Enhance garbage collection and caching functionality

- Updated .gitignore to include all .exe files and ensure .smashignore is tracked.
- Expanded README.md with advanced configuration options for garbage collection algorithms, detailing available algorithms and use cases.
- Modified launch.json to include memory and disk garbage collection flags for better configuration.
- Refactored root.go to introduce memoryGC and diskGC flags for garbage collection algorithms.
- Implemented hash extraction and verification in steamcache.go to ensure data integrity during caching.
- Added new tests in steamcache_test.go for hash extraction and verification, ensuring correctness of caching behavior.
- Enhanced garbage collection strategies in gc.go, introducing LFU, FIFO, Largest, Smallest, and Hybrid algorithms with corresponding metrics.
- Updated caching logic to conditionally cache responses based on hash verification results.

vfs/gc/gc_test.go

@@ -2,71 +2,41 @@
 package gc
 
 import (
-	"errors"
-	"fmt"
-	"s1d3sw1ped/SteamCache2/vfs/memory"
 	"testing"
 )
 
-func TestGCOnFull(t *testing.T) {
-	m := memory.New(10)
-	gc := New(m, LRUGC)
+func TestGetGCAlgorithm(t *testing.T) {
+	tests := []struct {
+		name      string
+		algorithm GCAlgorithm
+		expected  bool // true if we expect a non-nil function
+	}{
+		{"LRU", LRU, true},
+		{"LFU", LFU, true},
+		{"FIFO", FIFO, true},
+		{"Largest", Largest, true},
+		{"Smallest", Smallest, true},
+		{"Hybrid", Hybrid, true},
+		{"Unknown", "unknown", true}, // should fall back to LRU
+		{"Empty", "", true},          // should fall back to LRU
+	}
 
-	for i := 0; i < 5; i++ {
-		w, err := gc.Create(fmt.Sprintf("key%d", i), 2)
-		if err != nil {
-			t.Fatalf("Create failed: %v", err)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			fn := GetGCAlgorithm(tt.algorithm)
+			if fn == nil {
+				t.Errorf("GetGCAlgorithm(%s) returned nil, expected non-nil function", tt.algorithm)
+			}
+		})
+	}
+}
+
+func TestGCAlgorithmConstants(t *testing.T) {
+	expectedAlgorithms := []GCAlgorithm{LRU, LFU, FIFO, Largest, Smallest, Hybrid}
+
+	for _, algo := range expectedAlgorithms {
+		if algo == "" {
+			t.Errorf("GC algorithm constant is empty")
 		}
-		w.Write([]byte("ab"))
-		w.Close()
-	}
-
-	// Cache full at 10 bytes
-	w, err := gc.Create("key5", 2)
-	if err != nil {
-		t.Fatalf("Create failed: %v", err)
-	}
-	w.Write([]byte("cd"))
-	w.Close()
-
-	if gc.Size() > 10 {
-		t.Errorf("Size exceeded: %d > 10", gc.Size())
-	}
-
-	// Check if older keys were evicted
-	_, err = m.Open("key0")
-	if err == nil {
-		t.Error("Expected key0 to be evicted")
-	}
-}
-
-func TestNoGCNeeded(t *testing.T) {
-	m := memory.New(20)
-	gc := New(m, LRUGC)
-
-	for i := 0; i < 5; i++ {
-		w, err := gc.Create(fmt.Sprintf("key%d", i), 2)
-		if err != nil {
-			t.Fatalf("Create failed: %v", err)
-		}
-		w.Write([]byte("ab"))
-		w.Close()
-	}
-
-	if gc.Size() != 10 {
-		t.Errorf("Size: got %d, want 10", gc.Size())
-	}
-}
-
-func TestGCInsufficientSpace(t *testing.T) {
-	m := memory.New(5)
-	gc := New(m, LRUGC)
-
-	w, err := gc.Create("key0", 10)
-	if err == nil {
-		w.Close()
-		t.Error("Expected ErrDiskFull")
-	} else if !errors.Is(err, ErrInsufficientSpace) {
-		t.Errorf("Unexpected error: %v", err)
 	}
 }