Remove MakeSeekableReadStream
This Cl removes the MakeSeekableReadStream call and, at the one place
it's used, creates an IFX_MemoryStream which is a seekable read stream.
Change-Id: I6b0b23636eff47f8caca5432313ba99703e21e4d
Reviewed-on: https://pdfium-review.googlesource.com/4037
Reviewed-by: Nicolás Peña <npm@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/xfa/fxfa/cxfa_fileread.cpp b/xfa/fxfa/cxfa_fileread.cpp
new file mode 100644
index 0000000..e2ecad2
--- /dev/null
+++ b/xfa/fxfa/cxfa_fileread.cpp
@@ -0,0 +1,56 @@
+// 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 "xfa/fxfa/cxfa_fileread.h"
+
+#include <algorithm>
+
+#include "core/fpdfapi/parser/cpdf_stream_acc.h"
+#include "third_party/base/stl_util.h"
+
+CXFA_FileRead::CXFA_FileRead(const std::vector<CPDF_Stream*>& streams) {
+ for (CPDF_Stream* pStream : streams) {
+ m_Data.push_back(pdfium::MakeRetain<CPDF_StreamAcc>(pStream));
+ m_Data.back()->LoadAllData();
+ }
+}
+
+CXFA_FileRead::~CXFA_FileRead() {}
+
+FX_FILESIZE CXFA_FileRead::GetSize() {
+ uint32_t dwSize = 0;
+ for (const auto& acc : m_Data)
+ dwSize += acc->GetSize();
+ return dwSize;
+}
+
+bool CXFA_FileRead::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) {
+ int32_t iCount = pdfium::CollectionSize<int32_t>(m_Data);
+ int32_t index = 0;
+ while (index < iCount) {
+ const auto& acc = m_Data[index];
+ FX_FILESIZE dwSize = acc->GetSize();
+ if (offset < dwSize)
+ break;
+
+ offset -= dwSize;
+ index++;
+ }
+ while (index < iCount) {
+ const auto& acc = m_Data[index];
+ uint32_t dwSize = acc->GetSize();
+ size_t dwRead = std::min(size, static_cast<size_t>(dwSize - offset));
+ memcpy(buffer, acc->GetData() + offset, dwRead);
+ size -= dwRead;
+ if (size == 0)
+ return true;
+
+ buffer = static_cast<uint8_t*>(buffer) + dwRead;
+ offset = 0;
+ index++;
+ }
+ return false;
+}