// Show detailed information about CAB structures, for debug purposes
static void DumpCAB(string name)
{
FileStream fs = new FileStream(name, FileMode.Open, FileAccess.Read);
CFHeader cfh = new CFHeader(fs);
Console.WriteLine("Cabinet Header");
Console.WriteLine(cfh);
fs.Seek(cfh.uiFilesOffset, SeekOrigin.Begin);
for (int i = 0; i < cfh.usNumFiles; i++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFFile cff = new CFFile(fs);
Console.WriteLine(cff);
}
fs.Seek(cfh.Length, SeekOrigin.Begin);
Console.WriteLine("Cabinet Folders");
for (int i = 0; i < cfh.usNumFolders; i++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFFolder cffld = new CFFolder(fs);
Console.WriteLine(cffld);
fs.Seek(cffld.uiDataOffset, SeekOrigin.Begin);
Console.WriteLine("{0} CFDATA blocks", cffld.usBlocks);
for (int j = 0; j < cffld.usBlocks; j++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFData cfd = new CFData(fs, bLoadData:true);
Console.WriteLine(cfd);
}
}
fs.Close();
}
// Show detailed information about CAB structures, for debug purposes
static void DumpCAB(string name)
{
FileStream fs = new FileStream(name, FileMode.Open, FileAccess.Read);
CFHeader cfh = new CFHeader(fs);
Console.WriteLine("Cabinet Header");
Console.WriteLine(cfh);
fs.Seek(cfh.uiFilesOffset, SeekOrigin.Begin);
for (int i = 0; i < cfh.usNumFiles; i++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFFile cff = new CFFile(fs);
Console.WriteLine(cff);
}
fs.Seek(cfh.Length, SeekOrigin.Begin);
Console.WriteLine("Cabinet Folders");
for (int i = 0; i < cfh.usNumFolders; i++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFFolder cffld = new CFFolder(fs);
Console.WriteLine(cffld);
fs.Seek(cffld.uiDataOffset, SeekOrigin.Begin);
Console.WriteLine("{0} CFDATA blocks", cffld.usBlocks);
for (int j = 0; j < cffld.usBlocks; j++)
{
Console.Write("@{0:X8}h ", fs.Position);
CFData cfd = new CFData(fs, bLoadData: true);
Console.WriteLine(cfd);
}
}
fs.Close();
}
// Expands and copies a folder's segment (starting from "offset" and long "length" bytes) to a file
public int Copy(FileStream input, FileStream output, uint offset, uint length)
{
byte[] tmp;
CFData cfd;
bool bContinuedStream = false;
uint uiStartChunk = offset / 32768;
// If it is the last expanded block, cached...
if (uiStartChunk == uiLastExpandedBlock)
{
bContinuedStream = true;
goto Perform;
}
// If we already started the inflater, we have to skip
// only the blocks between last & next...
if (compressor != null && compressor.bInited)
{
uiStartChunk -= uiLastExpandedBlock;
uiStartChunk--;
}
else
{
input.Seek(uiDataOffset, SeekOrigin.Begin);
}
// We must synchronize the inflater by expanding all previous chunks...
while (uiStartChunk-- > 0)
{
cfd = new CFData(input, bLoadData: true);
if (cfd.Check() == 1)
{
throw new ApplicationException("Corrupted data block found!");
}
tmp = DecompressChunk(cfd.abData, cfd.usCompressedSize, false);
uiLastExpandedBlock++;
}
Perform:
int iStartOffset = (int)offset % 32768; // Start offset inside 1st chunk
int ucb = (int)length; // uncompressed bytes to get expanded
int cb = 0; // uncompressed bytes picked from current chunk
// How many bytes we picked from last block? The remainder is for next call!
while (ucb > 0)
{
if (!bContinuedStream)
{
cfd = new CFData(input, bLoadData: true);
if (cfd.Check() == 1)
{
throw new ApplicationException("Corrupted data block found!");
}
cb = (cfd.usOriginalSize - iStartOffset > ucb) ? ucb : cfd.usOriginalSize - iStartOffset;
// The chunk is the last if cb == ucb
tmp = DecompressChunk(cfd.abData, cfd.usCompressedSize, (ucb == cb));
LastExpandedBlock = tmp;
uiLastExpandedBlock++;
}
else
{
tmp = LastExpandedBlock;
cb = (tmp.Length - iStartOffset > ucb) ? ucb : tmp.Length - iStartOffset;
bContinuedStream = false;
}
output.Write(tmp, iStartOffset, (ucb == cb) ? ucb : tmp.Length - iStartOffset);
ucb -= cb;
iStartOffset = 0;
}
return(1);
}
public int WriteFolder(FileStream output)
{
uiDataOffset = (uint)output.Position;
byte[] main_buf = new byte[32768];
byte[] tmp;
// Cycles through files, filling the tmp buffer upto exactly 32KiB 'til the last chunk
for (int i = 0, ucb = 0; i < cfFiles.Count; i++)
{
FileStream f = new FileStream(cfFiles[i].FileName, FileMode.Open, FileAccess.Read);
Console.WriteLine(" -- adding: {0}", cfFiles[i].FileName);
int req = 32768 - ucb;
while (true)
{
// Restore the pointer to the main buffer
tmp = main_buf;
int cb = f.Read(tmp, ucb, req);
// If it was the last chunk of the last file...
