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stream.h
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// license:BSD-3-Clause
// copyright-holders:Nathan Woods
/***************************************************************************
stream.h
Code for implementing Imgtool streams
***************************************************************************/
#ifndef MAME_TOOLS_IMGTOOL_STREAM_H
#define MAME_TOOLS_IMGTOOL_STREAM_H
#pragma once
#include "utilfwd.h"
#include "osdcomm.h"
#include <cstdint>
#include <memory>
#include <string>
namespace imgtool {
class stream
{
public:
typedef std::unique_ptr<stream> ptr;
~stream();
static imgtool::stream::ptr open(const std::string &filename, int read_or_write); /* similar params to mame_fopen */
static imgtool::stream::ptr open_write_stream(int filesize);
static imgtool::stream::ptr open_mem(void *buf, size_t sz);
util::core_file *core_file();
uint32_t read(void *buf, uint32_t sz);
uint32_t write(const void *buf, uint32_t sz);
uint64_t size() const;
int seek(int64_t pos, int where);
uint64_t tell();
uint32_t putc(char c);
uint32_t puts(const char *s);
uint32_t printf(const char *fmt, ...) ATTR_PRINTF(2, 3);
// transfers sz bytes from source to dest
static uint64_t transfer(imgtool::stream &dest, imgtool::stream &source, uint64_t sz);
static uint64_t transfer_all(imgtool::stream &dest, imgtool::stream &source);
// fills sz bytes with b
uint64_t fill(unsigned char b, uint64_t sz);
// returns whether a stream is read only or not
bool is_read_only();
private:
enum imgtype_t
{
IMG_FILE,
IMG_MEM
};
imgtype_t imgtype;
bool write_protect;
std::uint64_t position;
std::uint64_t filesize;
std::unique_ptr<util::core_file> file;
std::uint8_t *buffer;
// ctors
stream(bool wp);
stream(bool wp, std::unique_ptr<util::core_file> &&f);
stream(bool wp, std::size_t size);
stream(bool wp, std::size_t size, void *buf);
// private methods
static stream::ptr open_zip(const std::string &zipname, const char *subname, int read_or_write);
};
std::unique_ptr<util::random_read> stream_read(stream::ptr &&s, std::uint8_t filler) noexcept;
std::unique_ptr<util::random_read> stream_read(stream &s, std::uint8_t filler) noexcept;
std::unique_ptr<util::random_read_write> stream_read_write(stream::ptr &&s, std::uint8_t filler) noexcept;
std::unique_ptr<util::random_read_write> stream_read_write(stream &s, std::uint8_t filler) noexcept;
} // namespace imgtool
#endif // MAME_TOOLS_IMGTOOL_STREAM_H