[libvirt] [PATCH 2/3] util: use new virendian.h macros
Eric Blake
eblake at redhat.com
Tue Feb 12 00:07:40 UTC 2013
This makes code easier to read, by avoiding lines longer than
80 columns and removing the repetition from the callers.
* src/util/virstoragefile.c (qedGetHeaderUL, qedGetHeaderULL):
Delete in favor of more generic macros.
(qcow2GetBackingStoreFormat, qcowXGetBackingStore)
(qedGetBackingStore, virStorageFileMatchesVersion)
(virStorageFileGetMetadataInternal): Use new macros.
* src/cpu/cpu_x86.c (x86VendorLoad): Likewise.
---
src/cpu/cpu_x86.c | 24 ++++------
src/util/virstoragefile.c | 109 ++++++++++------------------------------------
2 files changed, 30 insertions(+), 103 deletions(-)
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index c9a833a..c750afd 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -1,7 +1,7 @@
/*
* cpu_x86.c: CPU driver for CPUs with x86 compatible CPUID instruction
*
- * Copyright (C) 2009-2011 Red Hat, Inc.
+ * Copyright (C) 2009-2011, 2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -32,6 +32,7 @@
#include "cpu_map.h"
#include "cpu_x86.h"
#include "virbuffer.h"
+#include "virendian.h"
#define VIR_FROM_THIS VIR_FROM_CPU
@@ -548,22 +549,13 @@ x86VendorLoad(xmlXPathContextPtr ctxt,
}
vendor->cpuid.function = 0;
- vendor->cpuid.ebx = (string[0]) |
- (string[1] << 8) |
- (string[2] << 16) |
- (string[3] << 24);
- vendor->cpuid.edx = (string[4]) |
- (string[5] << 8) |
- (string[6] << 16) |
- (string[7] << 24);
- vendor->cpuid.ecx = (string[8]) |
- (string[9] << 8) |
- (string[10] << 16) |
- (string[11] << 24);
-
- if (!map->vendors)
+ vendor->cpuid.ebx = virReadBufInt32LE(string);
+ vendor->cpuid.edx = virReadBufInt32LE(string + 4);
+ vendor->cpuid.ecx = virReadBufInt32LE(string + 8);
+
+ if (!map->vendors) {
map->vendors = vendor;
- else {
+ } else {
vendor->next = map->vendors;
map->vendors = vendor;
}
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 6e2d61e..dc28539 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -42,6 +42,7 @@
#include "c-ctype.h"
#include "vircommand.h"
#include "virhash.h"
+#include "virendian.h"
#define VIR_FROM_THIS VIR_FROM_STORAGE
@@ -255,16 +256,8 @@ qcow2GetBackingStoreFormat(int *format,
*/
while (offset < (buf_size-8) &&
offset < (extension_end-8)) {
- unsigned int magic =
- (buf[offset] << 24) +
- (buf[offset+1] << 16) +
- (buf[offset+2] << 8) +
- (buf[offset+3]);
- unsigned int len =
- (buf[offset+4] << 24) +
- (buf[offset+5] << 16) +
- (buf[offset+6] << 8) +
- (buf[offset+7]);
+ unsigned int magic = virReadBufInt32BE(buf + offset);
+ unsigned int len = virReadBufInt32BE(buf + offset + 4);
offset += 8;
@@ -312,20 +305,10 @@ qcowXGetBackingStore(char **res,
if (buf_size < QCOWX_HDR_BACKING_FILE_OFFSET+8+4)
return BACKING_STORE_INVALID;
- offset = (((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET] << 56)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+1] << 48)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+2] << 40)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+3] << 32)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+4] << 24)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+5] << 16)
- | ((unsigned long long)buf[QCOWX_HDR_BACKING_FILE_OFFSET+6] << 8)
- | buf[QCOWX_HDR_BACKING_FILE_OFFSET+7]); /* QCowHeader.backing_file_offset */
+ offset = virReadBufInt64BE(buf + QCOWX_HDR_BACKING_FILE_OFFSET);
if (offset > buf_size)
return BACKING_STORE_INVALID;
- size = ((buf[QCOWX_HDR_BACKING_FILE_SIZE] << 24)
- | (buf[QCOWX_HDR_BACKING_FILE_SIZE+1] << 16)
- | (buf[QCOWX_HDR_BACKING_FILE_SIZE+2] << 8)
- | buf[QCOWX_HDR_BACKING_FILE_SIZE+3]); /* QCowHeader.backing_file_size */
+ size = virReadBufInt32BE(buf + QCOWX_HDR_BACKING_FILE_SIZE);
if (size == 0) {
if (format)
*format = VIR_STORAGE_FILE_NONE;
@@ -468,28 +451,6 @@ cleanup:
return ret;
}
-static unsigned long
-qedGetHeaderUL(const unsigned char *loc)
-{
- return (((unsigned long)loc[3] << 24) |
- ((unsigned long)loc[2] << 16) |
- ((unsigned long)loc[1] << 8) |
- ((unsigned long)loc[0] << 0));
-}
-
-static unsigned long long
-qedGetHeaderULL(const unsigned char *loc)
-{
- return (((unsigned long long)loc[7] << 56) |
- ((unsigned long long)loc[6] << 48) |
- ((unsigned long long)loc[5] << 40) |
- ((unsigned long long)loc[4] << 32) |
- ((unsigned long long)loc[3] << 24) |
- ((unsigned long long)loc[2] << 16) |
