// 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 <algorithm>
#include <memory>
#include <vector>
#include "core/fxcodec/codec/ccodec_faxmodule.h"
#include "core/fxcodec/codec/ccodec_scanlinedecoder.h"
#include "core/fxcodec/codec/codec_int.h"
#include "core/fxcrt/cfx_binarybuf.h"
#include "core/fxcrt/fx_memory.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/stl_util.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,
};
// Limit of image dimension, an arbitrary large number.
const int kMaxImageDimension = 0x01FFFF;
int FindBit(const uint8_t* data_buf, int max_pos, int start_pos, int bit) {
ASSERT(start_pos >= 0);
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;
return std::min(leading_pos[data_buf[byte_pos]] + byte_pos * 8, max_pos);
}
void FaxG4FindB1B2(const std::vector<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.data(), columns, a0 + 1, !first_bit);
if (*b1 >= columns) {
*b1 = *b2 = columns;
return;
}
if (first_bit == !a0color) {
*b1 = FindBit(ref_buf.data(), columns, *b1 + 1, first_bit);
first_bit = !first_bit;
}
if (*b1 >= columns) {
*b1 = *b2 = columns;
return;
}
*b2 = FindBit(ref_buf.data(), columns, *b1 + 1, first_bit);
}
void FaxFillBits(uint8_t* dest_buf, int columns, int startpos, int endpos) {
startpos = std::max(startpos, 0);
endpos = pdfium::clamp(endpos, 0, 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;
}
for (int i = startpos % 8; i < 8; ++i)
dest_buf[first_byte] -= 1 << (7 - i);
for (int i = 0; i <= (endpos - 1) % 8; ++i)
dest_buf[last_byte] -= 1 << (7 - i);
if (last_byte > first_byte + 1)
memset(dest_buf + first_byte + 1, 0, last_byte - first_byte - 1);
}
inline bool NextBit(const uint8_t* src_buf, int* bitpos) {
int pos = (*bitpos)++;
return !!(src_buf[pos / 8] & (1 << (7 - pos % 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;
}
}
}
void FaxG4GetRow(const uint8_t* src_buf,
int bitsize,
int* bitpos,
uint8_t* dest_buf,
const std::vector<uint8_t>& ref_buf,
int columns) {
int a0 = -1;
bool a0color = true;
while (1) {
if (*bitpos >= bitsize)
return;
int a1;
int a2;
int b1;
int b2;
FaxG4FindB1B2(ref_buf, columns, a0, a0color, &b1, &b2);
int v_delta = 0;
if (!NextBit(src_buf, bitpos)) {
if (*bitpos >= bitsize)
return;
bool bit1 = NextBit(src_buf, bitpos);
if (*bitpos >= bitsize)
return;
bool bit2 = NextBit(src_buf, bitpos);
if (bit1) {
v_delta = bit2 ? 1 : -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;
if (run_len1 < 0)
return;
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;
}
if (run_len2 < 0)
return;
a2 = a1 + run_len2;
if (a0color)
FaxFillBits(dest_buf, columns, a1, a2);
a0 = a2;
if (a0 < columns)
continue;
return;
} else {
if (*bitpos >= bitsize)
return;
if (NextBit(src_buf, bitpos)) {
if (!a0color)
FaxFillBits(dest_buf, columns, a0, b2);
if (b2 >= columns)
return;
a0 = b2;
continue;
}
if (*bitpos >= bitsize)
return;
bool next_bit1 = NextBit(src_buf, bitpos);
if (*bitpos >= bitsize)
return;
bool next_bit2 = NextBit(src_buf, bitpos);
if (next_bit1) {
v_delta = next_bit2 ? 2 : -2;
} else if (next_bit2) {
if (*bitpos >= bitsize)
return;
v_delta = NextBit(src_buf, bitpos) ? 3 : -3;
} else {
if (*bitpos >= bitsize)
return;
if (NextBit(src_buf, bitpos)) {
*bitpos += 3;
continue;
}
*bitpos += 5;
return;
}
}
}
a1 = b1 + v_delta;
if (!a0color)
FaxFillBits(dest_buf, columns, a0, a1);
if (a1 >= columns)
return;
// The position of picture element must be monotonic increasing.
