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audacity/lib-src/libraptor/src/raptor_rfc2396.c
ra 58caf78a86 Move library tree where it belongs
2010-01-24 09:19:39 +00:00

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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* raptor_rfc2396.c - Raptor URI resolving from RFC2396 and RFC3986
*
* Copyright (C) 2004-2008, David Beckett http://purl.org/net/dajobe/
* Copyright (C) 2004-2004, University of Bristol, UK http://www.bristol.ac.uk/
*
* This package is Free Software and part of Redland http://librdf.org/
*
* It is licensed under the following three licenses as alternatives:
* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
* 2. GNU General Public License (GPL) V2 or any newer version
* 3. Apache License, V2.0 or any newer version
*
* You may not use this file except in compliance with at least one of
* the above three licenses.
*
* See LICENSE.html or LICENSE.txt at the top of this package for the
* complete terms and further detail along with the license texts for
* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <raptor_config.h>
#endif
#ifdef WIN32
#include <win32_raptor_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
/* Raptor includes */
#include "raptor.h"
#include "raptor_internal.h"
#ifndef STANDALONE
/**
* raptor_new_uri_detail:
* @uri_string: The URI string to split
*
* Create a URI detailed structure from a URI string.
*
**/
raptor_uri_detail*
raptor_new_uri_detail(const unsigned char *uri_string)
{
const unsigned char *s = NULL;
unsigned char *b = NULL;
raptor_uri_detail *ud;
size_t uri_len;
if(!uri_string)
return NULL;
uri_len=strlen((const char*)uri_string);
/* The extra +5 is for the 5 \0s that may be added for each component
* even if the entire URI is empty
*/
ud=(raptor_uri_detail*)RAPTOR_CALLOC(raptor_uri_detail,
sizeof(raptor_uri_detail)+uri_len+5+1,
1);
if(!ud)
return NULL;
ud->uri_len=uri_len;
ud->buffer=(unsigned char*)((unsigned char*)ud + sizeof(raptor_uri_detail));
s=uri_string;
b=ud->buffer;
/* Split the URI into it's syntactic components */
/*
* scheme is checked in more detail since it is important
* to recognise absolute URIs for resolving, and it is easy to do.
*
* scheme = alpha *( alpha | digit | "+" | "-" | "." )
* RFC 2396 section 3.1 Scheme Component
*/
if(*s && isalpha((int)*s)) {
s++;
while(*s && (isalnum((int)*s) ||
(*s == '+') || (*s == '-') || (*s == '.')))
s++;
if(*s == ':') {
/* it matches the URI scheme grammar, so store this as a scheme */
ud->scheme=b;
ud->scheme_len=s-uri_string;
while(*uri_string != ':')
*b++ = *uri_string++;
*b++ = '\0';
/* and move past the : */
s++;
} else
s=uri_string;
}
/* authority */
if(*s && s[1] && *s == '/' && s[1] == '/') {
ud->authority=b;
s+=2; /* skip "//" */
while(*s && *s != '/' && *s != '?' && *s != '#')
*b++ = *s++;
ud->authority_len=b-ud->authority;
*b++ = '\0';
}
/* path */
if(*s && *s != '?' && *s != '#') {
ud->path=b;
while(*s && *s != '?' && *s != '#')
*b++ = *s++;
ud->path_len=b-ud->path;
*b++ = '\0';
}
/* query */
if(*s && *s == '?') {
ud->query=b;
s++;
while(*s && *s != '#')
*b++ = *s++;
ud->query_len=b-ud->query;
*b++ = '\0';
}
/* fragment identifier - RFC2396 Section 4.1 */
if(*s && *s == '#') {
ud->fragment=b;
s++;
while(*s)
*b++ = *s++;
ud->fragment_len=b-ud->fragment;
*b='\0';
}
ud->is_hierarchical=(ud->path && *ud->path == '/');
return ud;
}
void
raptor_free_uri_detail(raptor_uri_detail* uri_detail)
{
/* Also frees the uri_detail->buffer allocated in raptor_uri_parse() */
RAPTOR_FREE(raptor_uri_detail, uri_detail);
}
unsigned char*
raptor_uri_detail_to_string(raptor_uri_detail *ud, size_t* len_p)
{
size_t len=0;
unsigned char *buffer, *p;
if(ud->scheme)
len+= ud->scheme_len+1; /* : */
if(ud->authority)
len+= 2 + ud->authority_len; /* // */
if(ud->path)
len+= ud->path_len;
if(ud->fragment)
len+= 1 + ud->fragment_len; /* # */
if(ud->query)
len+= 1 + ud->query_len; /* ? */
if(len_p)
*len_p=len;
buffer=(unsigned char*)RAPTOR_MALLOC(cstring, len+1);
if(!buffer)
return NULL;
p=buffer;
if(ud->scheme) {
unsigned char *src=ud->scheme;
while(*src)
*p++ = *src++;
*p++ = ':';
}
if(ud->authority) {
unsigned char *src=ud->authority;
*p++ = '/';
*p++ = '/';
while(*src)
*p++ = *src++;
}
if(ud->path) {
unsigned char *src=ud->path;
while(*src)
*p++ = *src++;
}
if(ud->fragment) {
unsigned char *src=ud->fragment;
*p++ = '#';
while(*src)
*p++ = *src++;
}
if(ud->query) {
unsigned char *src=ud->query;
*p++ = '?';
while(*src)
*p++ = *src++;
}
*p='\0';
return buffer;
}
/**
* raptor_uri_resolve_uri_reference:
* @base_uri: Base URI string
* @reference_uri: Reference URI string
* @buffer: Destination buffer URI
* @length: Length of destination buffer
*
* Resolve a URI to a base URI.
