| // 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 "../../../../third_party/base/nonstd_unique_ptr.h" |
| #include "../../../include/fxcodec/fx_codec.h" |
| #include "../../fx_zlib.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: |
| 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 FX_BOOL PNG_PredictorEncode(FX_LPBYTE& data_buf, FX_DWORD& data_size, |
| int predictor, int Colors, |
| int BitsPerComponent, int Columns) |
| { |
| const int BytesPerPixel = (Colors * BitsPerComponent + 7) / 8; |
| const int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; |
| if (row_size <= 0) |
| return FALSE; |
| const int row_count = (data_size + row_size - 1) / row_size; |
| const 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 FALSE; |
| 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); |
| return TRUE; |
| } |
| 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 FX_BOOL PNG_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, |
| int Colors, int BitsPerComponent, int Columns) |
| { |
| const int BytesPerPixel = (Colors * BitsPerComponent + 7) / 8; |
| const int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; |
| if (row_size <= 0) |
| return FALSE; |
| const int row_count = (data_size + row_size) / (row_size + 1); |
| const 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 FALSE; |
| 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]; |
| byte_cnt++; |
| 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; |
| 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; |
| } |
| 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); |
| return TRUE; |
| } |
| 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 FX_BOOL TIFF_PredictorEncode(FX_LPBYTE& data_buf, FX_DWORD& data_size, |
| int Colors, int BitsPerComponent, int Columns) |
| { |
| int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; |
| if (row_size == 0) |
| return FALSE; |
| const int row_count = (data_size + row_size - 1) / row_size; |
| const 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); |
| } |
| return TRUE; |
| } |
| static void TIFF_PredictLine(FX_LPBYTE dest_buf, int row_size, int BitsPerComponent, int Colors, int Columns) |
| { |
| if (BitsPerComponent == 1) { |
| int row_bits = FX_MIN(BitsPerComponent * Colors * Columns, row_size * 8); |
| int index_pre = 0; |
| int col_pre = 0; |
| for(int i = 1; i < row_bits; i ++) { |
| int col = i % 8; |
| int index = i / 8; |
| if( ((dest_buf[index] >> (7 - col)) & 1) ^ ((dest_buf[index_pre] >> (7 - col_pre)) & 1) ) { |
| dest_buf[index] |= 1 << (7 - col); |
| } else { |
| dest_buf[index] &= ~(1 << (7 - col)); |
| } |
| index_pre = index; |
| col_pre = 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 FX_BOOL TIFF_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, |
| int Colors, int BitsPerComponent, int Columns) |
| { |
| int row_size = (Colors * BitsPerComponent * Columns + 7) / 8; |
| if (row_size == 0) |
| return FALSE; |
| const int row_count = (data_size + row_size - 1) / row_size; |
| const 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); |
| } |
| return TRUE; |
| } |
| 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; |
| } |
| 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 = new CCodec_FlateScanlineDecoder; |
| 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) |
| { |
| 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) { |
| { |
| nonstd::unique_ptr<CLZWDecoder> decoder(new CLZWDecoder); |
| dest_size = (FX_DWORD) - 1; |
| offset = src_size; |
| int err = decoder->Decode(NULL, dest_size, src_buf, offset, |
| bEarlyChange); |
| if (err || dest_size == 0 || dest_size + 1 < dest_size) { |
| return -1; |
| } |
| } |
| { |
| nonstd::unique_ptr<CLZWDecoder> decoder(new CLZWDecoder); |
| dest_buf = FX_Alloc( FX_BYTE, dest_size + 1); |
| if (dest_buf == NULL) { |
| return -1; |
| } |
| dest_buf[dest_size] = '\0'; |
| decoder->Decode(dest_buf, dest_size, src_buf, offset, bEarlyChange); |
| } |
| } else { |
| FlateUncompress(src_buf, src_size, estimated_size, dest_buf, dest_size, offset); |
| } |
| if (predictor_type == 0) { |
| return offset; |
| } |
| FX_BOOL ret = TRUE; |
| if (predictor_type == 2) { |
| ret = PNG_Predictor(dest_buf, dest_size, Colors, BitsPerComponent, |
| Columns); |
| } else if (predictor_type == 1) { |
| ret = TIFF_Predictor(dest_buf, dest_size, Colors, BitsPerComponent, |
| Columns); |
| } |
| return ret ? offset : -1; |
| } |
| 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_LPBYTE pSrcBuf = NULL; |
| pSrcBuf = FX_Alloc(FX_BYTE, src_size); |
| if (pSrcBuf == NULL) { |
| return FALSE; |
| } |
| FXSYS_memcpy32(pSrcBuf, src_buf, src_size); |
| FX_BOOL ret = TRUE; |
| if (predictor == 2) { |
| ret = TIFF_PredictorEncode(pSrcBuf, src_size, Colors, BitsPerComponent, |
| Columns); |
| } else if (predictor >= 10) { |
| ret = PNG_PredictorEncode(pSrcBuf, src_size, predictor, Colors, |
| BitsPerComponent, Columns); |
| } |
| if (ret) |
| 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; |
| } |
