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libxml2/uri.c
Nick Wellnhofer 4c3d22b059 uri: Fix xmlBuildURI with NULL base 
Don't try to parse URI if base is NULL. Fixes functions like xmlParseDTD
with certain filenames.

Should fix #742.
2024-06-20 21:15:08 +02:00

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/**
* uri.c: set of generic URI related routines
*
* Reference: RFCs 3986, 2732 and 2373
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#include <limits.h>
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include "private/error.h"
/**
* MAX_URI_LENGTH:
*
* The definition of the URI regexp in the above RFC has no size limit
* In practice they are usually relatively short except for the
* data URI scheme as defined in RFC 2397. Even for data URI the usual
* maximum size before hitting random practical limits is around 64 KB
* and 4KB is usually a maximum admitted limit for proper operations.
* The value below is more a security limit than anything else and
* really should never be hit by 'normal' operations
* Set to 1 MByte in 2012, this is only enforced on output
*/
#define MAX_URI_LENGTH 1024 * 1024
#define PORT_EMPTY 0
#define PORT_EMPTY_SERVER -1
static void xmlCleanURI(xmlURIPtr uri);
/*
* Old rule from 2396 used in legacy handling code
* 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'))
#ifdef IS_DIGIT
#undef IS_DIGIT
#endif
/*
* 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))
/*
* mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
*/
#define IS_MARK(x) (((x) == '-') || ((x) == '_') || ((x) == '.') || \
((x) == '!') || ((x) == '~') || ((x) == '*') || ((x) == '\'') || \
((x) == '(') || ((x) == ')'))
/*
* unwise = "{" | "}" | "|" | "\" | "^" | "`"
*/
#define IS_UNWISE(p) \
(((*(p) == '{')) || ((*(p) == '}')) || ((*(p) == '|')) || \
((*(p) == '\\')) || ((*(p) == '^')) || ((*(p) == '[')) || \
((*(p) == ']')) || ((*(p) == '`')))
/*
* reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," |
* "[" | "]"
*/
#define IS_RESERVED(x) (((x) == ';') || ((x) == '/') || ((x) == '?') || \
((x) == ':') || ((x) == '@') || ((x) == '&') || ((x) == '=') || \
((x) == '+') || ((x) == '$') || ((x) == ',') || ((x) == '[') || \
((x) == ']'))
/*
* unreserved = alphanum | mark
*/
#define IS_UNRESERVED(x) (IS_ALPHANUM(x) || IS_MARK(x))
/*
* 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 | "$" | "," |
* ";" | ":" | "@" | "&" | "=" | "+" )
*
* path = [ abs_path | opaque_part ]
*/
#define STRNDUP(s, n) (char *) xmlStrndup((const xmlChar *)(s), (n))
/************************************************************************
* *
* RFC 3986 parser *
* *
************************************************************************/
#define ISA_DIGIT(p) ((*(p) >= '0') && (*(p) <= '9'))
#define ISA_ALPHA(p) (((*(p) >= 'a') && (*(p) <= 'z')) || \
((*(p) >= 'A') && (*(p) <= 'Z')))
#define ISA_HEXDIG(p) \
(ISA_DIGIT(p) || ((*(p) >= 'a') && (*(p) <= 'f')) || \
((*(p) >= 'A') && (*(p) <= 'F')))
/*
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
* / "*" / "+" / "," / ";" / "="
*/
#define ISA_SUB_DELIM(p) \
(((*(p) == '!')) || ((*(p) == '$')) || ((*(p) == '&')) || \
((*(p) == '(')) || ((*(p) == ')')) || ((*(p) == '*')) || \
((*(p) == '+')) || ((*(p) == ',')) || ((*(p) == ';')) || \
((*(p) == '=')) || ((*(p) == '\'')))
/*
* gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
*/
#define ISA_GEN_DELIM(p) \
(((*(p) == ':')) || ((*(p) == '/')) || ((*(p) == '?')) || \
((*(p) == '#')) || ((*(p) == '[')) || ((*(p) == ']')) || \
((*(p) == '@')))
/*
* reserved = gen-delims / sub-delims
*/
#define ISA_RESERVED(p) (ISA_GEN_DELIM(p) || (ISA_SUB_DELIM(p)))
/*
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
*/
#define ISA_STRICTLY_UNRESERVED(p) \
((ISA_ALPHA(p)) || (ISA_DIGIT(p)) || ((*(p) == '-')) || \
((*(p) == '.')) || ((*(p) == '_')) || ((*(p) == '~')))
/*
* pct-encoded = "%" HEXDIG HEXDIG
*/
#define ISA_PCT_ENCODED(p) \
((*(p) == '%') && (ISA_HEXDIG(p + 1)) && (ISA_HEXDIG(p + 2)))
/*
* pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
*/
#define ISA_PCHAR(u, p) \
(ISA_UNRESERVED(u, p) || ISA_PCT_ENCODED(p) || ISA_SUB_DELIM(p) || \
((*(p) == ':')) || ((*(p) == '@')))
/*
* From https://www.w3.org/TR/leiri/
*
* " " / "<" / ">" / '"' / "{" / "}" / "|"
* / "\" / "^" / "`" / %x0-1F / %x7F-D7FF
* / %xE000-FFFD / %x10000-10FFFF
*/
#define ISA_UCSCHAR(p) \
((*(p) <= 0x20) || (*(p) >= 0x7F) || (*(p) == '<') || (*(p) == '>') || \
(*(p) == '"') || (*(p) == '{') || (*(p) == '}') || (*(p) == '|') || \
(*(p) == '\\') || (*(p) == '^') || (*(p) == '`'))
#define ISA_UNRESERVED(u, p) (xmlIsUnreserved(u, p))
#define XML_URI_ALLOW_UNWISE 1
#define XML_URI_NO_UNESCAPE 2
#define XML_URI_ALLOW_UCSCHAR 4
static int
xmlIsUnreserved(xmlURIPtr uri, const char *cur) {
if (uri == NULL)
return(0);
if (ISA_STRICTLY_UNRESERVED(cur))
return(1);
if (uri->cleanup & XML_URI_ALLOW_UNWISE) {
if (IS_UNWISE(cur))
return(1);
} else if (uri->cleanup & XML_URI_ALLOW_UCSCHAR) {
if (ISA_UCSCHAR(cur))
return(1);
}
return(0);
}
/**
* xmlParse3986Scheme:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI scheme
*
* ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
*
* Returns 0 or the error code
*/
static int
xmlParse3986Scheme(xmlURIPtr uri, const char **str) {
const char *cur;
cur = *str;
if (!ISA_ALPHA(cur))
return(1);
cur++;
while (ISA_ALPHA(cur) || ISA_DIGIT(cur) ||
(*cur == '+') || (*cur == '-') || (*cur == '.')) cur++;
if (uri != NULL) {
if (uri->scheme != NULL) xmlFree(uri->scheme);
uri->scheme = STRNDUP(*str, cur - *str);
if (uri->scheme == NULL)
return(-1);
}
*str = cur;
return(0);
}
/**
* xmlParse3986Fragment:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse the query part of an URI
*
* fragment = *( pchar / "/" / "?" )
* NOTE: the strict syntax as defined by 3986 does not allow '[' and ']'
* in the fragment identifier but this is used very broadly for
* xpointer scheme selection, so we are allowing it here to not break
* for example all the DocBook processing chains.
