// Copyright 2014 PDFium Authors. All rights reserved.
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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/cfx_fileaccess_posix.h"
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#include <memory>
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#include "third_party/base/ptr_util.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif // O_BINARY
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif // O_LARGEFILE
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#if _FX_PLATFORM_ == _FX_PLATFORM_LINUX_ || \
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_FX_PLATFORM_ == _FX_PLATFORM_APPLE_ || \
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_FX_PLATFORM_ == _FX_PLATFORM_ANDROID_
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namespace {
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void GetFileMode(uint32_t dwModes, int32_t& nFlags, int32_t& nMasks) {
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nFlags = O_BINARY | O_LARGEFILE;
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if (dwModes & FX_FILEMODE_ReadOnly) {
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nFlags |= O_RDONLY;
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nMasks = 0;
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} else {
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nFlags |= O_RDWR | O_CREAT;
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if (dwModes & FX_FILEMODE_Truncate) {
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nFlags |= O_TRUNC;
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}
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nMasks = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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}
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}
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} // namespace
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// static
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std::unique_ptr<IFX_FileAccess> IFX_FileAccess::Create() {
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return pdfium::MakeUnique<CFX_FileAccess_Posix>();
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}
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CFX_FileAccess_Posix::CFX_FileAccess_Posix() : m_nFD(-1) {}
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CFX_FileAccess_Posix::~CFX_FileAccess_Posix() {
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Close();
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}
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bool CFX_FileAccess_Posix::Open(const ByteStringView& fileName,
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uint32_t dwMode) {
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if (m_nFD > -1)
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return false;
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int32_t nFlags;
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int32_t nMasks;
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GetFileMode(dwMode, nFlags, nMasks);
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// TODO(tsepez): check usage of c_str() below.
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m_nFD = open(fileName.unterminated_c_str(), nFlags, nMasks);
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return m_nFD > -1;
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}
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bool CFX_FileAccess_Posix::Open(const WideStringView& fileName,
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uint32_t dwMode) {
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return Open(FX_UTF8Encode(fileName).AsStringView(), dwMode);
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}
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void CFX_FileAccess_Posix::Close() {
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if (m_nFD < 0) {
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return;
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}
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close(m_nFD);
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m_nFD = -1;
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}
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FX_FILESIZE CFX_FileAccess_Posix::GetSize() const {
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if (m_nFD < 0) {
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return 0;
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}
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struct stat s;
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memset(&s, 0, sizeof(s));
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fstat(m_nFD, &s);
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return s.st_size;
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}
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FX_FILESIZE CFX_FileAccess_Posix::GetPosition() const {
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if (m_nFD < 0) {
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return (FX_FILESIZE)-1;
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}
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return lseek(m_nFD, 0, SEEK_CUR);
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}
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FX_FILESIZE CFX_FileAccess_Posix::SetPosition(FX_FILESIZE pos) {
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if (m_nFD < 0) {
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return (FX_FILESIZE)-1;
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}
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return lseek(m_nFD, pos, SEEK_SET);
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}
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size_t CFX_FileAccess_Posix::Read(void* pBuffer, size_t szBuffer) {
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if (m_nFD < 0) {
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return 0;
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}
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return read(m_nFD, pBuffer, szBuffer);
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}
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size_t CFX_FileAccess_Posix::Write(const void* pBuffer, size_t szBuffer) {
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if (m_nFD < 0) {
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return 0;
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}
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return write(m_nFD, pBuffer, szBuffer);
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}
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size_t CFX_FileAccess_Posix::ReadPos(void* pBuffer,
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size_t szBuffer,
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FX_FILESIZE pos) {
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if (m_nFD < 0) {
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return 0;
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}
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if (pos >= GetSize()) {
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return 0;
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}
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if (SetPosition(pos) == (FX_FILESIZE)-1) {
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return 0;
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}
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return Read(pBuffer, szBuffer);
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}
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size_t CFX_FileAccess_Posix::WritePos(const void* pBuffer,
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size_t szBuffer,
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FX_FILESIZE pos) {
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if (m_nFD < 0) {
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return 0;
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}
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if (SetPosition(pos) == (FX_FILESIZE)-1) {
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return 0;
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}
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return Write(pBuffer, szBuffer);
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}
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bool CFX_FileAccess_Posix::Flush() {
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if (m_nFD < 0)
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return false;
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return fsync(m_nFD) > -1;
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}
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bool CFX_FileAccess_Posix::Truncate(FX_FILESIZE szFile) {
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if (m_nFD < 0)
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return false;
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return !ftruncate(m_nFD, szFile);
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}
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#endif
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