| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "core/fxcodec/codec/codec_int.h" |
| #include "core/include/fxcodec/fx_codec.h" |
| |
| namespace { |
| |
| const uint8_t OneLeadPos[256] = { |
| 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, |
| 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| }; |
| const uint8_t ZeroLeadPos[256] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
| 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, |
| }; |
| |
| int FindBit(const uint8_t* data_buf, int max_pos, int start_pos, int bit) { |
| if (start_pos >= max_pos) { |
| return max_pos; |
| } |
| const uint8_t* leading_pos = bit ? OneLeadPos : ZeroLeadPos; |
| if (start_pos % 8) { |
| uint8_t data = data_buf[start_pos / 8]; |
| if (bit) { |
| data &= 0xff >> (start_pos % 8); |
| } else { |
| data |= 0xff << (8 - start_pos % 8); |
| } |
| if (leading_pos[data] < 8) { |
| return start_pos / 8 * 8 + leading_pos[data]; |
| } |
| start_pos += 7; |
| } |
| uint8_t skip = bit ? 0x00 : 0xff; |
| int byte_pos = start_pos / 8; |
| int max_byte = (max_pos + 7) / 8; |
| while (byte_pos < max_byte) { |
| if (data_buf[byte_pos] != skip) { |
| break; |
| } |
| byte_pos++; |
| } |
| if (byte_pos == max_byte) { |
| return max_pos; |
| } |
| int pos = leading_pos[data_buf[byte_pos]] + byte_pos * 8; |
| if (pos > max_pos) { |
| pos = max_pos; |
| } |
| return pos; |
| } |
| |
| void FaxG4FindB1B2(const uint8_t* ref_buf, |
| int columns, |
| int a0, |
| bool a0color, |
| int& b1, |
| int& b2) { |
| uint8_t first_bit = |
| (a0 < 0) ? 1 : ((ref_buf[a0 / 8] & (1 << (7 - a0 % 8))) != 0); |
| b1 = FindBit(ref_buf, columns, a0 + 1, !first_bit); |
| if (b1 >= columns) { |
| b1 = b2 = columns; |
| return; |
| } |
| if (first_bit == !a0color) { |
| b1 = FindBit(ref_buf, columns, b1 + 1, first_bit); |
| first_bit = !first_bit; |
| } |
| if (b1 >= columns) { |
| b1 = b2 = columns; |
| return; |
| } |
| b2 = FindBit(ref_buf, columns, b1 + 1, first_bit); |
| } |
| |
| void FaxFillBits(uint8_t* dest_buf, int columns, int startpos, int endpos) { |
| if (startpos < 0) { |
| startpos = 0; |
| } |
| if (endpos < 0) { |
| endpos = 0; |
| } |
| if (endpos >= columns) { |
| endpos = columns; |
| } |
| if (startpos >= endpos) { |
| return; |
| } |
| int first_byte = startpos / 8; |
| int last_byte = (endpos - 1) / 8; |
| if (first_byte == last_byte) { |
| for (int i = startpos % 8; i <= (endpos - 1) % 8; i++) { |
| dest_buf[first_byte] -= 1 << (7 - i); |
| } |
| return; |
| } |
| int i; |
| for (i = startpos % 8; i < 8; i++) { |
| dest_buf[first_byte] -= 1 << (7 - i); |
| } |
| for (i = 0; i <= (endpos - 1) % 8; i++) { |
| dest_buf[last_byte] -= 1 << (7 - i); |
| } |
| if (last_byte > first_byte + 1) { |
| FXSYS_memset(dest_buf + first_byte + 1, 0, last_byte - first_byte - 1); |
| } |
| } |
| |
| #define NEXTBIT \ |
| src_buf[bitpos / 8] & (1 << (7 - bitpos % 8)); \ |
