/*

 * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)

 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.

 *

 * 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.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS CONTRIBUTORS 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.

 */

#include "config.h"

#include "HTTPParsers.h"

#include "DeprecatedString.h"

#include "PlatformString.h"

namespace WebCore {

// true if there is more to parse

static inline bool skipWhiteSpace(const String& str, int& pos, bool fromHttpEquivMeta)

{

    int len = str.length();

    if (fromHttpEquivMeta)

        while (pos != len && str[pos] <= ' ')

            ++pos;

    else

        while (pos != len && (str[pos] == '\t' || str[pos] == ' '))

            ++pos;

    return pos != len;

}

bool parseHTTPRefresh(const String& refresh, bool fromHttpEquivMeta, double& delay, String& url)

{

    int len = refresh.length();

    int pos = 0;

    if (!skipWhiteSpace(refresh, pos, fromHttpEquivMeta))

        return false;

    while (pos != len && refresh[pos] != ',' && refresh[pos] != ';')

        ++pos;

    if (pos == len) { // no URL

        url = String();

        bool ok;

        delay = refresh.stripWhiteSpace().toDouble(&ok);

        return ok;

    } else {

        bool ok;

        delay = refresh.left(pos).stripWhiteSpace().toDouble(&ok);

        if (!ok)

            return false;

        ++pos;

        skipWhiteSpace(refresh, pos, fromHttpEquivMeta);

        int urlStartPos = pos;

        if (refresh.find("url", urlStartPos, false) == urlStartPos) {

            urlStartPos += 3;

            skipWhiteSpace(refresh, urlStartPos, fromHttpEquivMeta);

            if (refresh[urlStartPos] == '=') {

                ++urlStartPos;

                skipWhiteSpace(refresh, urlStartPos, fromHttpEquivMeta);

            } else

                urlStartPos = pos;  // e.g. "Refresh: 0; url.html"

        }

        int urlEndPos = len;

        if (refresh[urlStartPos] == '"' || refresh[urlStartPos] == '\'') {

            UChar quotationMark = refresh[urlStartPos];

            urlStartPos++;

            while (urlEndPos > urlStartPos) {

                urlEndPos--;

                if (refresh[urlEndPos] == quotationMark)

                    break;

            }

        }

        url = refresh.substring(urlStartPos, urlEndPos - urlStartPos).stripWhiteSpace();

        return true;

    }

}

String filenameFromHTTPContentDisposition(const String& value)

{

    Vector<String> keyValuePairs = value.split(';');

    unsigned length = keyValuePairs.size();

    for (unsigned i = 0; i < length; i++) {

        int valueStartPos = keyValuePairs[i].find('=');

        if (valueStartPos < 0)

            continue;

        String key = keyValuePairs[i].left(valueStartPos).stripWhiteSpace();

        if (key.isEmpty() || key != "filename")

            continue;

        String value = keyValuePairs[i].substring(valueStartPos + 1).stripWhiteSpace();

        // Remove quotes if there are any

        if (value[0] == '\"')

            value = value.substring(1, value.length() - 2);

        return value;

    }

    return String();

}

String extractMIMETypeFromMediaType(const String& mediaType)

{

    String mimeType;

    unsigned length = mediaType.length();

    for (unsigned offset = 0; offset < length; offset++) {

        UChar c = mediaType[offset];

        if (c == ';')

            break;

        else if (DeprecatedChar(c).isSpace()) // FIXME: This seems wrong, " " is an invalid MIME type character according to RFC 2045.  bug 8644

            continue;

        // FIXME: This is a very slow way to build a string, given WebCore::String's implementation.

        mimeType += String(&c, 1);

    }

    return mimeType;

}

String extractCharsetFromMediaType(const String& mediaType)

{

    int pos = 0;

    int length = (int)mediaType.length();

    while (pos < length) {

        pos = mediaType.find("charset", pos, false);

        if (pos <= 0)

            return String();

        // is what we found a beginning of a word?

        if (mediaType[pos-1] > ' ' && mediaType[pos-1] != ';') {

            pos += 7;

            continue;

        }

        pos += 7;

        // skip whitespace

        while (pos != length && mediaType[pos] <= ' ')

            ++pos;

        if (mediaType[pos++] != '=') // this "charset" substring wasn't a parameter name, but there may be others

            continue;

        while (pos != length && (mediaType[pos] <= ' ' || mediaType[pos] == '"' || mediaType[pos] == '\''))

            ++pos;

        // we don't handle spaces within quoted parameter values, because charset names cannot have any

        int endpos = pos;

        while (pos != length && mediaType[endpos] > ' ' && mediaType[endpos] != '"' && mediaType[endpos] != '\'' && mediaType[endpos] != ';')

            ++endpos;

        return mediaType.substring(pos, endpos-pos);

    }

    return String();

}

}