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+/**
+ * uri.c: set of generic URI related routines
+ *
+ * Reference: RFCs 3986, 2732 and 2373
+ *
+ * Copyright (C) 1998-2003 Daniel Veillard. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * DANIEL VEILLARD BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Daniel Veillard shall not
+ * be used in advertising or otherwise to promote the sale, use or other
+ * dealings in this Software without prior written authorization from him.
+ *
+ * daniel@veillard.com
+ *
+ **
+ *
+ * Copyright (C) 2007, 2009-2010 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Authors:
+ * Richard W.M. Jones <rjones@redhat.com>
+ *
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "qemu/uri.h"
+
+static void uri_clean(URI *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 | "$" | "," |
+ * ";" | ":" | "@" | "&" | "=" | "+" )
+ *
+ * path = [ abs_path | opaque_part ]
+ */
+
+
+/************************************************************************
+ * *
+ * RFC 3986 parser *
+ * *
+ ************************************************************************/
+
+#define ISA_DIGIT(p) ((*(p) >= '0') && (*(p) <= '9'))
+#define ISA_ALPHA(p) (((*(p) >= 'a') && (*(p) <= 'z')) || \
+ ((*(p) >= 'A') && (*(p) <= 'Z')))
+#define ISA_HEXDIG(p) \
+ (ISA_DIGIT(p) || ((*(p) >= 'a') && (*(p) <= 'f')) || \
+ ((*(p) >= 'A') && (*(p) <= 'F')))
+
+/*
+ * sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
+ * / "*" / "+" / "," / ";" / "="
+ */
+#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_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(p) \
+ (ISA_UNRESERVED(p) || ISA_PCT_ENCODED(p) || ISA_SUB_DELIM(p) || \
+ ((*(p) == ':')) || ((*(p) == '@')))
+
+/**
+ * rfc3986_parse_scheme:
+ * @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
+rfc3986_parse_scheme(URI *uri, const char **str) {
+ const char *cur;
+
+ if (str == NULL)
+ return(-1);
+
+ cur = *str;
+ if (!ISA_ALPHA(cur))
+ return(2);
+ cur++;
+ while (ISA_ALPHA(cur) || ISA_DIGIT(cur) ||
+ (*cur == '+') || (*cur == '-') || (*cur == '.')) cur++;
+ if (uri != NULL) {
+ if (uri->scheme != NULL) g_free(uri->scheme);
+ uri->scheme = g_strndup(*str, cur - *str);
+ }
+ *str = cur;
+ return(0);
+}
+
+/**
+ * rfc3986_parse_fragment:
+ * @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
+rfc3986_parse_fragment(URI *uri, const char **str)
+{
+ const char *cur;
+
+ if (str == NULL)
+ return (-1);
+
+ cur = *str;
+
+ while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') ||
+ (*cur == '[') || (*cur == ']') ||
+ ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur))))
+ NEXT(cur);
+ if (uri != NULL) {
+ if (uri->fragment != NULL)
+ g_free(uri->fragment);
+ if (uri->cleanup & 2)
+ uri->fragment = g_strndup(*str, cur - *str);
+ else
+ uri->fragment = uri_string_unescape(*str, cur - *str, NULL);
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_query:
+ * @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
+rfc3986_parse_query(URI *uri, const char **str)
+{
+ const char *cur;
+
+ if (str == NULL)
+ return (-1);
+
+ cur = *str;
+
+ while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') ||
+ ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur))))
+ NEXT(cur);
+ if (uri != NULL) {
+ if (uri->query != NULL)
+ g_free (uri->query);
+ uri->query = g_strndup (*str, cur - *str);
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_port:
+ * @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
+rfc3986_parse_port(URI *uri, const char **str)
+{
+ const char *cur = *str;
+
+ if (ISA_DIGIT(cur)) {
+ if (uri != NULL)
+ uri->port = 0;
+ while (ISA_DIGIT(cur)) {
+ if (uri != NULL)
+ uri->port = uri->port * 10 + (*cur - '0');
+ cur++;
+ }
+ *str = cur;
+ return(0);
+ }
+ return(1);
+}
+
+/**
+ * rfc3986_parse_user_info:
+ * @uri: pointer to an URI structure
+ * @str: the string to analyze
+ *
+ * Parse an user informations 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
+rfc3986_parse_user_info(URI *uri, const char **str)
+{
+ const char *cur;
+
+ cur = *str;
+ while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) ||
+ ISA_SUB_DELIM(cur) || (*cur == ':'))
+ NEXT(cur);
+ if (*cur == '@') {
+ if (uri != NULL) {
+ if (uri->user != NULL) g_free(uri->user);
+ if (uri->cleanup & 2)
+ uri->user = g_strndup(*str, cur - *str);
+ else
+ uri->user = uri_string_unescape(*str, cur - *str, NULL);
+ }
+ *str = cur;
+ return(0);
+ }
+ return(1);
+}
+
+/**
+ * rfc3986_parse_dec_octet:
+ * @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
+rfc3986_parse_dec_octet(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);
+}
+/**
+ * rfc3986_parse_host:
+ * @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
+rfc3986_parse_host(URI *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 (rfc3986_parse_dec_octet(&cur) != 0)
+ goto not_ipv4;
+ if (*cur != '.')
