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🎨 Update solidpkg reader

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This commit is contained in:
C-3PO 2018-06-22 11:34:22 +02:00
parent 400be4f296
commit ca2862fb3d
Signed by: c3po
GPG key ID: 62993C4BB4D86F24
1 changed files with 15 additions and 7 deletions
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22
src/ssn/readSolidpkg.ts
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@ -1,8 +1,8 @@
import { TextDecoder } from 'util'; import { TextDecoder } from 'util';
import modifyPassword from './modifyPassword'; import modifyPassword from './modifyPassword';
const MAGIC_END_OF_CENTRAL_DIR = 0x06054b50; const SIGNATURE_END_OF_CENTRAL_DIR = 0x06054b50;
const MAGIC_CENTRAL_DIR = 0x02014b50; const SIGNATURE_CENTRAL_DIR = 0x02014b50;
const COMPRESSION_DEFLATE = 8; const COMPRESSION_DEFLATE = 8;
const Decoder = new TextDecoder('utf-8'); const Decoder = new TextDecoder('utf-8');
@ -17,7 +17,7 @@ export default function readSolidpkg(buffer: Buffer) {
let pos = buffer.length - 22; //end of central dir is at least 22 bytes long let pos = buffer.length - 22; //end of central dir is at least 22 bytes long
//Find end of central dir //Find end of central dir
while (pos >= 0 && dv.getUint32(pos, true) !== MAGIC_END_OF_CENTRAL_DIR) { while (pos >= 0 && dv.getUint32(pos, true) !== SIGNATURE_END_OF_CENTRAL_DIR) {
pos -= 1; pos -= 1;
} }
if (pos < 0) { if (pos < 0) {
@ -25,7 +25,11 @@ export default function readSolidpkg(buffer: Buffer) {
} }
pos += 4; pos += 4;
//skip 6 bytes /** skip 6 bytes:
* number of this disk,
* number of the disk with the start of the central directory
* total number of entries in the central directory on this disk
*/
pos += 6; pos += 6;
/** Total number of entries in the central directory */ /** Total number of entries in the central directory */
@ -34,6 +38,7 @@ export default function readSolidpkg(buffer: Buffer) {
const centralDirSize = dv.getUint32(pos, true); pos += 4; const centralDirSize = dv.getUint32(pos, true); pos += 4;
/** Offset of start of central directory with respect to the starting disk number */ /** Offset of start of central directory with respect to the starting disk number */
const centralDirOffset = dv.getUint32(pos, true); pos += 4; const centralDirOffset = dv.getUint32(pos, true); pos += 4;
//ignore .ZIP file comment length
if (numEntries !== 1) { if (numEntries !== 1) {
throw new Error(`Expected numEntries == 1 in end of central dir but it was "${numEntries}"`); throw new Error(`Expected numEntries == 1 in end of central dir but it was "${numEntries}"`);
@ -51,9 +56,9 @@ export default function readSolidpkg(buffer: Buffer) {
pos -= 20 + centralDirSize; pos -= 20 + centralDirSize;
{ {
const magicNum = dv.getUint32(pos, true); pos += 4; const signature = dv.getUint32(pos, true); pos += 4;
if (magicNum !== MAGIC_CENTRAL_DIR) { if (signature !== SIGNATURE_CENTRAL_DIR) {
throw new Error(`Expected central dir signature but found "0x${magicNum.toString(16)}"`); throw new Error(`Expected central dir signature but found "0x${signature.toString(16)}"`);
} }
} }
@ -82,6 +87,9 @@ export default function readSolidpkg(buffer: Buffer) {
pos += 8; //skip disk num start and file attributes pos += 8; //skip disk num start and file attributes
const relOffset = dv.getUint32(pos, true); pos += 4; const relOffset = dv.getUint32(pos, true); pos += 4;
const fileName = Decoder.decode(new DataView(arrayBuffer, pos, fileNameLength)); pos += fileNameLength; //skip file name const fileName = Decoder.decode(new DataView(arrayBuffer, pos, fileNameLength)); pos += fileNameLength; //skip file name
if (fileName !== 'metafile.solid') {
throw new Error(`Expected file name to be "metafile.solid" but it was "${fileName}".`);
}
//read password from extra field //read password from extra field
let encodedPassword: Uint8Array | undefined; let encodedPassword: Uint8Array | undefined;