JDK 11 java.base.jmod - Base Module
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⏎ java/lang/StringCoding.java
/*
* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*
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*/
package java.lang;
import java.io.UnsupportedEncodingException;
import java.lang.ref.SoftReference;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.MalformedInputException;
import java.nio.charset.UnmappableCharacterException;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Arrays;
import jdk.internal.HotSpotIntrinsicCandidate;
import sun.nio.cs.HistoricallyNamedCharset;
import sun.nio.cs.ArrayDecoder;
import sun.nio.cs.ArrayEncoder;
import static java.lang.String.LATIN1;
import static java.lang.String.UTF16;
import static java.lang.String.COMPACT_STRINGS;
import static java.lang.Character.isSurrogate;
import static java.lang.Character.highSurrogate;
import static java.lang.Character.lowSurrogate;
import static java.lang.Character.isSupplementaryCodePoint;
import static java.lang.StringUTF16.putChar;
/**
* Utility class for string encoding and decoding.
*/
class StringCoding {
private StringCoding() { }
/** The cached coders for each thread */
private static final ThreadLocal<SoftReference<StringDecoder>> decoder =
new ThreadLocal<>();
private static final ThreadLocal<SoftReference<StringEncoder>> encoder =
new ThreadLocal<>();
private static final Charset ISO_8859_1 = sun.nio.cs.ISO_8859_1.INSTANCE;
private static final Charset US_ASCII = sun.nio.cs.US_ASCII.INSTANCE;
private static final Charset UTF_8 = sun.nio.cs.UTF_8.INSTANCE;
private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
SoftReference<T> sr = tl.get();
if (sr == null)
return null;
return sr.get();
}
private static <T> void set(ThreadLocal<SoftReference<T>> tl, T ob) {
tl.set(new SoftReference<>(ob));
}
// Trim the given byte array to the given length
private static byte[] safeTrim(byte[] ba, int len, boolean isTrusted) {
if (len == ba.length && (isTrusted || System.getSecurityManager() == null))
return ba;
else
return Arrays.copyOf(ba, len);
}
private static int scale(int len, float expansionFactor) {
// We need to perform double, not float, arithmetic; otherwise
// we lose low order bits when len is larger than 2**24.
return (int)(len * (double)expansionFactor);
}
private static Charset lookupCharset(String csn) {
if (Charset.isSupported(csn)) {
try {
return Charset.forName(csn);
} catch (UnsupportedCharsetException x) {
throw new Error(x);
}
}
return null;
}
static class Result {
byte[] value;
byte coder;
Result with() {
coder = COMPACT_STRINGS ? LATIN1 : UTF16;
value = new byte[0];
return this;
}
Result with(char[] val, int off, int len) {
if (String.COMPACT_STRINGS) {
byte[] bs = StringUTF16.compress(val, off, len);
if (bs != null) {
value = bs;
coder = LATIN1;
return this;
}
}
coder = UTF16;
value = StringUTF16.toBytes(val, off, len);
return this;
}
Result with(byte[] val, byte coder) {
this.coder = coder;
value = val;
return this;
}
}
@HotSpotIntrinsicCandidate
public static boolean hasNegatives(byte[] ba, int off, int len) {
for (int i = off; i < off + len; i++) {
if (ba[i] < 0) {
return true;
}
}
return false;
}
// -- Decoding --
static class StringDecoder {
private final String requestedCharsetName;
private final Charset cs;
private final boolean isASCIICompatible;
