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authorLei Zhang <thestig@chromium.org>2018-08-13 19:08:58 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-08-13 19:08:58 +0000
commitb850c987d141c5578535faba64d14782dbfc13da (patch)
tree25df85e49d3076c59969a2c758e6781b1db6bae2 /core/fxcrt/cfx_readonlymemorystream.cpp
parent5503fe3a9200f966ebc33c808476316e64e6b82b (diff)
downloadpdfium-b850c987d141c5578535faba64d14782dbfc13da.tar.xz
Move CPDFSDK_MemoryAccess to fxcrt.
Rename it CFX_ReadOnlyMemoryStream and swap out one use of CFX_MemoryStream. BUG=pdfium:263 Change-Id: I15012df156a6a4d7c36f6fd58f32c355eae5fa1a Reviewed-on: https://pdfium-review.googlesource.com/39878 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
Diffstat (limited to 'core/fxcrt/cfx_readonlymemorystream.cpp')
-rw-r--r--core/fxcrt/cfx_readonlymemorystream.cpp34
1 files changed, 34 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_readonlymemorystream.cpp b/core/fxcrt/cfx_readonlymemorystream.cpp
new file mode 100644
index 0000000000..1d09759208
--- /dev/null
+++ b/core/fxcrt/cfx_readonlymemorystream.cpp
@@ -0,0 +1,34 @@
+// Copyright 2018 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_readonlymemorystream.h"
+
+#include "core/fxcrt/fx_safe_types.h"
+
+CFX_ReadOnlyMemoryStream::CFX_ReadOnlyMemoryStream(const uint8_t* pBuf,
+ FX_FILESIZE size)
+ : m_pBuf(pBuf), m_size(size) {}
+
+CFX_ReadOnlyMemoryStream::~CFX_ReadOnlyMemoryStream() = default;
+
+FX_FILESIZE CFX_ReadOnlyMemoryStream::GetSize() {
+ return m_size;
+}
+
+bool CFX_ReadOnlyMemoryStream::ReadBlock(void* buffer,
+ FX_FILESIZE offset,
+ size_t size) {
+ if (offset < 0)
+ return false;
+
+ FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
+ newPos += offset;
+ if (!newPos.IsValid() || newPos.ValueOrDie() > m_size)
+ return false;
+
+ memcpy(buffer, m_pBuf + offset, size);
+ return true;
+}