
| 582 | } |
| 583 | case GIF_D_STATUS_EXT: { |
| 584 | uint8_t* ext_ptr = nullptr; |
| 585 | if (!gif_read_data(gif_ptr, &ext_ptr, 1)) |
| 586 | return 2; |
| 587 | |
| 588 | switch (*ext_ptr) { |
| 589 | case GIF_BLOCK_CE: |
| 590 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_CE); |
| 591 | continue; |
| 592 | case GIF_BLOCK_GCE: |
| 593 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_GCE); |
| 594 | continue; |
| 595 | case GIF_BLOCK_PTE: |
| 596 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_PTE); |
| 597 | continue; |
| 598 | default: { |
| 599 | int32_t status = GIF_D_STATUS_EXT_UNE; |
| 600 | if (*ext_ptr == GIF_BLOCK_PTE) { |
| 601 | status = GIF_D_STATUS_EXT_PTE; |
| 602 | } |
| 603 | gif_save_decoding_status(gif_ptr, status); |
| 604 | continue; |
| 605 | } |
| 606 | } |
| 607 | } |
| 608 | case GIF_D_STATUS_IMG_INFO: { |
| 609 | ret = gif_decode_image_info(gif_ptr); |
| 610 | if (ret != 1) { |
| 611 | return ret; |
| 612 | } |
| 613 | continue; |
| 614 | } |
| 615 | case GIF_D_STATUS_IMG_DATA: { |
| 616 | uint8_t* data_size_ptr = nullptr; |
| 617 | uint8_t* data_ptr = nullptr; |
| 618 | uint32_t skip_size_org = gif_ptr->skip_size; |
| 619 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) |
| 620 | return 2; |
| 621 | |
| 622 | while (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 623 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr)) { |
| 624 | gif_ptr->skip_size = skip_size_org; |
| 625 | return 2; |
| 626 | } |
| 627 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA); |
| 628 | skip_size_org = gif_ptr->skip_size; |
| 629 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) |
| 630 | return 2; |
| 631 | } |
| 632 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG); |
| 633 | continue; |
| 634 | } |
| 635 | default: { |
| 636 | ret = gif_decode_extension(gif_ptr); |
| 637 | if (ret != 1) { |
| 638 | return ret; |
| 639 | } |
| 640 | continue; |
| 641 | } |
| 642 | } |
| 643 | } |
| 644 | return 1; |
| 645 | } |
| 646 | void gif_takeover_gce_ptr(gif_decompress_struct_p gif_ptr, |
| 647 | GifGCE** gce_ptr_ptr) { |
| 648 | *gce_ptr_ptr = nullptr; |
| 649 | if (gif_ptr->gce_ptr && gce_ptr_ptr) { |
| 650 | *gce_ptr_ptr = gif_ptr->gce_ptr; |
| 651 | gif_ptr->gce_ptr = nullptr; |
| 652 | } |
| 653 | } |
| 654 | int32_t gif_decode_extension(gif_decompress_struct_p gif_ptr) { |
| 655 | uint8_t* data_size_ptr = nullptr; |
| 656 | uint8_t* data_ptr = nullptr; |
| 657 | uint32_t skip_size_org = gif_ptr->skip_size; |
| 658 | switch (gif_ptr->decode_status) { |
| 659 | case GIF_D_STATUS_EXT_CE: { |
| 660 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) { |
| 661 | gif_ptr->skip_size = skip_size_org; |
| 662 | return 2; |
| 663 | } |
| 664 | gif_ptr->cmt_data_ptr->clear(); |
| 665 | while (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 666 | uint8_t data_size = *data_size_ptr; |
| 667 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) || |
| 668 | !gif_read_data(gif_ptr, &data_size_ptr, 1)) { |
| 669 | gif_ptr->skip_size = skip_size_org; |
| 670 | return 2; |
| 671 | } |
| 672 | *(gif_ptr->cmt_data_ptr) += |
| 673 | CFX_ByteString((const FX_CHAR*)data_ptr, data_size); |
| 674 | } |
| 675 | } break; |
| 676 | case GIF_D_STATUS_EXT_PTE: { |
| 677 | ASSERT(sizeof(GifPTE) == 13); |
| 678 | GifPTE* gif_pte_ptr = nullptr; |
| 679 | if (!gif_read_data(gif_ptr, (uint8_t**)&gif_pte_ptr, 13)) { |
| 680 | return 2; |
| 681 | } |
| 682 | GifPlainText* gif_pt_ptr = FX_Alloc(GifPlainText, 1); |
| 683 | FXSYS_memset(gif_pt_ptr, 0, sizeof(GifPlainText)); |
