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CLK/Storage/FileHolder.cpp

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//
// FileHolder.cpp
// Clock Signal
//
// Created by Thomas Harte on 21/11/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#include "FileHolder.hpp"
#include <algorithm>
#include <cstring>
using namespace Storage;
FileHolder::~FileHolder() {
if(file_) std::fclose(file_);
}
FileHolder::FileHolder(const std::string &file_name, FileMode ideal_mode)
: name_(file_name) {
stat(file_name.c_str(), &file_stats_);
is_read_only_ = false;
switch(ideal_mode) {
case FileMode::ReadWrite:
file_ = std::fopen(file_name.c_str(), "rb+");
if(file_) break;
is_read_only_ = true;
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[[fallthrough]];
case FileMode::Read:
file_ = std::fopen(file_name.c_str(), "rb");
break;
case FileMode::Rewrite:
file_ = std::fopen(file_name.c_str(), "w");
break;
}
if(!file_) throw Error::CantOpen;
}
uint32_t FileHolder::get32le() {
uint32_t result = uint32_t(std::fgetc(file_));
result |= uint32_t(std::fgetc(file_)) << 8;
result |= uint32_t(std::fgetc(file_)) << 16;
result |= uint32_t(std::fgetc(file_)) << 24;
return result;
}
uint32_t FileHolder::get32be() {
uint32_t result = uint32_t(std::fgetc(file_)) << 24;
result |= uint32_t(std::fgetc(file_)) << 16;
result |= uint32_t(std::fgetc(file_)) << 8;
result |= uint32_t(std::fgetc(file_));
return result;
}
uint32_t FileHolder::get24le() {
uint32_t result = uint32_t(std::fgetc(file_));
result |= uint32_t(std::fgetc(file_)) << 8;
result |= uint32_t(std::fgetc(file_)) << 16;
return result;
}
uint32_t FileHolder::get24be() {
uint32_t result = uint32_t(std::fgetc(file_)) << 16;
result |= uint32_t(std::fgetc(file_)) << 8;
result |= uint32_t(std::fgetc(file_));
return result;
}
uint16_t FileHolder::get16le() {
uint16_t result = uint16_t(std::fgetc(file_));
result |= uint16_t(uint16_t(std::fgetc(file_)) << 8);
return result;
}
uint16_t FileHolder::get16be() {
uint16_t result = uint16_t(uint16_t(std::fgetc(file_)) << 8);
result |= uint16_t(std::fgetc(file_));
return result;
}
uint8_t FileHolder::get8() {
return uint8_t(std::fgetc(file_));
}
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void FileHolder::put16be(uint16_t value) {
std::fputc(value >> 8, file_);
std::fputc(value, file_);
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}
void FileHolder::put16le(uint16_t value) {
std::fputc(value, file_);
std::fputc(value >> 8, file_);
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}
void FileHolder::put8(uint8_t value) {
std::fputc(value, file_);
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}
void FileHolder::putn(std::size_t repeats, uint8_t value) {
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while(repeats--) put8(value);
}
std::vector<uint8_t> FileHolder::read(std::size_t size) {
std::vector<uint8_t> result(size);
result.resize(std::fread(result.data(), 1, size, file_));
return result;
}
std::size_t FileHolder::read(uint8_t *buffer, std::size_t size) {
return std::fread(buffer, 1, size, file_);
}
std::size_t FileHolder::write(const std::vector<uint8_t> &buffer) {
return std::fwrite(buffer.data(), 1, buffer.size(), file_);
}
std::size_t FileHolder::write(const uint8_t *buffer, std::size_t size) {
return std::fwrite(buffer, 1, size, file_);
}
void FileHolder::seek(long offset, int whence) {
std::fseek(file_, offset, whence);
}
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long FileHolder::tell() const {
return std::ftell(file_);
}
void FileHolder::flush() {
std::fflush(file_);
}
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bool FileHolder::eof() const {
return std::feof(file_);
}
FileHolder::BitStream FileHolder::get_bitstream(bool lsb_first) {
return BitStream(file_, lsb_first);
}
bool FileHolder::check_signature(const char *signature, std::size_t length) {
if(!length) length = std::strlen(signature);
// read and check the file signature
std::vector<uint8_t> stored_signature = read(length);
if(stored_signature.size() != length) return false;
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if(std::memcmp(stored_signature.data(), signature, length)) return false;
return true;
}
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std::string FileHolder::extension() const {
std::size_t pointer = name_.size() - 1;
while(pointer > 0 && name_[pointer] != '.') pointer--;
if(name_[pointer] == '.') pointer++;
std::string extension = name_.substr(pointer);
std::transform(extension.begin(), extension.end(), extension.begin(), ::tolower);
return extension;
}
void FileHolder::ensure_is_at_least_length(long length) {
std::fseek(file_, 0, SEEK_END);
long bytes_to_write = length - ftell(file_);
if(bytes_to_write > 0) {
std::vector<uint8_t> empty(size_t(bytes_to_write), 0);
std::fwrite(empty.data(), sizeof(uint8_t), size_t(bytes_to_write), file_);
}
}
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bool FileHolder::get_is_known_read_only() const {
return is_read_only_;
}
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const struct stat &FileHolder::stats() const {
return file_stats_;
}
std::mutex &FileHolder::get_file_access_mutex() {
return file_access_mutex_;
}