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elf: scrap reader for preads when parsing archives

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This commit is contained in:
Jakub Konka 2024-02-13 18:57:49 +01:00
parent e5483b4ffc
commit de30b30202
1 changed files with 7 additions and 9 deletions
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16
src/link/Elf/Archive.zig
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@ -21,18 +21,17 @@ pub fn parse(self: *Archive, elf_file: *Elf, path: []const u8, handle_index: Fil
const handle = elf_file.fileHandle(handle_index);
const size = (try handle.stat()).size;
const reader = handle.reader();
_ = try reader.readBytesNoEof(elf.ARMAG.len);
var pos: usize = elf.ARMAG.len;
while (true) {
if (pos >= size) break;
if (!mem.isAligned(pos, 2)) {
try handle.seekBy(1);
pos += 1;
}
if (!mem.isAligned(pos, 2)) pos += 1;
const hdr = try reader.readStruct(elf.ar_hdr);
var hdr_buffer: [@sizeOf(elf.ar_hdr)]u8 = undefined;
{
const amt = try handle.preadAll(&hdr_buffer, pos);
if (amt != @sizeOf(elf.ar_hdr)) return error.InputOutput;
}
const hdr = @as(*align(1) const elf.ar_hdr, @ptrCast(&hdr_buffer)).*;
pos += @sizeOf(elf.ar_hdr);
if (!mem.eql(u8, &hdr.ar_fmag, elf.ARFMAG)) {
@ -44,7 +43,6 @@ pub fn parse(self: *Archive, elf_file: *Elf, path: []const u8, handle_index: Fil
const obj_size = try hdr.size();
defer {
_ = handle.seekBy(obj_size) catch {};
pos += obj_size;
}