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/*
* Header file for the portable free JBIG compression library
*
* Markus Kuhn -- http://www.cl.cam.ac.uk/~mgk25/
*
* $Id: jbig.h,v 1.17 2004-06-11 15:18:21+01 mgk25 Exp $
*/
#ifndef JBG_H
#define JBG_H
#include <stddef.h>
/*
* JBIG-KIT version number
*/
#define JBG_VERSION "1.6"
/*
* Buffer block for SDEs which are temporarily stored by encoder
*/
#define JBG_BUFSIZE 4000
struct jbg_buf {
unsigned char d[JBG_BUFSIZE]; /* one block of a buffer list */
int len; /* length of the data in this block */
struct jbg_buf *next; /* pointer to next block */
struct jbg_buf *previous; /* pointer to previous block *
* (unused in freelist) */
struct jbg_buf *last; /* only used in list head: final block of list */
struct jbg_buf **free_list; /* pointer to pointer to head of free list */
};
/*
* Maximum number of ATMOVEs per stripe that decoder can handle
*/
#define JBG_ATMOVES_MAX 64
/*
* Option and order flags
*/
#define JBG_HITOLO 0x08
#define JBG_SEQ 0x04
#define JBG_ILEAVE 0x02
#define JBG_SMID 0x01
#define JBG_LRLTWO 0x40
#define JBG_VLENGTH 0x20
#define JBG_TPDON 0x10
#define JBG_TPBON 0x08
#define JBG_DPON 0x04
#define JBG_DPPRIV 0x02
#define JBG_DPLAST 0x01
#define JBG_DELAY_AT 0x100 /* delay ATMOVE until the first line of the next
* stripe. Option available for compatibility
* with conformance test example in clause 7.2.*/
/*
* Possible error code return values
*/
#define JBG_EOK 0
#define JBG_EOK_INTR 1
#define JBG_EAGAIN 2
#define JBG_ENOMEM 3
#define JBG_EABORT 4
#define JBG_EMARKER 5
#define JBG_ENOCONT 6
#define JBG_EINVAL 7
#define JBG_EIMPL 8
/*
* Language code for error message strings (based on ISO 639 2-letter
* standard language name abbreviations).
*/
#define JBG_EN 0 /* English */
#define JBG_DE_8859_1 1 /* German in ISO Latin 1 character set */
#define JBG_DE_UTF_8 2 /* German in Unicode UTF-8 encoding */
/*
* Status description of an arithmetic encoder
*/
struct jbg_arenc_state {
unsigned char st[4096]; /* probability status for contexts, MSB = MPS */
unsigned long c; /* C register, base of coding intervall, *
* layout as in Table 23 */
unsigned long a; /* A register, normalized size of coding intervall */
long sc; /* counter for buffered 0xff values which might overflow */
int ct; /* bit shift counter, determines when next byte will be written */
int buffer; /* buffer for most recent output byte != 0xff */
void (*byte_out)(int, void *); /* function which receives all PSCD bytes */
void *file; /* parameter passed to byte_out */
};
/*
* Status description of an arithmetic decoder
*/
enum jbg_ardec_result {
JBG_OK, /* symbol has been successfully decoded */
JBG_READY, /* no more bytes of this PSCD required, marker *
* encountered, probably more symbols available */
JBG_MORE, /* more PSCD data bytes required to decode a symbol */
JBG_MARKER /* more PSCD data bytes required, ignored final 0xff byte */
};
struct jbg_ardec_state {
unsigned char st[4096]; /* probability status for contexts, MSB = MPS */
unsigned long c; /* C register, base of coding intervall, *
* layout as in Table 25 */
unsigned long a; /* A register, normalized size of coding intervall */
int ct; /* bit shift counter, determines when next byte will be read */
unsigned char *pscd_ptr; /* pointer to next PSCD data byte */
unsigned char *pscd_end; /* pointer to byte after PSCD */
enum jbg_ardec_result result; /* result of previous decode call */
int startup; /* controls initial fill of s->c */
};
#ifdef TEST_CODEC
void arith_encode_init(struct jbg_arenc_state *s, int reuse_st);
void arith_encode_flush(struct jbg_arenc_state *s);
void arith_encode(struct jbg_arenc_state *s, int cx, int pix);
void arith_decode_init(struct jbg_ardec_state *s, int reuse_st);
int arith_decode(struct jbg_ardec_state *s, int cx);
#endif
/*
* Status of a JBIG encoder
*/
struct jbg_enc_state {
int d; /* resolution layer of the input image */
unsigned long xd, yd; /* size of the input image (resolution layer d) */
unsigned long yd1; /* BIH announced height of image, use yd1 != yd to
emulate T.85-style NEWLEN height updates for tests */
int planes; /* number of different bitmap planes */
int dl; /* lowest resolution layer in the next BIE */
int dh; /* highest resolution layer in the next BIE */
unsigned long l0; /* number of lines per stripe at lowest *
* resolution layer 0 */
unsigned long stripes; /* number of stripes required (determ. by l0) */
unsigned char **lhp[2]; /* pointers to lower/higher resolution images */
int *highres; /* index [plane] of highres image in lhp[] */
int order; /* SDE ordering parameters */
