// 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 "../../fx_zlib.h" | |
#include "../../../include/fxcodec/fx_codec.h" | |
#include "codec_int.h" | |
extern "C" | |
{ | |
static void* my_alloc_func (void* opaque, unsigned int items, unsigned int size) | |
{ | |
return FX_Alloc(FX_BYTE, items * size); | |
} | |
static void my_free_func (void* opaque, void* address) | |
{ | |
FX_Free(address); | |
} | |
void* FPDFAPI_FlateInit(void* (*alloc_func)(void*, unsigned int, unsigned int), | |
void (*free_func)(void*, void*)) | |
{ | |
z_stream* p = (z_stream*)alloc_func(0, 1, sizeof(z_stream)); | |
if (p == NULL) { | |
return NULL; | |
} | |
FXSYS_memset32(p, 0, sizeof(z_stream)); | |
p->zalloc = alloc_func; | |
p->zfree = free_func; | |
inflateInit(p); | |
return p; | |
} | |
void FPDFAPI_FlateInput(void* context, const unsigned char* src_buf, unsigned int src_size) | |
{ | |
((z_stream*)context)->next_in = (unsigned char*)src_buf; | |
((z_stream*)context)->avail_in = src_size; | |
} | |
int FPDFAPI_FlateGetTotalOut(void* context) | |
{ | |
return ((z_stream*)context)->total_out; | |
} | |
int FPDFAPI_FlateOutput(void* context, unsigned char* dest_buf, unsigned int dest_size) | |
{ | |
((z_stream*)context)->next_out = dest_buf; | |
((z_stream*)context)->avail_out = dest_size; | |
unsigned int pre_pos = (unsigned int)FPDFAPI_FlateGetTotalOut(context); | |
int ret = inflate((z_stream*)context, Z_SYNC_FLUSH); | |
unsigned int post_pos = (unsigned int)FPDFAPI_FlateGetTotalOut(context); | |
unsigned int written = post_pos - pre_pos; | |
if (written < dest_size) { | |
FXSYS_memset8(dest_buf + written, '\0', dest_size - written); | |
} | |
return ret; | |
} | |
int FPDFAPI_FlateGetTotalIn(void* context) | |
{ | |
return ((z_stream*)context)->total_in; | |
} | |
int FPDFAPI_FlateGetAvailOut(void* context) | |
{ | |
return ((z_stream*)context)->avail_out; | |
} | |
int FPDFAPI_FlateGetAvailIn(void* context) | |
{ | |
return ((z_stream*)context)->avail_in; | |
} | |
void FPDFAPI_FlateEnd(void* context) | |
{ | |
inflateEnd((z_stream*)context); | |
((z_stream*)context)->zfree(0, context); | |
} | |
void FPDFAPI_FlateCompress(unsigned char* dest_buf, unsigned long* dest_size, const unsigned char* src_buf, unsigned long src_size) | |
{ | |
compress(dest_buf, dest_size, src_buf, src_size); | |
} | |
} | |
class CLZWDecoder : public CFX_Object | |
{ | |
public: | |
FX_BOOL Decode(FX_LPBYTE output, FX_DWORD& outlen, const FX_BYTE* input, FX_DWORD& size, FX_BOOL bEarlyChange); | |
private: | |
FX_DWORD m_InPos; | |
FX_DWORD m_OutPos; | |
FX_LPBYTE m_pOutput; | |
const FX_BYTE* m_pInput; | |
FX_BOOL m_Early; | |
void AddCode(FX_DWORD prefix_code, FX_BYTE append_char); | |
FX_DWORD m_CodeArray[5021]; | |
FX_DWORD m_nCodes; | |
FX_BYTE m_DecodeStack[4000]; | |
FX_DWORD m_StackLen; | |
void DecodeString(FX_DWORD code); | |
int m_CodeLen; | |
}; | |
void CLZWDecoder::AddCode(FX_DWORD prefix_code, FX_BYTE append_char) | |
{ | |
if (m_nCodes + m_Early == 4094) { | |
return; | |
} | |
m_CodeArray[m_nCodes ++] = (prefix_code << 16) | append_char; | |
if (m_nCodes + m_Early == 512 - 258) { | |
m_CodeLen = 10; | |
} else if (m_nCodes + m_Early == 1024 - 258) { | |
m_CodeLen = 11; | |
} else if (m_nCodes + m_Early == 2048 - 258) { | |
m_CodeLen = 12; | |
} | |
} | |
void CLZWDecoder::DecodeString(FX_DWORD code) | |
{ | |
while (1) { | |
int index = code - 258; | |
if (index < 0 || index >= (int)m_nCodes) { | |
break; | |
} | |
FX_DWORD data = m_CodeArray[index]; | |