if (a0 >= a1)
return;
a0 = a1;
a0color = !a0color;
}
}
void FaxSkipEOL(const uint8_t* src_buf, int bitsize, int* bitpos) {
int startbit = *bitpos;
while (*bitpos < bitsize) {
if (!NextBit(src_buf, bitpos))
continue;
if (*bitpos - startbit <= 11)
*bitpos = startbit;
return;
}
}
void FaxGet1DLine(const uint8_t* src_buf,
int bitsize,
int* bitpos,
std::vector<uint8_t>* dest_buf,
int columns) {
bool color = true;
int startpos = 0;
while (1) {
if (*bitpos >= bitsize)
return;
int run_len = 0;
while (1) {
int run = FaxGetRun(color ? FaxWhiteRunIns : FaxBlackRunIns, src_buf,
bitpos, bitsize);
if (run < 0) {
while (*bitpos < bitsize) {
if (NextBit(src_buf, bitpos))
return;
}
return;
}
run_len += run;
if (run < 64)
break;
}
if (!color)
FaxFillBits(dest_buf->data(), columns, startpos, startpos + run_len);
startpos += run_len;
if (startpos >= columns)
break;
color = !color;
}
}
} // namespace
class CCodec_FaxDecoder : public CCodec_ScanlineDecoder {
public:
CCodec_FaxDecoder(const uint8_t* src_buf,
uint32_t src_size,
int width,
int height,
uint32_t pitch,
int K,
bool EndOfLine,
bool EncodedByteAlign,
bool BlackIs1);
~CCodec_FaxDecoder() override;
// CCodec_ScanlineDecoder
bool v_Rewind() override;
uint8_t* v_GetNextLine() override;
uint32_t GetSrcOffset() override;
private:
const int m_Encoding;
int m_bitpos;
bool m_bByteAlign;
const bool m_bEndOfLine;
const bool m_bBlack;
const uint32_t m_SrcSize;
const uint8_t* const m_pSrcBuf;
std::vector<uint8_t> m_ScanlineBuf;
std::vector<uint8_t> m_RefBuf;
};
CCodec_FaxDecoder::CCodec_FaxDecoder(const uint8_t* src_buf,
uint32_t src_size,
int width,
int height,
uint32_t pitch,
int K,
bool EndOfLine,
bool EncodedByteAlign,
bool BlackIs1)
: CCodec_ScanlineDecoder(width, height, width, height, 1, 1, pitch),
m_Encoding(K),
m_bitpos(0),
m_bByteAlign(EncodedByteAlign),
m_bEndOfLine(EndOfLine),
m_bBlack(BlackIs1),
m_SrcSize(src_size),
m_pSrcBuf(src_buf),
m_ScanlineBuf(pitch),
m_RefBuf(pitch) {}
CCodec_FaxDecoder::~CCodec_FaxDecoder() {}
bool CCodec_FaxDecoder::v_Rewind() {
memset(m_RefBuf.data(), 0xff, m_RefBuf.size());
m_bitpos = 0;
return true;
}
uint8_t* CCodec_FaxDecoder::v_GetNextLine() {
int bitsize = m_SrcSize * 8;
FaxSkipEOL(m_pSrcBuf, bitsize, &m_bitpos);
if (m_bitpos >= bitsize)
return nullptr;
memset(m_ScanlineBuf.data(), 0xff, m_ScanlineBuf.size());
if (m_Encoding < 0) {
FaxG4GetRow(m_pSrcBuf, bitsize, &m_bitpos, m_ScanlineBuf.data(), m_RefBuf,
m_OrigWidth);
m_RefBuf = m_ScanlineBuf;
} else if (m_Encoding == 0) {
FaxGet1DLine(m_pSrcBuf, bitsize, &m_bitpos, &m_ScanlineBuf, m_OrigWidth);
} else {
if (NextBit(m_pSrcBuf, &m_bitpos)) {
FaxGet1DLine(m_pSrcBuf, bitsize, &m_bitpos, &m_ScanlineBuf, m_OrigWidth);
} else {
FaxG4GetRow(m_pSrcBuf, bitsize, &m_bitpos, m_ScanlineBuf.data(), m_RefBuf,
m_OrigWidth);
}
m_RefBuf = m_ScanlineBuf;
}
if (m_bEndOfLine)
FaxSkipEOL(m_pSrcBuf, bitsize, &m_bitpos);
if (m_bByteAlign && m_bitpos < bitsize) {
int bitpos0 = m_bitpos;
int bitpos1 = (m_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)
m_bitpos = bitpos1;
}
if (m_bBlack) {
for (uint32_t i = 0; i < m_Pitch; ++i)
m_ScanlineBuf[i] = ~m_ScanlineBuf[i];
}