*
**/
void
raptor_uri_resolve_uri_reference(const unsigned char *base_uri,
const unsigned char *reference_uri,
unsigned char *buffer, size_t length)
{
raptor_uri_detail *ref=NULL;
raptor_uri_detail *base=NULL;
raptor_uri_detail result; /* static - pointers go to inside ref or base */
unsigned char *path_buffer=NULL;
unsigned char *p, *cur, *prev, *s;
unsigned char last_char;
#if RAPTOR_DEBUG > 2
RAPTOR_DEBUG4("base uri='%s', reference_uri='%s, buffer size %d\n",
(base_uri ? (const char*)base_uri : "NULL"),
(reference_uri ? (const char*)reference_uri : "NULL"),
(int)length);
#endif
*buffer = '\0';
memset(&result, 0, sizeof(result));
ref=raptor_new_uri_detail(reference_uri);
if(!ref)
goto resolve_tidy;
/* is reference URI "" or "#frag"? */
if(!ref->scheme && !ref->authority && !ref->path && !ref->query) {
unsigned char c;
/* Copy base URI to result up to '\0' or '#' */
for(p=buffer; (c= *base_uri) && c != '#'; p++, base_uri++)
*p = c;
*p='\0';
if(ref->fragment) {
unsigned char *src=ref->fragment;
/* Append any fragment */
*p++ = '#';
while(*src)
*p++ = *src++;
*p='\0';
}
goto resolve_tidy;
}
/* reference has a scheme - is an absolute URI */
if(ref->scheme) {
strncpy((char*)buffer, (const char*)reference_uri, ref->uri_len+1);
goto resolve_tidy;
}
/* now the reference URI must be schemeless, i.e. relative */
base=raptor_new_uri_detail(base_uri);
if(!base)
goto resolve_tidy;
/* result URI must be of the base URI scheme */
result.scheme = base->scheme;
result.scheme_len = base->scheme_len;
/* an authority is given ( [user:pass@]hostname[:port] for http)
* so the reference URI is like //authority
*/
if(ref->authority) {
result.authority = ref->authority;
result.authority_len = ref->authority_len;
result.path = ref->path;
result.path_len = ref->path_len;
goto resolve_end;
}
/* no - so now we have path (maybe with query, fragment) relative to base */
result.authority = base->authority;
result.authority_len = base->authority_len;
if(ref->is_hierarchical || !base->is_hierarchical) {
/* if the reference path is absolute OR the base URI
* is a non-hierarchical URI then just copy the reference path
* to the result.
