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gerrit-public.fairphone.software / fp2-dev / platform / external / libxml2 / 4cf998a6394941373baaf19573dd2c44ae35e12f / . / uri.c
blob: c68a01c0c4720a8d85626891db113873371d3db3 [file] [log] [blame]
/**
* uri.c: set of generic URI related routines
*
* Reference: RFC 2396
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#include "libxml.h"
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/uri.h>
#include <libxml/globals.h>
#include <libxml/xmlerror.h>
/************************************************************************
* *
* Macros to differentiate various character type *
* directly extracted from RFC 2396 *
* *
************************************************************************/
/*
* alpha = lowalpha | upalpha
*/
#define IS_ALPHA(x) (IS_LOWALPHA(x) || IS_UPALPHA(x))
/*
* lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" |
* "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" |
* "u" | "v" | "w" | "x" | "y" | "z"
*/
#define IS_LOWALPHA(x) (((x) >= 'a') && ((x) <= 'z'))
/*
* upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" |
* "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" |
* "U" | "V" | "W" | "X" | "Y" | "Z"
*/
#define IS_UPALPHA(x) (((x) >= 'A') && ((x) <= 'Z'))
/*
* digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
*/
#define IS_DIGIT(x) (((x) >= '0') && ((x) <= '9'))
/*
* alphanum = alpha | digit
*/
#define IS_ALPHANUM(x) (IS_ALPHA(x) || IS_DIGIT(x))
/*
* hex = digit | "A" | "B" | "C" | "D" | "E" | "F" |
* "a" | "b" | "c" | "d" | "e" | "f"
*/
#define IS_HEX(x) ((IS_DIGIT(x)) || (((x) >= 'a') && ((x) <= 'f')) || \
(((x) >= 'A') && ((x) <= 'F')))
/*
* mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
*/
#define IS_MARK(x) (((x) == '-') || ((x) == '_') || ((x) == '.') || \
((x) == '!') || ((x) == '~') || ((x) == '*') || ((x) == '\'') || \
((x) == '(') || ((x) == ')'))
/*
* reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ","
*/
#define IS_RESERVED(x) (((x) == ';') || ((x) == '/') || ((x) == '?') || \
((x) == ':') || ((x) == '@') || ((x) == '&') || ((x) == '=') || \
((x) == '+') || ((x) == '$') || ((x) == ','))
/*
* unreserved = alphanum | mark
*/
#define IS_UNRESERVED(x) (IS_ALPHANUM(x) || IS_MARK(x))
/*
* escaped = "%" hex hex
*/
#define IS_ESCAPED(p) ((*(p) == '%') && (IS_HEX((p)[1])) && \
(IS_HEX((p)[2])))
/*
* uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" |
* "&" | "=" | "+" | "$" | ","
*/
#define IS_URIC_NO_SLASH(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) ||\
((*(p) == ';')) || ((*(p) == '?')) || ((*(p) == ':')) ||\
((*(p) == '@')) || ((*(p) == '&')) || ((*(p) == '=')) ||\
((*(p) == '+')) || ((*(p) == '$')) || ((*(p) == ',')))
/*
* pchar = unreserved | escaped | ":" | "@" | "&" | "=" | "+" | "$" | ","
*/
#define IS_PCHAR(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) || \
((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) ||\
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) ||\
((*(p) == ',')))
/*
* rel_segment = 1*( unreserved | escaped |
* ";" | "@" | "&" | "=" | "+" | "$" | "," )
*/
#define IS_SEGMENT(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) || \
((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) || \
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) || \
((*(p) == ',')))
/*
* scheme = alpha *( alpha | digit | "+" | "-" | "." )
*/
#define IS_SCHEME(x) ((IS_ALPHA(x)) || (IS_DIGIT(x)) || \
((x) == '+') || ((x) == '-') || ((x) == '.'))
/*
* reg_name = 1*( unreserved | escaped | "$" | "," |
* ";" | ":" | "@" | "&" | "=" | "+" )
*/
#define IS_REG_NAME(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) || \
((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) || \
((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) || \
((*(p) == '=')) || ((*(p) == '+')))
/*
* userinfo = *( unreserved | escaped | ";" | ":" | "&" | "=" |
* "+" | "$" | "," )
*/
#define IS_USERINFO(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) || \
((*(p) == ';')) || ((*(p) == ':')) || ((*(p) == '&')) || \
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) || \
((*(p) == ',')))
/*
* uric = reserved | unreserved | escaped
*/
#define IS_URIC(p) ((IS_UNRESERVED(*(p))) || (IS_ESCAPED(p)) || \
(IS_RESERVED(*(p))))
/*
* unwise = "{" | "}" | "|" | "\" | "^" | "[" | "]" | "`"
*/
#define IS_UNWISE(p) \
(((*(p) == '{')) || ((*(p) == '}')) || ((*(p) == '|')) || \
((*(p) == '\\')) || ((*(p) == '^')) || ((*(p) == '[')) || \
((*(p) == ']')) || ((*(p) == '`')))
/*
* Skip to next pointer char, handle escaped sequences
*/
#define NEXT(p) ((*p == '%')? p += 3 : p++)
/*
* Productions from the spec.
