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/*
* lz77.h: common LZ77 compression code between Deflate and LZX.
*/
/*
* The parameter structure you pass to the lz77.c routines to give
* them a way to return the compressed output stream.
*/
struct LZ77InternalContext;
struct LZ77Context {
struct LZ77InternalContext *ictx;
void *userdata;
void (*literal) (struct LZ77Context *ctx, unsigned char c);
void (*match) (struct LZ77Context *ctx, int distance, int len);
};
/*
* Initialise the private fields of an LZ77Context. It's up to the
* user to initialise the public fields.
*/
void lz77_init(struct LZ77Context *ctx, int winsize);
/*
* Clean up the private fields of an LZ77Context.
*/
void lz77_cleanup(struct LZ77Context *ctx);
/*
* Supply data to be compressed. Will update the private fields of
* the LZ77Context, and will call literal() and match() to output.
* If `compress' is FALSE, it will never emit a match, but will
* instead call literal() for everything.
*/
void lz77_compress(struct LZ77Context *ctx,
const unsigned char *data, int len, int compress);
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