/*
- * Copyright (c) 2001-2002, David Janssens
- * Copyright (c) 2003, Yannick Verschueren
- * Copyright (c) 2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
- *
+ * 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
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGE.
*/
-#include "bio.h"
-#include <stdio.h>
-#include <setjmp.h>
+#include "opj_includes.h"
-static unsigned char *bio_start; /* pointer to the start of the buffer */
-static unsigned char *bio_end; /* pointer to the end of the buffer */
-static unsigned char *bio_bp; /* pointer to the present position in the buffer */
-static unsigned int bio_buf; /* temporary place where each byte is read or written */
-static int bio_ct; /* coder : number of bits free to write // decoder : number of bits read */
+/** @defgroup BIO BIO - Individual bit input-output stream */
+/*@{*/
-extern jmp_buf j2k_error;
+/** @name Local static functions */
+/*@{*/
-/*
- * Number of bytes written.
- */
-int bio_numbytes()
-{
- return bio_bp - bio_start;
+/**
+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;
}
-/*
- * Init encoder.
- *
- * bp : Output buffer
- * len : Output buffer length
- */
-void bio_init_enc(unsigned char *bp, int len)
-{
- bio_start = bp;
- bio_end = bp + len;
- bio_bp = bp;
- bio_buf = 0;
- bio_ct = 8;
+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;
}
-/*
- * Init decoder.
- *
- * bp : Input buffer
- * len : Input buffer length
- */
-void bio_init_dec(unsigned char *bp, int len)
-{
- bio_start = bp;
- bio_end = bp + len;
- bio_bp = bp;
- bio_buf = 0;
- bio_ct = 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;
}
-/*
- * Write byte. --> function modified to eliminate longjmp !!!
- *
- */
-int bio_byteout()
-{
- 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_getbit(opj_bio_t *bio) {
+ if (bio->ct == 0) {
+ bio_bytein(bio);
+ }
+ bio->ct--;
+ return (bio->buf >> bio->ct) & 1;
}
-/*
- * Read byte. --> function modified to eliminate longjmp !!
- *
- */
-int bio_bytein()
-{
- 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;
+/*
+==========================================================
+ Bit Input/Output interface
+==========================================================
+*/
+
+opj_bio_t* bio_create() {
+ opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
+ return bio;
}
-/*
- * Write bit.
- *
- * b : Bit to write (0 or 1)
- */
-void bio_putbit(int b)
-{
- if (bio_ct == 0) {
- bio_byteout();
- }
- bio_ct--;
- bio_buf |= b << bio_ct;
+void bio_destroy(opj_bio_t *bio) {
+ if(bio) {
+ opj_free(bio);
+ }
}
-/*
- * Read bit.
- *
- */
-int bio_getbit()
-{
- if (bio_ct == 0) {
- bio_bytein();
- }
- bio_ct--;
- return (bio_buf >> bio_ct) & 1;
+int bio_numbytes(opj_bio_t *bio) {
+ return (bio->bp - bio->start);
}
-/*
- * Write bits.
- *
- * v : Value of bits
- * n : Number of bits to write
- */
-void bio_write(int v, int n)
-{
- int i;
- for (i = n - 1; i >= 0; i--) {
- bio_putbit((v >> i) & 1);
- }
+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;
}
-/*
- * Read bits.
- *
- * n : Number of bits to read
- */
-int bio_read(int n)
-{
- int i, v;
- v = 0;
- for (i = n - 1; i >= 0; i--) {
- v += bio_getbit() << i;
- }
- return v;
+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;
}
-/*
- * Flush bits. Modified to eliminate longjmp !!
- *
- */
-int bio_flush()
-{
- bio_ct = 0;
- if (bio_byteout())
- return 1;
- if (bio_ct == 7) {
- bio_ct = 0;
-
- if (bio_byteout())
- return 1;
- }
- return 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);
+ }
}
-/*
- * Passes the ending bits (coming from flushing)
- */
-int bio_inalign()
-{
- bio_ct = 0;
- if ((bio_buf & 0xff) == 0xff) {
- if (bio_bytein())
- return 1;
- bio_ct = 0;
- }
- return 0;
+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 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;
+}
+
+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;
}
projects / openjpeg.git / blobdiff