44 lines
1014 B
JavaScript
44 lines
1014 B
JavaScript
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export default class Stream {
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constructor (data) {
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if (data.toString().indexOf('ArrayBuffer') > 0) {
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data = new Uint8Array(data);
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}
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this.data = data;
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this.len = this.data.length;
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this.pos = 0;
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}
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readByte () {
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if (this.pos >= this.data.length) {
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throw new Error('Attempted to read past end of stream.');
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}
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if (this.data instanceof Uint8Array)
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return this.data[this.pos++];
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else
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return this.data.charCodeAt(this.pos++) & 0xFF;
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}
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readBytes (n) {
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const bytes = [];
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for (let i = 0; i < n; i++) {
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bytes.push(this.readByte());
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}
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return bytes;
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}
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read (n) {
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let s = '';
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for (let i = 0; i < n; i++) {
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s += String.fromCharCode(this.readByte());
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}
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return s;
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}
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readUnsigned () { // Little-endian.
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const a = this.readBytes(2);
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return (a[1] << 8) + a[0];
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}
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}
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