[varint] Add LEB128 decoding + tests

Also make tests in general less spammy: Don't print [PASS] for each successful test, only report failures and progress.

tests/core/encoding/json/test_core_json.odin

@@ -9,32 +9,30 @@ TEST_count := 0
 TEST_fail  := 0
 
 when ODIN_TEST {
-    expect  :: testing.expect
-    log     :: testing.log
+	expect  :: testing.expect
+	log     :: testing.log
 } else {
-    expect  :: proc(t: ^testing.T, condition: bool, message: string, loc := #caller_location) {
-        fmt.printf("[%v] ", loc)
-        TEST_count += 1
-        if !condition {
-            TEST_fail += 1
-            fmt.println(message)
-            return
-        }
-        fmt.println(" PASS")
-    }
-    log     :: proc(t: ^testing.T, v: any, loc := #caller_location) {
-        fmt.printf("[%v] ", loc)
-        fmt.printf("log: %v\n", v)
-    }
+	expect  :: proc(t: ^testing.T, condition: bool, message: string, loc := #caller_location) {
+		TEST_count += 1
+		if !condition {
+			TEST_fail += 1
+			fmt.printf("[%v] %v\n", loc, message)
+			return
+		}
+	}
+	log     :: proc(t: ^testing.T, v: any, loc := #caller_location) {
+		fmt.printf("[%v] ", loc)
+		fmt.printf("log: %v\n", v)
+	}
 }
 
 main :: proc() {
-    t := testing.T{}
-	
+	t := testing.T{}
+
 	parse_json(&t)
 	marshal_json(&t)
 
-    fmt.printf("%v/%v tests successful.\n", TEST_count - TEST_fail, TEST_count)
+	fmt.printf("%v/%v tests successful.\n", TEST_count - TEST_fail, TEST_count)
 	if TEST_fail > 0 {
 		os.exit(1)
 	}

tests/core/encoding/varint/test_core_varint.odin

@@ -0,0 +1,81 @@
+package test_core_varint
+
+import "core:encoding/varint"
+import "core:testing"
+import "core:fmt"
+import "core:os"
+
+TEST_count := 0
+TEST_fail  := 0
+
+when ODIN_TEST {
+	expect  :: testing.expect
+	log     :: testing.log
+} else {
+	expect  :: proc(t: ^testing.T, condition: bool, message: string, loc := #caller_location) {
+		TEST_count += 1
+		if !condition {
+			TEST_fail += 1
+			fmt.printf("[%v] %v\n", loc, message)
+			return
+		}
+	}
+	log     :: proc(t: ^testing.T, v: any, loc := #caller_location) {
+		fmt.printf("[%v] ", loc)
+		fmt.printf("log: %v\n", v)
+	}
+}
+
+main :: proc() {
+	t := testing.T{}
+
+	test_dwarf(&t)
+
+	fmt.printf("%v/%v tests successful.\n", TEST_count - TEST_fail, TEST_count)
+	if TEST_fail > 0 {
+		os.exit(1)
+	}
+}
+
+@(test)
+test_dwarf :: proc(t: ^testing.T) {
+	for vector in ULEB_Vectors {
+		val, size := varint.decode_uleb128(vector.encoded)
+
+		msg := fmt.tprintf("Expected %02x to decode to %v consuming %v bytes, got %v and %v", vector.encoded, vector.value, vector.size, val, size)
+		expect(t, size == vector.size && val == vector.value, msg)
+	}
+
+	for vector in ILEB_Vectors {
+		val, size := varint.decode_ileb128(vector.encoded)
+
+		msg := fmt.tprintf("Expected %02x to decode to %v consuming %v bytes, got %v and %v", vector.encoded, vector.value, vector.size, val, size)
+		expect(t, size == vector.size && val == vector.value, msg)
+	}
+}
+
+ULEB_Test_Vector :: struct {
+	encoded: []u8,
+	value:   u128,
+	size:    int,
+}
+
+ULEB_Vectors :: []ULEB_Test_Vector{
+	{ []u8{0x00},             0,      1 },
+    { []u8{0x7f},             127,    1 },
+	{ []u8{0xE5, 0x8E, 0x26}, 624485, 3 },
+    { []u8{0x80},             0,      0 },
+    { []u8{},                 0,      0 },
+}
+
+ILEB_Test_Vector :: struct {
+	encoded: []u8,
+	value:   i128,
+	size:    int,
+}
+
+ILEB_Vectors :: []ILEB_Test_Vector{
+	{ []u8{0x00},             0,       1 },
+	{ []u8{0xC0, 0xBB, 0x78}, -123456, 3 },
+    { []u8{},                 0,       0 },
+}