+ goto not_ipv4;
+ cur++;
+ if (rfc3986_parse_dec_octet(&cur) != 0)
+ goto not_ipv4;
+ if (*cur != '.')
+ goto not_ipv4;
+ if (rfc3986_parse_dec_octet(&cur) != 0)
+ goto not_ipv4;
+ if (*cur != '.')
+ goto not_ipv4;
+ if (rfc3986_parse_dec_octet(&cur) != 0)
+ goto not_ipv4;
+ goto found;
+not_ipv4:
+ cur = *str;
+ }
+ /*
+ * then this should be a hostname which can be empty
+ */
+ while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || ISA_SUB_DELIM(cur))
+ NEXT(cur);
+found:
+ if (uri != NULL) {
+ if (uri->authority != NULL) g_free(uri->authority);
+ uri->authority = NULL;
+ if (uri->server != NULL) g_free(uri->server);
+ if (cur != host) {
+ if (uri->cleanup & 2)
+ uri->server = g_strndup(host, cur - host);
+ else
+ uri->server = uri_string_unescape(host, cur - host, NULL);
+ } else
+ uri->server = NULL;
+ }
+ *str = cur;
+ return(0);
+}
+
+/**
+ * rfc3986_parse_authority:
+ * @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
+rfc3986_parse_authority(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+ /*
+ * try to parse an userinfo and check for the trailing @
+ */
+ ret = rfc3986_parse_user_info(uri, &cur);
+ if ((ret != 0) || (*cur != '@'))
+ cur = *str;
+ else
+ cur++;
+ ret = rfc3986_parse_host(uri, &cur);
+ if (ret != 0) return(ret);
+ if (*cur == ':') {
+ cur++;
+ ret = rfc3986_parse_port(uri, &cur);
+ if (ret != 0) return(ret);
+ }
+ *str = cur;
+ return(0);
+}
+
+/**
+ * rfc3986_parse_segment:
+ * @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
+rfc3986_parse_segment(const char **str, char forbid, int empty)
+{
+ const char *cur;
+
+ cur = *str;
+ if (!ISA_PCHAR(cur)) {
+ if (empty)
+ return(0);
+ return(1);
+ }
+ while (ISA_PCHAR(cur) && (*cur != forbid))
+ NEXT(cur);
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_path_ab_empty:
+ * @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
+rfc3986_parse_path_ab_empty(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+
+ while (*cur == '/') {
+ cur++;
+ ret = rfc3986_parse_segment(&cur, 0, 1);
+ if (ret != 0) return(ret);
+ }
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ if (*str != cur) {
+ if (uri->cleanup & 2)
+ uri->path = g_strndup(*str, cur - *str);
+ else
+ uri->path = uri_string_unescape(*str, cur - *str, NULL);
+ } else {
+ uri->path = NULL;
+ }
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_path_absolute:
+ * @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
+rfc3986_parse_path_absolute(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+
+ if (*cur != '/')
+ return(1);
+ cur++;
+ ret = rfc3986_parse_segment(&cur, 0, 0);
+ if (ret == 0) {
+ while (*cur == '/') {
+ cur++;
+ ret = rfc3986_parse_segment(&cur, 0, 1);
+ if (ret != 0) return(ret);
+ }
+ }
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ if (cur != *str) {
+ if (uri->cleanup & 2)
+ uri->path = g_strndup(*str, cur - *str);
+ else
+ uri->path = uri_string_unescape(*str, cur - *str, NULL);
+ } else {
+ uri->path = NULL;
+ }
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_path_rootless:
+ * @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
+rfc3986_parse_path_rootless(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+
+ ret = rfc3986_parse_segment(&cur, 0, 0);
+ if (ret != 0) return(ret);
+ while (*cur == '/') {
+ cur++;
+ ret = rfc3986_parse_segment(&cur, 0, 1);
+ if (ret != 0) return(ret);
+ }
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ if (cur != *str) {
+ if (uri->cleanup & 2)
+ uri->path = g_strndup(*str, cur - *str);
+ else
