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Просмотр файла: smartbuffer.js
"use strict";
// The default Buffer size if one is not provided.
const DEFAULT_SMARTBUFFER_SIZE = 4096;
// The default string encoding to use for reading/writing strings.
const DEFAULT_SMARTBUFFER_ENCODING = 'utf8';
class SmartBuffer {
/**
* Creates a new SmartBuffer instance.
*
* @param arg1 { Number | BufferEncoding | Buffer | SmartBufferOptions }
* @param arg2 { BufferEncoding }
*/
constructor(arg1, arg2) {
this.length = 0;
this.encoding = DEFAULT_SMARTBUFFER_ENCODING;
this.writeOffset = 0;
this.readOffset = 0;
// Initial buffer size provided
if (typeof arg1 === 'number') {
if (Number.isFinite(arg1) && Number.isInteger(arg1) && arg1 > 0) {
this.buff = Buffer.allocUnsafe(arg1);
}
else {
throw new Error('Invalid size provided. Size must be a valid integer greater than zero.');
}
}
else if (typeof arg1 === 'string') {
if (Buffer.isEncoding(arg1)) {
this.buff = Buffer.allocUnsafe(DEFAULT_SMARTBUFFER_SIZE);
this.encoding = arg1;
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
else if (arg1 instanceof Buffer) {
this.buff = arg1;
this.length = arg1.length;
}
else if (SmartBuffer.isSmartBufferOptions(arg1)) {
// Checks for encoding
if (arg1.encoding) {
if (Buffer.isEncoding(arg1.encoding)) {
this.encoding = arg1.encoding;
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
// Checks for initial size length
if (arg1.size) {
if (Number.isFinite(arg1.size) && Number.isInteger(arg1.size) && arg1.size > 0) {
this.buff = Buffer.allocUnsafe(arg1.size);
}
else {
throw new Error('Invalid size provided. Size must be a valid integer greater than zero.');
}
}
else if (arg1.buff) {
if (arg1.buff instanceof Buffer) {
this.buff = arg1.buff;
this.length = arg1.buff.length;
}
else {
throw new Error('Invalid buffer provided in SmartBufferOptions.');
}
}
else {
this.buff = Buffer.allocUnsafe(DEFAULT_SMARTBUFFER_SIZE);
}
}
else if (typeof arg1 === 'object') {
throw new Error('Invalid object supplied to SmartBuffer constructor.');
}
else {
this.buff = Buffer.allocUnsafe(DEFAULT_SMARTBUFFER_SIZE);
}
// Check for encoding (Buffer, Encoding) constructor.
if (typeof arg2 === 'string') {
if (Buffer.isEncoding(arg2)) {
this.encoding = arg2;
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
}
/**
* Creates a new SmartBuffer instance with the provided internal Buffer size and optional encoding.
*
* @param size { Number } The size of the internal Buffer.
* @param encoding { String } The BufferEncoding to use for strings.
*
* @return { SmartBuffer }
*/
static fromSize(size, encoding) {
return new this({
size: size,
encoding: encoding
});
}
/**
* Creates a new SmartBuffer instance with the provided Buffer and optional encoding.
*
* @param buffer { Buffer } The Buffer to use as the internal Buffer value.
* @param encoding { String } The BufferEncoding to use for strings.
*
* @return { SmartBuffer }
*/
static fromBuffer(buff, encoding) {
return new this({
buff: buff,
encoding: encoding
});
}
/**
* Creates a new SmartBuffer instance with the provided SmartBufferOptions options.
*
* @param options { SmartBufferOptions } The options to use when creating the SmartBuffer instance.
*/
static fromOptions(options) {
return new this(options);
}
/**
* Ensures that the internal Buffer is large enough to write data.
*
* @param minLength { Number } The minimum length of the data that needs to be written.
* @param offset { Number } The offset of the data to be written.
*/
ensureWriteable(minLength, offset) {
const offsetVal = typeof offset === 'number' ? offset : 0;
// Ensure there is enough internal Buffer capacity.
this.ensureCapacity(this.length + minLength + offsetVal);
// If offset is provided, copy data into appropriate location in regards to the offset.
if (typeof offset === 'number') {
this.buff.copy(this.buff, offsetVal + minLength, offsetVal, this.buff.length);
}
// Adjust instance length.
this.length = Math.max(this.length + minLength, offsetVal + minLength);
}
/**
* Ensures that the internal Buffer is large enough to write at least the given amount of data.
