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const ascii = require('./lib/ascii')
const base64 = require('./lib/base64')
const hex = require('./lib/hex')
const utf8 = require('./lib/utf8')
const utf16le = require('./lib/utf16le')
const LE = new Uint8Array(Uint16Array.of(0xff).buffer)[0] === 0xff
function codecFor(encoding) {
switch (encoding) {
case 'ascii':
return ascii
case 'base64':
return base64
case 'hex':
return hex
case 'utf8':
case 'utf-8':
case undefined:
case null:
return utf8
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return utf16le
default:
throw new Error(`Unknown encoding '${encoding}'`)
}
}
function isBuffer(value) {
return value instanceof Uint8Array
}
function isEncoding(encoding) {
try {
codecFor(encoding)
return true
} catch {
return false
}
}
function alloc(size, fill, encoding) {
const buffer = new Uint8Array(size)
if (fill !== undefined) {
exports.fill(buffer, fill, 0, buffer.byteLength, encoding)
}
return buffer
}
function allocUnsafe(size) {
return new Uint8Array(size)
}
function allocUnsafeSlow(size) {
return new Uint8Array(size)
}
function byteLength(string, encoding) {
return codecFor(encoding).byteLength(string)
}
function compare(a, b) {
if (a === b) return 0
const len = Math.min(a.byteLength, b.byteLength)
a = new DataView(a.buffer, a.byteOffset, a.byteLength)
b = new DataView(b.buffer, b.byteOffset, b.byteLength)
let i = 0
for (let n = len - (len % 4); i < n; i += 4) {
const x = a.getUint32(i, LE)
const y = b.getUint32(i, LE)
if (x !== y) break
}
for (; i < len; i++) {
const x = a.getUint8(i)
const y = b.getUint8(i)
if (x < y) return -1
if (x > y) return 1
}
return a.byteLength > b.byteLength ? 1 : a.byteLength < b.byteLength ? -1 : 0
}
function concat(buffers, length) {
if (length === undefined) {
length = buffers.reduce((len, buffer) => len + buffer.byteLength, 0)
}
const result = new Uint8Array(length)
let offset = 0
for (const buffer of buffers) {
if (offset + buffer.byteLength > result.byteLength) {
result.set(buffer.subarray(0, result.byteLength - offset), offset)
return result
}
result.set(buffer, offset)
offset += buffer.byteLength
}
return result
}
function copy(
source,
target,
targetStart = 0,
sourceStart = 0,
sourceEnd = source.byteLength
) {
if (targetStart < 0) targetStart = 0
if (targetStart >= target.byteLength) return 0
const targetLength = target.byteLength - targetStart
if (sourceStart < 0) sourceStart = 0
if (sourceStart >= source.byteLength) return 0
if (sourceEnd <= sourceStart) return 0
if (sourceEnd > source.byteLength) sourceEnd = source.byteLength
if (sourceEnd - sourceStart > targetLength) {
sourceEnd = sourceStart + targetLength
}
const sourceLength = sourceEnd - sourceStart
if (source === target) {
target.copyWithin(targetStart, sourceStart, sourceEnd)
} else {
if (sourceStart !== 0 || sourceEnd !== source.byteLength) {
source = source.subarray(sourceStart, sourceEnd)
}
target.set(source, targetStart)
}
return sourceLength
}
function equals(a, b) {
if (a === b) return true
if (a.byteLength !== b.byteLength) return false
return compare(a, b) === 0
}
function fill(
buffer,
value,
offset = 0,
end = buffer.byteLength,
encoding = 'utf8'
) {
if (typeof value === 'string') {
if (typeof offset === 'string') {
// fill(string, encoding)
encoding = offset
offset = 0
end = buffer.byteLength
} else if (typeof end === 'string') {
// fill(string, offset, encoding)
encoding = end
end = buffer.byteLength
}
} else if (typeof value === 'number') {
value = value & 0xff
} else if (typeof value === 'boolean') {
value = +value
}
if (offset < 0) offset = 0
if (offset >= buffer.byteLength) return buffer
if (end <= offset) return buffer
if (end > buffer.byteLength) end = buffer.byteLength
