walkero
/
openjpeg
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

update vor version 0.8

This commit is contained in:
Yannick Verschueren 2004-02-13 09:29:59 +00:00
parent a9cede2d5e
commit 28283c60ea
1 changed files with 55 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

98
libopenjpeg/bio.c
View File

@ -31,25 +31,28 @@
#include <stdio.h> #include <stdio.h>
#include <setjmp.h> #include <setjmp.h>
static unsigned char *bio_start, *bio_end, *bio_bp; static unsigned char *bio_start; /* pointer to the start of the buffer */
static unsigned int bio_buf; static unsigned char *bio_end; /* pointer to the end of the buffer */
static int bio_ct; 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 */
extern jmp_buf j2k_error; extern jmp_buf j2k_error;
/* <summary> */ /*
/* Number of bytes written. */ * Number of bytes written.
/* </summary> */ */
int bio_numbytes() int bio_numbytes()
{ {
return bio_bp - bio_start; return bio_bp - bio_start;
} }
/* <summary> */ /*
/* Init encoder. */ * Init encoder.
/* </summary> */ *
/* <param name="bp">Output buffer</param> */ * bp : Output buffer
/* <param name="len">Output buffer length</param> */ * len : Output buffer length
*/
void bio_init_enc(unsigned char *bp, int len) void bio_init_enc(unsigned char *bp, int len)
{ {
bio_start = bp; bio_start = bp;
@ -59,11 +62,12 @@ void bio_init_enc(unsigned char *bp, int len)
bio_ct = 8; bio_ct = 8;
} }
/* <summary> */ /*
/* Init decoder. */ * Init decoder.
/* </summary> */ *
/* <param name="bp">Input buffer</param> */ * bp : Input buffer
/* <param name="len">Input buffer length</param> */ * len : Input buffer length
*/
void bio_init_dec(unsigned char *bp, int len) void bio_init_dec(unsigned char *bp, int len)
{ {
bio_start = bp; bio_start = bp;
@ -73,9 +77,10 @@ void bio_init_dec(unsigned char *bp, int len)
bio_ct = 0; bio_ct = 0;
} }
/* <summary> */ /*
/* Write byte. --> function modified to eliminate longjmp !!! */ * Write byte. --> function modified to eliminate longjmp !!!
/* </summary> */ *
*/
int bio_byteout() int bio_byteout()
{ {
bio_buf = (bio_buf << 8) & 0xffff; bio_buf = (bio_buf << 8) & 0xffff;
@ -86,9 +91,10 @@ int bio_byteout()
return 0; return 0;
} }
/* <summary> */ /*
/* Read byte. --> function modified to eliminate longjmp !! */ * Read byte. --> function modified to eliminate longjmp !!
/* </summary> */ *
*/
int bio_bytein() int bio_bytein()
{ {
bio_buf = (bio_buf << 8) & 0xffff; bio_buf = (bio_buf << 8) & 0xffff;
@ -99,10 +105,11 @@ int bio_bytein()
return 0; return 0;
} }
/* <summary> */ /*
/* Write bit. */ * Write bit.
/* </summary> */ *
/* <param name="b">Bit to write (0 or 1)</param> */ * b : Bit to write (0 or 1)
*/
void bio_putbit(int b) void bio_putbit(int b)
{ {
if (bio_ct == 0) { if (bio_ct == 0) {
@ -112,9 +119,10 @@ void bio_putbit(int b)
bio_buf |= b << bio_ct; bio_buf |= b << bio_ct;
} }
/* <summary> */ /*
/* Read bit. */ * Read bit.
/* </summary> */ *
*/
int bio_getbit() int bio_getbit()
{ {
if (bio_ct == 0) { if (bio_ct == 0) {
@ -124,11 +132,12 @@ int bio_getbit()
return (bio_buf >> bio_ct) & 1; return (bio_buf >> bio_ct) & 1;
} }
/* <summary> */ /*
/* Write bits. */ * Write bits.
/* </summary> */ *
/* <param name="v">Value of bits</param> */ * v : Value of bits
/* <param name="n">Number of bits to write</param> */ * n : Number of bits to write
*/
void bio_write(int v, int n) void bio_write(int v, int n)
{ {
int i; int i;
@ -137,10 +146,11 @@ void bio_write(int v, int n)
} }
} }
/* <summary> */ /*
/* Read bits. */ * Read bits.
/* </summary> */ *
/* <param name="n">Number of bits to read</param> */ * n : Number of bits to read
*/
int bio_read(int n) int bio_read(int n)
{ {
int i, v; int i, v;
@ -151,9 +161,10 @@ int bio_read(int n)
return v; return v;
} }
/* <summary> */ /*
/* Flush bits. MOdified to eliminate longjmp !! */ * Flush bits. Modified to eliminate longjmp !!
/* </summary> */ *
*/
int bio_flush() int bio_flush()
{ {
bio_ct = 0; bio_ct = 0;
@ -168,8 +179,9 @@ int bio_flush()
return 0; return 0;
} }
/* <summary> */ /*
/* </summary> */ * Passes the ending bits (coming from flushing)
*/
int bio_inalign() int bio_inalign()
{ {
bio_ct = 0; bio_ct = 0;