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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) {