| bitpos++; |
| #define ADDBIT(code, bit) \ |
| code = code << 1; \ |
| if (bit) \ |
| code++; |
| #define GETBIT(bitpos) src_buf[bitpos / 8] & (1 << (7 - bitpos % 8)) |
| |
| const uint8_t FaxBlackRunIns[] = { |
| 0, 2, 0x02, 3, 0, 0x03, |
| 2, 0, 2, 0x02, 1, 0, |
| 0x03, 4, 0, 2, 0x02, 6, |
| 0, 0x03, 5, 0, 1, 0x03, |
| 7, 0, 2, 0x04, 9, 0, |
| 0x05, 8, 0, 3, 0x04, 10, |
| 0, 0x05, 11, 0, 0x07, 12, |
| 0, 2, 0x04, 13, 0, 0x07, |
| 14, 0, 1, 0x18, 15, 0, |
| 5, 0x08, 18, 0, 0x0f, 64, |
| 0, 0x17, 16, 0, 0x18, 17, |
| 0, 0x37, 0, 0, 10, 0x08, |
| 0x00, 0x07, 0x0c, 0x40, 0x07, 0x0d, |
| 0x80, 0x07, 0x17, 24, 0, 0x18, |
| 25, 0, 0x28, 23, 0, 0x37, |
| 22, 0, 0x67, 19, 0, 0x68, |
| 20, 0, 0x6c, 21, 0, 54, |
| 0x12, 1984 % 256, 1984 / 256, 0x13, 2048 % 256, 2048 / 256, |
| 0x14, 2112 % 256, 2112 / 256, 0x15, 2176 % 256, 2176 / 256, |
| 0x16, 2240 % 256, 2240 / 256, 0x17, 2304 % 256, 2304 / 256, |
| 0x1c, 2368 % 256, 2368 / 256, 0x1d, 2432 % 256, 2432 / 256, |
| 0x1e, 2496 % 256, 2496 / 256, 0x1f, 2560 % 256, 2560 / 256, |
| 0x24, 52, 0, 0x27, 55, 0, |
| 0x28, 56, 0, 0x2b, 59, 0, |
| 0x2c, 60, 0, 0x33, 320 % 256, 320 / 256, |
| 0x34, 384 % 256, 384 / 256, 0x35, 448 % 256, 448 / 256, |
| 0x37, 53, 0, 0x38, 54, 0, |
| 0x52, 50, 0, 0x53, 51, 0, |
| 0x54, 44, 0, 0x55, 45, 0, |
| 0x56, 46, 0, 0x57, 47, 0, |
| 0x58, 57, 0, 0x59, 58, 0, |
| 0x5a, 61, 0, 0x5b, 256 % 256, 256 / 256, |
| 0x64, 48, 0, 0x65, 49, 0, |
| 0x66, 62, 0, 0x67, 63, 0, |
| 0x68, 30, 0, 0x69, 31, 0, |
| 0x6a, 32, 0, 0x6b, 33, 0, |
| 0x6c, 40, 0, 0x6d, 41, 0, |
| 0xc8, 128, 0, 0xc9, 192, 0, |
| 0xca, 26, 0, 0xcb, 27, 0, |
| 0xcc, 28, 0, 0xcd, 29, 0, |
| 0xd2, 34, 0, 0xd3, 35, 0, |
| 0xd4, 36, 0, 0xd5, 37, 0, |
| 0xd6, 38, 0, 0xd7, 39, 0, |
| 0xda, 42, 0, 0xdb, 43, 0, |
| 20, 0x4a, 640 % 256, 640 / 256, 0x4b, 704 % 256, |
| 704 / 256, 0x4c, 768 % 256, 768 / 256, 0x4d, 832 % 256, |
| 832 / 256, 0x52, 1280 % 256, 1280 / 256, 0x53, 1344 % 256, |
| 1344 / 256, 0x54, 1408 % 256, 1408 / 256, 0x55, 1472 % 256, |
| 1472 / 256, 0x5a, 1536 % 256, 1536 / 256, 0x5b, 1600 % 256, |
| 1600 / 256, 0x64, 1664 % 256, 1664 / 256, 0x65, 1728 % 256, |
| 1728 / 256, 0x6c, 512 % 256, 512 / 256, 0x6d, 576 % 256, |
| 576 / 256, 0x72, 896 % 256, 896 / 256, 0x73, 960 % 256, |
| 960 / 256, 0x74, 1024 % 256, 1024 / 256, 0x75, 1088 % 256, |
| 1088 / 256, 0x76, 1152 % 256, 1152 / 256, 0x77, 1216 % 256, |
| 1216 / 256, 0xff}; |
| |
| const uint8_t FaxWhiteRunIns[] = { |
| 0, 0, 0, 6, 0x07, 2, |
| 0, 0x08, 3, 0, 0x0B, 4, |
| 0, 0x0C, 5, 0, 0x0E, 6, |
| 0, 0x0F, 7, 0, 6, 0x07, |
| 10, 0, 0x08, 11, 0, 0x12, |
| 128, 0, 0x13, 8, 0, 0x14, |
| 9, 0, 0x1b, 64, 0, 9, |
| 0x03, 13, 0, 0x07, 1, 0, |
| 0x08, 12, 0, 0x17, 192, 0, |
| 0x18, 1664 % 256, 1664 / 256, 0x2a, 16, 0, |
| 0x2B, 17, 0, 0x34, 14, 0, |
| 0x35, 15, 0, 12, 0x03, 22, |
| 0, 0x04, 23, 0, 0x08, 20, |
| 0, 0x0c, 19, 0, 0x13, 26, |
