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/**
* @file initrd.h
* Initrd image support
* An archive file (made with ar) can be linked into the final executable to
* allow files to be loaded in memory on boot. See mkinitrd.sh or the Makefile
* for more info.
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef INITRD_H_
#define INITRD_H_
#include <stdint.h>
/**
* Structure for the archive's header.
*/
typedef struct
{
char signature[8]; /**< The archive's signature */
} __attribute__ ((packed)) initrd_header;
/**
* Structure for a file entry in the archive.
*/
typedef struct
{
char name[16]; /**< The name of the file */
uint8_t unused[32]; /**< Unused information */
char size[10]; /**< The file's size in bytes (as string) */
char sig[2]; /**< A signature to start file data */
} __attribute__ ((packed)) initrd_file;
/**
* Confirms the initrd image is loaded and valid.
* @return non-zero if valid image found
*/
uint8_t initrd_validate(void);
/**
* Gets contents of the given file.
* @param name the file's name
* @return pointer to file data, null if not found
*/
char *initrd_getfile(const char *name);
/**
* Gets the size of the given file.
* @param name the file's name
* @return the file's size, in bytes
*/
uint32_t initrd_getfilesize(const char *name);
#endif // INITRD_H_
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