httpcore5/src/main/java/org/apache/hc/core5/util/CharArrayBuffer.java [77:94]:
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    public void append(final char[] b, final int off, final int len) {
        if (b == null) {
            return;
        }
        if (off < 0 || off > b.length || len < 0 ||
                (off + len) < 0 || (off + len) > b.length) {
            throw new IndexOutOfBoundsException("off: " + off + " len: " + len + " b.length: " + b.length);
        }
        if (len == 0) {
            return;
        }
        final int newlen = this.len + len;
        if (newlen > this.array.length) {
            expand(newlen);
        }
        System.arraycopy(b, off, this.array, this.len, len);
        this.len = newlen;
    }
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httpcore5/src/main/java/org/apache/hc/core5/util/ByteArrayBuffer.java [75:92]:
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    public void append(final byte[] b, final int off, final int len) {
        if (b == null) {
            return;
        }
        if (off < 0 || off > b.length || len < 0 ||
                (off + len) < 0 || (off + len) > b.length) {
            throw new IndexOutOfBoundsException("off: " + off + " len: " + len + " b.length: " + b.length);
        }
        if (len == 0) {
            return;
        }
        final int newlen = this.len + len;
        if (newlen > this.array.length) {
            expand(newlen);
        }
        System.arraycopy(b, off, this.array, this.len, len);
        this.len = newlen;
    }
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