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#include "files.h"
#include <bit>
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <stdexcept>
using std::cout, std::endl;
namespace TehImage
{
// HELPERS
void convertEndian(uint8_t* in, uint8_t* out, std::size_t bytes, FileEndianness target)
{
constexpr bool LE = std::endian::native == std::endian::little;
constexpr bool BE = !LE;
if(target == NO_CONVERT || (target == BIG && BE) || (target == LITTLE && LE))
{
for(int i = 0; i < bytes; i++)
{
out[i] = in[i];
}
return;
}
// std::cout << "Converting" << std::endl;
for(int i = 0; i < bytes; i++)
{
out[bytes - 1 - i] = in[i];
}
}
// READER
Reader::Reader(std::string filename, FileEndianness fileEndianness)
:fileEndianness(fileEndianness)
{
file = fopen(filename.c_str(), "rb");
refreshBuffer();
ready = true;
}
Reader::~Reader()
{
if(ready)
fclose(file);
}
char Reader::readByte()
{
if(pos == READER_BUFFER_SIZE)
refreshBuffer();
return buffer[pos++];
}
void Reader::refreshBuffer()
{
fread(buffer, sizeof(buffer), 1, file);
pos = 0;
}
template<> uint8_t Reader::readData<uint8_t>()
{
return readByte();
}
DEFINE_INT_READER(uint16_t);
DEFINE_INT_READER(uint32_t);
DEFINE_INT_READER(uint64_t);
void Reader::readBytes(char* out, size_t len)
{
while(len > 0)
{
size_t bytesToRead = std::min(len, READER_BUFFER_SIZE - pos);
if(bytesToRead == 0)
{
refreshBuffer();
continue;
}
memcpy(out, buffer + pos, bytesToRead);
out += bytesToRead;
len -= bytesToRead;
pos += bytesToRead;
}
}
void Reader::skipBytes(size_t len)
{
while(len > 0)
{
size_t bytesToRead = std::min(len, READER_BUFFER_SIZE - pos);
if(bytesToRead == 0)
{
refreshBuffer();
continue;
}
len -= bytesToRead;
pos += bytesToRead;
}
}
void Reader::close()
{
fclose(file);
ready = false;
}
// WRITER
Writer::Writer(std::string filename, FileEndianness fileEndianness)
:fileEndianness(fileEndianness)
{
file = fopen(filename.c_str(), "w");
pos = 0;
ready = true;
}
Writer::~Writer()
{
close();
}
void Writer::writeByte(char toWrite)
{
if(pos == WRITER_BUFFER_SIZE)
throw std::out_of_range("Writer buffer ran out single-byte!!!");
buffer[pos++] = toWrite;
}
void Writer::writeBytes(char toWrite[], std::size_t len)
{
if(pos + len > WRITER_BUFFER_SIZE)
throw std::out_of_range("Writer buffer ran out multi-byte!!!");
memcpy(&(buffer[pos]), toWrite, len);
pos += len;
}
void Writer::zeroBytes(std::size_t len)
{
char *zeroes = new char[len];
memset(zeroes, 0, len);
writeBytes(zeroes, len);
delete[] zeroes;
}
void Writer::close()
{
if(ready)
{
flushBuffer();
fclose(file);
}
ready = false;
}
void Writer::flushBuffer()
{
if(!ready)
throw std::logic_error("Cannot flush buffer before opening file");
fwrite(buffer, sizeof(char), pos, file);
pos = 0;
}
template <> void Writer::writeData(uint8_t toWrite)
{
writeByte(toWrite);
}
DEFINE_INT_WRITER(uint16_t);
DEFINE_INT_WRITER(uint32_t);
DEFINE_INT_WRITER(uint64_t);
}
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