+ uri->path = uri_string_unescape(*str, cur - *str, NULL);
+ } else {
+ uri->path = NULL;
+ }
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_path_no_scheme:
+ * @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
+rfc3986_parse_path_no_scheme(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+
+ ret = rfc3986_parse_segment(&cur, ':', 0);
+ if (ret != 0) return(ret);
+ while (*cur == '/') {
+ cur++;
+ ret = rfc3986_parse_segment(&cur, 0, 1);
+ if (ret != 0) return(ret);
+ }
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ if (cur != *str) {
+ if (uri->cleanup & 2)
+ uri->path = g_strndup(*str, cur - *str);
+ else
+ uri->path = uri_string_unescape(*str, cur - *str, NULL);
+ } else {
+ uri->path = NULL;
+ }
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_hier_part:
+ * @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
+rfc3986_parse_hier_part(URI *uri, const char **str)
+{
+ const char *cur;
+ int ret;
+
+ cur = *str;
+
+ if ((*cur == '/') && (*(cur + 1) == '/')) {
+ cur += 2;
+ ret = rfc3986_parse_authority(uri, &cur);
+ if (ret != 0) return(ret);
+ ret = rfc3986_parse_path_ab_empty(uri, &cur);
+ if (ret != 0) return(ret);
+ *str = cur;
+ return(0);
+ } else if (*cur == '/') {
+ ret = rfc3986_parse_path_absolute(uri, &cur);
+ if (ret != 0) return(ret);
+ } else if (ISA_PCHAR(cur)) {
+ ret = rfc3986_parse_path_rootless(uri, &cur);
+ if (ret != 0) return(ret);
+ } else {
+ /* path-empty is effectively empty */
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ uri->path = NULL;
+ }
+ }
+ *str = cur;
+ return (0);
+}
+
+/**
+ * rfc3986_parse_relative_ref:
+ * @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
+rfc3986_parse_relative_ref(URI *uri, const char *str) {
+ int ret;
+
+ if ((*str == '/') && (*(str + 1) == '/')) {
+ str += 2;
+ ret = rfc3986_parse_authority(uri, &str);
+ if (ret != 0) return(ret);
+ ret = rfc3986_parse_path_ab_empty(uri, &str);
+ if (ret != 0) return(ret);
+ } else if (*str == '/') {
+ ret = rfc3986_parse_path_absolute(uri, &str);
+ if (ret != 0) return(ret);
+ } else if (ISA_PCHAR(str)) {
+ ret = rfc3986_parse_path_no_scheme(uri, &str);
+ if (ret != 0) return(ret);
+ } else {
+ /* path-empty is effectively empty */
+ if (uri != NULL) {
+ if (uri->path != NULL) g_free(uri->path);
+ uri->path = NULL;
+ }
+ }
+
+ if (*str == '?') {
+ str++;
+ ret = rfc3986_parse_query(uri, &str);
+ if (ret != 0) return(ret);
+ }
+ if (*str == '#') {
+ str++;
+ ret = rfc3986_parse_fragment(uri, &str);
+ if (ret != 0) return(ret);
+ }
+ if (*str != 0) {
+ uri_clean(uri);
+ return(1);
+ }
+ return(0);
+}
+
+
+/**
+ * rfc3986_parse:
+ * @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
+rfc3986_parse(URI *uri, const char *str) {
+ int ret;
+
+ ret = rfc3986_parse_scheme(uri, &str);
+ if (ret != 0) return(ret);
+ if (*str != ':') {
+ return(1);
+ }
+ str++;
+ ret = rfc3986_parse_hier_part(uri, &str);
+ if (ret != 0) return(ret);
+ if (*str == '?') {
+ str++;
+ ret = rfc3986_parse_query(uri, &str);
+ if (ret != 0) return(ret);
+ }
+ if (*str == '#') {
+ str++;
+ ret = rfc3986_parse_fragment(uri, &str);
+ if (ret != 0) return(ret);
+ }
+ if (*str != 0) {
+ uri_clean(uri);
+ return(1);
+ }
+ return(0);
+}
+
+/**
+ * rfc3986_parse_uri_reference:
+ * @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
+rfc3986_parse_uri_reference(URI *uri, const char *str) {
+ int ret;
+
+ if (str == NULL)
+ return(-1);
+ uri_clean(uri);
+
+ /*
+ * Try first to parse absolute refs, then fallback to relative if
+ * it fails.
