Lots of file splits

buffer.cpp

@@ -0,0 +1,66 @@
+#include "buffer.h"
+
+ConstBuffer::ConstBuffer(const char *buf, size_t len)
+		: const_buf_(buf),
+		  len_(len) {}
+
+size_t ConstBuffer::ReadMaxLen() const {
+	return len_ - start_;
+}
+
+const char *ConstBuffer::Read(size_t len) {
+	CHECK_LE(len, ReadMaxLen());
+	const auto *ret = &const_buf_[start_];
+	start_ += len;
+	return ret;
+}
+
+bool ConstBuffer::Discard(size_t len) {
+	if (len > ReadMaxLen()) {
+		return false;
+	}
+	Read(len);
+	return true;
+}
+
+void ConstBuffer::ResetRead() {
+	start_ = commit_;
+}
+
+void ConstBuffer::Commit() {
+	commit_ = start_;
+}
+
+
+Buffer::Buffer(char *buf, size_t size, size_t len)
+		: ConstBuffer(buf, size),
+		  buf_(buf),
+		  size_(size) {
+	len_ = len;
+}
+
+Buffer::Buffer(size_t size)
+		: Buffer((own_buf_.reset(new char[size]), own_buf_.get()), size, 0) {}
+
+char *Buffer::WritePtr() {
+	return &buf_[len_];
+}
+
+size_t Buffer::WriteMaxLen() const {
+	return size_ - len_;
+}
+
+void Buffer::Wrote(size_t len) {
+	CHECK_LE(len, WriteMaxLen());
+	len_ += len;
+}
+
+void Buffer::Consume() {
+	if (commit_ == 0) {
+		return;
+	}
+	memmove(buf_, &buf_[commit_], len_ - commit_);
+	len_ -= commit_;
+	start_ -= commit_;
+	commit_ = 0;
+}