| 0, 0x17, 21, 0, 0x18, 28, |
| 0, 0x24, 27, 0, 0x27, 18, |
| 0, 0x28, 24, 0, 0x2B, 25, |
| 0, 0x37, 256 % 256, 256 / 256, 42, 0x02, |
| 29, 0, 0x03, 30, 0, 0x04, |
| 45, 0, 0x05, 46, 0, 0x0a, |
| 47, 0, 0x0b, 48, 0, 0x12, |
| 33, 0, 0x13, 34, 0, 0x14, |
| 35, 0, 0x15, 36, 0, 0x16, |
| 37, 0, 0x17, 38, 0, 0x1a, |
| 31, 0, 0x1b, 32, 0, 0x24, |
| 53, 0, 0x25, 54, 0, 0x28, |
| 39, 0, 0x29, 40, 0, 0x2a, |
| 41, 0, 0x2b, 42, 0, 0x2c, |
| 43, 0, 0x2d, 44, 0, 0x32, |
| 61, 0, 0x33, 62, 0, 0x34, |
| 63, 0, 0x35, 0, 0, 0x36, |
| 320 % 256, 320 / 256, 0x37, 384 % 256, 384 / 256, 0x4a, |
| 59, 0, 0x4b, 60, 0, 0x52, |
| 49, 0, 0x53, 50, 0, 0x54, |
| 51, 0, 0x55, 52, 0, 0x58, |
| 55, 0, 0x59, 56, 0, 0x5a, |
| 57, 0, 0x5b, 58, 0, 0x64, |
| 448 % 256, 448 / 256, 0x65, 512 % 256, 512 / 256, 0x67, |
| 640 % 256, 640 / 256, 0x68, 576 % 256, 576 / 256, 16, |
| 0x98, 1472 % 256, 1472 / 256, 0x99, 1536 % 256, 1536 / 256, |
| 0x9a, 1600 % 256, 1600 / 256, 0x9b, 1728 % 256, 1728 / 256, |
| 0xcc, 704 % 256, 704 / 256, 0xcd, 768 % 256, 768 / 256, |
| 0xd2, 832 % 256, 832 / 256, 0xd3, 896 % 256, 896 / 256, |
| 0xd4, 960 % 256, 960 / 256, 0xd5, 1024 % 256, 1024 / 256, |
| 0xd6, 1088 % 256, 1088 / 256, 0xd7, 1152 % 256, 1152 / 256, |
| 0xd8, 1216 % 256, 1216 / 256, 0xd9, 1280 % 256, 1280 / 256, |
| 0xda, 1344 % 256, 1344 / 256, 0xdb, 1408 % 256, 1408 / 256, |
| 0, 3, 0x08, 1792 % 256, 1792 / 256, 0x0c, |
| 1856 % 256, 1856 / 256, 0x0d, 1920 % 256, 1920 / 256, 10, |
| 0x12, 1984 % 256, 1984 / 256, 0x13, 2048 % 256, 2048 / 256, |
| 0x14, 2112 % 256, 2112 / 256, 0x15, 2176 % 256, 2176 / 256, |
| 0x16, 2240 % 256, 2240 / 256, 0x17, 2304 % 256, 2304 / 256, |
| 0x1c, 2368 % 256, 2368 / 256, 0x1d, 2432 % 256, 2432 / 256, |
| 0x1e, 2496 % 256, 2496 / 256, 0x1f, 2560 % 256, 2560 / 256, |
| 0xff, |
| }; |
| |
| int FaxGetRun(const uint8_t* ins_array, |
| const uint8_t* src_buf, |
| int& bitpos, |
| int bitsize) { |
| uint32_t code = 0; |
| int ins_off = 0; |
| while (1) { |
| uint8_t ins = ins_array[ins_off++]; |
| if (ins == 0xff) { |
| return -1; |
| } |
| if (bitpos >= bitsize) { |
| return -1; |
| } |
| code <<= 1; |
| if (src_buf[bitpos / 8] & (1 << (7 - bitpos % 8))) { |
| code++; |
| } |
| bitpos++; |
| int next_off = ins_off + ins * 3; |
| for (; ins_off < next_off; ins_off += 3) { |
| if (ins_array[ins_off] == code) { |
| return ins_array[ins_off + 1] + ins_array[ins_off + 2] * 256; |
| } |
| } |
| } |
| } |
| |
| FX_BOOL FaxG4GetRow(const uint8_t* src_buf, |
| int bitsize, |
| int& bitpos, |
| uint8_t* dest_buf, |
| const uint8_t* ref_buf, |
| int columns) { |
| int a0 = -1; |
| bool a0color = true; |
| while (1) { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| int a1, a2, b1, b2; |
| FaxG4FindB1B2(ref_buf, columns, a0, a0color, b1, b2); |
| FX_BOOL bit = NEXTBIT; |
| int v_delta = 0; |
| if (bit) { |
