mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-02 01:04:54 +00:00
101 lines
2.1 KiB
C++
101 lines
2.1 KiB
C++
//
|
|
// FileHolder.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 21/11/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "FileHolder.hpp"
|
|
|
|
#include <cstring>
|
|
|
|
using namespace Storage;
|
|
|
|
FileHolder::~FileHolder()
|
|
{
|
|
if(file_) fclose(file_);
|
|
}
|
|
|
|
FileHolder::FileHolder(const char *file_name) : file_(nullptr)
|
|
{
|
|
stat(file_name, &file_stats_);
|
|
is_read_only_ = false;
|
|
file_ = fopen(file_name, "rb+");
|
|
if(!file_)
|
|
{
|
|
is_read_only_ = true;
|
|
file_ = fopen(file_name, "rb");
|
|
}
|
|
if(!file_) throw ErrorCantOpen;
|
|
}
|
|
|
|
bool FileHolder::check_signature(const char *signature, size_t length)
|
|
{
|
|
if(!length) length = strlen(signature)+1;
|
|
|
|
// read and check the file signature
|
|
char stored_signature[12];
|
|
if(fread(stored_signature, 1, length, file_) != length) return false;
|
|
if(memcmp(stored_signature, signature, length)) return false;
|
|
return true;
|
|
}
|
|
|
|
uint32_t FileHolder::fgetc32le()
|
|
{
|
|
uint32_t result = (uint32_t)fgetc(file_);
|
|
result |= (uint32_t)(fgetc(file_) << 8);
|
|
result |= (uint32_t)(fgetc(file_) << 16);
|
|
result |= (uint32_t)(fgetc(file_) << 24);
|
|
|
|
return result;
|
|
}
|
|
|
|
uint32_t FileHolder::fgetc24le()
|
|
{
|
|
uint32_t result = (uint32_t)fgetc(file_);
|
|
result |= (uint32_t)(fgetc(file_) << 8);
|
|
result |= (uint32_t)(fgetc(file_) << 16);
|
|
|
|
return result;
|
|
}
|
|
|
|
uint16_t FileHolder::fgetc16le()
|
|
{
|
|
uint16_t result = (uint16_t)fgetc(file_);
|
|
result |= (uint16_t)(fgetc(file_) << 8);
|
|
|
|
return result;
|
|
}
|
|
|
|
uint32_t FileHolder::fgetc32be()
|
|
{
|
|
uint32_t result = (uint32_t)(fgetc(file_) << 24);
|
|
result |= (uint32_t)(fgetc(file_) << 16);
|
|
result |= (uint32_t)(fgetc(file_) << 8);
|
|
result |= (uint32_t)fgetc(file_);
|
|
|
|
return result;
|
|
}
|
|
|
|
uint16_t FileHolder::fgetc16be()
|
|
{
|
|
uint16_t result = (uint16_t)(fgetc(file_) << 8);
|
|
result |= (uint16_t)fgetc(file_);
|
|
|
|
return result;
|
|
}
|
|
|
|
void FileHolder::ensure_file_is_at_least_length(long length)
|
|
{
|
|
fseek(file_, 0, SEEK_END);
|
|
long bytes_to_write = length - ftell(file_);
|
|
if(bytes_to_write > 0)
|
|
{
|
|
uint8_t *empty = new uint8_t[bytes_to_write];
|
|
memset(empty, 0, (size_t)bytes_to_write);
|
|
fwrite(empty, sizeof(uint8_t), (size_t)bytes_to_write, file_);
|
|
delete[] empty;
|
|
}
|
|
}
|