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568 lines
18 KiB
C
568 lines
18 KiB
C
/******************************************************************************
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* biso_rockridge.c
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*
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* Copyright (c) 2020, longpanda <admin@ventoy.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "biso.h"
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#include "biso_list.h"
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#include "biso_util.h"
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#include "biso_9660.h"
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#include "biso_dump.h"
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#include "biso_rockridge.h"
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/* Rock Ridge扩展处理函数数组, NULL表示暂时不处理这类表项 */
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STATIC BISO_RRIP_PARSE_ENTRY_CB_S g_astBISO_RRIP_ParseFunc[] =
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{
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{ "CE", NULL },
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{ "PD", NULL },
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{ "SP", NULL },
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{ "ST", NULL },
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{ "ER", NULL },
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{ "ES", NULL },
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{ "RR", NULL },
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{ "PX", BISO_RRIP_GetPXInfo },
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{ "PN", BISO_RRIP_GetPNInfo },
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{ "SL", BISO_RRIP_GetSLInfo },
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{ "NM", BISO_RRIP_GetNMInfo },
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{ "CL", NULL },
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{ "PL", NULL },
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{ "RE", NULL },
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{ "TF", BISO_RRIP_GetTFInfo },
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{ "SF", NULL },
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};
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STATIC VOID BISO_RRIP_AddLinkBuf
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(
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IN CHAR *pcBuf,
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IN UINT uiBufLen,
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INOUT BISO_POSIX_INFO_S *pstPosixInfo
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)
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{
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CHAR *pcNewBuf = NULL;
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DBGASSERT(NULL != pstPosixInfo);
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DBGASSERT(NULL != pcBuf);
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/*
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* 这里采用的是最简单的每次重新申请大内存保存老数据和新数据的方式
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* 实际上效率是比较低的，但是由于普通ISO文件中link类型本身就不多
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* 而有连续多条SL表项的就更少了，所以这里只是简单实现功能，没有特别考虑效率
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*/
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/* 申请一个新Buf用于保存原有的数据和这次的新数据 */
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pcNewBuf = (CHAR *)BISO_ZALLOC(uiBufLen + pstPosixInfo->uiLinkLen);
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if (NULL == pcNewBuf)
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{
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return;
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}
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if (NULL == pstPosixInfo->pcLinkSrc)
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{
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memcpy(pcNewBuf, pcBuf, uiBufLen);
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}
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else
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{
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/* 分别保存新老数据，同时把老的Buf释放掉 */
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memcpy(pcNewBuf, pstPosixInfo->pcLinkSrc, pstPosixInfo->uiLinkLen);
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memcpy(pcNewBuf + pstPosixInfo->uiLinkLen, pcBuf, uiBufLen);
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BISO_FREE(pstPosixInfo->pcLinkSrc);
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}
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/* 更新数据Buf */
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pstPosixInfo->pcLinkSrc = pcNewBuf;
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pstPosixInfo->uiLinkLen += uiBufLen;
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}
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STATIC UINT BISO_RRIP_CalcLinkLen
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(
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IN CONST CHAR *pcComponet,
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IN UINT uiComponetLen
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)
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{
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UINT uiBufLen = 0;
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UINT uiOffset = 0;
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UINT uiTotLen = 0;
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BISO_RRIP_SL_COMPONENT_S *pstComp = NULL;
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DBGASSERT(NULL != pcComponet);
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DBGASSERT(uiComponetLen > 0);
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/* 拼接出链接的源路径 */
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while (uiOffset < uiComponetLen)
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{
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uiBufLen = 0;
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pstComp = (BISO_RRIP_SL_COMPONENT_S *)(pcComponet + uiOffset);
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if (BOOL_TRUE == BISO_SLCOMP_IS_ROOT(pstComp->ucFlags))
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{
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/* ROOT不需处理，后面会添加/ */
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}
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else if (BOOL_TRUE == BISO_SLCOMP_IS_CURRENT(pstComp->ucFlags))
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{
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uiBufLen = 1; /* . */
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}
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else if (BOOL_TRUE == BISO_SLCOMP_IS_PARENT(pstComp->ucFlags))
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{
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uiBufLen = 2; /* .. */
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}
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else
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{
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uiBufLen = pstComp->ucLength;
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}
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/* ucLength不包括头两个字节 */
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uiOffset += pstComp->ucLength + 2;
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/*
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* 如果是link路径的一部分完结,则需要在后面加上'/',否则不加.
