ref: 6c00475e659e7f29c142e879ec3dd9d4b5375ee5
dir: /jbig2_priv.h/
/*
jbig2dec
Copyright (c) 2002 artofcode LLC.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
$Id: jbig2_priv.h,v 1.11 2002/07/04 13:34:29 giles Exp $
shared library internals
*/
typedef uint8_t byte;
typedef int bool;
#define TRUE 1
#define FALSE 0
#ifndef NULL
#define NULL ((void*)0)
#endif
typedef enum {
JBIG2_FILE_HEADER,
JBIG2_FILE_SEQUENTIAL_HEADER,
JBIG2_FILE_SEQUENTIAL_BODY,
JBIG2_FILE_RANDOM_HEADERS,
JBIG2_FILE_RANDOM_BODIES,
JBIG2_FILE_EOF
} Jbig2FileState;
struct _Jbig2Ctx {
Jbig2Allocator *allocator;
Jbig2Options options;
const Jbig2Ctx *global_ctx;
Jbig2ErrorCallback error_callback;
void *error_callback_data;
byte *buf;
size_t buf_size;
int buf_rd_ix;
int buf_wr_ix;
Jbig2FileState state;
byte file_header_flags;
int32_t n_pages;
int n_segments;
int n_segments_max;
Jbig2Segment **segments;
int segment_index;
/* list of decoded pages, including the one in progress,
currently stored as a contiguous, 0-indexed array. */
int current_page;
int max_page_index;
Jbig2Page *pages;
};
int32_t
jbig2_get_int32 (const byte *buf);
int16_t
jbig2_get_int16 (const byte *buf);
/* dynamic memory management */
void *
jbig2_alloc (Jbig2Allocator *allocator, size_t size);
void
jbig2_free (Jbig2Allocator *allocator, void *p);
void *
jbig2_realloc (Jbig2Allocator *allocator, void *p, size_t size);
#define jbig2_new(ctx, t, size) ((t *)jbig2_alloc(ctx->allocator, (size) * sizeof(t)))
#define jbig2_renew(ctx, p, t, size) ((t *)jbig2_realloc(ctx->allocator, (p), (size) * sizeof(t)))
int
jbig2_error (Jbig2Ctx *ctx, Jbig2Severity severity, int32_t seg_idx,
const char *fmt, ...);
/* the page structure handles decoded page
results. it's allocated by a 'page info'
segement and marked complete by an 'end of page'
segment.
*/
typedef enum {
JBIG2_PAGE_FREE,
JBIG2_PAGE_NEW,
JBIG2_PAGE_COMPLETE,
JBIG2_PAGE_RETURNED,
JBIG2_PAGE_RELEASED
} Jbig2PageState;
struct _Jbig2Page {
Jbig2PageState state;
uint32_t number;
uint32_t height, width; /* in pixels */
uint32_t x_resolution,
y_resolution; /* in pixels per meter */
uint16_t stripe_size;
bool striped;
uint8_t flags;
Jbig2Image *image;
};
int jbig2_read_page_info (Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
int jbig2_complete_page (Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
typedef enum {
JBIG2_COMPOSE_OR = 0,
JBIG2_COMPOSE_AND = 1,
JBIG2_COMPOSE_XOR = 2,
JBIG2_COMPOSE_XNOR = 3
} Jbig2ComposeOp;
int jbig2_image_compose(Jbig2Ctx *ctx, Jbig2Image *dst, Jbig2Image *src, int x, int y, Jbig2ComposeOp op);
/* region segment info */
typedef struct {
int32_t width;
int32_t height;
int32_t x;
int32_t y;
byte flags;
} Jbig2RegionSegmentInfo;
void jbig2_get_region_segment_info(Jbig2RegionSegmentInfo *info, const byte *segment_data);
int jbig2_read_text_info(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
/* 7.4 */
int jbig2_immediate_generic_region(Jbig2Ctx *ctx, Jbig2Segment *segment,
const uint8_t *segment_data);
/* The word stream design is a compromise between simplicity and
trying to amortize the number of method calls. Each ::get_next_word
invocation pulls 4 bytes from the stream, packed big-endian into a
32 bit word. The offset argument is provided as a convenience. It
begins at 0 and increments by 4 for each successive invocation. */
typedef struct _Jbig2WordStream Jbig2WordStream;
struct _Jbig2WordStream {
uint32_t (*get_next_word) (Jbig2WordStream *self, int offset);
};
Jbig2WordStream *
jbig2_word_stream_buf_new(Jbig2Ctx *ctx, const byte *data, size_t size);
void
jbig2_word_stream_buf_free(Jbig2Ctx *ctx, Jbig2WordStream *ws);