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/* * Header file for the portable JBIG compression library * * Copyright 1995-2014 -- Markus Kuhn -- http://www.cl.cam.ac.uk/~mgk25/ */ #ifndef JBG_H #define JBG_H #include <stddef.h> #include "jbig_ar.h" /* * JBIG-KIT version number */ #define JBG_VERSION "2.1" #define JBG_VERSION_MAJOR 2 #define JBG_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 JBG_LICENCE "GPL" /* * 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 /* encoding options that will not be indicated in the header */ #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. */ #define JBG_SDRST 0x200 /* Use SDRST instead of SDNORM. This option is * there for anyone who needs to generate * test data that covers the SDRST cases. */ /* * 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) #define JBG_ENOCONT (8 << 4) /* * 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 */ 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 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 */ size_t maxmem; /* return JBG_ENOMEM if final image layer D would require more than maxmem bytes */ }; /* 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); unsigned long jbg_dec_getwidth(const struct jbg_dec_state *s); unsigned long jbg_dec_getheight(const struct jbg_dec_state *s); unsigned char *jbg_dec_getimage(const struct jbg_dec_state *s, int plane); unsigned 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); unsigned 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); 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 */