*
* Returns 0 or the error code
*/
static int
xmlParse3986Fragment(xmlURIPtr uri, const char **str)
{
const char *cur;
cur = *str;
while ((ISA_PCHAR(uri, cur)) || (*cur == '/') || (*cur == '?') ||
(*cur == '[') || (*cur == ']'))
NEXT(cur);
if (uri != NULL) {
if (uri->fragment != NULL)
xmlFree(uri->fragment);
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->fragment = STRNDUP(*str, cur - *str);
else
uri->fragment = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->fragment == NULL)
return (-1);
}
*str = cur;
return (0);
}
/**
* xmlParse3986Query:
* @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
xmlParse3986Query(xmlURIPtr uri, const char **str)
{
const char *cur;
cur = *str;
while ((ISA_PCHAR(uri, cur)) || (*cur == '/') || (*cur == '?'))
NEXT(cur);
if (uri != NULL) {
if (uri->query != NULL)
xmlFree(uri->query);
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->query = STRNDUP(*str, cur - *str);
else
uri->query = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->query == NULL)
return (-1);
/* Save the raw bytes of the query as well.
* See: http://mail.gnome.org/archives/xml/2007-April/thread.html#00114
*/
if (uri->query_raw != NULL)
xmlFree (uri->query_raw);
uri->query_raw = STRNDUP (*str, cur - *str);
if (uri->query_raw == NULL)
return (-1);
}
*str = cur;
return (0);
}
/**
* xmlParse3986Port:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse a port part and fills in the appropriate fields
* of the @uri structure
*
* port = *DIGIT
*
* Returns 0 or the error code
*/
static int
xmlParse3986Port(xmlURIPtr uri, const char **str)
{
const char *cur = *str;
int port = 0;
if (ISA_DIGIT(cur)) {
while (ISA_DIGIT(cur)) {
int digit = *cur - '0';
if (port > INT_MAX / 10)
return(1);
port *= 10;
if (port > INT_MAX - digit)
return(1);
port += digit;
cur++;
}
if (uri != NULL)
uri->port = port;
*str = cur;
return(0);
}
return(1);
}
/**
* xmlParse3986Userinfo:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an user information part and fills in the appropriate fields
* of the @uri structure
*
* userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
*
* Returns 0 or the error code
*/
static int
xmlParse3986Userinfo(xmlURIPtr uri, const char **str)
{
const char *cur;
cur = *str;
while (ISA_UNRESERVED(uri, cur) || ISA_PCT_ENCODED(cur) ||
ISA_SUB_DELIM(cur) || (*cur == ':'))
NEXT(cur);
if (*cur == '@') {
if (uri != NULL) {
if (uri->user != NULL) xmlFree(uri->user);
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->user = STRNDUP(*str, cur - *str);
else
uri->user = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->user == NULL)
return(-1);
}
*str = cur;
return(0);
}
return(1);
}
/**
* xmlParse3986DecOctet:
* @str: the string to analyze
*
* dec-octet = DIGIT ; 0-9
* / %x31-39 DIGIT ; 10-99
* / "1" 2DIGIT ; 100-199
* / "2" %x30-34 DIGIT ; 200-249
* / "25" %x30-35 ; 250-255
*
* Skip a dec-octet.
*
* Returns 0 if found and skipped, 1 otherwise
*/
static int
xmlParse3986DecOctet(const char **str) {
const char *cur = *str;
if (!(ISA_DIGIT(cur)))
return(1);
if (!ISA_DIGIT(cur+1))
cur++;
else if ((*cur != '0') && (ISA_DIGIT(cur + 1)) && (!ISA_DIGIT(cur+2)))
cur += 2;
else if ((*cur == '1') && (ISA_DIGIT(cur + 1)) && (ISA_DIGIT(cur + 2)))
cur += 3;
else if ((*cur == '2') && (*(cur + 1) >= '0') &&
(*(cur + 1) <= '4') && (ISA_DIGIT(cur + 2)))
cur += 3;
else if ((*cur == '2') && (*(cur + 1) == '5') &&
(*(cur + 2) >= '0') && (*(cur + 1) <= '5'))
cur += 3;
else
return(1);
*str = cur;
return(0);
}
/**
* xmlParse3986Host:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an host part and fills in the appropriate fields
* of the @uri structure
*
* host = IP-literal / IPv4address / reg-name
* IP-literal = "[" ( IPv6address / IPvFuture ) "]"
* IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
* reg-name = *( unreserved / pct-encoded / sub-delims )
*
* Returns 0 or the error code
*/
static int
xmlParse3986Host(xmlURIPtr uri, const char **str)
{
const char *cur = *str;
const char *host;
host = cur;
/*
* IPv6 and future addressing scheme are enclosed between brackets
*/
if (*cur == '[') {
cur++;
while ((*cur != ']') && (*cur != 0))
cur++;
if (*cur != ']')
return(1);
cur++;
goto found;
}
/*
* try to parse an IPv4
*/
if (ISA_DIGIT(cur)) {
if (xmlParse3986DecOctet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
cur++;
if (xmlParse3986DecOctet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
if (xmlParse3986DecOctet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
if (xmlParse3986DecOctet(&cur) != 0)
goto not_ipv4;
goto found;
not_ipv4:
cur = *str;
}
/*
* then this should be a hostname which can be empty
*/
while (ISA_UNRESERVED(uri, cur) ||
ISA_PCT_ENCODED(cur) || ISA_SUB_DELIM(cur))
NEXT(cur);
found:
if (uri != NULL) {
if (uri->authority != NULL) xmlFree(uri->authority);
uri->authority = NULL;
if (uri->server != NULL) xmlFree(uri->server);
if (cur != host) {
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->server = STRNDUP(host, cur - host);
else
uri->server = xmlURIUnescapeString(host, cur - host, NULL);
if (uri->server == NULL)
return(-1);