if (typeof value === 'number') return buffer.fill(value, offset, end)
if (typeof value === 'string') value = exports.from(value, encoding)
const len = value.byteLength
for (let i = 0, n = end - offset; i < n; ++i) {
buffer[i + offset] = value[i % len]
}
return buffer
}
function from(value, encodingOrOffset, length) {
// from(string, encoding)
if (typeof value === 'string') return fromString(value, encodingOrOffset)
// from(array)
if (Array.isArray(value)) return fromArray(value)
// from(buffer)
if (ArrayBuffer.isView(value)) return fromBuffer(value)
// from(arrayBuffer[, byteOffset[, length]])
return fromArrayBuffer(value, encodingOrOffset, length)
}
function fromString(string, encoding) {
const codec = codecFor(encoding)
const buffer = new Uint8Array(codec.byteLength(string))
codec.write(buffer, string)
return buffer
}
function fromArray(array) {
const buffer = new Uint8Array(array.length)
buffer.set(array)
return buffer
}
function fromBuffer(buffer) {
const copy = new Uint8Array(buffer.byteLength)
copy.set(buffer)
return copy
}
function fromArrayBuffer(arrayBuffer, byteOffset, length) {
return new Uint8Array(arrayBuffer, byteOffset, length)
}
function includes(buffer, value, byteOffset, encoding) {
return indexOf(buffer, value, byteOffset, encoding) !== -1
}
function indexOf(buffer, value, byteOffset, encoding) {
return bidirectionalIndexOf(
buffer,
value,
byteOffset,
encoding,
true /* first */
)
}
function lastIndexOf(buffer, value, byteOffset, encoding) {
return bidirectionalIndexOf(
buffer,
value,
byteOffset,
encoding,
false /* last */
)
}
function bidirectionalIndexOf(buffer, value, byteOffset, encoding, first) {
if (buffer.byteLength === 0) return -1
if (typeof byteOffset === 'string') {
encoding = byteOffset
byteOffset = 0
} else if (byteOffset === undefined) {
byteOffset = first ? 0 : buffer.length - 1
} else if (byteOffset < 0) {
byteOffset += buffer.byteLength
}
if (byteOffset >= buffer.byteLength) {
if (first) return -1
else byteOffset = buffer.byteLength - 1
} else if (byteOffset < 0) {
if (first) byteOffset = 0
else return -1
}
if (typeof value === 'string') {
value = from(value, encoding)
} else if (typeof value === 'number') {
value = value & 0xff
if (first) {
return buffer.indexOf(value, byteOffset)
} else {
return buffer.lastIndexOf(value, byteOffset)
}
}
if (value.byteLength === 0) return -1
if (first) {
let foundIndex = -1
for (let i = byteOffset; i < buffer.byteLength; i++) {
if (buffer[i] === value[foundIndex === -1 ? 0 : i - foundIndex]) {
if (foundIndex === -1) foundIndex = i
if (i - foundIndex + 1 === value.byteLength) return foundIndex
} else {
if (foundIndex !== -1) i -= i - foundIndex
foundIndex = -1
}
}
} else {
if (byteOffset + value.byteLength > buffer.byteLength) {
byteOffset = buffer.byteLength - value.byteLength
}
for (let i = byteOffset; i >= 0; i--) {
let found = true
for (let j = 0; j < value.byteLength; j++) {
if (buffer[i + j] !== value[j]) {
found = false
break
}
}
if (found) return i
}
}
return -1
}
function swap(buffer, n, m) {
const i = buffer[n]
buffer[n] = buffer[m]
buffer[m] = i
}
function swap16(buffer) {
const len = buffer.byteLength
if (len % 2 !== 0)
throw new RangeError('Buffer size must be a multiple of 16-bits')
for (let i = 0; i < len; i += 2) swap(buffer, i, i + 1)
return buffer
}
function swap32(buffer) {
const len = buffer.byteLength
if (len % 4 !== 0)
throw new RangeError('Buffer size must be a multiple of 32-bits')
for (let i = 0; i < len; i += 4) {
swap(buffer, i, i + 3)
swap(buffer, i + 1, i + 2)
}
return buffer
}
function swap64(buffer) {
const len = buffer.byteLength
if (len % 8 !== 0)
throw new RangeError('Buffer size must be a multiple of 64-bits')
for (let i = 0; i < len; i += 8) {
swap(buffer, i, i + 7)
swap(buffer, i + 1, i + 6)
