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