} else
uri->server = NULL;
}
*str = cur;
return(0);
}
/**
* xmlParse3986Authority:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an authority part and fills in the appropriate fields
* of the @uri structure
*
* authority = [ userinfo "@" ] host [ ":" port ]
*
* Returns 0 or the error code
*/
static int
xmlParse3986Authority(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
/*
* try to parse an userinfo and check for the trailing @
*/
ret = xmlParse3986Userinfo(uri, &cur);
if (ret < 0)
return(ret);
if ((ret != 0) || (*cur != '@'))
cur = *str;
else
cur++;
ret = xmlParse3986Host(uri, &cur);
if (ret != 0) return(ret);
if (*cur == ':') {
cur++;
ret = xmlParse3986Port(uri, &cur);
if (ret != 0) return(ret);
}
*str = cur;
return(0);
}
/**
* xmlParse3986Segment:
* @str: the string to analyze
* @forbid: an optional forbidden character
* @empty: allow an empty segment
*
* Parse a segment and fills in the appropriate fields
* of the @uri structure
*
* segment = *pchar
* segment-nz = 1*pchar
* segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
* ; non-zero-length segment without any colon ":"
*
* Returns 0 or the error code
*/
static int
xmlParse3986Segment(xmlURIPtr uri, const char **str, char forbid, int empty)
{
const char *cur;
cur = *str;
if (!ISA_PCHAR(uri, cur)) {
if (empty)
return(0);
return(1);
}
while (ISA_PCHAR(uri, cur) && (*cur != forbid))
NEXT(cur);
*str = cur;
return (0);
}
/**
* xmlParse3986PathAbEmpty:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path absolute or empty and fills in the appropriate fields
* of the @uri structure
*
* path-abempty = *( "/" segment )
*
* Returns 0 or the error code
*/
static int
xmlParse3986PathAbEmpty(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
while (*cur == '/') {
cur++;
ret = xmlParse3986Segment(uri, &cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
if (*str != cur) {
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->path = STRNDUP(*str, cur - *str);
else
uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->path == NULL)
return (-1);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* xmlParse3986PathAbsolute:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path absolute and fills in the appropriate fields
* of the @uri structure
*
* path-absolute = "/" [ segment-nz *( "/" segment ) ]
*
* Returns 0 or the error code
*/
static int
xmlParse3986PathAbsolute(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
if (*cur != '/')
return(1);
cur++;
ret = xmlParse3986Segment(uri, &cur, 0, 0);
if (ret == 0) {
while (*cur == '/') {
cur++;
ret = xmlParse3986Segment(uri, &cur, 0, 1);
if (ret != 0) return(ret);
}
}
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
if (cur != *str) {
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->path = STRNDUP(*str, cur - *str);
else
uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->path == NULL)
return (-1);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* xmlParse3986PathRootless:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path without root and fills in the appropriate fields
* of the @uri structure
*
* path-rootless = segment-nz *( "/" segment )
*
* Returns 0 or the error code
*/
static int
xmlParse3986PathRootless(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
ret = xmlParse3986Segment(uri, &cur, 0, 0);
if (ret != 0) return(ret);
while (*cur == '/') {
cur++;
ret = xmlParse3986Segment(uri, &cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
if (cur != *str) {
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->path = STRNDUP(*str, cur - *str);
else
uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->path == NULL)
return (-1);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* xmlParse3986PathNoScheme:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path which is not a scheme and fills in the appropriate fields
* of the @uri structure
*
* path-noscheme = segment-nz-nc *( "/" segment )
*
* Returns 0 or the error code
*/
static int
xmlParse3986PathNoScheme(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
ret = xmlParse3986Segment(uri, &cur, ':', 0);
if (ret != 0) return(ret);
while (*cur == '/') {
cur++;
ret = xmlParse3986Segment(uri, &cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
if (cur != *str) {
if (uri->cleanup & XML_URI_NO_UNESCAPE)
uri->path = STRNDUP(*str, cur - *str);
else
uri->path = xmlURIUnescapeString(*str, cur - *str, NULL);
if (uri->path == NULL)
return (-1);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* xmlParse3986HierPart:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an hierarchical part and fills in the appropriate fields
* of the @uri structure
*
* hier-part = "//" authority path-abempty
* / path-absolute
* / path-rootless
* / path-empty
*
* Returns 0 or the error code
*/
static int
xmlParse3986HierPart(xmlURIPtr uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
if ((*cur == '/') && (*(cur + 1) == '/')) {
cur += 2;
ret = xmlParse3986Authority(uri, &cur);
if (ret != 0) return(ret);
/*
* An empty server is marked with a special URI value.
