diff options
Diffstat (limited to 'deps/npm/node_modules/npm-registry-fetch/node_modules/smart-buffer/lib/smart-buffer.js')
| -rw-r--r-- | deps/npm/node_modules/npm-registry-fetch/node_modules/smart-buffer/lib/smart-buffer.js | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/deps/npm/node_modules/npm-registry-fetch/node_modules/smart-buffer/lib/smart-buffer.js b/deps/npm/node_modules/npm-registry-fetch/node_modules/smart-buffer/lib/smart-buffer.js new file mode 100644 index 0000000000..ea69cfc09a --- /dev/null +++ b/deps/npm/node_modules/npm-registry-fetch/node_modules/smart-buffer/lib/smart-buffer.js @@ -0,0 +1,371 @@ +var SmartBuffer = (function () { + + /** + * Constructor for SmartBuffer. + * @param arg1 {Buffer || Number || String} Buffer to read from, or expected size to write to, or encoding to use. + * @param arg2 {String} Encoding to use for writing and reading strings. Defaults to utf8. If encoding is given in arg1, this is ignored. + * @constructor + * + * There are a few ways to construct a SmartBuffer: + * + * SmartBuffer() - Defaults to utf8, 4096 pre-set internal Buffer length. + * SmartBuffer(size) - Defaults to utf8, sets internal Buffer length to the size given. + * SmartBuffer(encoding) - Sets the given encoding, defaults to 4096 pre-set internal Buffer length. + * SmartBuffer(Buffer) - Defaults to utf8, sets the internal Buffer to the given buffer (same memory). + * SmartBuffer(Buffer, encoding) - Sets the given encoding, sets the internal Buffer to the given buffer (same memory). + * + */ + function SmartBuffer(arg1, arg2) { + var type; + switch (type = typeof arg1) { + case 'number': + if (isFinite(arg1) && arg1 > 0) { + this.buff = new Buffer(Math.ceil(arg1)); + this.length = 0; + } else { + throw new Error('When specifying a size, it must be a valid number above zero.'); + } + break; + + case 'string': + if (Buffer.isEncoding(arg1)) { + this.buff = new Buffer(4096); + this.length = 0; + this.encoding = arg1; + } else { + throw new Error('Invalid Encoding'); + } + break; + + case 'object': + if (Buffer.isBuffer(arg1)) { + this.buff = arg1; + this.length = arg1.length; + } else { + throw new TypeError('First argument must be a Buffer, Number representing the size, or a String representing the encoding.'); + } + break; + + default: + this.buff = new Buffer(4096); + this.length = 0; + break; + } + + if (typeof this.encoding === 'undefined') { + if (typeof arg2 === 'string') { + if (Buffer.isEncoding(arg2)) { + this.encoding = arg2; + } else { + throw new Error('Invalid Encoding'); + } + } + } + + this._readOffset = 0; + this._writeOffset = 0; + } + + + SmartBuffer.prototype._ensureWritable = function (len, offset) { + this._ensureCapacity(this.length + len + (typeof offset === 'number' ? offset : 0)); + + if (typeof offset === 'number') { + this.buff.copy(this.buff, offset + len, offset, this.buff.length); + } + this.length = Math.max(this.length + len, (typeof offset === 'number' ? offset : 0) + len); + }; + + SmartBuffer.prototype._ensureCapacity = function (minlen) { + var oldlen = this.buff.length; + + if (minlen > oldlen) { + var data = this.buff; + var newlen = (oldlen * 3) / 2 + 1; + if (newlen < minlen) + newlen = minlen; + this.buff = new Buffer(newlen); + data.copy(this.buff, 0, 0, oldlen); + } + }; + + + var makeReader = function (func, size) { + return function () { + var ret = func.call(this.buff, this._readOffset); + this._readOffset += size; + return ret; + } + }; + + var makeWriter = function (func, size) { + return function (value, offset) { + this._ensureWritable(size, offset); + func.call(this.buff, value, typeof offset === 'number' ? offset : this._writeOffset); + this._writeOffset += size; + return this; + } + }; + + + /* + Read Operations + */ + + SmartBuffer.prototype.readInt8 = makeReader(Buffer.prototype.readInt8, 1); + SmartBuffer.prototype.readInt16BE = makeReader(Buffer.prototype.readInt16BE, 2); + SmartBuffer.prototype.readInt16LE = makeReader(Buffer.prototype.readInt16LE, 2); + SmartBuffer.prototype.readInt32BE = makeReader(Buffer.prototype.readInt32BE, 4); + SmartBuffer.prototype.readInt32LE = makeReader(Buffer.prototype.readInt32LE, 4); + + SmartBuffer.prototype.readUInt8 = makeReader(Buffer.prototype.readUInt8, 