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patterns/tar: Support PAX archives (#77)

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There are two common magic values for archives: the [GNU one](https://git.savannah.gnu.org/cgit/tar.git/tree/src/tar.h#n160) (8 bytes) and the [ustar one](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06) (6 bytes).

This change has the pattern support both.
This commit is contained in:
Hank Donnay
2023-01-17 15:51:11 -06:00
committed by GitHub
parent 862d4d1c28
commit 32158edb3a
1 changed files with 3 additions and 2 deletions
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5
patterns/tar.hexpat
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@@ -9,7 +9,8 @@
#include <std/sys.pat>
#define HEADER "ustar "
#define GNU_HEADER "ustar "
#define PAX_HEADER "ustar\x00"
#define NULL "\x00"
fn octal_to_decimal(str value) {
@@ -83,6 +84,6 @@ struct tar {
};
char magic[6] @ 0x00000101 [[hidden]];
std::assert(magic == HEADER, "Magic bytes are not correct! Perhaps wrong file?");
std::assert(magic == PAX_HEADER || magic == GNU_HEADER, "Magic bytes are not correct! Perhaps wrong file?");
tar tar[while(!std::mem::eof())] @ 0x000;