private final CharsetDecoder cd;
protected final Result result;
StringDecoder(Charset cs, String rcn) {
this.requestedCharsetName = rcn;
this.cs = cs;
this.cd = cs.newDecoder()
.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE);
this.result = new Result();
this.isASCIICompatible = (cd instanceof ArrayDecoder) &&
((ArrayDecoder)cd).isASCIICompatible();
}
String charsetName() {
if (cs instanceof HistoricallyNamedCharset)
return ((HistoricallyNamedCharset)cs).historicalName();
return cs.name();
}
final String requestedCharsetName() {
return requestedCharsetName;
}
Result decode(byte[] ba, int off, int len) {
if (len == 0) {
return result.with();
}
// fastpath for ascii compatible
if (isASCIICompatible && !hasNegatives(ba, off, len)) {
if (COMPACT_STRINGS) {
return result.with(Arrays.copyOfRange(ba, off, off + len),
LATIN1);
} else {
return result.with(StringLatin1.inflate(ba, off, len), UTF16);
}
}
int en = scale(len, cd.maxCharsPerByte());
char[] ca = new char[en];
if (cd instanceof ArrayDecoder) {
int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
return result.with(ca, 0, clen);
}
cd.reset();
ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
CharBuffer cb = CharBuffer.wrap(ca);
try {
CoderResult cr = cd.decode(bb, cb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = cd.flush(cb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
// Substitution is always enabled,
// so this shouldn't happen
throw new Error(x);
}
return result.with(ca, 0, cb.position());
}
}
static Result decode(String charsetName, byte[] ba, int off, int len)
throws UnsupportedEncodingException
{
StringDecoder sd = deref(decoder);
String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
if ((sd == null) || !(csn.equals(sd.requestedCharsetName())
|| csn.equals(sd.charsetName()))) {
sd = null;
try {
Charset cs = lookupCharset(csn);
if (cs != null) {
if (cs == UTF_8) {
return decodeUTF8(ba, off, len, true);
}
if (cs == ISO_8859_1) {
return decodeLatin1(ba, off, len);
}
if (cs == US_ASCII) {
return decodeASCII(ba, off, len);
}
sd = new StringDecoder(cs, csn);
}
} catch (IllegalCharsetNameException x) {}
if (sd == null)
throw new UnsupportedEncodingException(csn);
set(decoder, sd);
}
return sd.decode(ba, off, len);
}
static Result decode(Charset cs, byte[] ba, int off, int len) {
if (cs == UTF_8) {
return decodeUTF8(ba, off, len, true);
}
if (cs == ISO_8859_1) {
return decodeLatin1(ba, off, len);
}
if (cs == US_ASCII) {
return decodeASCII(ba, off, len);
}
// (1)We never cache the "external" cs, the only benefit of creating
// an additional StringDe/Encoder object to wrap it is to share the
// de/encode() method. These SD/E objects are short-lived, the young-gen
// gc should be able to take care of them well. But the best approach
// is still not to generate them if not really necessary.
// (2)The defensive copy of the input byte/char[] has a big performance
// impact, as well as the outgoing result byte/char[]. Need to do the
// optimization check of (sm==null && classLoader0==null) for both.
// (3)There might be a timing gap in isTrusted setting. getClassLoader0()
// is only checked (and then isTrusted gets set) when (SM==null). It is
// possible that the SM==null for now but then SM is NOT null later
// when safeTrim() is invoked...the "safe" way to do is to redundant
