libwbxml/include/wbxml_encoder.h

/*
 * Copyright (C) 2007 Esmertec AG.
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef WBXML_ENCODER_H
#define WBXML_ENCODER_H

#include <stdint.h>
#include "wbxml_const.h"
#include "wbxml_stl.h"


class WbxmlHandler
{
public:
    virtual ~WbxmlHandler() {}
    virtual void wbxmlData(const char *data, uint32_t len) = 0;
};

enum EncoderError {
    NO_ERROR = 0,
    ERROR_NO_PUBLIC_ID = 1,
    ERROR_UNSUPPORTED_DOCTYPE,
    ERROR_UNSUPPORTED_TAG,
    ERROR_UNSUPPORTED_ATTR,
    ERROR_INVALID_DATA,
    ERROR_INVALID_INTEGER_VALUE,
    ERROR_INVALID_DATETIME_VALUE,
    ERROR_INVALID_END_ELEMENT,
};

class WbxmlEncoder
{
public:
    WbxmlEncoder(int publicId):mPublicId(publicId) {}

    virtual ~WbxmlEncoder() {}

    void setWbxmlHandler(WbxmlHandler * handler)
    {
        mHandler = handler;
    }

    virtual EncoderError startElement(const char *name, const char **atts) = 0;
    virtual EncoderError characters(const char *chars, int len) = 0;
    virtual EncoderError endElement() = 0;

    /**
     * Reset the encoder so that it may be used again. The WbxmlHandler is
     * NOT cleared by reset().
     */
    virtual void reset() = 0;

    static bool isXmlWhitespace(int ch);
    static bool parseUint(const char * s, int len, uint32_t *res);

protected:
    WbxmlHandler * mHandler;
    int mPublicId;

    EncoderError encodeInteger(const char *chars, int len);
    EncoderError encodeDatetime(const char *chars, int len);
    void encodeInlinedStr(const char *s, int len);
    void encodeMbuint(uint32_t i);

    void clearResult()
    {
        mResult.clear();
    }

    void appendResult(int ch)
    {
        mResult += (char)ch;
    }

    void appendResult(const char *s, int len)
    {
        mResult.append(s, len);
    }

    void sendResult();

    /**
     * Append a string into the string table, return the index of the string in
     * the string table.
     */
    int appendToStringTable(const char *s);

private:
    string mResult;
    vector<string> mStringTable;
};

#endif