*
* authority = server | reg_name
* reg_name = 1*( unreserved | escaped | "$" | "," |
* ";" | ":" | "@" | "&" | "=" | "+" )
*
* path = [ abs_path | opaque_part ]
*/
/************************************************************************
* *
* Generic URI structure functions *
* *
************************************************************************/
/**
* xmlCreateURI:
*
* Simply creates an empty xmlURI
*
* Returns the new structure or NULL in case of error
*/
xmlURIPtr
xmlCreateURI(void) {
xmlURIPtr ret;
ret = (xmlURIPtr) xmlMalloc(sizeof(xmlURI));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlCreateURI: out of memory\n");
return(NULL);
}
memset(ret, 0, sizeof(xmlURI));
return(ret);
}
/**
* xmlSaveUri:
* @uri: pointer to an xmlURI
*
* Save the URI as an escaped string
*
* Returns a new string (to be deallocated by caller)
*/
xmlChar *
xmlSaveUri(xmlURIPtr uri) {
xmlChar *ret = NULL;
const char *p;
int len;
int max;
if (uri == NULL) return(NULL);
max = 80;
ret = (xmlChar *) xmlMalloc((max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
len = 0;
if (uri->scheme != NULL) {
p = uri->scheme;
while (*p != 0) {
if (len >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = *p++;
}
if (len >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = ':';
}
if (uri->opaque != NULL) {
p = uri->opaque;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == ';')) || ((*(p) == '?')) || ((*(p) == ':')) ||
((*(p) == '@')) || ((*(p) == '&')) || ((*(p) == '=')) ||
((*(p) == '+')) || ((*(p) == '$')) || ((*(p) == ',')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
if (len >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = 0;
} else {
if (uri->server != NULL) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '/';
ret[len++] = '/';
if (uri->user != NULL) {
p = uri->user;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == ';')) || ((*(p) == ':')) ||
((*(p) == '&')) || ((*(p) == '=')) ||
((*(p) == '+')) || ((*(p) == '$')) ||
((*(p) == ',')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '@';
}
p = uri->server;
while (*p != 0) {
if (len >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = *p++;
}
if (uri->port > 0) {
if (len + 10 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
len += sprintf((char *) &ret[len], ":%d", uri->port);
}
} else if (uri->authority != NULL) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '/';
ret[len++] = '/';
p = uri->authority;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) ||
((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
} else if (uri->scheme != NULL) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '/';
ret[len++] = '/';
}
if (uri->path != NULL) {
p = uri->path;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) ||
((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) ||
((*(p) == ',')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
}
if (uri->query != NULL) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '?';
p = uri->query;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p))))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
}
if (uri->fragment != NULL) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = '#';
p = uri->fragment;
while (*p != 0) {
if (len + 3 >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret,
(max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p))))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
}
if (len >= max) {
max *= 2;
ret = (xmlChar *) xmlRealloc(ret, (max + 1) * sizeof(xmlChar));
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlSaveUri: out of memory\n");
return(NULL);
}
}
ret[len++] = 0;
}
return(ret);
}
/**
* xmlPrintURI:
* @stream: a FILE* for the output
* @uri: pointer to an xmlURI
*
* Prints the URI in the stream @steam.
*/
void
xmlPrintURI(FILE *stream, xmlURIPtr uri) {
xmlChar *out;
out = xmlSaveUri(uri);
if (out != NULL) {
fprintf(stream, "%s", out);
xmlFree(out);
}
}
/**
* xmlCleanURI:
* @uri: pointer to an xmlURI
*
* Make sure the xmlURI struct is free of content
*/
static void
xmlCleanURI(xmlURIPtr uri) {
if (uri == NULL) return;
if (uri->scheme != NULL) xmlFree(uri->scheme);
uri->scheme = NULL;
if (uri->server != NULL) xmlFree(uri->server);
uri->server = NULL;
if (uri->user != NULL) xmlFree(uri->user);
uri->user = NULL;
if (uri->path != NULL) xmlFree(uri->path);
uri->path = NULL;
if (uri->fragment != NULL) xmlFree(uri->fragment);
uri->fragment = NULL;
if (uri->opaque != NULL) xmlFree(uri->opaque);
uri->opaque = NULL;
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = NULL;
if (uri->query != NULL) xmlFree(uri->query);
uri->query = NULL;
}
/**
* xmlFreeURI:
* @uri: pointer to an xmlURI
*
* Free up the xmlURI struct
*/
void
xmlFreeURI(xmlURIPtr uri) {
if (uri == NULL) return;
if (uri->scheme != NULL) xmlFree(uri->scheme);
if (uri->server != NULL) xmlFree(uri->server);
if (uri->user != NULL) xmlFree(uri->user);
if (uri->path != NULL) xmlFree(uri->path);
if (uri->fragment != NULL) xmlFree(uri->fragment);
if (uri->opaque != NULL) xmlFree(uri->opaque);
if (uri->authority != NULL) xmlFree(uri->authority);
if (uri->query != NULL) xmlFree(uri->query);
xmlFree(uri);
}
/************************************************************************
* *
* Helper functions *
* *
************************************************************************/
/**
* xmlNormalizeURIPath:
* @path: pointer to the path string
*
* Applies the 5 normalization steps to a path string--that is, RFC 2396
* Section 5.2, steps 6.c through 6.g.