if (m_StackLen >= sizeof(m_DecodeStack)) { | |
return; | |
} | |
m_DecodeStack[m_StackLen++] = (FX_BYTE)data; | |
code = data >> 16; | |
} | |
if (m_StackLen >= sizeof(m_DecodeStack)) { | |
return; | |
} | |
m_DecodeStack[m_StackLen++] = (FX_BYTE)code; | |
} | |
int CLZWDecoder::Decode(FX_LPBYTE dest_buf, FX_DWORD& dest_size, const FX_BYTE* src_buf, FX_DWORD& src_size, FX_BOOL bEarlyChange) | |
{ | |
m_CodeLen = 9; | |
m_InPos = 0; | |
m_OutPos = 0; | |
m_pInput = src_buf; | |
m_pOutput = dest_buf; | |
m_Early = bEarlyChange ? 1 : 0; | |
m_nCodes = 0; | |
FX_DWORD old_code = (FX_DWORD) - 1; | |
FX_BYTE last_char; | |
while (1) { | |
if (m_InPos + m_CodeLen > src_size * 8) { | |
break; | |
} | |
int byte_pos = m_InPos / 8; | |
int bit_pos = m_InPos % 8, bit_left = m_CodeLen; | |
FX_DWORD code = 0; | |
if (bit_pos) { | |
bit_left -= 8 - bit_pos; | |
code = (m_pInput[byte_pos++] & ((1 << (8 - bit_pos)) - 1)) << bit_left; | |
} | |
if (bit_left < 8) { | |
code |= m_pInput[byte_pos] >> (8 - bit_left); | |
} else { | |
bit_left -= 8; | |
code |= m_pInput[byte_pos++] << bit_left; | |
if (bit_left) { | |
code |= m_pInput[byte_pos] >> (8 - bit_left); | |
} | |
} | |
m_InPos += m_CodeLen; | |
if (code < 256) { | |
if (m_OutPos == dest_size) { | |
return -5; | |
} | |
if (m_pOutput) { | |
m_pOutput[m_OutPos] = (FX_BYTE)code; | |
} | |
m_OutPos ++; | |
last_char = (FX_BYTE)code; | |
if (old_code != (FX_DWORD) - 1) { | |
AddCode(old_code, last_char); | |
} | |
old_code = code; | |
} else if (code == 256) { | |
m_CodeLen = 9; | |
m_nCodes = 0; | |
old_code = (FX_DWORD) - 1; | |
} else if (code == 257) { | |
break; | |
} else { | |
if (old_code == (FX_DWORD) - 1) { | |
return 2; | |
} | |
m_StackLen = 0; | |
if (code >= m_nCodes + 258) { | |
if (m_StackLen < sizeof(m_DecodeStack)) { | |
m_DecodeStack[m_StackLen++] = last_char; | |
} | |
DecodeString(old_code); | |
} else { | |
DecodeString(code); | |
} | |
if (m_OutPos + m_StackLen > dest_size) { | |
return -5; | |
} | |
if (m_pOutput) { | |
for (FX_DWORD i = 0; i < m_StackLen; i ++) { | |
m_pOutput[m_OutPos + i] = m_DecodeStack[m_StackLen - i - 1]; | |
} | |
} | |
m_OutPos += m_StackLen; | |
last_char = m_DecodeStack[m_StackLen - 1]; | |
if (old_code < 256) { | |
AddCode(old_code, last_char); | |
} else if (old_code - 258 >= m_nCodes) { | |
dest_size = m_OutPos; | |
src_size = (m_InPos + 7) / 8; | |
return 0; | |
} else { | |
AddCode(old_code, last_char); | |
} | |
old_code = code; | |
} | |
} | |
dest_size = m_OutPos; | |
src_size = (m_InPos + 7) / 8; | |
return 0; | |
} | |
static FX_BYTE PaethPredictor(int a, int b, int c) | |
{ | |
int p = a + b - c; | |
int pa = FXSYS_abs(p - a); | |
int pb = FXSYS_abs(p - b); | |
int pc = FXSYS_abs(p - c); | |
if (pa <= pb && pa <= pc) { | |
return (FX_BYTE)a; | |
} | |
if (pb <= pc) { | |
return (FX_BYTE)b; | |
} | |
return (FX_BYTE)c; | |
} | |
static void PNG_PredictorEncode(FX_LPBYTE& data_buf, FX_DWORD& data_size, int predictor, int Colors, int BitsPerComponent, int Columns) | |
{ | |
int BytesPerPixel = (Colors * BitsPerComponent + 7) / 8; | |
int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; | |
int row_count = (data_size + row_size - 1) / row_size; | |
int last_row_size = data_size % row_size; | |
FX_LPBYTE dest_buf = FX_Alloc( FX_BYTE, (row_size + 1) * row_count); | |
if (dest_buf == NULL) { | |
return; | |
} | |
int byte_cnt = 0; | |
FX_LPBYTE pSrcData = data_buf; | |
FX_LPBYTE pDestData = dest_buf; | |
for (int row = 0; row < row_count; row++) { | |
