91 lines
2.4 KiB
JavaScript
91 lines
2.4 KiB
JavaScript
|
import { Token, Type } from './token.js'
|
||
|
|
import { assertEnoughData, decodeErrPrefix } from './common.js'
|
||
|
|
import * as uint from './0uint.js'
|
||
|
|
import { encodeBytes } from './2bytes.js'
|
||
|
|
import { toString, slice } from './byte-utils.js'
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @typedef {import('./bl.js').Bl} Bl
|
||
|
|
* @typedef {import('../interface').DecodeOptions} DecodeOptions
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} prefix
|
||
|
|
* @param {number} length
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
function toToken (data, pos, prefix, length, options) {
|
||
|
|
const totLength = prefix + length
|
||
|
|
assertEnoughData(data, pos, totLength)
|
||
|
|
const tok = new Token(Type.string, toString(data, pos + prefix, pos + totLength), totLength)
|
||
|
|
if (options.retainStringBytes === true) {
|
||
|
|
tok.byteValue = slice(data, pos + prefix, pos + totLength)
|
||
|
|
}
|
||
|
|
return tok
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} minor
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
export function decodeStringCompact (data, pos, minor, options) {
|
||
|
|
return toToken(data, pos, 1, minor, options)
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} _minor
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
export function decodeString8 (data, pos, _minor, options) {
|
||
|
|
return toToken(data, pos, 2, uint.readUint8(data, pos + 1, options), options)
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} _minor
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
export function decodeString16 (data, pos, _minor, options) {
|
||
|
|
return toToken(data, pos, 3, uint.readUint16(data, pos + 1, options), options)
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} _minor
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
export function decodeString32 (data, pos, _minor, options) {
|
||
|
|
return toToken(data, pos, 5, uint.readUint32(data, pos + 1, options), options)
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: maybe we shouldn't support this ..
|
||
|
|
/**
|
||
|
|
* @param {Uint8Array} data
|
||
|
|
* @param {number} pos
|
||
|
|
* @param {number} _minor
|
||
|
|
* @param {DecodeOptions} options
|
||
|
|
* @returns {Token}
|
||
|
|
*/
|
||
|
|
export function decodeString64 (data, pos, _minor, options) {
|
||
|
|
const l = uint.readUint64(data, pos + 1, options)
|
||
|
|
if (typeof l === 'bigint') {
|
||
|
|
throw new Error(`${decodeErrPrefix} 64-bit integer string lengths not supported`)
|
||
|
|
}
|
||
|
|
return toToken(data, pos, 9, l, options)
|
||
|
|
}
|
||
|
|
|
||
|
|
export const encodeString = encodeBytes
|