Caleb J. Gardner
ad8222911f
Added Decompressor vtable interface. Directory table parsing Inode reading Metadata Reader
70 lines
2.4 KiB
Zig
70 lines
2.4 KiB
Zig
const std = @import("std");
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const Reader = std.Io.Reader;
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pub const BlockSize = packed struct {
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size: u31,
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uncompressed: bool,
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};
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pub const File = struct {
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block_start: u32,
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frag_idx: u32,
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block_offset: u32,
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size: u32,
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block_sizes: []BlockSize,
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pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !File {
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var buf: [16]u8 = undefined;
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try rdr.readSliceAll(&buf);
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const frag_idx = std.mem.readVarInt(u32, buf[4..8], .little);
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const size = std.mem.readVarInt(u32, buf[12..], .little);
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const sizes_len = size / block_size;
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if (frag_idx != 0xFFFFFFFF and size % block_size > 0)
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sizes_len += 1;
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const sizes = try alloc.alloc(BlockSize, sizes_len);
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errdefer alloc.free(sizes);
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try rdr.readSliceEndian(BlockSize, sizes, .little);
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return .{
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.block_start = std.mem.readVarInt(u32, buf[0..4], .little),
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.frag_idx = frag_idx,
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.block_offset = std.mem.readVarInt(u32, buf[8..12], .little),
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.size = size,
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.block_sizes = sizes,
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};
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}
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};
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pub const ExtFile = struct {
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block_start: u64,
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size: u64,
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sparse: u64,
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hard_links: u32,
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frag_idx: u32,
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block_offset: u32,
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xattr_idx: u32,
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block_sizes: []BlockSize,
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pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !File {
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var buf: [40]u8 = undefined;
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try rdr.readSliceAll(&buf);
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const frag_idx = std.mem.readVarInt(u32, buf[28..32], .little);
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const size = std.mem.readVarInt(u64, buf[8..16], .little);
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const sizes_len = size / block_size;
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if (frag_idx != 0xFFFFFFFF and size % block_size > 0)
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sizes_len += 1;
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const sizes = try alloc.alloc(BlockSize, sizes_len);
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errdefer alloc.free(sizes);
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try rdr.readSliceEndian(BlockSize, sizes, .little);
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return .{
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.block_start = std.mem.readVarInt(u64, buf[0..8], .little),
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.size = size,
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.sparse = std.mem.readVarInt(u64, buf[16..24], .little),
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.hard_links = std.mem.readVarInt(u32, buf[24..28], .little),
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.frag_idx = frag_idx,
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.block_offset = std.mem.readVarInt(u32, buf[32..36], .little),
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.xattr_idx = std.mem.readVarInt(u32, buf[36..40], .little),
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.block_sizes = sizes,
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};
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}
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};
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