| 684 | gif_takeover_gce_ptr(gif_ptr, &gif_pt_ptr->gce_ptr); |
| 685 | gif_pt_ptr->pte_ptr = FX_Alloc(GifPTE, 1); |
| 686 | gif_pt_ptr->string_ptr = new CFX_ByteString; |
| 687 | gif_pt_ptr->pte_ptr->block_size = gif_pte_ptr->block_size; |
| 688 | gif_pt_ptr->pte_ptr->grid_left = |
| 689 | GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_left); |
| 690 | gif_pt_ptr->pte_ptr->grid_top = |
| 691 | GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_top); |
| 692 | gif_pt_ptr->pte_ptr->grid_width = |
| 693 | GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_width); |
| 694 | gif_pt_ptr->pte_ptr->grid_height = |
| 695 | GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_height); |
| 696 | gif_pt_ptr->pte_ptr->char_width = gif_pte_ptr->char_width; |
| 697 | gif_pt_ptr->pte_ptr->char_height = gif_pte_ptr->char_height; |
| 698 | gif_pt_ptr->pte_ptr->fc_index = gif_pte_ptr->fc_index; |
| 699 | gif_pt_ptr->pte_ptr->bc_index = gif_pte_ptr->bc_index; |
| 700 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) { |
| 701 | gif_ptr->skip_size = skip_size_org; |
| 702 | if (gif_pt_ptr) { |
| 703 | FX_Free(gif_pt_ptr->gce_ptr); |
| 704 | FX_Free(gif_pt_ptr->pte_ptr); |
| 705 | delete gif_pt_ptr->string_ptr; |
| 706 | FX_Free(gif_pt_ptr); |
| 707 | } |
| 708 | return 2; |
| 709 | } |
| 710 | while (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 711 | uint8_t data_size = *data_size_ptr; |
| 712 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) || |
| 713 | !gif_read_data(gif_ptr, &data_size_ptr, 1)) { |
| 714 | gif_ptr->skip_size = skip_size_org; |
| 715 | if (gif_pt_ptr) { |
| 716 | FX_Free(gif_pt_ptr->gce_ptr); |
| 717 | FX_Free(gif_pt_ptr->pte_ptr); |
| 718 | delete gif_pt_ptr->string_ptr; |
| 719 | FX_Free(gif_pt_ptr); |
| 720 | } |
| 721 | return 2; |
| 722 | } |
| 723 | *(gif_pt_ptr->string_ptr) += |
| 724 | CFX_ByteString((const FX_CHAR*)data_ptr, data_size); |
| 725 | } |
| 726 | gif_ptr->pt_ptr_arr_ptr->push_back(gif_pt_ptr); |
| 727 | } break; |
| 728 | case GIF_D_STATUS_EXT_GCE: { |
| 729 | ASSERT(sizeof(GifGCE) == 5); |
| 730 | GifGCE* gif_gce_ptr = nullptr; |
| 731 | if (!gif_read_data(gif_ptr, (uint8_t**)&gif_gce_ptr, 6)) |
| 732 | return 2; |
| 733 | |
| 734 | if (!gif_ptr->gce_ptr) |
| 735 | gif_ptr->gce_ptr = FX_Alloc(GifGCE, 1); |
| 736 | gif_ptr->gce_ptr->block_size = gif_gce_ptr->block_size; |
| 737 | gif_ptr->gce_ptr->gce_flag = gif_gce_ptr->gce_flag; |
| 738 | gif_ptr->gce_ptr->delay_time = |
| 739 | GetWord_LSBFirst((uint8_t*)&gif_gce_ptr->delay_time); |
| 740 | gif_ptr->gce_ptr->trans_index = gif_gce_ptr->trans_index; |
| 741 | } break; |
| 742 | default: { |
| 743 | if (gif_ptr->decode_status == GIF_D_STATUS_EXT_PTE) { |
| 744 | FX_Free(gif_ptr->gce_ptr); |
| 745 | gif_ptr->gce_ptr = nullptr; |
| 746 | } |
| 747 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) |
| 748 | return 2; |
| 749 | |
| 750 | while (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 751 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) || |
| 752 | !gif_read_data(gif_ptr, &data_size_ptr, 1)) { |
| 753 | gif_ptr->skip_size = skip_size_org; |
| 754 | return 2; |
| 755 | } |
| 756 | } |
| 757 | } |
| 758 | } |
| 759 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG); |
| 760 | return 1; |
| 761 | } |
| 762 | int32_t gif_decode_image_info(gif_decompress_struct_p gif_ptr) { |
| 763 | if (gif_ptr->width == 0 || gif_ptr->height == 0) { |
| 764 | gif_error(gif_ptr, "No Image Header Info"); |
| 765 | return 0; |
| 766 | } |
| 767 | uint32_t skip_size_org = gif_ptr->skip_size; |
| 768 | ASSERT(sizeof(GifImageInfo) == 9); |
