in core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java [1143:1427]
public final long readFieldNameHashCode() {
final char[] chars = this.chars;
char ch = this.ch;
if (ch == '/') {
skipComment();
ch = this.ch;
}
if (ch == '\'' && ((context.features & Feature.DisableSingleQuote.mask) != 0)) {
throw notSupportName();
}
if (ch != '"' && ch != '\'') {
if ((context.features & Feature.AllowUnQuotedFieldNames.mask) != 0 && isFirstIdentifier(ch)) {
return readFieldNameHashCodeUnquote();
}
if (ch == '}' || isNull()) {
return -1;
}
String errorMsg;
if (ch == '[' && nameBegin > 0) {
errorMsg = "illegal fieldName input " + ch + ", previous fieldName " + getFieldName();
} else {
errorMsg = "illegal fieldName input" + ch;
}
throw new JSONException(info(errorMsg));
}
final char quote = ch;
this.stringValue = null;
this.nameEscape = false;
int offset = this.nameBegin = this.offset, end = this.end;
long nameValue = 0;
if (offset + 9 < end) {
char c0 = chars[offset];
char c1 = chars[offset + 1];
char c2 = chars[offset + 2];
char c3 = chars[offset + 3];
char c4 = chars[offset + 4];
char c5 = chars[offset + 5];
char c6 = chars[offset + 6];
char c7 = chars[offset + 7];
char c8 = chars[offset + 8];
if (c0 == quote) {
nameValue = 0;
} else if (c1 == quote && c0 != 0 && c0 != '\\' && c0 <= 0xFF) {
nameValue = (byte) c0;
this.nameLength = 1;
this.nameEnd = offset + 1;
offset += 2;
} else if (c2 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF
) {
nameValue = (((byte) c1) << 8)
+ c0;
this.nameLength = 2;
this.nameEnd = offset + 2;
offset += 3;
} else if (c3 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF) {
nameValue
= (((byte) c2) << 16)
+ (c1 << 8)
+ c0;
this.nameLength = 3;
this.nameEnd = offset + 3;
offset += 4;
} else if (c4 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\' && c3 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF && c3 <= 0xFF
) {
nameValue
= (((byte) c3) << 24)
+ (c2 << 16)
+ (c1 << 8)
+ c0;
this.nameLength = 4;
this.nameEnd = offset + 4;
offset += 5;
} else if (c5 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\' && c3 != '\\' && c4 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF && c3 <= 0xFF && c4 <= 0xFF
) {
nameValue
= (((long) ((byte) c4)) << 32)
+ (((long) c3) << 24)
+ (((long) c2) << 16)
+ (((long) c1) << 8)
+ (long) c0;
this.nameLength = 5;
this.nameEnd = offset + 5;
offset += 6;
} else if (c6 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\' && c3 != '\\' && c4 != '\\' && c5 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF && c3 <= 0xFF && c4 <= 0xFF && c5 <= 0xFF
) {
nameValue
= (((long) ((byte) c5)) << 40)
+ (((long) c4) << 32)
+ (((long) c3) << 24)
+ (((long) c2) << 16)
+ (((long) c1) << 8)
+ (long) c0;
this.nameLength = 6;
this.nameEnd = offset + 6;
offset += 7;
} else if (c7 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\' && c3 != '\\' && c4 != '\\' && c5 != '\\' && c6 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF && c3 <= 0xFF && c4 <= 0xFF && c5 <= 0xFF && c6 <= 0xFF
) {
nameValue
