mirror of
https://github.com/corda/corda.git
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87b02eb949
Previously, I used a shell script to extract modification date ranges from the Git history, but that was complicated and unreliable, so now every file just gets the same year range in its copyright header. If someone needs to know when a specific file was modified and by whom, they can look at the Git history themselves; no need to include it redundantly in the header.
119 lines
3.5 KiB
Java
119 lines
3.5 KiB
Java
/* Copyright (c) 2008-2013, Avian Contributors
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Permission to use, copy, modify, and/or distribute this software
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for any purpose with or without fee is hereby granted, provided
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that the above copyright notice and this permission notice appear
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in all copies.
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There is NO WARRANTY for this software. See license.txt for
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details. */
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package avian;
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import java.io.ByteArrayOutputStream;
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public class Utf8 {
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public static boolean test(Object data) {
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if (!(data instanceof byte[])) return false;
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byte[] b = (byte[])data;
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for (int i = 0; i < b.length; ++i) {
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if (((int)b[i] & 0x080) != 0) return true;
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}
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return false;
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}
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public static byte[] encode(char[] s16, int offset, int length) {
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ByteArrayOutputStream buf = new ByteArrayOutputStream();
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for (int i = offset; i < offset+length; ++i) {
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char c = s16[i];
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if (c == '\u0000') { // null char
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buf.write(0);
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buf.write(0);
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} else if (c < 0x080) { // 1 byte char
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buf.write(c);
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} else if (c < 0x0800) { // 2 byte char
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buf.write(0x0c0 | (c >>> 6));
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buf.write(0x080 | (c & 0x03f));
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} else { // 3 byte char
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buf.write(0x0e0 | ((c >>> 12) & 0x0f));
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buf.write(0x080 | ((c >>> 6) & 0x03f));
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buf.write(0x080 | (c & 0x03f));
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}
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}
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return buf.toByteArray();
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}
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public static Object decode(byte[] s8, int offset, int length) {
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Object buf = new byte[length];
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boolean isMultiByte = false;
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int i=offset, j=0;
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while (i < offset+length) {
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int x = s8[i++];
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if ((x & 0x080) == 0x0) { // 1 byte char
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if (x == 0) { // 2 byte null char
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if (i == offset + length) {
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return null;
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}
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++ i;
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}
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cram(buf, j++, x);
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} else if ((x & 0x0e0) == 0x0c0) { // 2 byte char
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if (i == offset + length) {
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return null;
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}
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if (!isMultiByte) {
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buf = widen(buf, j, length-1);
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isMultiByte = true;
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}
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int y = s8[i++];
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cram(buf, j++, ((x & 0x1f) << 6) | (y & 0x3f));
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} else if ((x & 0x0f0) == 0x0e0) { // 3 byte char
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if (i + 1 >= offset + length) {
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return null;
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}
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if (!isMultiByte) {
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buf = widen(buf, j, length-2);
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isMultiByte = true;
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}
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int y = s8[i++]; int z = s8[i++];
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cram(buf, j++, ((x & 0xf) << 12) | ((y & 0x3f) << 6) | (z & 0x3f));
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}
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}
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return trim(buf, j);
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}
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public static char[] decode16(byte[] s8, int offset, int length) {
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Object decoded = decode(s8, offset, length);
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if (decoded == null) {
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return null;
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} else if (decoded instanceof char[]) {
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return (char[])decoded;
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} else {
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return (char[])widen(decoded, length, length);
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}
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}
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private static void cram(Object data, int index, int val) {
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if (data instanceof byte[]) ((byte[])data)[index] = (byte)val;
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else ((char[])data)[index] = (char)val;
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}
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private static Object widen(Object data, int length, int capacity) {
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byte[] src = (byte[])data;
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char[] result = new char[capacity];
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for (int i = 0; i < length; ++i) result[i] = (char)((int)src[i] & 0x0ff);
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return result;
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}
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private static Object trim(Object data, int length) {
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if (data instanceof byte[]) return data;
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if (((char[])data).length == length) return data;
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char[] result = new char[length];
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System.arraycopy(data, 0, result, 0, length);
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return result;
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}
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}
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