зеркало из https://github.com/microsoft/lsvmtools.git
123 строки
2.8 KiB
C
123 строки
2.8 KiB
C
/*
|
|
**==============================================================================
|
|
**
|
|
** LSVMTools
|
|
**
|
|
** MIT License
|
|
**
|
|
** Copyright (c) Microsoft Corporation. All rights reserved.
|
|
**
|
|
** Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
** of this software and associated documentation files (the "Software"), to deal
|
|
** in the Software without restriction, including without limitation the rights
|
|
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
** copies of the Software, and to permit persons to whom the Software is
|
|
** furnished to do so, subject to the following conditions:
|
|
**
|
|
** The above copyright notice and this permission notice shall be included in
|
|
** all copies or substantial portions of the Software.
|
|
**
|
|
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
** SOFTWARE
|
|
**
|
|
**==============================================================================
|
|
*/
|
|
#include "gpt.h"
|
|
#include "blkdev.h"
|
|
|
|
int ReadGPT(
|
|
Blkdev* dev,
|
|
GPT* gpt)
|
|
{
|
|
int rc = -1;
|
|
|
|
/* Check parameters */
|
|
if (!dev || !gpt)
|
|
goto done;
|
|
|
|
/* Read the whole GPT into memory */
|
|
if (BlkdevRead(dev, 0, gpt, sizeof(GPT)) != 0)
|
|
goto done;
|
|
|
|
/* Check whether GPT partition */
|
|
if (Memcmp(gpt->header.signature, "EFI PART", 8) != 0)
|
|
goto done;
|
|
|
|
rc = 0;
|
|
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
#if !defined(BUILD_EFI)
|
|
int LoadGPT(
|
|
const char* path,
|
|
GPT* gpt)
|
|
{
|
|
int rc = -1;
|
|
Blkdev* dev = NULL;
|
|
|
|
/* Check parameters */
|
|
if (!path)
|
|
goto done;
|
|
|
|
/* Open the raw root partition */
|
|
if (!(dev = BlkdevOpen(path, BLKDEV_ACCESS_RDONLY, 0)))
|
|
goto done;
|
|
|
|
/* Read the GPT into memory */
|
|
if (ReadGPT(dev, gpt) != 0)
|
|
goto done;
|
|
|
|
rc = 0;
|
|
|
|
done:
|
|
|
|
if (dev)
|
|
dev->Close(dev);
|
|
|
|
return rc;
|
|
}
|
|
#endif /* !defined(BUILD_EFI) */
|
|
|
|
UINTN CountGPTEntries(
|
|
const GPT* gpt)
|
|
{
|
|
UINTN n = 0;
|
|
UINTN i;
|
|
|
|
if (!gpt)
|
|
return 0;
|
|
|
|
for (i = 0; i < GPT_MAX_ENTRIES && gpt->entries[i].typeGUID1; i++)
|
|
n++;
|
|
|
|
return n;
|
|
}
|
|
|
|
UINT32 LBAToParitionNumber(
|
|
const GPT* gpt,
|
|
UINT64 lba)
|
|
{
|
|
UINTN i;
|
|
|
|
for (i = 0; i < GPT_MAX_ENTRIES; i++)
|
|
{
|
|
const GPTEntry* e = &gpt->entries[i];
|
|
|
|
if (e->typeGUID1 == 0)
|
|
break;
|
|
|
|
if (lba >= e->startingLBA && lba <= e->endingLBA)
|
|
return i + 1;
|
|
}
|
|
|
|
/* Not found */
|
|
return 0;
|
|
}
|