*
* Normalization occurs directly on the string, no new allocation is done
*
* Returns 0 or an error code
*/
int
xmlNormalizeURIPath(char *path) {
char *cur, *out;
if (path == NULL)
return(-1);
/* Skip all initial "/" chars. We want to get to the beginning of the
* first non-empty segment.
*/
cur = path;
while (cur[0] == '/')
++cur;
if (cur[0] == '\0')
return(0);
/* Keep everything we've seen so far. */
out = cur;
/*
* Analyze each segment in sequence for cases (c) and (d).
*/
while (cur[0] != '\0') {
/*
* c) All occurrences of "./", where "." is a complete path segment,
* are removed from the buffer string.
*/
if ((cur[0] == '.') && (cur[1] == '/')) {
cur += 2;
/* '//' normalization should be done at this point too */
while (cur[0] == '/')
cur++;
continue;
}
/*
* d) If the buffer string ends with "." as a complete path segment,
* that "." is removed.
*/
if ((cur[0] == '.') && (cur[1] == '\0'))
break;
/* Otherwise keep the segment. */
while (cur[0] != '/') {
if (cur[0] == '\0')
goto done_cd;
(out++)[0] = (cur++)[0];
}
/* nomalize // */
while ((cur[0] == '/') && (cur[1] == '/'))
cur++;
(out++)[0] = (cur++)[0];
}
done_cd:
out[0] = '\0';
/* Reset to the beginning of the first segment for the next sequence. */
cur = path;
while (cur[0] == '/')
++cur;
if (cur[0] == '\0')
return(0);
/*
* Analyze each segment in sequence for cases (e) and (f).
*
* e) All occurrences of "<segment>/../", where <segment> is a
* complete path segment not equal to "..", are removed from the
* buffer string. Removal of these path segments is performed
* iteratively, removing the leftmost matching pattern on each
* iteration, until no matching pattern remains.
*
* f) If the buffer string ends with "<segment>/..", where <segment>
* is a complete path segment not equal to "..", that
* "<segment>/.." is removed.
*
* To satisfy the "iterative" clause in (e), we need to collapse the
* string every time we find something that needs to be removed. Thus,
* we don't need to keep two pointers into the string: we only need a
* "current position" pointer.
*/
while (1) {
char *segp;
/* At the beginning of each iteration of this loop, "cur" points to
* the first character of the segment we want to examine.
*/
/* Find the end of the current segment. */
segp = cur;
while ((segp[0] != '/') && (segp[0] != '\0'))
++segp;
/* If this is the last segment, we're done (we need at least two
* segments to meet the criteria for the (e) and (f) cases).
*/
if (segp[0] == '\0')
break;
/* If the first segment is "..", or if the next segment _isn't_ "..",
* keep this segment and try the next one.
*/
++segp;
if (((cur[0] == '.') && (cur[1] == '.') && (segp == cur+3))
|| ((segp[0] != '.') || (segp[1] != '.')
|| ((segp[2] != '/') && (segp[2] != '\0')))) {
cur = segp;
continue;
}
/* If we get here, remove this segment and the next one and back up
* to the previous segment (if there is one), to implement the
* "iteratively" clause. It's pretty much impossible to back up
* while maintaining two pointers into the buffer, so just compact
* the whole buffer now.
*/
/* If this is the end of the buffer, we're done. */
if (segp[2] == '\0') {
cur[0] = '\0';
break;
}
strcpy(cur, segp + 3);
/* If there are no previous segments, then keep going from here. */
segp = cur;
while ((segp > path) && ((--segp)[0] == '/'))
;
if (segp == path)
continue;
/* "segp" is pointing to the end of a previous segment; find it's
* start. We need to back up to the previous segment and start
* over with that to handle things like "foo/bar/../..". If we
* don't do this, then on the first pass we'll remove the "bar/..",
* but be pointing at the second ".." so we won't realize we can also
* remove the "foo/..".
*/
cur = segp;
while ((cur > path) && (cur[-1] != '/'))
--cur;
}
out[0] = '\0';
/*
* g) If the resulting buffer string still begins with one or more
* complete path segments of "..", then the reference is
* considered to be in error. Implementations may handle this
* error by retaining these components in the resolved path (i.e.,
* treating them as part of the final URI), by removing them from
* the resolved path (i.e., discarding relative levels above the
* root), or by avoiding traversal of the reference.
*
* We discard them from the final path.
*/
if (path[0] == '/') {
cur = path;
while ((cur[1] == '.') && (cur[2] == '.')
&& ((cur[3] == '/') || (cur[3] == '\0')))
cur += 3;
if (cur != path) {
out = path;
while (cur[0] != '\0')
(out++)[0] = (cur++)[0];
out[0] = 0;
}
}
return(0);
}
/**
* xmlURIUnescapeString:
* @str: the string to unescape
* @len: the length in bytes to unescape (or <= 0 to indicate full string)
* @target: optional destination buffer
*
* Unescaping routine, does not do validity checks !
