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longpanda 2020-04-05 00:07:50 +08:00
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VtoyTool/BabyISO/biso_eltorito.c Normal file
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/******************************************************************************
* bios_eltorito.c
*
* Copyright (c) 2020, longpanda <admin@ventoy.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "biso.h"
#include "biso_list.h"
#include "biso_util.h"
#include "biso_9660.h"
#include "biso_eltorito.h"
ULONG BISO_ELTORITO_ReadBootInfo
(
IN BISO_FILE_S *pstFile,
OUT BISO_PARSER_S *pstParser
)
{
USHORT i;
UINT uiReadLen = 0;
UINT64 ui64Seek = 0;
UCHAR aucBuf[BISO_SECTOR_SIZE];
BISO_MBUF_S stMBuf;
BISO_TORITO_SECHDR_ENTRY_S *pstSecHdr = NULL;
BISO_TORITO_SECTION_ENTRY_S *pstSection = NULL;
DBGASSERT(NULL != pstFile);
DBGASSERT(NULL != pstParser);
if (NULL == pstParser->pstBVD)
{
return BISO_SUCCESS;
}
memset(&stMBuf, 0, sizeof(stMBuf));
ui64Seek = (UINT64)pstParser->pstBVD->uiBootCatlogStart * BISO_SECTOR_SIZE;
BISO_PLAT_SeekFile(pstFile, ui64Seek, SEEK_SET);
/* 先读取1个逻辑扇区的内容 */
uiReadLen = (UINT)BISO_PLAT_ReadFile(pstFile, 1, BISO_SECTOR_SIZE, aucBuf);
if (uiReadLen != BISO_SECTOR_SIZE)
{
BISO_DIAG("Read len %u buf len %u.", uiReadLen, BISO_SECTOR_SIZE);
return BISO_ERR_READ_FILE;
}
/* 前两条Entry固定是Validation和Initial */
pstSecHdr = (BISO_TORITO_SECHDR_ENTRY_S *)(aucBuf + 2 * BISO_ELTORITO_ENTRY_LEN);
pstSection = (BISO_TORITO_SECTION_ENTRY_S *)pstSecHdr;
while ((0x90 == pstSecHdr->ucFlag) || (0x91 == pstSecHdr->ucFlag))
{
pstSecHdr = (BISO_TORITO_SECHDR_ENTRY_S *)pstSection;
BISO_ELTORITO_ENTRY_STEP(pstSection, pstFile, aucBuf, stMBuf);
for (i = 0; i < pstSecHdr->usSecEntryNum; )
{
/*
* Section Entry和Extension Entry都是由ucFlag的Bit5决定是否结束
* 因此这里全部都用Section Entry的结构做判断
*/
if (0 == (pstSection->ucFlag & 0x10))
{
i++;
}
BISO_ELTORITO_ENTRY_STEP(pstSection, pstFile, aucBuf, stMBuf);
}
if (0x91 == pstSecHdr->ucFlag) /* 91代表最后一个 */
{
break;
}
}
if ((UCHAR *)pstSection > aucBuf)
{
(VOID)BISO_MBUF_Append(&stMBuf, (UCHAR *)pstSection - aucBuf, aucBuf);
}
/* 保存到全局结构中 */
pstParser->uiElToritoLen = stMBuf.uiTotDataSize;
pstParser->pucElToritoEntry = (UCHAR *)BISO_MALLOC(pstParser->uiElToritoLen);
if (NULL == pstParser->pucElToritoEntry)
{
BISO_MBUF_Free(&stMBuf);
return BISO_ERR_ALLOC_MEM;
}
BISO_MBUF_CopyToBuf(&stMBuf, pstParser->pucElToritoEntry);
BISO_MBUF_Free(&stMBuf);
return BISO_SUCCESS;
}
VOID BISO_ELTORITO_Dump(IN CONST BISO_PARSER_S *pstParser)
{
BISO_DUMP("uiElToritoLen=%u\n", pstParser->uiElToritoLen);
}
UINT BISO_ELTORITO_GetBootEntryNum(IN CONST BISO_PARSER_S *pstParser)
{
UINT uiRet = 0;
UINT uiEntryNum = 0;
UCHAR *pucData = NULL;
BISO_TORITO_VALIDATION_ENTRY_S *pstValidation = NULL;
BISO_TORITO_INITIAL_ENTRY_S *pstInitial = NULL;
if (NULL == pstParser->pucElToritoEntry)
{
return 0;
}
uiEntryNum = pstParser->uiElToritoLen / BISO_ELTORITO_ENTRY_LEN;
pstValidation = (BISO_TORITO_VALIDATION_ENTRY_S *)pstParser->pucElToritoEntry;
pstInitial = (BISO_TORITO_INITIAL_ENTRY_S *)(pstValidation + 1);
if (pstInitial->ucBootId == 0x88)
{
uiRet++;
}
pucData = pstParser->pucElToritoEntry + 2 * BISO_ELTORITO_ENTRY_LEN;
uiEntryNum-= 2;
while (uiEntryNum > 0)
{
if ((0x90 == pucData[0]) || (0x91 == pucData[0]))
{
}
else if (0x44 == pucData[0])
{
}
else
{
if (((BISO_TORITO_SECTION_ENTRY_S *)pucData)->ucBootId == 0x88)
{
uiRet++;
}
}
pucData += BISO_ELTORITO_ENTRY_LEN;
uiEntryNum--;
}
return uiRet;
}