if (predictor == 10) { | |
pDestData[0] = 0; | |
int move_size = row_size; | |
if (move_size * (row + 1) > (int)data_size) { | |
move_size = data_size - (move_size * row); | |
} | |
FXSYS_memmove32(pDestData + 1, pSrcData, move_size); | |
pDestData += (move_size + 1); | |
pSrcData += move_size; | |
byte_cnt += move_size; | |
continue; | |
} | |
for (int byte = 0; byte < row_size && byte_cnt < (int)data_size; byte++) { | |
switch (predictor) { | |
case 11: { | |
pDestData[0] = 1; | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pSrcData[byte - BytesPerPixel]; | |
} | |
pDestData[byte + 1] = pSrcData[byte] - left; | |
} | |
break; | |
case 12: { | |
pDestData[0] = 2; | |
FX_BYTE up = 0; | |
if (row) { | |
up = pSrcData[byte - row_size]; | |
} | |
pDestData[byte + 1] = pSrcData[byte] - up; | |
} | |
break; | |
case 13: { | |
pDestData[0] = 3; | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pSrcData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (row) { | |
up = pSrcData[byte - row_size]; | |
} | |
pDestData[byte + 1] = pSrcData[byte] - (left + up) / 2; | |
} | |
break; | |
case 14: { | |
pDestData[0] = 4; | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pSrcData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (row) { | |
up = pSrcData[byte - row_size]; | |
} | |
FX_BYTE upper_left = 0; | |
if (byte >= BytesPerPixel && row) { | |
upper_left = pSrcData[byte - row_size - BytesPerPixel]; | |
} | |
pDestData[byte + 1] = pSrcData[byte] - PaethPredictor(left, up, upper_left); | |
} | |
break; | |
default: { | |
pDestData[byte + 1] = pSrcData[byte]; | |
} | |
break; | |
} | |
byte_cnt++; | |
} | |
pDestData += (row_size + 1); | |
pSrcData += row_size; | |
} | |
FX_Free(data_buf); | |
data_buf = dest_buf; | |
data_size = (row_size + 1) * row_count - (last_row_size > 0 ? (row_size - last_row_size) : 0); | |
} | |
static void PNG_PredictLine(FX_LPBYTE pDestData, FX_LPCBYTE pSrcData, FX_LPCBYTE pLastLine, | |
int bpc, int nColors, int nPixels) | |
{ | |
int row_size = (nPixels * bpc * nColors + 7) / 8; | |
int BytesPerPixel = (bpc * nColors + 7) / 8; | |
FX_BYTE tag = pSrcData[0]; | |
if (tag == 0) { | |
FXSYS_memmove32(pDestData, pSrcData + 1, row_size); | |
return; | |
} | |
for (int byte = 0; byte < row_size; byte ++) { | |
FX_BYTE raw_byte = pSrcData[byte + 1]; | |
switch (tag) { | |
case 1: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
pDestData[byte] = raw_byte + left; | |
break; | |
} | |
case 2: { | |
FX_BYTE up = 0; | |
if (pLastLine) { | |
up = pLastLine[byte]; | |
} | |
pDestData[byte] = raw_byte + up; | |
break; | |
} | |
case 3: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (pLastLine) { | |
up = pLastLine[byte]; | |
} | |
pDestData[byte] = raw_byte + (up + left) / 2; | |
break; | |
} | |
case 4: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (pLastLine) { | |
up = pLastLine[byte]; | |
} | |
FX_BYTE upper_left = 0; | |
if (byte >= BytesPerPixel && pLastLine) { | |
upper_left = pLastLine[byte - BytesPerPixel]; | |
} | |
pDestData[byte] = raw_byte + PaethPredictor(left, up, upper_left); | |
break; | |
} | |
default: | |
pDestData[byte] = raw_byte; | |
break; | |
} | |
} | |
} | |
static void PNG_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, | |
int Colors, int BitsPerComponent, int Columns) | |
{ | |
int BytesPerPixel = (Colors * BitsPerComponent + 7) / 8; | |
int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; | |
int row_count = (data_size + row_size) / (row_size + 1); | |
