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/*
* Header file for the T.85 "light" version of the portable
* JBIG image compression library
*
* Copyright 1995-2014 -- Markus Kuhn -- http://www.cl.cam.ac.uk/~mgk25/
*/
#ifndef JBG85_H
#define JBG85_H
#include <stddef.h>
#include "jbig_ar.h"
/*
* JBIG-KIT version number
*/
#define JBG85_VERSION "2.1"
#define JBG85_VERSION_MAJOR 2
#define JBG85_VERSION_MINOR 1
/*
* JBIG-KIT licence agreement reference code:
* If you use JBIG-KIT under a commercial licence, please replace
* below the letters GPL with the reference code that you received
* with your licence agreement. (This code is typically a letter "A"
* followed by four decimal digits, e.g. "A1234".)
*/
#define JBG85_LICENCE "GPL"
/*
* Maximum number of ATMOVEs per stripe that decoder can handle
*/
#define JBG85_ATMOVES_MAX 1
#ifndef JBG_LRLTWO
/*
* Option and order flags
*/
#define JBG_LRLTWO 0x40
#define JBG_VLENGTH 0x20
#define JBG_TPBON 0x08
/*
* Possible error code return values
*/
#define JBG_EOK (0 << 4)
#define JBG_EOK_INTR (1 << 4)
#define JBG_EAGAIN (2 << 4)
#define JBG_ENOMEM (3 << 4)
#define JBG_EABORT (4 << 4)
#define JBG_EMARKER (5 << 4)
#define JBG_EINVAL (6 << 4)
#define JBG_EIMPL (7 << 4)
#endif
/*
* Status of a JBIG encoder
*/
struct jbg85_enc_state {
unsigned long x0, y0; /* size of the input image */
unsigned long l0; /* number of lines per stripe */
int options; /* encoding parameters */
int newlen; /* 0 = jbg85_enc_newlen() has not yet been called
1 = jbg85_enc_newlen() has updated y0, NEWLEN pending
2 = NEWLEN has already been output */
unsigned mx; /* maximum ATMOVE window size */
unsigned long y; /* next line number to be encoded */
unsigned long i; /* next per-stripe line number to be encoded */
int tx; /* x-offset of adaptive template pixel */
unsigned long c_all, c[128]; /* adaptive template algorithm variables */
int new_tx; /* -1 = no ATMOVE pending, otherwise new TX value */
int ltp_old; /* true if line y-1 was "typical" */
struct jbg_arenc_state s; /* arithmetic encoder status */
void (*data_out)(unsigned char *start, size_t len, void *file);
/* data write callback */
void *file; /* parameter passed to data_out() */
unsigned char *comment; /* content of comment marker segment to be added
at next opportunity (will be reset to NULL
as soon as comment has been written) */
unsigned long comment_len; /* length of data pointed to by comment */
};
/*
* Status of a JBIG decoder
*/
struct jbg85_dec_state {
/* data from BIH */
unsigned long x0, y0; /* size of the full image */
unsigned long l0; /* number of lines per stripe */
int options; /* encoding parameters */
int mx; /* maximum ATMOVE window size */
/* image data */
int p[3]; /* curr. line starts at linebuf+bpl*p[0], prev. line starts
* at linebuf+bpl*p[1], its predecessor at linebuf+bpl*p[2] */
unsigned char *linebuf; /* buffer region provided by caller */
size_t linebuf_len;
size_t bpl; /* bytes per line */
/* status information */
int tx; /* x-offset of AT pixel */
struct jbg_ardec_state s; /* arithmetic decoder status */
unsigned long bie_len; /* number of bytes read so far */
unsigned char buffer[20]; /* used to store BIH or marker segments fragm. */
int buf_len; /* number of bytes in buffer */
unsigned long comment_skip; /* remaining bytes of a COMMENT segment */
unsigned long x; /* x position of next pixel */
unsigned long stripe; /* current stripe */
unsigned long y; /* line in image (first line is 0) */
unsigned long i; /* line in current stripe (first line of stripe is 0) */
int at_moves; /* number of AT moves in the current stripe */
unsigned long at_line[JBG85_ATMOVES_MAX]; /* lines at which an *
* AT move will happen */
int at_tx[JBG85_ATMOVES_MAX]; /* ATMOVE x-offsets in current stripe */
unsigned long line_h1, line_h2, line_h3; /* variables of decode_pscd */
int pseudo; /* flag for TPBON/TPDON: next pixel is pseudo pixel */
int lntp; /* flag for TP: line is not typical */
int (*line_out)(const struct jbg85_dec_state *s,
unsigned char *start, size_t len,
unsigned long y, void *file);
/* data write callback */
void *file; /* parameter passed to data_out() */
int intr; /* flag that line_out requested interrupt */
int end_of_bie; /* flag that the end of the BIE has been signalled */
};
/* function prototypes */
void jbg85_enc_init(struct jbg85_enc_state *s,
unsigned long x0, unsigned long y0,
void (*data_out)(unsigned char *start, size_t len,
void *file),
void *file);
void jbg85_enc_options(struct jbg85_enc_state *s, int options,
unsigned long l0, int mx);
void jbg85_enc_lineout(struct jbg85_enc_state *s, unsigned char *line,
unsigned char *prevline, unsigned char *prevprevline);
void jbg85_enc_newlen(struct jbg85_enc_state *s, unsigned long y0);
void jbg85_enc_abort(struct jbg85_enc_state *s);
void jbg85_dec_init(struct jbg85_dec_state *s,
unsigned char *buf, size_t buflen,
int (*line_out)(const struct jbg85_dec_state *s,
unsigned char *start, size_t len,
unsigned long y, void *file),
void *file);
int jbg85_dec_in(struct jbg85_dec_state *s, unsigned char *data, size_t len,
size_t *cnt);
int jbg85_dec_end(struct jbg85_dec_state *s);
const char *jbg85_strerror(int errnum);
/* some macros for examining decoder state */
#define jbg85_dec_finished(s) ((s)->bie_len == 20 && (s)->y >= (s)->y0)
/* enquire about image size */
#define jbg85_dec_getwidth(s) ((s)->x0)
#define jbg85_dec_getheight(s) ((s)->y0)
/* enquire about validity of image-size results */
#define jbg85_dec_validwidth(s) ((s)->bie_len == 20)
#define jbg85_dec_finalheight(s) ((s)->bie_len == 20 && \
((((s)->options & JBG_VLENGHT) == 0) || \
((s)->y >= (s)->y0)))
#endif /* JBG85_H */
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