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writer.js
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writer.js
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'use strict';
let ref = require('ref');
let util = require('./util');
let reader = require('./reader');
let assert = require('assert');
class BufferWriter {
constructor(buffer) {
this.buffer = new Buffer(buffer || 0);
this.position = this.buffer.length;
}
reallocate(newSize) {
let newBuffer = new Buffer(newSize);
this.buffer.copy(newBuffer, 0, 0, this.position);
this.buffer = newBuffer;
}
assureSpace(requiredSpace) {
let currentLength = this.buffer.length;
if(this.position + requiredSpace > currentLength) {
this.reallocate(Math.max(currentLength * 2 + 1, currentLength + requiredSpace));
}
}
get length() {
return this.position;
}
concat(buffer) {
this.assureSpace(buffer.length);
buffer.copy(this.buffer, this.position);
this.position += buffer.length;
}
getBuffer() {
return this.buffer.slice(0, this.position);
}
writeAscii(text) {
let buffer = new Buffer(text, 'ascii');
this.concat(buffer);
}
writeUtf8(text) {
let buffer = new Buffer(text, 'utf8');
this.concat(buffer);
}
writeByte(number) {
let buffer = new Buffer(1);
buffer.writeUInt8(number, 0);
this.concat(buffer);
}
writeInt32LE(number) {
let buffer = new Buffer(4);
buffer.writeInt32LE(number, 0);
this.concat(buffer);
}
writeUInt32LE(number) {
let buffer = new Buffer(4);
buffer.writeUInt32LE(number, 0);
this.concat(buffer);
}
writeFloatLE(number) {
let buffer = new Buffer(4);
buffer.writeFloatLE(number, 0);
this.concat(buffer);
}
write7BitEncodedNumber(number) {
do {
let byte = number & 127;
number = number >> 7;
if(number) byte |= 128;
this.writeByte(byte);
} while(number);
}
}
exports.BufferWriter = BufferWriter;
class DictionaryWriter {
constructor(keyType, valueType) {
this.keyType = keyType;
this.valueType = valueType;
}
write(buffer, dict, writerResolver) {
let count = Object.keys(dict).length;
buffer.writeInt32LE(count);
for(let key of Object.keys(dict)) {
let value = dict[key];
// Can't keep track of the key types in javascript without using
// another storage method.
writerResolver.write(buffer, {type: this.keyType, data: key});
writerResolver.write(buffer, value);
}
}
}
class ArrayWriter {
constructor(elementType) {
this.elementType = elementType;
}
write(buffer, array, writerResolver) {
buffer.writeInt32LE(array.length);
for(let i = 0; i < array.length; i++) {
writerResolver.write(buffer, array[i]);
}
}
}
class Texture2DWriter {
write(buffer, imageData, writerResolver) {
buffer.writeInt32LE(0);
buffer.writeUInt32LE(imageData.width);
buffer.writeUInt32LE(imageData.height);
buffer.writeUInt32LE(1);
if(!imageData.format) imageData.format = 0;
if(!imageData.shouldCompress) imageData.format = 0;
let data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
let alpha = data[i + 3] / 255;
data[i] = Math.floor(data[i] * alpha);
data[i + 1] = Math.floor(data[i + 1] * alpha);
data[i + 2] = Math.floor(data[i + 2] * alpha);
}
let dxt = require('dxt');
if(imageData.format == 3) {
data = dxt.compress(data, width, height, dxt.kDxt1);
} else if(imageData.format == 4) {
data = dxt.compress(data, width, height, dxt.kDxt3);
} else if(imageData.format == 5) {
data = dxt.compress(data, width, height, dxt.kDxt5);
}
buffer.writeUInt32LE(data.length);
buffer.concat(data);
}
}
class SpriteFontWriter {
write(buffer, fontData, writerResolver) {
writerResolver.write(buffer, fontData.texture);
writerResolver.write(buffer, fontData.glyphs);
writerResolver.write(buffer, fontData.cropping);
writerResolver.write(buffer, fontData.characterMap);
buffer.writeInt32LE(fontData.verticalSpacing);
buffer.writeFloatLE(fontData.horizontalSpacing);
writerResolver.write(buffer, fontData.kerning);
let defaultCharacter = fontData.defaultCharacter.data;
let booleanWriter = new BooleanWriter();
if(defaultCharacter.data != null) {
booleanWriter.write(buffer, true, writerResolver);
let charWriter = new CharWriter();
charWriter.write(buffer, defaultCharacter.data.data, writerResolver);
} else {
booleanWriter.write(buffer, false, writerResolver);
}
}
}
class TBinWriter {
write(buffer, tBinData, writerResolver) {
buffer.writeInt32LE(tBinData.data.length);
buffer.concat(tBinData.data);
}
}
class Vector3Writer {
write(buffer, vector, writerResolver) {
buffer.writeFloatLE(vector.x);
buffer.writeFloatLE(vector.y);
buffer.writeFloatLE(vector.z);
}
}
class CharWriter {
write(buffer, char, writerResolver) {
assert.equal(char.length, 1);
let charBuffer = new Buffer(4);
let size = charBuffer.write(char);
buffer.concat(charBuffer.slice(0, size));
}
}
class StringWriter {
write(buffer, text, writerResolver) {
// Multiply by 4 to guarantee no sequence of characters
// will be truncated, as javascript returns the utf-8 length,
// and each utf-8 character may occupy up to 4 bytes.
let stringBuffer = new Buffer(text.length * 4);
let size = stringBuffer.write(text);
buffer.write7BitEncodedNumber(size);
buffer.concat(stringBuffer.slice(0, size));
}
}
exports.StringWriter = StringWriter;
class RectangleWriter {
write(buffer, rectangle, writerResolver) {
buffer.writeInt32LE(rectangle.x);
buffer.writeInt32LE(rectangle.y);
buffer.writeInt32LE(rectangle.width);
buffer.writeInt32LE(rectangle.height);
}
}
class Int32Writer {
write(buffer, number, writerResolver) {
buffer.writeInt32LE(Number(number));
}
}
class BooleanWriter {
write(buffer, boolean, writerResolver) {
buffer.writeByte(Boolean(boolean) ? 1 : 0);
}
}
class WriterResolver {
constructor(readers) {
this.readerData = {};
for(let i = 0; i < readers.length; i++) {
let readerType = readers[i].type;
let simpleType = util.simplifyType(readerType);
this.readerData[simpleType] = {
writer: getWriter(simpleType),
valueType: reader.getReader(simpleType).isValueType(),
index: i
};
}
}
write(buffer, value) {
let readerData = this.readerData[value.type];
if(!readerData.valueType) {
buffer.write7BitEncodedNumber(readerData.index + 1);
}
readerData.writer.write(buffer, value.data, this);
}
}
exports.WriterResolver = WriterResolver;
function getWriter(type) {
let typeInfo = util.getTypeInfo(type);
switch(typeInfo.type) {
case 'Dictionary':
return new DictionaryWriter(typeInfo.subtypes[0], typeInfo.subtypes[1]);
case 'Array':
case 'List':
return new ArrayWriter(typeInfo.subtypes[0]);
case 'Texture2D':
return new Texture2DWriter();
case 'Vector3':
return new Vector3Writer();
case 'String':
return new StringWriter();
case 'Int32':
return new Int32Writer();
case 'Char':
return new CharWriter();
case 'Boolean':
return new BooleanWriter();
case 'SpriteFont':
return new SpriteFontWriter();
case 'Rectangle':
return new RectangleWriter();
case 'TBin':
return new TBinWriter();
default:
throw new util.ReadError('Non-implemented file writer for "' + type + '"');
}
}