charchunk.java

业界著名的tomcat服务器的最新6.0的源代码。

	int sOff = off;
	int sEnd = off + len;
	while (sOff < sEnd) {
	    int d = min(limit - end, sEnd - sOff);
	    s.getChars( sOff, sOff+d, buff, end);
	    sOff += d;
	    end += d;
	    if (end >= limit)
		flushBuffer();
	}
    }
    
    // -------------------- Removing data from the buffer --------------------

    public int substract()
        throws IOException {

        if ((end - start) == 0) {
            if (in == null)
                return -1;
            int n = in.realReadChars(buff, end, buff.length - end);
            if (n < 0)
                return -1;
        }

        return (buff[start++]);

    }

    public int substract(CharChunk src)
        throws IOException {

        if ((end - start) == 0) {
            if (in == null)
                return -1;
            int n = in.realReadChars( buff, end, buff.length - end);
            if (n < 0)
                return -1;
        }

        int len = getLength();
        src.append(buff, start, len);
        start = end;
        return len;

    }

    public int substract( char src[], int off, int len )
        throws IOException {

        if ((end - start) == 0) {
            if (in == null)
                return -1;
            int n = in.realReadChars( buff, end, buff.length - end);
            if (n < 0)
                return -1;
        }

        int n = len;
        if (len > getLength()) {
            n = getLength();
        }
        System.arraycopy(buff, start, src, off, n);
        start += n;
        return n;

    }


    public void flushBuffer()
	throws IOException
    {
	//assert out!=null
	if( out==null ) {
	    throw new IOException( "Buffer overflow, no sink " + limit + " " +
				   buff.length  );
	}
	out.realWriteChars( buff, start, end - start );
	end=start;
    }

    /** Make space for len chars. If len is small, allocate
     *	a reserve space too. Never grow bigger than limit.
     */
    private void makeSpace(int count)
    {
	char[] tmp = null;

	int newSize;
	int desiredSize=end + count;

	// Can't grow above the limit
	if( limit > 0 &&
	    desiredSize > limit) {
	    desiredSize=limit;
	}

	if( buff==null ) {
	    if( desiredSize < 256 ) desiredSize=256; // take a minimum
	    buff=new char[desiredSize];
	}

	// limit < buf.length ( the buffer is already big )
	// or we already have space XXX
	if( desiredSize <= buff.length) {
	    return;
	}
	// grow in larger chunks
	if( desiredSize < 2 * buff.length ) {
	    newSize= buff.length * 2;
	    if( limit >0 &&
		newSize > limit ) newSize=limit;
	    tmp=new char[newSize];
	} else {
	    newSize= buff.length * 2 + count ;
	    if( limit > 0 &&
		newSize > limit ) newSize=limit;
	    tmp=new char[newSize];
	}
	
	System.arraycopy(buff, start, tmp, start, end-start);
	buff = tmp;
	tmp = null;
    }
    
    // -------------------- Conversion and getters --------------------

    public String toString() {
        if (null == buff) {
            return null;
        } else if (end-start == 0) {
            return "";
        }
        return StringCache.toString(this);
    }
    
    public String toStringInternal() {
        return new String(buff, start, end-start);
    }

    public int getInt()
    {
	return Ascii.parseInt(buff, start,
				end-start);
    }
    
    // -------------------- equals --------------------

    /**
     * Compares the message bytes to the specified String object.
     * @param s the String to compare
     * @return true if the comparison succeeded, false otherwise
     */
    public boolean equals(String s) {
	char[] c = buff;
	int len = end-start;
	if (c == null || len != s.length()) {
	    return false;
	}
	int off = start;
	for (int i = 0; i < len; i++) {
	    if (c[off++] != s.charAt(i)) {
		return false;
	    }
	}
	return true;
    }

