#include <fcntl.h>
#include <unistd.h>

#include "disk_backend_file.h"
#include "log.h"


disk_backend_file::disk_backend_file(const std::string & filename) :
	fd(open(filename.c_str(), O_RDWR))
{
}

disk_backend_file::~disk_backend_file()
{
	close(fd);
}

bool disk_backend_file::read(const off_t offset, const size_t n, uint8_t *const target)
{
	DOLOG(debug, false, "disk_backend_file::read: read %zu bytes from offset %zu", n, offset);

	return pread(fd, target, n, offset) == ssize_t(n);
}

bool disk_backend_file::write(const off_t offset, const size_t n, const uint8_t *const from)
{
	DOLOG(debug, false, "disk_backend_file::write: write %zu bytes to offset %zu", n, offset);

	return pwrite(fd, from, n, offset) == ssize_t(n);
}