Mercurial > vba-linux

     1 // MultiStream.cpp

     2 

     3 #include "StdAfx.h"

     4 

     5 #include "MultiStream.h"

     6 

     7 STDMETHODIMP CMultiStream::Read(void *data, UInt32 size, UInt32 *processedSize)

     8 {

     9   if(processedSize != NULL)

    10     *processedSize = 0;

    11   while(_streamIndex < Streams.Size() && size > 0)

    12   {

    13     CSubStreamInfo &s = Streams[_streamIndex];

    14     if (_pos == s.Size)

    15     {

    16       _streamIndex++;

    17       _pos = 0;

    18       continue;

    19     }

    20     RINOK(s.Stream->Seek(s.Pos + _pos, STREAM_SEEK_SET, 0));

    21     UInt32 sizeToRead = UInt32(MyMin((UInt64)size, s.Size - _pos));

    22     UInt32 realProcessed;

    23     HRESULT result = s.Stream->Read(data, sizeToRead, &realProcessed);

    24     data = (void *)((Byte *)data + realProcessed);

    25     size -= realProcessed;

    26     if(processedSize != NULL)

    27       *processedSize += realProcessed;

    28     _pos += realProcessed;

    29     _seekPos += realProcessed;

    30     RINOK(result);

    31     break;

    32   }

    33   return S_OK;

    34 }

    35   

    36 STDMETHODIMP CMultiStream::Seek(Int64 offset, UInt32 seekOrigin,

    37     UInt64 *newPosition)

    38 {

    39   UInt64 newPos;

    40   switch(seekOrigin)

    41   {

    42     case STREAM_SEEK_SET:

    43       newPos = offset;

    44       break;

    45     case STREAM_SEEK_CUR:

    46       newPos = _seekPos + offset;

    47       break;

    48     case STREAM_SEEK_END:

    49       newPos = _totalLength + offset;

    50       break;

    51     default:

    52       return STG_E_INVALIDFUNCTION;

    53   }

    54   _seekPos = 0;

    55   for (_streamIndex = 0; _streamIndex < Streams.Size(); _streamIndex++)

    56   {

    57     UInt64 size = Streams[_streamIndex].Size;

    58     if (newPos < _seekPos + size)

    59     {

    60       _pos = newPos - _seekPos;

    61       _seekPos += _pos;

    62       if (newPosition != 0)

    63         *newPosition = newPos;

    64       return S_OK;

    65     }

    66     _seekPos += size;

    67   }

    68   if (newPos == _seekPos)

    69   {

    70     if (newPosition != 0)

    71       *newPosition = newPos;

    72     return S_OK;

    73   }

    74   return E_FAIL;

    75 }

    76 

    77 

    78 /*

    79 class COutVolumeStream:

    80   public ISequentialOutStream,

    81   public CMyUnknownImp

    82 {

    83   int _volIndex;

    84   UInt64 _volSize;

    85   UInt64 _curPos;

    86   CMyComPtr<ISequentialOutStream> _volumeStream;

    87   COutArchive _archive;

    88   CCRC _crc;

    89 

    90 public:

    91   MY_UNKNOWN_IMP

    92 

    93   CFileItem _file;

    94   CUpdateOptions _options;

    95   CMyComPtr<IArchiveUpdateCallback2> VolumeCallback;

    96   void Init(IArchiveUpdateCallback2 *volumeCallback,

    97       const UString &name)

    98   {

    99     _file.Name = name;

   100     _file.IsStartPosDefined = true;

   101     _file.StartPos = 0;

   102     

   103     VolumeCallback = volumeCallback;

   104     _volIndex = 0;

   105     _volSize = 0;

   106   }

   107   

   108   HRESULT Flush();

   109   STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);

   110 };

   111 

   112 HRESULT COutVolumeStream::Flush()

   113 {

   114   if (_volumeStream)

   115   {

   116     _file.UnPackSize = _curPos;

   117     _file.FileCRC = _crc.GetDigest();

   118     RINOK(WriteVolumeHeader(_archive, _file, _options));

   119     _archive.Close();

   120     _volumeStream.Release();

   121     _file.StartPos += _file.UnPackSize;

   122   }

   123   return S_OK;

   124 }

   125 */

   126 

   127 /*

   128 STDMETHODIMP COutMultiStream::Write(const void *data, UInt32 size, UInt32 *processedSize)

   129 {

   130   if(processedSize != NULL)

   131     *processedSize = 0;

   132   while(size > 0)

   133   {

   134     if (_streamIndex >= Streams.Size())

   135     {

   136       CSubStreamInfo subStream;

   137       RINOK(VolumeCallback->GetVolumeSize(Streams.Size(), &subStream.Size));

   138       RINOK(VolumeCallback->GetVolumeStream(Streams.Size(), &subStream.Stream));

   139       subStream.Pos = 0;

   140       Streams.Add(subStream);

   141       continue;

   142     }

   143     CSubStreamInfo &subStream = Streams[_streamIndex];

   144     if (_offsetPos >= subStream.Size)

   145     {

   146       _offsetPos -= subStream.Size;

   147       _streamIndex++;

   148       continue;

   149     }

   150     if (_offsetPos != subStream.Pos)

   151     {

   152       CMyComPtr<IOutStream> outStream;

   153       RINOK(subStream.Stream.QueryInterface(IID_IOutStream, &outStream));

   154       RINOK(outStream->Seek(_offsetPos, STREAM_SEEK_SET, NULL));

   155       subStream.Pos = _offsetPos;

   156     }

   157 

   158     UInt32 curSize = (UInt32)MyMin((UInt64)size, subStream.Size - subStream.Pos);

   159     UInt32 realProcessed;

   160     RINOK(subStream.Stream->Write(data, curSize, &realProcessed));

   161     data = (void *)((Byte *)data + realProcessed);

   162     size -= realProcessed;

   163     subStream.Pos += realProcessed;

   164     _offsetPos += realProcessed;

   165     _absPos += realProcessed;

   166     if (_absPos > _length)

   167       _length = _absPos;

   168     if(processedSize != NULL)

   169       *processedSize += realProcessed;

   170     if (subStream.Pos == subStream.Size)

   171     {

   172       _streamIndex++;

   173       _offsetPos = 0;

   174     }

   175     if (realProcessed != curSize && realProcessed == 0)

   176       return E_FAIL;

   177   }

   178   return S_OK;

   179 }

   180 

   181 STDMETHODIMP COutMultiStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)

   182 {

   183   if(seekOrigin >= 3)

   184     return STG_E_INVALIDFUNCTION;

   185   switch(seekOrigin)

   186   {

   187     case STREAM_SEEK_SET:

   188       _absPos = offset;

   189       break;

   190     case STREAM_SEEK_CUR:

   191       _absPos += offset;

   192       break;

   193     case STREAM_SEEK_END:

   194       _absPos = _length + offset;

   195       break;

   196   }

   197   _offsetPos = _absPos;

   198   _streamIndex = 0;

   199   return S_OK;

   200 }

   201 */
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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