upload tizen1.0 source

[external/libiri.git] / libiri / parse.c

/*
 * libiri: An IRI/URI/URL parsing library
 * @(#) $Id$
 */

/*
 * Copyright (c) 2005, 2008 Mo McRoberts.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. The names of the author(s) of this software may not be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * AUTHORS OF THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*

The following code was added by Samsung Electronics.

--- a/libiri/parse.c
+++ b/libiri/parse.c
@@ -59,6 +59,7 @@ iri__hexnibble(char c)
        {
                return c - 'a' + 10;
        }
+    return 0;
 }
 
 static inline const char *
@@ -130,6 +131,7 @@ iri__allocbuf(const char *src, size_t *len)
                *len = (src - c) + 1 + sc + ((sc + 1) * (sizeof(char *) + 7));
                *len += (7 * 11);
        }
+    *len = 9999; // FIXME: DIRTY HACK THAT USUALLY WORKS... UNTIL IRI IS NOT TO
        return (char *) calloc(1, *len);
 }



License of the above code is Apache License


    Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.

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*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>

#include "p_libiri.h"

#undef ALIGNMENT
#define ALIGNMENT 8
#undef ALIGN
#define _ALIGN(x) ((((x)+(ALIGNMENT-1))&~(ALIGNMENT-1)))
#define ALIGN(x) (char *) _ALIGN((size_t) x)

static inline int
iri__hexnibble(char c)
{
        if(c >= '0' && c <= '9')
        {
                return c - '0';
        }
        if(c >= 'A' && c <= 'F')
        {
                return c - 'A' + 10;
        }
        if(c >= 'a' && c <= 'f')
        {
                return c - 'a' + 10;
        }
    return 0;
}

static inline const char *
iri__copychar(char **dest, const char *src)
{
        **dest = *src;
        (*dest)++;
        src++;
        return src;
}

/* TODO: Punycode decoding for the host part */
static inline const char *
iri__copychar_decode(char **dest, const char *src, int convert_space)
{
        unsigned char *p = (unsigned char *) (*dest);
        
        if(1 == convert_space && '+' == *src)
        {
                **dest = ' ';
        }
        else if('%' == *src)
        {
                if(0 == isxdigit(src[1]) || 0 == isxdigit(src[2]))
                {
                        /* TODO: Deal with %u<nnnn> non-standard encoding - be liberal in
                         * what you accept, etc.
                         */
                        **dest = '%';
                }
                else
                {
                        *p = (iri__hexnibble(src[1]) << 4) | iri__hexnibble(src[2]);
                        src += 2;
                }
        }
        else
        {
                **dest = *src;
        }
        src++;
        (*dest)++;
        return src;
}

static inline char *
iri__allocbuf(const char *src, size_t *len)
{
        size_t sc;
        const char *p, *c;
/*
        Internal format of IRI structure is very hard to understand at first.
        The buffer is used to store character strings with every parsed part of
        IRI, like host, user, auth, path etc. Start of every character string is
        ALIGNED to ALIGNMENT value and finished with NULL byte.
        Above that, the buffer is used to keep variable size array of parsed
        scheme parts. It consist of the array of addresses pointing to starts
        of scheme parts which are kept as all other characters strings, so are
        aligned to ALIGMENT and ended with NULL byte.
        This function calculates approximation of buffer size to store all the
        data of parser IRI.

        Fully filled buffer with scheme parts looks as follows:
        0. start of the buffer
        1. aligned start of the scheme part with added NULL byte
        2. aligned start of the user part with added NULL byte
        3. aligned start of the password part with added NULL byte
        4. aligned start of the array of size schemes_number+1 of pointers that point
           to consecutive scheme part character strings (last one is NULL)
           schemes_number is a number of scheme tokens delimited with + sign in
           scheme part
        5. schems_number of characters strings of scheme parts each of which
           aligned and finished with NULL byte.
        6. aligned start of the host part with added NULL byte
        7. aligned start of the path part with added NULL byte
        8. aligned start of the query part with added NULL byte
        9. aligned start of the anchor part with added NULL byte