*/
if ((uri->server == NULL) && (uri->port == PORT_EMPTY))
uri->port = PORT_EMPTY_SERVER;
ret = xmlParse3986PathAbEmpty(uri, &cur);
if (ret != 0) return(ret);
*str = cur;
return(0);
} else if (*cur == '/') {
ret = xmlParse3986PathAbsolute(uri, &cur);
if (ret != 0) return(ret);
} else if (ISA_PCHAR(uri, cur)) {
ret = xmlParse3986PathRootless(uri, &cur);
if (ret != 0) return(ret);
} else {
/* path-empty is effectively empty */
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* xmlParse3986RelativeRef:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI string and fills in the appropriate fields
* of the @uri structure
*
* relative-ref = relative-part [ "?" query ] [ "#" fragment ]
* relative-part = "//" authority path-abempty
* / path-absolute
* / path-noscheme
* / path-empty
*
* Returns 0 or the error code
*/
static int
xmlParse3986RelativeRef(xmlURIPtr uri, const char *str) {
int ret;
if ((*str == '/') && (*(str + 1) == '/')) {
str += 2;
ret = xmlParse3986Authority(uri, &str);
if (ret != 0) return(ret);
ret = xmlParse3986PathAbEmpty(uri, &str);
if (ret != 0) return(ret);
} else if (*str == '/') {
ret = xmlParse3986PathAbsolute(uri, &str);
if (ret != 0) return(ret);
} else if (ISA_PCHAR(uri, str)) {
ret = xmlParse3986PathNoScheme(uri, &str);
if (ret != 0) return(ret);
} else {
/* path-empty is effectively empty */
if (uri != NULL) {
if (uri->path != NULL) xmlFree(uri->path);
uri->path = NULL;
}
}
if (*str == '?') {
str++;
ret = xmlParse3986Query(uri, &str);
if (ret != 0) return(ret);
}
if (*str == '#') {
str++;
ret = xmlParse3986Fragment(uri, &str);
if (ret != 0) return(ret);
}
if (*str != 0) {
xmlCleanURI(uri);
return(1);
}
return(0);
}
/**
* xmlParse3986URI:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI string and fills in the appropriate fields
* of the @uri structure
*
* scheme ":" hier-part [ "?" query ] [ "#" fragment ]
*
* Returns 0 or the error code
*/
static int
xmlParse3986URI(xmlURIPtr uri, const char *str) {
int ret;
ret = xmlParse3986Scheme(uri, &str);
if (ret != 0) return(ret);
if (*str != ':') {
return(1);
}
str++;
ret = xmlParse3986HierPart(uri, &str);
if (ret != 0) return(ret);
if (*str == '?') {
str++;
ret = xmlParse3986Query(uri, &str);
if (ret != 0) return(ret);
}
if (*str == '#') {
str++;
ret = xmlParse3986Fragment(uri, &str);
if (ret != 0) return(ret);
}
if (*str != 0) {
xmlCleanURI(uri);
return(1);
}
return(0);
}
/**
* xmlParse3986URIReference:
* @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 = URI / relative-ref
*
* Returns 0 or the error code
*/
static int
xmlParse3986URIReference(xmlURIPtr uri, const char *str) {
int ret;
if (str == NULL)
return(-1);
xmlCleanURI(uri);
/*
* Try first to parse absolute refs, then fallback to relative if
* it fails.
*/
ret = xmlParse3986URI(uri, str);
if (ret < 0)
return(ret);
if (ret != 0) {
xmlCleanURI(uri);
ret = xmlParse3986RelativeRef(uri, str);
if (ret != 0) {
xmlCleanURI(uri);
return(ret);
}
}
return(0);
}
/**
* xmlParseURISafe:
* @str: the URI string to analyze
* @uriOut: optional pointer to parsed URI
*
* Parse an URI based on RFC 3986
*
* URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
*
* Available since 2.13.0.
*
* Returns 0 on success, an error code (typically 1) if the URI is invalid
* or -1 if a memory allocation failed.
*/
int
xmlParseURISafe(const char *str, xmlURIPtr *uriOut) {
xmlURIPtr uri;
int ret;
if (uriOut == NULL)
return(1);
*uriOut = NULL;
if (str == NULL)
return(1);
uri = xmlCreateURI();
if (uri == NULL)
return(-1);
ret = xmlParse3986URIReference(uri, str);
if (ret) {
xmlFreeURI(uri);
return(ret);
}
*uriOut = uri;
return(0);
}
/**
* xmlParseURI:
* @str: the URI string to analyze
*
* Parse an URI based on RFC 3986
*
* URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
*
* Returns a newly built xmlURIPtr or NULL in case of error
*/
xmlURIPtr
xmlParseURI(const char *str) {
xmlURIPtr uri;
xmlParseURISafe(str, &uri);
return(uri);
}
/**
* xmlParseURIReference:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI reference string based on RFC 3986 and fills in the
* appropriate fields of the @uri structure
*
* URI-reference = URI / relative-ref
*
* Returns 0 or the error code
*/
int
xmlParseURIReference(xmlURIPtr uri, const char *str) {
return(xmlParse3986URIReference(uri, str));
}
/**
* xmlParseURIRaw:
* @str: the URI string to analyze
* @raw: if 1 unescaping of URI pieces are disabled
*
* Parse an URI but allows to keep intact the original fragments.
*
* URI-reference = URI / relative-ref
*
* Returns a newly built xmlURIPtr or NULL in case of error
*/
xmlURIPtr
xmlParseURIRaw(const char *str, int raw) {
xmlURIPtr uri;
int ret;
if (str == NULL)
return(NULL);
uri = xmlCreateURI();
if (uri != NULL) {
if (raw) {
uri->cleanup |= XML_URI_NO_UNESCAPE;
}
ret = xmlParseURIReference(uri, str);
if (ret) {
xmlFreeURI(uri);
return(NULL);
}
}
return(uri);
}
/************************************************************************
* *
* 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)
return(NULL);
memset(ret, 0, sizeof(xmlURI));
ret->port = PORT_EMPTY;
return(ret);
}
/**
* xmlSaveUriRealloc:
*
* Function to handle properly a reallocation when saving an URI
* Also imposes some limit on the length of an URI string output
*/
static xmlChar *
xmlSaveUriRealloc(xmlChar *ret, int *max) {
xmlChar *temp;
int tmp;
if (*max > MAX_URI_LENGTH)
return(NULL);
tmp = *max * 2;
temp = (xmlChar *) xmlRealloc(ret, (tmp + 1));
if (temp == NULL)
return(NULL);
*max = tmp;
return(temp);
}
/**
* 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;
xmlChar *temp;
const char *p;
int len;
int max;
if (uri == NULL) return(NULL);
max = 80;
ret = (xmlChar *) xmlMallocAtomic(max + 1);
if (ret == NULL)
return(NULL);
len = 0;
if (uri->scheme != NULL) {
p = uri->scheme;
while (*p != 0) {
if (len >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = *p++;
}
if (len >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = ':';
}
if (uri->opaque != NULL) {
p = uri->opaque;
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
if (IS_RESERVED(*(p)) || IS_UNRESERVED(*(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->server != NULL) || (uri->port != PORT_EMPTY)) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '/';
ret[len++] = '/';
if (uri->user != NULL) {
p = uri->user;
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
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) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '@';
}
if (uri->server != NULL) {
p = uri->server;
while (*p != 0) {
if (len >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
/* TODO: escaping? */
ret[len++] = (xmlChar) *p++;
}
}
if (uri->port > 0) {
if (len + 10 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
len += snprintf((char *) &ret[len], max - len, ":%d", uri->port);
}
} else if (uri->authority != NULL) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '/';
ret[len++] = '/';
p = uri->authority;
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) ||
((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
} else if (uri->scheme != NULL) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
}
if (uri->path != NULL) {
p = uri->path;
/*
* the colon in file:///d: should not be escaped or
* Windows accesses fail later.