| 769 | GifImageInfo* gif_img_info_ptr = nullptr; |
| 770 | if (!gif_read_data(gif_ptr, (uint8_t**)&gif_img_info_ptr, 9)) |
| 771 | return 2; |
| 772 | |
| 773 | GifImage* gif_image_ptr = FX_Alloc(GifImage, 1); |
| 774 | FXSYS_memset(gif_image_ptr, 0, sizeof(GifImage)); |
| 775 | gif_image_ptr->image_info_ptr = FX_Alloc(GifImageInfo, 1); |
| 776 | gif_image_ptr->image_info_ptr->left = |
| 777 | GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->left); |
| 778 | gif_image_ptr->image_info_ptr->top = |
| 779 | GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->top); |
| 780 | gif_image_ptr->image_info_ptr->width = |
| 781 | GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->width); |
| 782 | gif_image_ptr->image_info_ptr->height = |
| 783 | GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->height); |
| 784 | gif_image_ptr->image_info_ptr->local_flag = gif_img_info_ptr->local_flag; |
| 785 | if (gif_image_ptr->image_info_ptr->left + |
| 786 | gif_image_ptr->image_info_ptr->width > |
| 787 | gif_ptr->width || |
| 788 | gif_image_ptr->image_info_ptr->top + |
| 789 | gif_image_ptr->image_info_ptr->height > |
| 790 | gif_ptr->height) { |
| 791 | FX_Free(gif_image_ptr->image_info_ptr); |
| 792 | FX_Free(gif_image_ptr->image_row_buf); |
| 793 | FX_Free(gif_image_ptr); |
| 794 | gif_error(gif_ptr, "Image Data Out Of LSD, The File May Be Corrupt"); |
| 795 | return 0; |
| 796 | } |
| 797 | GifLF* gif_img_info_lf_ptr = (GifLF*)&gif_img_info_ptr->local_flag; |
| 798 | if (gif_img_info_lf_ptr->local_pal) { |
| 799 | ASSERT(sizeof(GifPalette) == 3); |
| 800 | int32_t loc_pal_size = (2 << gif_img_info_lf_ptr->pal_bits) * 3; |
| 801 | uint8_t* loc_pal_ptr = nullptr; |
| 802 | if (!gif_read_data(gif_ptr, &loc_pal_ptr, loc_pal_size)) { |
| 803 | gif_ptr->skip_size = skip_size_org; |
| 804 | FX_Free(gif_image_ptr->image_info_ptr); |
| 805 | FX_Free(gif_image_ptr->image_row_buf); |
| 806 | FX_Free(gif_image_ptr); |
| 807 | return 2; |
| 808 | } |
| 809 | gif_image_ptr->local_pal_ptr = |
| 810 | (GifPalette*)gif_ptr->gif_ask_buf_for_pal_fn(gif_ptr, loc_pal_size); |
| 811 | if (gif_image_ptr->local_pal_ptr) { |
| 812 | FXSYS_memcpy((uint8_t*)gif_image_ptr->local_pal_ptr, loc_pal_ptr, |
| 813 | loc_pal_size); |
| 814 | } |
| 815 | } |
| 816 | uint8_t* code_size_ptr = nullptr; |
| 817 | if (!gif_read_data(gif_ptr, &code_size_ptr, 1)) { |
| 818 | gif_ptr->skip_size = skip_size_org; |
| 819 | FX_Free(gif_image_ptr->image_info_ptr); |
| 820 | FX_Free(gif_image_ptr->local_pal_ptr); |
| 821 | FX_Free(gif_image_ptr->image_row_buf); |
| 822 | FX_Free(gif_image_ptr); |
| 823 | return 2; |
| 824 | } |
| 825 | gif_image_ptr->image_code_size = *code_size_ptr; |
| 826 | gif_ptr->gif_record_current_position_fn(gif_ptr, |
| 827 | &gif_image_ptr->image_data_pos); |
| 828 | gif_image_ptr->image_data_pos += gif_ptr->skip_size; |
| 829 | gif_takeover_gce_ptr(gif_ptr, &gif_image_ptr->image_gce_ptr); |
| 830 | gif_ptr->img_ptr_arr_ptr->push_back(gif_image_ptr); |
| 831 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA); |
| 832 | return 1; |
| 833 | } |
| 834 | int32_t gif_load_frame(gif_decompress_struct_p gif_ptr, int32_t frame_num) { |
| 835 | if (!gif_ptr || frame_num < 0 || |
| 836 | frame_num >= pdfium::CollectionSize<int>(*gif_ptr->img_ptr_arr_ptr)) { |
| 837 | return 0; |
| 838 | } |
| 839 | uint8_t* data_size_ptr = nullptr; |
| 840 | uint8_t* data_ptr = nullptr; |
| 841 | uint32_t skip_size_org = gif_ptr->skip_size; |
| 842 | GifImage* gif_image_ptr = (*gif_ptr->img_ptr_arr_ptr)[frame_num]; |