+ */
+ ret = rfc3986_parse(uri, str);
+ if (ret != 0) {
+ uri_clean(uri);
+ ret = rfc3986_parse_relative_ref(uri, str);
+ if (ret != 0) {
+ uri_clean(uri);
+ return(ret);
+ }
+ }
+ return(0);
+}
+
+/**
+ * uri_parse:
+ * @str: the URI string to analyze
+ *
+ * Parse an URI based on RFC 3986
+ *
+ * URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
+ *
+ * Returns a newly built URI or NULL in case of error
+ */
+URI *
+uri_parse(const char *str) {
+ URI *uri;
+ int ret;
+
+ if (str == NULL)
+ return(NULL);
+ uri = uri_new();
+ if (uri != NULL) {
+ ret = rfc3986_parse_uri_reference(uri, str);
+ if (ret) {
+ uri_free(uri);
+ return(NULL);
+ }
+ }
+ return(uri);
+}
+
+/**
+ * uri_parse_into:
+ * @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
+uri_parse_into(URI *uri, const char *str) {
+ return(rfc3986_parse_uri_reference(uri, str));
+}
+
+/**
+ * uri_parse_raw:
+ * @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 URI or NULL in case of error
+ */
+URI *
+uri_parse_raw(const char *str, int raw) {
+ URI *uri;
+ int ret;
+
+ if (str == NULL)
+ return(NULL);
+ uri = uri_new();
+ if (uri != NULL) {
+ if (raw) {
+ uri->cleanup |= 2;
+ }
+ ret = uri_parse_into(uri, str);
+ if (ret) {
+ uri_free(uri);
+ return(NULL);
+ }
+ }
+ return(uri);
+}
+
+/************************************************************************
+ * *
+ * Generic URI structure functions *
+ * *
+ ************************************************************************/
+
+/**
+ * uri_new:
+ *
+ * Simply creates an empty URI
+ *
+ * Returns the new structure or NULL in case of error
+ */
+URI *
+uri_new(void) {
+ URI *ret;
+
+ ret = (URI *) g_malloc(sizeof(URI));
+ memset(ret, 0, sizeof(URI));
+ return(ret);
+}
+
+/**
+ * realloc2n:
+ *
+ * Function to handle properly a reallocation when saving an URI
+ * Also imposes some limit on the length of an URI string output
+ */
+static char *
+realloc2n(char *ret, int *max) {
+ char *temp;
+ int tmp;
+
+ tmp = *max * 2;
+ temp = g_realloc(ret, (tmp + 1));
+ *max = tmp;
+ return(temp);
+}
+
+/**
+ * uri_to_string:
+ * @uri: pointer to an URI
+ *
+ * Save the URI as an escaped string
+ *
+ * Returns a new string (to be deallocated by caller)
+ */
+char *
+uri_to_string(URI *uri) {
+ char *ret = NULL;
+ char *temp;
+ const char *p;
+ int len;
+ int max;
+
+ if (uri == NULL) return(NULL);
+
+
+ max = 80;
+ ret = g_malloc(max + 1);
+ len = 0;
+
+ if (uri->scheme != NULL) {
+ p = uri->scheme;
+ while (*p != 0) {
+ if (len >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = *p++;
+ }
+ if (len >= max) {
+ temp = realloc2n(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 = realloc2n(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) {
+ if (len + 3 >= max) {
+ temp = realloc2n(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 = realloc2n(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 = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = '@';
+ }
+ p = uri->server;
+ while (*p != 0) {
+ if (len >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = *p++;
+ }
+ if (uri->port > 0) {
+ if (len + 10 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ len += snprintf(&ret[len], max - len, ":%d", uri->port);
+ }
+ } else if (uri->authority != NULL) {
+ if (len + 3 >= max) {
+ temp = realloc2n(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 = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ if ((IS_UNRESERVED(*(p))) ||
+ ((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) ||
+ ((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) ||
+ ((*(p) == '=')) || ((*(p) == '+')))
+ ret[len++] = *p++;
+ else {
+ int val = *(unsigned char *)p++;
+ int hi = val / 0x10, lo = val % 0x10;
+ ret[len++] = '%';
+ ret[len++] = hi + (hi > 9? 'A'-10 : '0');
+ ret[len++] = lo + (lo > 9? 'A'-10 : '0');
+ }
+ }
+ } else if (uri->scheme != NULL) {
+ if (len + 3 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = '/';
+ ret[len++] = '/';
+ }
+ if (uri->path != NULL) {
+ p = uri->path;
+ /*
+ * the colon in file:///d: should not be escaped or
+ * Windows accesses fail later.
