Talk:Apk spec
- APK v2 package/index terminology
record A 512 byte sequence of bytes, a block h Header record d Data record e1, e2 Eof markers (two blocks 1024 bytes) tar archive A tar archive file, consiting of a set of files, a sequence of blocks ending with the eof marker blocks. tar segment A set of tar records, a sequence of tar records withouth a ending eof marker. gzip stream A stream is a sequence gzip compressed data, starting with a magic number, headers, body and an ending 8-byte trailer. [ ... ] A gzip stream containing blocks concatenate To link togther things in a series or chain. ie. concatenate.
Concatenate 3 gzip streams sequentially in a file.
package signature A single file that is a binary signature over the concatenated (control + data) gzip streams package signature file DigestRSA-PKCS1v15(SHA1( apk-gzip-stream-2 ++ apk-gzip-stream-3), DER) index signature file DigestRSA-PKCS1v15(SHA1( index-gzip-stream-2), DER) h A tar header record block h1 Signature file header, permission 0644, uid 0 and gid 0. C: checksum The SHA1 hash of the "Control data" gzip stream (gzip stream 2)
| Gzip Streams | apk-gzip-stream1 | apk-gzip-stream2 | apk-gzip-stream-3 |
| Tar | apk-tar-segment-1 | apk-tar-segment-2 | apk-tarball |
| Blocks | [h1, d, ...] | [h, d, ...] | [h, d, h, d, ..., e1, e2 ] |
| Files | Package Signature | Control Data | Package Data |
| Gzip Streams | index-gzip-stream1 | index-gzip-stream2 |
| Tar | index-tar-segment-1 | index-tar-segment-2 |
| Blocks | [h1, d, ...] | [h, d, ..., d1, d2] |
| Files | Package Signature | Description and APKINDEX |