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* 不加的情况有两种: 1是整体已经完了 2是路径的一部分还没有完整
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* 比如说链接的位置是 /root/xxxx/a.txt 而xxxx可能非常长(200+个字符)
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* 那么此时光xxxx的部分可能就需要两个Componet部分才能表达完,而这两个
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* 之间是不能加反斜杠的.
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*/
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if ((uiOffset < uiComponetLen) && (BOOL_TRUE != BISO_SLCOMP_IS_CONTINUE(pstComp->ucFlags)))
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{
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uiBufLen++;
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}
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uiTotLen += uiBufLen;
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}
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return uiTotLen;
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}
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STATIC UINT BISO_RRIP_GetPartLink
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(
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IN CONST BISO_RRIP_SL_COMPONENT_S *pstComponent,
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IN UINT uiBufSize,
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OUT CHAR *pcBuf
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)
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{
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UINT uiBufLen = 0;
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DBGASSERT(NULL != pstComponent);
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DBGASSERT(NULL != pcBuf);
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if (BOOL_TRUE == BISO_SLCOMP_IS_ROOT(pstComponent->ucFlags))
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{
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/* ROOT不需处理，后面会添加/ */
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}
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else if (BOOL_TRUE == BISO_SLCOMP_IS_CURRENT(pstComponent->ucFlags))
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{
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scnprintf(pcBuf, uiBufSize, ".");
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uiBufLen = 1;
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}
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else if (BOOL_TRUE == BISO_SLCOMP_IS_PARENT(pstComponent->ucFlags))
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{
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scnprintf(pcBuf, uiBufSize, "..");
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uiBufLen = 2;
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}
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else
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{
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memcpy(pcBuf, pstComponent->aucData, pstComponent->ucLength);
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uiBufLen = pstComponent->ucLength;
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}
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return uiBufLen;
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}
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STATIC BOOL_T BISO_RRIP_IsThisType(IN BISO_SUSP_ENTRY_S *pstEntry, IN CONST CHAR *pcType)
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{
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if (NULL == pstEntry || NULL == pcType)
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{
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return BOOL_FALSE;
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}
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if ((pstEntry->cSignature1 == pcType[0]) && (pstEntry->cSignature2 == pcType[1]))
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{
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return BOOL_TRUE;
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}
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return BOOL_FALSE;
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}
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STATIC UCHAR * BISO_RRIP_GetSysUseArea
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(
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IN BISO_FILE_S *pstFile,
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IN UCHAR *pucSysUseField,
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IN UINT uiSysUseFieldLen,
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OUT UINT *puiAreaSize
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)
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{
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UINT uiCELen = 0;
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UINT uiCurPos = 0;
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UINT uiReadLen = 0;
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UINT64 ui64Seek = 0;
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UCHAR *pucSysUseArea = NULL;
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BISO_SUSP_ENTRY_S *pstEntry = NULL;
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BISO_SUSP_ENTRY_CE_S *pstCEEntry = NULL;
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DBGASSERT(NULL != pstFile);
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DBGASSERT(NULL != pucSysUseField);
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DBGASSERT(NULL != puiAreaSize);
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/*
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* 虽然Rock Ridge扩展标准中允许整个System Use Area中有多个CE表项来扩展，
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* 但是由于一条CE表项可以扩展的长度就足够了(32bit) 所以这里我感觉正常情况下
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* 没有必要使用多个CE表项扩展空间。因此这里只支持1条CE表项的情况。
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*/
