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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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
*
* http://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.
*/
#ifndef CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_
#define CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
template <typename T, size_t N>
char (&ArraySizeHelper(T (&array)[N]))[N];
template <typename T, size_t N>
char (&ArraySizeHelper(const T (&array)[N]))[N];
#define arraysize(array) (sizeof(ArraySizeHelper(array)))
// Automatically close a file descriptor
class AutoCloseFileDescriptor {
public:
explicit AutoCloseFileDescriptor(int fd) : fd_(fd) { }
virtual ~AutoCloseFileDescriptor() {
if (fd_ != -1) {
(void)::close(fd_);
fd_ = -1;
}
}
operator int() const {
return fd_;
}
bool IsError() const {
return fd_ == -1;
}
// Close the underlying file descriptor, returning a status to give the caller
// the chance to act on failure to close.
// Returns true on success.
bool close() {
bool rval = true;
if (fd_ != -1) {
rval = !::close(fd_);
fd_ = -1;
}
return rval;
}
private:
AutoCloseFileDescriptor& operator=(const AutoCloseFileDescriptor & o);
explicit AutoCloseFileDescriptor(const AutoCloseFileDescriptor &);
int fd_;
};
// In C++11 this is just std::vector<char>, but Android isn't
// there yet.
class AutoFreeBuffer {
public:
enum {
// Minimum reserve size of AutoFreeBuffer to consider shrinking reservation.
// Any buffer shorter than this will not be shrunk.
kAutoBufferShrinkReserveThreshold = 8192
};
AutoFreeBuffer()
: data_(NULL), size_(0), reserve_size_(0) {}
AutoFreeBuffer(size_t reserve_size)
: data_(NULL), size_(0), reserve_size_(0) {
Reserve(reserve_size);
}
~AutoFreeBuffer();
void Clear();
bool Resize(size_t newsize);
bool Reserve(size_t newsize);
bool SetToString(const char* in);
bool Append(const void* new_data, size_t new_data_size);
size_t PrintF(const char* format, ... );
char* data() {
return data_;
}
const char* data() const {
return data_;
}
char* begin() {
return data_;
}
const char* begin() const {
return data_;
}
char* end() {
return data_ + size_;
}
const char* end() const {
return data_ + size_;
}
size_t size() const {
return size_;
}
size_t reserve_size() const {
return reserve_size_;
}
void Swap(AutoFreeBuffer& other) {
char* temp_ptr = data_;
data_ = other.data_;
other.data_ = temp_ptr;
size_t temp_size = size_;
size_ = other.size_;
other.size_ = temp_size;
temp_size = reserve_size_;
reserve_size_ = other.reserve_size_;
other.reserve_size_ = temp_size;
}
bool operator==(const AutoFreeBuffer& other) const {
return (size_ == other.size_) && !memcmp(data_, other.data_, size_);
}
bool operator!=(const AutoFreeBuffer& other) const {
return !(*this == other);
}
protected:
char *data_;
size_t size_;
size_t reserve_size_;
private:
AutoFreeBuffer& operator=(const AutoFreeBuffer&);
explicit AutoFreeBuffer(const AutoFreeBuffer&);
};
#endif // CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_
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