int last_row_size = data_size % (row_size + 1); | |
FX_LPBYTE dest_buf = FX_Alloc( FX_BYTE, row_size * row_count); | |
if (dest_buf == NULL) { | |
return; | |
} | |
int byte_cnt = 0; | |
FX_LPBYTE pSrcData = data_buf; | |
FX_LPBYTE pDestData = dest_buf; | |
for (int row = 0; row < row_count; row ++) { | |
FX_BYTE tag = pSrcData[0]; | |
if (tag == 0) { | |
int move_size = row_size; | |
if ((row + 1) * (move_size + 1) > (int)data_size) { | |
move_size = last_row_size - 1; | |
} | |
FXSYS_memmove32(pDestData, pSrcData + 1, move_size); | |
pSrcData += move_size + 1; | |
pDestData += move_size; | |
byte_cnt += move_size + 1; | |
continue; | |
} | |
for (int byte = 0; byte < row_size && byte_cnt < (int)data_size; byte ++) { | |
FX_BYTE raw_byte = pSrcData[byte + 1]; | |
switch (tag) { | |
case 1: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
pDestData[byte] = raw_byte + left; | |
break; | |
} | |
case 2: { | |
FX_BYTE up = 0; | |
if (row) { | |
up = pDestData[byte - row_size]; | |
} | |
pDestData[byte] = raw_byte + up; | |
break; | |
} | |
case 3: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (row) { | |
up = pDestData[byte - row_size]; | |
} | |
pDestData[byte] = raw_byte + (up + left) / 2; | |
break; | |
} | |
case 4: { | |
FX_BYTE left = 0; | |
if (byte >= BytesPerPixel) { | |
left = pDestData[byte - BytesPerPixel]; | |
} | |
FX_BYTE up = 0; | |
if (row) { | |
up = pDestData[byte - row_size]; | |
} | |
FX_BYTE upper_left = 0; | |
if (byte >= BytesPerPixel && row) { | |
upper_left = pDestData[byte - row_size - BytesPerPixel]; | |
} | |
pDestData[byte] = raw_byte + PaethPredictor(left, up, upper_left); | |
break; | |
} | |
default: | |
pDestData[byte] = raw_byte; | |
break; | |
} | |
byte_cnt++; | |
} | |
pSrcData += row_size + 1; | |
pDestData += row_size; | |
byte_cnt++; | |
} | |
FX_Free(data_buf); | |
data_buf = dest_buf; | |
data_size = row_size * row_count - (last_row_size > 0 ? (row_size + 1 - last_row_size) : 0); | |
} | |
static void TIFF_PredictorEncodeLine(FX_LPBYTE dest_buf, int row_size, int BitsPerComponent, int Colors, int Columns) | |
{ | |
int BytesPerPixel = BitsPerComponent * Colors / 8; | |
if (BitsPerComponent < 8) { | |
FX_BYTE mask = 0x01; | |
if (BitsPerComponent == 2) { | |
mask = 0x03; | |
} else if (BitsPerComponent == 4) { | |
mask = 0x0F; | |
} | |
int row_bits = Colors * BitsPerComponent * Columns; | |
for (int i = row_bits - BitsPerComponent; i >= BitsPerComponent; i -= BitsPerComponent) { | |
int col = i % 8; | |
int index = i / 8; | |
int col_pre = (col == 0) ? (8 - BitsPerComponent) : (col - BitsPerComponent); | |
int index_pre = (col == 0) ? (index - 1) : index; | |
FX_BYTE cur = (dest_buf[index] >> (8 - col - BitsPerComponent)) & mask; | |
FX_BYTE left = (dest_buf[index_pre] >> (8 - col_pre - BitsPerComponent)) & mask; | |
cur -= left; | |
cur &= mask; | |
cur <<= (8 - col - BitsPerComponent); | |
dest_buf[index] &= ~(mask << ((8 - col - BitsPerComponent))); | |
dest_buf[index] |= cur; | |
} | |
} else if (BitsPerComponent == 8) { | |
for (int i = row_size - 1; i >= BytesPerPixel; i--) { | |
dest_buf[i] -= dest_buf[i - BytesPerPixel]; | |
} | |
} else { | |
for (int i = row_size - BytesPerPixel; i >= BytesPerPixel; i -= BytesPerPixel) { | |
FX_WORD pixel = (dest_buf[i] << 8) | dest_buf[i + 1]; | |
pixel -= (dest_buf[i - BytesPerPixel] << 8) | dest_buf[i - BytesPerPixel + 1]; | |
dest_buf[i] = pixel >> 8; | |
dest_buf[i + 1] = (FX_BYTE)pixel; | |
} | |
} | |
} | |
