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Support 4 byte UTF-8 sequences

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Fixes lengthAsUtf8, encodeToUtf8, and isValidUtf8 to support UTF-8's
4-byte sequences or UTF-16's surrogate pairs properly.
Invalid surrogate pairs are converted to '?' as Java's converter does
This commit is contained in:
gamax92
2019-08-11 13:05:54 +02:00
committed by asie
parent 5026b5ac1e
commit c666a507ab
1 changed files with 56 additions and 25 deletions
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79
src/core/org/luaj/vm2/LuaString.java
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@@ -639,9 +639,15 @@ public class LuaString extends LuaValue {
public static String decodeAsUtf8(byte[] bytes, int offset, int length) {
int i,j,n,b;
for ( i=offset,j=offset+length,n=0; i<j; ++n ) {
switch ( 0xE0 & bytes[i++] ) {
case 0xE0: ++i;
case 0xC0: ++i;
byte v = bytes[i++];
if ((v & 0xC0) == 0xC0) {
++i;
if ((v & 0xE0) == 0xE0) {
++i;
if ((v & 0xF0) == 0xF0) {
++i;
}
}
}
}
char[] chars=new char[n];
@@ -663,11 +669,24 @@ public class LuaString extends LuaValue {
* @see #isValidUtf8()
*/
public static int lengthAsUtf8(char[] chars) {
int i,b;
int i, b;
char c;
for ( i=b=chars.length; --i>=0; )
if ( (c=chars[i]) >=0x80 )
b += (c>=0x800)? 2: 1;
for (i = 0, b = 0; i < chars.length; i++) {
if ((c = chars[i]) < 0x80 || (c >= 0xdc00 && c < 0xe000)) {
b += 1;
} else if (c < 0x800) {
b += 2;
} else if (c >= 0xd800 && c < 0xdc00) {
if (i + 1 < chars.length && chars[i+1] >= 0xdc00 && chars[i+1] < 0xe000) {
b += 4;
i++;
} else {
b += 1;
}
} else {
b += 3;
}
}
return b;
}
@@ -689,16 +708,28 @@ public class LuaString extends LuaValue {
public static int encodeToUtf8(char[] chars, int nchars, byte[] bytes, int off) {
char c;
int j = off;
for ( int i=0; i<nchars; i++ ) {
if ( (c = chars[i]) < 0x80 ) {
for (int i = 0; i < nchars; i++) {
if ((c = chars[i]) < 0x80) {
bytes[j++] = (byte) c;
} else if ( c < 0x800 ) {
bytes[j++] = (byte) (0xC0 | ((c>>6) & 0x1f));
bytes[j++] = (byte) (0x80 | ( c & 0x3f));
} else if (c < 0x800) {
bytes[j++] = (byte) (0xC0 | ((c >> 6)));
bytes[j++] = (byte) (0x80 | (c & 0x3f));
} else if (c >= 0xd800 && c < 0xdc00) {
if (i + 1 < nchars && chars[i+1] >= 0xdc00 && chars[i+1] < 0xe000) {
int uc = 0x10000 + (((c & 0x3ff) << 10) | (chars[++i] & 0x3ff));
bytes[j++] = (byte) (0xF0 | ((uc >> 18)));
bytes[j++] = (byte) (0x80 | ((uc >> 12) & 0x3f));
bytes[j++] = (byte) (0x80 | ((uc >> 6) & 0x3f));
bytes[j++] = (byte) (0x80 | (uc & 0x3f));
} else {
bytes[j++] = (byte) (0xE0 | ((c>>12) & 0x0f));
bytes[j++] = (byte) (0x80 | ((c>>6) & 0x3f));
bytes[j++] = (byte) (0x80 | ( c & 0x3f));
bytes[j++] = (byte) '?';
}
} else if (c >= 0xdc00 && c < 0xe000) {
bytes[j++] = (byte) '?';
} else {
bytes[j++] = (byte) (0xE0 | ((c >> 12)));
bytes[j++] = (byte) (0x80 | ((c >> 6) & 0x3f));
bytes[j++] = (byte) (0x80 | (c & 0x3f));
}
}
return j - off;
@@ -711,16 +742,16 @@ public class LuaString extends LuaValue {
* @see #decodeAsUtf8(byte[], int, int)
*/
public boolean isValidUtf8() {
for (int i=m_offset,j=m_offset+m_length; i<j;) {
for (int i = m_offset, j = m_offset + m_length; i < j;) {
int c = m_bytes[i++];
if ( c >= 0 ) continue;
if ( ((c & 0xE0) == 0xC0)
&& i<j
&& (m_bytes[i++] & 0xC0) == 0x80) continue;
if ( ((c & 0xF0) == 0xE0)
&& i+1<j
&& (m_bytes[i++] & 0xC0) == 0x80
&& (m_bytes[i++] & 0xC0) == 0x80) continue;
if (c >= 0)
continue;
if (((c & 0xE0) == 0xC0) && i < j && (m_bytes[i++] & 0xC0) == 0x80)
continue;
if (((c & 0xF0) == 0xE0) && i + 1 < j && (m_bytes[i++] & 0xC0) == 0x80 && (m_bytes[i++] & 0xC0) == 0x80)
continue;
if (((c & 0xF8) == 0xF0) && i + 2 < j && (m_bytes[i++] & 0xC0) == 0x80 && (m_bytes[i++] & 0xC0) == 0x80 && (m_bytes[i++] & 0xC0) == 0x80)
continue;
return false;
}
return true;