// check (... && (isTrusted || SM == null || getClassLoader0())) in trim
// but it then can be argued that the SM is null when the operation
// is started...
CharsetDecoder cd = cs.newDecoder();
// ascii fastpath
if ((cd instanceof ArrayDecoder) &&
((ArrayDecoder)cd).isASCIICompatible() && !hasNegatives(ba, off, len)) {
return decodeLatin1(ba, off, len);
}
int en = scale(len, cd.maxCharsPerByte());
if (len == 0) {
return new Result().with();
}
cd.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE)
.reset();
char[] ca = new char[en];
if (cd instanceof ArrayDecoder) {
int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
return new Result().with(ca, 0, clen);
}
if (cs.getClass().getClassLoader0() != null &&
System.getSecurityManager() != null) {
ba = Arrays.copyOfRange(ba, off, off + len);
off = 0;
}
ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
CharBuffer cb = CharBuffer.wrap(ca);
try {
CoderResult cr = cd.decode(bb, cb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = cd.flush(cb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
// Substitution is always enabled,
// so this shouldn't happen
throw new Error(x);
}
return new Result().with(ca, 0, cb.position());
}
static Result decode(byte[] ba, int off, int len) {
Charset cs = Charset.defaultCharset();
if (cs == UTF_8) {
return decodeUTF8(ba, off, len, true);
}
if (cs == ISO_8859_1) {
return decodeLatin1(ba, off, len);
}
if (cs == US_ASCII) {
return decodeASCII(ba, off, len);
}
StringDecoder sd = deref(decoder);
if (sd == null || !cs.name().equals(sd.cs.name())) {
sd = new StringDecoder(cs, cs.name());
set(decoder, sd);
}
return sd.decode(ba, off, len);
}
// -- Encoding --
private static class StringEncoder {
private Charset cs;
private CharsetEncoder ce;
private final boolean isASCIICompatible;
private final String requestedCharsetName;
private final boolean isTrusted;
private StringEncoder(Charset cs, String rcn) {
this.requestedCharsetName = rcn;
this.cs = cs;
this.ce = cs.newEncoder()
.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE);
this.isTrusted = (cs.getClass().getClassLoader0() == null);
this.isASCIICompatible = (ce instanceof ArrayEncoder) &&
((ArrayEncoder)ce).isASCIICompatible();
}
String charsetName() {
if (cs instanceof HistoricallyNamedCharset)
return ((HistoricallyNamedCharset)cs).historicalName();
return cs.name();
}
final String requestedCharsetName() {
return requestedCharsetName;
}
byte[] encode(byte coder, byte[] val) {
// fastpath for ascii compatible
if (coder == LATIN1 && isASCIICompatible &&
!hasNegatives(val, 0, val.length)) {
return Arrays.copyOf(val, val.length);
}
int len = val.length >> coder; // assume LATIN1=0/UTF16=1;
int en = scale(len, ce.maxBytesPerChar());
byte[] ba = new byte[en];
if (len == 0) {
return ba;
}
if (ce instanceof ArrayEncoder) {
int blen = (coder == LATIN1 ) ? ((ArrayEncoder)ce).encodeFromLatin1(val, 0, len, ba)
: ((ArrayEncoder)ce).encodeFromUTF16(val, 0, len, ba);
if (blen != -1) {
return safeTrim(ba, blen, isTrusted);
}
}
char[] ca = (coder == LATIN1 ) ? StringLatin1.toChars(val)
: StringUTF16.toChars(val);
ce.reset();
ByteBuffer bb = ByteBuffer.wrap(ba);
CharBuffer cb = CharBuffer.wrap(ca, 0, len);
try {
CoderResult cr = ce.encode(cb, bb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = ce.flush(bb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
