pw_bytes: Module for bytes manipulation.
Added a ByteBuffer module which contains a collection of utilities for
manipulating binary data.
Change-Id: Ia071c3e68a1ada63232fcb56f3d2d8171bac0778
diff --git a/pw_bytes/byte_builder.cc b/pw_bytes/byte_builder.cc
new file mode 100644
index 0000000..80e74d2
--- /dev/null
+++ b/pw_bytes/byte_builder.cc
@@ -0,0 +1,71 @@
+// Copyright 2020 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "pw_bytes/byte_builder.h"
+
+namespace pw {
+
+void ByteBuilder::clear() {
+ size_ = 0;
+ status_ = Status::OK;
+ last_status_ = Status::OK;
+}
+
+ByteBuilder& ByteBuilder::append(size_t count, std::byte b) {
+ std::byte* const append_destination = &buffer_[size_];
+
+ std::memset(append_destination, static_cast<int>(b), ResizeForAppend(count));
+ return *this;
+}
+
+ByteBuilder& ByteBuilder::append(const void* bytes, size_t count) {
+ std::byte* const append_destination = &buffer_[size_];
+ std::memcpy(append_destination, bytes, ResizeForAppend(count));
+ return *this;
+}
+
+size_t ByteBuilder::ResizeForAppend(size_t bytes_to_append) {
+ const size_t copied = std::min(bytes_to_append, max_size() - size());
+ size_ += copied;
+
+ if (buffer_.empty() || bytes_to_append != copied) {
+ SetErrorStatus(Status::RESOURCE_EXHAUSTED);
+ } else {
+ last_status_ = Status::OK;
+ }
+
+ return copied;
+}
+
+void ByteBuilder::resize(size_t new_size) {
+ if (new_size <= size_) {
+ size_ = new_size;
+ last_status_ = Status::OK;
+ } else {
+ SetErrorStatus(Status::OUT_OF_RANGE);
+ }
+}
+
+void ByteBuilder::CopySizeAndStatus(const ByteBuilder& other) {
+ size_ = other.size_;
+ status_ = other.status_;
+ last_status_ = other.last_status_;
+}
+
+void ByteBuilder::SetErrorStatus(Status status) {
+ last_status_ = status;
+ status_ = status;
+}
+
+} // namespace pw
