private int encode0()

in encode/java/src/main/java/com/aliyun/darabonba/encode/Encoder.java [199:246]

• 48 lines of code
• 13 McCabe index (conditional complexity)

        private int encode0(byte[] src, int off, int end, byte[] dst) {
            char[] base64 = isURL ? toBase64URL : toBase64;
            int sp = off;
            int slen = (end - off) / 3 * 3;
            int sl = off + slen;
            if (linemax > 0 && slen  > linemax / 4 * 3)
                slen = linemax / 4 * 3;
            int dp = 0;
            while (sp < sl) {
                int sl0 = Math.min(sp + slen, sl);
                for (int sp0 = sp, dp0 = dp ; sp0 < sl0; ) {
                    int bits = (src[sp0++] & 0xff) << 16 |
                            (src[sp0++] & 0xff) <<  8 |
                            (src[sp0++] & 0xff);
                    dst[dp0++] = (byte)base64[(bits >>> 18) & 0x3f];
                    dst[dp0++] = (byte)base64[(bits >>> 12) & 0x3f];
                    dst[dp0++] = (byte)base64[(bits >>> 6)  & 0x3f];
                    dst[dp0++] = (byte)base64[bits & 0x3f];
                }
                int dlen = (sl0 - sp) / 3 * 4;
                dp += dlen;
                sp = sl0;
                if (dlen == linemax && sp < end) {
                    for (byte b : newline){
                        dst[dp++] = b;
                    }
                }
            }
            if (sp < end) {               // 1 or 2 leftover bytes
                int b0 = src[sp++] & 0xff;
                dst[dp++] = (byte)base64[b0 >> 2];
                if (sp == end) {
                    dst[dp++] = (byte)base64[(b0 << 4) & 0x3f];
                    if (doPadding) {
                        dst[dp++] = '=';
                        dst[dp++] = '=';
                    }
                } else {
                    int b1 = src[sp++] & 0xff;
                    dst[dp++] = (byte)base64[(b0 << 4) & 0x3f | (b1 >> 4)];
                    dst[dp++] = (byte)base64[(b1 << 2) & 0x3f];
                    if (doPadding) {
                        dst[dp++] = '=';
                    }
                }
            }
            return dp;
        }