*/
if ((uri->scheme != NULL) &&
(p[0] == '/') &&
(((p[1] >= 'a') && (p[1] <= 'z')) ||
((p[1] >= 'A') && (p[1] <= 'Z'))) &&
(p[2] == ':') &&
(xmlStrEqual(BAD_CAST uri->scheme, BAD_CAST "file"))) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = *p++;
ret[len++] = *p++;
ret[len++] = *p++;
}
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) ||
((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) ||
((*(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_raw != NULL) {
if (len + 1 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '?';
p = uri->query_raw;
while (*p != 0) {
if (len + 1 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = *p++;
}
} else if (uri->query != NULL) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '?';
p = uri->query;
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
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) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len++] = '#';
p = uri->fragment;
while (*p != 0) {
if (len + 3 >= max) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
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) {
temp = xmlSaveUriRealloc(ret, &max);
if (temp == NULL) goto mem_error;
ret = temp;
}
ret[len] = 0;
return(ret);
mem_error:
xmlFree(ret);
return(NULL);
}
/**
* xmlPrintURI:
* @stream: a FILE* for the output
* @uri: pointer to an xmlURI
*
* Prints the URI in the stream @stream.
*/
void
xmlPrintURI(FILE *stream, xmlURIPtr uri) {
xmlChar *out;
out = xmlSaveUri(uri);
if (out != NULL) {
fprintf(stream, "%s", (char *) 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;
if (uri->query_raw != NULL) xmlFree(uri->query_raw);
uri->query_raw = 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);
if (uri->query_raw != NULL) xmlFree(uri->query_raw);
xmlFree(uri);
}
/************************************************************************
* *
* Helper functions *
* *
************************************************************************/
static int
xmlIsPathSeparator(int c, int isFile) {
(void) isFile;
if (c == '/')
return(1);
#ifdef _WIN32
if (isFile && (c == '\\'))
return(1);
#endif
return(0);
}
/**
* xmlNormalizePath:
* @path: pointer to the path string
* @isFile: true for filesystem paths, false for URIs
*
* Normalize a filesystem path or URI.
*
* Returns 0 or an error code
*/
static int
xmlNormalizePath(char *path, int isFile) {
char *cur, *out;
int numSeg = 0;
if (path == NULL)
return(-1);
cur = path;
out = path;
if (*cur == 0)
return(0);
if (xmlIsPathSeparator(*cur, isFile)) {
cur++;
*out++ = '/';
}
while (*cur != 0) {
/*
* At this point, out is either empty or ends with a separator.
* Collapse multiple separators first.
*/
while (xmlIsPathSeparator(*cur, isFile)) {
#ifdef _WIN32
/* Allow two separators at start of path */
if ((isFile) && (out == path + 1))
*out++ = '/';
#endif
cur++;
}
if (*cur == '.') {
if (cur[1] == 0) {
/* Ignore "." at end of path */
break;
} else if (xmlIsPathSeparator(cur[1], isFile)) {
/* Skip "./" */
cur += 2;
continue;
} else if ((cur[1] == '.') &&
((cur[2] == 0) || xmlIsPathSeparator(cur[2], isFile))) {
if (numSeg > 0) {
/* Handle ".." by removing last segment */
do {
out--;
} while ((out > path) &&
!xmlIsPathSeparator(out[-1], isFile));
numSeg--;
if (cur[2] == 0)
break;
cur += 3;
continue;
} else if (out[0] == '/') {
/* Ignore extraneous ".." in absolute paths */
if (cur[2] == 0)
break;
cur += 3;
continue;
} else {
/* Keep "../" at start of relative path */
numSeg--;
}
}
}
/* Copy segment */
while ((*cur != 0) && !xmlIsPathSeparator(*cur, isFile)) {
*out++ = *cur++;
}
/* Copy separator */
if (*cur != 0) {
cur++;
*out++ = '/';
}
numSeg++;
}
/* Keep "." if output is empty and it's a file */
if ((isFile) && (out <= path))
*out++ = '.';
*out = 0;
return(0);
}
/**
* 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) {
return(xmlNormalizePath(path, 0));
}
static int is_hex(char c) {
if (((c >= '0') && (c <= '9')) ||
((c >= 'a') && (c <= 'f')) ||
((c >= 'A') && (c <= 'F')))
return(1);
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, but does not check that the string is an URI. The
* output is a direct unsigned char translation of %XX values (no encoding)
* Note that the length of the result can only be smaller or same size as
* the input string.
*
* Returns a copy of the string, but unescaped, will return NULL only in case
* of error
*/
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 *) xmlMallocAtomic(len + 1);
if (ret == NULL)
return(NULL);
} else
ret = target;
in = str;
out = ret;
while(len > 0) {
if ((len > 2) && (*in == '%') && (is_hex(in[1])) && (is_hex(in[2]))) {
int c = 0;
in++;
if ((*in >= '0') && (*in <= '9'))
c = (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
c = (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
c = (*in - 'A') + 10;
in++;
if ((*in >= '0') && (*in <= '9'))
c = c * 16 + (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
c = c * 16 + (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
c = c * 16 + (*in - 'A') + 10;
in++;
len -= 3;
/* Explicit sign change */
*out++ = (char) c;
} 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 unreserved characters
* a-z, A-Z, 0-9, "-._~", a few sub-delims "!*'()", the gen-delim "@"
* (why?) 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;
xmlChar *temp;
const xmlChar *in;
int len, out;
if (str == NULL)
return(NULL);
if (str[0] == 0)
return(xmlStrdup(str));
len = xmlStrlen(str);
len += 20;
ret = (xmlChar *) xmlMallocAtomic(len);
