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std.elf: expose parsing decoupled from std.fs.File

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This commit is contained in:
Asherah Connor 2021-01-13 17:32:48 +11:00
parent 2b0e3ee228
commit 23fb19fe41
1 changed files with 6 additions and 2 deletions
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8
lib/std/elf.zig
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@ -365,8 +365,12 @@ const Header = struct {
pub fn readHeader(file: File) !Header {
var hdr_buf: [@sizeOf(Elf64_Ehdr)]u8 align(@alignOf(Elf64_Ehdr)) = undefined;
try preadNoEof(file, &hdr_buf, 0);
const hdr32 = @ptrCast(*Elf32_Ehdr, &hdr_buf);
const hdr64 = @ptrCast(*Elf64_Ehdr, &hdr_buf);
return parseHeader(hdr_buf);
}
pub fn parseHeader(hdr_buf: *align(@alignOf(Elf64_Ehdr)) const [@sizeOf(Elf64_Ehdr)]u8) !Header {
const hdr32 = @ptrCast(*const Elf32_Ehdr, hdr_buf);
const hdr64 = @ptrCast(*const Elf64_Ehdr, hdr_buf);
if (!mem.eql(u8, hdr32.e_ident[0..4], "\x7fELF")) return error.InvalidElfMagic;
if (hdr32.e_ident[EI_VERSION] != 1) return error.InvalidElfVersion;