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authorDan Sinclair <dsinclair@chromium.org>2017-04-20 14:11:21 -0400
committerChromium commit bot <commit-bot@chromium.org>2017-04-20 18:38:55 +0000
commit283a0433b081f88275b2f7e8c04d3c41b9187ca6 (patch)
tree4f6ff921e8a7de9b7922369c97731e54f647ea33 /core/fxcrt/cfx_memorystream.cpp
parent03f5bab415cda066855e2672154358056649c584 (diff)
downloadpdfium-283a0433b081f88275b2f7e8c04d3c41b9187ca6.tar.xz
Convert IFX_MemoryStream to CFX_MemoryStream
The CFX_MemoryStream is the only implementation of IFX_MemoryStream. This CL removes the interfaces and uses CFX_MemoryStream directly. Change-Id: I2f43fa39e82dafa7673517d214ae15fd2d0df331 Reviewed-on: https://pdfium-review.googlesource.com/4391 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
Diffstat (limited to 'core/fxcrt/cfx_memorystream.cpp')
-rw-r--r--core/fxcrt/cfx_memorystream.cpp199
1 files changed, 199 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_memorystream.cpp b/core/fxcrt/cfx_memorystream.cpp
new file mode 100644
index 0000000000..345b381226
--- /dev/null
+++ b/core/fxcrt/cfx_memorystream.cpp
@@ -0,0 +1,199 @@
+// Copyright 2017 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/fxcrt/cfx_memorystream.h"
+
+#include <algorithm>
+
+#include "core/fxcrt/fx_safe_types.h"
+
+namespace {
+
+const int32_t kBlockSize = 64 * 1024;
+
+} // namespace
+
+CFX_MemoryStream::CFX_MemoryStream(bool bConsecutive)
+ : m_nTotalSize(0),
+ m_nCurSize(0),
+ m_nCurPos(0),
+ m_nGrowSize(kBlockSize),
+ m_dwFlags(Type::kTakeOver | (bConsecutive ? Type::kConsecutive : 0)) {}
+
+CFX_MemoryStream::CFX_MemoryStream(uint8_t* pBuffer,
+ size_t nSize,
+ bool bTakeOver)
+ : m_nTotalSize(nSize),
+ m_nCurSize(nSize),
+ m_nCurPos(0),
+ m_nGrowSize(kBlockSize),
+ m_dwFlags(Type::kConsecutive | (bTakeOver ? Type::kTakeOver : 0)) {
+ m_Blocks.push_back(pBuffer);
+}
+
+CFX_MemoryStream::~CFX_MemoryStream() {
+ if (m_dwFlags & Type::kTakeOver) {
+ for (uint8_t* pBlock : m_Blocks)
+ FX_Free(pBlock);
+ }
+}
+
+FX_FILESIZE CFX_MemoryStream::GetSize() {
+ return static_cast<FX_FILESIZE>(m_nCurSize);
+}
+
+bool CFX_MemoryStream::IsEOF() {
+ return m_nCurPos >= static_cast<size_t>(GetSize());
+}
+
+FX_FILESIZE CFX_MemoryStream::GetPosition() {
+ return static_cast<FX_FILESIZE>(m_nCurPos);
+}
+
+bool CFX_MemoryStream::Flush() {
+ return true;
+}
+
+bool CFX_MemoryStream::ReadBlock(void* buffer,
+ FX_FILESIZE offset,
+ size_t size) {
+ if (!buffer || !size || offset < 0)
+ return false;
+
+ FX_SAFE_SIZE_T newPos = size;
+ newPos += offset;
+ if (!newPos.IsValid() || newPos.ValueOrDefault(0) == 0 ||
+ newPos.ValueOrDie() > m_nCurSize) {
+ return false;
+ }
+
+ m_nCurPos = newPos.ValueOrDie();
+ if (m_dwFlags & Type::kConsecutive) {
+ memcpy(buffer, m_Blocks[0] + static_cast<size_t>(offset), size);
+ return true;
+ }
+
+ size_t nStartBlock = static_cast<size_t>(offset) / m_nGrowSize;
+ offset -= static_cast<FX_FILESIZE>(nStartBlock * m_nGrowSize);
+ while (size) {
+ size_t nRead = std::min(size, m_nGrowSize - static_cast<size_t>(offset));