+ */
+ if ((uri->scheme != NULL) &&
+ (p[0] == '/') &&
+ (((p[1] >= 'a') && (p[1] <= 'z')) ||
+ ((p[1] >= 'A') && (p[1] <= 'Z'))) &&
+ (p[2] == ':') &&
+ (!strcmp(uri->scheme, "file"))) {
+ if (len + 3 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = *p++;
+ ret[len++] = *p++;
+ ret[len++] = *p++;
+ }
+ while (*p != 0) {
+ if (len + 3 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) ||
+ ((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) ||
+ ((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) ||
+ ((*(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 != NULL) {
+ if (len + 1 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = '?';
+ p = uri->query;
+ while (*p != 0) {
+ if (len + 1 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = *p++;
+ }
+ }
+ }
+ if (uri->fragment != NULL) {
+ if (len + 3 >= max) {
+ temp = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len++] = '#';
+ p = uri->fragment;
+ while (*p != 0) {
+ if (len + 3 >= max) {
+ temp = realloc2n(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 = realloc2n(ret, &max);
+ if (temp == NULL) goto mem_error;
+ ret = temp;
+ }
+ ret[len] = 0;
+ return(ret);
+
+mem_error:
+ g_free(ret);
+ return(NULL);
+}
+
+/**
+ * uri_clean:
+ * @uri: pointer to an URI
+ *
+ * Make sure the URI struct is free of content
+ */
+static void
+uri_clean(URI *uri) {
+ if (uri == NULL) return;
+
+ if (uri->scheme != NULL) g_free(uri->scheme);
+ uri->scheme = NULL;
+ if (uri->server != NULL) g_free(uri->server);
+ uri->server = NULL;
+ if (uri->user != NULL) g_free(uri->user);
+ uri->user = NULL;
+ if (uri->path != NULL) g_free(uri->path);
+ uri->path = NULL;
+ if (uri->fragment != NULL) g_free(uri->fragment);
+ uri->fragment = NULL;
+ if (uri->opaque != NULL) g_free(uri->opaque);
+ uri->opaque = NULL;
+ if (uri->authority != NULL) g_free(uri->authority);
+ uri->authority = NULL;
+ if (uri->query != NULL) g_free(uri->query);
+ uri->query = NULL;
+}
+
+/**
+ * uri_free:
+ * @uri: pointer to an URI
+ *
+ * Free up the URI struct
+ */
+void
+uri_free(URI *uri) {
+ uri_clean(uri);
+ g_free(uri);
+}
+
+/************************************************************************
+ * *
+ * Helper functions *
+ * *
+ ************************************************************************/
+
+/**
+ * normalize_uri_path:
+ * @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
+ */
+static int
+normalize_uri_path(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, *tmp;
+
+ /* 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;
+ }
+ /* Valgrind complained, strcpy(cur, segp + 3); */
+ /* string will overlap, do not use strcpy */
+ tmp = cur;
+ segp += 3;
+ while ((*tmp++ = *segp++) != 0)
+ ;
+
+ /* 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[0] == '/') && (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);
+}
+
+static int is_hex(char c) {
+ if (((c >= '0') && (c <= '9')) ||
+ ((c >= 'a') && (c <= 'f')) ||
+ ((c >= 'A') && (c <= 'F')))
+ return(1);
+ return(0);
+}
+
+
+/**
+ * uri_string_unescape:
+ * @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 *
+uri_string_unescape(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 = g_malloc(len + 1);
+ } else
+ ret = target;
+ in = str;
+ out = ret;
+ while(len > 0) {
+ if ((len > 2) && (*in == '%') && (is_hex(in[1])) && (is_hex(in[2]))) {
+ 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);
+}
+
+/**
+ * uri_string_escape:
+ * @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.