// Substitution is always enabled,
// so this shouldn't happen
throw new Error(x);
}
return safeTrim(ba, bb.position(), isTrusted);
}
}
static byte[] encode(String charsetName, byte coder, byte[] val)
throws UnsupportedEncodingException
{
StringEncoder se = deref(encoder);
String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
if ((se == null) || !(csn.equals(se.requestedCharsetName())
|| csn.equals(se.charsetName()))) {
se = null;
try {
Charset cs = lookupCharset(csn);
if (cs != null) {
if (cs == UTF_8) {
return encodeUTF8(coder, val, true);
}
if (cs == ISO_8859_1) {
return encode8859_1(coder, val);
}
if (cs == US_ASCII) {
return encodeASCII(coder, val);
}
se = new StringEncoder(cs, csn);
}
} catch (IllegalCharsetNameException x) {}
if (se == null) {
throw new UnsupportedEncodingException (csn);
}
set(encoder, se);
}
return se.encode(coder, val);
}
static byte[] encode(Charset cs, byte coder, byte[] val) {
if (cs == UTF_8) {
return encodeUTF8(coder, val, true);
}
if (cs == ISO_8859_1) {
return encode8859_1(coder, val);
}
if (cs == US_ASCII) {
return encodeASCII(coder, val);
}
CharsetEncoder ce = cs.newEncoder();
// fastpath for ascii compatible
if (coder == LATIN1 && (((ce instanceof ArrayEncoder) &&
((ArrayEncoder)ce).isASCIICompatible() &&
!hasNegatives(val, 0, val.length)))) {
return Arrays.copyOf(val, val.length);
}
int len = val.length >> coder; // assume LATIN1=0/UTF16=1;
int en = scale(len, ce.maxBytesPerChar());
byte[] ba = new byte[en];
if (len == 0) {
return ba;
}
ce.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE)
.reset();
if (ce instanceof ArrayEncoder) {
int blen = (coder == LATIN1 ) ? ((ArrayEncoder)ce).encodeFromLatin1(val, 0, len, ba)
: ((ArrayEncoder)ce).encodeFromUTF16(val, 0, len, ba);
if (blen != -1) {
return safeTrim(ba, blen, true);
}
}
boolean isTrusted = cs.getClass().getClassLoader0() == null ||
System.getSecurityManager() == null;
char[] ca = (coder == LATIN1 ) ? StringLatin1.toChars(val)
: StringUTF16.toChars(val);
ByteBuffer bb = ByteBuffer.wrap(ba);
CharBuffer cb = CharBuffer.wrap(ca, 0, len);
try {
CoderResult cr = ce.encode(cb, bb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = ce.flush(bb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
throw new Error(x);
}
return safeTrim(ba, bb.position(), isTrusted);
}
static byte[] encode(byte coder, byte[] val) {
Charset cs = Charset.defaultCharset();
if (cs == UTF_8) {
return encodeUTF8(coder, val, true);
}
if (cs == ISO_8859_1) {
return encode8859_1(coder, val);
}
if (cs == US_ASCII) {
return encodeASCII(coder, val);
}
StringEncoder se = deref(encoder);
if (se == null || !cs.name().equals(se.cs.name())) {
se = new StringEncoder(cs, cs.name());
set(encoder, se);
}
return se.encode(coder, val);
}
/**
* Print a message directly to stderr, bypassing all character conversion
* methods.
* @param msg message to print
*/
private static native void err(String msg);
/* The cached Result for each thread */
private static final ThreadLocal<StringCoding.Result>
resultCached = new ThreadLocal<>() {
protected StringCoding.Result initialValue() {
return new StringCoding.Result();
}};
////////////////////////// ascii //////////////////////////////
private static Result decodeASCII(byte[] ba, int off, int len) {
Result result = resultCached.get();