//bool isLast = (cb == 0 && i == cfFiles.Count - 1);
// ATTEMPT!
bool isLast = (cb < 32768 && i == cfFiles.Count - 1);
// ...AND there are no bytes pending, quits!
//if (isLast && ucb == 0) break;
if (isLast && cb == 0)
{
break;
}
ucb += cb;
// If we reached the end of an intermediate file...
if (ucb < 32768 && i < cfFiles.Count - 1)
{
break;
}
int ccb;
if (usCompression != 0 && compressor != null)
{
// An uncompressed 32KiB block MUST be represented by some output
// We tell the compressor if it is the last chunk
tmp = CompressChunk(tmp, ucb, isLast); // "MS"-ZIP or LZX
ccb = tmp.Length;
}
else
{
ccb = ucb;
}
// Makes and saves the CFDATA
CFData cfd = new CFData();
cfd.SetContents(tmp, ccb);
cfd.usOriginalSize = (ushort)ucb;
cfd.usCompressedSize = (ushort)ccb;
cfd.ToStream(output);
usBlocks += 1;
ucb = 0;
req = 32768;
}
f.Close();
}
long pos = output.Position;
output.Position = Position;
ToStream(output);
output.Position = pos;
return(0);
}
public int WriteFolder(FileStream output)
{
uiDataOffset = (uint)output.Position;
byte[] main_buf = new byte[32768];
byte[] tmp;
// Cycles through files, filling the tmp buffer upto exactly 32KiB 'til the last chunk
for (int i=0, ucb=0; i < cfFiles.Count; i++)
{
FileStream f = new FileStream(cfFiles[i].FileName, FileMode.Open, FileAccess.Read);
Console.WriteLine(" -- adding: {0}", cfFiles[i].FileName);
int req = 32768 - ucb;
while (true)
{
// Restore the pointer to the main buffer
tmp = main_buf;
int cb = f.Read(tmp, ucb, req);
// If it was the last chunk of the last file...
//bool isLast = (cb == 0 && i == cfFiles.Count - 1);
// ATTEMPT!
bool isLast = (cb < 32768 && i == cfFiles.Count - 1);
// ...AND there are no bytes pending, quits!
//if (isLast && ucb == 0) break;
if (isLast && cb == 0) break;
ucb += cb;
// If we reached the end of an intermediate file...
if (ucb < 32768 && i < cfFiles.Count - 1) break;
int ccb;
if (usCompression != 0 && compressor != null)
{
// An uncompressed 32KiB block MUST be represented by some output
// We tell the compressor if it is the last chunk
tmp = CompressChunk(tmp, ucb, isLast); // "MS"-ZIP or LZX
ccb = tmp.Length;
}
else
ccb = ucb;
// Makes and saves the CFDATA
CFData cfd = new CFData();
cfd.SetContents(tmp, ccb);
cfd.usOriginalSize = (ushort)ucb;
cfd.usCompressedSize = (ushort)ccb;
cfd.ToStream(output);
usBlocks += 1;
ucb = 0;
req = 32768;
}
f.Close();
}
long pos = output.Position;
output.Position = Position;
ToStream(output);
output.Position = pos;
return 0;
}
// Expands and copies a folder's segment (starting from "offset" and long "length" bytes) to a file
public int Copy(FileStream input, FileStream output, uint offset, uint length)
{
byte[] tmp;
CFData cfd;
bool bContinuedStream = false;
uint uiStartChunk = offset / 32768;
// If it is the last expanded block, cached...
if (uiStartChunk == uiLastExpandedBlock)
{
bContinuedStream = true;
goto Perform;
}
// If we already started the inflater, we have to skip
// only the blocks between last & next...
if (compressor != null && compressor.bInited)
{
uiStartChunk -= uiLastExpandedBlock;
uiStartChunk--;
}
else
{
input.Seek(uiDataOffset, SeekOrigin.Begin);
}
// We must synchronize the inflater by expanding all previous chunks...
while (uiStartChunk-- > 0)
{
cfd = new CFData(input, bLoadData:true);
if (cfd.Check() == 1)
throw new ApplicationException("Corrupted data block found!");
tmp = DecompressChunk(cfd.abData, cfd.usCompressedSize, false);
uiLastExpandedBlock++;
}
Perform:
int iStartOffset = (int)offset % 32768; // Start offset inside 1st chunk
int ucb = (int)length; // uncompressed bytes to get expanded
int cb = 0; // uncompressed bytes picked from current chunk
// How many bytes we picked from last block? The remainder is for next call!
while (ucb > 0)
{
if (!bContinuedStream)
{
cfd = new CFData(input, bLoadData: true);
if (cfd.Check() == 1)
throw new ApplicationException("Corrupted data block found!");
cb = (cfd.usOriginalSize - iStartOffset > ucb) ? ucb : cfd.usOriginalSize - iStartOffset;
// The chunk is the last if cb == ucb
tmp = DecompressChunk(cfd.abData, cfd.usCompressedSize, (ucb == cb));
LastExpandedBlock = tmp;
uiLastExpandedBlock++;
}
else
{
tmp = LastExpandedBlock;
cb = (tmp.Length - iStartOffset > ucb) ? ucb : tmp.Length - iStartOffset;
bContinuedStream = false;
}
output.Write(tmp, iStartOffset, (ucb == cb) ? ucb : tmp.Length - iStartOffset);
ucb -= cb;
iStartOffset = 0;
}
return 1;
}
