1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/*
* 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 $
* $Id: jbig.h,v 1.3 2004/06/12 02:33:05 rick 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 */
|
