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1 /* Copyright (C) 2004 Ghostgum Software Pty Ltd. All rights reserved.
3 This software is provided AS-IS with no warranty, either express or
6 This software is distributed under licence and may not be copied,
7 modified or distributed except as expressly authorised under the terms
8 of the licence contained in the file LICENCE in this distribution.
10 For more information about licensing, please refer to
11 http://www.ghostgum.com.au/ or contact Ghostsgum Software Pty Ltd,
12 218 Gallaghers Rd, Glen Waverley VIC 3150, AUSTRALIA,
13 Fax +61 3 9886 6616.
16 /* $Id: clzw.h,v 1.1 2004/07/08 09:14:34 ghostgum Exp $ */
17 /* LZW compression, compatible with PostScript LZWDecode filter */
19 /* Structure for holding LZW compressor state */
20 typedef struct lzw_state_s lzw_state_t;
22 /* allocate and initialise an LZW compressor */
23 lzw_state_t *lzw_new(void);
26 * Compress a buffer with LZW.
27 * Inputs:
28 * inbuf is input buffer
29 * *inlen is count of bytes in the input buffer
30 * outbuf is output buffer
31 * *outlen is the length of the output buffer
32 * Outputs:
33 * *inlen is count of used input bytes
34 * *outlen is the count of output bytes produced
35 * If the output *inlen is not equal to the input *inlen,
36 * then output buffer is full and lzw_compress should
37 * be called again with the remaining input bytes
38 * and another output buffer.
39 * To signal EOD, call with *inlen = 0.
41 void lzw_compress(lzw_state_t *state,
42 const unsigned char *inbuf, int *inlen,
43 unsigned char *outbuf, int *outlen);
46 * Free the LZW structure
47 * You must first have signalled EOD to lzw_compress,
48 * otherwise you will lose data.
50 void lzw_free(lzw_state_t *state);