if (ret == NULL)
return(NULL);
in = (const xmlChar *) str;
out = 0;
while(*in != 0) {
if (len - out <= 3) {
if (len > INT_MAX / 2)
return(NULL);
temp = xmlRealloc(ret, len * 2);
if (temp == NULL) {
xmlFree(ret);
return(NULL);
}
ret = temp;
len *= 2;
}
ch = *in;
if ((ch != '@') && (!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;
if (str == NULL)
return (NULL);
uri = xmlCreateURI();
if (uri != NULL) {
/*
* Allow escaping errors in the unescaped form
*/
uri->cleanup = XML_URI_ALLOW_UNWISE;
ret2 = xmlParseURIReference(uri, (const char *)str);
if (ret2) {
xmlFreeURI(uri);
return (NULL);
}
}
if (!uri)
return NULL;
ret = NULL;
#define NULLCHK(p) if(!p) { \
xmlFreeURI(uri); \
xmlFree(ret); \
return 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 ";:&=+$,");
NULLCHK(segment)
ret = xmlStrcat(ret,BAD_CAST "//");
ret = xmlStrcat(ret, segment);
ret = xmlStrcat(ret, BAD_CAST "@");
xmlFree(segment);
}
if (uri->server) {
segment = xmlURIEscapeStr(BAD_CAST uri->server, BAD_CAST "/?;:@");
NULLCHK(segment)
if (uri->user == NULL)
ret = xmlStrcat(ret, BAD_CAST "//");
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->port > 0) {
xmlChar port[11];
snprintf((char *) port, 11, "%d", uri->port);
ret = xmlStrcat(ret, BAD_CAST ":");
ret = xmlStrcat(ret, port);
}
if (uri->path) {
segment =
xmlURIEscapeStr(BAD_CAST uri->path, BAD_CAST ":@&=+$,/?;");
NULLCHK(segment)
ret = xmlStrcat(ret, segment);
xmlFree(segment);
}
if (uri->query_raw) {
ret = xmlStrcat(ret, BAD_CAST "?");
ret = xmlStrcat(ret, BAD_CAST uri->query_raw);
}
else 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);
}
/************************************************************************
* *
* Public functions *
* *
************************************************************************/
static int
xmlIsAbsolutePath(const xmlChar *path) {
int c = path[0];
if (xmlIsPathSeparator(c, 1))
return(1);
#ifdef _WIN32
if ((((c >= 'A') && (c <= 'Z')) ||
((c >= 'a') && (c <= 'z'))) &&
(path[1] == ':'))
return(1);
#endif
return(0);
}
/**
* xmlResolvePath:
* @ref: the filesystem path
* @base: the base value
* @out: pointer to result URI
*
* Resolves a filesystem path from a base path.
*
* Returns 0 on success, -1 if a memory allocation failed or an error
* code if URI or base are invalid.
*/
static int
xmlResolvePath(const xmlChar *escRef, const xmlChar *base, xmlChar **out) {
const xmlChar *fragment;
xmlChar *tmp = NULL;
xmlChar *ref = NULL;
xmlChar *result = NULL;
int ret = -1;
int i;
if (out == NULL)
return(1);
*out = NULL;
if ((escRef == NULL) || (escRef[0] == 0)) {
if ((base == NULL) || (base[0] == 0))
return(1);
ref = xmlStrdup(base);
if (ref == NULL)
goto err_memory;
*out = ref;
return(0);
}
/*
* If a URI is resolved, we can assume it is a valid URI and not
* a filesystem path. This means we have to unescape the part
* before the fragment.
*/
fragment = xmlStrchr(escRef, '#');
if (fragment != NULL) {
tmp = xmlStrndup(escRef, fragment - escRef);
if (tmp == NULL)
goto err_memory;
escRef = tmp;
}
ref = (xmlChar *) xmlURIUnescapeString((char *) escRef, -1, NULL);
if (ref == NULL)
goto err_memory;
if ((base == NULL) || (base[0] == 0))
goto done;
if (xmlIsAbsolutePath(ref))
goto done;
/*
* Remove last segment from base
*/
i = xmlStrlen(base);
while ((i > 0) && !xmlIsPathSeparator(base[i-1], 1))
i--;
/*
* Concatenate base and ref
*/
if (i > 0) {
int refLen = xmlStrlen(ref);
result = xmlMalloc(i + refLen + 1);
if (result == NULL)
goto err_memory;
memcpy(result, base, i);
memcpy(result + i, ref, refLen + 1);
}
/*
* Normalize
*/
xmlNormalizePath((char *) result, 1);
done:
if (result == NULL) {
result = ref;
ref = NULL;
}
if (fragment != NULL) {
result = xmlStrcat(result, fragment);
if (result == NULL)
goto err_memory;
}
*out = result;
ret = 0;
err_memory:
xmlFree(tmp);
xmlFree(ref);
return(ret);
}
/**
* xmlBuildURISafe:
* @URI: the URI instance found in the document
* @base: the base value
* @valPtr: pointer to result URI
*
* 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
*
* Available since 2.13.0.
*
* Returns 0 on success, -1 if a memory allocation failed or an error
* code if URI or base are invalid.
*/
int
xmlBuildURISafe(const xmlChar *URI, const xmlChar *base, xmlChar **valPtr) {
xmlChar *val = NULL;
int ret, len, indx, cur, out;
xmlURIPtr ref = NULL;
xmlURIPtr bas = NULL;
xmlURIPtr res = NULL;
if (valPtr == NULL)
return(1);
*valPtr = NULL;
if (URI == NULL)
return(1);
if (base == NULL) {
val = xmlStrdup(URI);
if (val == NULL)
return(-1);
*valPtr = val;
return(0);
}
/*
* 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[0] != 0)
ret = xmlParseURISafe((const char *) URI, &ref);
else
ret = 0;
if (ret != 0)
goto done;
if ((ref != NULL) && (ref->scheme != NULL)) {
/*
* The URI is absolute don't modify.
*/
val = xmlStrdup(URI);
if (val == NULL)
ret = -1;
goto done;
}
/*
* If base has no scheme or authority, it is assumed to be a
* filesystem path.
*/
if (xmlStrstr(base, BAD_CAST "://") == NULL) {
xmlFreeURI(ref);
return(xmlResolvePath(URI, base, valPtr));
}
ret = xmlParseURISafe((const char *) base, &bas);
if (ret < 0)
goto done;
if (ret != 0) {
if (ref) {
ret = 0;
val = xmlSaveUri(ref);
if (val == NULL)
ret = -1;
}
goto done;
}
if (ref == NULL) {
/*
* the base fragment must be ignored
*/
if (bas->fragment != NULL) {
xmlFree(bas->fragment);
bas->fragment = NULL;
}
val = xmlSaveUri(bas);
if (val == NULL)
ret = -1;
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.