*/
result.path = ref->path;
result.path_len = ref->path_len;
goto resolve_end;
}
/* need to resolve relative path */
/* Build the result path in path_buffer */
result.path_len=0;
if(base->path)
result.path_len += base->path_len;
else {
/* Add a missing path - makes the base URI 1 character longer */
base->path=(unsigned char*)"/"; /* static, but copied and not free()d */
base->path_len=1;
base->uri_len++;
result.path_len++;
}
if(ref->path)
result.path_len += ref->path_len;
/* the resulting path can be no longer than result.path_len */
path_buffer=(unsigned char*)RAPTOR_MALLOC(cstring, result.path_len+1);
if(!path_buffer)
goto resolve_tidy;
result.path = path_buffer;
*path_buffer = '\0';
for(p=base->path + base->path_len-1; p > base->path && *p != '/'; p--)
;
if(p >= base->path) {
result.path_len=p-base->path+1;
/* Found a /, copy everything before that to path_buffer */
strncpy((char*)path_buffer, (char*)base->path, result.path_len);
path_buffer[result.path_len]='\0';
}
if(ref->path) {
strncpy((char*)path_buffer+result.path_len, (const char*)ref->path, ref->path_len+1);
result.path_len += ref->path_len;
path_buffer[result.path_len]='\0';
}
/* remove all "./" path components */
for(p=(prev=path_buffer); *p; p++) {
if(*p != '/')
continue;
if(p == (prev+1) && *prev == '.') {
unsigned char *dest=prev;
p++;
while(*dest)
*dest++ = *p++;
*dest= '\0';
p=prev;
result.path_len -=2;
if(!*p)
break;
} else {
prev=p+1;
}
}
if(p == (prev+1) && *prev == '.') {
/* Remove "." at the end of a path */
*prev = '\0';
result.path_len--;
}
#if defined(RAPTOR_DEBUG)
if(result.path_len != strlen((const char*)path_buffer))
RAPTOR_FATAL3("Path length %ld does not match calculated %ld.", (long)strlen((const char*)path_buffer), (long)result.path_len);
#endif
/* Remove all "<component>/../" path components */
/*
* The pointers:
* <component>/../<next>
* prev-^ cur-^
* and p points to the previous prev (can be NULL)
*/
prev=NULL;
cur=NULL;
p=NULL;
last_char='\0';
for(s=path_buffer; *s; last_char=*s++) {
/* find the path components */
if(*s != '/') {
/* If it is the start or following a /, record a new path component */
if(!last_char || last_char == '/') {
/* Store 2 path components */
if(!prev)
prev=s;
else if(!cur)
cur=s;
}
continue;
}
/* Wait till there are two path components */
if(!prev || !cur)
continue;
#if defined(RAPTOR_DEBUG)
if(result.path_len != strlen((const char*)path_buffer))
RAPTOR_FATAL3("Path length %ld does not match calculated %ld.", (long)strlen((const char*)path_buffer), (long)result.path_len);
#endif
/* If the current one is '..' */
if(s == (cur+2) && cur[0] == '.' && cur[1] == '.') {
/* and if the previous one isn't '..'
* (which means it is beyond the root such as a path "/foo/../..")
*/
if(cur != (prev+3) || prev[0] != '.' || prev[1] != '.') {
unsigned char *dest=prev;
/* remove the <component>/../<next>
* prev-^ cur-^ ^-s
*/
size_t len=s-prev+1; /* length of path component we are removing */
s++;
while(*s)
*dest++ = *s++;
*dest = '\0';
result.path_len -= len;
if(p && p < prev) {
/* We know the previous prev path component and we didn't do
* two adjustments in a row, so can adjust the
* pointers to continue the newly shortened path:
* s to the / before <next> (autoincremented by the loop)
* prev to the previous prev path component
* cur to NULL. Will be set by the next loop iteration since s
* points to a '/', last_char will be set to *s. */
s=prev-1;
prev=p;
cur=NULL;
p=NULL;
} else {
/* Otherwise must start from the beginning again */
prev=NULL;
cur=NULL;
p=NULL;
last_char='\0';
s=path_buffer;
}
}
} else {
/* otherwise this is not a special path component so
* shift the path components stack
*/
p=prev;
prev=cur;
cur=NULL;
}
}
if(prev && s == (cur+2) && cur[0] == '.' && cur[1] == '.') {
/* Remove <component>/.. at the end of the path */
*prev = '\0';
result.path_len -= (s-prev);
}
#if defined(RAPTOR_DEBUG)
if(result.path_len != strlen((const char*)path_buffer))
RAPTOR_FATAL3("Path length %ld does not match calculated %ld.", (long)strlen((const char*)path_buffer), (long)result.path_len);
#endif
resolve_end:
/* RFC3986 Appendix C.2 / 5.4.2 Abnormal Examples
* Remove leading /../ and /./
*/
