167 lines
4.6 KiB
C
167 lines
4.6 KiB
C
#ifndef _XPRESS_H_
|
|
#define _XPRESS_H_
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma once
|
|
#endif
|
|
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* */
|
|
/* Copyright (c) 1991-1999 by Andrew Kadatch */
|
|
/* */
|
|
/* -------------------------------------------------------------------- */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* ---------------------- Common declarations ------------------------- */
|
|
/* ------------------- */
|
|
|
|
// max. size of input block
|
|
#define XPRESS_MAX_BLOCK_LOG 16
|
|
#define XPRESS_MAX_BLOCK (1 << XPRESS_MAX_BLOCK_LOG)
|
|
|
|
|
|
// preferred data alignment to avoid misaligned accesses
|
|
#define XPRESS_ALIGNMENT 8
|
|
|
|
// declare default calling convention used in xpress
|
|
#if !defined (UNIX) && !defined (XPRESS_CALL)
|
|
#define XPRESS_CALL __stdcall
|
|
#endif
|
|
|
|
|
|
// user-supplied callback function that allocates memory
|
|
// if there is no memory available it shall return NULL
|
|
typedef
|
|
void *
|
|
XPRESS_CALL
|
|
XpressAllocFn
|
|
(
|
|
void *context, // user-defined context (as passed to XpressEncodeCreate)
|
|
int size // size of memory block to allocate
|
|
);
|
|
|
|
// user-supplied callback function that releases memory
|
|
typedef
|
|
void
|
|
XPRESS_CALL
|
|
XpressFreeFn
|
|
(
|
|
void *context, // user-defined context (as passed to XpressEncodeClose)
|
|
void *address // pointer to the block to be freed
|
|
);
|
|
|
|
|
|
/* ----------------------------- Encoder ------------------------------ */
|
|
/* ------- */
|
|
|
|
// declare unique anonymous types for type safety
|
|
typedef struct {int XpressEncodeDummy;} *XpressEncodeStream;
|
|
|
|
// allocate and initialize encoder's data structures
|
|
// returns NULL if callback returned NULL (not enough memory)
|
|
XpressEncodeStream
|
|
XPRESS_CALL
|
|
XpressEncodeCreate
|
|
(
|
|
int MaxOrigSize, // max size of original data block
|
|
void *context, // user-defined context info (will be passed to AllocFn)
|
|
XpressAllocFn *AllocFn, // memory allocation callback
|
|
int CompressionLevel // use 0 for speed, 9 for quality
|
|
);
|
|
|
|
|
|
// callback function called by XpressEncode to indicate compression progress
|
|
typedef
|
|
void
|
|
XPRESS_CALL
|
|
XpressProgressFn
|
|
(
|
|
void *context, // user-defined context
|
|
int compressed // size of processed original data
|
|
);
|
|
|
|
|
|
// returns size of compressed data
|
|
// if compression failed then compressed buffer is left as is, and
|
|
// original data should be saved instead
|
|
int
|
|
XPRESS_CALL
|
|
XpressEncode
|
|
(
|
|
XpressEncodeStream stream, // encoder's workspace
|
|
void *CompAdr, int CompSize, // compressed data region
|
|
const void *OrigAdr, int OrigSize, // input data block
|
|
XpressProgressFn *ProgressFn, // NULL or progress callback
|
|
void *ProgressContext, // user-defined context that will be passed to ProgressFn
|
|
int ProgressSize // call ProgressFn each time ProgressSize bytes processed
|
|
);
|
|
|
|
// invalidate input stream and release workspace memory
|
|
void
|
|
XPRESS_CALL
|
|
XpressEncodeClose
|
|
(
|
|
XpressEncodeStream stream, // encoder's workspace
|
|
void *context, XpressFreeFn *FreeFn // memory releasing callback
|
|
);
|
|
|
|
|
|
/* ----------------------------- Decoder ------------------------------ */
|
|
/* ------- */
|
|
|
|
// declare unique anonymous types for type safety
|
|
typedef struct {int XpressDecodeDummy;} *XpressDecodeStream;
|
|
|
|
// allocate memory for decoder. Returns NULL if not enough memory.
|
|
XpressDecodeStream
|
|
XPRESS_CALL
|
|
XpressDecodeCreate
|
|
(
|
|
void *context, // user-defined context info (will be passed to AllocFn)
|
|
XpressAllocFn *AllocFn // memory allocation callback
|
|
);
|
|
|
|
// decode compressed block. Returns # of decoded bytes or -1 otherwise
|
|
int
|
|
XPRESS_CALL
|
|
XpressDecode
|
|
(
|
|
XpressDecodeStream stream, // decoder's workspace
|
|
void *OrigAdr, int OrigSize, // original data region
|
|
int DecodeSize, // # of bytes to decode ( <= OrigSize)
|
|
const void *CompAdr, int CompSize // compressed data block
|
|
);
|
|
|
|
void
|
|
XPRESS_CALL
|
|
XpressDecodeClose
|
|
(
|
|
XpressDecodeStream stream, // encoder's workspace
|
|
void *context, // user-defined context info (will be passed to FreeFn)
|
|
XpressFreeFn *FreeFn // callback that releases the memory
|
|
);
|
|
|
|
|
|
/* ------------------------------ CRC32 ------------------------------- */
|
|
/* ----- */
|
|
|
|
int
|
|
XPRESS_CALL
|
|
XpressCrc32
|
|
(
|
|
const void *data, // beginning of data block
|
|
int bytes, // number of bytes
|
|
int crc // initial value
|
|
);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
};
|
|
#endif
|
|
|
|
#endif /* _XPRESS_H_ */
|