*/
ret = -1;
res = xmlCreateURI();
if (res == NULL)
goto done;
if ((ref->scheme == NULL) && (ref->path == NULL) &&
((ref->authority == NULL) && (ref->server == NULL) &&
(ref->port == PORT_EMPTY))) {
if (bas->scheme != NULL) {
res->scheme = xmlMemStrdup(bas->scheme);
if (res->scheme == NULL)
goto done;
}
if (bas->authority != NULL) {
res->authority = xmlMemStrdup(bas->authority);
if (res->authority == NULL)
goto done;
} else {
if (bas->server != NULL) {
res->server = xmlMemStrdup(bas->server);
if (res->server == NULL)
goto done;
}
if (bas->user != NULL) {
res->user = xmlMemStrdup(bas->user);
if (res->user == NULL)
goto done;
}
res->port = bas->port;
}
if (bas->path != NULL) {
res->path = xmlMemStrdup(bas->path);
if (res->path == NULL)
goto done;
}
if (ref->query_raw != NULL) {
res->query_raw = xmlMemStrdup (ref->query_raw);
if (res->query_raw == NULL)
goto done;
} else if (ref->query != NULL) {
res->query = xmlMemStrdup(ref->query);
if (res->query == NULL)
goto done;
} else if (bas->query_raw != NULL) {
res->query_raw = xmlMemStrdup(bas->query_raw);
if (res->query_raw == NULL)
goto done;
} else if (bas->query != NULL) {
res->query = xmlMemStrdup(bas->query);
if (res->query == NULL)
goto done;
}
if (ref->fragment != NULL) {
res->fragment = xmlMemStrdup(ref->fragment);
if (res->fragment == NULL)
goto done;
}
goto step_7;
}
/*
* 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);
if (val != NULL)
ret = 0;
goto done;
}
if (bas->scheme != NULL) {
res->scheme = xmlMemStrdup(bas->scheme);
if (res->scheme == NULL)
goto done;
}
if (ref->query_raw != NULL) {
res->query_raw = xmlMemStrdup(ref->query_raw);
if (res->query_raw == NULL)
goto done;
} else if (ref->query != NULL) {
res->query = xmlMemStrdup(ref->query);
if (res->query == NULL)
goto done;
}
if (ref->fragment != NULL) {
res->fragment = xmlMemStrdup(ref->fragment);
if (res->fragment == NULL)
goto done;
}
/*
* 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) ||
(ref->port != PORT_EMPTY)) {
if (ref->authority != NULL) {
res->authority = xmlMemStrdup(ref->authority);
if (res->authority == NULL)
goto done;
} else {
if (ref->server != NULL) {
res->server = xmlMemStrdup(ref->server);
if (res->server == NULL)
goto done;
}
if (ref->user != NULL) {
res->user = xmlMemStrdup(ref->user);
if (res->user == NULL)
goto done;
}
res->port = ref->port;
}
if (ref->path != NULL) {
res->path = xmlMemStrdup(ref->path);
if (res->path == NULL)
goto done;
}
goto step_7;
}
if (bas->authority != NULL) {
res->authority = xmlMemStrdup(bas->authority);
if (res->authority == NULL)
goto done;
} else if ((bas->server != NULL) || (bas->port != PORT_EMPTY)) {
if (bas->server != NULL) {
res->server = xmlMemStrdup(bas->server);
if (res->server == NULL)
goto done;
}
if (bas->user != NULL) {
res->user = xmlMemStrdup(bas->user);
if (res->user == NULL)
goto done;
}
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);
if (res->path == NULL)
goto done;
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 *) xmlMallocAtomic(len);
if (res->path == NULL)
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) || bas->port != PORT_EMPTY))
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);
if (val != NULL)
ret = 0;
done:
if (ref != NULL)
xmlFreeURI(ref);
if (bas != NULL)
xmlFreeURI(bas);
if (res != NULL)
xmlFreeURI(res);
*valPtr = val;
return(ret);
}
/**
* 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 *out;
xmlBuildURISafe(URI, base, &out);
return(out);
}
/**
* xmlBuildRelativeURISafe:
* @URI: the URI reference under consideration
* @base: the base value
* @valPtr: pointer to result URI
*
* Expresses the URI of the reference in terms relative to the
* base. Some examples of this operation include:
* base = "http://site1.com/docs/book1.html"
* URI input URI returned
* docs/pic1.gif pic1.gif
* docs/img/pic1.gif img/pic1.gif
* img/pic1.gif ../img/pic1.gif
* http://site1.com/docs/pic1.gif pic1.gif
* http://site2.com/docs/pic1.gif http://site2.com/docs/pic1.gif
*
* base = "docs/book1.html"
* URI input URI returned
* docs/pic1.gif pic1.gif
* docs/img/pic1.gif img/pic1.gif
* img/pic1.gif ../img/pic1.gif
* http://site1.com/docs/pic1.gif http://site1.com/docs/pic1.gif
*
*
* Note: if the URI reference is really weird or complicated, it may be
* worthwhile to first convert it into a "nice" one by calling
* xmlBuildURI (using 'base') before calling this routine,
* since this routine (for reasonable efficiency) assumes URI has
* already been through some validation.
*
* Available since 2.13.0.
*
* Returns 0 on success, -1 if a memory allocation failed or an error
* code if URI or base are invalid.
