| // Copyright 2014 The PDFium Authors |
| // 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 <fcntl.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include <memory> |
| |
| #include "core/fxcrt/fx_stream.h" |
| #include "third_party/base/numerics/safe_conversions.h" |
| |
| #ifndef O_BINARY |
| #define O_BINARY 0 |
| #endif // O_BINARY |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif // O_LARGEFILE |
| |
| // static |
| std::unique_ptr<FileAccessIface> FileAccessIface::Create() { |
| return std::make_unique<CFX_FileAccess_Posix>(); |
| } |
| |
| CFX_FileAccess_Posix::CFX_FileAccess_Posix() : m_nFD(-1) {} |
| |
| CFX_FileAccess_Posix::~CFX_FileAccess_Posix() { |
| Close(); |
| } |
| |
| bool CFX_FileAccess_Posix::Open(ByteStringView fileName) { |
| if (m_nFD > -1) |
| return false; |
| |
| // TODO(tsepez): check usage of c_str() below. |
| m_nFD = |
| open(fileName.unterminated_c_str(), O_BINARY | O_LARGEFILE | O_RDONLY); |
| return m_nFD > -1; |
| } |
| |
| 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 pdfium::base::checked_cast<FX_FILESIZE>(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); |
| } |