diff options
Diffstat (limited to 'core/src/fxcodec/codec/fx_codec_flate.cpp')
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_flate.cpp | 1007 |
1 files changed, 0 insertions, 1007 deletions
diff --git a/core/src/fxcodec/codec/fx_codec_flate.cpp b/core/src/fxcodec/codec/fx_codec_flate.cpp deleted file mode 100644 index faffebda28..0000000000 --- a/core/src/fxcodec/codec/fx_codec_flate.cpp +++ /dev/null @@ -1,1007 +0,0 @@ -// 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/src/fxcodec/codec/codec_int.h" - -#include <algorithm> -#include <memory> - -#include "core/include/fxcodec/fx_codec.h" -#include "core/include/fxcodec/fx_codec_flate.h" -#include "third_party/zlib_v128/zlib.h" - -extern "C" { -static void* my_alloc_func(void* opaque, - unsigned int items, - unsigned int size) { - return FX_Alloc2D(uint8_t, items, size); -} -static void my_free_func(void* opaque, void* address) { - FX_Free(address); -} -static int FPDFAPI_FlateGetTotalOut(void* context) { - return ((z_stream*)context)->total_out; -} -static int FPDFAPI_FlateGetTotalIn(void* context) { - return ((z_stream*)context)->total_in; -} -static 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); -} -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) { - return NULL; - } - FXSYS_memset(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_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_memset(dest_buf + written, '\0', dest_size - written); - } - return ret; -} -int FPDFAPI_FlateGetAvailIn(void* context) { - return ((z_stream*)context)->avail_in; -} -int FPDFAPI_FlateGetAvailOut(void* context) { - return ((z_stream*)context)->avail_out; -} -void FPDFAPI_FlateEnd(void* context) { - inflateEnd((z_stream*)context); - ((z_stream*)context)->zfree(0, context); -} -} // extern "C" - -namespace { - -class CLZWDecoder { - public: - int Decode(uint8_t* output, - FX_DWORD& outlen, - const uint8_t* input, - FX_DWORD& size, - FX_BOOL bEarlyChange); - - private: - void AddCode(FX_DWORD prefix_code, uint8_t append_char); - void DecodeString(FX_DWORD code); - - FX_DWORD m_InPos; - FX_DWORD m_OutPos; - uint8_t* m_pOutput; - const uint8_t* m_pInput; - FX_BOOL m_Early; - FX_DWORD m_CodeArray[5021]; - FX_DWORD m_nCodes; - uint8_t m_DecodeStack[4000]; - FX_DWORD m_StackLen; - int m_CodeLen; -}; -void CLZWDecoder::AddCode(FX_DWORD prefix_code, uint8_t 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++] = (uint8_t)data; - code = data >> 16; - } - if (m_StackLen >= sizeof(m_DecodeStack)) { - return; - } - m_DecodeStack[m_StackLen++] = (uint8_t)code; -} -int CLZWDecoder::Decode(uint8_t* dest_buf, - FX_DWORD& dest_size, - const uint8_t* 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; - uint8_t 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] = (uint8_t)code; - } - m_OutPos++; - last_char = (uint8_t)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; -} - -uint8_t 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 (uint8_t)a; - } - if (pb <= pc) { - return (uint8_t)b; - } - return (uint8_t)c; -} - -FX_BOOL PNG_PredictorEncode(uint8_t*& 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; - uint8_t* dest_buf = FX_Alloc2D(uint8_t, row_size + 1, row_count); - int byte_cnt = 0; - uint8_t* pSrcData = data_buf; - uint8_t* 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_memmove(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; - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pSrcData[byte - BytesPerPixel]; - } - pDestData[byte + 1] = pSrcData[byte] - left; - } break; - case 12: { - pDestData[0] = 2; - uint8_t up = 0; - if (row) { - up = pSrcData[byte - row_size]; - } - pDestData[byte + 1] = pSrcData[byte] - up; - } break; - case 13: { - pDestData[0] = 3; - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pSrcData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (row) { - up = pSrcData[byte - row_size]; - } - pDestData[byte + 1] = pSrcData[byte] - (left + up) / 2; - } break; - case 14: { - pDestData[0] = 4; - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pSrcData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (row) { - up = pSrcData[byte - row_size]; - } - uint8_t 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; -} - -void PNG_PredictLine(uint8_t* pDestData, - const uint8_t* pSrcData, - const uint8_t* pLastLine, - int bpc, - int nColors, - int nPixels) { - int row_size = (nPixels * bpc * nColors + 7) / 8; - int BytesPerPixel = (bpc * nColors + 7) / 8; - uint8_t tag = pSrcData[0]; - if (tag == 0) { - FXSYS_memmove(pDestData, pSrcData + 1, row_size); - return; - } - for (int byte = 0; byte < row_size; byte++) { - uint8_t raw_byte = pSrcData[byte + 1]; - switch (tag) { - case 1: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - pDestData[byte] = raw_byte + left; - break; - } - case 2: { - uint8_t up = 0; - if (pLastLine) { - up = pLastLine[byte]; - } - pDestData[byte] = raw_byte + up; - break; - } - case 3: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (pLastLine) { - up = pLastLine[byte]; - } - pDestData[byte] = raw_byte + (up + left) / 2; - break; - } - case 4: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (pLastLine) { - up = pLastLine[byte]; - } - uint8_t 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; - } - } -} - -FX_BOOL PNG_Predictor(uint8_t*& 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); - if (row_count <= 0) - return FALSE; - const int last_row_size = data_size % (row_size + 1); - uint8_t* dest_buf = FX_Alloc2D(uint8_t, row_size, row_count); - int byte_cnt = 0; - uint8_t* pSrcData = data_buf; - uint8_t* pDestData = dest_buf; - for (int row = 0; row < row_count; row++) { - uint8_t 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_memmove(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++) { - uint8_t raw_byte = pSrcData[byte + 1]; - switch (tag) { - case 1: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - pDestData[byte] = raw_byte + left; - break; - } - case 2: { - uint8_t up = 0; - if (row) { - up = pDestData[byte - row_size]; - } - pDestData[byte] = raw_byte + up; - break; - } - case 3: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (row) { - up = pDestData[byte - row_size]; - } - pDestData[byte] = raw_byte + (up + left) / 2; - break; - } - case 4: { - uint8_t left = 0; - if (byte >= BytesPerPixel) { - left = pDestData[byte - BytesPerPixel]; - } - uint8_t up = 0; - if (row) { - up = pDestData[byte - row_size]; - } - uint8_t 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; -} - -void TIFF_PredictorEncodeLine(uint8_t* dest_buf, - int row_size, - int BitsPerComponent, - int Colors, - int Columns) { - int BytesPerPixel = BitsPerComponent * Colors / 8; - if (BitsPerComponent < 8) { - uint8_t 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; - uint8_t cur = (dest_buf[index] >> (8 - col - BitsPerComponent)) & mask; - uint8_t 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] = (uint8_t)pixel; - } - } -} - -FX_BOOL TIFF_PredictorEncode(uint8_t*& 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++) { - uint8_t* 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; -} - -void TIFF_PredictLine(uint8_t* dest_buf, - FX_DWORD row_size, - int BitsPerComponent, - int Colors, - int Columns) { - if (BitsPerComponent == 1) { - int row_bits = std::min(BitsPerComponent * Colors * Columns, - pdfium::base::checked_cast<int>(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 (FX_DWORD 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] = (uint8_t)pixel; - } - } else { - for (FX_DWORD i = BytesPerPixel; i < row_size; i++) { - dest_buf[i] += dest_buf[i - BytesPerPixel]; - } - } -} - -FX_BOOL TIFF_Predictor(uint8_t*& 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++) { - uint8_t* 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; -} - -void FlateUncompress(const uint8_t* src_buf, - FX_DWORD src_size, - FX_DWORD orig_size, - uint8_t*& dest_buf, - FX_DWORD& dest_size, - FX_DWORD& offset) { - FX_DWORD guess_size = orig_size ? orig_size : src_size * 2; - const FX_DWORD kStepSize = 10240; - FX_DWORD alloc_step = orig_size ? kStepSize : std::min(src_size, kStepSize); - static const FX_DWORD kMaxInitialAllocSize = 10000000; - if (guess_size > kMaxInitialAllocSize) { - guess_size = kMaxInitialAllocSize; - alloc_step = kMaxInitialAllocSize; - } - FX_DWORD buf_size = guess_size; - FX_DWORD last_buf_size = buf_size; - - dest_buf = nullptr; - dest_size = 0; - void* context = FPDFAPI_FlateInit(my_alloc_func, my_free_func); - if (!context) - return; - - std::unique_ptr<uint8_t, FxFreeDeleter> guess_buf( - FX_Alloc(uint8_t, guess_size + 1)); - guess_buf.get()[guess_size] = '\0'; - - FPDFAPI_FlateInput(context, src_buf, src_size); - - if (src_size < kStepSize) { - // This is the old implementation. - uint8_t* cur_buf = guess_buf.get(); - while (1) { - int32_t ret = FPDFAPI_FlateOutput(context, cur_buf, buf_size); - if (ret != Z_OK) - break; - int32_t avail_buf_size = FPDFAPI_FlateGetAvailOut(context); - if (avail_buf_size != 0) - break; - - FX_DWORD old_size = guess_size; - guess_size += alloc_step; - if (guess_size < old_size || guess_size + 1 < guess_size) { - FPDFAPI_FlateEnd(context); - return; - } - - { - uint8_t* new_buf = - FX_Realloc(uint8_t, guess_buf.release(), guess_size + 1); - guess_buf.reset(new_buf); - } - guess_buf.get()[guess_size] = '\0'; - cur_buf = guess_buf.get() + old_size; - buf_size = guess_size - old_size; - } - dest_size = FPDFAPI_FlateGetTotalOut(context); - offset = FPDFAPI_FlateGetTotalIn(context); - if (guess_size / 2 > dest_size) { - { - uint8_t* new_buf = - FX_Realloc(uint8_t, guess_buf.release(), dest_size + 1); - guess_buf.reset(new_buf); - } - guess_size = dest_size; - guess_buf.get()[guess_size] = '\0'; - } - dest_buf = guess_buf.release(); - } else { - CFX_ArrayTemplate<uint8_t*> result_tmp_bufs; - uint8_t* cur_buf = guess_buf.release(); - while (1) { - int32_t ret = FPDFAPI_FlateOutput(context, cur_buf, buf_size); - int32_t avail_buf_size = FPDFAPI_FlateGetAvailOut(context); - if (ret != Z_OK) { - last_buf_size = buf_size - avail_buf_size; - result_tmp_bufs.Add(cur_buf); - break; - } - if (avail_buf_size != 0) { - last_buf_size = buf_size - avail_buf_size; - result_tmp_bufs.Add(cur_buf); - break; - } - - result_tmp_bufs.Add(cur_buf); - cur_buf = FX_Alloc(uint8_t, buf_size + 1); - cur_buf[buf_size] = '\0'; - } - dest_size = FPDFAPI_FlateGetTotalOut(context); - offset = FPDFAPI_FlateGetTotalIn(context); - if (result_tmp_bufs.GetSize() == 1) { - dest_buf = result_tmp_bufs[0]; - } else { - uint8_t* result_buf = FX_Alloc(uint8_t, dest_size); - FX_DWORD result_pos = 0; - for (int32_t i = 0; i < result_tmp_bufs.GetSize(); i++) { - uint8_t* 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_memcpy(result_buf + result_pos, tmp_buf, tmp_buf_size); - result_pos += tmp_buf_size; - FX_Free(result_tmp_bufs[i]); - } - dest_buf = result_buf; - } - } - FPDFAPI_FlateEnd(context); -} - -} // namespace - -class