/src/freeimage-svn/FreeImage/trunk/Source/LibOpenJPEG/bio.c

Source
/*
 * 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
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "opj_includes.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 opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b);
/**
Read a bit
@param bio BIO handle
@return Returns the read bit
*/
static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio);
/**
Write a byte
@param bio BIO handle
@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
*/
static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio);
/**
Read a byte
@param bio BIO handle
@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
*/
static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio);

/*@}*/

/*@}*/

/* 
==========================================================
   local functions
==========================================================
*/

OPJ_BOOL opj_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 OPJ_FALSE;
  }
  *bio->bp++ = (OPJ_BYTE)(bio->buf >> 8);
  return OPJ_TRUE;
}

OPJ_BOOL opj_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 OPJ_FALSE;
  }
  bio->buf |= *bio->bp++;
  return OPJ_TRUE;
}

void opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b) {
  if (bio->ct == 0) {
    opj_bio_byteout(bio); /* MSD: why not check the return value of this function ? */
  }
  bio->ct--;
  bio->buf |= b << bio->ct;
}

OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio) {
  if (bio->ct == 0) {
    opj_bio_bytein(bio); /* MSD: why not check the return value of this function ? */
  }
  bio->ct--;
  return (bio->buf >> bio->ct) & 1;
}

/* 
==========================================================
   Bit Input/Output interface
==========================================================
*/

opj_bio_t* opj_bio_create(void) {
  opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
  return bio;
}

void opj_bio_destroy(opj_bio_t *bio) {
  if(bio) {
    opj_free(bio);
  }
}

ptrdiff_t opj_bio_numbytes(opj_bio_t *bio) {
  return (bio->bp - bio->start);
}

void opj_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 opj_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;
}

void opj_bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n) {
  OPJ_UINT32 i;
  for (i = n - 1; i < n; i--) {
    opj_bio_putbit(bio, (v >> i) & 1);
  }
}

OPJ_UINT32 opj_bio_read(opj_bio_t *bio, OPJ_UINT32 n) {
  OPJ_UINT32 i;
    OPJ_UINT32 v;
  v = 0;
  for (i = n - 1; i < n; i--) {
    v += opj_bio_getbit(bio) << i;
  }
  return v;
}

OPJ_BOOL opj_bio_flush(opj_bio_t *bio) {
  bio->ct = 0;
  if (! opj_bio_byteout(bio)) {
    return OPJ_FALSE;
  }
  if (bio->ct == 7) {
    bio->ct = 0;
    if (! opj_bio_byteout(bio)) {
      return OPJ_FALSE;
    }
  }
  return OPJ_TRUE;
}

OPJ_BOOL opj_bio_inalign(opj_bio_t *bio) {
  bio->ct = 0;
  if ((bio->buf & 0xff) == 0xff) {
    if (! opj_bio_bytein(bio)) {
      return OPJ_FALSE;
    }
    bio->ct = 0;
  }
  return OPJ_TRUE;
}

