BufferWriter
scrypt-ts-opcat / encoding / BufferWriter
Class: BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:14
BufferWriter is a utility class for efficiently writing and concatenating buffers. It provides methods for writing various numeric types in both little-endian and big-endian formats, as well as variable-length integers (varints). The class maintains an internal array of buffers and can efficiently concatenate them into a single buffer when needed.
Example
const writer = new BufferWriter();
writer.writeUInt32LE(1234).writeUInt16BE(5678);
const result = writer.toBuffer();
Constructors
new BufferWriter()
new BufferWriter(
obj?):BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:26
Initializes a new BufferWriter instance.
Parameters
obj?
any
Optional object to set initial buffer content. If not provided, creates an empty buffer writer with empty buffers array and length 0.
Returns
Properties
buffers
buffers:
any[]
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:27
length
length:
number
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:28
Methods
concat()
concat():
Buffer
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:45
Returns the buffer by concatenating all written data.
Returns
Buffer
The concatenated buffer.
set()
set(
obj):any
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:40
Sets the internal buffers and calculates total length.
Parameters
obj
any
Object containing buffers (either buffers or bufs property)
Returns
any
Returns the instance for chaining
toBuffer()
toBuffer():
Buffer
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:52
Converts the internal buffer chunks into a single Buffer. If there's only one chunk, returns it directly. Otherwise, concatenates all chunks into a new Buffer.
Returns
Buffer
The combined buffer
write()
write(
buffer):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:34
Appends a buffer to the internal buffers array and updates the total length.
Parameters
buffer
Buffer
The buffer to append.
Returns
this
Returns the instance for chaining.
writeInt32LE()
writeInt32LE(
n):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:114
Writes a 32-bit signed integer in little-endian format to the buffer.
Parameters
n
number
The integer to write.
Returns
this
Returns the BufferWriter instance for chaining.
writeReverse()
writeReverse(
buf):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:58
Writes a buffer in reverse order to the current buffer.
Parameters
buf
Buffer
The buffer to be written in reverse.
Returns
this
Returns the instance for chaining.
writeUInt16BE()
writeUInt16BE(
n):BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:71
Writes a 16-bit unsigned integer in big-endian byte order. Internally converts the value to little-endian and reverses the bytes.
Parameters
n
number
The number to write (0-65535).
Returns
Returns the BufferWriter instance for chaining.
writeUInt16LE()
writeUInt16LE(
n):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:64
Writes a 16-bit unsigned integer in little-endian format.
Parameters
n
number
The number to write.
Returns
this
Returns the instance for chaining.
writeUInt32BE()
writeUInt32BE(
n):BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:83
Writes a 32-bit unsigned integer in big-endian format.
Parameters
n
number
The number to write.
Returns
Returns the BufferWriter instance for chaining.
writeUInt32LE()
writeUInt32LE(
n):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:77
Writes a 32-bit unsigned integer in little-endian format.
Parameters
n
number
The number to write.
Returns
this
Returns the instance for chaining.
writeUInt64BEBN()
writeUInt64BEBN(
bn):BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:102
Writes a 64-bit unsigned integer in big-endian byte order (as BN.js instance). Internally converts to little-endian and writes reversed for big-endian output.
Parameters
bn
BN
The BigNumber to write as 64-bit big-endian
Returns
Returns this instance for chaining
writeUInt64LEBN()
writeUInt64LEBN(
bn):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:95
Writes a 64-bit unsigned integer in little-endian byte order from a BigNumber.
Parameters
bn
any
The BigNumber to write.
Returns
this
Returns the BufferWriter instance for chaining.
writeUInt8()
writeUInt8(
n):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:89
Writes an unsigned 8-bit integer to the buffer in little-endian format.
Parameters
n
number
The number to write (0-255)
Returns
this
Returns the BufferWriter instance for chaining
writeVarintBN()
writeVarintBN(
bn):BufferWriter
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:125
Writes a variable-length integer (varint) to the buffer using BigNumber. Handles numbers of different sizes with appropriate encoding:
- Numbers < 253: 1 byte
- Numbers < 0x10000: 1 byte prefix (253) + 2 bytes
- Numbers < 0x100000000: 1 byte prefix (254) + 4 bytes
- Larger numbers: 1 byte prefix (255) + 8 bytes
Parameters
bn
BN
BigNumber to write as varint
Returns
Returns this for chaining
writeVarintNum()
writeVarintNum(
n):this
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:108
Writes a variable-length integer (varint) to the buffer.
Parameters
n
number
The number to write as varint
Returns
this
Returns the BufferWriter instance for chaining
varintBufNum()
staticvarintBufNum(n):Buffer
Defined in: node_modules/@opcat-labs/opcat/types/encoding/bufferwriter.d.cts:20
Converts a number to a varint-encoded Buffer.
Parameters
n
number
The number to encode.
Returns
Buffer
The varint-encoded Buffer.