a2f2c74fcf
Add support for multiple controllers and device types. Make Genode to Libretro input mapping configurable, which relieves the need to externally remap Genode keycodes to conform to static Libretro mapping. Send keyboard input to a optional keyboard callback set by the core to complete keyboard support. Ref #89
97 lines
1.8 KiB
C++
97 lines
1.8 KiB
C++
/*
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* \brief Libretro persistent memory file
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* \author Emery Hemingway
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* \date 2017-11-17
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _RETRO_FRONTEND__MEMORY_H_
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#define _RETRO_FRONTEND__MEMORY_H_
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/* Libc includes */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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namespace Retro_frontend {
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struct Memory_file
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{
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void *data = nullptr;
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size_t size = 0;
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unsigned const id;
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char const *path;
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int fd = -1;
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Genode::size_t file_size()
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{
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struct stat s;
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s.st_size = 0;
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stat(path, &s);
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return s.st_size;
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}
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bool open_file_for_data()
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{
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if (!(data && size))
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return false;
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if (fd == -1)
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fd = ::open(path, O_RDWR|O_CREAT);
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return fd != -1;
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}
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Memory_file(unsigned id, char const *filename)
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: id(id), path(filename)
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{ }
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~Memory_file() { if (fd != -1) close(fd); }
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void read()
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{
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if (open_file_for_data()) {
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lseek(fd, 0, SEEK_SET);
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size_t remain = Genode::min(size, file_size());
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size_t offset = 0;
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do {
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ssize_t n = ::read(fd, ((char*)data)+offset, remain);
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if (n == -1) {
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Genode::error("failed to read from ", path);
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break;
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}
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remain -= n;
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offset += n;
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} while (remain);
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}
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}
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void write()
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{
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if (open_file_for_data()) {
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lseek(fd, 0, SEEK_SET);
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ftruncate(fd, size);
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size_t remain = size;
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size_t offset = 0;
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do {
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ssize_t n = ::write(fd, ((char const *)data)+offset, remain);
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if (n == -1) {
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Genode::error("failed to write to ", path);
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break;
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}
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remain -= n;
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offset += n;
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} while (remain);
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}
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}
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};
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}
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#endif
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