*
* @param minLength { Number } The minimum length of the data needs to be written.
*/
ensureCapacity(minLength) {
const oldLength = this.buff.length;
if (minLength > oldLength) {
let data = this.buff;
let newLength = (oldLength * 3) / 2 + 1;
if (newLength < minLength) {
newLength = minLength;
}
this.buff = Buffer.allocUnsafe(newLength);
data.copy(this.buff, 0, 0, oldLength);
}
}
/**
* Reads a numeric number value using the provided function.
*
* @param func { Function(offset: number) => number } The function to read data on the internal Buffer with.
* @param byteSize { Number } The number of bytes read.
*
* @param { Number }
*/
readNumberValue(func, byteSize) {
// Call Buffer.readXXXX();
const value = func.call(this.buff, this.readOffset);
// Adjust internal read offset
this.readOffset += byteSize;
return value;
}
/**
* Writes a numeric number value using the provided function.
*
* @param func { Function(offset: number, offset?) => number} The function to write data on the internal Buffer with.
* @param byteSize { Number } The number of bytes written.
* @param value { Number } The number value to write.
* @param offset { Number } the offset to write the number at.
*
*/
writeNumberValue(func, byteSize, value, offset) {
const offsetVal = typeof offset === 'number' ? offset : this.writeOffset;
// Ensure there is enough internal Buffer capacity. (raw offset is passed)
this.ensureWriteable(byteSize, offset);
// Call buffer.writeXXXX();
func.call(this.buff, value, offsetVal);
// Adjusts internal write offset
this.writeOffset += byteSize;
}
// Signed integers
/**
* Reads an Int8 value from the current read position.
*
* @return { Number }
*/
readInt8() {
return this.readNumberValue(Buffer.prototype.readUInt8, 1);
}
/**
* Reads an Int16BE value from the current read position.
*
* @return { Number }
*/
readInt16BE() {
return this.readNumberValue(Buffer.prototype.readUInt16BE, 2);
}
/**
* Reads an Int16LE value from the current read position.
*
* @return { Number }
*/
readInt16LE() {
return this.readNumberValue(Buffer.prototype.readUInt16LE, 2);
}
/**
* Reads an Int32BE value from the current read position.
*
* @return { Number }
*/
readInt32BE() {
return this.readNumberValue(Buffer.prototype.readUInt32BE, 4);
}
/**
* Reads an Int32LE value from the current read position.
*
* @return { Number }
*/
readInt32LE() {
return this.readNumberValue(Buffer.prototype.readUInt32LE, 4);
}
/**
* Writes an Int8 value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeInt8(value, offset) {
this.writeNumberValue(Buffer.prototype.writeInt8, 1, value, offset);
return this;
}
/**
* Writes an Int16BE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeInt16BE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeInt16BE, 2, value, offset);
return this;
}
/**
* Writes an Int16LE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeInt16LE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeInt16LE, 2, value, offset);
return this;
}
/**
* Writes an Int32BE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeInt32BE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeInt32BE, 4, value, offset);
return this;
}
/**
* Writes an Int32LE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeInt32LE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeInt32LE, 4, value, offset);
return this;
}
// Unsigned Integers
/**
* Reads an UInt8 value from the current read position.
*
* @return { Number }
*/
readUInt8() {
return this.readNumberValue(Buffer.prototype.readUInt8, 1);
}
/**
* Reads an UInt16BE value from the current read position.
*
* @return { Number }
*/
readUInt16BE() {
return this.readNumberValue(Buffer.prototype.readUInt16BE, 2);
}
/**
* Reads an UInt16LE value from the current read position.
*
* @return { Number }
*/
readUInt16LE() {
return this.readNumberValue(Buffer.prototype.readUInt16LE, 2);
}
/**
* Reads an UInt32BE value from the current read position.
*
* @return { Number }
*/
readUInt32BE() {
return this.readNumberValue(Buffer.prototype.readUInt32BE, 4);
}
/**
* Reads an UInt32LE value from the current read position.
*
* @return { Number }
*/
readUInt32LE() {
return this.readNumberValue(Buffer.prototype.readUInt32LE, 4);
}
/**
* Writes an UInt8 value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeUInt8(value, offset) {
this.writeNumberValue(Buffer.prototype.writeUInt8, 1, value, offset);
return this;
}
/**
* Writes an UInt16BE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeUInt16BE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeUInt16BE, 2, value, offset);
return this;
}
/**
* Writes an UInt16LE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeUInt16LE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeUInt16LE, 2, value, offset);
return this;
}
/**
* Writes an UInt32BE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeUInt32BE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeUInt32BE, 4, value, offset);
return this;
}
/**
* Writes an UInt32LE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeUInt32LE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeUInt32LE, 4, value, offset);
return this;
}
// Floating Point
/**
* Reads an FloatBE value from the current read position.
