2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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35 #include <stddef.h> /* ptrdiff_t */
39 @brief Implementation of an individual bit input-output (BIO)
41 The functions in BIO.C have for goal to realize an individual bit input - output.
44 /** @defgroup BIO BIO - Individual bit input-output stream */
48 Individual bit input-output stream (BIO)
50 typedef struct opj_bio {
51 /** pointer to the start of the buffer */
53 /** pointer to the end of the buffer */
55 /** pointer to the present position in the buffer */
57 /** temporary place where each byte is read or written */
59 /** coder : number of bits free to write. decoder : number of bits read */
63 /** @name Exported functions */
65 /* ----------------------------------------------------------------------- */
67 Create a new BIO handle
68 @return Returns a new BIO handle if successful, returns NULL otherwise
70 opj_bio_t* bio_create(void);
72 Destroy a previously created BIO handle
73 @param bio BIO handle to destroy
75 void bio_destroy(opj_bio_t *bio);
77 Number of bytes written.
79 @return Returns the number of bytes written
81 ptrdiff_t bio_numbytes(opj_bio_t *bio);
85 @param bp Output buffer
86 @param len Output buffer length
88 void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len);
92 @param bp Input buffer
93 @param len Input buffer length
95 void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len);
99 @param v Value of bits
100 @param n Number of bits to write
102 void bio_write(opj_bio_t *bio, int v, int n);
105 @param bio BIO handle
106 @param n Number of bits to read
107 @return Returns the corresponding read number
109 int bio_read(opj_bio_t *bio, int n);
112 @param bio BIO handle
113 @return Returns 1 if successful, returns 0 otherwise
115 int bio_flush(opj_bio_t *bio);
117 Passes the ending bits (coming from flushing)
118 @param bio BIO handle
119 @return Returns 1 if successful, returns 0 otherwise
121 int bio_inalign(opj_bio_t *bio);
122 /* ----------------------------------------------------------------------- */