c876d3bbef
rbutil uses several components from the utils folder, and can be considered part of utils too. Having it in a separate folder is an arbitrary split that doesn't help anymore these days, so merge them. This also allows other utils to easily use libtools.make without the need to navigate to a different folder. Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/* This file is part of libmspack.
|
|
* (C) 2003-2004 Stuart Caie.
|
|
*
|
|
* The Quantum method was created by David Stafford, adapted by Microsoft
|
|
* Corporation.
|
|
*
|
|
* libmspack is free software; you can redistribute it and/or modify it under
|
|
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
|
|
*
|
|
* For further details, see the file COPYING.LIB distributed with libmspack
|
|
*/
|
|
|
|
#ifndef MSPACK_QTM_H
|
|
#define MSPACK_QTM_H 1
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Quantum compression / decompression definitions */
|
|
|
|
#define QTM_FRAME_SIZE (32768)
|
|
|
|
struct qtmd_modelsym {
|
|
unsigned short sym, cumfreq;
|
|
};
|
|
|
|
struct qtmd_model {
|
|
int shiftsleft, entries;
|
|
struct qtmd_modelsym *syms;
|
|
};
|
|
|
|
struct qtmd_stream {
|
|
struct mspack_system *sys; /* I/O routines */
|
|
struct mspack_file *input; /* input file handle */
|
|
struct mspack_file *output; /* output file handle */
|
|
|
|
unsigned char *window; /* decoding window */
|
|
unsigned int window_size; /* window size */
|
|
unsigned int window_posn; /* decompression offset within window */
|
|
unsigned int frame_todo; /* bytes remaining for current frame */
|
|
|
|
unsigned short H, L, C; /* high/low/current: arith coding state */
|
|
unsigned char header_read; /* have we started decoding a new frame? */
|
|
|
|
int error;
|
|
|
|
/* I/O buffers */
|
|
unsigned char *inbuf, *i_ptr, *i_end, *o_ptr, *o_end;
|
|
unsigned int bit_buffer, inbuf_size;
|
|
unsigned char bits_left, input_end;
|
|
|
|
/* four literal models, each representing 64 symbols
|
|
* model0 for literals from 0 to 63 (selector = 0)
|
|
* model1 for literals from 64 to 127 (selector = 1)
|
|
* model2 for literals from 128 to 191 (selector = 2)
|
|
* model3 for literals from 129 to 255 (selector = 3) */
|
|
struct qtmd_model model0, model1, model2, model3;
|
|
|
|
/* three match models.
|
|
* model4 for match with fixed length of 3 bytes
|
|
* model5 for match with fixed length of 4 bytes
|
|
* model6 for variable length match, encoded with model6len model */
|
|
struct qtmd_model model4, model5, model6, model6len;
|
|
|
|
/* selector model. 0-6 to say literal (0,1,2,3) or match (4,5,6) */
|
|
struct qtmd_model model7;
|
|
|
|
/* symbol arrays for all models */
|
|
struct qtmd_modelsym m0sym[64 + 1];
|
|
struct qtmd_modelsym m1sym[64 + 1];
|
|
struct qtmd_modelsym m2sym[64 + 1];
|
|
struct qtmd_modelsym m3sym[64 + 1];
|
|
struct qtmd_modelsym m4sym[24 + 1];
|
|
struct qtmd_modelsym m5sym[36 + 1];
|
|
struct qtmd_modelsym m6sym[42 + 1], m6lsym[27 + 1];
|
|
struct qtmd_modelsym m7sym[7 + 1];
|
|
};
|
|
|
|
/* allocates Quantum decompression state for decoding the given stream.
|
|
*
|
|
* - returns NULL if window_bits is outwith the range 10 to 21 (inclusive).
|
|
*
|
|
* - uses system->alloc() to allocate memory
|
|
*
|
|
* - returns NULL if not enough memory
|
|
*
|
|
* - window_bits is the size of the Quantum window, from 1Kb (10) to 2Mb (21).
|
|
*
|
|
* - input_buffer_size is the number of bytes to use to store bitstream data.
|
|
*/
|
|
extern struct qtmd_stream *qtmd_init(struct mspack_system *system,
|
|
struct mspack_file *input,
|
|
struct mspack_file *output,
|
|
int window_bits,
|
|
int input_buffer_size);
|
|
|
|
/* decompresses, or decompresses more of, a Quantum stream.
|
|
*
|
|
* - out_bytes of data will be decompressed and the function will return
|
|
* with an MSPACK_ERR_OK return code.
|
|
*
|
|
* - decompressing will stop as soon as out_bytes is reached. if the true
|
|
* amount of bytes decoded spills over that amount, they will be kept for
|
|
* a later invocation of qtmd_decompress().
|
|
*
|
|
* - the output bytes will be passed to the system->write() function given in
|
|
* qtmd_init(), using the output file handle given in qtmd_init(). More
|
|
* than one call may be made to system->write()
|
|
*
|
|
* - Quantum will read input bytes as necessary using the system->read()
|
|
* function given in qtmd_init(), using the input file handle given in
|
|
* qtmd_init(). This will continue until system->read() returns 0 bytes,
|
|
* or an error.
|
|
*/
|
|
extern int qtmd_decompress(struct qtmd_stream *qtm, off_t out_bytes);
|
|
|
|
/* frees all state associated with a Quantum data stream
|
|
*
|
|
* - calls system->free() using the system pointer given in qtmd_init()
|
|
*/
|
|
void qtmd_free(struct qtmd_stream *qtm);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|