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113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
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#ifndef _SPL_ZMOD_H
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#define _SPL_ZMOD_H
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#include <linux/zlib.h>
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/* NOTE: z_compress_level/z_uncompress are nearly identical copies of
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* the compress2/uncompress functions provided by the official zlib
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* package available at http://zlib.net/. The only changes made we to
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* slightly adapt the functioned called to match the linux kernel
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* implementation of zlib.
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*/
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/* ===========================================================================
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* Compresses the source buffer into the destination buffer. The level
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* parameter has the same meaning as in deflateInit. sourceLen is the byte
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* length of the source buffer. Upon entry, destLen is the total size of the
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* destination buffer, which must be at least 0.1% larger than sourceLen plus
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* 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
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*
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* compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
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* memory, Z_BUF_ERROR if there was not enough room in the output buffer,
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* Z_STREAM_ERROR if the level parameter is invalid.
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*/
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static __inline__ int
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z_compress_level(Byte *dest, uLong *destLen, const Byte *source,
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uLong sourceLen, int level)
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{
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z_stream stream;
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int err;
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stream.next_in = (Byte *)source;
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stream.avail_in = (uInt)sourceLen;
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#ifdef MAXSEG_64K
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/* Check for source > 64K on 16-bit machine: */
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if ((uLong)stream.avail_in != sourceLen)
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return Z_BUF_ERROR;
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#endif
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((uLong)stream.avail_out != *destLen)
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return Z_BUF_ERROR;
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err = zlib_deflateInit(&stream, level);
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if (err != Z_OK)
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return err;
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err = zlib_deflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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zlib_deflateEnd(&stream);
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return err == Z_OK ? Z_BUF_ERROR : err;
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}
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*destLen = stream.total_out;
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err = zlib_deflateEnd(&stream);
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return err;
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} /* z_compress_level() */
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/* ===========================================================================
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* Decompresses the source buffer into the destination buffer. sourceLen is
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* the byte length of the source buffer. Upon entry, destLen is the total
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* size of the destination buffer, which must be large enough to hold the
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* entire uncompressed data. (The size of the uncompressed data must have
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* been saved previously by the compressor and transmitted to the decompressor
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* by some mechanism outside the scope of this compression library.)
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* Upon exit, destLen is the actual size of the compressed buffer.
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* This function can be used to decompress a whole file at once if the
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* input file is mmap'ed.
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*
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* uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
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* enough memory, Z_BUF_ERROR if there was not enough room in the output
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* buffer, or Z_DATA_ERROR if the input data was corrupted.
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*/
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static __inline__ int
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z_uncompress(Byte *dest, uLong *destLen, const Byte *source, uLong sourceLen)
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{
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z_stream stream;
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int err;
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stream.next_in = (Byte *)source;
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stream.avail_in = (uInt)sourceLen;
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/* Check for source > 64K on 16-bit machine: */
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if ((uLong)stream.avail_in != sourceLen)
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return Z_BUF_ERROR;
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((uLong)stream.avail_out != *destLen)
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return Z_BUF_ERROR;
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err = zlib_inflateInit(&stream);
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if (err != Z_OK)
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return err;
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err = zlib_inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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zlib_inflateEnd(&stream);
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if (err == Z_NEED_DICT ||
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(err == Z_BUF_ERROR && stream.avail_in == 0))
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return Z_DATA_ERROR;
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return err;
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}
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*destLen = stream.total_out;
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err = zlib_inflateEnd(&stream);
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return err;
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} /* z_uncompress() */
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#endif /* SPL_ZMOD_H */
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