+ memcpy(buffer, m_Blocks[nStartBlock] + offset, nRead);
+ buffer = static_cast<uint8_t*>(buffer) + nRead;
+ size -= nRead;
+ ++nStartBlock;
+ offset = 0;
+ }
+ return true;
+}
+
+size_t CFX_MemoryStream::ReadBlock(void* buffer, size_t size) {
+ if (m_nCurPos >= m_nCurSize)
+ return 0;
+
+ size_t nRead = std::min(size, m_nCurSize - m_nCurPos);
+ if (!ReadBlock(buffer, static_cast<int32_t>(m_nCurPos), nRead))
+ return 0;
+
+ return nRead;
+}
+
+bool CFX_MemoryStream::WriteBlock(const void* buffer,
+ FX_FILESIZE offset,
+ size_t size) {
+ if (!buffer || !size)
+ return false;
+
+ if (m_dwFlags & Type::kConsecutive) {
+ FX_SAFE_SIZE_T newPos = size;
+ newPos += offset;
+ if (!newPos.IsValid())
+ return false;
+
+ m_nCurPos = newPos.ValueOrDie();
+ if (m_nCurPos > m_nTotalSize) {
+ m_nTotalSize = (m_nCurPos + m_nGrowSize - 1) / m_nGrowSize * m_nGrowSize;
+ if (m_Blocks.empty())
+ m_Blocks.push_back(FX_Alloc(uint8_t, m_nTotalSize));
+ else
+ m_Blocks[0] = FX_Realloc(uint8_t, m_Blocks[0], m_nTotalSize);
+ }
+
+ memcpy(m_Blocks[0] + offset, buffer, size);
+ m_nCurSize = std::max(m_nCurSize, m_nCurPos);
+
+ return true;
+ }
+
+ FX_SAFE_SIZE_T newPos = size;
+ newPos += offset;
+ if (!newPos.IsValid())
+ return false;
+ if (!ExpandBlocks(newPos.ValueOrDie()))
+ return false;
+
+ m_nCurPos = newPos.ValueOrDie();
+ size_t nStartBlock = static_cast<size_t>(offset) / m_nGrowSize;
+ offset -= static_cast<FX_FILESIZE>(nStartBlock * m_nGrowSize);
+ while (size) {
+ size_t nWrite = std::min(size, m_nGrowSize - static_cast<size_t>(offset));
+ memcpy(m_Blocks[nStartBlock] + offset, buffer, nWrite);
+ buffer = static_cast<const uint8_t*>(buffer) + nWrite;
+ size -= nWrite;
+ ++nStartBlock;
+ offset = 0;
+ }
+ return true;
+}
+
+void CFX_MemoryStream::EstimateSize(size_t nInitSize, size_t nGrowSize) {
+ if (m_dwFlags & Type::kConsecutive) {
+ if (m_Blocks.empty()) {
+ m_Blocks.push_back(
+ FX_Alloc(uint8_t, std::max(nInitSize, static_cast<size_t>(4096))));
+ }
+ m_nGrowSize = std::max(nGrowSize, static_cast<size_t>(4096));
+ } else if (m_Blocks.empty()) {
+ m_nGrowSize = std::max(nGrowSize, static_cast<size_t>(4096));
+ }
+}
+
+void CFX_MemoryStream::AttachBuffer(uint8_t* pBuffer, size_t nSize) {
+ if (!(m_dwFlags & Type::kConsecutive))
+ return;
+
+ m_Blocks.clear();
+ m_Blocks.push_back(pBuffer);
+ m_nTotalSize = nSize;
+ m_nCurSize = nSize;
+ m_nCurPos = 0;
+ m_dwFlags = Type::kConsecutive;
+}
+
+void CFX_MemoryStream::DetachBuffer() {
+ if (!(m_dwFlags & Type::kConsecutive))
+ return;
+
+ m_Blocks.clear();
+ m_nTotalSize = 0;
+ m_nCurSize = 0;
+ m_nCurPos = 0;
+ m_dwFlags = Type::kTakeOver;
+}
+
+bool CFX_MemoryStream::ExpandBlocks(size_t size) {
+ m_nCurSize = std::max(m_nCurSize, size);
+ if (size <= m_nTotalSize)
+ return true;
+
+ size = (size - m_nTotalSize + m_nGrowSize - 1) / m_nGrowSize;
+ size_t iCount = m_Blocks.size();
+ m_Blocks.resize(iCount + size);
+ while (size--) {
+ m_Blocks[iCount++] = FX_Alloc(uint8_t, m_nGrowSize);
+ m_nTotalSize += m_nGrowSize;
+ }
+ return true;
+}