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#include <stdint.h>
#include <string.h>
#include <kernel/heap.h>
#include <kernel/vfs.h>
typedef struct {
char *address;
uint32_t pos;
uint32_t size;
} initrd_info;
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;
void *initrd_open(const char *file);
uint32_t initrd_read(void *info, uint32_t count, uint8_t *buffer);
char *initrd_getfile(uint32_t offset);
static const vfs_volume_funcs initrd_funcs = {
initrd_open,
0, // close
initrd_read,
0, // write
0 // readdir
};
void initrd_init(void)
{
vfs_mount(&initrd_funcs, VFS_READONLY);
}
void *initrd_open(const char *file)
{
char *ptr;
for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
uint32_t len = *((uint32_t *)ptr);
if (!strncmp(file, ptr + 4, len)) {
initrd_info *file = (initrd_info *)malloc(
sizeof(initrd_info));
file->address = ptr + len + 8;
file->pos = 0;
file->size = *(uint32_t *)(ptr + len + 4);
return file;
}
}
return 0;
}
uint32_t initrd_read(void *info, uint32_t count, uint8_t *buffer)
{
initrd_info *iinfo = (initrd_info *)info;
if (iinfo == 0 || iinfo->address == 0)
return 0;
uint32_t i;
for (i = 0; i < count; i++) {
if (iinfo->pos >= iinfo->size)
break;
buffer[iinfo->pos] = iinfo->address[iinfo->pos];
iinfo->pos++;
}
return i;
}
/*char *readfile(const char *name)
{
char *ptr;
for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
uint32_t len = *((uint32_t *)ptr);
if (!strncmp(name, ptr + 4, len))
return ptr + len + 8;
}
return 0;
}*/
char *initrd_getfile(uint32_t offset)
{
char *ptr = (char *)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;
}
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