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// 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 "codec_int.h"
#include "core/include/fxcodec/fx_codec.h"
// Holds per-document JBig2 related data.
class JBig2DocumentContext : public CFX_DestructObject {
public:
std::list<CJBig2_CachePair>* GetSymbolDictCache() {
return &m_SymbolDictCache;
}
~JBig2DocumentContext() override {
for (auto it : m_SymbolDictCache) {
delete it.second;
}
}
private:
std::list<CJBig2_CachePair> m_SymbolDictCache;
};
JBig2DocumentContext* GetJBig2DocumentContext(CCodec_Jbig2Module* pModule,
CFX_PrivateData* pPrivateData) {
void* pModulePrivateData = pPrivateData->GetPrivateData(pModule);
if (pModulePrivateData) {
CFX_DestructObject* pDestructObject =
reinterpret_cast<CFX_DestructObject*>(pModulePrivateData);
return static_cast<JBig2DocumentContext*>(pDestructObject);
}
JBig2DocumentContext* pJBig2DocumentContext = new JBig2DocumentContext();
pPrivateData->SetPrivateObj(pModule, pJBig2DocumentContext);
return pJBig2DocumentContext;
}
CCodec_Jbig2Context::CCodec_Jbig2Context() {
FXSYS_memset(this, 0, sizeof(CCodec_Jbig2Context));
}
CCodec_Jbig2Module::~CCodec_Jbig2Module() {
}
void* CCodec_Jbig2Module::CreateJbig2Context() {
return new CCodec_Jbig2Context();
}
void CCodec_Jbig2Module::DestroyJbig2Context(void* pJbig2Content) {
if (pJbig2Content) {
CJBig2_Context::DestroyContext(
((CCodec_Jbig2Context*)pJbig2Content)->m_pContext);
delete (CCodec_Jbig2Context*)pJbig2Content;
}
pJbig2Content = NULL;
}
FXCODEC_STATUS CCodec_Jbig2Module::StartDecode(void* pJbig2Context,
CFX_PrivateData* pPrivateData,
FX_DWORD width,
FX_DWORD height,
CPDF_StreamAcc* src_stream,
CPDF_StreamAcc* global_stream,
uint8_t* dest_buf,
FX_DWORD dest_pitch,
IFX_Pause* pPause) {
if (!pJbig2Context) {
return FXCODEC_STATUS_ERR_PARAMS;
}
JBig2DocumentContext* pJBig2DocumentContext =
GetJBig2DocumentContext(this, pPrivateData);
CCodec_Jbig2Context* m_pJbig2Context = (CCodec_Jbig2Context*)pJbig2Context;
m_pJbig2Context->m_width = width;
m_pJbig2Context->m_height = height;
m_pJbig2Context->m_pSrcStream = src_stream;
m_pJbig2Context->m_pGlobalStream = global_stream;
m_pJbig2Context->m_dest_buf = dest_buf;
m_pJbig2Context->m_dest_pitch = dest_pitch;
m_pJbig2Context->m_pPause = pPause;
FXSYS_memset(dest_buf, 0, height * dest_pitch);
m_pJbig2Context->m_pContext = CJBig2_Context::CreateContext(
global_stream, src_stream, pJBig2DocumentContext->GetSymbolDictCache(),
pPause);
if (!m_pJbig2Context->m_pContext) {
return FXCODEC_STATUS_ERROR;
}
int ret = m_pJbig2Context->m_pContext->getFirstPage(dest_buf, width, height,
dest_pitch, pPause);
if (m_pJbig2Context->m_pContext->GetProcessingStatus() ==
FXCODEC_STATUS_DECODE_FINISH) {
CJBig2_Context::DestroyContext(m_pJbig2Context->m_pContext);
m_pJbig2Context->m_pContext = NULL;
if (ret != JBIG2_SUCCESS) {
return FXCODEC_STATUS_ERROR;
}
int dword_size = height * dest_pitch / 4;
FX_DWORD* dword_buf = (FX_DWORD*)dest_buf;
for (int i = 0; i < dword_size; i++) {
dword_buf[i] = ~dword_buf[i];
}
return FXCODEC_STATUS_DECODE_FINISH;
}
return m_pJbig2Context->m_pContext->GetProcessingStatus();
}
FXCODEC_STATUS CCodec_Jbig2Module::ContinueDecode(void* pJbig2Context,
IFX_Pause* pPause) {
CCodec_Jbig2Context* m_pJbig2Context = (CCodec_Jbig2Context*)pJbig2Context;
int ret = m_pJbig2Context->m_pContext->Continue(pPause);
if (m_pJbig2Context->m_pContext->GetProcessingStatus() !=
FXCODEC_STATUS_DECODE_FINISH) {
return m_pJbig2Context->m_pContext->GetProcessingStatus();
}
CJBig2_Context::DestroyContext(m_pJbig2Context->m_pContext);
m_pJbig2Context->m_pContext = NULL;
if (ret != JBIG2_SUCCESS) {
return FXCODEC_STATUS_ERROR;
}
int dword_size =
m_pJbig2Context->m_height * m_pJbig2Context->m_dest_pitch / 4;
FX_DWORD* dword_buf = (FX_DWORD*)m_pJbig2Context->m_dest_buf;
for (int i = 0; i < dword_size; i++) {
dword_buf[i] = ~dword_buf[i];
}
return FXCODEC_STATUS_DECODE_FINISH;
}
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