static void TIFF_PredictorEncode(FX_LPBYTE& data_buf, FX_DWORD& data_size, | |
int Colors, int BitsPerComponent, int Columns) | |
{ | |
int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; | |
int row_count = (data_size + row_size - 1) / row_size; | |
int last_row_size = data_size % row_size; | |
for (int row = 0; row < row_count; row++) { | |
FX_LPBYTE scan_line = data_buf + row * row_size; | |
if ((row + 1) * row_size > (int)data_size) { | |
row_size = last_row_size; | |
} | |
TIFF_PredictorEncodeLine(scan_line, row_size, BitsPerComponent, Colors, Columns); | |
} | |
} | |
static void TIFF_PredictLine(FX_LPBYTE dest_buf, int row_size, int BitsPerComponent, int Colors, int Columns) | |
{ | |
if (BitsPerComponent == 1) { | |
int row_bits = BitsPerComponent * Colors * Columns; | |
for(int i = 1; i < row_bits; i ++) { | |
int col = i % 8; | |
int index = i / 8; | |
int index_pre = (col == 0) ? (index - 1) : index; | |
int col_pre = (col == 0) ? 8 : col; | |
if( ((dest_buf[index] >> (7 - col)) & 1) ^ ((dest_buf[index_pre] >> (8 - col_pre)) & 1) ) { | |
dest_buf[index] |= 1 << (7 - col); | |
} else { | |
dest_buf[index] &= ~(1 << (7 - col)); | |
} | |
} | |
return; | |
} | |
int BytesPerPixel = BitsPerComponent * Colors / 8; | |
if (BitsPerComponent == 16) { | |
for (int i = BytesPerPixel; i < row_size; i += 2) { | |
FX_WORD pixel = (dest_buf[i - BytesPerPixel] << 8) | dest_buf[i - BytesPerPixel + 1]; | |
pixel += (dest_buf[i] << 8) | dest_buf[i + 1]; | |
dest_buf[i] = pixel >> 8; | |
dest_buf[i + 1] = (FX_BYTE)pixel; | |
} | |
} else { | |
for (int i = BytesPerPixel; i < row_size; i ++) { | |
dest_buf[i] += dest_buf[i - BytesPerPixel]; | |
} | |
} | |
} | |
static void TIFF_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, | |
int Colors, int BitsPerComponent, int Columns) | |
{ | |
int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; | |
int row_count = (data_size + row_size - 1) / row_size; | |
int last_row_size = data_size % row_size; | |
for (int row = 0; row < row_count; row ++) { | |
FX_LPBYTE scan_line = data_buf + row * row_size; | |
if ((row + 1) * row_size > (int)data_size) { | |
row_size = last_row_size; | |
} | |
TIFF_PredictLine(scan_line, row_size, BitsPerComponent, Colors, Columns); | |
} | |
} | |
class CCodec_FlateScanlineDecoder : public CCodec_ScanlineDecoder | |
{ | |
public: | |
CCodec_FlateScanlineDecoder(); | |
~CCodec_FlateScanlineDecoder(); | |
FX_BOOL Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, int nComps, int bpc, | |
int predictor, int Colors, int BitsPerComponent, int Columns); | |
virtual void Destroy() | |
{ | |
delete this; | |
} | |
virtual void v_DownScale(int dest_width, int dest_height) {} | |
virtual FX_BOOL v_Rewind(); | |
virtual FX_LPBYTE v_GetNextLine(); | |
virtual FX_DWORD GetSrcOffset(); | |
void* m_pFlate; | |
FX_LPCBYTE m_SrcBuf; | |
FX_DWORD m_SrcSize; | |
FX_LPBYTE m_pScanline; | |
FX_LPBYTE m_pLastLine; | |
FX_LPBYTE m_pPredictBuffer; | |
FX_LPBYTE m_pPredictRaw; | |
int m_Predictor; | |
int m_Colors, m_BitsPerComponent, m_Columns, m_PredictPitch, m_LeftOver; | |
}; | |
CCodec_FlateScanlineDecoder::CCodec_FlateScanlineDecoder() | |
{ | |
m_pFlate = NULL; | |
m_pScanline = NULL; | |
m_pLastLine = NULL; | |
m_pPredictBuffer = NULL; | |
m_pPredictRaw = NULL; | |
m_LeftOver = 0; | |
} | |
CCodec_FlateScanlineDecoder::~CCodec_FlateScanlineDecoder() | |
{ | |
if (m_pScanline) { | |
FX_Free(m_pScanline); | |
} | |
if (m_pLastLine) { | |
FX_Free(m_pLastLine); | |
} | |
if (m_pPredictBuffer) { | |