return m_ScanlineBuf.data();
}
uint32_t CCodec_FaxDecoder::GetSrcOffset() {
return std::min(static_cast<uint32_t>((m_bitpos + 7) / 8), m_SrcSize);
}
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;
std::vector<uint8_t> ref_buf(pitch, 0xff);
int bitpos = *pbitpos;
for (int iRow = 0; iRow < height; iRow++) {
uint8_t* line_buf = dest_buf + iRow * pitch;
memset(line_buf, 0xff, pitch);
FaxG4GetRow(src_buf, src_size << 3, &bitpos, line_buf, ref_buf, width);
memcpy(ref_buf.data(), line_buf, pitch);
}
*pbitpos = bitpos;
}
std::unique_ptr<CCodec_ScanlineDecoder> CCodec_FaxModule::CreateDecoder(
const uint8_t* src_buf,
uint32_t src_size,
int width,
int height,
int K,
bool EndOfLine,
bool EncodedByteAlign,
bool BlackIs1,
int Columns,
int Rows) {
int actual_width = Columns ? Columns : width;
int actual_height = Rows ? Rows : height;
// Reject invalid values.
if (actual_width <= 0 || actual_height <= 0)
return nullptr;
// Reject unreasonable large input.
if (actual_width > kMaxImageDimension || actual_height > kMaxImageDimension)
return nullptr;
uint32_t pitch = (static_cast<uint32_t>(actual_width) + 31) / 32 * 4;
return pdfium::MakeUnique<CCodec_FaxDecoder>(
src_buf, src_size, actual_width, actual_height, pitch, K, EndOfLine,
EncodedByteAlign, BlackIs1);
}
#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
namespace {
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 std::vector<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;
int 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;
}
}
class CCodec_FaxEncoder {
public:
CCodec_FaxEncoder(const uint8_t* src_buf, int width, int height, int pitch);
~CCodec_FaxEncoder();
void Encode(std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
private:
CFX_BinaryBuf m_DestBuf;
std::vector<uint8_t> m_RefLine;
uint8_t* m_pLineBuf;
const int m_Cols;
const int m_Rows;
const int m_Pitch;
const uint8_t* m_pSrcBuf;
};
CCodec_FaxEncoder::CCodec_FaxEncoder(const uint8_t* src_buf,
int width,
int height,
int pitch)
: m_Cols(width), m_Rows(height), m_Pitch(pitch), m_pSrcBuf(src_buf) {
m_RefLine.resize(m_Pitch);
memset(m_RefLine.data(), 0xff, m_Pitch);
m_pLineBuf = FX_Alloc2D(uint8_t, m_Pitch, 8);
m_DestBuf.EstimateSize(0, 10240);
}
CCodec_FaxEncoder::~CCodec_FaxEncoder() {
FX_Free(m_pLineBuf);
}
void CCodec_FaxEncoder::Encode(
std::unique_ptr<uint8_t, FxFreeDeleter>* 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;
memset(m_pLineBuf, 0, m_Pitch * 8);
m_pLineBuf[0] = last_byte;
FaxEncode2DLine(m_pLineBuf, &dest_bitpos, scan_line, m_RefLine, m_Cols);
m_DestBuf.AppendBlock(m_pLineBuf, dest_bitpos / 8);
last_byte = m_pLineBuf[dest_bitpos / 8];
dest_bitpos %= 8;
memcpy(m_RefLine.data(), scan_line, m_Pitch);
}
if (dest_bitpos)
m_DestBuf.AppendByte(last_byte);
*dest_size = m_DestBuf.GetSize();
*dest_buf = m_DestBuf.DetachBuffer();
}
} // namespace
void CCodec_FaxModule::FaxEncode(
const uint8_t* src_buf,
int width,
int height,
int pitch,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size) {
CCodec_FaxEncoder encoder(src_buf, width, height, pitch);
encoder.Encode(dest_buf, dest_size);
}
#endif // _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_