| } else { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| FX_BOOL bit1 = NEXTBIT; |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| FX_BOOL bit2 = NEXTBIT; |
| if (bit1 && bit2) { |
| v_delta = 1; |
| } else if (bit1) { |
| v_delta = -1; |
| } else if (bit2) { |
| int run_len1 = 0; |
| while (1) { |
| int run = FaxGetRun(a0color ? FaxWhiteRunIns : FaxBlackRunIns, |
| src_buf, bitpos, bitsize); |
| run_len1 += run; |
| if (run < 64) { |
| break; |
| } |
| } |
| if (a0 < 0) { |
| run_len1++; |
| } |
| a1 = a0 + run_len1; |
| if (!a0color) { |
| FaxFillBits(dest_buf, columns, a0, a1); |
| } |
| int run_len2 = 0; |
| while (1) { |
| int run = FaxGetRun(a0color ? FaxBlackRunIns : FaxWhiteRunIns, |
| src_buf, bitpos, bitsize); |
| run_len2 += run; |
| if (run < 64) { |
| break; |
| } |
| } |
| a2 = a1 + run_len2; |
| if (a0color) { |
| FaxFillBits(dest_buf, columns, a1, a2); |
| } |
| a0 = a2; |
| if (a0 < columns) { |
| continue; |
| } |
| return TRUE; |
| } else { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| bit = NEXTBIT; |
| if (bit) { |
| if (!a0color) { |
| FaxFillBits(dest_buf, columns, a0, b2); |
| } |
| if (b2 >= columns) { |
| return TRUE; |
| } |
| a0 = b2; |
| continue; |
| } else { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| FX_BOOL bit1 = NEXTBIT; |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| FX_BOOL bit2 = NEXTBIT; |
| if (bit1 && bit2) { |
| v_delta = 2; |
| } else if (bit1) { |
| v_delta = -2; |
| } else if (bit2) { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| bit = NEXTBIT; |
| if (bit) { |
| v_delta = 3; |
| } else { |
| v_delta = -3; |
| } |
| } else { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| bit = NEXTBIT; |
| if (bit) { |
| bitpos += 3; |
| continue; |
| } else { |
| bitpos += 5; |
| return TRUE; |
| } |
| } |
| } |
| } |
| } |
| a1 = b1 + v_delta; |
| if (!a0color) { |
| FaxFillBits(dest_buf, columns, a0, a1); |
| } |
| if (a1 >= columns) { |
| return TRUE; |
| } |
| a0 = a1; |
| a0color = !a0color; |
| } |
| } |
| |
| FX_BOOL FaxSkipEOL(const uint8_t* src_buf, int bitsize, int& bitpos) { |
| int startbit = bitpos; |
| while (bitpos < bitsize) { |
| int bit = NEXTBIT; |
| if (bit) { |
| if (bitpos - startbit <= 11) { |
| bitpos = startbit; |
| } |
| return TRUE; |
| } |
| } |
| return FALSE; |
| } |
| |
| FX_BOOL FaxGet1DLine(const uint8_t* src_buf, |
| int bitsize, |
| int& bitpos, |
| uint8_t* dest_buf, |
| int columns) { |
| bool color = true; |
| int startpos = 0; |
| while (1) { |
| if (bitpos >= bitsize) { |
| return FALSE; |
| } |
| int run_len = 0; |
| while (1) { |
| int run = FaxGetRun(color ? FaxWhiteRunIns : FaxBlackRunIns, src_buf, |
| bitpos, bitsize); |
| if (run < 0) { |
| while (bitpos < bitsize) { |
| int bit = NEXTBIT; |
| if (bit) { |
| return TRUE; |
| } |
| } |
| return FALSE; |
| } |
| run_len += run; |
| if (run < 64) { |
| break; |
| } |
| } |
| if (!color) { |
