Chloe M.
141 lines
2.7 KiB
C
141 lines
2.7 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: CUMHOLE extraction module
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* Author: Chloe M.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stddef.h>
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#define REF_MAGIC "CUMHOLE"
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#define REF_MAGIC_LEN 8
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#define REF_PATH_LEN 256
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/*
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* The offset table is made up of references, this
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* structure represents a reference.
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*
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* @magic: Reference magic number
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* @path: Path this reference refers to
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* @size: Size of data being referenced
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* @data_off: Offset to data being referenced
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*/
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struct hole_ref {
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char magic[REF_MAGIC_LEN];
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char path[REF_PATH_LEN];
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size_t size;
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size_t data_off;
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} __attribute__((packed));
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/* Globals */
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static char *input_path = NULL;
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static void
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help(void)
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{
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printf("usage: ./cumxct [flags]\n");
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printf("[-h] Display this help menu\n");
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printf("[-i] Input CUMHOLE bundle\n");
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}
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static void
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do_parse(struct hole_ref *ref)
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{
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if (ref == NULL) {
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return;
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}
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for (;;) {
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if (memcmp(ref->magic, REF_MAGIC, REF_MAGIC_LEN) != 0) {
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break;
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}
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printf("found '%s' with size %ld\n", ref->path, ref->size);
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++ref;
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}
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}
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static void
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input_parse(void)
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{
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int fd;
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char *data;
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size_t archive_size;
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ssize_t nret;
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fd = open(input_path, O_RDONLY);
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if (fd < 0) {
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printf("fatal: could not open input file\n");
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perror("open");
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return;
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}
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/* Obtain the size of the buffer */
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archive_size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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/* Allocate the actual buffer */
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data = malloc(archive_size);
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if (data == NULL) {
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printf("fatal: could not allocate archive buffer\n");
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close(fd);
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return;
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}
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/* Populate it with bytes */
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nret = read(fd, data, archive_size);
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if (nret <= 0) {
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printf("fatal: could not read archive\n");
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perror("read");
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return;
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}
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do_parse((struct hole_ref *)data);
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close(fd);
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free(data);
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}
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int
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main(int argc, char **argv)
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{
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int opt;
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if (argc < 2) {
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printf("fatal: too few arguments\n");
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help();
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return -1;
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}
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while ((opt = getopt(argc, argv, "hi:")) != -1) {
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switch (opt) {
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case 'h':
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help();
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return -1;
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case 'i':
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input_path = strdup(optarg);
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if (input_path == NULL) {
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printf("fatal: out of memory\n");
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return -1;
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}
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break;
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}
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}
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if (input_path == NULL) {
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printf("fatal: expected input bundle\n");
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help();
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return -1;
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}
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input_parse();
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free(input_path);
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return 0;
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}
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