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/* 遍历当前System Use Field, 标准规定剩余空间小于4字节,则后面的忽略 */
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for (uiCurPos = 0; uiCurPos + 4 < uiSysUseFieldLen; uiCurPos += pstEntry->ucEntryLen)
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{
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pstEntry = (BISO_SUSP_ENTRY_S *)(pucSysUseField + uiCurPos);
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/* 找到1个CE表项就停止，这里默认CE表项是最后一条表项 */
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if (BOOL_TRUE == BISO_RRIP_IsThisType(pstEntry, "CE"))
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{
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pstCEEntry = (BISO_SUSP_ENTRY_CE_S *)pstEntry;
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uiCELen = pstCEEntry->uiContinuationLen;
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/* BISO_DUMP_ShowSUSPEntry(pstCEEntry); */
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break;
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}
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}
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/* 申请一块内存把这两部分合并起来 */
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pucSysUseArea = (UCHAR *)BISO_MALLOC(uiCurPos + uiCELen);
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if (NULL == pucSysUseArea)
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{
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return NULL;
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}
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/* 先拷贝System Use Field字段 */
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memcpy(pucSysUseArea, pucSysUseField, uiCurPos);
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/* 如果有CE表项则再同文件中读出CE部分的数据 */
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if (NULL != pstCEEntry)
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{
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ui64Seek = (UINT64)pstCEEntry->uiBlockLoc * BISO_BLOCK_SIZE + pstCEEntry->uiByteOffset;
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BISO_PLAT_SeekFile(pstFile, ui64Seek, SEEK_SET);
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uiReadLen = (UINT)BISO_PLAT_ReadFile(pstFile, 1, uiCELen, pucSysUseArea + uiCurPos);
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if (uiReadLen != uiCELen)
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{
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BISO_DIAG("Read len %u buf len %u.", uiReadLen, uiCELen);
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BISO_FREE(pucSysUseArea);
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return NULL;
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}
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}
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*puiAreaSize = uiCurPos + uiCELen;
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return pucSysUseArea;
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}
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VOID BISO_RRIP_GetPXInfo(IN VOID *pEntry, OUT BISO_DIR_TREE_S *pstDirTree)
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{
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BISO_POSIX_INFO_S *pstPosixInfo = NULL;
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BISO_ROCK_RIDGE_ENTRY_PX_S *pstPXEntry = NULL;
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DBGASSERT(NULL != pEntry);
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DBGASSERT(NULL != pstDirTree);
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DBGASSERT(NULL != pstDirTree->pstPosixInfo);
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pstPXEntry = (BISO_ROCK_RIDGE_ENTRY_PX_S *)pEntry;
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pstPosixInfo = pstDirTree->pstPosixInfo;
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pstPosixInfo->uiPosixFileMode = pstPXEntry->uiPosixFileMode;
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pstPosixInfo->uiPosixFileLink = pstPXEntry->uiPosixFileLink;
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pstPosixInfo->uiPosixFileUserId = pstPXEntry->uiPosixFileUserId;
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pstPosixInfo->uiPosixFileGroupId = pstPXEntry->uiPosixFileGroupId;
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pstPosixInfo->uiPosixFileSNO = pstPXEntry->uiPosixFileSNO;
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}
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VOID BISO_RRIP_GetNMInfo(IN VOID *pEntry, OUT BISO_DIR_TREE_S *pstDirTree)
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{
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BISO_ROCK_RIDGE_ENTRY_NM_S *pstNMEntry = NULL;
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DBGASSERT(NULL != pEntry);
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DBGASSERT(NULL != pstDirTree);
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DBGASSERT(NULL != pstDirTree->pstPosixInfo);
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pstNMEntry = (BISO_ROCK_RIDGE_ENTRY_NM_S *)pEntry;
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/* 如有NM表项就替换ISO9660文件名 */
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if (BOOL_TRUE != pstDirTree->pstPosixInfo->bHasNMEntry)
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{
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pstDirTree->pstPosixInfo->bHasNMEntry = BOOL_TRUE;
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memset(pstDirTree->szName, 0, sizeof(pstDirTree->szName));
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pstDirTree->usNameLen = 0;
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}
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/*
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* 拼接文件名, 有可能本函数会多次调用,多次拼接(文件名超长的情况)
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* TODO: 是否需要关注字符编码???