| FaxFillBits(dest_buf, columns, startpos, startpos + run_len); |
| } |
| startpos += run_len; |
| if (startpos >= columns) { |
| break; |
| } |
| color = !color; |
| } |
| return TRUE; |
| } |
| |
| const uint8_t BlackRunTerminator[128] = { |
| 0x37, 10, 0x02, 3, 0x03, 2, 0x02, 2, 0x03, 3, 0x03, 4, 0x02, 4, |
| 0x03, 5, 0x05, 6, 0x04, 6, 0x04, 7, 0x05, 7, 0x07, 7, 0x04, 8, |
| 0x07, 8, 0x18, 9, 0x17, 10, 0x18, 10, 0x08, 10, 0x67, 11, 0x68, 11, |
| 0x6c, 11, 0x37, 11, 0x28, 11, 0x17, 11, 0x18, 11, 0xca, 12, 0xcb, 12, |
| 0xcc, 12, 0xcd, 12, 0x68, 12, 0x69, 12, 0x6a, 12, 0x6b, 12, 0xd2, 12, |
| 0xd3, 12, 0xd4, 12, 0xd5, 12, 0xd6, 12, 0xd7, 12, 0x6c, 12, 0x6d, 12, |
| 0xda, 12, 0xdb, 12, 0x54, 12, 0x55, 12, 0x56, 12, 0x57, 12, 0x64, 12, |
| 0x65, 12, 0x52, 12, 0x53, 12, 0x24, 12, 0x37, 12, 0x38, 12, 0x27, 12, |
| 0x28, 12, 0x58, 12, 0x59, 12, 0x2b, 12, 0x2c, 12, 0x5a, 12, 0x66, 12, |
| 0x67, 12, |
| }; |
| |
| const uint8_t BlackRunMarkup[80] = { |
| 0x0f, 10, 0xc8, 12, 0xc9, 12, 0x5b, 12, 0x33, 12, 0x34, 12, 0x35, 12, |
| 0x6c, 13, 0x6d, 13, 0x4a, 13, 0x4b, 13, 0x4c, 13, 0x4d, 13, 0x72, 13, |
| 0x73, 13, 0x74, 13, 0x75, 13, 0x76, 13, 0x77, 13, 0x52, 13, 0x53, 13, |
| 0x54, 13, 0x55, 13, 0x5a, 13, 0x5b, 13, 0x64, 13, 0x65, 13, 0x08, 11, |
| 0x0c, 11, 0x0d, 11, 0x12, 12, 0x13, 12, 0x14, 12, 0x15, 12, 0x16, 12, |
| 0x17, 12, 0x1c, 12, 0x1d, 12, 0x1e, 12, 0x1f, 12, |
| }; |
| |
| const uint8_t WhiteRunTerminator[128] = { |
| 0x35, 8, 0x07, 6, 0x07, 4, 0x08, 4, 0x0B, 4, 0x0C, 4, 0x0E, 4, 0x0F, 4, |
| 0x13, 5, 0x14, 5, 0x07, 5, 0x08, 5, 0x08, 6, 0x03, 6, 0x34, 6, 0x35, 6, |
| 0x2a, 6, 0x2B, 6, 0x27, 7, 0x0c, 7, 0x08, 7, 0x17, 7, 0x03, 7, 0x04, 7, |
| 0x28, 7, 0x2B, 7, 0x13, 7, 0x24, 7, 0x18, 7, 0x02, 8, 0x03, 8, 0x1a, 8, |
| 0x1b, 8, 0x12, 8, 0x13, 8, 0x14, 8, 0x15, 8, 0x16, 8, 0x17, 8, 0x28, 8, |
| 0x29, 8, 0x2a, 8, 0x2b, 8, 0x2c, 8, 0x2d, 8, 0x04, 8, 0x05, 8, 0x0a, 8, |
| 0x0b, 8, 0x52, 8, 0x53, 8, 0x54, 8, 0x55, 8, 0x24, 8, 0x25, 8, 0x58, 8, |
| 0x59, 8, 0x5a, 8, 0x5b, 8, 0x4a, 8, 0x4b, 8, 0x32, 8, 0x33, 8, 0x34, 8, |
| }; |
| |
| const uint8_t WhiteRunMarkup[80] = { |
| 0x1b, 5, 0x12, 5, 0x17, 6, 0x37, 7, 0x36, 8, 0x37, 8, 0x64, 8, |
| 0x65, 8, 0x68, 8, 0x67, 8, 0xcc, 9, 0xcd, 9, 0xd2, 9, 0xd3, 9, |
| 0xd4, 9, 0xd5, 9, 0xd6, 9, 0xd7, 9, 0xd8, 9, 0xd9, 9, 0xda, 9, |
| 0xdb, 9, 0x98, 9, 0x99, 9, 0x9a, 9, 0x18, 6, 0x9b, 9, 0x08, 11, |
| 0x0c, 11, 0x0d, 11, 0x12, 12, 0x13, 12, 0x14, 12, 0x15, 12, 0x16, 12, |
| 0x17, 12, 0x1c, 12, 0x1d, 12, 0x1e, 12, 0x1f, 12, |
| }; |
| |
| void AddBitStream(uint8_t* dest_buf, int& dest_bitpos, int data, int bitlen) { |
| for (int i = bitlen - 1; i >= 0; i--) { |
| if (data & (1 << i)) { |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| } |
| dest_bitpos++; |
| } |
| } |
| |
| void FaxEncodeRun(uint8_t* dest_buf, int& dest_bitpos, int run, bool bWhite) { |
| while (run >= 2560) { |
