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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef databuffer_h__
#define databuffer_h__
#include <algorithm>
#include <cstring>
#include <iomanip>
#include <iostream>
namespace nss_test {
class DataBuffer {
public:
DataBuffer() : data_(nullptr), len_(0) {}
DataBuffer(const uint8_t* data, size_t len) : data_(nullptr), len_(0) {
Assign(data, len);
}
DataBuffer(const DataBuffer& other) : data_(nullptr), len_(0) {
Assign(other);
}
~DataBuffer() { delete[] data_; }
DataBuffer& operator=(const DataBuffer& other) {
if (&other != this) {
Assign(other);
}
return *this;
}
void Allocate(size_t len) {
delete[] data_;
data_ = new uint8_t[len ? len : 1]; // Don't depend on new [0].
len_ = len;
}
void Truncate(size_t len) { len_ = (std::min)(len_, len); }
void Assign(const DataBuffer& other) { Assign(other.data(), other.len()); }
void Assign(const uint8_t* data, size_t len);
// Write will do a new allocation and expand the size of the buffer if needed.
// Returns the offset of the end of the write.
size_t Write(size_t index, const uint8_t* val, size_t count);
size_t Write(size_t index, const DataBuffer& buf) {
return Write(index, buf.data(), buf.len());
}
// Write an integer, also performing host-to-network order conversion.
// Returns the offset of the end of the write.
size_t Write(size_t index, uint32_t val, size_t count);
// Starting at |index|, remove |remove| bytes and replace them with the
// contents of |buf|.
void Splice(const DataBuffer& buf, size_t index, size_t remove = 0) {
Splice(buf.data(), buf.len(), index, remove);
}
void Splice(const uint8_t* ins, size_t ins_len, size_t index,
size_t remove = 0);
void Append(const DataBuffer& buf) { Splice(buf, len_); }
bool Read(size_t index, size_t count, uint64_t* val) const;
bool Read(size_t index, size_t count, uint32_t* val) const;
const uint8_t* data() const { return data_; }
uint8_t* data() { return data_; }
size_t len() const { return len_; }
bool empty() const { return len_ == 0; }
static void SetLogLimit(size_t limit);
friend std::ostream& operator<<(std::ostream& stream, const DataBuffer& buf);
private:
static size_t logging_limit;
uint8_t* data_;
size_t len_;
};
inline std::ostream& operator<<(std::ostream& stream, const DataBuffer& buf) {
stream << "[" << buf.len() << "] ";
for (size_t i = 0; i < buf.len(); ++i) {
if (i >= DataBuffer::logging_limit) {
stream << "...";
break;
}
stream << std::hex << std::setfill('0') << std::setw(2)
<< static_cast<unsigned>(buf.data()[i]);
}
stream << std::dec;
return stream;
}
inline bool operator==(const DataBuffer& a, const DataBuffer& b) {
return (a.empty() && b.empty()) ||
(a.len() == b.len() && 0 == memcmp(a.data(), b.data(), a.len()));
}
inline bool operator!=(const DataBuffer& a, const DataBuffer& b) {
return !(a == b);
}
} // namespace nss_test
#endif
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