*
* @return { Number }
*/
readFloatBE() {
return this.readNumberValue(Buffer.prototype.readFloatBE, 4);
}
/**
* Reads an FloatLE value from the current read position.
*
* @return { Number }
*/
readFloatLE() {
return this.readNumberValue(Buffer.prototype.readFloatLE, 4);
}
/**
* Writes a FloatBE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeFloatBE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeFloatBE, 4, value, offset);
return this;
}
/**
* Writes a FloatLE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeFloatLE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeFloatLE, 4, value, offset);
return this;
}
// Double Floating Point
/**
* Reads an DoublEBE value from the current read position.
*
* @return { Number }
*/
readDoubleBE() {
return this.readNumberValue(Buffer.prototype.readDoubleBE, 8);
}
/**
* Reads an DoubleLE value from the current read position.
*
* @return { Number }
*/
readDoubleLE() {
return this.readNumberValue(Buffer.prototype.readDoubleLE, 8);
}
/**
* Writes a DoubleBE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeDoubleBE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeDoubleBE, 8, value, offset);
return this;
}
/**
* Writes a DoubleLE value to the current write position (or at optional offset).
*
* @param value { Number } The value to write.
* @param offset { Number } The offset to write the value at.
*
* @return this
*/
writeDoubleLE(value, offset) {
this.writeNumberValue(Buffer.prototype.writeDoubleLE, 8, value, offset);
return this;
}
// Strings
/**
* Reads a String from the current read position.
*
* @param length { Number } The number of bytes to read as a String.
* @param encoding { String } The BufferEncoding to use for the string (Defaults to instance level encoding).
*
* @return { String }
*/
readString(length, encoding) {
const lengthVal = Math.min(length, this.length - this.readOffset) || this.length - this.readOffset;
const value = this.buff.slice(this.readOffset, this.readOffset + lengthVal).toString(encoding || this.encoding);
this.readOffset += lengthVal;
return value;
}
/**
* Writes a String to the current write position.
*
* @param value { String } The String value to write.
* @param arg2 { Number | String } The offset to write the string to, or the BufferEncoding to use.
* @param encoding { String } The BufferEncoding to use for writing strings (defaults to instance encoding).
*/
writeString(value, arg2, encoding) {
let offsetVal = this.writeOffset;
let encodingVal = this.encoding;
// Check for offset
if (typeof arg2 === 'number') {
offsetVal = arg2;
}
else if (typeof arg2 === 'string') {
if (Buffer.isEncoding(arg2)) {
encodingVal = arg2;
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
// Check for encoding (third param)
if (typeof encoding === 'string') {
if (Buffer.isEncoding(encoding)) {
encodingVal = encoding;
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
// Calculate bytelength of string.
const byteLength = Buffer.byteLength(value, encodingVal);
// Ensure there is enough internal Buffer capacity.
this.ensureWriteable(byteLength, offsetVal);
// Write value
this.buff.write(value, offsetVal, byteLength, encodingVal);
// Increment internal Buffer write offset;
this.writeOffset += byteLength;
return this;
}
/**
* Reads a null-terminated String from the current read position.
*
* @param encoding { String } The BufferEncoding to use for the string (Defaults to instance level encoding).
*
* @return { String }
*/
readStringNT(encoding) {
// Set null character position to the end SmartBuffer instance.
let nullPos = this.length;
// Find next null character (if one is not found, default from above is used)
for (let i = this.readOffset; i < this.length; i++) {
if (this.buff[i] === 0x00) {
nullPos = i;
break;
}
}
// Read string value
const value = this.buff.slice(this.readOffset, nullPos);
// Increment internal Buffer read offset
this.readOffset = nullPos + 1;
return value.toString(encoding || this.encoding);
}
/**
* Writes a null-terminated String to the current write position.
*
* @param value { String } The String value to write.
* @param arg2 { Number | String } The offset to write the string to, or the BufferEncoding to use.
* @param encoding { String } The BufferEncoding to use for writing strings (defaults to instance encoding).