* Output is direct unsigned char translation of %XX values (no encoding)
*
* Returns an copy of the string, but unescaped
*/
char *
xmlURIUnescapeString(const char *str, int len, char *target) {
char *ret, *out;
const char *in;
if (str == NULL)
return(NULL);
if (len <= 0) len = strlen(str);
if (len <= 0) return(NULL);
if (target == NULL) {
ret = (char *) xmlMalloc(len + 1);
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlURIUnescapeString: out of memory\n");
return(NULL);
}
} else
ret = target;
in = str;
out = ret;
while(len > 0) {
if (*in == '%') {
in++;
if ((*in >= '0') && (*in <= '9'))
*out = (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
*out = (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
*out = (*in - 'A') + 10;
in++;
if ((*in >= '0') && (*in <= '9'))
*out = *out * 16 + (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
*out = *out * 16 + (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
*out = *out * 16 + (*in - 'A') + 10;
in++;
len -= 3;
out++;
} else {
*out++ = *in++;
len--;
}
}
*out = 0;
return(ret);
}
/**
* xmlURIEscapeStr:
* @str: string to escape
* @list: exception list string of chars not to escape
*
* This routine escapes a string to hex, ignoring reserved characters (a-z)
* and the characters in the exception list.
*
* Returns a new escaped string or NULL in case of error.
*/
xmlChar *
xmlURIEscapeStr(const xmlChar *str, const xmlChar *list) {
xmlChar *ret, ch;
const xmlChar *in;
unsigned int len, out;
if (str == NULL)
return(NULL);
len = xmlStrlen(str);
if (len <= 0) return(NULL);
len += 20;
ret = (xmlChar *) xmlMalloc(len);
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlURIEscapeStr: out of memory\n");
return(NULL);
}
in = (const xmlChar *) str;
out = 0;
while(*in != 0) {
if (len - out <= 3) {
len += 20;
ret = (xmlChar *) xmlRealloc(ret, len);
if (ret == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlURIEscapeStr: out of memory\n");
return(NULL);
}
}
ch = *in;
if ( (!IS_UNRESERVED(ch)) && (!xmlStrchr(list, ch)) ) {
unsigned char val;
ret[out++] = '%';
val = ch >> 4;
if (val <= 9)
ret[out++] = '0' + val;
else
ret[out++] = 'A' + val - 0xA;
val = ch & 0xF;
if (val <= 9)
ret[out++] = '0' + val;
else
ret[out++] = 'A' + val - 0xA;
in++;
} else {
ret[out++] = *in++;
}
}
ret[out] = 0;
return(ret);
}
/**
* xmlURIEscape:
* @str: the string of the URI to escape
*
* Escaping routine, does not do validity checks !
* It will try to escape the chars needing this, but this is heuristic
* based it's impossible to be sure.
*
* Returns an copy of the string, but escaped
*
* 25 May 2001
* Uses xmlParseURI and xmlURIEscapeStr to try to escape correctly
* according to RFC2396.
* - Carl Douglas
*/
xmlChar *
xmlURIEscape(const xmlChar * str)
{
xmlChar *ret, *segment = NULL;
xmlURIPtr uri;
int ret2;
#define NULLCHK(p) if(!p) { \
xmlGenericError(xmlGenericErrorContext, \
"xmlURIEscape: out of memory\n"); \
return NULL; }
if (str == NULL)
return (NULL);
uri = xmlCreateURI();
if (uri != NULL) {
/*
* Allow escaping errors in the unescaped form
*/
uri->cleanup = 1;
ret2 = xmlParseURIReference(uri, (const char *)str);
if (ret2) {
xmlFreeURI(uri);
return (NULL);
}
}
if (!uri)
return NULL;
ret = NULL;
if (uri->scheme) {
segment = xmlURIEscapeStr(BAD_CAST uri->scheme, BAD_CAST "+-.");
NULLCHK(segment)
ret = xmlStrcat(ret, segment);
ret = xmlStrcat(ret, BAD_CAST ":");
xmlFree(segment);
}
if (uri->authority) {
segment =
xmlURIEscapeStr(BAD_CAST uri->authority, BAD_CAST "/?;:@");
NULLCHK(segment)
ret = xmlStrcat(ret, BAD_CAST "//");
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->user) {
segment = xmlURIEscapeStr(BAD_CAST uri->user, BAD_CAST ";:&=+$,");
NULLCHK(segment)
ret = xmlStrcat(ret, segment);
ret = xmlStrcat(ret, BAD_CAST "@");
xmlFree(segment);
}
if (uri->server) {
segment = xmlURIEscapeStr(BAD_CAST uri->server, BAD_CAST "/?;:@");
NULLCHK(segment)
ret = xmlStrcat(ret, BAD_CAST "//");
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->port) {
xmlChar port[10];
snprintf((char *) port, 10, "%d", uri->port);
ret = xmlStrcat(ret, BAD_CAST ":");
ret = xmlStrcat(ret, port);
}
if (uri->path) {
segment =
xmlURIEscapeStr(BAD_CAST uri->path, BAD_CAST ":@&=+$,/?;");
NULLCHK(segment)
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->query) {
segment =
xmlURIEscapeStr(BAD_CAST uri->query, BAD_CAST ";/?:@&=+,$");
NULLCHK(segment)
ret = xmlStrcat(ret, BAD_CAST "?");
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->opaque) {
segment = xmlURIEscapeStr(BAD_CAST uri->opaque, BAD_CAST "");
NULLCHK(segment)
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->fragment) {
segment = xmlURIEscapeStr(BAD_CAST uri->fragment, BAD_CAST "#");
NULLCHK(segment)
ret = xmlStrcat(ret, BAD_CAST "#");
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
xmlFreeURI(uri);
#undef NULLCHK
return (ret);
}
/************************************************************************
* *
* Escaped URI parsing *
* *
************************************************************************/
/**
* xmlParseURIFragment:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI fragment string and fills in the appropriate fields
* of the @uri structure.
