Fix some of the comments on StreamBuffer

luprex/core/cpp/streambuffer.cpp

@@ -89,6 +89,13 @@ void StreamBuffer::make_space_slow(int64_t bytes) {
     write_cursor_ = buf_lo_ + data_size;
 }
 
+void StreamBuffer::wrote_space(int64_t bytes) {
+    int64_t available = buf_hi_ - write_cursor_;
+    assert(bytes >= 0);
+    assert(available >= bytes);
+    write_cursor_ += bytes;
+}
+
 char *StreamBuffer::get_overwrite(int64_t size, int64_t write_count_after) {
     int64_t write_count_before = write_count_after - size;
     assert(write_count_before >= total_reads());
@@ -159,7 +166,6 @@ static inline bool safe_to_cast_to_uint64(uint64_t vv) {
     return true;
 }
 
-
 void StreamBuffer::write_bytes(const char *s, int64_t len) {
     make_space(len);
     memcpy(write_cursor_, s, len);