The Tor Browser: other-licenses/7zstub/src/7zip/Common/OutBuffer.cpp@97036ab72558

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.

     1 // OutByte.cpp

     3 #include "StdAfx.h"

     5 #include "OutBuffer.h"

     7 #include "../../Common/Alloc.h"

     9 bool COutBuffer::Create(UInt32 bufferSize)

    10 {

    11   const UInt32 kMinBlockSize = 1;

    12   if (bufferSize < kMinBlockSize)

    13     bufferSize = kMinBlockSize;

    14   if (_buffer != 0 && _bufferSize == bufferSize)

    15     return true;

    16   Free();

    17   _bufferSize = bufferSize;

    18   _buffer = (Byte *)::MidAlloc(bufferSize);

    19   return (_buffer != 0);

    20 }

    22 void COutBuffer::Free()

    23 {

    24   ::MidFree(_buffer);

    25   _buffer = 0;

    26 }

    28 void COutBuffer::SetStream(ISequentialOutStream *stream)

    29 {

    30   _stream = stream;

    31 }

    33 void COutBuffer::Init()

    34 {

    35   _streamPos = 0;

    36   _limitPos = _bufferSize;

    37   _pos = 0;

    38   _processedSize = 0;

    39   _overDict = false;

    40   #ifdef _NO_EXCEPTIONS

    41   ErrorCode = S_OK;

    42   #endif

    43 }

    45 UInt64 COutBuffer::GetProcessedSize() const

    46 {

    47   UInt64 res = _processedSize + _pos - _streamPos;

    48   if (_streamPos > _pos)

    49     res += _bufferSize;

    50   return res;

    51 }

    54 HRESULT COutBuffer::FlushPart()

    55 {

    56   // _streamPos < _bufferSize

    57   UInt32 size = (_streamPos >= _pos) ? (_bufferSize - _streamPos) : (_pos - _streamPos);

    58   HRESULT result = S_OK;

    59   #ifdef _NO_EXCEPTIONS

    60   result = ErrorCode;

    61   #endif

    62   if (_buffer2 != 0)

    63   {

    64     memmove(_buffer2, _buffer + _streamPos, size);

    65     _buffer2 += size;

    66   }

    68   if (_stream != 0

    69       #ifdef _NO_EXCEPTIONS

    70       && (ErrorCode == S_OK)

    71       #endif

    72      )

    73   {

    74     UInt32 processedSize = 0;

    75     result = _stream->Write(_buffer + _streamPos, size, &processedSize);

    76     size = processedSize;

    77   }

    78   _streamPos += size;

    79   if (_streamPos == _bufferSize)

    80     _streamPos = 0;

    81   if (_pos == _bufferSize)

    82   {

    83     _overDict = true;

    84     _pos = 0;

    85   }

    86   _limitPos = (_streamPos > _pos) ? _streamPos : _bufferSize;

    87   _processedSize += size;

    88   return result;

    89 }

    91 HRESULT COutBuffer::Flush()

    92 {

    93   #ifdef _NO_EXCEPTIONS

    94   if (ErrorCode != S_OK)

    95     return ErrorCode;

    96   #endif

    98   while(_streamPos != _pos)

    99   {

   100     HRESULT result = FlushPart();

   101     if (result != S_OK)

   102       return result;

   103   }

   104   return S_OK;

   105 }

   107 void COutBuffer::FlushWithCheck()

   108 {

   109   HRESULT result = FlushPart();

   110   #ifdef _NO_EXCEPTIONS

   111   ErrorCode = result;

   112   #else

   113   if (result != S_OK)

   114     throw COutBufferException(result);

   115   #endif

   116 }

The Tor Browser / file revision

other-licenses/7zstub/src/7zip/Common/OutBuffer.cpp@97036ab72558

other-licenses/7zstub/src/7zip/Common/OutBuffer.cpp