if (COMPACT_STRINGS && !hasNegatives(ba, off, len)) {
return result.with(Arrays.copyOfRange(ba, off, off + len),
LATIN1);
}
byte[] dst = new byte[len<<1];
int dp = 0;
while (dp < len) {
int b = ba[off++];
putChar(dst, dp++, (b >= 0) ? (char)b : repl);
}
return result.with(dst, UTF16);
}
private static byte[] encodeASCII(byte coder, byte[] val) {
if (coder == LATIN1) {
byte[] dst = new byte[val.length];
for (int i = 0; i < val.length; i++) {
if (val[i] < 0) {
dst[i] = '?';
} else {
dst[i] = val[i];
}
}
return dst;
}
int len = val.length >> 1;
byte[] dst = new byte[len];
int dp = 0;
for (int i = 0; i < len; i++) {
char c = StringUTF16.getChar(val, i);
if (c < 0x80) {
dst[dp++] = (byte)c;
continue;
}
if (Character.isHighSurrogate(c) && i + 1 < len &&
Character.isLowSurrogate(StringUTF16.getChar(val, i + 1))) {
i++;
}
dst[dp++] = '?';
}
if (len == dp) {
return dst;
}
return Arrays.copyOf(dst, dp);
}
////////////////////////// latin1/8859_1 ///////////////////////////
private static Result decodeLatin1(byte[] ba, int off, int len) {
Result result = resultCached.get();
if (COMPACT_STRINGS) {
return result.with(Arrays.copyOfRange(ba, off, off + len), LATIN1);
} else {
return result.with(StringLatin1.inflate(ba, off, len), UTF16);
}
}
@HotSpotIntrinsicCandidate
private static int implEncodeISOArray(byte[] sa, int sp,
byte[] da, int dp, int len) {
int i = 0;
for (; i < len; i++) {
char c = StringUTF16.getChar(sa, sp++);
if (c > '\u00FF')
break;
da[dp++] = (byte)c;
}
return i;
}
private static byte[] encode8859_1(byte coder, byte[] val) {
return encode8859_1(coder, val, true);
}
private static byte[] encode8859_1(byte coder, byte[] val, boolean doReplace) {
if (coder == LATIN1) {
return Arrays.copyOf(val, val.length);
}
int len = val.length >> 1;
byte[] dst = new byte[len];
int dp = 0;
int sp = 0;
int sl = len;
while (sp < sl) {
int ret = implEncodeISOArray(val, sp, dst, dp, len);
sp = sp + ret;
dp = dp + ret;
if (ret != len) {
if (!doReplace) {
throwUnmappable(sp, 1);
}
char c = StringUTF16.getChar(val, sp++);
if (Character.isHighSurrogate(c) && sp < sl &&
Character.isLowSurrogate(StringUTF16.getChar(val, sp))) {
sp++;
}
dst[dp++] = '?';
len = sl - sp;
}
}
if (dp == dst.length) {
return dst;
}
return Arrays.copyOf(dst, dp);
}
//////////////////////////////// utf8 ////////////////////////////////////
private static boolean isNotContinuation(int b) {
return (b & 0xc0) != 0x80;
}
private static boolean isMalformed3(int b1, int b2, int b3) {
return (b1 == (byte)0xe0 && (b2 & 0xe0) == 0x80) ||
(b2 & 0xc0) != 0x80 || (b3 & 0xc0) != 0x80;
}
private static boolean isMalformed3_2(int b1, int b2) {
return (b1 == (byte)0xe0 && (b2 & 0xe0) == 0x80) ||
(b2 & 0xc0) != 0x80;
}
private static boolean isMalformed4(int b2, int b3, int b4) {
return (b2 & 0xc0) != 0x80 || (b3 & 0xc0) != 0x80 ||
(b4 & 0xc0) != 0x80;
}
private static boolean isMalformed4_2(int b1, int b2) {
return (b1 == 0xf0 && (b2 < 0x90 || b2 > 0xbf)) ||
(b1 == 0xf4 && (b2 & 0xf0) != 0x80) ||
(b2 & 0xc0) != 0x80;
}
private static boolean isMalformed4_3(int b3) {
return (b3 & 0xc0) != 0x80;
}
// for nb == 3/4
private static int malformedN(byte[] src, int sp, int nb) {
if (nb == 3) {
int b1 = src[sp++];
int b2 = src[sp++]; // no need to lookup b3
return ((b1 == (byte)0xe0 && (b2 & 0xe0) == 0x80) ||
isNotContinuation(b2)) ? 1 : 2;