= (((long) ((byte) c6)) << 48)
+ (((long) c5) << 40)
+ (((long) c4) << 32)
+ (((long) c3) << 24)
+ (((long) c2) << 16)
+ (((long) c1) << 8)
+ (long) c0;
this.nameLength = 7;
this.nameEnd = offset + 7;
offset += 8;
} else if (c8 == quote && c0 != 0
&& c0 != '\\' && c1 != '\\' && c2 != '\\' && c3 != '\\' && c4 != '\\' && c5 != '\\' && c6 != '\\' && c7 != '\\'
&& c0 <= 0xFF && c1 <= 0xFF && c2 <= 0xFF && c3 <= 0xFF && c4 <= 0xFF && c5 <= 0xFF && c6 <= 0xFF && c7 <= 0xFF
) {
nameValue
= (((long) ((byte) c7)) << 56)
+ (((long) c6) << 48)
+ (((long) c5) << 40)
+ (((long) c4) << 32)
+ (((long) c3) << 24)
+ (((long) c2) << 16)
+ (((long) c1) << 8)
+ (long) c0;
this.nameLength = 8;
this.nameEnd = offset + 8;
offset += 9;
}
}
if (nameValue == 0) {
for (int i = 0; offset < end; offset++, i++) {
char c = chars[offset];
if (c == quote) {
if (i == 0) {
offset = this.nameBegin;
break;
}
this.nameLength = i;
this.nameEnd = offset;
offset++;
break;
}
if (c == '\\') {
nameEscape = true;
c = chars[++offset];
switch (c) {
case 'u': {
c = (char) hexDigit4(chars, check3(offset + 1, end));
offset += 4;
break;
}
case 'x': {
c = char2(chars[offset + 1], chars[offset + 2]);
offset += 2;
break;
}
case '\\':
case '"':
default:
c = char1(c);
break;
}
}
if (c > 0xFF || i >= 8 || (i == 0 && c == 0)) {
nameValue = 0;
offset = this.nameBegin;
break;
}
switch (i) {
case 0:
nameValue = (byte) c;
break;
case 1:
nameValue = (((byte) c) << 8) + (nameValue & 0xFFL);
break;
case 2:
nameValue = (((byte) c) << 16) + (nameValue & 0xFFFFL);
break;
case 3:
nameValue = (((byte) c) << 24) + (nameValue & 0xFFFFFFL);
break;
case 4:
nameValue = (((long) (byte) c) << 32) + (nameValue & 0xFFFFFFFFL);
break;
case 5:
nameValue = (((long) (byte) c) << 40L) + (nameValue & 0xFFFFFFFFFFL);
break;
case 6:
nameValue = (((long) (byte) c) << 48L) + (nameValue & 0xFFFFFFFFFFFFL);
break;
case 7:
nameValue = (((long) (byte) c) << 56L) + (nameValue & 0xFFFFFFFFFFFFFFL);
break;
default:
break;
}
}
}
long hashCode;
if (nameValue != 0) {
hashCode = nameValue;
} else {
hashCode = Fnv.MAGIC_HASH_CODE;
for (int i = 0; ; ++i) {
char c = chars[offset];
if (c == '\\') {
nameEscape = true;
c = chars[++offset];
switch (c) {
case 'u': {
c = (char) hexDigit4(chars, check3(offset + 1, end));
offset += 4;
break;
}
case 'x': {
c = char2(chars[offset + 1], chars[offset + 2]);
offset += 2;
break;
}
case '\\':
case '"':
default:
c = char1(c);
break;
}
offset++;
hashCode ^= c;
hashCode *= Fnv.MAGIC_PRIME;
continue;
}
if (c == quote) {
this.nameLength = i;
this.nameEnd = offset;
offset++;
break;
}
offset++;
hashCode ^= c;
hashCode *= Fnv.MAGIC_PRIME;
}
}
char c = offset == end ? EOI : chars[offset++];
while (c <= ' ' && ((1L << c) & SPACE) != 0) {
c = offset == end ? EOI : chars[offset++];
}
if (c != ':') {
throw new JSONException(info("expect ':', but " + c));
}
c = offset == end ? EOI : chars[offset++];
while (c <= ' ' && ((1L << c) & SPACE) != 0) {
c = offset == end ? EOI : chars[offset++];
}
this.offset = offset;
this.ch = c;
return hashCode;
}