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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct initrd_header
{
unsigned char magic;
char name[64];
unsigned int offset;
unsigned int length;
};
int main(char argc, char **argv)
{
int nheaders = (argc-1)/2;
struct initrd_header headers[64];
printf("size of header: %ld\n", sizeof(struct initrd_header));
unsigned int off = sizeof(struct initrd_header) * 64 + sizeof(int);
int i;
for(i = 0; i < nheaders; i++)
{
printf("writing file %s->%s at 0x%x\n", argv[i*2+1], argv[i*2+2], off);
strcpy(headers[i].name, argv[i*2+2]);
headers[i].name[strlen(argv[i*2+2])] = '\0';
headers[i].offset = off;
FILE *stream = fopen(argv[i*2+1], "r");
if(stream == 0)
{
printf("Error: file not found: %s\n", argv[i*2+1]);
return 1;
}
fseek(stream, 0, SEEK_END);
headers[i].length = ftell(stream);
off += headers[i].length;
fclose(stream);
headers[i].magic = 0xBF;
}
FILE *wstream = fopen("./initrd.img", "w");
unsigned char *data = (unsigned char *)malloc(off);
fwrite(&nheaders, sizeof(int), 1, wstream);
fwrite(headers, sizeof(struct initrd_header), 64, wstream);
for(i = 0; i < nheaders; i++)
{
FILE *stream = fopen(argv[i*2+1], "r");
unsigned char *buf = (unsigned char *)malloc(headers[i].length);
fread(buf, 1, headers[i].length, stream);
fwrite(buf, 1, headers[i].length, wstream);
fclose(stream);
free(buf);
}
fclose(wstream);
free(data);
return 0;
}
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