summaryrefslogtreecommitdiff
path: root/block/vhdx-endian.c
blob: c306b90d5446d83dcc1ecb2eae50825a37cd72cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * Block driver for Hyper-V VHDX Images
 *
 * Copyright (c) 2013 Red Hat, Inc.,
 *
 * Authors:
 *  Jeff Cody <jcody@redhat.com>
 *
 *  This is based on the "VHDX Format Specification v1.00", published 8/25/2012
 *  by Microsoft:
 *      https://www.microsoft.com/en-us/download/details.aspx?id=34750
 *
 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
 * See the COPYING.LIB file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "block/block_int.h"
#include "qemu/bswap.h"
#include "block/vhdx.h"

#include <uuid/uuid.h>


/*
 * All the VHDX formats on disk are little endian - the following
 * are helper import/export functions to correctly convert
 * endianness from disk read to native cpu format, and back again.
 */


/* VHDX File Header */


void vhdx_header_le_import(VHDXHeader *h)
{
    assert(h != NULL);

    le32_to_cpus(&h->signature);
    le32_to_cpus(&h->checksum);
    le64_to_cpus(&h->sequence_number);

    leguid_to_cpus(&h->file_write_guid);
    leguid_to_cpus(&h->data_write_guid);
    leguid_to_cpus(&h->log_guid);

    le16_to_cpus(&h->log_version);
    le16_to_cpus(&h->version);
    le32_to_cpus(&h->log_length);
    le64_to_cpus(&h->log_offset);
}

void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h)
{
    assert(orig_h != NULL);
    assert(new_h != NULL);

    new_h->signature       = cpu_to_le32(orig_h->signature);
    new_h->checksum        = cpu_to_le32(orig_h->checksum);
    new_h->sequence_number = cpu_to_le64(orig_h->sequence_number);

    new_h->file_write_guid = orig_h->file_write_guid;
    new_h->data_write_guid = orig_h->data_write_guid;
    new_h->log_guid        = orig_h->log_guid;

    cpu_to_leguids(&new_h->file_write_guid);
    cpu_to_leguids(&new_h->data_write_guid);
    cpu_to_leguids(&new_h->log_guid);

    new_h->log_version     = cpu_to_le16(orig_h->log_version);
    new_h->version         = cpu_to_le16(orig_h->version);
    new_h->log_length      = cpu_to_le32(orig_h->log_length);
    new_h->log_offset      = cpu_to_le64(orig_h->log_offset);
}


/* VHDX Log Headers */


void vhdx_log_desc_le_import(VHDXLogDescriptor *d)
{
    assert(d != NULL);

    le32_to_cpus(&d->signature);
    le64_to_cpus(&d->file_offset);
    le64_to_cpus(&d->sequence_number);
}

void vhdx_log_desc_le_export(VHDXLogDescriptor *d)
{
    assert(d != NULL);

    cpu_to_le32s(&d->signature);
    cpu_to_le32s(&d->trailing_bytes);
    cpu_to_le64s(&d->leading_bytes);
    cpu_to_le64s(&d->file_offset);
    cpu_to_le64s(&d->sequence_number);
}

void vhdx_log_data_le_import(VHDXLogDataSector *d)
{
    assert(d != NULL);

    le32_to_cpus(&d->data_signature);
    le32_to_cpus(&d->sequence_high);
    le32_to_cpus(&d->sequence_low);
}

void vhdx_log_data_le_export(VHDXLogDataSector *d)
{
    assert(d != NULL);

    cpu_to_le32s(&d->data_signature);
    cpu_to_le32s(&d->sequence_high);
    cpu_to_le32s(&d->sequence_low);
}

void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr)
{
    assert(hdr != NULL);

    le32_to_cpus(&hdr->signature);
    le32_to_cpus(&hdr->checksum);
    le32_to_cpus(&hdr->entry_length);
    le32_to_cpus(&hdr->tail);
    le64_to_cpus(&hdr->sequence_number);
    le32_to_cpus(&hdr->descriptor_count);
    leguid_to_cpus(&hdr->log_guid);
    le64_to_cpus(&hdr->flushed_file_offset);
    le64_to_cpus(&hdr->last_file_offset);
}

void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr)
{
    assert(hdr != NULL);

    cpu_to_le32s(&hdr->signature);
    cpu_to_le32s(&hdr->checksum);
    cpu_to_le32s(&hdr->entry_length);
    cpu_to_le32s(&hdr->tail);
    cpu_to_le64s(&hdr->sequence_number);
    cpu_to_le32s(&hdr->descriptor_count);
    cpu_to_leguids(&hdr->log_guid);
    cpu_to_le64s(&hdr->flushed_file_offset);
    cpu_to_le64s(&hdr->last_file_offset);
}


/* Region table entries */
void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr)
{
    assert(hdr != NULL);

    le32_to_cpus(&hdr->signature);
    le32_to_cpus(&hdr->checksum);
    le32_to_cpus(&hdr->entry_count);
}

void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr)
{
    assert(hdr != NULL);

    cpu_to_le32s(&hdr->signature);
    cpu_to_le32s(&hdr->checksum);
    cpu_to_le32s(&hdr->entry_count);
}

void vhdx_region_entry_le_import(VHDXRegionTableEntry *e)
{
    assert(e != NULL);

    leguid_to_cpus(&e->guid);
    le64_to_cpus(&e->file_offset);
    le32_to_cpus(&e->length);
    le32_to_cpus(&e->data_bits);
}

void vhdx_region_entry_le_export(VHDXRegionTableEntry *e)
{
    assert(e != NULL);

    cpu_to_leguids(&e->guid);
    cpu_to_le64s(&e->file_offset);
    cpu_to_le32s(&e->length);
    cpu_to_le32s(&e->data_bits);
}


/* Metadata headers & table */
void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr)
{
    assert(hdr != NULL);

    le64_to_cpus(&hdr->signature);
    le16_to_cpus(&hdr->entry_count);
}

void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr)
{
    assert(hdr != NULL);

    cpu_to_le64s(&hdr->signature);
    cpu_to_le16s(&hdr->entry_count);
}

void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e)
{
    assert(e != NULL);

    leguid_to_cpus(&e->item_id);
    le32_to_cpus(&e->offset);
    le32_to_cpus(&e->length);
    le32_to_cpus(&e->data_bits);
}
void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e)
{
    assert(e != NULL);

    cpu_to_leguids(&e->item_id);
    cpu_to_le32s(&e->offset);
    cpu_to_le32s(&e->length);
    cpu_to_le32s(&e->data_bits);
}