From 5110c4743751145c4ae1934cd1d83bc6c55bb43f Mon Sep 17 00:00:00 2001 From: John Abd-El-Malek Date: Sat, 17 May 2014 22:33:34 -0700 Subject: Initial commit. --- .../fpdfapi/fpdf_parser/fpdf_parser_filters.cpp | 909 +++++++++++++++++++++ 1 file changed, 909 insertions(+) create mode 100644 core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp (limited to 'core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp') diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp new file mode 100644 index 0000000000..76a79f69cb --- /dev/null +++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp @@ -0,0 +1,909 @@ +// 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/fpdfapi/fpdf_parser.h" +#include "../../../include/fxcodec/fx_codec.h" +#include "../../../include/fpdfapi/fpdf_module.h" +#include "filters_int.h" +CFX_DataFilter::CFX_DataFilter() +{ + m_bEOF = FALSE; + m_pDestFilter = NULL; + m_SrcPos = 0; +} +CFX_DataFilter::~CFX_DataFilter() +{ + if (m_pDestFilter) { + delete m_pDestFilter; + } +} +void CFX_DataFilter::SetDestFilter(CFX_DataFilter* pFilter) +{ + if (m_pDestFilter) { + m_pDestFilter->SetDestFilter(pFilter); + } else { + m_pDestFilter = pFilter; + } +} +void CFX_DataFilter::FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + if (m_bEOF) { + return; + } + m_SrcPos += src_size; + if (m_pDestFilter) { + CFX_BinaryBuf temp_buf; + temp_buf.EstimateSize(FPDF_FILTER_BUFFER_SIZE, FPDF_FILTER_BUFFER_SIZE); + v_FilterIn(src_buf, src_size, temp_buf); + m_pDestFilter->FilterIn(temp_buf.GetBuffer(), temp_buf.GetSize(), dest_buf); + } else { + v_FilterIn(src_buf, src_size, dest_buf); + } +} +void CFX_DataFilter::FilterFinish(CFX_BinaryBuf& dest_buf) +{ + if (m_pDestFilter) { + CFX_BinaryBuf temp_buf; + v_FilterFinish(temp_buf); + if (temp_buf.GetSize()) { + m_pDestFilter->FilterIn(temp_buf.GetBuffer(), temp_buf.GetSize(), dest_buf); + } + m_pDestFilter->FilterFinish(dest_buf); + } else { + v_FilterFinish(dest_buf); + } + m_bEOF = TRUE; +} +void CFX_DataFilter::ReportEOF(FX_DWORD left_input) +{ + if (m_bEOF) { + return; + } + m_bEOF = TRUE; + m_SrcPos -= left_input; +} +CFX_DataFilter* FPDF_CreateFilter(FX_BSTR name, const CPDF_Dictionary* pParam, int width, int height) +{ + FX_DWORD id = name.GetID(); + switch (id) { + case FXBSTR_ID('F', 'l', 'a', 't'): + case FXBSTR_ID('F', 'l', 0, 0): + case FXBSTR_ID('L', 'Z', 'W', 'D'): + case FXBSTR_ID('L', 'Z', 'W', 0): { + CFX_DataFilter* pFilter; + if (id == FXBSTR_ID('L', 'Z', 'W', 'D') || id == FXBSTR_ID('L', 'Z', 'W', 0)) { + pFilter = FX_NEW CPDF_LzwFilter(pParam->GetInteger("EarlyChange", 1)); + } else { + pFilter = FX_NEW CPDF_FlateFilter; + } + if (pParam->GetInteger("Predictor", 1) > 1) { + CFX_DataFilter* pPredictor = FX_NEW CPDF_PredictorFilter(pParam->GetInteger(FX_BSTRC("Predictor"), 1), + pParam->GetInteger(FX_BSTRC("Colors"), 1), pParam->GetInteger(FX_BSTRC("BitsPerComponent"), 8), + pParam->GetInteger(FX_BSTRC("Columns"), 