| 843 | uint32_t gif_img_row_bytes = gif_image_ptr->image_info_ptr->width; |
| 844 | if (gif_img_row_bytes == 0) { |
| 845 | gif_error(gif_ptr, "Error Invalid Number of Row Bytes"); |
| 846 | return 0; |
| 847 | } |
| 848 | if (gif_ptr->decode_status == GIF_D_STATUS_TAIL) { |
| 849 | if (gif_image_ptr->image_row_buf) { |
| 850 | FX_Free(gif_image_ptr->image_row_buf); |
| 851 | gif_image_ptr->image_row_buf = nullptr; |
| 852 | } |
| 853 | gif_image_ptr->image_row_buf = FX_Alloc(uint8_t, gif_img_row_bytes); |
| 854 | GifGCE* gif_img_gce_ptr = gif_image_ptr->image_gce_ptr; |
| 855 | int32_t loc_pal_num = |
| 856 | ((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)->local_pal |
| 857 | ? (2 << ((GifLF*)&gif_image_ptr->image_info_ptr->local_flag) |
| 858 | ->pal_bits) |
| 859 | : 0; |
| 860 | gif_ptr->avail_in = 0; |
| 861 | if (!gif_img_gce_ptr) { |
| 862 | bool bRes = gif_ptr->gif_get_record_position_fn( |
| 863 | gif_ptr, gif_image_ptr->image_data_pos, |
| 864 | gif_image_ptr->image_info_ptr->left, |
| 865 | gif_image_ptr->image_info_ptr->top, |
| 866 | gif_image_ptr->image_info_ptr->width, |
| 867 | gif_image_ptr->image_info_ptr->height, loc_pal_num, |
| 868 | gif_image_ptr->local_pal_ptr, 0, 0, -1, 0, |
| 869 | (bool)((GifLF*)&gif_image_ptr->image_info_ptr->local_flag) |
| 870 | ->interlace); |
| 871 | if (!bRes) { |
| 872 | FX_Free(gif_image_ptr->image_row_buf); |
| 873 | gif_image_ptr->image_row_buf = nullptr; |
| 874 | gif_error(gif_ptr, "Error Read Record Position Data"); |
| 875 | return 0; |
| 876 | } |
| 877 | } else { |
| 878 | bool bRes = gif_ptr->gif_get_record_position_fn( |
| 879 | gif_ptr, gif_image_ptr->image_data_pos, |
| 880 | gif_image_ptr->image_info_ptr->left, |
| 881 | gif_image_ptr->image_info_ptr->top, |
| 882 | gif_image_ptr->image_info_ptr->width, |
| 883 | gif_image_ptr->image_info_ptr->height, loc_pal_num, |
| 884 | gif_image_ptr->local_pal_ptr, |
| 885 | (int32_t)gif_image_ptr->image_gce_ptr->delay_time, |
| 886 | (bool)((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag)->user_input, |
| 887 | ((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag)->transparency |
| 888 | ? (int32_t)gif_image_ptr->image_gce_ptr->trans_index |
| 889 | : -1, |
| 890 | (int32_t)((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag) |
| 891 | ->disposal_method, |
| 892 | (bool)((GifLF*)&gif_image_ptr->image_info_ptr->local_flag) |
| 893 | ->interlace); |
| 894 | if (!bRes) { |
| 895 | FX_Free(gif_image_ptr->image_row_buf); |
| 896 | gif_image_ptr->image_row_buf = nullptr; |
| 897 | gif_error(gif_ptr, "Error Read Record Position Data"); |
| 898 | return 0; |
| 899 | } |
| 900 | } |
| 901 | if (gif_image_ptr->image_code_size >= 32) { |
| 902 | FX_Free(gif_image_ptr->image_row_buf); |
| 903 | gif_image_ptr->image_row_buf = nullptr; |
| 904 | gif_error(gif_ptr, "Error Invalid Code Size"); |
| 905 | return 0; |
| 906 | } |
| 907 | if (!gif_ptr->img_decoder_ptr) |
| 908 | gif_ptr->img_decoder_ptr = new CGifLZWDecoder(gif_ptr->err_ptr); |
| 909 | gif_ptr->img_decoder_ptr->InitTable(gif_image_ptr->image_code_size); |
| 910 | gif_ptr->img_row_offset = 0; |
| 911 | gif_ptr->img_row_avail_size = 0; |
| 912 | gif_ptr->img_pass_num = 0; |
| 913 | gif_image_ptr->image_row_num = 0; |
| 914 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA); |
| 915 | } |
| 916 | CGifLZWDecoder* img_decoder_ptr = gif_ptr->img_decoder_ptr; |
| 917 | if (gif_ptr->decode_status == GIF_D_STATUS_IMG_DATA) { |
| 918 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) |
| 919 | return 2; |
| 920 | |
