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
8 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
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37 @brief Implementation of an individual bit input-output (BIO)
39 The functions in BIO.C have for goal to realize an individual bit input - output.
42 /** @defgroup BIO BIO - Individual bit input-output stream */
46 Individual bit input-output stream (BIO)
48 typedef struct opj_bio {
49 /** pointer to the start of the buffer */
51 /** pointer to the end of the buffer */
53 /** pointer to the present position in the buffer */
55 /** temporary place where each byte is read or written */
57 /** coder : number of bits free to write. decoder : number of bits read */
61 /** @name Exported functions */
63 /* ----------------------------------------------------------------------- */
65 Create a new BIO handle
66 @return Returns a new BIO handle if successful, returns NULL otherwise
68 opj_bio_t* bio_create(void);
70 Destroy a previously created BIO handle
71 @param bio BIO handle to destroy
73 void bio_destroy(opj_bio_t *bio);
75 Number of bytes written.
77 @return Returns the number of bytes written
79 OPJ_UINT32 bio_numbytes(opj_bio_t *bio);
83 @param bp Output buffer
84 @param len Output buffer length
86 void bio_init_enc(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len);
90 @param bp Input buffer
91 @param len Input buffer length
93 void bio_init_dec(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len);
97 @param v Value of bits
98 @param n Number of bits to write
100 void bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n);
103 @param bio BIO handle
104 @param n Number of bits to read
105 @return Returns the corresponding read number
107 OPJ_UINT32 bio_read(opj_bio_t *bio, OPJ_UINT32 n);
110 @param bio BIO handle
111 @return Returns 1 if successful, returns 0 otherwise
113 bool bio_flush(opj_bio_t *bio);
115 Passes the ending bits (coming from flushing)
116 @param bio BIO handle
117 @return Returns 1 if successful, returns 0 otherwise
119 bool bio_inalign(opj_bio_t *bio);
120 /* ----------------------------------------------------------------------- */