for(p=result.path; p; ) {
if(!strncmp((const char *)p, "/../", 4)) {
result.path_len -= 3;
memcpy(p, p+3, result.path_len+1);
} else if(!strncmp((const char *)p, "/./", 3)) {
result.path_len -= 2;
memcpy(p, p+2, result.path_len+1);
} else
break;
}
if(ref->query) {
result.query=ref->query;
result.query_len=ref->query_len;
}
if(ref->fragment) {
result.fragment=ref->fragment;
result.fragment_len=ref->fragment_len;
}
p=buffer;
if(result.scheme) {
strncpy((char*)p, (const char*)result.scheme, result.scheme_len);
p += result.scheme_len;
*p++ = ':';
}
if(result.authority) {
*p++ = '/';
*p++ = '/';
strncpy((char*)p, (const char*)result.authority, result.authority_len);
p+= result.authority_len;
}
if(result.path) {
strncpy((char*)p, (const char*)result.path, result.path_len);
p+= result.path_len;
}
if(result.query) {
*p++ = '?';
strncpy((char*)p, (const char*)result.query, result.query_len);
p+= result.query_len;
}
if(result.fragment) {
*p++ = '#';
strncpy((char*)p, (const char*)result.fragment, result.fragment_len);
p+= result.fragment_len;
}
*p = '\0';
resolve_tidy:
if(path_buffer)
RAPTOR_FREE(cstring, path_buffer);
if(base)
raptor_free_uri_detail(base);
if(ref)
raptor_free_uri_detail(ref);
}
#endif
#ifdef STANDALONE
#include <stdio.h>
/* one more prototype */
int main(int argc, char *argv[]);
static const char *program;
static int
check_resolve(const char *base_uri, const char *reference_uri,
const char *result_uri)
{
unsigned char buffer[1024];
raptor_uri_resolve_uri_reference((const unsigned char*)base_uri,
(const unsigned char*)reference_uri,
buffer, sizeof (buffer));
if(strcmp((const char*)buffer, result_uri)) {
fprintf(stderr,
"%s: raptor_uri_resolve_uri_reference(%s, %s) FAILED giving '%s' != '%s'\n",
program, base_uri, reference_uri,
buffer, result_uri);
return 1;
}
#if RAPTOR_DEBUG > 2
fprintf(stderr,
"%s: raptor_uri_resolve_uri_reference(%s, %s) OK giving '%s'\n",
program, base_uri, reference_uri,
buffer);
#endif
return 0;
}
static int
check_parses(const char *uri_string) {
raptor_uri_detail* ud;
ud=raptor_new_uri_detail((unsigned const char*)uri_string);
if(!ud) {
fprintf(stderr, "%s: raptor_new_uri_detail(%s) FAILED to parse\n",
program, uri_string);
return 1;
}
#if RAPTOR_DEBUG > 2
fprintf(stderr, "%s: raptor_new_uri_detail(%s) OK\n",
program, uri_string);
#endif
raptor_free_uri_detail(ud);
return 0;
}
int
main(int argc, char *argv[])
{
const char *base_uri="http://example.org/bpath/cpath/d;p?querystr#frag";
int failures=0;
program=raptor_basename(argv[0]);
fprintf(stderr, "%s: Using base URI '%s'\n", program, base_uri);
/* Tests from RFC2396 Appendix C
* and RFC3986 Section 5
*
* Modifications:
* - add 'path' when items are path components to make easier to read
* - use example.org instead of 'a' for the authority
* - results are against the base_uri above
*/
/* Appendix C.1 / 5.4.1 Normal Examples */
failures += check_resolve(base_uri, "g:h", "g:h");
failures += check_resolve(base_uri, "gpath", "http://example.org/bpath/cpath/gpath");
failures += check_resolve(base_uri, "./gpath", "http://example.org/bpath/cpath/gpath");
failures += check_resolve(base_uri, "gpath/", "http://example.org/bpath/cpath/gpath/");
failures += check_resolve(base_uri, "/gpath", "http://example.org/gpath");
failures += check_resolve(base_uri, "//gpath", "http://gpath");
failures += check_resolve(base_uri, "?y", "http://example.org/bpath/cpath/?y");
failures += check_resolve(base_uri, "gpath?y", "http://example.org/bpath/cpath/gpath?y");
failures += check_resolve(base_uri, "#s", "http://example.org/bpath/cpath/d;p?querystr#s");
failures += check_resolve(base_uri, "gpath#s", "http://example.org/bpath/cpath/gpath#s");
failures += check_resolve(base_uri, "gpath?y#s", "http://example.org/bpath/cpath/gpath?y#s");
failures += check_resolve(base_uri, ";x", "http://example.org/bpath/cpath/;x");
failures += check_resolve(base_uri, "gpath;x", "http://example.org/bpath/cpath/gpath;x");
failures += check_resolve(base_uri, "gpath;x?y#s", "http://example.org/bpath/cpath/gpath;x?y#s");
failures += check_resolve(base_uri, ".", "http://example.org/bpath/cpath/");
failures += check_resolve(base_uri, "./", "http://example.org/bpath/cpath/");
