Proper zig project organization

src/decompress.zig

@@ -0,0 +1,45 @@
+const std = @import("std");
+const compress = std.compress;
+
+const DecompressError = error{
+    LzoNotSupported,
+    Lz4NotSupported,
+};
+
+pub const CompressionType = enum(u16) {
+    gzip = 1,
+    lzma,
+    lzo,
+    xz,
+    lz4,
+    zstd,
+
+    pub fn Decompress(self: CompressionType, alloc: std.mem.Allocator, rdr: std.io.AnyReader) ![]u8 {
+        var out = std.ArrayList(u8).init(alloc);
+        defer out.deinit();
+        switch (self) {
+            .gzip => try compress.zlib.decompress(rdr, out.writer()),
+            .lzma => {
+                var decomp = try compress.lzma.decompress(alloc, rdr);
+                defer decomp.deinit();
+                try decomp.reader().readAllArrayList(&out, 1024 * 1024);
+            },
+            .lzo => return DecompressError.LzoNotSupported,
+            .xz => {
+                var decomp = try compress.xz.decompress(alloc, rdr);
+                defer decomp.deinit();
+                try decomp.reader().readAllArrayList(&out, 1024 * 1024);
+            },
+            .lz4 => return DecompressError.Lz4NotSupported,
+            .zstd => {
+                const buf = try alloc.alloc(u8, compress.zstd.DecompressorOptions.default_window_buffer_len);
+                defer alloc.free(buf);
+                var decomp = compress.zstd.decompressor(rdr, .{
+                    .window_buffer = buf,
+                });
+                try decomp.reader().readAllArrayList(&out, 1024 * 1024);
+            },
+        }
+        return try out.toOwnedSlice();
+    }
+};