} else if (nb == 4) { // we don't care the speed here
int b1 = src[sp++] & 0xff;
int b2 = src[sp++] & 0xff;
if (b1 > 0xf4 ||
(b1 == 0xf0 && (b2 < 0x90 || b2 > 0xbf)) ||
(b1 == 0xf4 && (b2 & 0xf0) != 0x80) ||
isNotContinuation(b2))
return 1;
if (isNotContinuation(src[sp++]))
return 2;
return 3;
}
assert false;
return -1;
}
private static void throwMalformed(int off, int nb) {
String msg = "malformed input off : " + off + ", length : " + nb;
throw new IllegalArgumentException(msg, new MalformedInputException(nb));
}
private static void throwMalformed(byte[] val) {
int dp = 0;
while (dp < val.length && val[dp] >=0) { dp++; }
throwMalformed(dp, 1);
}
private static void throwUnmappable(int off, int nb) {
String msg = "malformed input off : " + off + ", length : " + nb;
throw new IllegalArgumentException(msg, new UnmappableCharacterException(nb));
}
private static void throwUnmappable(byte[] val) {
int dp = 0;
while (dp < val.length && val[dp] >=0) { dp++; }
throwUnmappable(dp, 1);
}
private static char repl = '\ufffd';
private static Result decodeUTF8(byte[] src, int sp, int len, boolean doReplace) {
// ascii-bais, which has a relative impact to the non-ascii-only bytes
if (COMPACT_STRINGS && !hasNegatives(src, sp, len))
return resultCached.get().with(Arrays.copyOfRange(src, sp, sp + len),
LATIN1);
return decodeUTF8_0(src, sp, len, doReplace);
}
private static Result decodeUTF8_0(byte[] src, int sp, int len, boolean doReplace) {
Result ret = resultCached.get();
int sl = sp + len;
int dp = 0;
byte[] dst = new byte[len];
if (COMPACT_STRINGS) {
while (sp < sl) {
int b1 = src[sp];
if (b1 >= 0) {
dst[dp++] = (byte)b1;
sp++;
continue;
}
if ((b1 == (byte)0xc2 || b1 == (byte)0xc3) &&
sp + 1 < sl) {
int b2 = src[sp + 1];
if (!isNotContinuation(b2)) {
dst[dp++] = (byte)(((b1 << 6) ^ b2)^
(((byte) 0xC0 << 6) ^
((byte) 0x80 << 0)));
sp += 2;
continue;
}
}
// anything not a latin1, including the repl
// we have to go with the utf16
break;
}
if (sp == sl) {
if (dp != dst.length) {
dst = Arrays.copyOf(dst, dp);
}
return ret.with(dst, LATIN1);
}
}
if (dp == 0) {
dst = new byte[len << 1];
} else {
byte[] buf = new byte[len << 1];
StringLatin1.inflate(dst, 0, buf, 0, dp);
dst = buf;
}
while (sp < sl) {
int b1 = src[sp++];
if (b1 >= 0) {
putChar(dst, dp++, (char) b1);
} else if ((b1 >> 5) == -2 && (b1 & 0x1e) != 0) {
if (sp < sl) {
int b2 = src[sp++];
if (isNotContinuation(b2)) {
if (!doReplace) {
throwMalformed(sp - 1, 1);
}
putChar(dst, dp++, repl);
sp--;
} else {
putChar(dst, dp++, (char)(((b1 << 6) ^ b2)^
(((byte) 0xC0 << 6) ^
((byte) 0x80 << 0))));
}
continue;
}
if (!doReplace) {
throwMalformed(sp, 1); // underflow()
}
putChar(dst, dp++, repl);
break;
} else if ((b1 >> 4) == -2) {
if (sp + 1 < sl) {
int b2 = src[sp++];
int b3 = src[sp++];
if (isMalformed3(b1, b2, b3)) {
if (!doReplace) {
throwMalformed(sp - 3, 3);
}
putChar(dst, dp++, repl);
sp -= 3;
sp += malformedN(src, sp, 3);
} else {
char c = (char)((b1 << 12) ^
(b2 << 6) ^
(b3 ^
(((byte) 0xE0 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
if (isSurrogate(c)) {
if (!doReplace) {
throwMalformed(sp - 3, 3);
}
putChar(dst, dp++, repl);
} else {
putChar(dst, dp++, c);
}
}
continue;
}
if (sp < sl && isMalformed3_2(b1, src[sp])) {
if (!doReplace) {
throwMalformed(sp - 1, 2);
}
putChar(dst, dp++, repl);
continue;
}
