com.badlogic.gdx.utils.UBJsonReader Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.utils;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.utils.JsonWriter.OutputType;
/** Lightweight UBJSON parser.
*
* The default behavior is to parse the JSON into a DOM containing {@link JsonValue} objects. Extend this class and override
* methods to perform event driven parsing. When this is done, the parse methods will return null.
* @author Xoppa */
public class UBJsonReader implements BaseJsonReader {
public boolean oldFormat = true;
/** Parses the UBJSON from the given stream.
* For best performance you should provide buffered streams to this method! */
@Override
public JsonValue parse (InputStream input) {
DataInputStream din = null;
try {
din = new DataInputStream(input);
return parse(din);
} catch (IOException ex) {
throw new SerializationException(ex);
} finally {
StreamUtils.closeQuietly(din);
}
}
@Override
public JsonValue parse (FileHandle file) {
try {
return parse(file.read(8192));
} catch (Exception ex) {
throw new SerializationException("Error parsing file: " + file, ex);
}
}
public JsonValue parse (final DataInputStream din) throws IOException {
try {
return parse(din, din.readByte());
} finally {
StreamUtils.closeQuietly(din);
}
}
protected JsonValue parse (final DataInputStream din, final byte type) throws IOException {
if (type == '[')
return parseArray(din);
else if (type == '{')
return parseObject(din);
else if (type == 'Z')
return new JsonValue(JsonValue.ValueType.nullValue);
else if (type == 'T')
return new JsonValue(true);
else if (type == 'F')
return new JsonValue(false);
else if (type == 'B')
return new JsonValue((long)readUChar(din));
else if (type == 'U')
return new JsonValue((long)readUChar(din));
else if (type == 'i')
return new JsonValue(oldFormat ? (long)din.readShort() : (long)din.readByte());
else if (type == 'I')
return new JsonValue(oldFormat ? (long)din.readInt() : (long)din.readShort());
else if (type == 'l')
return new JsonValue((long)din.readInt());
else if (type == 'L')
return new JsonValue(din.readLong());
else if (type == 'd')
return new JsonValue(din.readFloat());
else if (type == 'D')
return new JsonValue(din.readDouble());
else if (type == 's' || type == 'S')
return new JsonValue(parseString(din, type));
else if (type == 'a' || type == 'A')
return parseData(din, type);
else if (type == 'C')
return new JsonValue(din.readChar());
else
throw new GdxRuntimeException("Unrecognized data type");
}
protected JsonValue parseArray (final DataInputStream din) throws IOException {
JsonValue result = new JsonValue(JsonValue.ValueType.array);
byte type = din.readByte();
byte valueType = 0;
if (type == '$') {
valueType = din.readByte();
type = din.readByte();
}
long size = -1;
if (type == '#') {
size = parseSize(din, false, -1);
if (size < 0) throw new GdxRuntimeException("Unrecognized data type");
if (size == 0) return result;
type = valueType == 0 ? din.readByte() : valueType;
}
JsonValue prev = null;
long c = 0;
while (din.available() > 0 && type != ']') {
final JsonValue val = parse(din, type);
val.parent = result;
if (prev != null) {
val.prev = prev;
prev.next = val;
result.size++;
} else {
result.child = val;
result.size = 1;
}
prev = val;
if (size > 0 && ++c >= size) break;
type = valueType == 0 ? din.readByte() : valueType;
}
return result;
}
protected JsonValue parseObject (final DataInputStream din) throws IOException {
JsonValue result = new JsonValue(JsonValue.ValueType.object);
byte type = din.readByte();
byte valueType = 0;
if (type == '$') {
valueType = din.readByte();
type = din.readByte();
}
long size = -1;
if (type == '#') {
size = parseSize(din, false, -1);
if (size < 0) throw new GdxRuntimeException("Unrecognized data type");
if (size == 0) return result;
type = din.readByte();
}
JsonValue prev = null;
long c = 0;
while (din.available() > 0 && type != '}') {
final String key = parseString(din, true, type);
final JsonValue child = parse(din, valueType == 0 ? din.readByte() : valueType);
child.setName(key);
child.parent = result;
if (prev != null) {
child.prev = prev;
prev.next = child;
result.size++;
} else {
result.child = child;
result.size = 1;
}
prev = child;
if (size > 0 && ++c >= size) break;
type = din.readByte();
}
return result;
}
protected JsonValue parseData (final DataInputStream din, final byte blockType) throws IOException {
// FIXME: a/A is currently not following the specs because it lacks strong typed, fixed sized containers,
// see: https://github.com/thebuzzmedia/universal-binary-json/issues/27
final byte dataType = din.readByte();
final long size = blockType == 'A' ? readUInt(din) : (long)readUChar(din);
final JsonValue result = new JsonValue(JsonValue.ValueType.array);
JsonValue prev = null;
for (long i = 0; i < size; i++) {
final JsonValue val = parse(din, dataType);
val.parent = result;
if (prev != null) {
prev.next = val;
result.size++;
} else {
result.child = val;
result.size = 1;
}
prev = val;
}
return result;
}
protected String parseString (final DataInputStream din, final byte type) throws IOException {
return parseString(din, false, type);
}
protected String parseString (final DataInputStream din, final boolean sOptional, final byte type) throws IOException {
long size = -1;
if (type == 'S') {
size = parseSize(din, true, -1);
} else if (type == 's')
size = (long)readUChar(din);
else if (sOptional) size = parseSize(din, type, false, -1);
if (size < 0) throw new GdxRuntimeException("Unrecognized data type, string expected");
return size > 0 ? readString(din, size) : "";
}
protected long parseSize (final DataInputStream din, final boolean useIntOnError, final long defaultValue) throws IOException {
return parseSize(din, din.readByte(), useIntOnError, defaultValue);
}
protected long parseSize (final DataInputStream din, final byte type, final boolean useIntOnError, final long defaultValue)
throws IOException {
if (type == 'i') return (long)readUChar(din);
if (type == 'I') return (long)readUShort(din);
if (type == 'l') return (long)readUInt(din);
if (type == 'L') return din.readLong();
if (useIntOnError) {
long result = (long)((short)type & 0xFF) << 24;
result |= (long)((short)din.readByte() & 0xFF) << 16;
result |= (long)((short)din.readByte() & 0xFF) << 8;
result |= (long)((short)din.readByte() & 0xFF);
return result;
}
return defaultValue;
}
protected short readUChar (final DataInputStream din) throws IOException {
return (short)((short)din.readByte() & 0xFF);
}
protected int readUShort (final DataInputStream din) throws IOException {
return ((int)din.readShort() & 0xFFFF);
}
protected long readUInt (final DataInputStream din) throws IOException {
return ((long)din.readInt() & 0xFFFFFFFF);
}
protected String readString (final DataInputStream din, final long size) throws IOException {
final byte data[] = new byte[(int)size];
din.readFully(data);
return new String(data, "UTF-8");
}
}
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