swap(buffer, i + 2, i + 5)
swap(buffer, i + 3, i + 4)
}
return buffer
}
function toBuffer(buffer) {
return buffer
}
function toString(
buffer,
encoding = 'utf8',
start = 0,
end = buffer.byteLength
) {
// toString(buffer)
if (arguments.length === 1) return utf8.toString(buffer)
// toString(buffer, encoding)
if (arguments.length === 2) return codecFor(encoding).toString(buffer)
if (start < 0) start = 0
if (start >= buffer.byteLength) return ''
if (end <= start) return ''
if (end > buffer.byteLength) end = buffer.byteLength
if (start !== 0 || end !== buffer.byteLength) {
buffer = buffer.subarray(start, end)
}
return codecFor(encoding).toString(buffer)
}
function write(buffer, string, offset, length, encoding) {
// write(buffer, string)
if (arguments.length === 2) return utf8.write(buffer, string)
if (typeof offset === 'string') {
// write(buffer, string, encoding)
encoding = offset
offset = 0
length = buffer.byteLength
} else if (typeof length === 'string') {
// write(buffer, string, offset, encoding)
encoding = length
length = buffer.byteLength - offset
}
length = Math.min(length, exports.byteLength(string, encoding))
let start = offset
if (start < 0) start = 0
if (start >= buffer.byteLength) return 0
let end = offset + length
if (end <= start) return 0
if (end > buffer.byteLength) end = buffer.byteLength
if (start !== 0 || end !== buffer.byteLength) {
buffer = buffer.subarray(start, end)
}
return codecFor(encoding).write(buffer, string)
}
function readDoubleBE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getFloat64(offset, false)
}
function readDoubleLE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getFloat64(offset, true)
}
function readFloatBE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getFloat32(offset, false)
}
function readFloatLE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getFloat32(offset, true)
}
function readInt32BE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getInt32(offset, false)
}
function readInt32LE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getInt32(offset, true)
}
function readUInt32BE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getUint32(offset, false)
}
function readUInt32LE(buffer, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
return view.getUint32(offset, true)
}
function writeDoubleBE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat64(offset, value, false)
return offset + 8
}
function writeDoubleLE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat64(offset, value, true)
return offset + 8
}
function writeFloatBE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat32(offset, value, false)
return offset + 4
}
function writeFloatLE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat32(offset, value, true)
return offset + 4
}
function writeInt32BE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setInt32(offset, value, false)
return offset + 4
}
function writeInt32LE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setInt32(offset, value, true)
return offset + 4
}
function writeUInt32BE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setUint32(offset, value, false)
return offset + 4
}
function writeUInt32LE(buffer, value, offset = 0) {
const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setUint32(offset, value, true)
return offset + 4
}
module.exports = exports = {
isBuffer,
isEncoding,
alloc,
allocUnsafe,
allocUnsafeSlow,
byteLength,
compare,
concat,
copy,
equals,
fill,
from,
includes,
indexOf,
lastIndexOf,
swap16,
swap32,
swap64,
toBuffer,
toString,
write,
readDoubleBE,
readDoubleLE,
readFloatBE,
readFloatLE,
readInt32BE,
readInt32LE,
readUInt32BE,
readUInt32LE,
writeDoubleBE,
writeDoubleLE,
writeFloatBE,
writeFloatLE,
writeInt32BE,
writeInt32LE,
writeUInt32BE,
writeUInt32LE
}