Line	Count	Source
1		/*
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		* All rights reserved.
9		*
10		* Redistribution and use in source and binary forms, with or without
11		* modification, are permitted provided that the following conditions
12		* are met:
13		* 1. Redistributions of source code must retain the above copyright
14		* notice, this list of conditions and the following disclaimer.
15		* 2. Redistributions in binary form must reproduce the above copyright
16		* notice, this list of conditions and the following disclaimer in the
17		* documentation and/or other materials provided with the distribution.
18		*
19		* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20		* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22		* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23		* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24		* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25		* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26		* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27		* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28		* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29		* POSSIBILITY OF SUCH DAMAGE.
30		*/
31
32		#include "opj_includes.h"
33
34		/** @defgroup BIO BIO - Individual bit input-output stream */
35		/@{/
36
37		/** @name Local static functions */
38		/@{/
39
40		/**
41		Write a bit
42		@param bio BIO handle
43		@param b Bit to write (0 or 1)
44		*/
45		static void opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b);
46		/**
47		Read a bit
48		@param bio BIO handle
49		@return Returns the read bit
50		*/
51		static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio);
52		/**
53		Write a byte
54		@param bio BIO handle
55		@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
56		*/
57		static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio);
58		/**
59		Read a byte
60		@param bio BIO handle
61		@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
62		*/
63		static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio);
64
65		/@}/
66
67		/@}/
68
69		/*
70		==========================================================
71		local functions
72		==========================================================
73		*/
74
75	0	OPJ_BOOL opj_bio_byteout(opj_bio_t *bio) {
76	0	bio->buf = (bio->buf << 8) & 0xffff;
77	0	bio->ct = bio->buf == 0xff00 ? 7 : 8;
78	0	if (bio->bp >= bio->end) {
79	0	return OPJ_FALSE;
80	0	}
81	0	*bio->bp++ = (OPJ_BYTE)(bio->buf >> 8);
82	0	return OPJ_TRUE;
83	0	}
84
85	0	OPJ_BOOL opj_bio_bytein(opj_bio_t *bio) {
86	0	bio->buf = (bio->buf << 8) & 0xffff;
87	0	bio->ct = bio->buf == 0xff00 ? 7 : 8;
88	0	if (bio->bp >= bio->end) {
89	0	return OPJ_FALSE;
90	0	}
91	0	bio->buf \|= *bio->bp++;
92	0	return OPJ_TRUE;
93	0	}
94
95	0	void opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b) {
96	0	if (bio->ct == 0) {
97	0	opj_bio_byteout(bio); /* MSD: why not check the return value of this function ? */
98	0	}
99	0	bio->ct--;
100	0	bio->buf \|= b << bio->ct;
101	0	}
102
103	0	OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio) {
104	0	if (bio->ct == 0) {
105	0	opj_bio_bytein(bio); /* MSD: why not check the return value of this function ? */
106	0	}
107	0	bio->ct--;
108	0	return (bio->buf >> bio->ct) & 1;
109	0	}
110
111		/*
112		==========================================================
113		Bit Input/Output interface
114		==========================================================
115		*/
116
117	0	opj_bio_t* opj_bio_create(void) {
118	0	opj_bio_t bio = (opj_bio_t)opj_malloc(sizeof(opj_bio_t));
119	0	return bio;
120	0	}
121
122	0	void opj_bio_destroy(opj_bio_t *bio) {
123	0	if(bio) {
124	0	opj_free(bio);
125	0	}
126	0	}
127
128	0	ptrdiff_t opj_bio_numbytes(opj_bio_t *bio) {
129	0	return (bio->bp - bio->start);
130	0	}
131
132	0	void opj_bio_init_enc(opj_bio_t bio, OPJ_BYTE bp, OPJ_UINT32 len) {
133	0	bio->start = bp;
134	0	bio->end = bp + len;
135	0	bio->bp = bp;
136	0	bio->buf = 0;
137	0	bio->ct = 8;
138	0	}
139
140	0	void opj_bio_init_dec(opj_bio_t bio, OPJ_BYTE bp, OPJ_UINT32 len) {
141	0	bio->start = bp;
142	0	bio->end = bp + len;
143	0	bio->bp = bp;
144	0	bio->buf = 0;
145	0	bio->ct = 0;
146	0	}
147
148	0	void opj_bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n) {
149	0	OPJ_UINT32 i;
150	0	for (i = n - 1; i < n; i--) {
151	0	opj_bio_putbit(bio, (v >> i) & 1);
152	0	}
153	0	}
154
155	0	OPJ_UINT32 opj_bio_read(opj_bio_t *bio, OPJ_UINT32 n) {
156	0	OPJ_UINT32 i;
157	0	OPJ_UINT32 v;
158	0	v = 0;
159	0	for (i = n - 1; i < n; i--) {
160	0	v += opj_bio_getbit(bio) << i;
161	0	}
162	0	return v;
163	0	}
164
165	0	OPJ_BOOL opj_bio_flush(opj_bio_t *bio) {
166	0	bio->ct = 0;
167	0	if (! opj_bio_byteout(bio)) {
168	0	return OPJ_FALSE;
169	0	}
170	0	if (bio->ct == 7) {
171	0	bio->ct = 0;
172	0	if (! opj_bio_byteout(bio)) {
173	0	return OPJ_FALSE;
174	0	}
175	0	}
176	0	return OPJ_TRUE;
177	0	}
178
179	0	OPJ_BOOL opj_bio_inalign(opj_bio_t *bio) {
180	0	bio->ct = 0;
181	0	if ((bio->buf & 0xff) == 0xff) {
182	0	if (! opj_bio_bytein(bio)) {
183	0	return OPJ_FALSE;
184	0	}
185	0	bio->ct = 0;
186	0	}
187	0	return OPJ_TRUE;
188	0	}

Coverage Report

Created: 2025-10-28 06:24