java/src/main/java/com/jsoniter/IterImplForStreaming.java at master · structure/java · GitHub

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package com.jsoniter;

import com.jsoniter.any.Any;

import com.jsoniter.spi.JsonException;

import com.jsoniter.spi.Slice;

import java.io.IOException;

class IterImplForStreaming {

public static final int readObjectFieldAsHash(JsonIterator iter) throws IOException {

if (nextToken(iter) != '"') {

throw iter.reportError("readObjectFieldAsHash", "expect \"");

}

long hash = 0x811c9dc5;

for (; ; ) {

byte c = 0;

int i = iter.head;

for (; i < iter.tail; i++) {

c = iter.buf[i];

if (c == '"') {

break;

}

hash ^= c;

hash *= 0x1000193;

}

if (c == '"') {

iter.head = i + 1;

if (nextToken(iter) != ':') {

throw iter.reportError("readObjectFieldAsHash", "expect :");

}

return (int) hash;

}

if (!loadMore(iter)) {

throw iter.reportError("readObjectFieldAsHash", "unmatched quote");

}

public static final Slice readObjectFieldAsSlice(JsonIterator iter) throws IOException {

Slice field = readSlice(iter);

boolean notCopied = field != null;

if (CodegenAccess.skipWhitespacesWithoutLoadMore(iter)) {

if (notCopied) {

int len = field.tail() - field.head();

byte[] newBuf = new byte[len];

System.arraycopy(field.data(), field.head(), newBuf, 0, len);

field.reset(newBuf, 0, newBuf.length);

}

if (!loadMore(iter)) {

throw iter.reportError("readObjectFieldAsSlice", "expect : after object field");

}

if (iter.buf[iter.head] != ':') {

throw iter.reportError("readObjectFieldAsSlice", "expect : after object field");

}

iter.head++;

return field;

}

final static void skipArray(JsonIterator iter) throws IOException {

int level = 1;

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

switch (iter.buf[i]) {

case '"': // If inside string, skip it

iter.head = i + 1;

skipString(iter);

i = iter.head - 1; // it will be i++ soon

break;

case '[': // If open symbol, increase level

level++;

break;

case ']': // If close symbol, decrease level

level--;

// If we have returned to the original level, we're done

if (level == 0) {

iter.head = i + 1;

return;

}

break;

}

if (!loadMore(iter)) {

return;

}

final static void skipObject(JsonIterator iter) throws IOException {

int level = 1;

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

switch (iter.buf[i]) {

case '"': // If inside string, skip it

iter.head = i + 1;

skipString(iter);

i = iter.head - 1; // it will be i++ soon

break;

case '{': // If open symbol, increase level

level++;

break;

case '}': // If close symbol, decrease level

level--;

// If we have returned to the original level, we're done

if (level == 0) {

iter.head = i + 1;

return;

}

break;

}

if (!loadMore(iter)) {

return;

}

final static void skipString(JsonIterator iter) throws IOException {

for (; ; ) {

int end = IterImplSkip.findStringEnd(iter);

if (end == -1) {

int j = iter.tail - 1;

boolean escaped = true;

// can not just look the last byte is \

// because it could be \\ or \\\

for (; ; ) {

// walk backward until head

if (j < iter.head || iter.buf[j] != '\\') {

// even number of backslashes

// either end of buffer, or " found

escaped = false;

break;

}

j--;

if (j < iter.head || iter.buf[j] != '\\') {

// odd number of backslashes

// it is \" or \\\"

break;

}

j--;

}

if (!loadMore(iter)) {

throw iter.reportError("skipString", "incomplete string");

}

if (escaped) {

// TODO add unit test to prove/verify bug

iter.head += 1; // skip the first char as last char is \

}

} else {

iter.head = end;

return;

}

final static void skipUntilBreak(JsonIterator iter) throws IOException {

// true, false, null, number

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

byte c = iter.buf[i];

if (IterImplSkip.breaks[c]) {

iter.head = i;

return;

}

if (!loadMore(iter)) {

iter.head = iter.tail;

return;

}

final static boolean skipNumber(JsonIterator iter) throws IOException {

// true, false, null, number

boolean dotFound = false;

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

byte c = iter.buf[i];

if (c == '.' || c == 'e' || c == 'E') {

dotFound = true;

continue;

}

if (IterImplSkip.breaks[c]) {

iter.head = i;

return dotFound;

