/// <summary>
/// Loads the bzip2 block from the file
/// </summary>
/// <param name="beginning">The beginning of the block, in bits.</param>
/// <param name="end">The end of the block, in bits.</param>
/// <param name="buf">The buffer to load into.</param>
/// <returns>The length of the loaded data, in bytes</returns>
private long LoadBlock(long beginning, long end, ref byte[] buf)
{
long bufSize = buf.LongLength;
bzip2.StatusCode status = bzip2.BZ2_bzLoadBlock(filePath, beginning, end, buf, ref bufSize);
if (status != bzip2.StatusCode.BZ_OK)
{
throw new Exception(String.Format(Properties.Resources.FailedLoadingBlock, filePath, beginning, status));
}
// Just some initial value, we will reallocate the buffer as needed
if (decompressionBuf == null)
{
decompressionBuf = new byte[buf.Length * 4];
}
int intBufSize = (int)bufSize;
int intDecompSize = decompressionBuf.Length;
status = bzip2.BZ2_bzDecompress(buf, intBufSize, decompressionBuf, ref intDecompSize);
// Limit a single uncompressed block size to 32 Mb
while (status == bzip2.StatusCode.BZ_OUTBUFF_FULL &&
decompressionBuf.Length < 32000000)
{
decompressionBuf = new byte[decompressionBuf.Length * 2];
intDecompSize = decompressionBuf.Length;
status = bzip2.BZ2_bzDecompress(buf, intBufSize, decompressionBuf, ref intDecompSize);
}
if (decompressionBuf.Length > 32000000)
{
throw new Exception(String.Format(Properties.Resources.FailedUncompressingMemory, beginning));
}
if (status != bzip2.StatusCode.BZ_OK)
{
throw new Exception(String.Format(Properties.Resources.FailedUncompressingStatus, beginning, status));
}
// Exchange the raw buffer and the uncompressed one
byte[] exch = buf;
buf = decompressionBuf;
decompressionBuf = exch;
return(intDecompSize);
}
/// <summary>
/// Locates the bzip2 blocks in the file
/// </summary>
private void LocateBlocks()
{
ReportProgress(0, IndexingProgress.State.Running, Properties.Resources.ProgressLocatingBlocks);
FileInfo fi = new FileInfo(filePath);
bz2_filesize = fi.Length;
startTime = DateTime.Now;
elapsed = new TimeSpan(0);
bzip2WatchThread = new Thread(BzipBlockLocatorProgressMonitor);
bzip2WatchThread.Start(); // start the monitor, to report progress
bzip2.StatusCode status = bzip2.BZ2_bzLocateBlocks(filePath, beginnings, ends, ref totalBlocks, ref bz2_blocks_pct_done);
bzip2WatchThread.Abort();
if (status != bzip2.StatusCode.BZ_OK)
{
throw new Exception(String.Format(Properties.Resources.FailedLocatingBlocks, filePath, status));
}
if (totalBlocks < 1)
{
throw new Exception(String.Format(Properties.Resources.NoBlocksFound, filePath));
}
}