| 921 | if (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 922 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr)) { |
| 923 | gif_ptr->skip_size = skip_size_org; |
| 924 | return 2; |
| 925 | } |
| 926 | img_decoder_ptr->Input(data_ptr, *data_size_ptr); |
| 927 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA); |
| 928 | gif_ptr->img_row_offset += gif_ptr->img_row_avail_size; |
| 929 | gif_ptr->img_row_avail_size = gif_img_row_bytes - gif_ptr->img_row_offset; |
| 930 | int32_t ret = img_decoder_ptr->Decode( |
| 931 | gif_image_ptr->image_row_buf + gif_ptr->img_row_offset, |
| 932 | gif_ptr->img_row_avail_size); |
| 933 | if (ret == 0) { |
| 934 | gif_decoding_failure_at_tail_cleanup(gif_ptr, gif_image_ptr); |
| 935 | return 0; |
| 936 | } |
| 937 | while (ret != 0) { |
| 938 | if (ret == 1) { |
| 939 | gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num, |
| 940 | gif_image_ptr->image_row_buf); |
| 941 | FX_Free(gif_image_ptr->image_row_buf); |
| 942 | gif_image_ptr->image_row_buf = nullptr; |
| 943 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL); |
| 944 | return 1; |
| 945 | } |
| 946 | if (ret == 2) { |
| 947 | ASSERT(img_decoder_ptr->GetAvailInput() == 0); |
| 948 | skip_size_org = gif_ptr->skip_size; |
| 949 | if (!gif_read_data(gif_ptr, &data_size_ptr, 1)) |
| 950 | return 2; |
| 951 | |
| 952 | if (*data_size_ptr != GIF_BLOCK_TERMINAL) { |
| 953 | if (!gif_read_data(gif_ptr, &data_ptr, *data_size_ptr)) { |
| 954 | gif_ptr->skip_size = skip_size_org; |
| 955 | return 2; |
| 956 | } |
| 957 | img_decoder_ptr->Input(data_ptr, *data_size_ptr); |
| 958 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA); |
| 959 | gif_ptr->img_row_offset += gif_ptr->img_row_avail_size; |
| 960 | gif_ptr->img_row_avail_size = |
| 961 | gif_img_row_bytes - gif_ptr->img_row_offset; |
| 962 | ret = img_decoder_ptr->Decode( |
| 963 | gif_image_ptr->image_row_buf + gif_ptr->img_row_offset, |
| 964 | gif_ptr->img_row_avail_size); |
| 965 | } |
| 966 | } |
| 967 | if (ret == 3) { |
| 968 | if (((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)->interlace) { |
| 969 | gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num, |
| 970 | gif_image_ptr->image_row_buf); |
| 971 | gif_image_ptr->image_row_num += |
| 972 | s_gif_interlace_step[gif_ptr->img_pass_num]; |
| 973 | if (gif_image_ptr->image_row_num >= |
| 974 | (int32_t)gif_image_ptr->image_info_ptr->height) { |
| 975 | gif_ptr->img_pass_num++; |
| 976 | if (gif_ptr->img_pass_num == FX_ArraySize(s_gif_interlace_step)) { |
| 977 | gif_decoding_failure_at_tail_cleanup(gif_ptr, gif_image_ptr); |
| 978 | return 0; |
| 979 | } |
| 980 | gif_image_ptr->image_row_num = |
| 981 | s_gif_interlace_step[gif_ptr->img_pass_num] / 2; |
| 982 | } |
| 983 | } else { |
| 984 | gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num++, |
| 985 | gif_image_ptr->image_row_buf); |
| 986 | } |
| 987 | gif_ptr->img_row_offset = 0; |
| 988 | gif_ptr->img_row_avail_size = gif_img_row_bytes; |
| 989 | ret = img_decoder_ptr->Decode( |
| 990 | gif_image_ptr->image_row_buf + gif_ptr->img_row_offset, |
| 991 | gif_ptr->img_row_avail_size); |
| 992 | } |
| 993 | if (ret == 0) { |
| 994 | gif_decoding_failure_at_tail_cleanup(gif_ptr, gif_image_ptr); |
| 995 | return 0; |
| 996 | } |
| 997 | } |
| 998 | } |
| 999 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL); |
| 1000 | } |
| 1001 | gif_error(gif_ptr, "Decode Image Data Error"); |
| 1002 | return 0; |
| 1003 | } |
| 1004 | void gif_decoding_failure_at_tail_cleanup(gif_decompress_struct_p gif_ptr, |
| 1005 | GifImage* gif_image_ptr) { |