1)); + pFilter->SetDestFilter(pPredictor); + } + return pFilter; + } + case FXBSTR_ID('A', 'S', 'C', 'I'): + if (name == "ASCIIHexDecode") { + return FX_NEW CPDF_AsciiHexFilter; + } + return FX_NEW CPDF_Ascii85Filter; + case FXBSTR_ID('A', 'H', 'x', 0): + return FX_NEW CPDF_AsciiHexFilter; + case FXBSTR_ID('A', '8', '5', 0): + return FX_NEW CPDF_Ascii85Filter; + case FXBSTR_ID('R', 'u', 'n', 'L'): + return FX_NEW CPDF_RunLenFilter; + case FXBSTR_ID('C', 'C', 'I', 'T'): { + int Encoding = 0; + int bEndOfLine = FALSE; + int bByteAlign = FALSE; + int bBlack = FALSE; + int nRows = 0; + int nColumns = 1728; + if (pParam) { + Encoding = pParam->GetInteger(FX_BSTRC("K")); + bEndOfLine = pParam->GetInteger(FX_BSTRC("EndOfLine")); + bByteAlign = pParam->GetInteger(FX_BSTRC("EncodedByteAlign")); + bBlack = pParam->GetInteger(FX_BSTRC("BlackIs1")); + nColumns = pParam->GetInteger(FX_BSTRC("Columns"), 1728); + nRows = pParam->GetInteger(FX_BSTRC("Rows")); + } + if (nColumns == 0) { + nColumns = width; + } + if (nRows == 0) { + nRows = height; + } + CPDF_FaxFilter* pFilter = FX_NEW CPDF_FaxFilter(); + pFilter->Initialize(Encoding, bEndOfLine, bByteAlign, bBlack, nRows, nColumns); + return pFilter; + } + case FXBSTR_ID('D', 'C', 'T', 'D'): + return FX_NEW CPDF_JpegFilter; + default: + return NULL; + } +} +CFX_DataFilter* _FPDF_CreateFilterFromDict(CPDF_Dictionary* pDict) +{ + CPDF_Object* pDecoder = pDict->GetElementValue("Filter"); + if (pDecoder == NULL) { + return NULL; + } + CFX_DataFilter* pFirstFilter = NULL; + int width = pDict->GetInteger(FX_BSTRC("Width")), height = pDict->GetInteger(FX_BSTRC("Height")); + CPDF_Object* pParams = pDict->GetElementValue("DecodeParms"); + if (pDecoder->GetType() == PDFOBJ_ARRAY) { + if (pParams && pParams->GetType() != PDFOBJ_ARRAY) { + pParams = NULL; + } + for (FX_DWORD i = 0; i < ((CPDF_Array*)pDecoder)->GetCount(); i ++) { + CFX_ByteString name = ((CPDF_Array*)pDecoder)->GetString(i); + CPDF_Dictionary* pParam = NULL; + if (pParams) { + pParam = ((CPDF_Array*)pParams)->GetDict(i); + } + CFX_DataFilter* pDestFilter = FPDF_CreateFilter(name, pParam, width, height); + if (pDestFilter) { + if (pFirstFilter == NULL) { + pFirstFilter = pDestFilter; + } else { + pFirstFilter->SetDestFilter(pDestFilter); + } + } + } + } else { + if (pParams && pParams->GetType() != PDFOBJ_DICTIONARY) { + pParams = NULL; + } + pFirstFilter = FPDF_CreateFilter(pDecoder->GetString(), (CPDF_Dictionary*)pParams, width, height); + } + return pFirstFilter; +} +CPDF_StreamFilter* CPDF_Stream::GetStreamFilter(FX_BOOL bRaw) const +{ + CFX_DataFilter* pFirstFilter = NULL; + if (m_pCryptoHandler) { + pFirstFilter = FX_NEW CPDF_DecryptFilter(m_pCryptoHandler, m_ObjNum, m_GenNum); + } + if (!bRaw) { + CFX_DataFilter* pFilter = _FPDF_CreateFilterFromDict(m_pDict); + if (pFilter) { + if (pFirstFilter == NULL) { + pFirstFilter = pFilter; + } else { + pFirstFilter->SetDestFilter(pFilter); + } + } + } + CPDF_StreamFilter* pStreamFilter = FX_NEW CPDF_StreamFilter; + pStreamFilter->m_pStream = this; + pStreamFilter->m_pFilter = pFirstFilter; + pStreamFilter->m_pBuffer = NULL; + pStreamFilter->m_SrcOffset = 0; + return pStreamFilter; +} +CPDF_StreamFilter::~CPDF_StreamFilter() +{ + if (m_pFilter) { + delete m_pFilter; + } + if (m_pBuffer) { + delete m_pBuffer; + } +} +#define FPDF_FILTER_BUFFER_IN_SIZE FPDF_FILTER_BUFFER_SIZE +FX_DWORD CPDF_StreamFilter::ReadBlock(FX_LPBYTE buffer, FX_DWORD buf_size) +{ + if (m_pFilter == NULL) { + FX_DWORD read_size = m_pStream->GetRawSize() - m_SrcOffset; + if (read_size == 0) { + return 0; + } + if (read_size > buf_size) { + read_size = buf_size; + } + m_pStream->ReadRawData(m_SrcOffset, buffer, read_size); + m_SrcOffset += read_size; + return read_size; + } + FX_DWORD read_size = 0; + if (m_pBuffer) { + read_size = ReadLeftOver(buffer, buf_size); + if (read_size == buf_size) { + return read_size; + } + buffer += read_size; + buf_size -= read_size; + } + ASSERT(m_pBuffer == NULL); + if (m_pFilter->IsEOF()) { + return read_size; + } + m_pBuffer = FX_NEW CFX_BinaryBuf; + m_pBuffer->EstimateSize(FPDF_FILTER_BUFFER_SIZE, FPDF_FILTER_BUFFER_SIZE); + m_BufOffset = 0; + while (1) { + int src_size = m_pStream->GetRawSize() - m_SrcOffset; + if (src_size == 0) { + m_pFilter->FilterFinish(*m_pBuffer); + break; + } + if (src_size > FPDF_FILTER_BUFFER_IN_SIZE) { + src_size = FPDF_FILTER_BUFFER_IN_SIZE; + } + if (!m_pStream->ReadRawData(m_SrcOffset, m_SrcBuffer, src_size)) { + return 0; + } + m_SrcOffset += src_size; + m_pFilter->FilterIn(m_SrcBuffer, src_size, *m_pBuffer); + if (m_pBuffer->GetSize() >= (int)buf_size) { + break; + } + } + return read_size + ReadLeftOver(buffer, buf_size); +} +FX_DWORD CPDF_StreamFilter::ReadLeftOver(FX_LPBYTE buffer, FX_DWORD buf_size) +{ + FX_DWORD read_size = m_pBuffer->GetSize() - m_BufOffset; + if (read_size > buf_size) { + read_size = buf_size; + } + FXSYS_memcpy32(buffer, m_pBuffer->GetBuffer() + m_BufOffset, read_size); + m_BufOffset += read_size; + if (m_BufOffset == (FX_DWORD)m_pBuffer->GetSize()) { + delete m_pBuffer; + m_pBuffer = NULL; + } + return read_size; +} +CPDF_DecryptFilter::CPDF_DecryptFilter(CPDF_CryptoHandler* pCryptoHandler, FX_DWORD objnum, FX_DWORD gennum) +{ + m_pCryptoHandler = pCryptoHandler; + m_pContext = NULL; + m_ObjNum = objnum; + m_GenNum = gennum; +} +CPDF_DecryptFilter::~CPDF_DecryptFilter() +{ + CFX_BinaryBuf buf; + if (m_pContext) { + m_pCryptoHandler->DecryptFinish(m_pContext, buf); + } +} +void CPDF_DecryptFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + if (m_pContext == NULL) { + m_pContext = m_pCryptoHandler->DecryptStart(m_ObjNum, m_GenNum); + } + m_pCryptoHandler->DecryptStream(m_pContext, src_buf, src_size, dest_buf); +} +void CPDF_DecryptFilter::v_FilterFinish(CFX_BinaryBuf& dest_buf) +{ + m_bEOF = TRUE; + if (m_pContext == NULL) { + return; + } + m_pCryptoHandler->DecryptFinish(m_pContext, dest_buf); + m_pContext = NULL; +} +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*)); + void FPDFAPI_FlateInput(void* context, const unsigned char* src_buf, unsigned int src_size); + int FPDFAPI_FlateOutput(void* context, unsigned char* dest_buf, unsigned int dest_size); + int FPDFAPI_FlateGetAvailIn(void* context); + int FPDFAPI_FlateGetAvailOut(void* context); + void FPDFAPI_FlateEnd(void* context); +} +CPDF_FlateFilter::CPDF_FlateFilter() +{ + m_pContext = NULL; +} +CPDF_FlateFilter::~CPDF_FlateFilter() +{ + if (m_pContext) { + FPDFAPI_FlateEnd(m_pContext); + } +} +void CPDF_FlateFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + if (m_pContext == NULL) { + m_pContext = FPDFAPI_FlateInit(my_alloc_func, my_free_func); + } + FPDFAPI_FlateInput(m_pContext, src_buf, src_size); + while (1) { + int ret = FPDFAPI_FlateOutput(m_pContext, m_DestBuffer, FPDF_FILTER_BUFFER_SIZE); + int out_size = FPDF_FILTER_BUFFER_SIZE - FPDFAPI_FlateGetAvailOut(m_pContext); + dest_buf.AppendBlock(m_DestBuffer, out_size); + if (ret == Z_BUF_ERROR) { + break; + } + if (ret != Z_OK) { + ReportEOF(FPDFAPI_FlateGetAvailIn(m_pContext)); + break; + } + } +} +CPDF_LzwFilter::CPDF_LzwFilter(FX_BOOL bEarlyChange) +{ + m_bEarlyChange = bEarlyChange ? 1 : 0; + m_CodeLen = 9; + m_nCodes = 0; + m_nLeftBits = 0; + m_LeftBits = 0; + m_OldCode = (FX_DWORD) - 1; +} +void CPDF_LzwFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + for (FX_DWORD i = 0; i < src_size; i ++) { + if (m_nLeftBits + 8 < m_CodeLen) { + m_nLeftBits += 8; + m_LeftBits = (m_LeftBits << 8) | src_buf[i]; + continue; + } + FX_DWORD new_bits = m_CodeLen - m_nLeftBits; + FX_DWORD code = (m_LeftBits << new_bits) | (src_buf[i] >> (8 - new_bits)); + m_nLeftBits = 8 - new_bits; + m_LeftBits = src_buf[i] % (1 << m_nLeftBits); + if (code < 256) { + dest_buf.AppendByte((FX_BYTE)code); + m_LastChar = (FX_BYTE)code; + if (m_OldCode != -1) { + AddCode(m_OldCode, m_LastChar); + } + m_OldCode = code; + } else if (code == 256) { + m_CodeLen = 9; + m_nCodes = 0; + m_OldCode = (FX_DWORD) - 1; + } else if (code == 257) { + ReportEOF(src_size - i - 1); + return; + } else { + if (m_OldCode == -1) { + ReportEOF(src_size - i - 1); + return; + } + m_StackLen = 0; + if (code >= m_nCodes + 258) { + if (m_StackLen < sizeof(m_DecodeStack)) { + m_DecodeStack[m_StackLen++] = m_LastChar; + } + DecodeString(m_OldCode); + } else { + DecodeString(code); + } + dest_buf.AppendBlock(NULL, m_StackLen); + FX_LPBYTE pOutput = dest_buf.GetBuffer() + dest_buf.GetSize() - m_StackLen; + for (FX_DWORD cc = 0; cc < m_StackLen; cc ++) { + pOutput[cc] = m_DecodeStack[m_StackLen - cc - 1]; + } + m_LastChar = m_DecodeStack[m_StackLen - 1]; + if (m_OldCode < 256) { + AddCode(m_OldCode, m_LastChar); + } else if (m_OldCode - 258 >= m_nCodes) { + ReportEOF(src_size - i - 1); + return; + } else { + AddCode(m_OldCode, m_LastChar); + } + m_OldCode = code; + } + } +} +void CPDF_LzwFilter::AddCode(FX_DWORD prefix_code, FX_BYTE append_char) +{ + if (m_nCodes + m_bEarlyChange == 4094) { + return; + } + m_CodeArray[m_nCodes ++] = (prefix_code << 16) | append_char; + if (m_nCodes + m_bEarlyChange == 512 - 258) { + m_CodeLen = 10; + } else if (m_nCodes + m_bEarlyChange == 1024 - 258) { + m_CodeLen = 11; + } else if (m_nCodes + m_bEarlyChange == 2048 - 258) { + m_CodeLen = 12; + } +} +void CPDF_LzwFilter::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; +} +CPDF_PredictorFilter::CPDF_PredictorFilter(int predictor, int colors, int bpc, int cols) +{ + m_bTiff = predictor < 10; + m_pRefLine = NULL; + m_pCurLine = NULL; + m_iLine = 0; + m_LineInSize = 0; + m_Bpp = (colors * bpc + 7) / 8; + m_Pitch = (colors * bpc * cols + 7) / 8; + if (!m_bTiff) { + m_Pitch ++; + } +} +CPDF_PredictorFilter::~CPDF_PredictorFilter() +{ + if (m_pCurLine) { + FX_Free(m_pCurLine); + } + if (m_pRefLine) { + FX_Free(m_pRefLine); + } +} +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_PredictorLine(FX_LPBYTE cur_buf, FX_LPBYTE ref_buf, int pitch, int Bpp) +{ + FX_BYTE tag = cur_buf[0]; + if (tag == 0) { + return; + } + cur_buf ++; + if (ref_buf) { + ref_buf ++; + } + for (int byte = 0; byte < pitch; byte ++) { + FX_BYTE raw_byte = cur_buf[byte]; + switch (tag) { + case 1: { + FX_BYTE left = 0; + if (byte >= Bpp) { + left = cur_buf[byte - Bpp]; + } + cur_buf[byte] = raw_byte + left; + break; + } + case 2: { + FX_BYTE up = 0; + if (ref_buf) { + up = ref_buf[byte]; + } + cur_buf[byte] = raw_byte + up; + break; + } + case 3: { + FX_BYTE left = 0; + if (byte >= Bpp) { + left = cur_buf[byte - Bpp]; + } + FX_BYTE up = 0; + if (ref_buf) { + up = ref_buf[byte]; + } + cur_buf[byte] = raw_byte + (up + left) / 2; + break; + } + case 4: { + FX_BYTE left = 0; + if (byte >= Bpp) { + left = cur_buf[byte - Bpp]; + } + FX_BYTE up = 0; + if (ref_buf) { + up = ref_buf[byte]; + } + FX_BYTE upper_left = 0; + if (byte >= Bpp && ref_buf) { + upper_left = ref_buf[byte - Bpp]; + } + cur_buf[byte] = raw_byte + PaethPredictor(left, up, upper_left); + break; + } + } + } +} +void CPDF_PredictorFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + if (m_pCurLine == NULL) { + m_pCurLine = FX_Alloc(FX_BYTE, m_Pitch); + if (!m_bTiff) { + m_pRefLine = FX_Alloc(FX_BYTE, m_Pitch); + } + } + while (1) { + FX_DWORD read_size = m_Pitch - m_LineInSize; + if (read_size > src_size) { + read_size = src_size; + } + FXSYS_memcpy32(m_pCurLine + m_LineInSize, src_buf, read_size); + m_LineInSize += read_size; + if (m_LineInSize < m_Pitch) { + break; + } + src_buf += read_size; + src_size -= read_size; + if (m_bTiff) { + for (FX_DWORD byte = m_Bpp; byte < m_Pitch; byte ++) { + m_pCurLine[byte] += m_pCurLine[byte - m_Bpp]; + } + dest_buf.AppendBlock(m_pCurLine, m_Pitch); + } else { + PNG_PredictorLine(m_pCurLine, m_iLine ? m_pRefLine : NULL, m_Pitch - 1, m_Bpp); + dest_buf.AppendBlock(m_pCurLine + 