| AddBitStream(dest_buf, dest_bitpos, 0x1f, 12); |
| run -= 2560; |
| } |
| if (run >= 64) { |
| int markup = run - run % 64; |
| const uint8_t* p = bWhite ? WhiteRunMarkup : BlackRunMarkup; |
| p += (markup / 64 - 1) * 2; |
| AddBitStream(dest_buf, dest_bitpos, *p, p[1]); |
| } |
| run %= 64; |
| const uint8_t* p = bWhite ? WhiteRunTerminator : BlackRunTerminator; |
| p += run * 2; |
| AddBitStream(dest_buf, dest_bitpos, *p, p[1]); |
| } |
| |
| void FaxEncode2DLine(uint8_t* dest_buf, |
| int& dest_bitpos, |
| const uint8_t* src_buf, |
| const uint8_t* ref_buf, |
| int cols) { |
| int a0 = -1; |
| bool a0color = true; |
| while (1) { |
| int a1 = FindBit(src_buf, cols, a0 + 1, !a0color); |
| int b1, b2; |
| FaxG4FindB1B2(ref_buf, cols, a0, a0color, b1, b2); |
| if (b2 < a1) { |
| dest_bitpos += 3; |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| dest_bitpos++; |
| a0 = b2; |
| } else if (a1 - b1 <= 3 && b1 - a1 <= 3) { |
| int delta = a1 - b1; |
| switch (delta) { |
| case 0: |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| break; |
| case 1: |
| case 2: |
| case 3: |
| dest_bitpos += delta == 1 ? 1 : delta + 2; |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| dest_bitpos++; |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| break; |
| case -1: |
| case -2: |
| case -3: |
| dest_bitpos += delta == -1 ? 1 : -delta + 2; |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| dest_bitpos++; |
| break; |
| } |
| dest_bitpos++; |
| a0 = a1; |
| a0color = !a0color; |
| } else { |
| int a2 = FindBit(src_buf, cols, a1 + 1, a0color); |
| dest_bitpos++; |
| dest_bitpos++; |
| dest_buf[dest_bitpos / 8] |= 1 << (7 - dest_bitpos % 8); |
| dest_bitpos++; |
| if (a0 < 0) { |
| a0 = 0; |
| } |
| FaxEncodeRun(dest_buf, dest_bitpos, a1 - a0, a0color); |
| FaxEncodeRun(dest_buf, dest_bitpos, a2 - a1, !a0color); |
| a0 = a2; |
| } |
| if (a0 >= cols) { |
| return; |
| } |
| } |
| } |
| |
| } // namespace |
| |
| class CCodec_FaxDecoder : public CCodec_ScanlineDecoder { |
| public: |
| CCodec_FaxDecoder(); |
| ~CCodec_FaxDecoder() override; |
| |
| FX_BOOL Create(const uint8_t* src_buf, |
| uint32_t src_size, |
| int width, |
| int height, |
| int K, |
| FX_BOOL EndOfLine, |
| FX_BOOL EncodedByteAlign, |
| FX_BOOL BlackIs1, |
| int Columns, |
| int Rows); |
| |
| // CCodec_ScanlineDecoder |
| void v_DownScale(int dest_width, int dest_height) override {} |
| FX_BOOL v_Rewind() override; |
| uint8_t* v_GetNextLine() override; |
| uint32_t GetSrcOffset() override; |
| |
| int m_Encoding, m_bEndOfLine, m_bByteAlign, m_bBlack; |
| int bitpos; |
| const uint8_t* m_pSrcBuf; |
| uint32_t m_SrcSize; |
| uint8_t* m_pScanlineBuf; |
| uint8_t* m_pRefBuf; |
| }; |
| |
| CCodec_FaxDecoder::CCodec_FaxDecoder() { |
| m_pScanlineBuf = NULL; |
| m_pRefBuf = NULL; |
| } |
| CCodec_FaxDecoder::~CCodec_FaxDecoder() { |
| FX_Free(m_pScanlineBuf); |