*
* fragment = *uric
*
* Returns 0 or the error code
*/
static int
xmlParseURIFragment(xmlURIPtr uri, const char **str)
{
const char *cur = *str;
if (str == NULL)
return (-1);
while (IS_URIC(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
if (uri->fragment != NULL)
xmlFree(uri->fragment);
uri->fragment = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return (0);
}
/**
* xmlParseURIQuery:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse the query part of an URI
*
* query = *uric
*
* Returns 0 or the error code
*/
static int
xmlParseURIQuery(xmlURIPtr uri, const char **str)
{
const char *cur = *str;
if (str == NULL)
return (-1);
while (IS_URIC(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
if (uri->query != NULL)
xmlFree(uri->query);
uri->query = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return (0);
}
/**
* xmlParseURIScheme:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI scheme
*
* scheme = alpha *( alpha | digit | "+" | "-" | "." )
*
* Returns 0 or the error code
*/
static int
xmlParseURIScheme(xmlURIPtr uri, const char **str) {
const char *cur;
if (str == NULL)
return(-1);
cur = *str;
if (!IS_ALPHA(*cur))
return(2);
cur++;
while (IS_SCHEME(*cur)) cur++;
if (uri != NULL) {
if (uri->scheme != NULL) xmlFree(uri->scheme);
/* !!! strndup */
uri->scheme = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return(0);
}
/**
* xmlParseURIOpaquePart:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI opaque part
*
* opaque_part = uric_no_slash *uric
*
* Returns 0 or the error code
*/
static int
xmlParseURIOpaquePart(xmlURIPtr uri, const char **str)
{
const char *cur;
if (str == NULL)
return (-1);
cur = *str;
if (!(IS_URIC_NO_SLASH(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))) {
return (3);
}
NEXT(cur);
while (IS_URIC(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
if (uri->opaque != NULL)
xmlFree(uri->opaque);
uri->opaque = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return (0);
}
/**
* xmlParseURIServer:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse a server subpart of an URI, it's a finer grain analysis
* of the authority part.
*
* server = [ [ userinfo "@" ] hostport ]
* userinfo = *( unreserved | escaped |
* ";" | ":" | "&" | "=" | "+" | "$" | "," )
* hostport = host [ ":" port ]
* host = hostname | IPv4address
* hostname = *( domainlabel "." ) toplabel [ "." ]
* domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
* toplabel = alpha | alpha *( alphanum | "-" ) alphanum
* IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
* port = *digit
*
* Returns 0 or the error code
*/
static int
xmlParseURIServer(xmlURIPtr uri, const char **str) {
const char *cur;
const char *host, *tmp;
if (str == NULL)
return(-1);
cur = *str;
/*
* is there an userinfo ?
*/
while (IS_USERINFO(cur)) NEXT(cur);
if (*cur == '@') {
if (uri != NULL) {
if (uri->user != NULL) xmlFree(uri->user);
uri->user = xmlURIUnescapeString(*str, cur - *str, NULL);
}
cur++;
} else {
if (uri != NULL) {
if (uri->user != NULL) xmlFree(uri->user);
uri->user = NULL;
}
cur = *str;
}
/*
* This can be empty in the case where there is no server
*/
host = cur;
if (*cur == '/') {
if (uri != NULL) {
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = NULL;
if (uri->server != NULL) xmlFree(uri->server);
uri->server = NULL;
uri->port = 0;
}
return(0);
}
/*
* host part of hostport can derive either an IPV4 address
* or an unresolved name. Check the IP first, it easier to detect
* errors if wrong one
*/
if (IS_DIGIT(*cur)) {
while(IS_DIGIT(*cur)) cur++;
if (*cur != '.')
goto host_name;
cur++;
if (!IS_DIGIT(*cur))
goto host_name;
while(IS_DIGIT(*cur)) cur++;
if (*cur != '.')
goto host_name;
cur++;
if (!IS_DIGIT(*cur))
goto host_name;
while(IS_DIGIT(*cur)) cur++;
if (*cur != '.')
goto host_name;
cur++;
if (!IS_DIGIT(*cur))
goto host_name;
while(IS_DIGIT(*cur)) cur++;
if (uri != NULL) {
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = NULL;
if (uri->server != NULL) xmlFree(uri->server);
uri->server = xmlURIUnescapeString(host, cur - host, NULL);
}
goto host_done;
}
host_name:
/*
* the hostname production as-is is a parser nightmare.
* simplify it to
* hostname = *( domainlabel "." ) domainlabel [ "." ]
* and just make sure the last label starts with a non numeric char.
*/
if (!IS_ALPHANUM(*cur))
return(6);
while (IS_ALPHANUM(*cur)) {
while ((IS_ALPHANUM(*cur)) || (*cur == '-')) cur++;
if (*cur == '.')
cur++;
}
tmp = cur;
tmp--;
while (IS_ALPHANUM(*tmp) && (*tmp != '.') && (tmp >= host)) tmp--;
tmp++;
if (!IS_ALPHA(*tmp))
return(7);
if (uri != NULL) {
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = NULL;
if (uri->server != NULL) xmlFree(uri->server);
uri->server = xmlURIUnescapeString(host, cur - host, NULL);
}
host_done:
/*
* finish by checking for a port presence.
