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Diffstat (limited to 'openjpeg/src/lib/openjp2/bio.c')
| -rw-r--r-- | openjpeg/src/lib/openjp2/bio.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/openjpeg/src/lib/openjp2/bio.c b/openjpeg/src/lib/openjp2/bio.c new file mode 100644 index 000000000..5d4958017 --- /dev/null +++ b/openjpeg/src/lib/openjp2/bio.c @@ -0,0 +1,194 @@ +/* + * The copyright in this software is being made available under the 2-clauses + * BSD License, included below. This software may be subject to other third + * party and contributor rights, including patent rights, and no such rights + * are granted under this license. + * + * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium + * Copyright (c) 2002-2014, Professor Benoit Macq + * Copyright (c) 2001-2003, David Janssens + * Copyright (c) 2002-2003, Yannick Verschueren + * Copyright (c) 2003-2007, Francois-Olivier Devaux + * Copyright (c) 2003-2014, 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; +} |