1, m_Pitch - 1); + m_iLine ++; + FX_LPBYTE temp = m_pCurLine; + m_pCurLine = m_pRefLine; + m_pRefLine = temp; + } + m_LineInSize = 0; + } +} +CPDF_Ascii85Filter::CPDF_Ascii85Filter() +{ + m_State = 0; + m_CharCount = 0; +} +extern const FX_LPCSTR _PDF_CharType; +void CPDF_Ascii85Filter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + for (FX_DWORD i = 0; i < src_size; i ++) { + FX_BYTE byte = src_buf[i]; + if (_PDF_CharType[byte] == 'W') { + continue; + } + switch (m_State) { + case 0: + if (byte >= '!' && byte <= 'u') { + int digit = byte - '!'; + m_CurDWord = digit; + m_CharCount = 1; + m_State = 1; + } else if (byte == 'z') { + int zero = 0; + dest_buf.AppendBlock(&zero, 4); + } else if (byte == '~') { + m_State = 2; + } + break; + case 1: { + if (byte >= '!' && byte <= 'u') { + int digit = byte - '!'; + m_CurDWord = m_CurDWord * 85 + digit; + m_CharCount ++; + if (m_CharCount == 5) { + for (int i = 0; i < 4; i ++) { + dest_buf.AppendByte((FX_BYTE)(m_CurDWord >> (3 - i) * 8)); + } + m_State = 0; + } + } else if (byte == '~') { + if (m_CharCount > 1) { + int i; + for (i = m_CharCount; i < 5; i ++) { + m_CurDWord = m_CurDWord * 85 + 84; + } + for (i = 0; i < m_CharCount - 1; i ++) { + dest_buf.AppendByte((FX_BYTE)(m_CurDWord >> (3 - i) * 8)); + } + } + m_State = 2; + } + break; + } + case 2: + if (byte == '>') { + ReportEOF(src_size - i - 1); + return; + } + break; + } + } +} +CPDF_AsciiHexFilter::CPDF_AsciiHexFilter() +{ + m_State = 0; +} +void CPDF_AsciiHexFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + for (FX_DWORD i = 0; i < src_size; i ++) { + FX_BYTE byte = src_buf[i]; + if (_PDF_CharType[byte] == 'W') { + continue; + } + int digit; + if (byte >= '0' && byte <= '9') { + digit = byte - '0'; + } else if (byte >= 'a' && byte <= 'f') { + digit = byte - 'a' + 10; + } else if (byte >= 'A' && byte <= 'F') { + digit = byte - 'A' + 10; + } else { + if (m_State) { + dest_buf.AppendByte(m_FirstDigit * 16); + } + ReportEOF(src_size - i - 1); + return; + } + if (m_State == 0) { + m_FirstDigit = digit; + m_State ++; + } else { + dest_buf.AppendByte(m_FirstDigit * 16 + digit); + m_State --; + } + } +} +CPDF_RunLenFilter::CPDF_RunLenFilter() +{ + m_State = 0; + m_Count = 0; +} +void CPDF_RunLenFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + for (FX_DWORD i = 0; i < src_size; i ++) { + FX_BYTE byte = src_buf[i]; + switch (m_State) { + case 0: + if (byte < 128) { + m_State = 1; + m_Count = byte + 1; + } else if (byte == 128) { + ReportEOF(src_size - i - 1); + return; + } else { + m_State = 2; + m_Count = 257 - byte; + } + break; + case 1: + dest_buf.AppendByte(byte); + m_Count --; + if (m_Count == 0) { + m_State = 0; + } + break; + case 2: { + dest_buf.AppendBlock(NULL, m_Count); + FXSYS_memset8(dest_buf.GetBuffer() + dest_buf.GetSize() - m_Count, byte, m_Count); + m_State = 0; + break; + } + } + } +} +CPDF_JpegFilter::CPDF_JpegFilter() +{ + m_pContext = NULL; + m_bGotHeader = FALSE; + m_pScanline = NULL; + m_iLine = 0; +} +CPDF_JpegFilter::~CPDF_JpegFilter() +{ + if (m_pScanline) { + FX_Free(m_pScanline); + } + if (m_pContext) { + CPDF_ModuleMgr::Get()->GetJpegModule()->Finish(m_pContext); + } +} +void CPDF_JpegFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + if (m_pContext == NULL) { + m_pContext = CPDF_ModuleMgr::Get()->GetJpegModule()->Start(); + } + FX_LPCBYTE jpeg_src_buf; + FX_DWORD jpeg_src_size; + CFX_BinaryBuf temp_buf; + if (m_InputBuf.GetSize()) { + temp_buf.EstimateSize(m_InputBuf.GetSize() + src_size); + temp_buf.AppendBlock(m_InputBuf.GetBuffer(), m_InputBuf.GetSize()); + m_InputBuf.Clear(); + temp_buf.AppendBlock(src_buf, src_size); + jpeg_src_buf = temp_buf.GetBuffer(); + jpeg_src_size = temp_buf.GetSize(); + } else { + jpeg_src_buf = src_buf; + jpeg_src_size = src_size; + } + CPDF_ModuleMgr::Get()->GetJpegModule()->Input(m_pContext, jpeg_src_buf, jpeg_src_size); + if (!m_bGotHeader) { + int ret = CPDF_ModuleMgr::Get()->GetJpegModule()->ReadHeader(m_pContext, &m_Width, &m_Height, &m_nComps); + int left_size = CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext); + if (ret == 1) { + ReportEOF(left_size); + return; + } + if (ret == 2) { + m_InputBuf.AppendBlock(jpeg_src_buf + jpeg_src_size - left_size, left_size); + return; + } + CPDF_ModuleMgr::Get()->GetJpegModule()->StartScanline(m_pContext, 1); + m_bGotHeader = TRUE; + m_Pitch = m_Width * m_nComps; + } + if (m_pScanline == NULL) { + m_pScanline = FX_Alloc(FX_BYTE, m_Pitch + 4); + } + while (1) { + if (!CPDF_ModuleMgr::Get()->GetJpegModule()->ReadScanline(m_pContext, m_pScanline)) { + int left_size = CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext); + m_InputBuf.AppendBlock(jpeg_src_buf + jpeg_src_size - left_size, left_size); + break; + } + dest_buf.AppendBlock(m_pScanline, m_Pitch); + m_iLine ++; + if (m_iLine == m_Height) { + ReportEOF(CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext)); + return; + } + } +} +CPDF_FaxFilter::CPDF_FaxFilter() +{ + m_Encoding = 0; + m_bEndOfLine = FALSE; + m_bByteAlign = FALSE; + m_bBlack = FALSE; + m_nRows = 0; + m_nColumns = 0; + m_Pitch = 0; + m_pScanlineBuf = NULL; + m_pRefBuf = NULL; + m_iRow = 0; + m_InputBitPos = 0; +} +CPDF_FaxFilter::~CPDF_FaxFilter() +{ + if (m_pScanlineBuf) { + FX_Free(m_pScanlineBuf); + } + if (m_pRefBuf) { + FX_Free(m_pRefBuf); + } +} +FX_BOOL CPDF_FaxFilter::Initialize(int Encoding, int bEndOfLine, int bByteAlign, int bBlack, int nRows, int nColumns) +{ + m_Encoding = Encoding; + m_bEndOfLine = bEndOfLine; + m_bByteAlign = bByteAlign; + m_bBlack = bBlack; + m_nRows = nRows; + m_nColumns = nColumns; + m_Pitch = (m_nColumns + 7) / 8; + m_pScanlineBuf = FX_Alloc(FX_BYTE, m_Pitch); + m_pRefBuf = FX_Alloc(FX_BYTE, m_Pitch); + FXSYS_memset8(m_pScanlineBuf, 0xff, m_Pitch); + FXSYS_memset8(m_pRefBuf, 0xff, m_Pitch); + m_iRow = 0; + m_InputBitPos = 0; + return TRUE; +} +void