public int indexOf()

in core/src/main/java/org/apache/james/mime4j/io/BufferedLineReaderInputStream.java [261:303]

• 39 lines of code
• 11 McCabe index (conditional complexity)

    public int indexOf(final byte[] pattern, int off, int len) {
        if (pattern == null) {
            throw new IllegalArgumentException("Pattern may not be null");
        }
        if (off < this.bufpos || len < 0 || off + len > this.buflen) {
            throw new IndexOutOfBoundsException("looking for "+off+"("+len+")"+" in "+bufpos+"/"+buflen);
        }
        if (len < pattern.length) {
            return -1;
        }


        for (int i = 0; i < shiftTable.length; i++) {
            shiftTable[i] = pattern.length + 1;
        }
        for (int i = 0; i < pattern.length; i++) {
            int x = pattern[i] & 0xff;
            shiftTable[x] = pattern.length - i;
        }

        int j = 0;
        while (j <= len - pattern.length) {
            int cur = off + j;
            boolean match = true;
            for (int i = 0; i < pattern.length; i++) {
                if (this.buffer[cur + i] != pattern[i]) {
                    match = false;
                    break;
                }
            }
            if (match) {
                return cur;
            }

            int pos = cur + pattern.length;
            if (pos >= this.buffer.length) {
                break;
            }
            int x = this.buffer[pos] & 0xff;
            j += shiftTable[x];
        }
        return -1;
    }