| 1006 | FX_Free(gif_image_ptr->image_row_buf); |
| 1007 | gif_image_ptr->image_row_buf = nullptr; |
| 1008 | gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL); |
| 1009 | gif_error(gif_ptr, "Decode Image Data Error"); |
| 1010 | } |
| 1011 | void gif_save_decoding_status(gif_decompress_struct_p gif_ptr, int32_t status) { |
| 1012 | gif_ptr->decode_status = status; |
| 1013 | gif_ptr->next_in += gif_ptr->skip_size; |
| 1014 | gif_ptr->avail_in -= gif_ptr->skip_size; |
| 1015 | gif_ptr->skip_size = 0; |
| 1016 | } |
| 1017 | uint8_t* gif_read_data(gif_decompress_struct_p gif_ptr, |
| 1018 | uint8_t** des_buf_pp, |
| 1019 | uint32_t data_size) { |
| 1020 | if (!gif_ptr || gif_ptr->avail_in < gif_ptr->skip_size + data_size) |
| 1021 | return nullptr; |
| 1022 | |
| 1023 | *des_buf_pp = gif_ptr->next_in + gif_ptr->skip_size; |
| 1024 | gif_ptr->skip_size += data_size; |
| 1025 | return *des_buf_pp; |
| 1026 | } |
| 1027 | void gif_input_buffer(gif_decompress_struct_p gif_ptr, |
| 1028 | uint8_t* src_buf, |
| 1029 | uint32_t src_size) { |
| 1030 | gif_ptr->next_in = src_buf; |
| 1031 | gif_ptr->avail_in = src_size; |
| 1032 | gif_ptr->skip_size = 0; |
| 1033 | } |
| 1034 | uint32_t gif_get_avail_input(gif_decompress_struct_p gif_ptr, |
| 1035 | uint8_t** avail_buf_ptr) { |
| 1036 | if (avail_buf_ptr) { |
| 1037 | *avail_buf_ptr = nullptr; |
| 1038 | if (gif_ptr->avail_in > 0) { |
| 1039 | *avail_buf_ptr = gif_ptr->next_in; |
| 1040 | } |
| 1041 | } |
| 1042 | return gif_ptr->avail_in; |
| 1043 | } |
| 1044 | int32_t gif_get_frame_num(gif_decompress_struct_p gif_ptr) { |
| 1045 | return pdfium::CollectionSize<int32_t>(*gif_ptr->img_ptr_arr_ptr); |
| 1046 | } |
| 1047 | static bool gif_write_header(gif_compress_struct_p gif_ptr, |
| 1048 | uint8_t*& dst_buf, |
| 1049 | uint32_t& dst_len) { |
| 1050 | if (gif_ptr->cur_offset) { |
| 1051 | return true; |
| 1052 | } |
| 1053 | dst_len = sizeof(GifHeader) + sizeof(GifLSD) + sizeof(GifGF); |
| 1054 | dst_buf = FX_TryAlloc(uint8_t, dst_len); |
| 1055 | if (!dst_buf) |
| 1056 | return false; |
| 1057 | |
| 1058 | FXSYS_memset(dst_buf, 0, dst_len); |
| 1059 | FXSYS_memcpy(dst_buf, gif_ptr->header_ptr, sizeof(GifHeader)); |
| 1060 | gif_ptr->cur_offset += sizeof(GifHeader); |
| 1061 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->lsd_ptr->width); |
| 1062 | gif_ptr->cur_offset += 2; |
| 1063 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->lsd_ptr->height); |
| 1064 | gif_ptr->cur_offset += 2; |
| 1065 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->global_flag; |
| 1066 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->bc_index; |
| 1067 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->pixel_aspect; |
| 1068 | if (gif_ptr->global_pal) { |
| 1069 | uint16_t size = sizeof(GifPalette) * gif_ptr->gpal_num; |
| 1070 | if (!gif_grow_buf(dst_buf, dst_len, gif_ptr->cur_offset + size)) { |
| 1071 | return false; |
| 1072 | } |
| 1073 | FXSYS_memcpy(&dst_buf[gif_ptr->cur_offset], gif_ptr->global_pal, size); |
| 1074 | gif_ptr->cur_offset += size; |
| 1075 | } |
| 1076 | return true; |
| 1077 | } |
| 1078 | void interlace_buf(const uint8_t* buf, uint32_t pitch, uint32_t height) { |
| 1079 | std::vector<uint8_t*> pass[4]; |
| 1080 | uint32_t row = 0; |
| 1081 | uint8_t* temp; |
| 1082 | while (row < height) { |
| 1083 | size_t j; |
| 1084 | if (row % 8 == 0) { |
| 1085 | j = 0; |
| 1086 | } else if (row % 4 == 0) { |
| 1087 | j = 1; |
| 1088 | } else if (row % 2 == 0) { |
| 1089 | j = 2; |
| 1090 | } else { |
| 1091 | j = 3; |
| 1092 | } |
