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/**
* @file initrd.c
* Initrd image support
*
* 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/>.
*/
/**
* The format of the initrd file is custom; made with the 'rba' utility.
*/
#include <initrd.h>
#include <heap.h>
#include <string.h>
extern uint8_t _binary_initrd_img_start[];
extern uint8_t _binary_initrd_img_size[];
static const uint8_t *initrd_start = (uint8_t *)_binary_initrd_img_start;
static const uint32_t initrd_size = (uint32_t)_binary_initrd_img_size;
uint8_t initrd_validate(void)
{
return 1; // TODO maybe add header/signature to archiver?
}
char *initrd_getfile(uint32_t offset)
{
char *ptr = initrd_start;
for (uint32_t i = 0; i < offset; i++) {
uint32_t len = *((uint32_t *)ptr);
uint32_t datalen = *((uint32_t *)(ptr + 4 + len));
ptr += len + datalen + 8;
if (ptr >= (char *)(initrd_start + initrd_size))
return 0;
}
return ptr;
}
char *initrd_getname(uint32_t offset)
{
char *file = initrd_getfile(offset);
if (file == 0)
return 0;
uint32_t len = *((uint32_t *)file);
char *buf = malloc(len + 1);
strncpy(buf, file + 4, len);
buf[len] = '\0';
return buf;
}
char *initrd_readfile(const char *name)
{
char *ptr;
for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
uint32_t len = *((uint32_t *)ptr);
if (!strncmp(name, ptr + 4, len))
return ptr + len + 8;
}
return 0;
}
uint32_t initrd_filesize(const char *name)
{
char *ptr;
for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
uint32_t len = *((uint32_t *)ptr);
if (!strncmp(name, ptr + 4, len))
return *((uint32_t *)(ptr + len + 4));
}
return 0;
}
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