clap

commit 5373682cca46905b4bdd3615398950bebf5aa938
parent 55efe851bebd645ad4233b7b6ace78878eaaaaf0
Author: Alexandre BIQUE <bique.alexandre@gmail.com>
Date:   Mon, 12 Jul 2021 18:05:30 +0200

Prepare a byte buffer class


Diffstat:
A
examples/plugins/buffer.hh
 | 
36
++++++++++++++++++++++++++++++++++++

1 file changed, 36 insertions(+), 0 deletions(-)
diff --git a/examples/plugins/buffer.hh b/examples/plugins/buffer.hh
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+namespace clap {
+   template <size_t CAPACITY>
+   class Buffer {
+
+      const uint8_t *readData() const noexcept { return &data_[roff_]; }
+      size_t readAvail() const noexcept { return woff_ - roff_; }
+      void read(size_t bytes) noexcept { roff_ += bytes; }
+
+      uint8_t *writeData() const noexcept { return &data_[woff_]; }
+      size_t writeAvail() const noexcept { return CAPACITY - woff_; }
+      void wrote(size_t bytes) noexcept { woff_ += bytes; }
+
+      void rewind() {
+         if (woff_ == 0)
+            return;
+
+         // this is inefficient but simple
+         // TODO: use scatter/gather IO
+         std::memmove(&data_[0], &data_[roff_], woff_ - roff_);
+         woff_ -= roff_;
+         roff_ = 0;
+      }
+
+      std::array<uint8_t, CAPACITY> data_;
+      size_t roff_ = 0;
+      size_t woff_ = 0;
+   };
+} // namespace clap
+\ No newline at end of file