95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
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// Copyright 2017 The PDFium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/fx_stream.h"
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#include <memory>
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#include <utility>
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#include "core/fxcrt/fileaccess_iface.h"
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namespace {
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class CFX_CRTFileStream final : public IFX_SeekableStream {
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public:
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CONSTRUCT_VIA_MAKE_RETAIN;
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// IFX_SeekableStream:
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FX_FILESIZE GetSize() override { return m_pFile->GetSize(); }
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bool IsEOF() override { return GetPosition() >= GetSize(); }
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FX_FILESIZE GetPosition() override { return m_pFile->GetPosition(); }
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bool ReadBlockAtOffset(pdfium::span<uint8_t> buffer,
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FX_FILESIZE offset) override {
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return m_pFile->ReadPos(buffer.data(), buffer.size(), offset) > 0;
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}
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size_t ReadBlock(pdfium::span<uint8_t> buffer) override {
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return m_pFile->Read(buffer.data(), buffer.size());
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}
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bool WriteBlockAtOffset(pdfium::span<const uint8_t> buffer,
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FX_FILESIZE offset) override {
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return !!m_pFile->WritePos(buffer.data(), buffer.size(), offset);
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}
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bool Flush() override { return m_pFile->Flush(); }
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private:
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explicit CFX_CRTFileStream(std::unique_ptr<FileAccessIface> pFA)
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: m_pFile(std::move(pFA)) {}
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~CFX_CRTFileStream() override = default;
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std::unique_ptr<FileAccessIface> m_pFile;
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};
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} // namespace
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bool IFX_WriteStream::WriteString(ByteStringView str) {
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return WriteBlock(str.raw_span());
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}
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bool IFX_WriteStream::WriteByte(uint8_t byte) {
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return WriteBlock({&byte, 1});
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}
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bool IFX_WriteStream::WriteDWord(uint32_t i) {
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char buf[20] = {};
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FXSYS_itoa(i, buf, 10);
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return WriteBlock({reinterpret_cast<uint8_t*>(buf), strlen(buf)});
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}
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bool IFX_WriteStream::WriteFilesize(FX_FILESIZE size) {
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char buf[20] = {};
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FXSYS_i64toa(size, buf, 10);
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return WriteBlock({reinterpret_cast<uint8_t*>(buf), strlen(buf)});
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}
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// static
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RetainPtr<IFX_SeekableReadStream> IFX_SeekableReadStream::CreateFromFilename(
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const char* filename) {
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std::unique_ptr<FileAccessIface> pFA = FileAccessIface::Create();
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if (!pFA->Open(filename))
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return nullptr;
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return pdfium::MakeRetain<CFX_CRTFileStream>(std::move(pFA));
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}
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bool IFX_SeekableWriteStream::WriteBlock(pdfium::span<const uint8_t> buffer) {
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return WriteBlockAtOffset(buffer, GetSize());
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}
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bool IFX_SeekableReadStream::IsEOF() {
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return false;
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}
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FX_FILESIZE IFX_SeekableReadStream::GetPosition() {
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return 0;
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}
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size_t IFX_SeekableReadStream::ReadBlock(pdfium::span<uint8_t> buffer) {
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return 0;
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}
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bool IFX_SeekableStream::WriteBlock(pdfium::span<const uint8_t> buffer) {
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return WriteBlockAtOffset(buffer, GetSize());
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}
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