/*
+ * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
+ * Copyright (c) 2002-2007, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
- * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
- * Copyright (c) 2005, Herv� Drolon, FreeImage Team
- * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
+ * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
+ * Copyright (c) 2005, Herve Drolon, FreeImage Team
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGE.
*/
-
#include "opj_includes.h"
+/** @defgroup BIO BIO - Individual bit input-output stream */
+/*@{*/
+
+/** @name Local static functions */
+/*@{*/
+
+/**
+Write a bit
+@param bio BIO handle
+@param b Bit to write (0 or 1)
+*/
+static void bio_putbit(opj_bio_t *bio, int b);
+/**
+Read a bit
+@param bio BIO handle
+@return Returns the read bit
+*/
+static int bio_getbit(opj_bio_t *bio);
+/**
+Write a byte
+@param bio BIO handle
+@return Returns 0 if successful, returns 1 otherwise
+*/
+static int bio_byteout(opj_bio_t *bio);
+/**
+Read a byte
+@param bio BIO handle
+@return Returns 0 if successful, returns 1 otherwise
+*/
+static int bio_bytein(opj_bio_t *bio);
+
+/*@}*/
+
+/*@}*/
+
/*
==========================================================
local functions
*/
static int bio_byteout(opj_bio_t *bio) {
- bio->buf = (bio->buf << 8) & 0xffff;
- bio->ct = bio->buf == 0xff00 ? 7 : 8;
- if (bio->bp >= bio->end) {
- return 1;
- }
- *bio->bp++ = bio->buf >> 8;
- return 0;
+ bio->buf = (bio->buf << 8) & 0xffff;
+ bio->ct = bio->buf == 0xff00 ? 7 : 8;
+ if (bio->bp >= bio->end) {
+ return 1;
+ }
+ *bio->bp++ = bio->buf >> 8;
+ return 0;
}
static int bio_bytein(opj_bio_t *bio) {
- bio->buf = (bio->buf << 8) & 0xffff;
- bio->ct = bio->buf == 0xff00 ? 7 : 8;
- if (bio->bp >= bio->end) {
- return 1;
- }
- bio->buf |= *bio->bp++;
- return 0;
+ bio->buf = (bio->buf << 8) & 0xffff;
+ bio->ct = bio->buf == 0xff00 ? 7 : 8;
+ if (bio->bp >= bio->end) {
+ return 1;
+ }
+ bio->buf |= *bio->bp++;
+ return 0;
}
static void bio_putbit(opj_bio_t *bio, int b) {
- if (bio->ct == 0) {
- bio_byteout(bio);
- }
- bio->ct--;
- bio->buf |= b << bio->ct;
+ if (bio->ct == 0) {
+ bio_byteout(bio);
+ }
+ bio->ct--;
+ bio->buf |= b << bio->ct;
}
static int bio_getbit(opj_bio_t *bio) {
- if (bio->ct == 0) {
- bio_bytein(bio);
- }
- bio->ct--;
- return (bio->buf >> bio->ct) & 1;
+ if (bio->ct == 0) {
+ bio_bytein(bio);
+ }
+ bio->ct--;
+ return (bio->buf >> bio->ct) & 1;
}
/*
==========================================================
*/
-opj_bio_t* bio_create() {
- opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
- return bio;
+opj_bio_t* bio_create(void) {
+ opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
+ return bio;
}
void bio_destroy(opj_bio_t *bio) {
- if(bio) {
- opj_free(bio);
- }
+ if(bio) {
+ opj_free(bio);
+ }
}
int bio_numbytes(opj_bio_t *bio) {
- return (bio->bp - bio->start);
+ return (bio->bp - bio->start);
}
void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) {
- bio->start = bp;
- bio->end = bp + len;
- bio->bp = bp;
- bio->buf = 0;
- bio->ct = 8;
+ bio->start = bp;
+ bio->end = bp + len;
+ bio->bp = bp;
+ bio->buf = 0;
+ bio->ct = 8;
}
void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) {
- bio->start = bp;
- bio->end = bp + len;
- bio->bp = bp;
- bio->buf = 0;
- bio->ct = 0;
+ bio->start = bp;
+ bio->end = bp + len;
+ bio->bp = bp;
+ bio->buf = 0;
+ bio->ct = 0;
}
void bio_write(opj_bio_t *bio, int v, int n) {
- int i;
- for (i = n - 1; i >= 0; i--) {
- bio_putbit(bio, (v >> i) & 1);
- }
+ int i;
+ for (i = n - 1; i >= 0; i--) {
+ bio_putbit(bio, (v >> i) & 1);
+ }
}
int bio_read(opj_bio_t *bio, int n) {
- int i, v;
- v = 0;
- for (i = n - 1; i >= 0; i--) {
- v += bio_getbit(bio) << i;
- }
- return v;
+ int i, v;
+ v = 0;
+ for (i = n - 1; i >= 0; i--) {
+ v += bio_getbit(bio) << i;
+ }
+ return v;
}
int bio_flush(opj_bio_t *bio) {
- bio->ct = 0;
- if (bio_byteout(bio)) {
- return 1;
- }
- if (bio->ct == 7) {
- bio->ct = 0;
- if (bio_byteout(bio)) {
- return 1;
- }
- }
- return 0;
+ bio->ct = 0;
+ if (bio_byteout(bio)) {
+ return 1;
+ }
+ if (bio->ct == 7) {
+ bio->ct = 0;
+ if (bio_byteout(bio)) {
+ return 1;
+ }
+ }
+ return 0;
}
int bio_inalign(opj_bio_t *bio) {
- bio->ct = 0;
- if ((bio->buf & 0xff) == 0xff) {
- if (bio_bytein(bio)) {
- return 1;
- }
- bio->ct = 0;
- }
- return 0;
+ bio->ct = 0;
+ if ((bio->buf & 0xff) == 0xff) {
+ if (bio_bytein(bio)) {
+ return 1;
+ }
+ bio->ct = 0;
+ }
+ return 0;
}