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// Copyright Notice (GNU Affero GPL) {{{
/* Cyndir - (Awesome) Memory Mapped Dictionary
* Copyright (C) 2010 Jay Freeman (saurik)
*/
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// }}}
#ifndef CYTORE_HPP
#define CYTORE_HPP
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <cstdio>
#include <cstdlib>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#define _assert(test) do \
if (!(test)) { \
fprintf(stderr, "_assert(%d:%s)@%s:%u[%s]\n", errno, #test, __FILE__, __LINE__, __FUNCTION__); \
exit(-1); \
} \
while (false)
namespace Cytore {
static const uint32_t Magic = 'cynd';
struct Header {
uint32_t magic_;
uint32_t version_;
uint32_t size_;
uint32_t reserved_;
};
template <typename Target_>
class Offset {
private:
uint32_t offset_;
public:
Offset() :
offset_(0)
{
}
Offset(uint32_t offset) :
offset_(offset)
{
}
Offset &operator =(uint32_t offset) {
offset_ = offset;
return *this;
}
uint32_t GetOffset() const {
return offset_;
}
bool IsNull() const {
return offset_ == 0;
}
};
struct Block {
Cytore::Offset<void> reserved_;
};
template <typename Type_>
static _finline Type_ Round(Type_ value, Type_ size) {
Type_ mask(size - 1);
return value + mask & ~mask;
}
template <typename Base_>
class File {
private:
static const unsigned Shift_ = 17;
static const size_t Block_ = 1 << Shift_;
static const size_t Mask_ = Block_ - 1;
private:
int file_;
typedef std::vector<uint8_t *> BlockVector_;
BlockVector_ blocks_;
struct Mapping_ {
uint8_t *data_;
size_t size_;
Mapping_(uint8_t *data, size_t size) :
data_(data),
size_(size)
{
}
};
typedef std::vector<Mapping_> MappingVector_;
MappingVector_ maps_;
Header &Header_() {
return *reinterpret_cast<Header *>(blocks_[0]);
}
uint32_t &Size_() {
return Header_().size_;
}
void Map_(size_t size) {
size_t before(blocks_.size() * Block_);
size_t extend(size - before);
void *data(mmap(NULL, extend, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, file_, before));
uint8_t *bytes(reinterpret_cast<uint8_t *>(data));
maps_.push_back(Mapping_(bytes,extend));
for (size_t i(0); i != extend >> Shift_; ++i)
blocks_.push_back(bytes + Block_ * i);
}
void Truncate_(size_t capacity) {
capacity = Round(capacity, Block_);
ftruncate(file_, capacity);
Map_(capacity);
}
public:
File() :
file_(-1)
{
}
File(const char *path) :
file_(-1)
{
Open(path);
}
~File() {
for (typename MappingVector_::const_iterator map(maps_.begin()); map != maps_.end(); ++map)
munmap(map->data_, map->size_);
close(file_);
}
void Sync() {
for (typename MappingVector_::const_iterator map(maps_.begin()); map != maps_.end(); ++map)
msync(map->data_, map->size_, MS_SYNC);
}
size_t Capacity() const {
return blocks_.size() * Block_;
}
void Open(const char *path) {
_assert(file_ == -1);
file_ = open(path, O_RDWR | O_CREAT | O_EXLOCK, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
struct stat stat;
fstat(file_, &stat);
size_t core(sizeof(Header) + sizeof(Base_));
size_t size(stat.st_size);
if (size == 0) {
Truncate_(core);
Header_().magic_ = Magic;
Size_() = core;
} else {
_assert(size >= core);
Truncate_(size);
_assert(Header_().magic_ == Magic);
_assert(Header_().version_ == 0);
}
}
void Reserve(size_t capacity) {
if (capacity <= Capacity())
return;
blocks_.pop_back();
Truncate_(capacity);
}
template <typename Target_>
Target_ &Get(uint32_t offset) {
return *reinterpret_cast<Target_ *>(blocks_[offset >> Shift_] + (offset & Mask_));
}
template <typename Target_>
Target_ &Get(Offset<Target_> &ref) {
return Get<Target_>(ref.GetOffset());
}
Base_ *operator ->() {
return &Get<Base_>(sizeof(Header));
}
template <typename Target_>
Offset<Target_> New(size_t extra = 0) {
size_t size(sizeof(Target_) + extra);
size = Round(size, sizeof(uintptr_t));
Reserve(Size_() + size);
uint32_t offset(Size_());
Size_() += size;
return Offset<Target_>(offset);
}
};
}
#endif//CYTORE_HPP
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