1  /* Subpart directory entry version 1 support */
 2  /* SPDX-License-Identifier: GPL-2.0-only */
 3  
 4  #include <sys/types.h>
 5  
 6  #include "cse_serger.h"
 7  
 8  #define SUBPART_OFFSET_SHIFT		0
 9  #define SUBPART_OFFSET_MASK		0x1ffffff
10  #define SUBPART_OFFSET(x)		(((x) >> SUBPART_OFFSET_SHIFT) & SUBPART_OFFSET_MASK)
11  #define SUBPART_COMPRESSED_SHIFT	25
12  #define SUBPART_COMPRESSED_MASK	1
13  #define SUBPART_COMPRESSED(x)		\
14  	(((x) >> SUBPART_COMPRESSED_SHIFT) & SUBPART_COMPRESSED_MASK)
15  
16  struct subpart_entry {
17  	uint8_t name[12];
18  	uint32_t offset_bytes;
19  	uint32_t length;
20  	uint32_t rsvd2;
21  } __packed;
22  
23  static void subpart_read_entry(struct buffer *buff, struct subpart_entry *e)
24  {
25  	READ_MEMBER(buff, e->name);
26  	READ_MEMBER(buff, e->offset_bytes);
27  	READ_MEMBER(buff, e->length);
28  	READ_MEMBER(buff, e->rsvd2);
29  }
30  
31  static void subpart_print_entry(const struct subpart_entry *e, size_t index)
32  {
33  	printf("%-25zd%-25.12s0x%-23x%-25c0x%-23x0x%-23x\n", index,
34  		e->name, SUBPART_OFFSET(e->offset_bytes),
35  		SUBPART_COMPRESSED(e->offset_bytes) ? 'Y' : 'N',
36  		e->length, e->rsvd2);
37  }
38  
39  static void subpart_print_entries(struct buffer *buff, size_t count)
40  {
41  	struct subpart_entry *e = malloc(count * sizeof(*e));
42  
43  	if (!e)
44  		return;
45  
46  	for (size_t i = 0; i < count; i++)
47  		subpart_read_entry(buff, &e[i]);
48  
49  	printf("%-25s%-25s%-25s%-25s%-25s%-25s\n", "Entry #", "Name", "Offset",
50  	       "Huffman Compressed?", "Length", "Rsvd");
51  
52  	printf("====================================================================="
53  	       "=====================================================================\n");
54  
55  	for (size_t i = 0; i < count; i++)
56  		subpart_print_entry(&e[i], i + 1);
57  
58  	printf("====================================================================="
59  	       "=====================================================================\n");
60  
61  	free(e);
62  }
63  
64  const struct subpart_entry_ops subpart_entry_1_ops = {
65  	.print = subpart_print_entries,
66  };