+ */
+char *
+uri_string_escape(const char *str, const char *list) {
+ char *ret, ch;
+ char *temp;
+ const char *in;
+ int len, out;
+
+ if (str == NULL)
+ return(NULL);
+ if (str[0] == 0)
+ return(g_strdup(str));
+ len = strlen(str);
+ if (!(len > 0)) return(NULL);
+
+ len += 20;
+ ret = g_malloc(len);
+ in = str;
+ out = 0;
+ while(*in != 0) {
+ if (len - out <= 3) {
+ temp = realloc2n(ret, &len);
+ ret = temp;
+ }
+
+ ch = *in;
+
+ if ((ch != '@') && (!IS_UNRESERVED(ch)) && (!strchr(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);
+}
+
+/************************************************************************
+ * *
+ * Public functions *
+ * *
+ ************************************************************************/
+
+/**
+ * uri_resolve:
+ * @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.
+ */
+char *
+uri_resolve(const char *uri, const char *base) {
+ char *val = NULL;
+ int ret, len, indx, cur, out;
+ URI *ref = NULL;
+ URI *bas = NULL;
+ URI *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 = uri_new();
+ if (ref == NULL)
+ goto done;
+ ret = uri_parse_into(ref, uri);
+ }
+ else
+ ret = 0;
+ }
+ if (ret != 0)
+ goto done;
+ if ((ref != NULL) && (ref->scheme != NULL)) {
+ /*
+ * The URI is absolute don't modify.
+ */
+ val = g_strdup(uri);
+ goto done;
+ }
+ if (base == NULL)
+ ret = -1;
+ else {
+ bas = uri_new();
+ if (bas == NULL)
+ goto done;
+ ret = uri_parse_into(bas, base);
+ }
+ if (ret != 0) {
+ if (ref)
+ val = uri_to_string(ref);
+ goto done;
+ }
+ if (ref == NULL) {
+ /*
+ * the base fragment must be ignored
+ */
+ if (bas->fragment != NULL) {
+ g_free(bas->fragment);
+ bas->fragment = NULL;
+ }
+ val = uri_to_string(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 = uri_new();
+ if (res == NULL)
+ goto done;
+ if ((ref->scheme == NULL) && (ref->path == NULL) &&
+ ((ref->authority == NULL) && (ref->server == NULL))) {
+ if (bas->scheme != NULL)
+ res->scheme = g_strdup(bas->scheme);
+ if (bas->authority != NULL)
+ res->authority = g_strdup(bas->authority);
+ else if (bas->server != NULL) {
+ res->server = g_strdup(bas->server);
+ if (bas->user != NULL)
+ res->user = g_strdup(bas->user);
+ res->port = bas->port;
+ }
+ if (bas->path != NULL)
+ res->path = g_strdup(bas->path);
+ if (ref->query != NULL)
+ res->query = g_strdup (ref->query);
+ else if (bas->query != NULL)
+ res->query = g_strdup(bas->query);
+ if (ref->fragment != NULL)
+ res->fragment = g_strdup(ref->fragment);
+ 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 = uri_to_string(ref);
+ goto done;
+ }
+ if (bas->scheme != NULL)
+ res->scheme = g_strdup(bas->scheme);
+
+ if (ref->query != NULL)
+ res->query = g_strdup(ref->query);
+ if (ref->fragment != NULL)
+ res->fragment = g_strdup(ref->fragment);
+
+ /*
+ * 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 = g_strdup(ref->authority);
+ else {
+ res->server = g_strdup(ref->server);
+ if (ref->user != NULL)
+ res->user = g_strdup(ref->user);
+ res->port = ref->port;
+ }
+ if (ref->path != NULL)
+ res->path = g_strdup(ref->path);
+ goto step_7;
+ }
+ if (bas->authority != NULL)
+ res->authority = g_strdup(bas->authority);
+ else if (bas->server != NULL) {
+ res->server = g_strdup(bas->server);
+ if (bas->user != NULL)
+ res->user = g_strdup(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 = g_strdup(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 = g_malloc(len);
+ 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
+ */
+ normalize_uri_path(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 = uri_to_string(res);
+
+done:
+ if (ref != NULL)
+ uri_free(ref);
+ if (bas != NULL)
+ uri_free(bas);
+ if (res != NULL)
+ uri_free(res);
+ return(val);
+}
+
+/**
+ * uri_resolve_relative:
+ * @URI: the URI reference under consideration
+ * @base: the base value
+ *
+ * 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
+ * uri_resolve (using 'base') before calling this routine,
+ * since this routine (for reasonable efficiency) assumes URI has
+ * already been through some validation.
