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✨ Decode bencode from .solidpkg

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This commit is contained in:
C-3PO 2018-06-22 16:19:21 +02:00
parent 62a877617b
commit 3f79cb438c
Signed by: c3po
GPG key ID: 62993C4BB4D86F24
2 changed files with 10 additions and 10 deletions
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14
src/ssn/bencodeParser.ts
View file

@ -7,7 +7,7 @@ import { TextDecoder } from 'util';
const Decoder = new TextDecoder('utf-8'); const Decoder = new TextDecoder('utf-8');
/** Takes a Bencoded-encoded file, parses it at the given starting position and returns a JSON object, or rejects on error. */ /** Takes a Bencoded-encoded file, parses it at the given starting position and returns a JSON object, or rejects on error. */
export default function bpParse(dv: DataView, posIn: number, reject: (reason?: any) => void): { obj: any, pos: number } { export default function bpParse(dv: DataView, posIn: number = 0): { obj: any, pos: number } {
let pos = posIn; let pos = posIn;
let obj; let obj;
const header = dv.getUint8(pos++); const header = dv.getUint8(pos++);
@ -16,10 +16,10 @@ export default function bpParse(dv: DataView, posIn: number, reject: (reason?: a
obj = []; obj = [];
do { do {
//read key //read key
const out1 = bpParse(dv, pos, reject); const out1 = bpParse(dv, pos);
pos = out1.pos; pos = out1.pos;
//read value //read value
const out2 = bpParse(dv, pos, reject); const out2 = bpParse(dv, pos);
pos = out2.pos; pos = out2.pos;
obj[out1.obj] = out2.obj; obj[out1.obj] = out2.obj;
} while (dv.getUint8(pos) !== 0x65); //'e' - end } while (dv.getUint8(pos) !== 0x65); //'e' - end
@ -30,7 +30,7 @@ export default function bpParse(dv: DataView, posIn: number, reject: (reason?: a
obj = []; obj = [];
do { do {
//read entry //read entry
const out = bpParse(dv, pos, reject); const out = bpParse(dv, pos);
pos = out.pos; pos = out.pos;
obj.push(out.obj); obj.push(out.obj);
} while (dv.getUint8(pos) !== 0x65); //'e' - end } while (dv.getUint8(pos) !== 0x65); //'e' - end
@ -42,8 +42,7 @@ export default function bpParse(dv: DataView, posIn: number, reject: (reason?: a
let curNumber = 0; let curNumber = 0;
while (curChar !== 0x65) { //'e' - end while (curChar !== 0x65) { //'e' - end
if (curChar < 0x30 || curChar > 0x39) { if (curChar < 0x30 || curChar > 0x39) {
reject('Unexpected int char during bencode parsing'); throw new Error('Unexpected int char during bencode parsing');
return { obj: null, pos };
} }
curNumber *= 10; curNumber *= 10;
curNumber += curChar - 0x30; curNumber += curChar - 0x30;
@ -68,8 +67,7 @@ export default function bpParse(dv: DataView, posIn: number, reject: (reason?: a
break; break;
} }
default: default:
reject('Unexpected leading char during bencode parsing.'); throw new Error('Unexpected leading char during bencode parsing.');
return { obj: null, pos };
} }
return { obj, pos }; return { obj, pos };
} }

6
src/ssn/getSolidpkg.ts
View file

@ -1,10 +1,11 @@
import getUrlContents from '../getUrlContents'; import getUrlContents from '../getUrlContents';
import { Product } from '../interfaces/ISettings'; import { Product } from '../interfaces/ISettings';
import verifyProductName from '../verifyProductName'; import verifyProductName from '../verifyProductName';
import bpParse from './bencodeParser';
import extractFile from './extractFile'; import extractFile from './extractFile';
import readSsnFile from './readSsnFile'; import readSsnFile from './readSsnFile';
export default async function getSolidpkg(product: Product, from: number, to: number): Promise<ArrayBuffer> { export default async function getSolidpkg(product: Product, from: number, to: number): Promise<any> {
//Verify function arguments //Verify function arguments
if (!verifyProductName(product)) { if (!verifyProductName(product)) {
throw new Error(`"${product}" is not a valid product.`); throw new Error(`"${product}" is not a valid product.`);
@ -36,6 +37,7 @@ export default async function getSolidpkg(product: Product, from: number, to: nu
//Extract metafile.solid file //Extract metafile.solid file
const solidFile = await extractFile(firstFile, [new DataView(ssnFile)]); const solidFile = await extractFile(firstFile, [new DataView(ssnFile)]);
const solidContents = bpParse(new DataView(solidFile)).obj;
return solidFile; return solidContents;
} }