BzReader.Indexer.LoadBlock C# (CSharp) Method

        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;
        }