}

if (!loadMore(iter)) {

iter.head = iter.tail;

return dotFound;

}

// read the bytes between " "

final static Slice readSlice(JsonIterator iter) throws IOException {

if (IterImpl.nextToken(iter) != '"') {

throw iter.reportError("readSlice", "expect \" for string");

}

int end = IterImplString.findSliceEnd(iter);

if (end != -1) {

// reuse current buffer

iter.reusableSlice.reset(iter.buf, iter.head, end - 1);

iter.head = end;

return iter.reusableSlice;

}

// TODO: avoid small memory allocation

byte[] part1 = new byte[iter.tail - iter.head];

System.arraycopy(iter.buf, iter.head, part1, 0, part1.length);

for (; ; ) {

if (!loadMore(iter)) {

throw iter.reportError("readSlice", "unmatched quote");

}

end = IterImplString.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.reset(part2, 0, part2.length);

return iter.reusableSlice;

}

final static byte nextToken(JsonIterator iter) throws IOException {

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

byte c = iter.buf[i];

switch (c) {

case ' ':

case '\n':

case '\t':

case '\r':

continue;

default:

iter.head = i + 1;

return c;

}

if (!loadMore(iter)) {

return 0;

}

public final static boolean loadMore(JsonIterator iter) throws IOException {

if (iter.in == null) {

return false;

}

if (iter.skipStartedAt != -1) {

return keepSkippedBytesThenRead(iter);

}

int n = iter.in.read(iter.buf);

if (n < 1) {

if (n == -1) {

return false;

} else {

throw iter.reportError("loadMore", "read from input stream returned " + n);

}

} else {

iter.head = 0;

iter.tail = n;

}

return true;

}

private static boolean keepSkippedBytesThenRead(JsonIterator iter) throws IOException {

int offset = iter.tail - iter.skipStartedAt;

byte[] srcBuffer = iter.buf;

// Check there is no unused buffer capacity

if ((getUnusedBufferByteCount(iter)) == 0) {

// If auto expand buffer enabled, then create larger buffer

if (iter.autoExpandBufferStep > 0) {

iter.buf = new byte[iter.buf.length + iter.autoExpandBufferStep];

} else {

throw iter.reportError("loadMore", String.format("buffer is full and autoexpansion is disabled. tail: [%s] skipStartedAt: [%s]", iter.tail, iter.skipStartedAt));

}

System.arraycopy(srcBuffer, iter.skipStartedAt, iter.buf, 0, offset);

int n = iter.in.read(iter.buf, offset, iter.buf.length - offset);

iter.skipStartedAt = 0;

if (n < 1) {

if (n == -1) {

return false;

} else {

throw iter.reportError("loadMore", "read from input stream returned " + n);

}

} else {

iter.head = offset;

iter.tail = offset + n;

}

return true;

}

private static int getUnusedBufferByteCount(JsonIterator iter) {

// Get bytes from 0 to skipStart + from tail till end

return iter.buf.length - iter.tail + iter.skipStartedAt;

}

final static byte readByte(JsonIterator iter) throws IOException {

if (iter.head == iter.tail) {

if (!loadMore(iter)) {

throw iter.reportError("readByte", "no more to read");

}

return iter.buf[iter.head++];

}

public static Any readAny(JsonIterator iter) throws IOException {

// TODO: avoid small memory allocation

iter.skipStartedAt = iter.head;

byte c = nextToken(iter);

switch (c) {

case '"':

skipString(iter);

byte[] copied = copySkippedBytes(iter);

return Any.lazyString(copied, 0, copied.length);

case 't':

skipFixedBytes(iter, 3);

iter.skipStartedAt = -1;

return Any.wrap(true);

case 'f':

skipFixedBytes(iter, 4);

iter.skipStartedAt = -1;

return Any.wrap(false);

case 'n':

skipFixedBytes(iter, 3);

iter.skipStartedAt = -1;

return Any.wrap((Object) null);

case '[':

skipArray(iter);

copied = copySkippedBytes(iter);

return Any.lazyArray(copied, 0, copied.length);

case '{':

skipObject(iter);

copied = copySkippedBytes(iter);

return Any.lazyObject(copied, 0, copied.length);

default:

if (skipNumber(iter)) {

copied = copySkippedBytes(iter);

return Any.lazyDouble(copied, 0, copied.length);

} else {

copied = copySkippedBytes(iter);

return Any.lazyLong(copied, 0, copied.length);

