ref: 5d215388772fd0c2931cdc4cafca74c1256bfea6
dir: /jbig2_priv.h/
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, ...); typedef uint8_t byte; typedef int bool; typedef struct _Jbig2Result Jbig2Result; /* The result of decoding a segment. See 0.1.5 */ struct _Jbig2Result { int32_t segment_number; int segment_type; void (*free)(const Jbig2Result *self, Jbig2Ctx *ctx); }; 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; int buf_size; int buf_rd_ix; int buf_wr_ix; Jbig2FileState state; byte file_header_flags; int32_t n_pages; int n_sh; int n_sh_max; Jbig2SegmentHeader **sh_list; int sh_ix; /* The map from segment numbers to decoding results, currently stored as a contiguous, 0-indexed array. */ int n_results; int n_results_max; const Jbig2Result **results; }; int32_t jbig2_get_int32 (const byte *buf); int16_t jbig2_get_int16 (const byte *buf); /* 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); const Jbig2Result * jbig2_get_result(Jbig2Ctx *ctx, int32_t segment_number); int jbig2_put_result(Jbig2Ctx *ctx, const Jbig2Result *result);