120 lines
3.1 KiB
Groovy
120 lines
3.1 KiB
Groovy
import java.nio.charset.StandardCharsets
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class MutableByteString {
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private byte[] bytes
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private int length
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MutableByteString(byte... bytes) {
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setInternal(bytes)
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}
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int length() {
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return length
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}
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boolean isEmpty() {
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return length == 0
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}
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byte get(int index) {
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return bytes[check(index)]
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}
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void set(byte[] bytes) {
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setInternal(bytes)
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}
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void set(int index, byte b) {
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bytes[check(index)] = b
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}
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void append(byte b) {
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if (length >= bytes.length) {
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int len = 2 * bytes.length
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if (len < 0) {
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len = Integer.MAX_VALUE
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}
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bytes = Arrays.copyOf(bytes, len)
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}
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bytes[length] = b
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length++
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}
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MutableByteString substring(int from, int to) {
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return new MutableByteString(Arrays.copyOfRange(bytes, from, to))
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}
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void replace(byte[] from, byte[] to) {
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ByteArrayOutputStream copy = new ByteArrayOutputStream()
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if (from.length == 0) {
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for (byte b : bytes) {
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copy.write(to, 0, to.length)
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copy.write(b)
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}
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copy.write(to, 0, to.length)
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} else {
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for (int i = 0; i < length; i++) {
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if (regionEqualsImpl(i, from)) {
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copy.write(to, 0, to.length)
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i += from.length - 1
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} else {
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copy.write(bytes[i])
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}
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}
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}
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set(copy.toByteArray())
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}
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boolean regionEquals(int offset, MutableByteString other, int otherOffset, int len) {
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if (Math.max(offset, otherOffset) + len < 0) {
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return false
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}
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if (offset + len > length || otherOffset + len > other.length()) {
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return false
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}
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for (int i = 0; i < len; i++) {
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if (bytes[offset + i] != other.get(otherOffset + i)) {
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return false
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}
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}
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return true
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}
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String toHexString() {
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char[] hex = new char[2 * length]
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for (int i = 0; i < length; i++) {
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hex[2 * i] = "0123456789abcdef".charAt(bytes[i] >> 4 & 0x0F)
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hex[2 * i + 1] = "0123456789abcdef".charAt(bytes[i] & 0x0F)
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}
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return new String(hex)
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}
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String toStringUtf8() {
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return new String(bytes, 0, length, StandardCharsets.UTF_8)
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}
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private void setInternal(byte[] bytes) {
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this.bytes = bytes.clone()
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this.length = bytes.length
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}
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private boolean regionEqualsImpl(int offset, byte[] other) {
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int len = other.length
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if (offset < 0 || offset + len < 0)
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return false
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if (offset + len > length)
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return false
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for (int i = 0; i < len; i++) {
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if (bytes[offset + i] != other[i])
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return false
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}
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return true
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}
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private int check(int index) {
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if (index < 0 || index >= length)
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throw new IndexOutOfBoundsException(String.valueOf(index))
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return index
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}
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}
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