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