Belac/zig-squashfs
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Finished an initial version of extraction

Browse Source 
It works, but is very slow.
This commit is contained in:
Caleb Gardner
2026-05-21 05:07:02 -05:00
parent 69ce562b6c
commit d1d453ac29
7 changed files with 276 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/lookup_table.zig
+32 -1
View File
@@ -24,6 +24,8 @@ pub fn lookupValue(comptime T: anytype, alloc: std.mem.Allocator, io: Io, decomp
return out;
}
pub const Error = Io.Cancelable || Io.File.Reader.SeekError || Io.Reader.ReadAllocError;
pub fn CachedTable(comptime T: anytype) type {
return struct {
const T_PER_BLOCK: u16 = 8192 / @sizeOf(T);
@@ -55,10 +57,39 @@ pub fn CachedTable(comptime T: anytype) type {
}
pub fn deinit(self: *Table, io: Io) void {
self.mut.lockUncancelable(io);
var iter = self.table.valueIterator();
while (iter.next()) |val|
self.alloc.free(val.*);
self.table.deinit();
}
pub fn get(self: *Table, io: Io, idx: u32) !T {
pub fn fill(self: *Table, io: Io) Error!void {
try self.mut.lock(io);
defer self.mut.unlock(io);
var num_blocks = self.total_num / T_PER_BLOCK;
if (self.total_num % T_PER_BLOCK > 0)
num_blocks += 1;
for (0..num_blocks) |block| {
var rdr = try self.fil.readerAt(io, self.table_start + (8 * block), &[0]u8{});
var offset: u64 = undefined;
try rdr.interface.readSliceEndian(u64, @ptrCast(&offset), .little);
const len: u16 = if (self.total_num % T_PER_BLOCK != 0 and block == (self.total_num - 1) / T_PER_BLOCK)
@truncate(self.total_num % T_PER_BLOCK)
else
T_PER_BLOCK;
rdr = try self.fil.readerAt(io, offset, &[0]u8{});
var meta: MetadataReader = .init(self.alloc, &rdr.interface, self.decomp);
const slice = try meta.interface.readSliceEndianAlloc(self.alloc, T, len, .little);
try self.table.put(@truncate(block), slice);
}
}
pub fn get(self: *Table, io: Io, idx: u32) Error!T {
const block = idx / T_PER_BLOCK;
const block_offset = idx % T_PER_BLOCK;
if (self.table.contains(block))