| FX_Free(m_pRefBuf); |
| } |
| FX_BOOL CCodec_FaxDecoder::Create(const uint8_t* src_buf, |
| uint32_t src_size, |
| int width, |
| int height, |
| int K, |
| FX_BOOL EndOfLine, |
| FX_BOOL EncodedByteAlign, |
| FX_BOOL BlackIs1, |
| int Columns, |
| int Rows) { |
| m_Encoding = K; |
| m_bEndOfLine = EndOfLine; |
| m_bByteAlign = EncodedByteAlign; |
| m_bBlack = BlackIs1; |
| m_OrigWidth = Columns; |
| m_OrigHeight = Rows; |
| if (m_OrigWidth == 0) { |
| m_OrigWidth = width; |
| } |
| if (m_OrigHeight == 0) { |
| m_OrigHeight = height; |
| } |
| // Should not overflow. Checked by FPDFAPI_CreateFaxDecoder. |
| m_Pitch = (static_cast<uint32_t>(m_OrigWidth) + 31) / 32 * 4; |
| m_OutputWidth = m_OrigWidth; |
| m_OutputHeight = m_OrigHeight; |
| m_pScanlineBuf = FX_Alloc(uint8_t, m_Pitch); |
| m_pRefBuf = FX_Alloc(uint8_t, m_Pitch); |
| m_pSrcBuf = src_buf; |
| m_SrcSize = src_size; |
| m_nComps = 1; |
| m_bpc = 1; |
| m_bColorTransformed = FALSE; |
| return TRUE; |
| } |
| FX_BOOL CCodec_FaxDecoder::v_Rewind() { |
| FXSYS_memset(m_pRefBuf, 0xff, m_Pitch); |
| bitpos = 0; |
| return TRUE; |
| } |
| uint8_t* CCodec_FaxDecoder::v_GetNextLine() { |
| int bitsize = m_SrcSize * 8; |
| FaxSkipEOL(m_pSrcBuf, bitsize, bitpos); |
| if (bitpos >= bitsize) { |
| return NULL; |
| } |
| FXSYS_memset(m_pScanlineBuf, 0xff, m_Pitch); |
| if (m_Encoding < 0) { |
| FaxG4GetRow(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf, |
| m_OrigWidth); |
| FXSYS_memcpy(m_pRefBuf, m_pScanlineBuf, m_Pitch); |
| } else if (m_Encoding == 0) { |
| FaxGet1DLine(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_OrigWidth); |
| } else { |
| FX_BOOL bNext1D = m_pSrcBuf[bitpos / 8] & (1 << (7 - bitpos % 8)); |
| bitpos++; |
| if (bNext1D) { |
| FaxGet1DLine(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_OrigWidth); |
| } else { |
| FaxG4GetRow(m_pSrcBuf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf, |
| m_OrigWidth); |
| } |
| FXSYS_memcpy(m_pRefBuf, m_pScanlineBuf, m_Pitch); |
| } |
| if (m_bEndOfLine) { |
| FaxSkipEOL(m_pSrcBuf, bitsize, bitpos); |
| } |
| if (m_bByteAlign && bitpos < bitsize) { |
| int bitpos0 = bitpos; |
| int bitpos1 = (bitpos + 7) / 8 * 8; |
| while (m_bByteAlign && bitpos0 < bitpos1) { |
| int bit = m_pSrcBuf[bitpos0 / 8] & (1 << (7 - bitpos0 % 8)); |
| if (bit != 0) { |
| m_bByteAlign = FALSE; |
| } else { |
| bitpos0++; |
| } |
| } |
| if (m_bByteAlign) { |
| bitpos = bitpos1; |
| } |
| } |
| if (m_bBlack) { |
| for (uint32_t i = 0; i < m_Pitch; i++) { |
| m_pScanlineBuf[i] = ~m_pScanlineBuf[i]; |
| } |
| } |
| return m_pScanlineBuf; |
| } |
| uint32_t CCodec_FaxDecoder::GetSrcOffset() { |
| uint32_t ret = (bitpos + 7) / 8; |
| if (ret > m_SrcSize) { |
| ret = m_SrcSize; |
| } |
| return ret; |
| } |
| |
| void FaxG4Decode(const uint8_t* src_buf, |
| uint32_t src_size, |
| int* pbitpos, |
| uint8_t* dest_buf, |
| int width, |
