55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* This program comes from James Molloy tutorial
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* on how to create an UNIX clone You can find the original code at:
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* http://www.jamesmolloy.co.uk/tutorial_html/8.-The%20VFS%20and%20the%20initrd.html */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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struct initrd_header {
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unsigned char magic; // Magic number for consistency
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char name[64];
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unsigned int offset; // Offset of the file start
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unsigned int length;
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};
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int main(int argc, char **argv) {
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int heads = (argc - 1) / 2;
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struct initrd_header headers[64];
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printf("Size of header(in bytes): %ld\n", sizeof(struct initrd_header));
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unsigned int off = sizeof(struct initrd_header) * 64 + sizeof(int);
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for(int i = 0; i < heads; i++) {
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printf("Writing file %s->%s at 0x%d\n", argv[i*2+1], argv[i*2+2], off);
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strcpy(headers[i].name, argv[i*2+2]);
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headers[i].offset = off;
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FILE *stream = fopen(argv[i*2+1], "r");
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if(stream == 0) {
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puts("Error, file not found!");
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return 1;
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}
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fseek(stream, 0, SEEK_END);
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headers[i].length = ftell(stream);
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off += headers[i].length;
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fclose(stream);
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headers[i].magic = 0xBF;
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}
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FILE *wstream = fopen("./initrd.img", "w");
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unsigned char *data = (unsigned char*)malloc(off);
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fwrite(&heads, sizeof(int), 1, wstream);
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fwrite(&heads, sizeof(struct initrd_header), 64, wstream);
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for(int i = 0; i < heads; i++) {
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FILE *stream = fopen(argv[i*2+1], "r");
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unsigned char *buf = (unsigned char*)malloc(headers[i].length);
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fread(buf, 1, headers[i].length, stream);
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fread(buf, 1, headers[i].length, wstream);
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fclose(stream);
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free(buf);
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}
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fclose(wstream);
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free(data);
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return 0;
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} |