![]() ![]() ![]() Set noAssert to true to skip validation of value and offset. Note, value must be a valid unsigned 16 bit integer. Writes value to the buffer at the specified offset with specified endianįormat. noAssert Boolean, Optional, Default: false.So the legal range is between 0x00 and 0xFF hex or 0 and 255.Įxample: copy an ASCII string into a buffer, one byte at a time: str = "node.js" īuf.writeUInt16LE(value, offset) buf.writeUInt16BE(value, offset) buf.readUIntLE(offset, byteLength) buf.readUIntBE(offset, byteLength) buf.readIntLE(offset, byteLength) buf.readIntBE(offset, byteLength) encoding Bytes to be written to buffer.Class Method: Buffer.isEncoding(encoding) encoding String - encoding to use, Optional.Īllocates a new buffer containing the given str.Įncoding defaults to 'utf8'.new Buffer(buffer)Ĭopies the passed buffer data onto a new Buffer instance. new Buffer(array)Īllocates a new buffer using an array of octets. Use buf.fill(0)to initialize a buffer to zeroes. So the contents of a newly created Buffer is unknown. Unlike ArrayBuffers, the underlying memory for buffers new Buffer(size)Īllocates a new buffer of size octets. It can be constructed in a variety of ways. The Buffer class is a global type for dealing with binary data directly. ArrayBuffer#slice() makes a copy of the slice whileīuffer#slice() creates a view. While more efficient, it introduces subtle incompatibilities with the typedĪrrays specification. NOTE: Node.js v0.8 simply retained a reference to the buffer in array.buffer With elements, not a Uint32Array with a single element New Uint32Array(new Buffer()) creates a 4-element Uint32Array The buffer's memory is interpreted as an array, not a byte array. The buffer's memory is copied, not shared. 'hex' - Encode each byte as two hexadecimal characters.Ĭreating a typed array from a Buffer works with the following caveats: Will be removed in future versions of Node. Should be avoided in favor of Buffer objects where possible. 'binary' - A way of encoding raw binary data into strings by using only Surrogate pairs (U+10000 to U+10FFFF) are supported. 'utf16le' - 2 or 4 bytes, little endian encoded Unicode characters. 'utf8' - Multibyte encoded Unicode characters. The Buffer class is a global, making it very rare that one would needĬonverting between Buffers and JavaScript string objects requires an explicitĮncoding method. To an array of integers but corresponds to a raw memory allocation outside Raw data is stored in instances of the Buffer class. Node has several strategies for manipulating, creating, and Whenĭealing with TCP streams or the file system, it's necessary to handle octet const buf3 = Buffer.Pure JavaScript is Unicode friendly but not nice to binary data. This is faster than calling Buffer.alloc() but the returned // Buffer instance might contain old data that needs to be // overwritten using fill(), write(), or other functions that fill the Buffer's // contents. Creates an uninitialized buffer of length 10. Creates a Buffer of length 10, // filled with bytes which all have the value `1`. Creates a zero-filled Buffer of length 10. Recommended to explicitly reference it via an import or require statement. While the Buffer class is available within the global scope, it is still Plain Uint8Arrays wherever Buffers are supported as well. The Buffer class is a subclass of JavaScript's Uint8Array class andĮxtends it with methods that cover additional use cases. What makes Buffer.allocUnsafe() and Buffer.allocUnsafeSlow() "unsafe"?īuffer objects are used to represent a fixed-length sequence of bytes.The -zero-fill-buffers command-line option. ![]() om(), Buffer.alloc(), and Buffer.allocUnsafe().buf.writeUIntLE(value, offset, byteLength).buf.writeUIntBE(value, offset, byteLength).buf.writeIntLE(value, offset, byteLength).buf.writeIntBE(value, offset, byteLength).Static method: Buffer.isEncoding(encoding).Static method: Buffer.allocUnsafeSlow(size).Static method: Buffer.allocUnsafe(size). ![]()
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