blob: 6274b3b1d0bba91347f8f6a069491ccbc0f1623c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
//! Akiba format parser
const akiba_const = @import("../../common/constants/akiba.zig");
const types = @import("types.zig");
pub fn parse(data: []const u8) !types.Executable {
if (data.len < @sizeOf(types.Header)) {
return error.TooSmall;
}
const header = @as(*const types.Header, @ptrCast(@alignCast(data.ptr)));
for (akiba_const.MAGIC, 0..) |byte, i| {
if (header.magic[i] != byte) {
return error.InvalidMagic;
}
}
if (header.version == 0 or header.version > akiba_const.VERSION) {
return error.UnsupportedVersion;
}
if (header.exec_type > akiba_const.TYPE_LIBRARY) {
return error.InvalidExecutableType;
}
if (header.elf_size == 0) {
return error.EmptyELF;
}
if (header.elf_offset < @sizeOf(types.Header)) {
return error.InvalidELFOffset;
}
if (header.elf_offset + header.elf_size > data.len) {
return error.InvalidELFBounds;
}
const elf_data = data[header.elf_offset .. header.elf_offset + header.elf_size];
var metadata: ?types.Metadata = null;
if (header.metadata_offset > 0 and header.metadata_size > 0) {
if (header.metadata_offset + header.metadata_size <= data.len) {
const meta_ptr = data.ptr + header.metadata_offset;
metadata = @as(*const types.Metadata, @ptrCast(@alignCast(meta_ptr))).*;
}
}
return types.Executable{
.header = header.*,
.elf_data = elf_data,
.metadata = metadata,
};
}
pub fn validate_magic(data: []const u8) bool {
if (data.len < 8) return false;
for (akiba_const.MAGIC, 0..) |byte, i| {
if (data[i] != byte) return false;
}
return true;
}
|
