| author | sl |
| Tue, 10 Jun 2014 14:32:02 +0200 | |
| changeset 1 | 260cb5ec6c19 |
| permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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#include <stdio.h> |
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|
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#include "jpeg_bits.h" |
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|
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/* FIXME */ |
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#define TRUE 1 |
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#define FALSE 0 |
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|
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int jpeg_bits_error (JpegBits *bits) |
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{
|
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return bits->error; |
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} |
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|
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int jpeg_bits_get_u8 (JpegBits *bits) |
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{
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if (bits->ptr < bits->end) {
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return *bits->ptr++; |
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} |
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bits->error = TRUE; |
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return 0; |
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} |
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|
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void jpeg_bits_skip (JpegBits *bits, int n) |
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{
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bits->ptr += n; |
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if (bits->ptr > bits->end) {
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bits->error = TRUE; |
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bits->ptr = bits->end; |
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} |
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} |
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|
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int jpeg_bits_get_u16_be (JpegBits *bits) |
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{
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int x; |
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|
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x = jpeg_bits_get_u8 (bits) << 8; |
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x |= jpeg_bits_get_u8 (bits); |
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|
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return x; |
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} |
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|
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int jpeg_bits_available (JpegBits *bits) |
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{
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return bits->end - bits->ptr; |
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} |
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|
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int bits_needbits(JpegBits *b, int n_bytes) |
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{
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if(b->ptr==NULL)return 1; |
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if(b->ptr + n_bytes > b->end)return 1; |
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|
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return 0; |
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} |
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|
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int getbit(JpegBits *b) |
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{
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int r; |
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|
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r = ((*b->ptr)>>(7-b->idx))&1; |
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|
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b->idx++; |
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if(b->idx>=8){
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b->ptr++; |
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b->idx = 0; |
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} |
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|
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return r; |
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} |
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|
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unsigned int getbits(JpegBits *b, int n) |
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{
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unsigned long r = 0; |
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int i; |
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|
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for(i=0;i<n;i++){
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r <<=1; |
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r |= getbit(b); |
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} |
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|
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return r; |
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} |
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|
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unsigned int peekbits(JpegBits *b, int n) |
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{
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JpegBits tmp = *b; |
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|
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return getbits(&tmp, n); |
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} |
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|
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int getsbits(JpegBits *b, int n) |
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{
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unsigned long r = 0; |
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int i; |
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|
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if(n==0)return 0; |
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r = -getbit(b); |
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for(i=1;i<n;i++){
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r <<=1; |
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r |= getbit(b); |
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} |
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|
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return r; |
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} |
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|
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unsigned int peek_u8(JpegBits *b) |
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{
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return *b->ptr; |
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} |
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|
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unsigned int get_u8(JpegBits *b) |
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{
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return *b->ptr++; |
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} |
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|
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unsigned int get_u16(JpegBits *b) |
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{
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unsigned int r; |
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|
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r = b->ptr[0] | (b->ptr[1]<<8); |
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b->ptr+=2; |
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|
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return r; |
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} |
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|
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unsigned int get_be_u16(JpegBits *b) |
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{
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unsigned int r; |
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|
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r = (b->ptr[0]<<8) | b->ptr[1]; |
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b->ptr+=2; |
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|
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return r; |
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} |
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|
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unsigned int get_u32(JpegBits *b) |
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{
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unsigned int r; |
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|
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r = b->ptr[0] | (b->ptr[1]<<8) | (b->ptr[2]<<16) | (b->ptr[3]<<24); |
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b->ptr+=4; |
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|
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return r; |
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} |
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|
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void syncbits(JpegBits *b) |
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{
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if(b->idx){
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b->ptr++; |
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b->idx=0; |
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} |
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|
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} |
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