if (!doReplace){
throwMalformed(sp, 1);
}
putChar(dst, dp++, repl);
break;
} else if ((b1 >> 3) == -2) {
if (sp + 2 < sl) {
int b2 = src[sp++];
int b3 = src[sp++];
int b4 = src[sp++];
int uc = ((b1 << 18) ^
(b2 << 12) ^
(b3 << 6) ^
(b4 ^
(((byte) 0xF0 << 18) ^
((byte) 0x80 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
if (isMalformed4(b2, b3, b4) ||
!isSupplementaryCodePoint(uc)) { // shortest form check
if (!doReplace) {
throwMalformed(sp - 4, 4);
}
putChar(dst, dp++, repl);
sp -= 4;
sp += malformedN(src, sp, 4);
} else {
putChar(dst, dp++, highSurrogate(uc));
putChar(dst, dp++, lowSurrogate(uc));
}
continue;
}
b1 &= 0xff;
if (b1 > 0xf4 ||
sp < sl && isMalformed4_2(b1, src[sp] & 0xff)) {
if (!doReplace) {
throwMalformed(sp - 1, 1); // or 2
}
putChar(dst, dp++, repl);
continue;
}
if (!doReplace) {
throwMalformed(sp - 1, 1);
}
sp++;
putChar(dst, dp++, repl);
if (sp < sl && isMalformed4_3(src[sp])) {
continue;
}
break;
} else {
if (!doReplace) {
throwMalformed(sp - 1, 1);
}
putChar(dst, dp++, repl);
}
}
if (dp != len) {
dst = Arrays.copyOf(dst, dp << 1);
}
return ret.with(dst, UTF16);
}
private static byte[] encodeUTF8(byte coder, byte[] val, boolean doReplace) {
if (coder == UTF16)
return encodeUTF8_UTF16(val, doReplace);
if (!hasNegatives(val, 0, val.length))
return Arrays.copyOf(val, val.length);
int dp = 0;
byte[] dst = new byte[val.length << 1];
for (int sp = 0; sp < val.length; sp++) {
byte c = val[sp];
if (c < 0) {
dst[dp++] = (byte)(0xc0 | ((c & 0xff) >> 6));
dst[dp++] = (byte)(0x80 | (c & 0x3f));
} else {
dst[dp++] = c;
}
}
if (dp == dst.length)
return dst;
return Arrays.copyOf(dst, dp);
}
private static byte[] encodeUTF8_UTF16(byte[] val, boolean doReplace) {
int dp = 0;
int sp = 0;
int sl = val.length >> 1;
byte[] dst = new byte[sl * 3];
char c;
while (sp < sl && (c = StringUTF16.getChar(val, sp)) < '\u0080') {
// ascii fast loop;
dst[dp++] = (byte)c;
sp++;
}
while (sp < sl) {
c = StringUTF16.getChar(val, sp++);
if (c < 0x80) {
dst[dp++] = (byte)c;
} else if (c < 0x800) {
dst[dp++] = (byte)(0xc0 | (c >> 6));
dst[dp++] = (byte)(0x80 | (c & 0x3f));
} else if (Character.isSurrogate(c)) {
int uc = -1;
char c2;
if (Character.isHighSurrogate(c) && sp < sl &&
Character.isLowSurrogate(c2 = StringUTF16.getChar(val, sp))) {
uc = Character.toCodePoint(c, c2);
}
if (uc < 0) {
if (doReplace) {
dst[dp++] = '?';
} else {
throwUnmappable(sp - 1, 1); // or 2, does not matter here
}
} else {
dst[dp++] = (byte)(0xf0 | ((uc >> 18)));
dst[dp++] = (byte)(0x80 | ((uc >> 12) & 0x3f));
dst[dp++] = (byte)(0x80 | ((uc >> 6) & 0x3f));
dst[dp++] = (byte)(0x80 | (uc & 0x3f));
sp++; // 2 chars
}
} else {
// 3 bytes, 16 bits
dst[dp++] = (byte)(0xe0 | ((c >> 12)));
dst[dp++] = (byte)(0x80 | ((c >> 6) & 0x3f));
dst[dp++] = (byte)(0x80 | (c & 0x3f));
}
}
if (dp == dst.length) {
return dst;
}
return Arrays.copyOf(dst, dp);
}
////////////////////// for j.u.z.ZipCoder //////////////////////////
/*
* Throws iae, instead of replacing, if malformed or unmappable.
*/
static String newStringUTF8NoRepl(byte[] src, int off, int len) {
if (COMPACT_STRINGS && !hasNegatives(src, off, len))
return new String(Arrays.copyOfRange(src, off, off + len), LATIN1);
Result ret = decodeUTF8_0(src, off, len, false);
return new String(ret.value, ret.coder);
}
/*
* Throws iae, instead of replacing, if unmappable.
