1 files changed, 51 insertions, 0 deletions
diff --git a/src/utils/make_initrd.c b/src/utils/make_initrd.c
new file mode 100644
index 0000000..f6e504b
--- /dev/null
+++ b/src/utils/make_initrd.c
@@ -0,0 +1,51 @@
+#include <stdio.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", 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;
+}