+ *
+ * Returns a new URI string (to be freed by the caller) or NULL in case
+ * error.
+ */
+char *
+uri_resolve_relative (const char *uri, const char * base)
+{
+ char *val = NULL;
+ int ret;
+ int ix;
+ int pos = 0;
+ int nbslash = 0;
+ int len;
+ URI *ref = NULL;
+ URI *bas = NULL;
+ char *bptr, *uptr, *vptr;
+ int remove_path = 0;
+
+ if ((uri == NULL) || (*uri == 0))
+ return NULL;
+
+ /*
+ * First parse URI into a standard form
+ */
+ ref = uri_new ();
+ if (ref == NULL)
+ return NULL;
+ /* If URI not already in "relative" form */
+ if (uri[0] != '.') {
+ ret = uri_parse_into (ref, uri);
+ if (ret != 0)
+ goto done; /* Error in URI, return NULL */
+ } else
+ ref->path = g_strdup(uri);
+
+ /*
+ * Next parse base into the same standard form
+ */
+ if ((base == NULL) || (*base == 0)) {
+ val = g_strdup (uri);
+ goto done;
+ }
+ bas = uri_new ();
+ if (bas == NULL)
+ goto done;
+ if (base[0] != '.') {
+ ret = uri_parse_into (bas, base);
+ if (ret != 0)
+ goto done; /* Error in base, return NULL */
+ } else
+ bas->path = g_strdup(base);
+
+ /*
+ * If the scheme / server on the URI differs from the base,
+ * just return the URI
+ */
+ if ((ref->scheme != NULL) &&
+ ((bas->scheme == NULL) ||
+ (strcmp (bas->scheme, ref->scheme)) ||
+ (strcmp (bas->server, ref->server)))) {
+ val = g_strdup (uri);
+ goto done;
+ }
+ if (!strcmp(bas->path, ref->path)) {
+ val = g_strdup("");
+ goto done;
+ }
+ if (bas->path == NULL) {
+ val = g_strdup(ref->path);
+ 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)
+ */
+ if (bas->path == NULL) {
+ if (ref->path != NULL) {
+ uptr = ref->path;
+ if (*uptr == '/')
+ uptr++;
+ /* exception characters from uri_to_string */
+ val = uri_string_escape(uptr, "/;&=+$,");
+ }
+ goto done;
+ }
+ bptr = bas->path;
+ if (ref->path == NULL) {
+ for (ix = 0; bptr[ix] != 0; ix++) {
+ if (bptr[ix] == '/')
+ nbslash++;
+ }
+ uptr = NULL;
+ len = 1; /* this is for a string terminator only */
+ } else {
+ /*
+ * Next we compare the two strings and find where they first differ
+ */
+ if ((ref->path[pos] == '.') && (ref->path[pos+1] == '/'))
+ pos += 2;
+ if ((*bptr == '.') && (bptr[1] == '/'))
+ bptr += 2;
+ else if ((*bptr == '/') && (ref->path[pos] != '/'))
+ bptr++;
+ while ((bptr[pos] == ref->path[pos]) && (bptr[pos] != 0))
+ pos++;
+
+ if (bptr[pos] == ref->path[pos]) {
+ val = g_strdup("");
+ goto done; /* (I can't imagine why anyone would do this) */
+ }
+
+ /*
+ * In URI, "back up" to the last '/' encountered. This will be the
+ * beginning of the "unique" suffix of URI
+ */
+ ix = pos;
+ if ((ref->path[ix] == '/') && (ix > 0))
+ ix--;
+ else if ((ref->path[ix] == 0) && (ix > 1) && (ref->path[ix - 1] == '/'))
+ ix -= 2;
+ for (; ix > 0; ix--) {
+ if (ref->path[ix] == '/')
+ break;
+ }
+ if (ix == 0) {
+ uptr = ref->path;
+ } else {
+ ix++;
+ uptr = &ref->path[ix];
+ }
+
+ /*
+ * In base, count the number of '/' from the differing point
+ */
+ if (bptr[pos] != ref->path[pos]) {/* check for trivial URI == base */
+ for (; bptr[ix] != 0; ix++) {
+ if (bptr[ix] == '/')
+ nbslash++;
+ }
+ }
+ len = strlen (uptr) + 1;
+ }
+
+ if (nbslash == 0) {
+ if (uptr != NULL)
+ /* exception characters from uri_to_string */
+ val = uri_string_escape(uptr, "/;&=+$,");
+ 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 = g_malloc (len + 3 * nbslash);
+ 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 uri_to_string */
+ val = uri_string_escape(vptr, "/;&=+$,");
+ g_free(vptr);
+
+done:
+ /*
+ * Free the working variables
+ */
+ if (remove_path != 0)
+ ref->path = NULL;
+ if (ref != NULL)
+ uri_free (ref);
+ if (bas != NULL)
+ uri_free (bas);
+
+ return val;
+}
+
+/*
+ * Utility functions to help parse and assemble query strings.