        There can be indentified 4 kinds of characters in IRI:
        - characters which are copied one to one (i.e. letters)
        - characters which are removed (special characters like comma in scheme)
        - characters which are replaced with other characers where buffer grows
          this only happens with scheme part
        - characters which are replaced with other characers where buffer decreases

        Alighning a pointer in worst case will advance a buffer pointers
        ALIGNMENT-1 bytes

        Knowing all that we can count an approximation of buffer size which can
        be trusted that whole parsed IRI content will fit in.
*/

/* first approximation - all characers will have to be stored in buffer */
        *len = strlen(src);

/* second approximation - IRI has all possible parts which have to be
 * aligned to ALIGNMENT and have NULL byte an the end. There are 7 different
 * parts like that */
        *len += 7 * (ALIGNMENT-1 + 1);

/* third approximation - we have to make a room for scheme parts array.
 * Because the array has an aligned array of n + 1 pointers and n
 * characters strings aligned and NULL byte terminated.
 */
    if(NULL != (c = strchr(src, ':')))
    {
        sc = 1;
        for(p = src; p < c; p++)
        {
            if(*p == '+')
            {
                sc++;
            }
        }
                /* fourth approximation - all characters of scheme part will be stored
                 * in scheme parts tokens */
                *len += (c - src);

                /* fifth approximation - Ensure we can align each element on an
                 * ALIGNMENT byte boundary and append NULL byte */
                *len += sc * (ALIGNMENT-1 + 1);

                /* sixth approximation - Ensure we have a room for aligned array
                 * indexes */
                *len += ALIGNMENT-1 + (sc + 1) * (sizeof(char*)/sizeof(char));
    }
        return (char *) calloc(1, *len);
}

iri_t *
iri_parse(const char *src)
{
        iri_t *p;
        char *bufstart, *endp, *bufp, **sl;
        const char *at, *colon, *slash, *t;
        size_t buflen, sc, cp;
        
