kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 1 | // Copyright 2014 The PDFium Authors |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 | |
| 7 | #include "core/fxcrt/cfx_fileaccess_posix.h" |
| 8 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 9 | #include <fcntl.h> |
| 10 | #include <sys/stat.h> |
| 11 | #include <unistd.h> |
| 12 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 13 | #include <memory> |
| 14 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 15 | #include "core/fxcrt/fx_stream.h" |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 16 | #include "third_party/base/numerics/safe_conversions.h" |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 17 | |
| 18 | #ifndef O_BINARY |
| 19 | #define O_BINARY 0 |
| 20 | #endif // O_BINARY |
| 21 | |
| 22 | #ifndef O_LARGEFILE |
| 23 | #define O_LARGEFILE 0 |
| 24 | #endif // O_LARGEFILE |
| 25 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 26 | // static |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 27 | std::unique_ptr<FileAccessIface> FileAccessIface::Create() { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 28 | return std::make_unique<CFX_FileAccess_Posix>(); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 29 | } |
| 30 | |
| 31 | CFX_FileAccess_Posix::CFX_FileAccess_Posix() : m_nFD(-1) {} |
| 32 | |
| 33 | CFX_FileAccess_Posix::~CFX_FileAccess_Posix() { |
| 34 | Close(); |
| 35 | } |
| 36 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 37 | bool CFX_FileAccess_Posix::Open(ByteStringView fileName) { |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 38 | if (m_nFD > -1) |
| 39 | return false; |
| 40 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 41 | // TODO(tsepez): check usage of c_str() below. |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 42 | m_nFD = |
| 43 | open(fileName.unterminated_c_str(), O_BINARY | O_LARGEFILE | O_RDONLY); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 44 | return m_nFD > -1; |
| 45 | } |
| 46 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 47 | void CFX_FileAccess_Posix::Close() { |
| 48 | if (m_nFD < 0) { |
| 49 | return; |
| 50 | } |
| 51 | close(m_nFD); |
| 52 | m_nFD = -1; |
| 53 | } |
| 54 | FX_FILESIZE CFX_FileAccess_Posix::GetSize() const { |
| 55 | if (m_nFD < 0) { |
| 56 | return 0; |
| 57 | } |
| 58 | struct stat s; |
| 59 | memset(&s, 0, sizeof(s)); |
| 60 | fstat(m_nFD, &s); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 61 | return pdfium::base::checked_cast<FX_FILESIZE>(s.st_size); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 62 | } |
| 63 | FX_FILESIZE CFX_FileAccess_Posix::GetPosition() const { |
| 64 | if (m_nFD < 0) { |
| 65 | return (FX_FILESIZE)-1; |
| 66 | } |
| 67 | return lseek(m_nFD, 0, SEEK_CUR); |
| 68 | } |
| 69 | FX_FILESIZE CFX_FileAccess_Posix::SetPosition(FX_FILESIZE pos) { |
| 70 | if (m_nFD < 0) { |
| 71 | return (FX_FILESIZE)-1; |
| 72 | } |
| 73 | return lseek(m_nFD, pos, SEEK_SET); |
| 74 | } |
| 75 | size_t CFX_FileAccess_Posix::Read(void* pBuffer, size_t szBuffer) { |
| 76 | if (m_nFD < 0) { |
| 77 | return 0; |
| 78 | } |
| 79 | return read(m_nFD, pBuffer, szBuffer); |
| 80 | } |
| 81 | size_t CFX_FileAccess_Posix::Write(const void* pBuffer, size_t szBuffer) { |
| 82 | if (m_nFD < 0) { |
| 83 | return 0; |
| 84 | } |
| 85 | return write(m_nFD, pBuffer, szBuffer); |
| 86 | } |
| 87 | size_t CFX_FileAccess_Posix::ReadPos(void* pBuffer, |
| 88 | size_t szBuffer, |
| 89 | FX_FILESIZE pos) { |
| 90 | if (m_nFD < 0) { |
| 91 | return 0; |
| 92 | } |
| 93 | if (pos >= GetSize()) { |
| 94 | return 0; |
| 95 | } |
| 96 | if (SetPosition(pos) == (FX_FILESIZE)-1) { |
| 97 | return 0; |
| 98 | } |
| 99 | return Read(pBuffer, szBuffer); |
| 100 | } |
| 101 | size_t CFX_FileAccess_Posix::WritePos(const void* pBuffer, |
| 102 | size_t szBuffer, |
| 103 | FX_FILESIZE pos) { |
| 104 | if (m_nFD < 0) { |
| 105 | return 0; |
| 106 | } |
| 107 | if (SetPosition(pos) == (FX_FILESIZE)-1) { |
| 108 | return 0; |
| 109 | } |
| 110 | return Write(pBuffer, szBuffer); |
| 111 | } |
| 112 | |
| 113 | bool CFX_FileAccess_Posix::Flush() { |
| 114 | if (m_nFD < 0) |
| 115 | return false; |
| 116 | |
| 117 | return fsync(m_nFD) > -1; |
| 118 | } |
| 119 | |
| 120 | bool CFX_FileAccess_Posix::Truncate(FX_FILESIZE szFile) { |
| 121 | if (m_nFD < 0) |
| 122 | return false; |
| 123 | |
| 124 | return !ftruncate(m_nFD, szFile); |
| 125 | } |