initial code dump

src/varnum.c

@@ -0,0 +1,49 @@
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+#include "varnum.h"
+#include "globals.h"
+#include "tools.h"
+
+int32_t readVarInt (int client_fd) {
+  int32_t value = 0;
+  int position = 0;
+  uint8_t byte;
+
+  while (true) {
+    byte = readByte(client_fd);
+    if (recv_count != 1) return VARNUM_ERROR;
+
+    value |= (byte & SEGMENT_BITS) << position;
+
+    if ((byte & CONTINUE_BIT) == 0) break;
+
+    position += 7;
+    if (position >= 32) return VARNUM_ERROR;
+  }
+
+  return value;
+}
+
+int sizeVarInt (uint32_t value) {
+  int size = 1;
+  while ((value & ~SEGMENT_BITS) != 0) {
+    value >>= 7;
+    size ++;
+  }
+  return size;
+}
+
+void writeVarInt (int client_fd, uint32_t value) {
+  while (true) {
+    if ((value & ~SEGMENT_BITS) == 0) {
+      writeByte(client_fd, value);
+      return;
+    }
+
+    writeByte(client_fd, (value & SEGMENT_BITS) | CONTINUE_BIT);
+
+    value >>= 7;
+  }
+}