86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
#include "../kernel/vfs.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <klog.h>
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static char** names;
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static uint32_t* offsets;
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static unsigned long* sizes;
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static uint32_t num_files;
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static FILE* initrd_fd;
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static char drv(fs_op op,FILE* stream,void* data1,void* data2) {
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if (op==FSOP_MOUNT) {
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return 1;
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}
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if (op==FSOP_OPEN) {
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char file_exists=0;
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for (uint32_t i=0;i<num_files;i++) {
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if (strcmp(names[i],stream->path)==0) {
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file_exists=1;
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}
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}
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return file_exists;
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}
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if (op==FSOP_GETC) {
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uint32_t i;
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for (i=0;i<num_files;i++) {
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if (strcmp(names[i],stream->path)==0) {
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break;
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}
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}
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if (stream->pos>=sizes[i]) {
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*((int*)data1)=EOF;
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stream->eof=1;
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return 1;
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}
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fseek(initrd_fd,offsets[i]+stream->pos,SEEK_SET);
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*((int*)data1)=fgetc(initrd_fd);
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stream->pos+=1;
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return 1;
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}
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if (op==FSOP_CLOSE) {
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return 1;
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}
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return 0;
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}
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void initrd_init() {
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initrd_fd=fopen("/dev/initrd","r");
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if (!initrd_fd) {
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klog("PANIC","Cannot open initrd!");
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for(;;) {}
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}
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uint32_t max_files=32;
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num_files=0;
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names=malloc(sizeof(char*)*32);
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offsets=malloc(sizeof(uint32_t)*32);
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sizes=malloc(sizeof(long)*32);
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for (uint32_t i=0;;i++) {
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if (i==max_files) {
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names=realloc(names,sizeof(char*)*(max_files+32));
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offsets=realloc(offsets,sizeof(uint32_t)*(max_files+32));
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sizes=realloc(sizes,sizeof(long)*(max_files+32));
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max_files+=32;
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}
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uint32_t name_size;
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fread(&name_size,4,1,initrd_fd);
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if (name_size==0) {
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break;
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}
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char* name=malloc(sizeof(char)*(name_size+1));
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fread(name,1,name_size+1,initrd_fd);
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long contents_size;
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fread(&contents_size,4,1,initrd_fd);
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long datapos=ftell(initrd_fd);
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fseek(initrd_fd,contents_size,SEEK_CUR);
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names[i]=name;
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offsets[i]=datapos;
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sizes[i]=contents_size;
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num_files++;
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}
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fseek(initrd_fd,0,SEEK_SET);
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register_fs(drv,"initrd");
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}
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