    /**
     * Compares the message bytes to the specified String object.
     * @param s the String to compare
     * @return true if the comparison succeeded, false otherwise
     */
    public boolean equalsIgnoreCase(String s) {
	char[] c = buff;
	int len = end-start;
	if (c == null || len != s.length()) {
	    return false;
	}
	int off = start;
	for (int i = 0; i < len; i++) {
	    if (Ascii.toLower( c[off++] ) != Ascii.toLower( s.charAt(i))) {
		return false;
	    }
	}
	return true;
    }

    public boolean equals(CharChunk cc) {
	return equals( cc.getChars(), cc.getOffset(), cc.getLength());
    }

    public boolean equals(char b2[], int off2, int len2) {
	char b1[]=buff;
	if( b1==null && b2==null ) return true;
	
	if (b1== null || b2==null || end-start != len2) {
	    return false;
	}
	int off1 = start;
	int len=end-start;
	while ( len-- > 0) {
	    if (b1[off1++] != b2[off2++]) {
		return false;
	    }
	}
	return true;
    }

    public boolean equals(byte b2[], int off2, int len2) {
	char b1[]=buff;
	if( b2==null && b1==null ) return true;

	if (b1== null || b2==null || end-start != len2) {
	    return false;
	}
	int off1 = start;
	int len=end-start;
	
	while ( len-- > 0) {
	    if ( b1[off1++] != (char)b2[off2++]) {
		return false;
	    }
	}
	return true;
    }
    
    /**
     * Returns true if the message bytes starts with the specified string.
     * @param s the string
     */
    public boolean startsWith(String s) {
	char[] c = buff;
	int len = s.length();
	if (c == null || len > end-start) {
	    return false;
	}
	int off = start;
	for (int i = 0; i < len; i++) {
	    if (c[off++] != s.charAt(i)) {
		return false;
	    }
	}
	return true;
    }
    
    /**
     * Returns true if the message bytes starts with the specified string.
     * @param s the string
     */
    public boolean startsWithIgnoreCase(String s, int pos) {
	char[] c = buff;
	int len = s.length();
	if (c == null || len+pos > end-start) {
	    return false;
	}
	int off = start+pos;
	for (int i = 0; i < len; i++) {
	    if (Ascii.toLower( c[off++] ) != Ascii.toLower( s.charAt(i))) {
		return false;
	    }
	}
	return true;
    }
    

    // -------------------- Hash code  --------------------

    // normal hash. 
    public int hash() {
	int code=0;
	for (int i = start; i < start + end-start; i++) {
	    code = code * 37 + buff[i];
	}
	return code;
    }

    // hash ignoring case
    public int hashIgnoreCase() {
	int code=0;
	for (int i = start; i < end; i++) {
	    code = code * 37 + Ascii.toLower(buff[i]);
	}
	return code;
    }

    public int indexOf(char c) {
	return indexOf( c, start);
    }
    
    /**
     * Returns true if the message bytes starts with the specified string.
     * @param c the character
     */
    public int indexOf(char c, int starting) {
	int ret = indexOf( buff, start+starting, end, c );
	return (ret >= start) ? ret - start : -1;
    }

    public static int indexOf( char chars[], int off, int cend, char qq )
    {
	while( off < cend ) {
	    char b=chars[off];
	    if( b==qq )
		return off;
	    off++;
	}
	return -1;
    }
    

    public int indexOf( String src, int srcOff, int srcLen, int myOff ) {
	char first=src.charAt( srcOff );

	// Look for first char 
	int srcEnd = srcOff + srcLen;
        
	for( int i=myOff+start; i <= (end - srcLen); i++ ) {
	    if( buff[i] != first ) continue;
	    // found first char, now look for a match
            int myPos=i+1;
	    for( int srcPos=srcOff + 1; srcPos< srcEnd; ) {
                if( buff[myPos++] != src.charAt( srcPos++ ))
		    break;
                if( srcPos==srcEnd ) return i-start; // found it
	    }
	}
	return -1;
    }

    // -------------------- utils
    private int min(int a, int b) {
	if (a < b) return a;
	return b;
    }

    // Char sequence impl
    
    public char charAt(int index) {
        return buff[index + start];
    }
    
    public CharSequence subSequence(int start, int end) {
        try {
            CharChunk result = (CharChunk) this.clone();
            result.setOffset(this.start + start);
            result.setEnd(this.start + end);
            return result;
        } catch (CloneNotSupportedException e) {
            // Cannot happen
            return null;
        }
    }
    
    public int length() {
        return end - start;
    }
    
}