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252 lines (239 loc) · 10.5 KB
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package com.jsoniter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import static java.lang.Character.MIN_HIGH_SURROGATE;
import static java.lang.Character.MIN_LOW_SURROGATE;
import static java.lang.Character.MIN_SUPPLEMENTARY_CODE_POINT;
class IterImplString {
static int[] base64Tbl = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2,
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30,
31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
public static final String readString(JsonIterator iter) throws IOException {
byte c = iter.nextToken();
if (c == 'n') {
IterImplSkip.skipUntilBreak(iter);
return null;
}
if (c != '"') {
throw iter.reportError("readString", "expect n or \"");
}
// try fast path first
for (int i = iter.head, j = 0; i < iter.tail && j < iter.reusableChars.length; i++, j++) {
c = iter.buf[i];
if (c == '"') {
iter.head = i + 1;
return new String(iter.reusableChars, 0, j);
}
// If we encounter a backslash, which is a beginning of an escape sequence
// or a high bit was set - indicating an UTF-8 encoded multibyte character,
// there is no chance that we can decode the string without instantiating
// a temporary buffer, so quit this loop
if ((c ^ '\\') < 1) break;
iter.reusableChars[j] = (char) c;
}
return readStringSlowPath(iter);
}
final static String readStringSlowPath(JsonIterator iter) throws IOException {
// http://grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/sun/nio/cs/UTF_8.java/?v=source
// byte => char with support of escape in one pass
int j = 0;
int minimumCapacity = iter.reusableChars.length - 2;
for (; ; ) {
if (j == minimumCapacity) {
char[] newBuf = new char[iter.reusableChars.length * 2];
System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);
iter.reusableChars = newBuf;
minimumCapacity = iter.reusableChars.length - 2;
}
int b1 = iter.readByte();
if (b1 >= 0) {
if (b1 == '"') {
return new String(iter.reusableChars, 0, j);
} else if (b1 == '\\') {
int b2 = iter.readByte();
switch (b2) {
case '"':
iter.reusableChars[j++] = '"';
break;
case '\\':
iter.reusableChars[j++] = '\\';
break;
case '/':
iter.reusableChars[j++] = '/';
break;
case 'b':
iter.reusableChars[j++] = '\b';
break;
case 'f':
iter.reusableChars[j++] = '\f';
break;
case 'n':
iter.reusableChars[j++] = '\n';
break;
case 'r':
iter.reusableChars[j++] = '\r';
break;
case 't':
iter.reusableChars[j++] = '\t';
break;
case 'u':
iter.reusableChars[j++] = IterImplNumber.readU4(iter);
break;
default:
throw iter.reportError("readStringSlowPath", "unexpected escape char: " + b2);
}
} else {
// 1 byte, 7 bits: 0xxxxxxx
iter.reusableChars[j++] = (char) b1;
}
} else if ((b1 >> 5) == -2 && (b1 & 0x1e) != 0) {
// 2 bytes, 11 bits: 110xxxxx 10xxxxxx
int b2 = iter.readByte();
iter.reusableChars[j++] = (char) (((b1 << 6) ^ b2)
^
(((byte) 0xC0 << 6) ^
((byte) 0x80 << 0)));
} else if ((b1 >> 4) == -2) {
// 3 bytes, 16 bits: 1110xxxx 10xxxxxx 10xxxxxx
int b2 = iter.readByte();
int b3 = iter.readByte();
char c = (char)
((b1 << 12) ^
(b2 << 6) ^
(b3 ^
(((byte) 0xE0 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
iter.reusableChars[j++] = c;
} else if ((b1 >> 3) == -2) {
// 4 bytes, 21 bits: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
int b2 = iter.readByte();
int b3 = iter.readByte();
int b4 = iter.readByte();
int uc = ((b1 << 18) ^
(b2 << 12) ^
(b3 << 6) ^
(b4 ^
(((byte) 0xF0 << 18) ^
((byte) 0x80 << 12) ^
((byte) 0x80 << 6) ^
((byte) 0x80 << 0))));
iter.reusableChars[j++] = highSurrogate(uc);
iter.reusableChars[j++] = lowSurrogate(uc);
} else {
throw iter.reportError("readStringSlowPath", "unexpected input");
}
}
}
private static char highSurrogate(int codePoint) {
return (char) ((codePoint >>> 10)
+ (MIN_HIGH_SURROGATE - (MIN_SUPPLEMENTARY_CODE_POINT >>> 10)));
}
private static char lowSurrogate(int codePoint) {
return (char) ((codePoint & 0x3ff) + MIN_LOW_SURROGATE);
}
public static final byte[] readBase64(JsonIterator iter) throws IOException {
// from https://gist.github.com/EmilHernvall/953733
if (iter.nextToken() != '"') {
throw iter.reportError("readBase64", "expect \" for base64");
}
Slice slice = readSlice(iter);
if (slice == null) {
return null;
}
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int end = slice.head + slice.len;
for (int i = slice.head; i < end; i++) {
int b = 0;
if (base64Tbl[slice.data[i]] != -1) {
b = (base64Tbl[slice.data[i]] & 0xFF) << 18;
}
// skip unknown characters
else {
i++;
continue;
}
int num = 0;
if (i + 1 < end && base64Tbl[slice.data[i + 1]] != -1) {
b = b | ((base64Tbl[slice.data[i + 1]] & 0xFF) << 12);
num++;
}
if (i + 2 < end && base64Tbl[slice.data[i + 2]] != -1) {
b = b | ((base64Tbl[slice.data[i + 2]] & 0xFF) << 6);
num++;
}
if (i + 3 < end && base64Tbl[slice.data[i + 3]] != -1) {
b = b | (base64Tbl[slice.data[i + 3]] & 0xFF);
num++;
}
while (num > 0) {
int c = (b & 0xFF0000) >> 16;
buffer.write((char) c);
b <<= 8;
num--;
}
i += 4;
}
return buffer.toByteArray();
}
// read the bytes between " "
final static Slice readSlice(JsonIterator iter) throws IOException {
int end = findSliceEnd(iter);
if (end != -1) {
// reuse current buffer
iter.reusableSlice.data = iter.buf;
iter.reusableSlice.head = iter.head;
iter.reusableSlice.len = end - iter.head - 1;
iter.head = end;
return iter.reusableSlice;
}
byte[] part1 = new byte[iter.tail - iter.head];
System.arraycopy(iter.buf, iter.head, part1, 0, part1.length);
for (; ; ) {
if (!iter.loadMore()) {
throw iter.reportError("readSlice", "unmatched quote");
}
end = findSliceEnd(iter);
if (end == -1) {
byte[] part2 = new byte[part1.length + iter.buf.length];
System.arraycopy(part1, 0, part2, 0, part1.length);
System.arraycopy(iter.buf, 0, part2, part1.length, iter.buf.length);
part1 = part2;
} else {
byte[] part2 = new byte[part1.length + end - 1];
System.arraycopy(part1, 0, part2, 0, part1.length);
System.arraycopy(iter.buf, 0, part2, part1.length, end - 1);
iter.head = end;
iter.reusableSlice.data = part2;
iter.reusableSlice.head = 0;
iter.reusableSlice.len = part2.length;
return iter.reusableSlice;
}
}
}
// slice does not allow escape
final static int findSliceEnd(JsonIterator iter) {
for (int i = iter.head; i < iter.tail; i++) {
byte c = iter.buf[i];
if (c == '"') {
return i + 1;
} else if (c == '\\') {
throw iter.reportError("findSliceEnd", "slice does not support escape char");
}
}
return -1;
}
}
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