| int height, |
| int pitch) { |
| if (pitch == 0) { |
| pitch = (width + 7) / 8; |
| } |
| uint8_t* ref_buf = FX_Alloc(uint8_t, pitch); |
| FXSYS_memset(ref_buf, 0xff, pitch); |
| int bitpos = *pbitpos; |
| for (int iRow = 0; iRow < height; iRow++) { |
| uint8_t* line_buf = dest_buf + iRow * pitch; |
| FXSYS_memset(line_buf, 0xff, pitch); |
| FaxG4GetRow(src_buf, src_size << 3, bitpos, line_buf, ref_buf, width); |
| FXSYS_memcpy(ref_buf, line_buf, pitch); |
| } |
| FX_Free(ref_buf); |
| *pbitpos = bitpos; |
| } |
| |
| class CCodec_FaxEncoder { |
| public: |
| CCodec_FaxEncoder(const uint8_t* src_buf, int width, int height, int pitch); |
| ~CCodec_FaxEncoder(); |
| void Encode(uint8_t*& dest_buf, uint32_t& dest_size); |
| void Encode2DLine(const uint8_t* scan_line); |
| CFX_BinaryBuf m_DestBuf; |
| uint8_t* m_pRefLine; |
| uint8_t* m_pLineBuf; |
| int m_Cols, m_Rows, m_Pitch; |
| const uint8_t* m_pSrcBuf; |
| }; |
| CCodec_FaxEncoder::CCodec_FaxEncoder(const uint8_t* src_buf, |
| int width, |
| int height, |
| int pitch) { |
| m_pSrcBuf = src_buf; |
| m_Cols = width; |
| m_Rows = height; |
| m_Pitch = pitch; |
| m_pRefLine = FX_Alloc(uint8_t, m_Pitch); |
| FXSYS_memset(m_pRefLine, 0xff, m_Pitch); |
| m_pLineBuf = FX_Alloc2D(uint8_t, m_Pitch, 8); |
| m_DestBuf.EstimateSize(0, 10240); |
| } |
| CCodec_FaxEncoder::~CCodec_FaxEncoder() { |
| FX_Free(m_pRefLine); |
| FX_Free(m_pLineBuf); |
| } |
| void CCodec_FaxEncoder::Encode(uint8_t*& dest_buf, uint32_t& dest_size) { |
| int dest_bitpos = 0; |
| uint8_t last_byte = 0; |
| for (int i = 0; i < m_Rows; i++) { |
| const uint8_t* scan_line = m_pSrcBuf + i * m_Pitch; |
| FXSYS_memset(m_pLineBuf, 0, m_Pitch * 8); |
| m_pLineBuf[0] = last_byte; |
| FaxEncode2DLine(m_pLineBuf, dest_bitpos, scan_line, m_pRefLine, m_Cols); |
| m_DestBuf.AppendBlock(m_pLineBuf, dest_bitpos / 8); |
| last_byte = m_pLineBuf[dest_bitpos / 8]; |
| dest_bitpos %= 8; |
| FXSYS_memcpy(m_pRefLine, scan_line, m_Pitch); |
| } |
| if (dest_bitpos) { |
| m_DestBuf.AppendByte(last_byte); |
| } |
| dest_size = m_DestBuf.GetSize(); |
| dest_buf = m_DestBuf.DetachBuffer(); |
| } |
| FX_BOOL CCodec_FaxModule::Encode(const uint8_t* src_buf, |
| int width, |
| int height, |
| int pitch, |
| uint8_t*& dest_buf, |
| uint32_t& dest_size) { |
| CCodec_FaxEncoder encoder(src_buf, width, height, pitch); |
| encoder.Encode(dest_buf, dest_size); |
| return TRUE; |
| } |
| ICodec_ScanlineDecoder* CCodec_FaxModule::CreateDecoder( |
| const uint8_t* src_buf, |
| uint32_t src_size, |
| int width, |
| int height, |
| int K, |
| FX_BOOL EndOfLine, |
| FX_BOOL EncodedByteAlign, |
| FX_BOOL BlackIs1, |
| int Columns, |
| int Rows) { |
| CCodec_FaxDecoder* pDecoder = new CCodec_FaxDecoder; |
| pDecoder->Create(src_buf, src_size, width, height, K, EndOfLine, |
| EncodedByteAlign, BlackIs1, Columns, Rows); |
| return pDecoder; |
| } |