}

private static byte[] copySkippedBytes(JsonIterator iter) {

int start = iter.skipStartedAt;

iter.skipStartedAt = -1;

int end = iter.head;

byte[] bytes = new byte[end - start];

System.arraycopy(iter.buf, start, bytes, 0, bytes.length);

return bytes;

}

public static void skipFixedBytes(JsonIterator iter, int n) throws IOException {

iter.head += n;

if (iter.head >= iter.tail) {

int more = iter.head - iter.tail;

if (!loadMore(iter)) {

if (more == 0) {

iter.head = iter.tail;

return;

}

throw iter.reportError("skipFixedBytes", "unexpected end");

}

iter.head += more;

}

public static int updateStringCopyBound(final JsonIterator iter, final int bound) {

if (bound > iter.tail - iter.head) {

return iter.tail - iter.head;

} else {

return bound;

}

public final static int readStringSlowPath(JsonIterator iter, int j) throws IOException {

boolean isExpectingLowSurrogate = false;

for (;;) {

int bc = readByte(iter);

if (bc == '"') {

return j;

}

if (bc == '\\') {

bc = readByte(iter);

switch (bc) {

case 'b':

bc = '\b';

break;

case 't':

bc = '\t';

break;

case 'n':

bc = '\n';

break;

case 'f':

bc = '\f';

break;

case 'r':

bc = '\r';

break;

case '"':

case '/':

case '\\':

break;

case 'u':

bc = (IterImplString.translateHex(readByte(iter)) << 12) +

(IterImplString.translateHex(readByte(iter)) << 8) +

(IterImplString.translateHex(readByte(iter)) << 4) +

IterImplString.translateHex(readByte(iter));

if (Character.isHighSurrogate((char) bc)) {

if (isExpectingLowSurrogate) {

throw new JsonException("invalid surrogate");

} else {

isExpectingLowSurrogate = true;

}

} else if (Character.isLowSurrogate((char) bc)) {

if (isExpectingLowSurrogate) {

isExpectingLowSurrogate = false;

} else {

throw new JsonException("invalid surrogate");

}

} else {

if (isExpectingLowSurrogate) {

throw new JsonException("invalid surrogate");

}

break;

default:

throw iter.reportError("readStringSlowPath", "invalid escape character: " + bc);

}

} else if ((bc & 0x80) != 0) {

final int u2 = readByte(iter);

if ((bc & 0xE0) == 0xC0) {

bc = ((bc & 0x1F) << 6) + (u2 & 0x3F);

} else {

final int u3 = readByte(iter);

if ((bc & 0xF0) == 0xE0) {

bc = ((bc & 0x0F) << 12) + ((u2 & 0x3F) << 6) + (u3 & 0x3F);

} else {

final int u4 = readByte(iter);

if ((bc & 0xF8) == 0xF0) {

bc = ((bc & 0x07) << 18) + ((u2 & 0x3F) << 12) + ((u3 & 0x3F) << 6) + (u4 & 0x3F);

} else {

throw iter.reportError("readStringSlowPath", "invalid unicode character");

}

if (bc >= 0x10000) {

// check if valid unicode

if (bc >= 0x110000)

throw iter.reportError("readStringSlowPath", "invalid unicode character");

// split surrogates

final int sup = bc - 0x10000;

if (iter.reusableChars.length == j) {

char[] newBuf = new char[iter.reusableChars.length * 2];

System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);

iter.reusableChars = newBuf;

}

iter.reusableChars[j++] = (char) ((sup >>> 10) + 0xd800);

if (iter.reusableChars.length == j) {

char[] newBuf = new char[iter.reusableChars.length * 2];

System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);

iter.reusableChars = newBuf;

}

iter.reusableChars[j++] = (char) ((sup & 0x3ff) + 0xdc00);

continue;

}

if (iter.reusableChars.length == j) {

char[] newBuf = new char[iter.reusableChars.length * 2];

System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);

iter.reusableChars = newBuf;

}

iter.reusableChars[j++] = (char) bc;

}

static long readLongSlowPath(final JsonIterator iter, long value) throws IOException {

value = -value; // add negatives to avoid redundant checks for Long.MIN_VALUE on each iteration

long multmin = -922337203685477580L; // limit / 10

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

int ind = IterImplNumber.intDigits[iter.buf[i]];

if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {

iter.head = i;

return value;