+ */
+
+struct QueryParams *
+query_params_new (int init_alloc)
+{
+ struct QueryParams *ps;
+
+ if (init_alloc <= 0) init_alloc = 1;
+
+ ps = g_new(QueryParams, 1);
+ ps->n = 0;
+ ps->alloc = init_alloc;
+ ps->p = g_new(QueryParam, ps->alloc);
+
+ return ps;
+}
+
+/* Ensure there is space to store at least one more parameter
+ * at the end of the set.
+ */
+static int
+query_params_append (struct QueryParams *ps,
+ const char *name, const char *value)
+{
+ if (ps->n >= ps->alloc) {
+ ps->p = g_renew(QueryParam, ps->p, ps->alloc * 2);
+ ps->alloc *= 2;
+ }
+
+ ps->p[ps->n].name = g_strdup(name);
+ ps->p[ps->n].value = value ? g_strdup(value) : NULL;
+ ps->p[ps->n].ignore = 0;
+ ps->n++;
+
+ return 0;
+}
+
+void
+query_params_free (struct QueryParams *ps)
+{
+ int i;
+
+ for (i = 0; i < ps->n; ++i) {
+ g_free (ps->p[i].name);
+ g_free (ps->p[i].value);
+ }
+ g_free (ps->p);
+ g_free (ps);
+}
+
+struct QueryParams *
+query_params_parse (const char *query)
+{
+ struct QueryParams *ps;
+ const char *end, *eq;
+
+ ps = query_params_new (0);
+ if (!query || query[0] == '\0') return ps;
+
+ while (*query) {
+ char *name = NULL, *value = NULL;
+
+ /* Find the next separator, or end of the string. */
+ end = strchr (query, '&');
+ if (!end)
+ end = strchr (query, ';');
+ if (!end)
+ end = query + strlen (query);
+
+ /* Find the first '=' character between here and end. */
+ eq = strchr (query, '=');
+ if (eq && eq >= end) eq = NULL;
+
+ /* Empty section (eg. "&&"). */
+ if (end == query)
+ goto next;
+
+ /* If there is no '=' character, then we have just "name"
+ * and consistent with CGI.pm we assume value is "".
+ */
+ else if (!eq) {
+ name = uri_string_unescape (query, end - query, NULL);
+ value = NULL;
+ }
+ /* Or if we have "name=" here (works around annoying
+ * problem when calling uri_string_unescape with len = 0).
+ */
+ else if (eq+1 == end) {
+ name = uri_string_unescape (query, eq - query, NULL);
+ value = g_new0(char, 1);
+ }
+ /* If the '=' character is at the beginning then we have
+ * "=value" and consistent with CGI.pm we _ignore_ this.
+ */
+ else if (query == eq)
+ goto next;
+
+ /* Otherwise it's "name=value". */
+ else {
+ name = uri_string_unescape (query, eq - query, NULL);
+ value = uri_string_unescape (eq+1, end - (eq+1), NULL);
+ }
+
+ /* Append to the parameter set. */
+ query_params_append (ps, name, value);
+ g_free(name);
+ g_free(value);
+
+ next:
+ query = end;
+ if (*query) query ++; /* skip '&' separator */
+ }
+
+ return ps;
+}
generated by cgit v1.1 at 2024-11-02 19:42:17 +0000