*/
if (*cur == ':') {
cur++;
if (IS_DIGIT(*cur)) {
if (uri != NULL)
uri->port = 0;
while (IS_DIGIT(*cur)) {
if (uri != NULL)
uri->port = uri->port * 10 + (*cur - '0');
cur++;
}
}
}
*str = cur;
return(0);
}
/**
* xmlParseURIRelSegment:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI relative segment
*
* rel_segment = 1*( unreserved | escaped | ";" | "@" | "&" | "=" |
* "+" | "$" | "," )
*
* Returns 0 or the error code
*/
static int
xmlParseURIRelSegment(xmlURIPtr uri, const char **str)
{
const char *cur;
if (str == NULL)
return (-1);
cur = *str;
if (!(IS_SEGMENT(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))) {
return (3);
}
NEXT(cur);
while (IS_SEGMENT(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
if (uri->path != NULL)
xmlFree(uri->path);
uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return (0);
}
/**
* xmlParseURIPathSegments:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
* @slash: should we add a leading slash
*
* Parse an URI set of path segments
*
* path_segments = segment *( "/" segment )
* segment = *pchar *( ";" param )
* param = *pchar
*
* Returns 0 or the error code
*/
static int
xmlParseURIPathSegments(xmlURIPtr uri, const char **str, int slash)
{
const char *cur;
if (str == NULL)
return (-1);
cur = *str;
do {
while (IS_PCHAR(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
if (*cur == ';') {
cur++;
while (IS_PCHAR(cur) || ((uri->cleanup) && (IS_UNWISE(cur))))
NEXT(cur);
}
if (*cur != '/')
break;
cur++;
} while (1);
if (uri != NULL) {
int len, len2 = 0;
char *path;
/*
* Concat the set of path segments to the current path
*/
len = cur - *str;
if (slash)
len++;
if (uri->path != NULL) {
len2 = strlen(uri->path);
len += len2;
}
path = (char *) xmlMalloc(len + 1);
if (path == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlParseURIPathSegments: out of memory\n");
*str = cur;
return (-1);
}
if (uri->path != NULL)
memcpy(path, uri->path, len2);
if (slash) {
path[len2] = '/';
len2++;
}
path[len2] = 0;
if (cur - *str > 0)
xmlURIUnescapeString(*str, cur - *str, &path[len2]);
if (uri->path != NULL)
xmlFree(uri->path);
uri->path = path;
}
*str = cur;
return (0);
}
/**
* xmlParseURIAuthority:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse the authority part of an URI.
*
* authority = server | reg_name
* server = [ [ userinfo "@" ] hostport ]
* reg_name = 1*( unreserved | escaped | "$" | "," | ";" | ":" |
* "@" | "&" | "=" | "+" )
*
* Note : this is completely ambiguous since reg_name is allowed to
* use the full set of chars in use by server:
*
* 3.2.1. Registry-based Naming Authority
*
* The structure of a registry-based naming authority is specific
* to the URI scheme, but constrained to the allowed characters
* for an authority component.
*
* Returns 0 or the error code
*/
static int
xmlParseURIAuthority(xmlURIPtr uri, const char **str) {
const char *cur;
int ret;
if (str == NULL)
return(-1);
cur = *str;
/*
* try first to parse it as a server string.
*/
ret = xmlParseURIServer(uri, str);
if (ret == 0)
return(0);
/*
* failed, fallback to reg_name
*/
if (!IS_REG_NAME(cur)) {
return(5);
}
NEXT(cur);
while (IS_REG_NAME(cur)) NEXT(cur);
if (uri != NULL) {
if (uri->server != NULL) xmlFree(uri->server);
uri->server = NULL;
if (uri->user != NULL) xmlFree(uri->user);
uri->user = NULL;
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = xmlURIUnescapeString(*str, cur - *str, NULL);
}
*str = cur;
return(0);
}
/**
* xmlParseURIHierPart:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI hierarchical part
*
* hier_part = ( net_path | abs_path ) [ "?" query ]
* abs_path = "/" path_segments
* net_path = "//" authority [ abs_path ]
*
* Returns 0 or the error code
*/
static int
xmlParseURIHierPart(xmlURIPtr uri, const char **str) {
int ret;
const char *cur;
if (str == NULL)
return(-1);
cur = *str;
if ((cur[0] == '/') && (cur[1] == '/')) {
cur += 2;
ret = xmlParseURIAuthority(uri, &cur);
if (ret != 0)
return(ret);
if (cur[0] == '/') {
cur++;
ret = xmlParseURIPathSegments(uri, &cur, 1);
}
} else if (cur[0] == '/') {
cur++;
ret = xmlParseURIPathSegments(uri, &cur, 1);
} else {
return(4);
}
if (ret != 0)
return(ret);
if (*cur == '?') {
cur++;
ret = xmlParseURIQuery(uri, &cur);
if (ret != 0)
return(ret);
}
*str = cur;
return(0);
}
/**
* xmlParseAbsoluteURI:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI reference string and fills in the appropriate fields
* of the @uri structure
*
* absoluteURI = scheme ":" ( hier_part | opaque_part )
*
* Returns 0 or the error code
*/
static int
xmlParseAbsoluteURI(xmlURIPtr uri, const char **str) {
int ret;
const char *cur;