*/
writeStringNT(value, offset, encoding) {
// Write Values
this.writeString(value, offset, encoding);
this.writeUInt8(0x00, (typeof offset === 'number' ? offset + value.length : this.writeOffset));
}
// Buffers
/**
* Reads a Buffer from the internal read position.
*
* @param length { Number } The length of data to read as a Buffer.
*
* @return { Buffer }
*/
readBuffer(length) {
const lengthVal = typeof length === 'number' ? length : this.length;
const endPoint = Math.min(this.length, this.readOffset + lengthVal);
// Read buffer value
const value = this.buff.slice(this.readOffset, endPoint);
// Increment internal Buffer read offset
this.readOffset = endPoint;
return value;
}
/**
* Writes a Buffer to the current write position.
*
* @param value { Buffer } The Buffer to write.
* @param offset { Number } The offset to write the Buffer to.
*/
writeBuffer(value, offset) {
const offsetVal = typeof offset === 'number' ? offset : this.writeOffset;
// Ensure there is enough internal Buffer capacity.
this.ensureWriteable(value.length, offsetVal);
// Write buffer value
value.copy(this.buff, offsetVal);
// Increment internal Buffer write offset
this.writeOffset += value.length;
return this;
}
/**
* Reads a null-terminated Buffer from the current read poisiton.
*
* @return { Buffer }
*/
readBufferNT() {
// Set null character position to the end SmartBuffer instance.
let nullPos = this.length;
// Find next null character (if one is not found, default from above is used)
for (let i = this.readOffset; i < this.length; i++) {
if (this.buff[i] === 0x00) {
nullPos = i;
break;
}
}
// Read value
const value = this.buff.slice(this.readOffset, nullPos);
// Increment internal Buffer read offset
this.readOffset = nullPos + 1;
return value;
}
/**
* Writes a null-terminated Buffer to the current write position.
*
* @param value { Buffer } The Buffer to write.
* @param offset { Number } The offset to write the Buffer to.
*/
writeBufferNT(value, offset) {
// Write Values
this.writeBuffer(value, offset);
this.writeUInt8(0, (typeof offset === 'number' ? offset + value.length : this.writeOffset));
return this;
}
/**
* Clears the SmartBuffer instance to its original empty state.
*/
clear() {
this.writeOffset = 0;
this.readOffset = 0;
this.length = 0;
}
/**
* Gets the remaining data left to be read from the SmartBuffer instance.
*
* @return { Number }
*/
remaining() {
return this.length - this.readOffset;
}
/**
* Moves the read offset forward.
*
* @param amount { Number } The amount to move the read offset forward by.
*/
skip(amount) {
if (this.readOffset + amount > this.length) {
throw new Error('Target position is beyond the bounds of the SmartBuffer size.');
}
this.readOffset += amount;
}
/**
* Moves the read offset backwards.
*
* @param amount { Number } The amount to move the read offset backwards by.
*/
rewind(amount) {
if (this.readOffset - amount < 0) {
throw new Error('Target position is beyond the bounds of the SmartBuffer size.');
}
this.readOffset -= amount;
}
/**
* Moves the read offset to a specific position.
*
* @param position { Number } The position to move the read offset to.
*/
skipTo(position) {
this.moveTo(position);
}
/**
* Moves the read offset to a specific position.
*
* @param position { Number } The position to move the read offset to.
*/
moveTo(position) {
if (position > this.length) {
throw new Error('Target position is beyond the bounds of the SmartBuffer size.');
}
this.readOffset = position;
}
/**
* Gets the value of the internal managed Buffer
*
* @param { Buffer }
*/
toBuffer() {
return this.buff.slice(0, this.length);
}
/**
* Gets the String value of the internal managed Buffer
*
* @param encoding { String } The BufferEncoding to display the Buffer as (defaults to instance level encoding).
*/
toString(encoding) {
const encodingVal = typeof encoding === 'string' ? encoding : this.encoding;
if (Buffer.isEncoding(encodingVal)) {
return this.buff.toString(encodingVal, 0, this.length);
}
else {
throw new Error('Invalid encoding provided. Please specify a valid encoding the internal Node.js Buffer supports.');
}
}
/**
* Destroys the SmartBuffer instance.
*/
destroy() {
this.clear();
}
/**
* Type checking function that determines if an object is a SmartBufferOptions object.
*/
static isSmartBufferOptions(options) {
const castOptions = options;
return castOptions && (castOptions.encoding !== undefined || castOptions.size !== undefined || castOptions.buff !== undefined);
}
}
module.exports = SmartBuffer;
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