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100 lines
2.5 KiB
C++
100 lines
2.5 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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if(file_) fclose(file_);
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}
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FileHolder::FileHolder(const std::string &file_name) : file_(nullptr), name_(file_name) {
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stat(file_name.c_str(), &file_stats_);
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is_read_only_ = false;
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file_ = fopen(file_name.c_str(), "rb+");
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if(!file_) {
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is_read_only_ = true;
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file_ = fopen(file_name.c_str(), "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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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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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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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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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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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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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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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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uint8_t *empty = new uint8_t[(size_t)bytes_to_write];
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memset(empty, 0, (size_t)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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std::string FileHolder::extension() {
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size_t pointer = name_.size() - 1;
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while(pointer > 0 && name_[pointer] != '.') pointer--;
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if(name_[pointer] == '.') pointer++;
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std::string extension = name_.substr(pointer);
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std::transform(extension.begin(), extension.end(), extension.begin(), ::tolower);
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return extension;
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}
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