FX_Free(m_pPredictBuffer); | |
} | |
if (m_pPredictRaw) { | |
FX_Free(m_pPredictRaw); | |
} | |
if (m_pFlate) { | |
FPDFAPI_FlateEnd(m_pFlate); | |
} | |
} | |
FX_BOOL CCodec_FlateScanlineDecoder::Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, | |
int nComps, int bpc, int predictor, int Colors, int BitsPerComponent, int Columns) | |
{ | |
m_SrcBuf = src_buf; | |
m_SrcSize = src_size; | |
m_OutputWidth = m_OrigWidth = width; | |
m_OutputHeight = m_OrigHeight = height; | |
m_nComps = nComps; | |
m_bpc = bpc; | |
m_bColorTransformed = FALSE; | |
m_Pitch = (width * nComps * bpc + 7) / 8; | |
m_pScanline = FX_Alloc(FX_BYTE, m_Pitch); | |
if (m_pScanline == NULL) { | |
return FALSE; | |
} | |
m_Predictor = 0; | |
if (predictor) { | |
if (predictor >= 10) { | |
m_Predictor = 2; | |
} else if (predictor == 2) { | |
m_Predictor = 1; | |
} | |
if (m_Predictor) { | |
if (BitsPerComponent * Colors * Columns == 0) { | |
BitsPerComponent = m_bpc; | |
Colors = m_nComps; | |
Columns = m_OrigWidth; | |
} | |
m_Colors = Colors; | |
m_BitsPerComponent = BitsPerComponent; | |
m_Columns = Columns; | |
m_PredictPitch = (m_BitsPerComponent * m_Colors * m_Columns + 7) / 8; | |
m_pLastLine = FX_Alloc(FX_BYTE, m_PredictPitch); | |
if (m_pLastLine == NULL) { | |
return FALSE; | |
} | |
FXSYS_memset32(m_pLastLine, 0, m_PredictPitch); | |
m_pPredictRaw = FX_Alloc(FX_BYTE, m_PredictPitch + 1); | |
if (m_pPredictRaw == NULL) { | |
return FALSE; | |
} | |
m_pPredictBuffer = FX_Alloc(FX_BYTE, m_PredictPitch); | |
if (m_pPredictBuffer == NULL) { | |
return FALSE; | |
} | |
} | |
} | |
return TRUE; | |
} | |
FX_BOOL CCodec_FlateScanlineDecoder::v_Rewind() | |
{ | |
if (m_pFlate) { | |
FPDFAPI_FlateEnd(m_pFlate); | |
} | |
m_pFlate = FPDFAPI_FlateInit(my_alloc_func, my_free_func); | |
if (m_pFlate == NULL) { | |
return FALSE; | |
} | |
FPDFAPI_FlateInput(m_pFlate, m_SrcBuf, m_SrcSize); | |
m_LeftOver = 0; | |
return TRUE; | |
} | |
FX_LPBYTE CCodec_FlateScanlineDecoder::v_GetNextLine() | |
{ | |
if (m_Predictor) { | |
if (m_Pitch == m_PredictPitch) { | |
if (m_Predictor == 2) { | |
FPDFAPI_FlateOutput(m_pFlate, m_pPredictRaw, m_PredictPitch + 1); | |
PNG_PredictLine(m_pScanline, m_pPredictRaw, m_pLastLine, m_BitsPerComponent, m_Colors, m_Columns); | |
FXSYS_memcpy32(m_pLastLine, m_pScanline, m_PredictPitch); | |
} else { | |
FPDFAPI_FlateOutput(m_pFlate, m_pScanline, m_Pitch); | |
TIFF_PredictLine(m_pScanline, m_PredictPitch, m_bpc, m_nComps, m_OutputWidth); | |
} | |
} else { | |
int bytes_to_go = m_Pitch; | |
int read_leftover = m_LeftOver > bytes_to_go ? bytes_to_go : m_LeftOver; | |
if (read_leftover) { | |
FXSYS_memcpy32(m_pScanline, m_pPredictBuffer + m_PredictPitch - m_LeftOver, read_leftover); | |
m_LeftOver -= read_leftover; | |
bytes_to_go -= read_leftover; | |
} | |
while (bytes_to_go) { | |
if (m_Predictor == 2) { | |
FPDFAPI_FlateOutput(m_pFlate, m_pPredictRaw, m_PredictPitch + 1); | |
PNG_PredictLine(m_pPredictBuffer, m_pPredictRaw, m_pLastLine, m_BitsPerComponent, m_Colors, m_Columns); | |
FXSYS_memcpy32(m_pLastLine, m_pPredictBuffer, m_PredictPitch); | |
} else { | |
FPDFAPI_FlateOutput(m_pFlate, m_pPredictBuffer, m_PredictPitch); | |
TIFF_PredictLine(m_pPredictBuffer, m_PredictPitch, m_BitsPerComponent, m_Colors, m_Columns); | |
} | |
int read_bytes = m_PredictPitch > bytes_to_go ? bytes_to_go : m_PredictPitch; | |
FXSYS_memcpy32(m_pScanline + m_Pitch - bytes_to_go, m_pPredictBuffer, read_bytes); | |
m_LeftOver += m_PredictPitch - read_bytes; | |
