| 0,0 → 1,139 |
|---|
| /* |
| jbig2dec |
| |
| Copyright (C) 2001 Artifex Software, Inc. |
| |
| This software is provided AS-IS with no warranty, |
| either express or implied. |
| |
| This software is distributed under license and may not |
| be copied, modified or distributed except as expressly |
| authorized under the terms of the license contained in |
| the file LICENSE in this distribution. |
| |
| For further licensing information refer to http://artifex.com/ or |
| contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, |
| San Rafael, CA 94903, U.S.A., +1(415)492-9861. |
| */ |
| |
| /* Annex A */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #include "os_types.h" |
| |
| #include <stddef.h> |
| #include <string.h> /* memset() */ |
| |
| #include "jbig2.h" |
| #include "jbig2_priv.h" |
| #include "jbig2_arith.h" |
| #include "jbig2_arith_int.h" |
| |
| struct _Jbig2ArithIntCtx { |
| Jbig2ArithCx IAx[512]; |
| }; |
| |
| Jbig2ArithIntCtx * |
| jbig2_arith_int_ctx_new(Jbig2Ctx *ctx) |
| { |
| Jbig2ArithIntCtx *result = jbig2_new(ctx, Jbig2ArithIntCtx, 1); |
| |
| memset(result->IAx, 0, sizeof(result->IAx)); |
| |
| return result; |
| } |
| |
| /* A.2 */ |
| /* Return value: -1 on error, 0 on normal value, 1 on OOB return. */ |
| int |
| jbig2_arith_int_decode(Jbig2ArithIntCtx *ctx, Jbig2ArithState *as, |
| int32_t *p_result) |
| { |
| Jbig2ArithCx *IAx = ctx->IAx; |
| int PREV = 1; |
| int S, V; |
| int bit; |
| int n_tail, offset; |
| int i; |
| |
| S = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | S; |
| |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | bit; |
| if (bit) |
| { |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | bit; |
| |
| if (bit) |
| { |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | bit; |
| |
| if (bit) |
| { |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | bit; |
| |
| if (bit) |
| { |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = (PREV << 1) | bit; |
| |
| if (bit) |
| { |
| n_tail = 32; |
| offset = 4436; |
| } |
| else |
| { |
| n_tail = 12; |
| offset = 340; |
| } |
| } |
| else |
| { |
| n_tail = 8; |
| offset = 84; |
| } |
| } |
| else |
| { |
| n_tail = 6; |
| offset = 20; |
| } |
| } |
| else |
| { |
| n_tail = 4; |
| offset = 4; |
| } |
| } |
| else |
| { |
| n_tail = 2; |
| offset = 0; |
| } |
| |
| V = 0; |
| for (i = 0; i < n_tail; i++) |
| { |
| bit = jbig2_arith_decode(as, &IAx[PREV]); |
| PREV = ((PREV << 1) & 511) | (PREV & 256) | bit; |
| V = (V << 1) | bit; |
| } |
| |
| V += offset; |
| V = S ? -V : V; |
| *p_result = V; |
| return S && V == 0 ? 1 : 0; |
| } |
| |
| void |
| jbig2_arith_int_ctx_free(Jbig2Ctx *ctx, Jbig2ArithIntCtx *iax) |
| { |
| jbig2_free(ctx->allocator, iax); |
| } |
| Property changes: |
|---|
| Added: svn:executable |
|---|
| +* |
|---|
| \ No newline at end of property |
|---|