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Add utf8BytesWithUtf16LengthToString method to Utf8Utils

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This commit is contained in:
Ben Gruver
2012-10-21 21:17:23 -07:00
parent 09e6d003cb
commit e593a563ae
1 changed files with 84 additions and 0 deletions
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84
util/src/main/java/org/jf/util/Utf8Utils.java
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@ -141,6 +141,90 @@ public final class Utf8Utils {
if ((v2 & 0xc0) != 0x80) {
return throwBadUtf8(v2, at + 2);
}
int value = ((v0 & 0x0f) << 12) | ((v1 & 0x3f) << 6) |
(v2 & 0x3f);
if (value < 0x800) {
/*
* This should have been represented with one- or
* two-byte encoding.
*/
return throwBadUtf8(v2, at + 2);
}
out = (char) value;
at += 3;
break;
}
default: {
// 10XXXXXX, 1111XXXX -- illegal
return throwBadUtf8(v0, at);
}
}
chars[outAt] = out;
outAt++;
}
return new String(chars, 0, outAt);
}
/**
* Converts an array of UTF-8 bytes into a string.
*
* @param bytes non-null; the bytes to convert
* @param start the start index of the utf8 string to convert
* @param utf16Length the number of utf16 characters in the string to decode
* @return non-null; the converted string
*/
public static String utf8BytesWithUtf16LengthToString(byte[] bytes, int start, int utf16Length) {
char[] chars = localBuffer.get();
if (chars == null || chars.length < utf16Length) {
chars = new char[utf16Length];
localBuffer.set(chars);
}
int outAt = 0;
for (int at = start; utf16Length > 0; utf16Length--) {
int v0 = bytes[at] & 0xFF;
char out;
switch (v0 >> 4) {
case 0x00: case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06: case 0x07: {
// 0XXXXXXX -- single-byte encoding
if (v0 == 0) {
// A single zero byte is illegal.
return throwBadUtf8(v0, at);
}
out = (char) v0;
at++;
break;
}
case 0x0c: case 0x0d: {
// 110XXXXX -- two-byte encoding
int v1 = bytes[at + 1] & 0xFF;
if ((v1 & 0xc0) != 0x80) {
return throwBadUtf8(v1, at + 1);
}
int value = ((v0 & 0x1f) << 6) | (v1 & 0x3f);
if ((value != 0) && (value < 0x80)) {
/*
* This should have been represented with
* one-byte encoding.
*/
return throwBadUtf8(v1, at + 1);
}
out = (char) value;
at += 2;
break;
}
case 0x0e: {
// 1110XXXX -- three-byte encoding
int v1 = bytes[at + 1] & 0xFF;
if ((v1 & 0xc0) != 0x80) {
return throwBadUtf8(v1, at + 1);
}
int v2 = bytes[at + 2] & 0xFF;
if ((v2 & 0xc0) != 0x80) {
return throwBadUtf8(v2, at + 2);
}
int value = ((v0 & 0x0f) << 12) | ((v1 & 0x3f) << 6) |
(v2 & 0x3f);
if (value < 0x800) {