diff options
Diffstat (limited to 'src/libjasper/base/jas_tvp.c')
| -rw-r--r-- | src/libjasper/base/jas_tvp.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/libjasper/base/jas_tvp.c b/src/libjasper/base/jas_tvp.c new file mode 100644 index 0000000..4c23476 --- /dev/null +++ b/src/libjasper/base/jas_tvp.c @@ -0,0 +1,237 @@ +/* + * Copyright (c) 2001-2002 Michael David Adams. + * All rights reserved. + */ + +/* __START_OF_JASPER_LICENSE__ + * + * JasPer License Version 2.0 + * + * Copyright (c) 2001-2006 Michael David Adams + * Copyright (c) 1999-2000 Image Power, Inc. + * Copyright (c) 1999-2000 The University of British Columbia + * + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person (the + * "User") obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, and/or sell copies of the Software, and to permit + * persons to whom the Software is furnished to do so, subject to the + * following conditions: + * + * 1. The above copyright notices and this permission notice (which + * includes the disclaimer below) shall be included in all copies or + * substantial portions of the Software. + * + * 2. The name of a copyright holder shall not be used to endorse or + * promote products derived from the Software without specific prior + * written permission. + * + * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS + * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER + * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS + * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING + * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL + * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING + * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION + * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE + * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE + * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY. + * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS + * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL + * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS + * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE + * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE + * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL + * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES, + * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL + * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH + * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH, + * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH + * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY + * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. + * + * __END_OF_JASPER_LICENSE__ + */ + +/* + * Tag-Value Parser Library + * + * $Id: jas_tvp.c,v 1.1 2008/10/17 06:14:59 scuri Exp $ + */ + +/******************************************************************************\ +* Includes. +\******************************************************************************/ + +#include <assert.h> +#include <stdio.h> +#include <ctype.h> +#include <stdlib.h> + +#include "jasper/jas_malloc.h" +#include "jasper/jas_string.h" +#include "jasper/jas_tvp.h" + +/******************************************************************************\ +* Macros. +\******************************************************************************/ + +/* Is the specified character valid for a tag name? */ +#define JAS_TVP_ISTAG(x) \ + (isalpha(x) || (x) == '_' || isdigit(x)) + +/******************************************************************************\ +* Code for creating and destroying a tag-value parser. +\******************************************************************************/ + +jas_tvparser_t *jas_tvparser_create(const char *s) +{ + jas_tvparser_t *tvp; + if (!(tvp = jas_malloc(sizeof(jas_tvparser_t)))) { + return 0; + } + if (!(tvp->buf = jas_strdup(s))) { + jas_tvparser_destroy(tvp); + return 0; + } + tvp->pos = tvp->buf; + tvp->tag = 0; + tvp->val = 0; + return tvp; +} + +void jas_tvparser_destroy(jas_tvparser_t *tvp) +{ + if (tvp->buf) { + jas_free(tvp->buf); + } + jas_free(tvp); +} + +/******************************************************************************\ +* Main parsing code. +\******************************************************************************/ + +/* Get the next tag-value pair. */ +int jas_tvparser_next(jas_tvparser_t *tvp) +{ + char *p; + char *tag; + char *val; + + /* Skip any leading whitespace. */ + p = tvp->pos; + while (*p != '\0' && isspace(*p)) { + ++p; + } + + /* Has the end of the input data been reached? */ + if (*p == '\0') { + /* No more tags are present. */ + tvp->pos = p; + return 1; + } + + /* Does the tag name begin with a valid character? */ + if (!JAS_TVP_ISTAG(*p)) { + return -1; + } + + /* Remember where the tag name begins. */ + tag = p; + + /* Find the end of the tag name. */ + while (*p != '\0' && JAS_TVP_ISTAG(*p)) { + ++p; + } + + /* Has the end of the input data been reached? */ + if (*p == '\0') { + /* The value field is empty. */ + tvp->tag = tag; + tvp->val = ""; + tvp->pos = p; + return 0; + } + + /* Is a value field not present? */ + if (*p != '=') { + if (*p != '\0' && !isspace(*p)) { + return -1; + } + *p++ = '\0'; + tvp->tag = tag; + tvp->val = ""; + tvp->pos = p; + return 0; + } + + *p++ = '\0'; + + val = p; + while (*p != '\0' && !isspace(*p)) { + ++p; + } + + if (*p != '\0') { + *p++ = '\0'; + } + + tvp->pos = p; + tvp->tag = tag; + tvp->val = val; + + return 0; +} + +/******************************************************************************\ +* Code for querying the current tag/value. +\******************************************************************************/ + +/* Get the current tag. */ +char *jas_tvparser_gettag(jas_tvparser_t *tvp) +{ + return tvp->tag; +} + +/* Get the current value. */ +char *jas_tvparser_getval(jas_tvparser_t *tvp) +{ + return tvp->val; +} + +/******************************************************************************\ +* Miscellaneous code. +\******************************************************************************/ + +/* Lookup a tag by name. */ +jas_taginfo_t *jas_taginfos_lookup(jas_taginfo_t *taginfos, const char *name) +{ + jas_taginfo_t *taginfo; + taginfo = taginfos; + while (taginfo->id >= 0) { + if (!strcmp(taginfo->name, name)) { + return taginfo; + } + ++taginfo; + } + return 0; +} + +/* This function is simply for convenience. */ +/* One can avoid testing for the special case of a null pointer, by + using this function. This function never returns a null pointer. */ +jas_taginfo_t *jas_taginfo_nonull(jas_taginfo_t *taginfo) +{ + static jas_taginfo_t invalidtaginfo = { + -1, 0 + }; + + return taginfo ? taginfo : &invalidtaginfo; +} |