failures += check_resolve(base_uri, "..", "http://example.org/bpath/");
failures += check_resolve(base_uri, "../", "http://example.org/bpath/");
failures += check_resolve(base_uri, "../gpath", "http://example.org/bpath/gpath");
failures += check_resolve(base_uri, "../..", "http://example.org/");
failures += check_resolve(base_uri, "../../", "http://example.org/");
failures += check_resolve(base_uri, "../../gpath", "http://example.org/gpath");
/* Appendix C.2 / 5.4.2 Abnormal Examples */
failures += check_resolve(base_uri, "", "http://example.org/bpath/cpath/d;p?querystr"); /* This is a Normal Example in RFC 3986 */
failures += check_resolve(base_uri, "../../../gpath", "http://example.org/gpath"); /* RFC 3986 changed the answer here */
failures += check_resolve(base_uri, "../../../../gpath", "http://example.org/gpath"); /* RFC 3986 changed the answer here */
failures += check_resolve(base_uri, "/./gpath", "http://example.org/gpath"); /* RFC 3986 changed the answer here */
failures += check_resolve(base_uri, "/../gpath", "http://example.org/gpath"); /* RFC 3986 changed the answer here */
failures += check_resolve(base_uri, "gpath.", "http://example.org/bpath/cpath/gpath.");
failures += check_resolve(base_uri, ".gpath", "http://example.org/bpath/cpath/.gpath");
failures += check_resolve(base_uri, "gpath..", "http://example.org/bpath/cpath/gpath..");
failures += check_resolve(base_uri, "..gpath", "http://example.org/bpath/cpath/..gpath");
failures += check_resolve(base_uri, "./../gpath", "http://example.org/bpath/gpath");
failures += check_resolve(base_uri, "./gpath/.", "http://example.org/bpath/cpath/gpath/");
failures += check_resolve(base_uri, "gpath/./hpath", "http://example.org/bpath/cpath/gpath/hpath");
failures += check_resolve(base_uri, "gpath/../hpath", "http://example.org/bpath/cpath/hpath");
failures += check_resolve(base_uri, "gpath;x=1/./y", "http://example.org/bpath/cpath/gpath;x=1/y");
failures += check_resolve(base_uri, "gpath;x=1/../y", "http://example.org/bpath/cpath/y");
failures += check_resolve(base_uri, "gpath?y/./x", "http://example.org/bpath/cpath/gpath?y/./x");
failures += check_resolve(base_uri, "gpath?y/../x", "http://example.org/bpath/cpath/gpath?y/../x");
failures += check_resolve(base_uri, "gpath#s/./x", "http://example.org/bpath/cpath/gpath#s/./x");
failures += check_resolve(base_uri, "gpath#s/../x", "http://example.org/bpath/cpath/gpath#s/../x");
/* RFC 3986 makes this the strict answer but also allows
* http://example.org/bpath/cpath/gauthority
* for backward compatibility
*/
failures += check_resolve(base_uri, "http:gauthority", "http:gauthority");
/* Examples from 1.3 */
failures += check_parses("ftp://ftp.is.co.za/rfc/rfc1808.txt");
failures += check_parses("gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles");
failures += check_parses("http://www.math.uio.no/faq/compression-faq/part1.html");
failures += check_parses("mailto:mduerst@ifi.unizh.ch");
failures += check_parses("news:comp.infosystems.www.servers.unix");
failures += check_parses("telnet://melvyl.ucop.edu/");
failures += check_parses("");
/* This is a not-crashing test */
raptor_new_uri_detail(NULL);
/* Extra checks not in RFC2396 */
/* RDF xml:base check that fragments and query strings are removed */
failures += check_resolve(base_uri, "gpath/../../../hpath", "http://example.org/hpath");
/* RFC3986 changed the answer to this test
* Was "RDF xml:base check that extra ../ are not lost"
* with answer "http://example.org/../../../absfile"
*/
failures += check_resolve("http://example.org/dir/file", "../../../absfile", "http://example.org/absfile");
/* RDF xml:base check that an absolute URI replaces */
failures += check_resolve("http://example.org/dir/file", "http://another.example.org/dir2/file2", "http://another.example.org/dir2/file2");
/* base URI and relative URI with no absolute path works */
failures += check_resolve("foo:", "not_scheme:blah", "foo:not_scheme:blah");
/* Issue#000177 http://bugs.librdf.org/mantis/view.php?id=177 */
failures += check_resolve("foo:1234", "9999", "foo:9999");
return failures;
}
#endif
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