int options; /* encoding parameters */
unsigned mx, my; /* maximum ATMOVE window size */
int *tx; /* array [plane] with x-offset of adaptive template pixel */
char *dppriv; /* optional private deterministic prediction table */
char *res_tab; /* table for the resolution reduction algorithm */
struct jbg_buf ****sde; /* array [stripe][layer][plane] pointers to *
* buffers for stored SDEs */
struct jbg_arenc_state *s; /* array [planes] for arithm. encoder status */
struct jbg_buf *free_list; /* list of currently unused SDE block buffers */
void (*data_out)(unsigned char *start, size_t len, void *file);
/* data write callback */
void *file; /* parameter passed to data_out() */
char *tp; /* buffer for temp. values used by diff. typical prediction */
};
/*
* Status of a JBIG decoder
*/
struct jbg_dec_state {
/* data from BIH */
int d; /* resolution layer of the full image */
int dl; /* first resolution layer in this BIE */
unsigned long xd, yd; /* size of the full image (resolution layer d) */
int planes; /* number of different bitmap planes */
unsigned long l0; /* number of lines per stripe at lowest *
* resolution layer 0 */
unsigned long stripes; /* number of stripes required (determ. by l0) */
int order; /* SDE ordering parameters */
int options; /* encoding parameters */
int mx, my; /* maximum ATMOVE window size */
char *dppriv; /* optional private deterministic prediction table */
/* loop variables */
unsigned long ii[3]; /* current stripe, layer, plane (outer loop first) */
/*
* Pointers to array [planes] of lower/higher resolution images.
* lhp[d & 1] contains image of layer d.
*/
unsigned char **lhp[2];
/* status information */
int **tx, **ty; /* array [plane][layer-dl] with x,y-offset of AT pixel */
struct jbg_ardec_state **s; /* array [plane][layer-dl] for arithmetic *
* decoder status */
int **reset; /* array [plane][layer-dl] remembers if previous stripe *
* in that plane/resolution ended with SDRST. */
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 in current SDE */
unsigned long i; /* line in current SDE (first line of each stripe is 0) */
int at_moves; /* number of AT moves in the current stripe */
unsigned long at_line[JBG_ATMOVES_MAX]; /* lines at which an *
* AT move will happen */
int at_tx[JBG_ATMOVES_MAX], at_ty[JBG_ATMOVES_MAX]; /* ATMOVE offsets in *
* current stripe */
unsigned long line_h1, line_h2, line_h3; /* variables of decode_pscd */
unsigned long line_l1, line_l2, line_l3;
int pseudo; /* flag for TPBON/TPDON: next pixel is pseudo pixel */
int **lntp; /* flag [plane][layer-dl] for TP: line is not typical */
unsigned long xmax, ymax; /* if possible abort before image gets *
* larger than this size */
int dmax; /* abort after this layer */
};
/* some macros (too trivial for a function) */
#define jbg_dec_getplanes(s) ((s)->planes)
/* function prototypes */
void jbg_enc_init(struct jbg_enc_state *s, unsigned long x, unsigned long y,
int planes, unsigned char **p,
void (*data_out)(unsigned char *start, size_t len,
void *file),
void *file);
int jbg_enc_lrlmax(struct jbg_enc_state *s, unsigned long mwidth,
unsigned long mheight);
void jbg_enc_layers(struct jbg_enc_state *s, int d);
int jbg_enc_lrange(struct jbg_enc_state *s, int dl, int dh);
void jbg_enc_options(struct jbg_enc_state *s, int order, int options,
unsigned long l0, int mx, int my);
void jbg_enc_out(struct jbg_enc_state *s);
void jbg_enc_free(struct jbg_enc_state *s);
void jbg_dec_init(struct jbg_dec_state *s);
void jbg_dec_maxsize(struct jbg_dec_state *s, unsigned long xmax,
unsigned long ymax);
int jbg_dec_in(struct jbg_dec_state *s, unsigned char *data, size_t len,
size_t *cnt);
long jbg_dec_getwidth(const struct jbg_dec_state *s);
long jbg_dec_getheight(const struct jbg_dec_state *s);
unsigned char *jbg_dec_getimage(const struct jbg_dec_state *s, int plane);
long jbg_dec_getsize(const struct jbg_dec_state *s);
void jbg_dec_merge_planes(const struct jbg_dec_state *s, int use_graycode,
void (*data_out)(unsigned char *start, size_t len,
void *file), void *file);
long jbg_dec_getsize_merged(const struct jbg_dec_state *s);
void jbg_dec_free(struct jbg_dec_state *s);
const char *jbg_strerror(int errnum, int language);
void jbg_int2dppriv(unsigned char *dptable, const char *internal);
void jbg_dppriv2int(char *internal, const unsigned char *dptable);
unsigned long jbg_ceil_half(unsigned long x, int n);
void jbg_split_planes(unsigned long x, unsigned long y, int has_planes,
int encode_planes,
const unsigned char *src, unsigned char **dest,
int use_graycode);
int jbg_newlen(unsigned char *bie, size_t len);
#endif /* JBG_H */