[libvirt] [PATCH v2 06/15] util: Modify the FileTypeInfo to add a version size
John Ferlan
jferlan at redhat.com
Thu Jun 23 17:29:02 UTC 2016
The version field historically has been a 4 byte data; however, an upcoming
new type will use a 2 byte version. So let's adjust for that now.
Signed-off-by: John Ferlan <jferlan at redhat.com>
---
src/util/virstoragefile.c | 60 +++++++++++++++++++++++++++++------------------
1 file changed, 37 insertions(+), 23 deletions(-)
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index de4955b..37e9798 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1,7 +1,7 @@
/*
* virstoragefile.c: file utility functions for FS storage backend
*
- * Copyright (C) 2007-2014 Red Hat, Inc.
+ * Copyright (C) 2007-2014, 2016 Red Hat, Inc.
* Copyright (C) 2007-2008 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
@@ -120,10 +120,12 @@ struct FileTypeInfo {
* to check at head of file */
const char *extension; /* Optional file extension to check */
enum lv_endian endian; /* Endianness of file format */
+
int versionOffset; /* Byte offset from start of file
* where we find version number,
* -1 to always fail the version test,
* -2 to always pass the version test */
+ int versionSize; /* Size in bytes of version data (0, 2, or 4) */
int versionNumbers[FILE_TYPE_VERSIONS_LAST];
/* Version numbers to validate. Zeroes are ignored. */
int sizeOffset; /* Byte offset from start of file
@@ -189,15 +191,15 @@ qedGetBackingStore(char **, int *, const char *, size_t);
static struct FileTypeInfo const fileTypeInfo[] = {
[VIR_STORAGE_FILE_NONE] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
- -1, {0}, 0, 0, 0, 0, NULL, NULL },
+ -1, 0, {0}, 0, 0, 0, 0, NULL, NULL },
[VIR_STORAGE_FILE_RAW] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
- -1, {0}, 0, 0, 0, 0, NULL, NULL },
+ -1, 0, {0}, 0, 0, 0, 0, NULL, NULL },
[VIR_STORAGE_FILE_DIR] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
- -1, {0}, 0, 0, 0, 0, NULL, NULL },
+ -1, 0, {0}, 0, 0, 0, 0, NULL, NULL },
[VIR_STORAGE_FILE_BOCHS] = {
/*"Bochs Virtual HD Image", */ /* Untested */
0, NULL, NULL,
- LV_LITTLE_ENDIAN, 64, {0x20000},
+ LV_LITTLE_ENDIAN, 64, 4, {0x20000},
32+16+16+4+4+4+4+4, 8, 1, -1, NULL, NULL
},
[VIR_STORAGE_FILE_CLOOP] = {
@@ -206,7 +208,7 @@ static struct FileTypeInfo const fileTypeInfo[] = {
modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1
*/ /* Untested */
0, NULL, NULL,
- LV_LITTLE_ENDIAN, -1, {0},
+ LV_LITTLE_ENDIAN, -1, 0, {0},
-1, 0, 0, -1, NULL, NULL
},
[VIR_STORAGE_FILE_DMG] = {
@@ -214,60 +216,60 @@ static struct FileTypeInfo const fileTypeInfo[] = {
* /usr/share/misc/magic lists double magic (both offsets
* would have to match) but then disables that check. */
0, NULL, ".dmg",
- 0, -1, {0},
+ 0, -1, 0, {0},
-1, 0, 0, -1, NULL, NULL
},
[VIR_STORAGE_FILE_ISO] = {
32769, "CD001", ".iso",
- LV_LITTLE_ENDIAN, -2, {0},
+ LV_LITTLE_ENDIAN, -2, 0, {0},
-1, 0, 0, -1, NULL, NULL
},
[VIR_STORAGE_FILE_VPC] = {
0, "conectix", NULL,