1); + SmartBuffer.prototype.readUInt16BE = makeReader(Buffer.prototype.readUInt16BE, 2); + SmartBuffer.prototype.readUInt16LE = makeReader(Buffer.prototype.readUInt16LE, 2); + SmartBuffer.prototype.readUInt32BE = makeReader(Buffer.prototype.readUInt32BE, 4); + SmartBuffer.prototype.readUInt32LE = makeReader(Buffer.prototype.readUInt32LE, 4); + + SmartBuffer.prototype.readFloatBE = makeReader(Buffer.prototype.readFloatBE, 4); + SmartBuffer.prototype.readFloatLE = makeReader(Buffer.prototype.readFloatLE, 4); + + SmartBuffer.prototype.readDoubleBE = makeReader(Buffer.prototype.readDoubleBE, 8); + SmartBuffer.prototype.readDoubleLE = makeReader(Buffer.prototype.readDoubleLE, 8); + + + /** + * Reads a string of the given length. + * @param length {Number} The length of the string to read. (Defaults to the length of the remaining data) + * @param encoding {String} The encoding to use. (Defaults to encoding set in constructor, or utf8) + * @returns {string} The string. + */ + SmartBuffer.prototype.readString = function (length, encoding) { + var len = Math.min(length, this.length - this._readOffset) || (this.length - this._readOffset); + var ret = this.buff.slice(this._readOffset, this._readOffset + len).toString(encoding || this.encoding); + this._readOffset += len; + return ret; + }; + + /** + * Reads a null terminated string from the underlying buffer. + * @param encoding {String} Encoding to use. Defaults to encoding set in constructor, or utf8. + * @returns {string} + */ + SmartBuffer.prototype.readStringNT = function (encoding) { + var nullpos = this.length; + for (var i = this._readOffset; i < this.length; i++) { + if (this.buff[i] == 0x00) { + nullpos = i; + break; + } + } + + var result = this.buff.slice(this._readOffset, nullpos); + this._readOffset = nullpos + 1; + + return result.toString(encoding || this.encoding); + }; + + + /** + * Reads a specified number of bytes. + * @param len {Number} Numbers of bytes to read. (Defaults to the remaining data length) + * @returns {Buffer} Buffer containing the read bytes. + */ + SmartBuffer.prototype.readBuffer = function (len) { + var endpoint = Math.min(this.length, this._readOffset + (typeof len === 'number' ? len : this.length)); + var ret = this.buff.slice(this._readOffset, endpoint); + this._readOffset = endpoint; + return ret; + }; + + /** + * Reads a null terminated sequence of bytes from the underlying buffer. + * @returns {Buffer} Buffer containing the read bytes. + */ + SmartBuffer.prototype.readBufferNT = function () { + var nullpos = this.length; + for (var i = this._readOffset; i < this.length; i++) { + if (this.buff[i] == 0x00) { + nullpos = i; + break; + } + } + + var ret = this.buff.slice(this._readOffset, nullpos); + this._readOffset = nullpos + 1; + + return ret; + }; + + + /* + Write Operations + */ + + + SmartBuffer.prototype.writeInt8 = makeWriter(Buffer.prototype.writeInt8, 1); + SmartBuffer.prototype.writeInt16BE = makeWriter(Buffer.prototype.writeInt16BE, 2); + SmartBuffer.prototype.writeInt16LE = makeWriter(Buffer.prototype.writeInt16LE, 2); + SmartBuffer.prototype.writeInt32BE = makeWriter(Buffer.prototype.writeInt32BE, 4); + SmartBuffer.prototype.writeInt32LE = makeWriter(Buffer.prototype.writeInt32LE, 4); + + SmartBuffer.prototype.writeUInt8 = makeWriter(Buffer.prototype.writeUInt8, 1); + SmartBuffer.prototype.writeUInt16BE = makeWriter(Buffer.prototype.writeUInt16BE, 2); + SmartBuffer.prototype.writeUInt16LE = makeWriter(Buffer.prototype.writeUInt16LE, 2); + SmartBuffer.prototype.writeUInt32BE = makeWriter(Buffer.prototype.writeUInt32BE, 4); + SmartBuffer.prototype.writeUInt32LE = makeWriter(Buffer.prototype.writeUInt32LE, 4); + + SmartBuffer.prototype.writeFloatBE = makeWriter(Buffer.prototype.writeFloatBE, 4); + SmartBuffer.prototype.writeFloatLE = makeWriter(Buffer.prototype.writeFloatLE, 4); + + SmartBuffer.prototype.writeDoubleBE = makeWriter(Buffer.prototype.writeDoubleBE, 8); + SmartBuffer.prototype.writeDoubleLE = makeWriter(Buffer.prototype.writeDoubleLE, 8); + + + /** + * Writes a string to the underlying buffer. + * @param value {String} The string to write. + * @param offset {Number} The offset to write the string to. (Encoding can also be set here in place of offset) + * @param encoding {String} The encoding