/*
- * 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) 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) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
+ * Copyright (c) 2005, Herve Drolon, FreeImage Team
+ * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
*/
#include "bio.h"
-#include <stdio.h>
-#include <setjmp.h>
+#include "opj_malloc.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, OPJ_UINT32 b);
+/**
+Read a bit
+@param bio BIO handle
+@return Returns the read bit
+*/
+static OPJ_UINT32 bio_getbit(opj_bio_t *bio);
+/**
+Write a byte
+@param bio BIO handle
+@return Returns 0 if successful, returns 1 otherwise
+*/
+static bool bio_byteout(opj_bio_t *bio);
+/**
+Read a byte
+@param bio BIO handle
+@return Returns 0 if successful, returns 1 otherwise
+*/
+static bool bio_bytein(opj_bio_t *bio);
-static unsigned char *bio_start, *bio_end, *bio_bp;
-static unsigned int bio_buf;
-static int bio_ct;
+/*@}*/
-extern jmp_buf j2k_error;
+/*@}*/
-/* <summary> */
-/* Number of bytes written. */
-/* </summary> */
-int bio_numbytes()
-{
- return bio_bp - bio_start;
+/*
+==========================================================
+ local functions
+==========================================================
+*/
+
+static bool 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 true;
+ }
+ *bio->bp++ = bio->buf >> 8;
+ return false;
}
-/* <summary> */
-/* Init encoder. */
-/* </summary> */
-/* <param name="bp">Output buffer</param> */
-/* <param name="len">Output buffer length</param> */
-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 bool 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 true;
+ }
+ bio->buf |= *bio->bp++;
+ return false;
}
-/* <summary> */
-/* Init decoder. */
-/* </summary> */
-/* <param name="bp">Input buffer</param> */
-/* <param name="len">Input buffer length</param> */
-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, OPJ_UINT32 b) {
+ if (bio->ct == 0) {
+ bio_byteout(bio);
+ }
+ bio->ct--;
+ bio->buf |= b << bio->ct;
}
-/* <summary> */
-/* Write byte. --> function modified to eliminate longjmp !!! */
-/* </summary> */
-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 OPJ_UINT32 bio_getbit(opj_bio_t *bio) {
+ if (bio->ct == 0) {
+ bio_bytein(bio);
+ }
+ bio->ct--;
+ return (bio->buf >> bio->ct) & 1;
}
-/* <summary> */
-/* Read byte. --> function modified to eliminate longjmp !! */
-/* </summary> */
-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(void) {
+ opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
+ return bio;
}
-/* <summary> */
-/* Write bit. */
-/* </summary> */
-/* <param name="b">Bit to write (0 or 1)</param> */
-void bio_putbit(int b)
-{
- if (bio_ct == 0) {
- bio_byteout();
+void bio_destroy(opj_bio_t *bio) {
+ if(bio) {
+ opj_free(bio);
}
- bio_ct--;
- bio_buf |= b << bio_ct;
}
-/* <summary> */
-/* Read bit. */
-/* </summary> */
-int bio_getbit()
-{
- if (bio_ct == 0) {
- bio_bytein();
- }
- bio_ct--;
- return (bio_buf >> bio_ct) & 1;
+OPJ_UINT32 bio_numbytes(opj_bio_t *bio) {
+ return (bio->bp - bio->start);
+}
+
+void bio_init_enc(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len) {
+ bio->start = bp;
+ bio->end = bp + len;
+ bio->bp = bp;
+ bio->buf = 0;
+ bio->ct = 8;
+}
+
+void bio_init_dec(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len) {
+ bio->start = bp;
+ bio->end = bp + len;
+ bio->bp = bp;
+ bio->buf = 0;
+ bio->ct = 0;
}
-/* <summary> */
-/* Write bits. */
-/* </summary> */
-/* <param name="v">Value of bits</param> */
-/* <param name="n">Number of bits to write</param> */
-void bio_write(int v, int n)
-{
- int i;
- for (i = n - 1; i >= 0; i--) {
- bio_putbit((v >> i) & 1);
+void bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n) {
+ OPJ_UINT32 i;
+ for (i = n - 1; i != -1 ; --i) {
+ bio_putbit(bio, (v >> i) & 1);
}
}
-/* <summary> */
-/* Read bits. */
-/* </summary> */
-/* <param name="n">Number of bits to read</param> */
-int bio_read(int n)
-{
- int i, v;
+OPJ_UINT32 bio_read(opj_bio_t *bio, OPJ_UINT32 n) {
+ OPJ_UINT32 i, v;
v = 0;
- for (i = n - 1; i >= 0; i--) {
- v += bio_getbit() << i;
+ for (i = n - 1; i != -1 ; --i) {
+ v += bio_getbit(bio) << i;
}
return v;
}
-/* <summary> */
-/* Flush bits. MOdified to eliminate longjmp !! */
-/* </summary> */
-int bio_flush()
-{
- bio_ct = 0;
- if (bio_byteout())
- return 1;
- if (bio_ct == 7) {
- bio_ct = 0;
-
- if (bio_byteout())
- return 1;
+bool bio_flush(opj_bio_t *bio) {
+ bio->ct = 0;
+ if (bio_byteout(bio)) {
+ return true;
+ }
+ if (bio->ct == 7) {
+ bio->ct = 0;
+ if (bio_byteout(bio)) {
+ return true;
+ }
}
- return 0;
+ return false;
}
-/* <summary> */
-/* </summary> */
-int bio_inalign()
-{
- bio_ct = 0;
- if ((bio_buf & 0xff) == 0xff) {
- if (bio_bytein())
- return 1;
- bio_ct = 0;
+bool bio_inalign(opj_bio_t *bio) {
+ bio->ct = 0;
+ if ((bio->buf & 0xff) == 0xff) {
+ if (bio_bytein(bio)) {
+ return true;
+ }
+ bio->ct = 0;
}
- return 0;
+ return false;
}
projects / openjpeg.git / blobdiff