*/
static byte[] getBytesUTF8NoRepl(String s) {
return encodeUTF8(s.coder(), s.value(), false);
}
////////////////////// for j.n.f.Files //////////////////////////
private static boolean isASCII(byte[] src) {
return !hasNegatives(src, 0, src.length);
}
private static String newStringLatin1(byte[] src) {
if (COMPACT_STRINGS)
return new String(src, LATIN1);
return new String(StringLatin1.inflate(src, 0, src.length), UTF16);
}
static String newStringNoRepl(byte[] src, Charset cs) throws CharacterCodingException {
try {
return newStringNoRepl1(src, cs);
} catch (IllegalArgumentException e) {
//newStringNoRepl1 throws IAE with MalformedInputException or CCE as the cause
Throwable cause = e.getCause();
if (cause instanceof MalformedInputException) {
throw (MalformedInputException)cause;
}
throw (CharacterCodingException)cause;
}
}
static String newStringNoRepl1(byte[] src, Charset cs) {
if (cs == UTF_8) {
if (COMPACT_STRINGS && isASCII(src))
return new String(src, LATIN1);
Result ret = decodeUTF8_0(src, 0, src.length, false);
return new String(ret.value, ret.coder);
}
if (cs == ISO_8859_1) {
return newStringLatin1(src);
}
if (cs == US_ASCII) {
if (isASCII(src)) {
return newStringLatin1(src);
} else {
throwMalformed(src);
}
}
CharsetDecoder cd = cs.newDecoder();
// ascii fastpath
if ((cd instanceof ArrayDecoder) &&
((ArrayDecoder)cd).isASCIICompatible() && isASCII(src)) {
return newStringLatin1(src);
}
int len = src.length;
if (len == 0) {
return "";
}
int en = scale(len, cd.maxCharsPerByte());
char[] ca = new char[en];
if (cs.getClass().getClassLoader0() != null &&
System.getSecurityManager() != null) {
src = Arrays.copyOf(src, len);
}
ByteBuffer bb = ByteBuffer.wrap(src);
CharBuffer cb = CharBuffer.wrap(ca);
try {
CoderResult cr = cd.decode(bb, cb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = cd.flush(cb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
throw new IllegalArgumentException(x); // todo
}
Result ret = resultCached.get().with(ca, 0, cb.position());
return new String(ret.value, ret.coder);
}
/*
* Throws CCE, instead of replacing, if unmappable.
*/
static byte[] getBytesNoRepl(String s, Charset cs) throws CharacterCodingException {
try {
return getBytesNoRepl1(s, cs);
} catch (IllegalArgumentException e) {
//getBytesNoRepl1 throws IAE with UnmappableCharacterException or CCE as the cause
Throwable cause = e.getCause();
if (cause instanceof UnmappableCharacterException) {
throw (UnmappableCharacterException)cause;
}
throw (CharacterCodingException)cause;
}
}
static byte[] getBytesNoRepl1(String s, Charset cs) {
byte[] val = s.value();
byte coder = s.coder();
if (cs == UTF_8) {
if (isASCII(val)) {
return val;
}
return encodeUTF8(coder, val, false);
}
if (cs == ISO_8859_1) {
if (coder == LATIN1) {
return val;
}
return encode8859_1(coder, val, false);
}
if (cs == US_ASCII) {
if (coder == LATIN1) {
if (isASCII(val)) {
return val;
} else {
throwUnmappable(val);
}
}
}
CharsetEncoder ce = cs.newEncoder();
// fastpath for ascii compatible
if (coder == LATIN1 && (((ce instanceof ArrayEncoder) &&
((ArrayEncoder)ce).isASCIICompatible() &&
isASCII(val)))) {
return val;
}
int len = val.length >> coder; // assume LATIN1=0/UTF16=1;
int en = scale(len, ce.maxBytesPerChar());
byte[] ba = new byte[en];
if (len == 0) {
return ba;
}
if (ce instanceof ArrayEncoder) {
int blen = (coder == LATIN1 ) ? ((ArrayEncoder)ce).encodeFromLatin1(val, 0, len, ba)
: ((ArrayEncoder)ce).encodeFromUTF16(val, 0, len, ba);
if (blen != -1) {
return safeTrim(ba, blen, true);
}
}
boolean isTrusted = cs.getClass().getClassLoader0() == null ||
System.getSecurityManager() == null;
char[] ca = (coder == LATIN1 ) ? StringLatin1.toChars(val)
: StringUTF16.toChars(val);
ByteBuffer bb = ByteBuffer.wrap(ba);
CharBuffer cb = CharBuffer.wrap(ca, 0, len);
try {
CoderResult cr = ce.encode(cb, bb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = ce.flush(bb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
throw new IllegalArgumentException(x);
}
return safeTrim(ba, bb.position(), isTrusted);
}
}
⏎ java/lang/StringCoding.java
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File name: java.base-11.0.1-src.zip File size: 8740354 bytes Release date: 2018-11-04 Download
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