CCodec_FlateScanlineDecoder : public CCodec_ScanlineDecoder { - public: - CCodec_FlateScanlineDecoder(); - ~CCodec_FlateScanlineDecoder() override; - - void Create(const uint8_t* src_buf, - FX_DWORD src_size, - int width, - int height, - int nComps, - int bpc, - int predictor, - int Colors, - int BitsPerComponent, - int Columns); - void Destroy() { delete this; } - - // CCodec_ScanlineDecoder - void v_DownScale(int dest_width, int dest_height) override {} - FX_BOOL v_Rewind() override; - uint8_t* v_GetNextLine() override; - FX_DWORD GetSrcOffset() override; - - void* m_pFlate; - const uint8_t* m_SrcBuf; - FX_DWORD m_SrcSize; - uint8_t* m_pScanline; - uint8_t* m_pLastLine; - uint8_t* m_pPredictBuffer; - uint8_t* m_pPredictRaw; - int m_Predictor; - int m_Colors; - int m_BitsPerComponent; - int m_Columns; - FX_DWORD m_PredictPitch; - size_t 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() { - FX_Free(m_pScanline); - FX_Free(m_pLastLine); - FX_Free(m_pPredictBuffer); - FX_Free(m_pPredictRaw); - if (m_pFlate) { - FPDFAPI_FlateEnd(m_pFlate); - } -} -void CCodec_FlateScanlineDecoder::Create(const uint8_t* 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 = (static_cast<FX_DWORD>(width) * nComps * bpc + 7) / 8; - m_pScanline = FX_Alloc(uint8_t, m_Pitch); - 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 = - (static_cast<FX_DWORD>(m_BitsPerComponent) * m_Colors * m_Columns + - 7) / - 8; - m_pLastLine = FX_Alloc(uint8_t, m_PredictPitch); - m_pPredictRaw = FX_Alloc(uint8_t, m_PredictPitch + 1); - m_pPredictBuffer = FX_Alloc(uint8_t, m_PredictPitch); - } - } -} -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) { - return FALSE; - } - FPDFAPI_FlateInput(m_pFlate, m_SrcBuf, m_SrcSize); - m_LeftOver = 0; - return TRUE; -} -uint8_t* 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_memcpy(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 { - size_t bytes_to_go = m_Pitch; - size_t read_leftover = - m_LeftOver > bytes_to_go ? bytes_to_go : m_LeftOver; - if (read_leftover) { - FXSYS_memcpy(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_memcpy(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); - } - size_t read_bytes = - m_PredictPitch > bytes_to_go ? bytes_to_go : m_PredictPitch; - FXSYS_memcpy(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); -} - -ICodec_ScanlineDecoder* CCodec_FlateModule::CreateDecoder( - const uint8_t* 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 uint8_t* src_buf, - FX_DWORD src_size, - FX_BOOL bEarlyChange, - int predictor, - int Colors, - int BitsPerComponent, - int Columns, - FX_DWORD estimated_size, - uint8_t*& 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) { - { - std::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; - } - } - { - std::unique_ptr<CLZWDecoder> decoder(new CLZWDecoder); - dest_buf = FX_Alloc(uint8_t, dest_size + 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 uint8_t* src_buf, - FX_DWORD src_size, - int predictor, - int Colors, - int BitsPerComponent, - int Columns, - uint8_t*& dest_buf, - FX_DWORD& dest_size) { - if (predictor != 2 && predictor < 10) { - return Encode(src_buf, src_size, dest_buf, dest_size); - } - uint8_t* pSrcBuf = NULL; - pSrcBuf = FX_Alloc(uint8_t, src_size); - FXSYS_memcpy(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(const uint8_t* src_buf, - FX_DWORD src_size, - uint8_t*& dest_buf, - FX_DWORD& dest_size) { - dest_size = src_size + src_size / 1000 + 12; - dest_buf = FX_Alloc(uint8_t, dest_size); - unsigned long temp_size = dest_size; - FPDFAPI_FlateCompress(dest_buf, &temp_size, src_buf, src_size); - dest_size = (FX_DWORD)temp_size; - return TRUE; -} |