bytes_to_go -= read_bytes; | |
} | |
} | |
} else { | |
FPDFAPI_FlateOutput(m_pFlate, m_pScanline, m_Pitch); | |
} | |
return m_pScanline; | |
} | |
FX_DWORD CCodec_FlateScanlineDecoder::GetSrcOffset() | |
{ | |
return FPDFAPI_FlateGetTotalIn(m_pFlate); | |
} | |
static void FlateUncompress(FX_LPCBYTE src_buf, FX_DWORD src_size, FX_DWORD orig_size, | |
FX_LPBYTE& dest_buf, FX_DWORD& dest_size, FX_DWORD& offset) | |
{ | |
FX_DWORD guess_size = orig_size ? orig_size : src_size * 2; | |
FX_DWORD alloc_step = orig_size ? 10240 : (src_size < 10240 ? 10240 : src_size); | |
static const FX_DWORD kMaxInitialAllocSize = 10000000; | |
if (guess_size > kMaxInitialAllocSize) { | |
guess_size = kMaxInitialAllocSize; | |
alloc_step = kMaxInitialAllocSize; | |
} | |
FX_LPBYTE guess_buf = FX_Alloc(FX_BYTE, guess_size + 1); | |
if (!guess_buf) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
guess_buf[guess_size] = '\0'; | |
FX_BOOL useOldImpl = src_size < 10240; | |
void* context = FPDFAPI_FlateInit(my_alloc_func, my_free_func); | |
if (context == NULL) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return ; | |
} | |
FPDFAPI_FlateInput(context, src_buf, src_size); | |
CFX_ArrayTemplate<FX_LPBYTE> result_tmp_bufs; | |
FX_LPBYTE buf = guess_buf; | |
FX_DWORD buf_size = guess_size; | |
FX_DWORD last_buf_size = buf_size; | |
while (1) { | |
FX_INT32 ret = FPDFAPI_FlateOutput(context, buf, buf_size); | |
FX_INT32 avail_buf_size = FPDFAPI_FlateGetAvailOut(context); | |
if (!useOldImpl) { | |
if (ret != Z_OK) { | |
last_buf_size = buf_size - avail_buf_size; | |
result_tmp_bufs.Add(buf); | |
break; | |
} | |
if (avail_buf_size == 0) { | |
result_tmp_bufs.Add(buf); | |
buf = NULL; | |
buf = FX_Alloc(FX_BYTE, buf_size + 1); | |
if (!buf) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
buf[buf_size] = '\0'; | |
} else { | |
last_buf_size = buf_size - avail_buf_size; | |
result_tmp_bufs.Add(buf); | |
buf = NULL; | |
break; | |
} | |
} else { | |
if (ret != Z_OK) { | |
break; | |
} | |
if (avail_buf_size == 0) { | |
FX_DWORD old_size = guess_size; | |
guess_size += alloc_step; | |
if (guess_size < old_size || guess_size + 1 < guess_size) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
guess_buf = FX_Realloc(FX_BYTE, guess_buf, guess_size + 1); | |
if (!guess_buf) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
guess_buf[guess_size] = '\0'; | |
buf = guess_buf + old_size; | |
buf_size = guess_size - old_size; | |
} else { | |
break; | |
} | |
} | |
} | |
dest_size = FPDFAPI_FlateGetTotalOut(context); | |
offset = FPDFAPI_FlateGetTotalIn(context); | |
if (!useOldImpl) { | |
if (result_tmp_bufs.GetSize() == 1) { | |
dest_buf = result_tmp_bufs[0]; | |
} else { | |
FX_LPBYTE result_buf = FX_Alloc(FX_BYTE, dest_size); | |
if (!result_buf) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
FX_DWORD result_pos = 0; | |
for (FX_INT32 i = 0; i < result_tmp_bufs.GetSize(); i++) { | |
FX_LPBYTE tmp_buf = result_tmp_bufs[i]; | |
FX_DWORD tmp_buf_size = buf_size; | |
if (i == result_tmp_bufs.GetSize() - 1) { | |
tmp_buf_size = last_buf_size; | |
} | |
FXSYS_memcpy32(result_buf + result_pos, tmp_buf, tmp_buf_size); | |
result_pos += tmp_buf_size; | |
FX_Free(tmp_buf); | |
tmp_buf = NULL; | |
result_tmp_bufs[i] = NULL; | |
} | |
dest_buf = result_buf; | |
} | |
} else { | |
if (guess_size / 2 > dest_size) { | |
guess_buf = FX_Realloc(FX_BYTE, guess_buf, dest_size + 1); | |
if (!guess_buf) { | |
dest_buf = NULL; | |
dest_size = 0; | |
return; | |
} | |
guess_size = dest_size; | |
