34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
#include "initrd.h"
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#include <stdint.h>
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#include <lib/print.h>
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#include <lib/memory.h>
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void parse_cpio(void *initrd_start) {
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cpio_header_t *head = (cpio_header_t *)initrd_start;
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while (strncmp(head->c_magic, "070701", 6) == 0) {
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// If we hit the trailer, we are done
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char *filename = (char *)(head + 1);
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if (strncmp(filename, "TRAILER!!!", 10) == 0) {
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break;
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}
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uint32_t filesize = parse_hex(head->c_filesize);
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uint32_t namesize = parse_hex(head->c_namesize);
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kprintf("found file of size %d\n", filesize);
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// Calculate where the data begins (accounting for 4-byte padding)
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uint32_t header_plus_name = 110 + namesize;
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header_plus_name = (header_plus_name + 3) & ~3; // Align to 4 bytes
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char *file_data = (char *)head + header_plus_name;
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uint32_t total_record_size = header_plus_name + filesize;
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total_record_size = (total_record_size + 3) & ~3; // Align to 4 bytes
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head = (cpio_header_t *)((char *)head + total_record_size);
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}
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} |