if (str == NULL)
return(-1);
cur = *str;
ret = xmlParseURIScheme(uri, str);
if (ret != 0) return(ret);
if (**str != ':') {
*str = cur;
return(1);
}
(*str)++;
if (**str == '/')
return(xmlParseURIHierPart(uri, str));
return(xmlParseURIOpaquePart(uri, str));
}
/**
* xmlParseRelativeURI:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an relative URI string and fills in the appropriate fields
* of the @uri structure
*
* relativeURI = ( net_path | abs_path | rel_path ) [ "?" query ]
* abs_path = "/" path_segments
* net_path = "//" authority [ abs_path ]
* rel_path = rel_segment [ abs_path ]
*
* Returns 0 or the error code
*/
static int
xmlParseRelativeURI(xmlURIPtr uri, const char **str) {
int ret = 0;
const char *cur;
if (str == NULL)
return(-1);
cur = *str;
if ((cur[0] == '/') && (cur[1] == '/')) {
cur += 2;
ret = xmlParseURIAuthority(uri, &cur);
if (ret != 0)
return(ret);
if (cur[0] == '/') {
cur++;
ret = xmlParseURIPathSegments(uri, &cur, 1);
}
} else if (cur[0] == '/') {
cur++;
ret = xmlParseURIPathSegments(uri, &cur, 1);
} else if (cur[0] != '#' && cur[0] != '?') {
ret = xmlParseURIRelSegment(uri, &cur);
if (ret != 0)
return(ret);
if (cur[0] == '/') {
cur++;
ret = xmlParseURIPathSegments(uri, &cur, 1);
}
}
if (ret != 0)
return(ret);
if (*cur == '?') {
cur++;
ret = xmlParseURIQuery(uri, &cur);
if (ret != 0)
return(ret);
}
*str = cur;
return(ret);
}
/**
* xmlParseURIReference:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI reference string and fills in the appropriate fields
* of the @uri structure
*
* URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
*
* Returns 0 or the error code
*/
int
xmlParseURIReference(xmlURIPtr uri, const char *str) {
int ret;
const char *tmp = str;
if (str == NULL)
return(-1);
xmlCleanURI(uri);
/*
* Try first to parse absolute refs, then fallback to relative if
* it fails.
*/
ret = xmlParseAbsoluteURI(uri, &str);
if (ret != 0) {
xmlCleanURI(uri);
str = tmp;
ret = xmlParseRelativeURI(uri, &str);
}
if (ret != 0) {
xmlCleanURI(uri);
return(ret);
}
if (*str == '#') {
str++;
ret = xmlParseURIFragment(uri, &str);
if (ret != 0) return(ret);
}
if (*str != 0) {
xmlCleanURI(uri);
return(1);
}
return(0);
}
/**
* xmlParseURI:
* @str: the URI string to analyze
*
* Parse an URI
*
* URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
*
* Returns a newly build xmlURIPtr or NULL in case of error
*/
xmlURIPtr
xmlParseURI(const char *str) {
xmlURIPtr uri;
int ret;
if (str == NULL)
return(NULL);
uri = xmlCreateURI();
if (uri != NULL) {
ret = xmlParseURIReference(uri, str);
if (ret) {
xmlFreeURI(uri);
return(NULL);
}
}
return(uri);
}
/************************************************************************
* *
* Public functions *
* *
************************************************************************/
/**
* xmlBuildURI:
* @URI: the URI instance found in the document
* @base: the base value
*
* Computes he final URI of the reference done by checking that
* the given URI is valid, and building the final URI using the
* base URI. This is processed according to section 5.2 of the
* RFC 2396
*
* 5.2. Resolving Relative References to Absolute Form
*
* Returns a new URI string (to be freed by the caller) or NULL in case
* of error.
*/
xmlChar *
xmlBuildURI(const xmlChar *URI, const xmlChar *base) {
xmlChar *val = NULL;
int ret, len, indx, cur, out;
xmlURIPtr ref = NULL;
xmlURIPtr bas = NULL;
xmlURIPtr res = NULL;
/*
* 1) The URI reference is parsed into the potential four components and
* fragment identifier, as described in Section 4.3.
*
* NOTE that a completely empty URI is treated by modern browsers
* as a reference to "." rather than as a synonym for the current
* URI. Should we do that here?
*/
if (URI == NULL)
ret = -1;
else {
if (*URI) {
ref = xmlCreateURI();
if (ref == NULL)
goto done;
ret = xmlParseURIReference(ref, (const char *) URI);
}
else
ret = 0;
}
if (ret != 0)
goto done;
if (base == NULL)
ret = -1;
else {
bas = xmlCreateURI();
if (bas == NULL)
goto done;
ret = xmlParseURIReference(bas, (const char *) base);
}
if (ret != 0) {
if (ref)
val = xmlSaveUri(ref);
goto done;
}
if (ref == NULL) {
/*
* the base fragment must be ignored
*/
if (bas->fragment != NULL) {
xmlFree(bas->fragment);
bas->fragment = NULL;
}
val = xmlSaveUri(bas);
goto done;
}
/*
* 2) If the path component is empty and the scheme, authority, and
* query components are undefined, then it is a reference to the
* current document and we are done. Otherwise, the reference URI's
* query and fragment components are defined as found (or not found)
* within the URI reference and not inherited from the base URI.