- ((unsigned long long)loc[1] << 8) |
- ((unsigned long long)loc[0] << 0));
-}
-
static int
qedGetBackingStore(char **res,
int *format,
@@ -503,7 +464,7 @@ qedGetBackingStore(char **res,
/* Check if this image has a backing file */
if (buf_size < QED_HDR_FEATURES_OFFSET+8)
return BACKING_STORE_INVALID;
- flags = qedGetHeaderULL(buf + QED_HDR_FEATURES_OFFSET);
+ flags = virReadBufInt64LE(buf + QED_HDR_FEATURES_OFFSET);
if (!(flags & QED_F_BACKING_FILE)) {
*format = VIR_STORAGE_FILE_NONE;
return BACKING_STORE_OK;
@@ -512,10 +473,10 @@ qedGetBackingStore(char **res,
/* Parse the backing file */
if (buf_size < QED_HDR_BACKING_FILE_OFFSET+8)
return BACKING_STORE_INVALID;
- offset = qedGetHeaderUL(buf + QED_HDR_BACKING_FILE_OFFSET);
+ offset = virReadBufInt32LE(buf + QED_HDR_BACKING_FILE_OFFSET);
if (offset > buf_size)
return BACKING_STORE_INVALID;
- size = qedGetHeaderUL(buf + QED_HDR_BACKING_FILE_SIZE);
+ size = virReadBufInt32LE(buf + QED_HDR_BACKING_FILE_SIZE);
if (size == 0)
return BACKING_STORE_OK;
if (offset + size > buf_size || offset + size < offset)
@@ -633,19 +594,10 @@ virStorageFileMatchesVersion(int format,
if ((fileTypeInfo[format].versionOffset + 4) > buflen)
return false;
- if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN) {
- version =
- (buf[fileTypeInfo[format].versionOffset+3] << 24) |
- (buf[fileTypeInfo[format].versionOffset+2] << 16) |
- (buf[fileTypeInfo[format].versionOffset+1] << 8) |
- (buf[fileTypeInfo[format].versionOffset]);
- } else {
- version =
- (buf[fileTypeInfo[format].versionOffset] << 24) |
- (buf[fileTypeInfo[format].versionOffset+1] << 16) |
- (buf[fileTypeInfo[format].versionOffset+2] << 8) |
- (buf[fileTypeInfo[format].versionOffset+3]);
- }
+ if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN)
+ version = virReadBufInt32LE(buf + fileTypeInfo[format].versionOffset);
+ else
+ version = virReadBufInt32BE(buf + fileTypeInfo[format].versionOffset);
VIR_DEBUG("Compare detected version %d vs expected version %d",
version, fileTypeInfo[format].versionNumber);
@@ -687,29 +639,15 @@ virStorageFileGetMetadataFromBuf(int format,
if ((fileTypeInfo[format].sizeOffset + 8) > buflen)
return 1;
- if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN) {
- meta->capacity =
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+7] << 56) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+6] << 48) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+5] << 40) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+4] << 32) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+3] << 24) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+2] << 16) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+1] << 8) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset]);
- } else {
- meta->capacity =
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset] << 56) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+1] << 48) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+2] << 40) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+3] << 32) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+4] << 24) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+5] << 16) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+6] << 8) |
- ((unsigned long long)buf[fileTypeInfo[format].sizeOffset+7]);
- }
+ if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN)
+ meta->capacity = virReadBufInt64LE(buf +
+ fileTypeInfo[format].sizeOffset);
+ else
+ meta->capacity = virReadBufInt64BE(buf +
+ fileTypeInfo[format].sizeOffset);
/* Avoid unlikely, but theoretically possible overflow */
- if (meta->capacity > (ULLONG_MAX / fileTypeInfo[format].sizeMultiplier))
+ if (meta->capacity > (ULLONG_MAX /
+ fileTypeInfo[format].sizeMultiplier))
return 1;
meta->capacity *= fileTypeInfo[format].sizeMultiplier;
}
@@ -717,11 +655,8 @@ virStorageFileGetMetadataFromBuf(int format,
if (fileTypeInfo[format].qcowCryptOffset != -1) {
int crypt_format;
- crypt_format =
- (buf[fileTypeInfo[format].qcowCryptOffset] << 24) |
- (buf[fileTypeInfo[format].qcowCryptOffset+1] << 16) |
- (buf[fileTypeInfo[format].qcowCryptOffset+2] << 8) |
- (buf[fileTypeInfo[format].qcowCryptOffset+3]);
+ crypt_format = virReadBufInt32BE(buf +
+ fileTypeInfo[format].qcowCryptOffset);
meta->encrypted = crypt_format != 0;
}
--
1.8.1.2
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