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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/. */
#include "databuffer.h"
#include <algorithm>
#include <cassert>
#include <cstring>
#include <iomanip>
#include <iostream>
#if defined(WIN32) || defined(WIN64)
#include <winsock2.h>
#else
#include <arpa/inet.h>
#endif
namespace nss_test {
void DataBuffer::Assign(const uint8_t* data, size_t len) {
if (data) {
Allocate(len);
memcpy(static_cast<void*>(data_), static_cast<const void*>(data), len);
} else {
assert(len == 0);
data_ = nullptr;
len_ = 0;
}
}
// 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 DataBuffer::Write(size_t index, const uint8_t* val, size_t count) {
assert(val);
if (index + count > len_) {
size_t newlen = index + count;
uint8_t* tmp = new uint8_t[newlen]; // Always > 0.
if (data_) {
memcpy(static_cast<void*>(tmp), static_cast<const void*>(data_), len_);
}
if (index > len_) {
memset(static_cast<void*>(tmp + len_), 0, index - len_);
}
delete[] data_;
data_ = tmp;
len_ = newlen;
}
if (data_) {
memcpy(static_cast<void*>(data_ + index), static_cast<const void*>(val),
count);
}
return index + count;
}
// Write an integer, also performing host-to-network order conversion.
// Returns the offset of the end of the write.
size_t DataBuffer::Write(size_t index, uint32_t val, size_t count) {
assert(count <= sizeof(uint32_t));
uint32_t nvalue = htonl(val);
auto* addr = reinterpret_cast<const uint8_t*>(&nvalue);
return Write(index, addr + sizeof(uint32_t) - count, count);
}
void DataBuffer::Splice(const uint8_t* ins, size_t ins_len, size_t index,
size_t remove) {
assert(ins);
uint8_t* old_value = data_;
size_t old_len = len_;
// The amount of stuff remaining from the tail of the old.
size_t tail_len = old_len - (std::min)(old_len, index + remove);
// The new length: the head of the old, the new, and the tail of the old.
len_ = index + ins_len + tail_len;
data_ = new uint8_t[len_ ? len_ : 1];
// The head of the old.
if (old_value) {
Write(0, old_value, (std::min)(old_len, index));
}
// Maybe a gap.
if (old_value && index > old_len) {
memset(old_value + index, 0, index - old_len);
}
// The new.
Write(index, ins, ins_len);
// The tail of the old.
if (tail_len > 0) {
Write(index + ins_len, old_value + index + remove, tail_len);
}
delete[] old_value;
}
// This can't use the same trick as Write(), since we might be reading from a
// smaller data source.
bool DataBuffer::Read(size_t index, size_t count, uint64_t* val) const {
assert(count <= sizeof(uint64_t));
assert(val);
if ((index > len()) || (count > (len() - index))) {
return false;
}
*val = 0;
for (size_t i = 0; i < count; ++i) {
*val = (*val << 8) | data()[index + i];
}
return true;
}
bool DataBuffer::Read(size_t index, size_t count, uint32_t* val) const {
assert(count <= sizeof(uint32_t));
uint64_t tmp;
if (!Read(index, count, &tmp)) {
return false;
}
*val = tmp & 0xffffffff;
return true;
}
size_t DataBuffer::logging_limit = 32;
/* static */ void DataBuffer::SetLogLimit(size_t limit) {
DataBuffer::logging_limit = limit;
}
} // namespace nss_test
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