to use. (Defaults to encoding set in constructor, or to utf8) + * @returns {*} + */ + SmartBuffer.prototype.writeString = function (value, offset, encoding) { + var len, _offset, type = typeof offset; + + if (type === 'number') { + _offset = offset; + } else if (type === 'string') { + encoding = offset; + offset = this._writeOffset; + } else { + encoding = undefined; + offset = this._writeOffset; + } + + len = Buffer.byteLength(value, encoding || this.encoding); + this._ensureWritable(len, _offset); + + this.buff.write(value, offset, len, encoding || this.encoding); + this._writeOffset += len; + return this; + }; + + /** + * Writes a null terminated string to the underlying buffer. + * @param value {String} The string to write. + * @param offset {Number} The offset to write the string to. (Encoding can also be set here in place of offset) + * @param encoding {String} The encoding to use. (Defaults to encoding set in constructor, or to utf8) + * @returns {*} + */ + SmartBuffer.prototype.writeStringNT = function (value, offset, encoding) { + this.writeString(value, offset, encoding); + this.writeUInt8(0x00, (typeof offset === 'number' ? offset + value.length : this._writeOffset)); + return this; + }; + + /** + * Writes a Buffer to the underlying buffer. + * @param value {Buffer} The buffer to write. + * @param offset {Number} The offset to write the Buffer to. + * @returns {*} + */ + SmartBuffer.prototype.writeBuffer = function (value, offset) { + var len = value.length; + this._ensureWritable(len, offset); + value.copy(this.buff, typeof offset === 'number' ? offset : this._writeOffset); + this._writeOffset += len; + return this; + }; + + /** + * Writes a null terminated Buffer to the underlying buffer. + * @param value {Buffer} The buffer to write. + * @param offset {Number} The offset to write the Buffer to. + * @returns {*} + */ + SmartBuffer.prototype.writeBufferNT = function (value, offset) { + this.writeBuffer(value, offset); + this.writeUInt8(0x00, (typeof offset === 'number' ? offset + value.length : this._writeOffset)); + + return this; + }; + + + /** + * Resets the Endless Buffer. + */ + SmartBuffer.prototype.clear = function () { + this._writeOffset = 0; + this._readOffset = 0; + this.length = 0; + }; + + /** + * Gets the remaining number of bytes to be read from the existing Buffer. + * @returns {number} The number of bytes remaining. + */ + SmartBuffer.prototype.remaining = function () { + return this.length - this._readOffset; + }; + + /** + * Skips the read position forward by the amount of given. + * @param amount {Number} The amount of bytes to skip forward. + */ + SmartBuffer.prototype.skip = function (amount) { + if (this._readOffset + amount > this.length) + throw new Error('Target position is beyond the bounds of the data.'); + + this._readOffset += amount; + }; + + /** + * Rewinds the read position backward by the amount given. + * @param amount {Number} The amount of bytes to reverse backward. + */ + SmartBuffer.prototype.rewind = function (amount) { + if (this._readOffset - amount < 0) + throw new Error('Target position is beyond the bounds of the data.'); + + this._readOffset -= amount; + }; + + /** + * Skips the read position to the given position. + * @param position {Number} The position to skip to. + */ + SmartBuffer.prototype.skipTo = function (position) { + if (position < 0 || position > this.length) + throw new Error('Target position is beyond the bounds of the data.'); + + this._readOffset = position; + }; + + /** + * Gets the underlying Buffer. + * @returns {*} + */ + SmartBuffer.prototype.toBuffer = function () { + return this.buff.slice(0, this.length); + }; + + /** + * Gets a string representation of the underlying Buffer. + * @param encoding {String} Encoding to use. (Defaults to encoding set in constructor, or utf8.) + * @returns {*} + */ + SmartBuffer.prototype.toString = function (encoding) { + return this.buff.toString(encoding || this.encoding, 0, this.length); + }; + + /** + * Destroys the underlying Buffer, and resets the SmartBuffer. + */ + SmartBuffer.prototype.destroy = function () { + delete this.buff; + this.clear(); + }; + + return SmartBuffer; +})(); + +module.exports = SmartBuffer;
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