| 1093 | temp = FX_Alloc(uint8_t, pitch); |
| 1094 | FXSYS_memcpy(temp, &buf[pitch * row], pitch); |
| 1095 | pass[j].push_back(temp); |
| 1096 | row++; |
| 1097 | } |
| 1098 | for (size_t i = 0, row = 0; i < 4; i++) { |
| 1099 | for (size_t j = 0; j < pass[i].size(); j++, row++) { |
| 1100 | FXSYS_memcpy((uint8_t*)&buf[pitch * row], pass[i][j], pitch); |
| 1101 | FX_Free(pass[i][j]); |
| 1102 | } |
| 1103 | } |
| 1104 | } |
| 1105 | static void gif_write_block_data(const uint8_t* src_buf, |
| 1106 | uint32_t src_len, |
| 1107 | uint8_t*& dst_buf, |
| 1108 | uint32_t& dst_len, |
| 1109 | uint32_t& dst_offset) { |
| 1110 | uint32_t src_offset = 0; |
| 1111 | while (src_len > GIF_DATA_BLOCK) { |
| 1112 | dst_buf[dst_offset++] = GIF_DATA_BLOCK; |
| 1113 | FXSYS_memcpy(&dst_buf[dst_offset], &src_buf[src_offset], GIF_DATA_BLOCK); |
| 1114 | dst_offset += GIF_DATA_BLOCK; |
| 1115 | src_offset += GIF_DATA_BLOCK; |
| 1116 | src_len -= GIF_DATA_BLOCK; |
| 1117 | } |
| 1118 | dst_buf[dst_offset++] = (uint8_t)src_len; |
| 1119 | FXSYS_memcpy(&dst_buf[dst_offset], &src_buf[src_offset], src_len); |
| 1120 | dst_offset += src_len; |
| 1121 | } |
| 1122 | static bool gif_write_data(gif_compress_struct_p gif_ptr, |
| 1123 | uint8_t*& dst_buf, |
| 1124 | uint32_t& dst_len) { |
| 1125 | if (!gif_grow_buf(dst_buf, dst_len, gif_ptr->cur_offset + GIF_DATA_BLOCK)) { |
| 1126 | return false; |
| 1127 | } |
| 1128 | if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0) { |
| 1129 | dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION; |
| 1130 | dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_GCE; |
| 1131 | gif_ptr->gce_ptr->block_size = 4; |
| 1132 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->block_size; |
| 1133 | gif_ptr->gce_ptr->gce_flag = 0; |
| 1134 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->gce_flag; |
| 1135 | gif_ptr->gce_ptr->delay_time = 10; |
| 1136 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1137 | gif_ptr->gce_ptr->delay_time); |
| 1138 | gif_ptr->cur_offset += 2; |
| 1139 | gif_ptr->gce_ptr->trans_index = 0; |
| 1140 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->trans_index; |
| 1141 | dst_buf[gif_ptr->cur_offset++] = 0; |
| 1142 | } |
| 1143 | dst_buf[gif_ptr->cur_offset++] = GIF_SIG_IMAGE; |
| 1144 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1145 | gif_ptr->image_info_ptr->left); |
| 1146 | gif_ptr->cur_offset += 2; |
| 1147 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->image_info_ptr->top); |
| 1148 | gif_ptr->cur_offset += 2; |
| 1149 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1150 | gif_ptr->image_info_ptr->width); |
| 1151 | gif_ptr->cur_offset += 2; |
| 1152 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1153 | gif_ptr->image_info_ptr->height); |
| 1154 | gif_ptr->cur_offset += 2; |
| 1155 | GifLF& lf = (GifLF&)gif_ptr->image_info_ptr->local_flag; |
| 1156 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->image_info_ptr->local_flag; |
| 1157 | if (gif_ptr->local_pal) { |
| 1158 | uint32_t pal_size = sizeof(GifPalette) * gif_ptr->lpal_num; |
| 1159 | if (!gif_grow_buf(dst_buf, dst_len, pal_size + gif_ptr->cur_offset)) { |
| 1160 | return false; |
| 1161 | } |
| 1162 | FXSYS_memcpy(&dst_buf[gif_ptr->cur_offset], gif_ptr->local_pal, pal_size); |
| 1163 | gif_ptr->cur_offset += pal_size; |
| 1164 | } |
| 1165 | if (lf.interlace) { |
| 1166 | interlace_buf(gif_ptr->src_buf, gif_ptr->src_pitch, |
| 1167 | gif_ptr->image_info_ptr->height); |
| 1168 | } |
| 1169 | uint8_t code_bit = lf.pal_bits; |
| 1170 | if (lf.local_pal == 0) { |
