other-licenses/7zstub/src/7zip/Common/InOutTempBuffer.cpp@97036ab72558 (annotated)
other-licenses/7zstub/src/7zip/Common/InOutTempBuffer.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | // InOutTempBuffer.cpp |
| michael@0 | 2 | |
| michael@0 | 3 | #include "StdAfx.h" |
| michael@0 | 4 | |
| michael@0 | 5 | #include "InOutTempBuffer.h" |
| michael@0 | 6 | #include "../../Common/Defs.h" |
| michael@0 | 7 | // #include "Windows/Defs.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #include "StreamUtils.h" |
| michael@0 | 10 | |
| michael@0 | 11 | using namespace NWindows; |
| michael@0 | 12 | using namespace NFile; |
| michael@0 | 13 | using namespace NDirectory; |
| michael@0 | 14 | |
| michael@0 | 15 | static UInt32 kTmpBufferMemorySize = (1 << 20); |
| michael@0 | 16 | |
| michael@0 | 17 | static LPCTSTR kTempFilePrefixString = TEXT("iot"); |
| michael@0 | 18 | |
| michael@0 | 19 | CInOutTempBuffer::CInOutTempBuffer(): |
| michael@0 | 20 | _buffer(NULL) |
| michael@0 | 21 | { |
| michael@0 | 22 | } |
| michael@0 | 23 | |
| michael@0 | 24 | void CInOutTempBuffer::Create() |
| michael@0 | 25 | { |
| michael@0 | 26 | _buffer = new Byte[kTmpBufferMemorySize]; |
| michael@0 | 27 | } |
| michael@0 | 28 | |
| michael@0 | 29 | CInOutTempBuffer::~CInOutTempBuffer() |
| michael@0 | 30 | { |
| michael@0 | 31 | delete []_buffer; |
| michael@0 | 32 | } |
| michael@0 | 33 | void CInOutTempBuffer::InitWriting() |
| michael@0 | 34 | { |
| michael@0 | 35 | _bufferPosition = 0; |
| michael@0 | 36 | _tmpFileCreated = false; |
| michael@0 | 37 | _fileSize = 0; |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | bool CInOutTempBuffer::WriteToFile(const void *data, UInt32 size) |
| michael@0 | 41 | { |
| michael@0 | 42 | if (size == 0) |
| michael@0 | 43 | return true; |
| michael@0 | 44 | if(!_tmpFileCreated) |
| michael@0 | 45 | { |
| michael@0 | 46 | CSysString tempDirPath; |
| michael@0 | 47 | if(!MyGetTempPath(tempDirPath)) |
| michael@0 | 48 | return false; |
| michael@0 | 49 | if (_tempFile.Create(tempDirPath, kTempFilePrefixString, _tmpFileName) == 0) |
| michael@0 | 50 | return false; |
| michael@0 | 51 | // _outFile.SetOpenCreationDispositionCreateAlways(); |
| michael@0 | 52 | if(!_outFile.Create(_tmpFileName, true)) |
| michael@0 | 53 | return false; |
| michael@0 | 54 | _tmpFileCreated = true; |
| michael@0 | 55 | } |
| michael@0 | 56 | UInt32 processedSize; |
| michael@0 | 57 | if(!_outFile.Write(data, size, processedSize)) |
| michael@0 | 58 | return false; |
| michael@0 | 59 | _fileSize += processedSize; |
| michael@0 | 60 | return (processedSize == size); |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | bool CInOutTempBuffer::FlushWrite() |
| michael@0 | 64 | { |
| michael@0 | 65 | return _outFile.Close(); |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | bool CInOutTempBuffer::Write(const void *data, UInt32 size) |
| michael@0 | 69 | { |
| michael@0 | 70 | if(_bufferPosition < kTmpBufferMemorySize) |
| michael@0 | 71 | { |
| michael@0 | 72 | UInt32 curSize = MyMin(kTmpBufferMemorySize - _bufferPosition, size); |
| michael@0 | 73 | memmove(_buffer + _bufferPosition, (const Byte *)data, curSize); |
| michael@0 | 74 | _bufferPosition += curSize; |
| michael@0 | 75 | size -= curSize; |
| michael@0 | 76 | data = ((const Byte *)data) + curSize; |
| michael@0 | 77 | _fileSize += curSize; |
| michael@0 | 78 | } |
| michael@0 | 79 | return WriteToFile(data, size); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | bool CInOutTempBuffer::InitReading() |
| michael@0 | 83 | { |
| michael@0 | 84 | _currentPositionInBuffer = 0; |
| michael@0 | 85 | if(_tmpFileCreated) |
| michael@0 | 86 | return _inFile.Open(_tmpFileName); |
| michael@0 | 87 | return true; |
| michael@0 | 88 | } |
| michael@0 | 89 | |
| michael@0 | 90 | HRESULT CInOutTempBuffer::WriteToStream(ISequentialOutStream *stream) |
| michael@0 | 91 | { |
| michael@0 | 92 | if (_currentPositionInBuffer < _bufferPosition) |
| michael@0 | 93 | { |
| michael@0 | 94 | UInt32 sizeToWrite = _bufferPosition - _currentPositionInBuffer; |
| michael@0 | 95 | RINOK(WriteStream(stream, _buffer + _currentPositionInBuffer, sizeToWrite, NULL)); |
| michael@0 | 96 | _currentPositionInBuffer += sizeToWrite; |
| michael@0 | 97 | } |
| michael@0 | 98 | if (!_tmpFileCreated) |
| michael@0 | 99 | return true; |
| michael@0 | 100 | while(true) |
| michael@0 | 101 | { |
| michael@0 | 102 | UInt32 localProcessedSize; |
| michael@0 | 103 | if (!_inFile.ReadPart(_buffer, kTmpBufferMemorySize, localProcessedSize)) |
| michael@0 | 104 | return E_FAIL; |
| michael@0 | 105 | if (localProcessedSize == 0) |
| michael@0 | 106 | return S_OK; |
| michael@0 | 107 | RINOK(WriteStream(stream, _buffer, localProcessedSize, NULL)); |
| michael@0 | 108 | } |
| michael@0 | 109 | } |
| michael@0 | 110 | |
| michael@0 | 111 | STDMETHODIMP CSequentialOutTempBufferImp::Write(const void *data, UInt32 size, UInt32 *processedSize) |
| michael@0 | 112 | { |
| michael@0 | 113 | if (!_buffer->Write(data, size)) |
| michael@0 | 114 | { |
| michael@0 | 115 | if (processedSize != NULL) |
| michael@0 | 116 | *processedSize = 0; |
| michael@0 | 117 | return E_FAIL; |
| michael@0 | 118 | } |
| michael@0 | 119 | if (processedSize != NULL) |
| michael@0 | 120 | *processedSize = size; |
| michael@0 | 121 | return S_OK; |
| michael@0 | 122 | } |