guess_buf[guess_size] = '\0'; | |
} | |
dest_buf = guess_buf; | |
} | |
FPDFAPI_FlateEnd(context); | |
context = NULL; | |
} | |
ICodec_ScanlineDecoder* CCodec_FlateModule::CreateDecoder(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, | |
int nComps, int bpc, int predictor, int Colors, int BitsPerComponent, int Columns) | |
{ | |
CCodec_FlateScanlineDecoder* pDecoder = FX_NEW CCodec_FlateScanlineDecoder; | |
if (pDecoder == NULL) { | |
return NULL; | |
} | |
pDecoder->Create(src_buf, src_size, width, height, nComps, bpc, predictor, Colors, BitsPerComponent, Columns); | |
return pDecoder; | |
} | |
FX_DWORD CCodec_FlateModule::FlateOrLZWDecode(FX_BOOL bLZW, const FX_BYTE* src_buf, FX_DWORD src_size, FX_BOOL bEarlyChange, | |
int predictor, int Colors, int BitsPerComponent, int Columns, | |
FX_DWORD estimated_size, FX_LPBYTE& dest_buf, FX_DWORD& dest_size) | |
{ | |
CLZWDecoder* pDecoder = NULL; | |
dest_buf = NULL; | |
FX_DWORD offset = 0; | |
int predictor_type = 0; | |
if (predictor) { | |
if (predictor >= 10) { | |
predictor_type = 2; | |
} else if (predictor == 2) { | |
predictor_type = 1; | |
} | |
} | |
if (bLZW) { | |
pDecoder = FX_NEW CLZWDecoder; | |
if (pDecoder == NULL) { | |
return -1; | |
} | |
dest_size = (FX_DWORD) - 1; | |
offset = src_size; | |
int err = pDecoder->Decode(NULL, dest_size, src_buf, offset, bEarlyChange); | |
delete pDecoder; | |
if (err || dest_size == 0 || dest_size + 1 < dest_size) { | |
return (FX_DWORD) - 1; | |
} | |
pDecoder = FX_NEW CLZWDecoder; | |
if (pDecoder == NULL) { | |
return -1; | |
} | |
dest_buf = FX_Alloc( FX_BYTE, dest_size + 1); | |
if (dest_buf == NULL) { | |
return -1; | |
} | |
dest_buf[dest_size] = '\0'; | |
pDecoder->Decode(dest_buf, dest_size, src_buf, offset, bEarlyChange); | |
delete pDecoder; | |
} else { | |
FlateUncompress(src_buf, src_size, estimated_size, dest_buf, dest_size, offset); | |
} | |
if (predictor_type == 0) { | |
return offset; | |
} | |
if (predictor_type == 2) { | |
PNG_Predictor(dest_buf, dest_size, Colors, BitsPerComponent, Columns); | |
} else if (predictor_type == 1) { | |
TIFF_Predictor(dest_buf, dest_size, Colors, BitsPerComponent, Columns); | |
} | |
return offset; | |
} | |
FX_BOOL CCodec_FlateModule::Encode(const FX_BYTE* src_buf, FX_DWORD src_size, | |
int predictor, int Colors, int BitsPerComponent, int Columns, | |
FX_LPBYTE& dest_buf, FX_DWORD& dest_size) | |
{ | |
if (predictor != 2 && predictor < 10) { | |
return Encode(src_buf, src_size, dest_buf, dest_size); | |
} | |
FX_BOOL ret = FALSE; | |
FX_LPBYTE pSrcBuf = NULL; | |
pSrcBuf = FX_Alloc(FX_BYTE, src_size); | |
if (pSrcBuf == NULL) { | |
return FALSE; | |
} | |
FXSYS_memcpy32(pSrcBuf, src_buf, src_size); | |
if (predictor == 2) { | |
TIFF_PredictorEncode(pSrcBuf, src_size, Colors, BitsPerComponent, Columns); | |
} else if (predictor >= 10) { | |
PNG_PredictorEncode(pSrcBuf, src_size, predictor, Colors, BitsPerComponent, Columns); | |
} | |
ret = Encode(pSrcBuf, src_size, dest_buf, dest_size); | |
FX_Free(pSrcBuf); | |
return ret; | |
} | |
FX_BOOL CCodec_FlateModule::Encode(FX_LPCBYTE src_buf, FX_DWORD src_size, FX_LPBYTE& dest_buf, FX_DWORD& dest_size) | |
{ | |
dest_size = src_size + src_size / 1000 + 12; | |
dest_buf = FX_Alloc( FX_BYTE, dest_size); | |
if (dest_buf == NULL) { | |
return FALSE; | |
} | |
unsigned long temp_size = dest_size; | |
FPDFAPI_FlateCompress(dest_buf, &temp_size, src_buf, src_size); | |
dest_size = (FX_DWORD)temp_size; | |
return TRUE; | |
} |