*
* NOTE that in modern browsers, the parsing differs from the above
* in the following aspect: the query component is allowed to be
* defined while still treating this as a reference to the current
* document.
*/
res = xmlCreateURI();
if (res == NULL)
goto done;
if ((ref->scheme == NULL) && (ref->path == NULL) &&
((ref->authority == NULL) && (ref->server == NULL))) {
if (bas->scheme != NULL)
res->scheme = xmlMemStrdup(bas->scheme);
if (bas->authority != NULL)
res->authority = xmlMemStrdup(bas->authority);
else if (bas->server != NULL) {
res->server = xmlMemStrdup(bas->server);
if (bas->user != NULL)
res->user = xmlMemStrdup(bas->user);
res->port = bas->port;
}
if (bas->path != NULL)
res->path = xmlMemStrdup(bas->path);
if (ref->query != NULL)
res->query = xmlMemStrdup(ref->query);
else if (bas->query != NULL)
res->query = xmlMemStrdup(bas->query);
if (ref->fragment != NULL)
res->fragment = xmlMemStrdup(ref->fragment);
goto step_7;
}
if (ref->query != NULL)
res->query = xmlMemStrdup(ref->query);
if (ref->fragment != NULL)
res->fragment = xmlMemStrdup(ref->fragment);
/*
* 3) If the scheme component is defined, indicating that the reference
* starts with a scheme name, then the reference is interpreted as an
* absolute URI and we are done. Otherwise, the reference URI's
* scheme is inherited from the base URI's scheme component.
*/
if (ref->scheme != NULL) {
val = xmlSaveUri(ref);
goto done;
}
if (bas->scheme != NULL)
res->scheme = xmlMemStrdup(bas->scheme);
/*
* 4) If the authority component is defined, then the reference is a
* network-path and we skip to step 7. Otherwise, the reference
* URI's authority is inherited from the base URI's authority
* component, which will also be undefined if the URI scheme does not
* use an authority component.
*/
if ((ref->authority != NULL) || (ref->server != NULL)) {
if (ref->authority != NULL)
res->authority = xmlMemStrdup(ref->authority);
else {
res->server = xmlMemStrdup(ref->server);
if (ref->user != NULL)
res->user = xmlMemStrdup(ref->user);
res->port = ref->port;
}
if (ref->path != NULL)
res->path = xmlMemStrdup(ref->path);
goto step_7;
}
if (bas->authority != NULL)
res->authority = xmlMemStrdup(bas->authority);
else if (bas->server != NULL) {
res->server = xmlMemStrdup(bas->server);
if (bas->user != NULL)
res->user = xmlMemStrdup(bas->user);
res->port = bas->port;
}
/*
* 5) If the path component begins with a slash character ("/"), then
* the reference is an absolute-path and we skip to step 7.
*/
if ((ref->path != NULL) && (ref->path[0] == '/')) {
res->path = xmlMemStrdup(ref->path);
goto step_7;
}
/*
* 6) If this step is reached, then we are resolving a relative-path
* reference. The relative path needs to be merged with the base
* URI's path. Although there are many ways to do this, we will
* describe a simple method using a separate string buffer.
*
* Allocate a buffer large enough for the result string.
*/
len = 2; /* extra / and 0 */
if (ref->path != NULL)
len += strlen(ref->path);
if (bas->path != NULL)
len += strlen(bas->path);
res->path = (char *) xmlMalloc(len);
if (res->path == NULL) {
xmlGenericError(xmlGenericErrorContext,
"xmlBuildURI: out of memory\n");
goto done;
}
res->path[0] = 0;
/*
* a) All but the last segment of the base URI's path component is
* copied to the buffer. In other words, any characters after the
* last (right-most) slash character, if any, are excluded.
*/
cur = 0;
out = 0;
if (bas->path != NULL) {
while (bas->path[cur] != 0) {
while ((bas->path[cur] != 0) && (bas->path[cur] != '/'))
cur++;
if (bas->path[cur] == 0)
break;
cur++;
while (out < cur) {
res->path[out] = bas->path[out];
out++;
}
}
}
res->path[out] = 0;
/*
* b) The reference's path component is appended to the buffer
* string.
*/
if (ref->path != NULL && ref->path[0] != 0) {
indx = 0;
/*
* Ensure the path includes a '/'
*/
if ((out == 0) && (bas->server != NULL))
res->path[out++] = '/';
while (ref->path[indx] != 0) {
res->path[out++] = ref->path[indx++];
}
}
res->path[out] = 0;
/*
* Steps c) to h) are really path normalization steps
*/
xmlNormalizeURIPath(res->path);
step_7:
/*
* 7) The resulting URI components, including any inherited from the
* base URI, are recombined to give the absolute form of the URI
* reference.
*/
val = xmlSaveUri(res);
done:
if (ref != NULL)
xmlFreeURI(ref);
if (bas != NULL)
xmlFreeURI(bas);
if (res != NULL)
xmlFreeURI(res);
return(val);
}