forked from KolibriOS/kolibrios
104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
#include "fitz.h"
|
|
|
|
#ifdef _WIN32 /* Microsoft Visual C++ */
|
|
|
|
typedef signed char int8_t;
|
|
typedef short int int16_t;
|
|
typedef int int32_t;
|
|
typedef __int64 int64_t;
|
|
|
|
typedef unsigned char uint8_t;
|
|
typedef unsigned short int uint16_t;
|
|
typedef unsigned int uint32_t;
|
|
|
|
#else
|
|
#include <inttypes.h>
|
|
#endif
|
|
|
|
#include <jbig2.h>
|
|
|
|
typedef struct fz_jbig2d_s fz_jbig2d;
|
|
|
|
struct fz_jbig2d_s
|
|
{
|
|
fz_stream *chain;
|
|
Jbig2Ctx *ctx;
|
|
Jbig2GlobalCtx *gctx;
|
|
Jbig2Image *page;
|
|
int idx;
|
|
};
|
|
|
|
static void
|
|
close_jbig2d(fz_stream *stm)
|
|
{
|
|
fz_jbig2d *state = stm->state;
|
|
if (state->page)
|
|
jbig2_release_page(state->ctx, state->page);
|
|
if (state->gctx)
|
|
jbig2_global_ctx_free(state->gctx);
|
|
jbig2_ctx_free(state->ctx);
|
|
fz_close(state->chain);
|
|
fz_free(state);
|
|
}
|
|
|
|
static int
|
|
read_jbig2d(fz_stream *stm, unsigned char *buf, int len)
|
|
{
|
|
fz_jbig2d *state = stm->state;
|
|
unsigned char tmp[4096];
|
|
unsigned char *p = buf;
|
|
unsigned char *ep = buf + len;
|
|
unsigned char *s;
|
|
int x, w, n;
|
|
|
|
if (!state->page)
|
|
{
|
|
while (1)
|
|
{
|
|
n = fz_read(state->chain, tmp, sizeof tmp);
|
|
if (n < 0)
|
|
return fz_rethrow(n, "read error in jbig2 filter");
|
|
if (n == 0)
|
|
break;
|
|
jbig2_data_in(state->ctx, tmp, n);
|
|
}
|
|
|
|
jbig2_complete_page(state->ctx);
|
|
|
|
state->page = jbig2_page_out(state->ctx);
|
|
if (!state->page)
|
|
return fz_throw("jbig2_page_out failed");
|
|
}
|
|
|
|
s = state->page->data;
|
|
w = state->page->height * state->page->stride;
|
|
x = state->idx;
|
|
while (p < ep && x < w)
|
|
*p++ = s[x++] ^ 0xff;
|
|
state->idx = x;
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
fz_stream *
|
|
fz_open_jbig2d(fz_stream *chain, fz_buffer *globals)
|
|
{
|
|
fz_jbig2d *state;
|
|
|
|
state = fz_malloc(sizeof(fz_jbig2d));
|
|
state->chain = chain;
|
|
state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, NULL, NULL, NULL);
|
|
state->gctx = NULL;
|
|
state->page = NULL;
|
|
state->idx = 0;
|
|
|
|
if (globals)
|
|
{
|
|
jbig2_data_in(state->ctx, globals->data, globals->len);
|
|
state->gctx = jbig2_make_global_ctx(state->ctx);
|
|
state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, state->gctx, NULL, NULL);
|
|
}
|
|
|
|
return fz_new_stream(state, read_jbig2d, close_jbig2d);
|
|
}
|