| 1171 | GifGF& gf = (GifGF&)gif_ptr->lsd_ptr->global_flag; |
| 1172 | code_bit = gf.pal_bits; |
| 1173 | } |
| 1174 | if (code_bit >= 31) |
| 1175 | return false; |
| 1176 | gif_ptr->img_encoder_ptr->Start(code_bit, gif_ptr->src_buf, dst_buf, |
| 1177 | gif_ptr->cur_offset); |
| 1178 | uint32_t i; |
| 1179 | for (i = 0; i < gif_ptr->src_row; i++) { |
| 1180 | if (!gif_ptr->img_encoder_ptr->Encode( |
| 1181 | &gif_ptr->src_buf[i * gif_ptr->src_pitch], |
| 1182 | gif_ptr->src_width * (code_bit + 1), dst_buf, dst_len, |
| 1183 | gif_ptr->cur_offset)) { |
| 1184 | return false; |
| 1185 | } |
| 1186 | } |
| 1187 | gif_ptr->img_encoder_ptr->Finish(dst_buf, dst_len, gif_ptr->cur_offset); |
| 1188 | dst_buf[gif_ptr->cur_offset++] = 0; |
| 1189 | if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0 && |
| 1190 | gif_ptr->cmt_data_ptr) { |
| 1191 | dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION; |
| 1192 | dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_CE; |
| 1193 | gif_write_block_data(gif_ptr->cmt_data_ptr, gif_ptr->cmt_data_len, dst_buf, |
| 1194 | dst_len, gif_ptr->cur_offset); |
| 1195 | dst_buf[gif_ptr->cur_offset++] = 0; |
| 1196 | } |
| 1197 | if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0 && |
| 1198 | gif_ptr->pte_data_ptr) { |
| 1199 | dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION; |
| 1200 | dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_PTE; |
| 1201 | dst_buf[gif_ptr->cur_offset++] = gif_ptr->pte_ptr->block_size; |
| 1202 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1203 | gif_ptr->pte_ptr->grid_left); |
| 1204 | gif_ptr->cur_offset += 2; |
| 1205 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->grid_top); |
| 1206 | gif_ptr->cur_offset += 2; |
| 1207 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1208 | gif_ptr->pte_ptr->grid_width); |
| 1209 | gif_ptr->cur_offset += 2; |
| 1210 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1211 | gif_ptr->pte_ptr->grid_height); |
| 1212 | gif_ptr->cur_offset += 2; |
| 1213 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1214 | gif_ptr->pte_ptr->char_width); |
| 1215 | gif_ptr->cur_offset += 2; |
| 1216 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, |
| 1217 | gif_ptr->pte_ptr->char_height); |
| 1218 | gif_ptr->cur_offset += 2; |
| 1219 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->fc_index); |
| 1220 | gif_ptr->cur_offset += 2; |
| 1221 | SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->bc_index); |
| 1222 | gif_ptr->cur_offset += 2; |
| 1223 | gif_write_block_data(gif_ptr->pte_data_ptr, gif_ptr->pte_data_len, dst_buf, |
| 1224 | dst_len, gif_ptr->cur_offset); |
| 1225 | gif_ptr->cur_offset += gif_ptr->pte_data_len; |
| 1226 | dst_buf[gif_ptr->cur_offset++] = 0; |
| 1227 | } |
| 1228 | dst_buf[gif_ptr->cur_offset++] = GIF_SIG_TRAILER; |
| 1229 | return true; |
| 1230 | } |
| 1231 | bool gif_encode(gif_compress_struct_p gif_ptr, |
| 1232 | uint8_t*& dst_buf, |
| 1233 | uint32_t& dst_len) { |
| 1234 | if (!gif_write_header(gif_ptr, dst_buf, dst_len)) { |
| 1235 | return false; |
| 1236 | } |
| 1237 | uint32_t cur_offset = gif_ptr->cur_offset; |
| 1238 | bool res = true; |
| 1239 | if (gif_ptr->frames) { |
| 1240 | gif_ptr->cur_offset--; |
| 1241 | } |
| 1242 | if (!gif_write_data(gif_ptr, dst_buf, dst_len)) { |
| 1243 | gif_ptr->cur_offset = cur_offset; |
| 1244 | res = false; |
| 1245 | } |
| 1246 | dst_len = gif_ptr->cur_offset; |
| 1247 | dst_buf[dst_len - 1] = GIF_SIG_TRAILER; |
| 1248 | if (res) { |
| 1249 | gif_ptr->frames++; |
| 1250 | } |
| 1251 | return res; |
| 1252 | } |