mary.my.id
streaming 7-Zip archive extractor
1/**
2 * @module
3 *
4 * constants shared across the 7z parser and decoder layers: the file
5 * signature, property tag IDs from the format specification, and the
6 * well-known coder method identifiers.
7 */
8
9/** the 6-byte magic at the start of every 7z archive: `"7z\xbc\xaf\x27\x1c"`. */
10export const SIGNATURE: Uint8Array<ArrayBuffer> = new Uint8Array([0x37, 0x7a, 0xbc, 0xaf, 0x27, 0x1c]);
11
12/** total length of the fixed-size signature header at the start of the file. */
13export const SIGNATURE_HEADER_SIZE = 32;
14
15/**
16 * NID property tags used in the 7z header. names mirror the LZMA-SDK reference
17 * source (`CPP/7zip/Archive/7z/7zHeader.h`).
18 */
19export const Property = {
20 additionalStreamsInfo: 0x03,
21 anti: 0x10,
22 archiveProperties: 0x02,
23 aTime: 0x13,
24 codersUnpackSize: 0x0c,
25 comment: 0x16,
26 crc: 0x0a,
27 cTime: 0x12,
28 dummy: 0x19,
29 emptyFile: 0x0f,
30 emptyStream: 0x0e,
31 encodedHeader: 0x17,
32 end: 0x00,
33 filesInfo: 0x05,
34 folder: 0x0b,
35 header: 0x01,
36 mainStreamsInfo: 0x04,
37 mTime: 0x14,
38 name: 0x11,
39 numUnpackStream: 0x0d,
40 packInfo: 0x06,
41 size: 0x09,
42 startPos: 0x18,
43 subStreamsInfo: 0x08,
44 unpackInfo: 0x07,
45 winAttributes: 0x15,
46} as const;
47
48/**
49 * well-known coder method IDs from the LZMA-SDK reference
50 * (`CPP/7zip/Archive/7z/7zHandler.cpp`). encoded big-endian as variable-length
51 * byte sequences in the archive; we treat them as JS numbers for switching.
52 */
53export const Method = {
54 aes256Sha256: 0x06f10701,
55 arm: 0x03030501,
56 arm64: 0x0a,
57 armthumb: 0x03030701,
58 bcj: 0x03030103,
59 bcj2: 0x0303011b,
60 bzip2: 0x040202,
61 copy: 0x00,
62 deflate: 0x040108,
63 delta: 0x03,
64 ia64: 0x03030401,
65 lzma: 0x030101,
66 lzma2: 0x21,
67 powerpc: 0x03030205,
68 riscv: 0x0b,
69 sparc: 0x03030805,
70 zstd: 0x04f71101,
71} as const;