CPDF_FaxFilter::v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf) +{ + FX_LPCBYTE fax_src_buf; + FX_DWORD fax_src_size; + CFX_BinaryBuf temp_buf; + int bitpos; + if (m_InputBuf.GetSize()) { + temp_buf.EstimateSize(m_InputBuf.GetSize() + src_size); + temp_buf.AppendBlock(m_InputBuf.GetBuffer(), m_InputBuf.GetSize()); + m_InputBuf.Clear(); + temp_buf.AppendBlock(src_buf, src_size); + fax_src_buf = temp_buf.GetBuffer(); + fax_src_size = temp_buf.GetSize(); + bitpos = m_InputBitPos; + } else { + fax_src_buf = src_buf; + fax_src_size = src_size; + bitpos = 0; + } + ProcessData(fax_src_buf, fax_src_size, bitpos, FALSE, dest_buf); + int left_bits = fax_src_size * 8 - bitpos; + m_InputBuf.AppendBlock(fax_src_buf + bitpos / 8, (left_bits + 7) / 8); + m_InputBitPos = bitpos % 8; +} +void CPDF_FaxFilter::v_FilterFinish(CFX_BinaryBuf& dest_buf) +{ + ProcessData(m_InputBuf.GetBuffer(), m_InputBuf.GetSize(), m_InputBitPos, TRUE, dest_buf); +} +FX_BOOL _FaxSkipEOL(const FX_BYTE* src_buf, int bitsize, int& bitpos); +FX_BOOL _FaxG4GetRow(const FX_BYTE* src_buf, int bitsize, int& bitpos, FX_LPBYTE dest_buf, const FX_BYTE* ref_buf, int columns); +FX_BOOL _FaxGet1DLine(const FX_BYTE* src_buf, int bitsize, int& bitpos, FX_LPBYTE dest_buf, int columns); +void CPDF_FaxFilter::ProcessData(FX_LPCBYTE src_buf, FX_DWORD src_size, int& bitpos, FX_BOOL bFinish, + CFX_BinaryBuf& dest_buf) +{ + int bitsize = src_size * 8; + while (1) { + if ((bitsize < bitpos + 256) && !bFinish) { + return; + } + int start_bitpos = bitpos; + FXSYS_memset8(m_pScanlineBuf, 0xff, m_Pitch); + if (!ReadLine(src_buf, bitsize, bitpos)) { + bitpos = start_bitpos; + return; + } + if (m_Encoding) { + FXSYS_memcpy32(m_pRefBuf, m_pScanlineBuf, m_Pitch); + } + if (m_bBlack) { + for (int i = 0; i < m_Pitch; i ++) { + m_pScanlineBuf[i] = ~m_pScanlineBuf[i]; + } + } + dest_buf.AppendBlock(m_pScanlineBuf, m_Pitch); + m_iRow ++; + if (m_iRow == m_nRows) { + ReportEOF(src_size - (bitpos + 7) / 8); + return; + } + } +} +FX_BOOL CPDF_FaxFilter::ReadLine(FX_LPCBYTE src_buf, int bitsize, int& bitpos) +{ + if (!_FaxSkipEOL(src_buf, bitsize, bitpos)) { + return FALSE; + } + FX_BOOL ret; + if (m_Encoding < 0) { + ret = _FaxG4GetRow(src_buf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf, m_nColumns); + } else if (m_Encoding == 0) { + ret = _FaxGet1DLine(src_buf, bitsize, bitpos, m_pScanlineBuf, m_nColumns); + } else { + if (bitpos == bitsize) { + return FALSE; + } + FX_BOOL bNext1D = src_buf[bitpos / 8] & (1 << (7 - bitpos % 8)); + bitpos ++; + if (bNext1D) { + ret = _FaxGet1DLine(src_buf, bitsize, bitpos, m_pScanlineBuf, m_nColumns); + } else { + ret = _FaxG4GetRow(src_buf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf, m_nColumns); + } + } + if (!ret) { + return FALSE; + } + if (m_bEndOfLine) + if (!_FaxSkipEOL(src_buf, bitsize, bitpos)) { + return FALSE; + } + if (m_bByteAlign) { + bitpos = (bitpos + 7) / 8 * 8; + } + return TRUE; +} -- cgit v1.2.3