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