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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: %d\n", (int) sizeof(struct initrd_header));
unsigned int off = sizeof(struct initrd_header) * 64 + sizeof(int);
for (int 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 (int 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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