feat: added functionallity for TCP stream reassembly

1 files changed, 41 insertions, 0 deletions

diff --git a/analyzer/utils/tcp_seq_math.c b/analyzer/utils/tcp_seq_math.c
new file mode 100644
index 0000000..272cb5a
--- /dev/null
+++ b/analyzer/utils/tcp_seq_math.c
@@ -0,0 +1,41 @@
+#include "tcp_seq_math.h"
+
+int seq_after(uint32_t a, uint32_t b) {
+    return (int32_t)(a - b) > 0;
+}
+
+int seq_before(uint32_t a, uint32_t b) {
+    return (int32_t)(a - b) < 0;
+}
+
+int seq_after_eq(uint32_t a, uint32_t b) {
+    return (int32_t)(a - b) >= 0;
+}
+
+int seq_before_eq(uint32_t a, uint32_t b) {
+    return (int32_t)(a - b) <= 0;
+}
+
+int seq_in_range_ii(uint32_t value, uint32_t range_start, uint32_t range_end) {
+    int after_eq = seq_after_eq(value, range_start);
+    int before_eq = seq_before_eq(value, range_end);
+    return after_eq && before_eq;
+}
+
+int seq_in_range_ee(uint32_t value, uint32_t range_start, uint32_t range_end) {
+    int after = seq_after(value, range_start);
+    int before = seq_before(value, range_end);
+    return after && before;
+}
+
+int seq_in_range_ie(uint32_t value, uint32_t range_start, uint32_t range_end) {
+    int after_eq = seq_after_eq(value, range_start);
+    int before = seq_before(value, range_end);
+    return after_eq && before;
+}
+
+int seq_in_range_ei(uint32_t value, uint32_t range_start, uint32_t range_end) {
+    int after = seq_after(value, range_start);
+    int before_eq = seq_before_eq(value, range_end);
+    return after && before_eq;
+}