test: add unit test for read_*_leb128() functions (#5931)

Author: Farhan-25

test/unit/meson.build

@@ -88,6 +88,7 @@ if get_option('enable_tests')
     'io_ihex',
     'itv',
     'json',
+    'leb128',
     'list',
     'log',
     'lzma',

test/unit/test_leb128.c

@@ -0,0 +1,135 @@
+// SPDX-FileCopyrightText: 2026 Farhan-25 <shadowfinder1799@gmail.com>
+// SPDX-License-Identifier: LGPL-3.0-only
+
+#include <rz_util.h>
+#include "minunit.h"
+
+static bool test_read_u32_single_byte(void) {
+	ut8 buf[] = { 0x7f };
+	ut32 value = 0;
+
+	size_t n = read_u32_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "u32 single: wrong length");
+	mu_assert_eq(value, 127, "u32 single: wrong value");
+	mu_end;
+}
+
+static bool test_read_u32_multibyte(void) {
+	ut8 buf[] = { 0xE5, 0x8E, 0x26 };
+	ut32 value = 0;
+
+	size_t n = read_u32_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 3, "u32 multi: wrong length");
+	mu_assert_eq(value, 624485, "u32 multi: wrong value");
+	mu_end;
+}
+
+static bool test_read_i32_positive(void) {
+	ut8 buf[] = { 0x01 };
+	st32 value = 0;
+
+	size_t n = read_i32_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "i32 positive: wrong length");
+	mu_assert_eq(value, 1, "i32 positive: wrong value");
+	mu_end;
+}
+
+static bool test_read_i32_negative_one(void) {
+	ut8 buf[] = { 0x7f };
+	st32 value = 0;
+
+	size_t n = read_i32_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "i32 -1: wrong length");
+	mu_assert_eq(value, -1, "i32 -1: wrong value");
+	mu_end;
+}
+
+static bool test_read_i32_multibyte_negative(void) {
+	ut8 buf[] = { 0x9B, 0xF1, 0x59 };
+	st32 value = 0;
+
+	size_t n = read_i32_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 3, "i32 multi neg: wrong length");
+	mu_assert_eq(value, -624485, "i32 multi neg: wrong value");
+	mu_end;
+}
+
+static bool test_read_u64_single_byte(void) {
+	ut8 buf[] = { 0x7f };
+	ut64 value = 0;
+
+	size_t n = read_u64_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "u64 single: wrong length");
+	mu_assert_eq(value, 127ULL, "u64 single: wrong value");
+	mu_end;
+}
+
+static bool test_read_u64_multibyte(void) {
+	ut8 buf[] = { 0xE5, 0x8E, 0x26 };
+	ut64 value = 0;
+
+	size_t n = read_u64_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 3, "u64 multi: wrong length");
+	mu_assert_eq(value, 624485ULL, "u64 multi: wrong value");
+	mu_end;
+}
+
+static bool test_read_i64_positive(void) {
+	ut8 buf[] = { 0x01 };
+	st64 value = 0;
+
+	size_t n = read_i64_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "i64 positive: wrong length");
+	mu_assert_eq(value, 1LL, "i64 positive: wrong value");
+	mu_end;
+}
+
+static bool test_read_i64_negative_one(void) {
+	ut8 buf[] = { 0x7f };
+	st64 value = 0;
+
+	size_t n = read_i64_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 1, "i64 -1: wrong length");
+	mu_assert_eq(value, -1LL, "i64 -1: wrong value");
+	mu_end;
+}
+
+static bool test_read_i64_multibyte_negative(void) {
+	ut8 buf[] = { 0x9B, 0xF1, 0x59 };
+	st64 value = 0;
+
+	size_t n = read_i64_leb128(buf, buf + sizeof(buf), &value);
+
+	mu_assert_eq(n, 3, "i64 multi neg: wrong length");
+	mu_assert_eq(value, -624485LL, "i64 multi neg: wrong value");
+	mu_end;
+}
+
+static bool all_tests(void) {
+	mu_run_test(test_read_u32_single_byte);
+	mu_run_test(test_read_u32_multibyte);
+
+	mu_run_test(test_read_i32_positive);
+	mu_run_test(test_read_i32_negative_one);
+	mu_run_test(test_read_i32_multibyte_negative);
+
+	mu_run_test(test_read_u64_single_byte);
+	mu_run_test(test_read_u64_multibyte);
+
+	mu_run_test(test_read_i64_positive);
+	mu_run_test(test_read_i64_negative_one);
+	mu_run_test(test_read_i64_multibyte_negative);
+
+	return tests_passed != tests_run;
+}
+
+mu_main(all_tests)