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patterns: Add ASCII CPIO patterns. (#473)

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This commit is contained in:
Jarkko Pöyry
2026-01-03 21:24:31 +02:00
committed by GitHub
parent 2d92bfca13
commit 190f9d891b
5 changed files with 89 additions and 0 deletions
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41
patterns/cpio_portable_ascii.hexpat Normal file
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#pragma author gunjambi
#pragma description Portable ASCII CPIO
#pragma magic [ 30 37 30 37 30 37 ] @ 0x00
import std.time;
import std.string;
namespace portable_ascii {
fn format_octal_time(str value) {
return std::time::format(std::time::to_utc(std::string::parse_int(value, 8)));
};
fn parse_octal_string(str field) {
return std::string::parse_int(field, 8);
};
struct Cpio {
char c_magic[6];
if (c_magic != "070707") {
std::error("Invalid CPIO Magic!");
}
char c_dev[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_ino[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_mode[6];
char c_uid[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_gid[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_nlink[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_rdev[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_mtime[11] [[format("portable_ascii::format_octal_time")]];
char c_namesize[6] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char c_filesize[11] [[format("portable_ascii::parse_octal_string"), transform("portable_ascii::parse_octal_string")]];
char filename[c_namesize - 1];
padding[1];
if (filename == "TRAILER!!!")
break;
u8 data[c_filesize];
};
}
portable_ascii::Cpio cpio[while(true)] @ 0x00;