Split CPDF_Stream/CPDF_StreamAcc into separate files

core/src/fpdfapi/fpdf_parser/cpdf_stream_acc.cpp

+// Copyright 2016 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/include/fpdfapi/cpdf_stream_acc.h"
+
+#include "core/include/fpdfapi/cpdf_dictionary.h"
+#include "core/include/fpdfapi/fpdf_parser_decode.h"
+
+CPDF_StreamAcc::CPDF_StreamAcc()
+    : m_pData(nullptr),
+      m_dwSize(0),
+      m_bNewBuf(FALSE),
+      m_pImageParam(nullptr),
+      m_pStream(nullptr),
+      m_pSrcData(nullptr) {}
+
+void CPDF_StreamAcc::LoadAllData(const CPDF_Stream* pStream,
+                                 FX_BOOL bRawAccess,
+                                 FX_DWORD estimated_size,
+                                 FX_BOOL bImageAcc) {
+  if (!pStream)
+    return;
+
+  m_pStream = pStream;
+  if (pStream->IsMemoryBased() &&
+      (!pStream->GetDict()->KeyExist("Filter") || bRawAccess)) {
+    m_dwSize = pStream->GetRawSize();
+    m_pData = pStream->GetRawData();
+    return;
+  }
+  uint8_t* pSrcData;
+  FX_DWORD dwSrcSize = pStream->GetRawSize();
+  if (dwSrcSize == 0)
+    return;
+
+  if (!pStream->IsMemoryBased()) {
+    pSrcData = m_pSrcData = FX_Alloc(uint8_t, dwSrcSize);
+    if (!pStream->ReadRawData(0, pSrcData, dwSrcSize))
+      return;
+  } else {
+    pSrcData = pStream->GetRawData();
+  }
+  uint8_t* pDecryptedData = pSrcData;
+  FX_DWORD dwDecryptedSize = dwSrcSize;
+  if (!pStream->GetDict()->KeyExist("Filter") || bRawAccess) {
+    m_pData = pDecryptedData;
+    m_dwSize = dwDecryptedSize;
+  } else {
+    FX_BOOL bRet = PDF_DataDecode(
+        pDecryptedData, dwDecryptedSize, m_pStream->GetDict(), m_pData,
+        m_dwSize, m_ImageDecoder, m_pImageParam, estimated_size, bImageAcc);
+    if (!bRet) {
+      m_pData = pDecryptedData;
+      m_dwSize = dwDecryptedSize;
+    }
+  }
+  if (pSrcData != pStream->GetRawData() && pSrcData != m_pData) {
+    FX_Free(pSrcData);
+  }
+  if (pDecryptedData != pSrcData && pDecryptedData != m_pData) {
+    FX_Free(pDecryptedData);
+  }
+  m_pSrcData = nullptr;
+  m_bNewBuf = m_pData != pStream->GetRawData();
+}
+
+CPDF_StreamAcc::~CPDF_StreamAcc() {
+  if (m_bNewBuf) {
+    FX_Free(m_pData);
+  }
+  FX_Free(m_pSrcData);
+}
+
+const uint8_t* CPDF_StreamAcc::GetData() const {
+  if (m_bNewBuf) {
+    return m_pData;
+  }
+  if (!m_pStream) {
+    return nullptr;
+  }
+  return m_pStream->GetRawData();
+}
+
+FX_DWORD CPDF_StreamAcc::GetSize() const {
+  if (m_bNewBuf) {
+    return m_dwSize;
+  }
+  if (!m_pStream) {
+    return 0;
+  }
+  return m_pStream->GetRawSize();
+}
+
+uint8_t* CPDF_StreamAcc::DetachData() {
+  if (m_bNewBuf) {
+    uint8_t* p = m_pData;
+    m_pData = nullptr;
+    m_dwSize = 0;
+    return p;
+  }
+  uint8_t* p = FX_Alloc(uint8_t, m_dwSize);
+  FXSYS_memcpy(p, m_pData, m_dwSize);
+  return p;
+}