}

if (value < multmin) {

throw iter.reportError("readLongSlowPath", "value is too large for long");

}

value = (value << 3) + (value << 1) - ind;

if (value >= 0) {

throw iter.reportError("readLongSlowPath", "value is too large for long");

}

if (!IterImpl.loadMore(iter)) {

iter.head = iter.tail;

return value;

}

static int readIntSlowPath(final JsonIterator iter, int value) throws IOException {

value = -value; // add negatives to avoid redundant checks for Integer.MIN_VALUE on each iteration

int multmin = -214748364; // limit / 10

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

int ind = IterImplNumber.intDigits[iter.buf[i]];

if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {

iter.head = i;

return value;

}

if (value < multmin) {

throw iter.reportError("readIntSlowPath", "value is too large for int");

}

value = (value << 3) + (value << 1) - ind;

if (value >= 0) {

throw iter.reportError("readIntSlowPath", "value is too large for int");

}

if (!IterImpl.loadMore(iter)) {

iter.head = iter.tail;

return value;

}

public static final double readDoubleSlowPath(final JsonIterator iter) throws IOException {

try {

numberChars numberChars = readNumber(iter);

if (numberChars.charsLength == 0 && iter.whatIsNext() == ValueType.STRING) {

String possibleInf = iter.readString();

if ("infinity".equals(possibleInf)) {

return Double.POSITIVE_INFINITY;

}

if ("-infinity".equals(possibleInf)) {

return Double.NEGATIVE_INFINITY;

}

throw iter.reportError("readDoubleSlowPath", "expect number but found string: " + possibleInf);

}

return Double.valueOf(new String(numberChars.chars, 0, numberChars.charsLength));

} catch (NumberFormatException e) {

throw iter.reportError("readDoubleSlowPath", e.toString());

}

static class numberChars {

char[] chars;

int charsLength;

boolean dotFound;

}

public static final numberChars readNumber(final JsonIterator iter) throws IOException {

int j = 0;

boolean dotFound = false;

for (; ; ) {

for (int i = iter.head; i < iter.tail; i++) {

if (j == iter.reusableChars.length) {

char[] newBuf = new char[iter.reusableChars.length * 2];

System.arraycopy(iter.reusableChars, 0, newBuf, 0, iter.reusableChars.length);

iter.reusableChars = newBuf;

}

byte c = iter.buf[i];

switch (c) {

case '.':

case 'e':

case 'E':

dotFound = true;

// fallthrough

case '-':

case '+':

case '0':

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

iter.reusableChars[j++] = (char) c;

break;

default:

iter.head = i;

numberChars numberChars = new numberChars();

numberChars.chars = iter.reusableChars;

numberChars.charsLength = j;

numberChars.dotFound = dotFound;

return numberChars;

}

if (!IterImpl.loadMore(iter)) {

iter.head = iter.tail;

numberChars numberChars = new numberChars();

numberChars.chars = iter.reusableChars;

numberChars.charsLength = j;

numberChars.dotFound = dotFound;

return numberChars;

}

static final double readDouble(final JsonIterator iter) throws IOException {

return readDoubleSlowPath(iter);

}

static final long readLong(final JsonIterator iter, final byte c) throws IOException {

long ind = IterImplNumber.intDigits[c];

if (ind == 0) {

assertNotLeadingZero(iter);

return 0;

}

if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {

throw iter.reportError("readLong", "expect 0~9");

}

return IterImplForStreaming.readLongSlowPath(iter, ind);

}

static final int readInt(final JsonIterator iter, final byte c) throws IOException {

int ind = IterImplNumber.intDigits[c];

if (ind == 0) {

assertNotLeadingZero(iter);

return 0;

}

if (ind == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {

throw iter.reportError("readInt", "expect 0~9");

}

return IterImplForStreaming.readIntSlowPath(iter, ind);

}

static void assertNotLeadingZero(JsonIterator iter) throws IOException {

try {

byte nextByte = iter.buf[iter.head];

int ind2 = IterImplNumber.intDigits[nextByte];

if (ind2 == IterImplNumber.INVALID_CHAR_FOR_NUMBER) {

return;

}

throw iter.reportError("assertNotLeadingZero", "leading zero is invalid");

} catch (ArrayIndexOutOfBoundsException e) {

iter.head = iter.tail;

return;

}

java/src/main/java/com/jsoniter/IterImplForStreaming.java at master · structure/java · GitHub

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