- LV_BIG_ENDIAN, 12, {0x10000},
+ LV_BIG_ENDIAN, 12, 4, {0x10000},
8 + 4 + 4 + 8 + 4 + 4 + 2 + 2 + 4, 8, 1, -1, NULL, NULL
},
/* TODO: add getBackingStore function */
[VIR_STORAGE_FILE_VDI] = {
64, "\x7f\x10\xda\xbe", ".vdi",
- LV_LITTLE_ENDIAN, 68, {0x00010001},
+ LV_LITTLE_ENDIAN, 68, 4, {0x00010001},
64 + 5 * 4 + 256 + 7 * 4, 8, 1, -1, NULL, NULL},
/* Not direct file formats, but used for various drivers */
[VIR_STORAGE_FILE_FAT] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
- -1, {0}, 0, 0, 0, 0, NULL, NULL },
+ -1, 0, {0}, 0, 0, 0, 0, NULL, NULL },
[VIR_STORAGE_FILE_VHD] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
- -1, {0}, 0, 0, 0, 0, NULL, NULL },
+ -1, 0, {0}, 0, 0, 0, 0, NULL, NULL },
[VIR_STORAGE_FILE_PLOOP] = { 0, "WithouFreSpacExt", NULL, LV_LITTLE_ENDIAN,
- -2, {0}, PLOOP_IMAGE_SIZE_OFFSET, 0,
+ -2, 0, {0}, PLOOP_IMAGE_SIZE_OFFSET, 0,
PLOOP_SIZE_MULTIPLIER, -1, NULL, NULL },
/* All formats with a backing store probe below here */
[VIR_STORAGE_FILE_COW] = {
0, "OOOM", NULL,
- LV_BIG_ENDIAN, 4, {2},
+ LV_BIG_ENDIAN, 4, 4, {2},
4+4+1024+4, 8, 1, -1, cowGetBackingStore, NULL
},
[VIR_STORAGE_FILE_QCOW] = {
0, "QFI", NULL,
- LV_BIG_ENDIAN, 4, {1},
+ LV_BIG_ENDIAN, 4, 4, {1},
QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW1_HDR_CRYPT, qcow1GetBackingStore, NULL
},
[VIR_STORAGE_FILE_QCOW2] = {
0, "QFI", NULL,
- LV_BIG_ENDIAN, 4, {2, 3},
+ LV_BIG_ENDIAN, 4, 4, {2, 3},
QCOWX_HDR_IMAGE_SIZE, 8, 1, QCOW2_HDR_CRYPT, qcow2GetBackingStore,
qcow2GetFeatures
},
[VIR_STORAGE_FILE_QED] = {
/* http://wiki.qemu.org/Features/QED */
0, "QED", NULL,
- LV_LITTLE_ENDIAN, -2, {0},
+ LV_LITTLE_ENDIAN, -2, 0, {0},
QED_HDR_IMAGE_SIZE, 8, 1, -1, qedGetBackingStore, NULL
},
[VIR_STORAGE_FILE_VMDK] = {
0, "KDMV", NULL,
- LV_LITTLE_ENDIAN, 4, {1, 2},
+ LV_LITTLE_ENDIAN, 4, 4, {1, 2},
4+4+4, 8, 512, -1, vmdk4GetBackingStore, NULL
},
};
@@ -635,13 +637,25 @@ virStorageFileMatchesVersion(int format,
if (fileTypeInfo[format].versionOffset == -2)
return true;
- if ((fileTypeInfo[format].versionOffset + 4) > buflen)
+ if ((fileTypeInfo[format].versionOffset +
+ fileTypeInfo[format].versionSize) > buflen)
return false;
- if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN)
- version = virReadBufInt32LE(buf + fileTypeInfo[format].versionOffset);
- else
- version = virReadBufInt32BE(buf + fileTypeInfo[format].versionOffset);
+ if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN) {
+ if (fileTypeInfo[format].versionSize == 4)
+ version = virReadBufInt32LE(buf +
+ fileTypeInfo[format].versionOffset);
+ else
+ version = virReadBufInt16LE(buf +
+ fileTypeInfo[format].versionOffset);
+ } else {
+ if (fileTypeInfo[format].versionSize == 4)
+ version = virReadBufInt32BE(buf +
+ fileTypeInfo[format].versionOffset);
+ else
+ version = virReadBufInt16BE(buf +
+ fileTypeInfo[format].versionOffset);
+ }
for (i = 0;
i < FILE_TYPE_VERSIONS_LAST && fileTypeInfo[format].versionNumbers[i];
--
2.5.5
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