1  /* Subpart directory header version 2 support */
 2  /* SPDX-License-Identifier: GPL-2.0-only */
 3  
 4  #include <sys/types.h>
 5  
 6  #include "cse_serger.h"
 7  
 8  struct subpart_hdr {
 9  	uint32_t signature;		/* SUBPART_SIGNATURE */
10  	uint32_t count;
11  	uint8_t hdr_version;		/* Header version = 2 */
12  	uint8_t entry_version;		/* Entry version = 1 */
13  	uint8_t length;
14  	uint8_t reserved;
15  	uint8_t name[4];
16  	uint32_t checksum;
17  } __packed;
18  
19  static subpart_hdr_ptr subpart_hdr_read(struct buffer *buff)
20  {
21  	struct subpart_hdr *hdr = malloc(sizeof(*hdr));
22  
23  	if (!hdr)
24  		return NULL;
25  
26  	READ_MEMBER(buff, hdr->signature);
27  	READ_MEMBER(buff, hdr->count);
28  	READ_MEMBER(buff, hdr->hdr_version);
29  	READ_MEMBER(buff, hdr->entry_version);
30  	READ_MEMBER(buff, hdr->length);
31  	READ_MEMBER(buff, hdr->reserved);
32  	READ_MEMBER(buff, hdr->name);
33  	READ_MEMBER(buff, hdr->checksum);
34  
35  	return hdr;
36  }
37  
38  static void subpart_hdr_print(const subpart_hdr_ptr ptr)
39  {
40  	const struct subpart_hdr *hdr = ptr;
41  
42  	printf("%-25s %.4s\n", "Signature", (const char *)&hdr->signature);
43  	printf("%-25s %-25d\n", "Count", hdr->count);
44  	printf("%-25s %-25d\n", "Header Version", hdr->hdr_version);
45  	printf("%-25s %-25d\n", "Entry Version", hdr->entry_version);
46  	printf("%-25s 0x%-23x\n", "Header Length", hdr->length);
47  	printf("%-25s 0x%-23x\n", "Reserved", hdr->reserved);
48  	printf("%-25s ", "Name");
49  	for (size_t i = 0; i < sizeof(hdr->name); i++)
50  		printf("%c", hdr->name[i]);
51  	printf("\n");
52  	printf("%-25s 0x%-23x\n", "Checksum", hdr->checksum);
53  }
54  
55  static size_t subpart_get_count(const subpart_hdr_ptr ptr)
56  {
57  	const struct subpart_hdr *hdr = ptr;
58  
59  	return hdr->count;
60  }
61  
62  static void subpart_hdr_free(subpart_hdr_ptr ptr)
63  {
64  	free(ptr);
65  }
66  
67  const struct subpart_hdr_ops subpart_hdr_2_ops = {
68  	.read = subpart_hdr_read,
69  	.print = subpart_hdr_print,
70  	.get_entry_count = subpart_get_count,
71  	.free = subpart_hdr_free,
72  };