        if(NULL == (p = (iri_t *) calloc(1, sizeof(iri_t))))
        {
                return NULL;
        }
        if(NULL == (bufstart = iri__allocbuf(src, &buflen)))
        {
                free(p);
                return NULL;
        }
        p->base = bufp = bufstart;
        p->nbytes = buflen;
        at = strchr(src, '@');
        slash = strchr(src, '/');
        colon = strchr(src, ':');
        if(slash && colon && slash < colon)
        {
                /* We can disregard the colon if a slash appears before it */
                colon = NULL;
        }
        if(colon && !at)
        {
                /* Definitely a scheme */
                bufp = ALIGN(bufp);
                p->iri.scheme = bufp;
                while(*src && *src != ':')
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
                src++;
                /* src[0-1] SHOULD == '/' */
                if(src[0] == '/') src++;
                if(src[0] == '/') src++;
        }
        else if(colon && at && colon < at)
        {
                fprintf(stderr, "Colon occurs before at\n");
                /* This could be scheme://user[;auth][:password]@host or [scheme:]user[;auth][:password]@host (urgh) */
                if(colon[1] == '/' && colon[2] == '/' && colon[3] != '/')
                {
                        bufp = ALIGN(bufp);
                        p->iri.scheme = bufp;
                        while(*src && *src != ':')
                        {
                                src = iri__copychar_decode(&bufp, src, 0);
                        }
                        *bufp = 0;
                        bufp++;
                        src++;
                        /* src[0-1] SHOULD == '/' */
                        for(; *src == '/'; src++);
                        bufp = ALIGN(bufp);
                        p->iri.user = bufp;
                        fprintf(stderr, "Found user\n");
                }
                else
                {
                        fprintf(stderr, "Matched scheme\n");
                        bufp = ALIGN(bufp);
                        p->iri.scheme = bufp;
                }
                while(*src && *src != ':' && *src != '@' && *src != ';')
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
                if(*src == ';')
                {
                        /* Following authentication parameters */
                        src++;
                        bufp = ALIGN(bufp);
                        p->iri.auth = bufp;
                        while(*src && *src != ':' && *src != '@')
                        {
                                /* Don't decode, so it can be extracted properly */
                                src = iri__copychar(&bufp, src);
                        }
                        *bufp = 0;
                        bufp++;
                }
                if(*src == ':')
                {
                        /* Following password data */
                        src++;
                        bufp = ALIGN(bufp);
                        p->iri.password = bufp;
                        while(*src && *src != ':' && *src != '@')
                        {
                                src = iri__copychar_decode(&bufp, src, 0);
                        }
                        *bufp = 0;
                        bufp++;
                        if(*src == ':')
                        {
                                src++;
                                /* It was actually scheme:user:auth@host */
                                p->iri.user = p->iri.auth;
                                bufp = ALIGN(bufp);
                                p->iri.password = bufp;
                                while(*src && *src != '@')
                                {
                                        src = iri__copychar_decode(&bufp, src, 0);
                                }
                                *bufp = 0;
                                bufp++;
                        }
                }
                if(!*src)
                {
                        /* No host part */
                        return p;
                }
                if(*src == '@')
                {
                        src++;
                }
        }
        else if(at)
        {
                /* user[;auth]@host[/path...] */
                bufp = ALIGN(bufp);
                p->iri.user = bufp;
                while(*src != '@' && *src != ';')
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
                if(*src == ';')
                {
                        src++;
                        bufp = ALIGN(bufp);
                        p->iri.auth = bufp;
                        while(*src && *src != '@')
                        {
                                /* Don't decode, so it can be extracted properly */
                                src = iri__copychar(&bufp, src);
                        }
                        *bufp = 0;
                        bufp++;
                }
                else
                {
                        src++;
                }
        }
        if(NULL != p->iri.scheme)
        {
                sc = 1;
                for(t = p->iri.scheme; *t; t++)
                {
                        if('+' == *t)
                        {
                                sc++;
                        }
                }
                bufp = ALIGN(bufp);
                sl = (char **) (void *) bufp;
                bufp += (sc + 1) * sizeof(char *);
                sc = 0;
                cp = 0;
                bufp = ALIGN(bufp);
                sl[0] = bufp;
                for(t = p->iri.scheme; *t; t++)
                {
                        if('+' == *t)
                        {
                                if(sl[sc][0])
                                {
                                        sl[sc][cp] = 0;
                                        bufp++;
                                        sc++;
                                        bufp = ALIGN(bufp);
                                        sl[sc] = bufp;
                                        cp = 0;
                                }
                        }
                        else
                        {
                                sl[sc][cp] = *t;
                                bufp++;
                                cp++;
                        }
                }
                if(sl[sc][0])
                {
                        sl[sc][cp] = 0;
                        sc++;
                        bufp++;
                }
                sl[sc] = NULL;
                p->iri.schemelist = (const char **) sl;
                p->iri.nschemes = sc;
                bufp++;
        }
        bufp = ALIGN(bufp);
        p->iri.host = bufp;
        while(*src && *src != ':' && *src != '/' && *src != '?' && *src != '#')
        {
                src = iri__copychar_decode(&bufp, src, 0);
        }
        *bufp = 0;
        bufp++;
        if(*src == ':')
        {
                /* Port part */
                src++;
                endp = (char *) src;
                p->iri.port = strtol(src, &endp, 10);
                src = endp;
        }
        if(*src == '/')
        {
                bufp = ALIGN(bufp);
                p->iri.path = bufp;
                while(*src && *src != '?' && *src != '#')
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
        }
        if(*src == '?')
        {
                bufp = ALIGN(bufp);
                p->iri.query = bufp;
                src++;
                while(*src && *src != '#')
                {
                        /* Don't actually decode the query itself, otherwise it
                         * can't be reliably split */
                        src = iri__copychar(&bufp, src);
                }
                *bufp = 0;
                bufp++;
        }
        if(*src == '#')
        {
                bufp = ALIGN(bufp);
                p->iri.anchor = bufp; 
                while(*src)
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
        }
        if(*src)
        {
                /* Still stuff left? It must be a path... of sorts */
                bufp = ALIGN(bufp);
                p->iri.path = bufp; 
                while(*src && *src != '?' && *src != '#')
                {
                        src = iri__copychar_decode(&bufp, src, 0);
                }
                *bufp = 0;
                bufp++;
        }
        return p;
}