*/
int
xmlBuildRelativeURISafe(const xmlChar * URI, const xmlChar * base,
xmlChar **valPtr)
{
xmlChar *val = NULL;
int ret = 0;
int ix;
int nbslash = 0;
int len;
xmlURIPtr ref = NULL;
xmlURIPtr bas = NULL;
xmlChar *bptr, *uptr, *vptr;
int remove_path = 0;
if (valPtr == NULL)
return(1);
*valPtr = NULL;
if ((URI == NULL) || (*URI == 0))
return(1);
/*
* First parse URI into a standard form
*/
ref = xmlCreateURI ();
if (ref == NULL) {
ret = -1;
goto done;
}
/* If URI not already in "relative" form */
if (URI[0] != '.') {
ret = xmlParseURIReference (ref, (const char *) URI);
if (ret != 0)
goto done; /* Error in URI, return NULL */
} else {
ref->path = (char *)xmlStrdup(URI);
if (ref->path == NULL) {
ret = -1;
goto done;
}
}
/*
* Next parse base into the same standard form
*/
if ((base == NULL) || (*base == 0)) {
val = xmlStrdup (URI);
if (val == NULL)
ret = -1;
goto done;
}
bas = xmlCreateURI ();
if (bas == NULL) {
ret = -1;
goto done;
}
if (base[0] != '.') {
ret = xmlParseURIReference (bas, (const char *) base);
if (ret != 0)
goto done; /* Error in base, return NULL */
} else {
bas->path = (char *)xmlStrdup(base);
if (bas->path == NULL) {
ret = -1;
goto done;
}
}
/*
* If the scheme / server on the URI differs from the base,
* just return the URI
*/
if ((ref->scheme != NULL) &&
((bas->scheme == NULL) ||
(xmlStrcmp ((xmlChar *)bas->scheme, (xmlChar *)ref->scheme)) ||
(xmlStrcmp ((xmlChar *)bas->server, (xmlChar *)ref->server)) ||
(bas->port != ref->port))) {
val = xmlStrdup (URI);
if (val == NULL)
ret = -1;
goto done;
}
if (xmlStrEqual((xmlChar *)bas->path, (xmlChar *)ref->path)) {
val = xmlStrdup(BAD_CAST "");
if (val == NULL)
ret = -1;
goto done;
}
if (bas->path == NULL) {
val = xmlStrdup((xmlChar *)ref->path);
if (val == NULL)
ret = -1;
goto done;
}
if (ref->path == NULL) {
ref->path = (char *) "/";
remove_path = 1;
}
/*
* At this point (at last!) we can compare the two paths
*
* First we take care of the special case where either of the
* two path components may be missing (bug 316224)
*/
bptr = (xmlChar *)bas->path;
{
xmlChar *rptr = (xmlChar *) ref->path;
int pos = 0;
/*
* Next we compare the two strings and find where they first differ
*/
if ((*rptr == '.') && (rptr[1] == '/'))
rptr += 2;
if ((*bptr == '.') && (bptr[1] == '/'))
bptr += 2;
else if ((*bptr == '/') && (*rptr != '/'))
bptr++;
while ((bptr[pos] == rptr[pos]) && (bptr[pos] != 0))
pos++;
if (bptr[pos] == rptr[pos]) {
val = xmlStrdup(BAD_CAST "");
if (val == NULL)
ret = -1;
goto done; /* (I can't imagine why anyone would do this) */
}
/*
* In URI, "back up" to the last '/' encountered. This will be the
* beginning of the "unique" suffix of URI
*/
ix = pos;
for (; ix > 0; ix--) {
if (rptr[ix - 1] == '/')
break;
}
uptr = (xmlChar *)&rptr[ix];
/*
* In base, count the number of '/' from the differing point
*/
for (; bptr[ix] != 0; ix++) {
if (bptr[ix] == '/')
nbslash++;
}
/*
* e.g: URI="foo/" base="foo/bar" -> "./"
*/
if (nbslash == 0 && !uptr[0]) {
val = xmlStrdup(BAD_CAST "./");
if (val == NULL)
ret = -1;
goto done;
}
len = xmlStrlen (uptr) + 1;
}
if (nbslash == 0) {
if (uptr != NULL) {
/* exception characters from xmlSaveUri */
val = xmlURIEscapeStr(uptr, BAD_CAST "/;&=+$,");
if (val == NULL)
ret = -1;
}
goto done;
}
/*
* Allocate just enough space for the returned string -
* length of the remainder of the URI, plus enough space
* for the "../" groups, plus one for the terminator
*/
val = (xmlChar *) xmlMalloc (len + 3 * nbslash);
if (val == NULL) {
ret = -1;
goto done;
}
vptr = val;
/*
* Put in as many "../" as needed
*/
for (; nbslash>0; nbslash--) {
*vptr++ = '.';
*vptr++ = '.';
*vptr++ = '/';
}
/*
* Finish up with the end of the URI
*/
if (uptr != NULL) {
if ((vptr > val) && (len > 0) &&
(uptr[0] == '/') && (vptr[-1] == '/')) {
memcpy (vptr, uptr + 1, len - 1);
vptr[len - 2] = 0;
} else {
memcpy (vptr, uptr, len);
vptr[len - 1] = 0;
}
} else {
vptr[len - 1] = 0;
}
/* escape the freshly-built path */
vptr = val;
/* exception characters from xmlSaveUri */
val = xmlURIEscapeStr(vptr, BAD_CAST "/;&=+$,");
if (val == NULL)
ret = -1;
else
ret = 0;
xmlFree(vptr);
done:
/*
* Free the working variables
*/
if (remove_path != 0)
ref->path = NULL;
if (ref != NULL)
xmlFreeURI (ref);
if (bas != NULL)
xmlFreeURI (bas);
if (ret != 0) {
xmlFree(val);
val = NULL;
}
*valPtr = val;
return(ret);
}
/*
* xmlBuildRelativeURI:
* @URI: the URI reference under consideration
* @base: the base value
*
* See xmlBuildRelativeURISafe.
*
* Returns a new URI string (to be freed by the caller) or NULL in case
* error.
*/
xmlChar *
xmlBuildRelativeURI(const xmlChar * URI, const xmlChar * base)
{
xmlChar *val;
xmlBuildRelativeURISafe(URI, base, &val);
return(val);
}
/**
* xmlCanonicPath:
* @path: the resource locator in a filesystem notation
*
* Prepares a path.
*
* If the path contains the substring "://", it is considered a
* Legacy Extended IRI. Characters which aren't allowed in URIs are
* escaped.
*
* Otherwise, the path is considered a filesystem path which is
* copied without modification.
*
* The caller is responsible for freeing the memory occupied
* by the returned string. If there is insufficient memory available, or the
* argument is NULL, the function returns NULL.
*
* Returns the escaped path.
*/
xmlChar *
xmlCanonicPath(const xmlChar *path)
{
xmlChar *ret;
if (path == NULL)
return(NULL);
/* Check if this is an "absolute uri" */
if (xmlStrstr(path, BAD_CAST "://") != NULL) {
/*
* Escape all characters except reserved, unreserved and the
* percent sign.
*
* xmlURIEscapeStr already keeps unreserved characters, so we
* pass gen-delims, sub-delims and "%" to ignore.
*/
ret = xmlURIEscapeStr(path, BAD_CAST ":/?#[]@!$&()*+,;='%");
} else {
ret = xmlStrdup((const xmlChar *) path);
}
return(ret);
}
/**
* xmlPathToURI:
* @path: the resource locator in a filesystem notation
*
* Constructs an URI expressing the existing path
*
* Returns a new URI, or a duplicate of the path parameter if the
* construction fails. The caller is responsible for freeing the memory
* occupied by the returned string. If there is insufficient memory available,
* or the argument is NULL, the function returns NULL.
*/
xmlChar *
xmlPathToURI(const xmlChar *path)
{
return(xmlCanonicPath(path));
}
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