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*/
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strncat(pstDirTree->szName, pstNMEntry->szFileName, pstNMEntry->ucEntryLen - 5);
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pstDirTree->usNameLen += pstNMEntry->ucEntryLen - 5;
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}
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VOID BISO_RRIP_GetTFInfo(IN VOID *pEntry, OUT BISO_DIR_TREE_S *pstDirTree)
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{
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UINT i;
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UCHAR *pucCur = NULL;
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BISO_DATE_915_S *pst915Date = NULL;
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BISO_ROCK_RIDGE_ENTRY_TF_S *pstTFEntry = NULL;
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BISO_DATE_S *apstDate[] =
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{
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&(pstDirTree->pstPosixInfo->stCreateTime),
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&(pstDirTree->pstPosixInfo->stModifyTime),
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&(pstDirTree->pstPosixInfo->stLastAccessTime),
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&(pstDirTree->pstPosixInfo->stLastAttrChangeTime),
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&(pstDirTree->pstPosixInfo->stLastBackupTime),
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&(pstDirTree->pstPosixInfo->stExpirationTime),
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&(pstDirTree->pstPosixInfo->stEffectiveTime)
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};
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DBGASSERT(NULL != pEntry);
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DBGASSERT(NULL != pstDirTree);
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DBGASSERT(NULL != pstDirTree->pstPosixInfo);
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pstTFEntry = (BISO_ROCK_RIDGE_ENTRY_TF_S *)pEntry;
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pucCur = pstTFEntry->aucTimeStamp;
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for (i = 0; i < ARRAY_SIZE(apstDate); i++)
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{
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/* 比特位0说明该时间戳没有记录 */
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if (0 == ((pstTFEntry->ucFlags >> i) & 0x1))
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{
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continue;
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}
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/* Bit7决定是按照哪种格式记录的 */
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if ((pstTFEntry->ucFlags >> 7) & 0x1)
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{
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(VOID)BISO_9660_ParseDate84261((CHAR *)pucCur, apstDate[i]);
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pucCur += 17;
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}
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else
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{
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pst915Date = (BISO_DATE_915_S *)pucCur;
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pucCur += 7;
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apstDate[i]->usYear = pst915Date->ucYear + 1900;
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apstDate[i]->ucMonth = pst915Date->ucMonth;
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apstDate[i]->ucDay = pst915Date->ucDay;
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apstDate[i]->ucHour = pst915Date->ucHour;
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apstDate[i]->ucMin = pst915Date->ucMin;
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apstDate[i]->ucSecond = pst915Date->ucSec;
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apstDate[i]->usMillSec = 0;
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apstDate[i]->cZone = pst915Date->cTimeZone / 4;
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}
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}
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}
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VOID BISO_RRIP_GetPNInfo(IN VOID *pEntry, OUT BISO_DIR_TREE_S *pstDirTree)
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{
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BISO_ROCK_RIDGE_ENTRY_PN_S *pstPNEntry = NULL;
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DBGASSERT(NULL != pEntry);
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DBGASSERT(NULL != pstDirTree);
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DBGASSERT(NULL != pstDirTree->pstPosixInfo);
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pstPNEntry = (BISO_ROCK_RIDGE_ENTRY_PN_S *)pEntry;
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pstDirTree->pstPosixInfo->ui64DevNum = ((UINT64)(pstPNEntry->uiDevNumHigh) << 32) | pstPNEntry->uiDevNumLow;
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}
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VOID BISO_RRIP_GetSLInfo(IN VOID *pEntry, OUT BISO_DIR_TREE_S *pstDirTree)
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{
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UINT uiBufLen = 0;
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UINT uiOffset = 0;
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UINT uiCurPos = 0;
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UCHAR ucCompentLen = 0;
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CHAR *pcFullLinkPath = NULL;
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BISO_POSIX_INFO_S *pstPosixInfo = NULL;
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BISO_ROCK_RIDGE_ENTRY_SL_S *pstSLEntry = NULL;
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BISO_RRIP_SL_COMPONENT_S *pstComp = NULL;
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CHAR szBuf[300]; /* 当前Length是用UCHAR存储的，一定不会超过300 */
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DBGASSERT(NULL != pEntry);
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DBGASSERT(NULL != pstDirTree);
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DBGASSERT(NULL != pstDirTree->pstPosixInfo);
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pstSLEntry = (BISO_ROCK_RIDGE_ENTRY_SL_S *)pEntry;
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pstPosixInfo = pstDirTree->pstPosixInfo;
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ucCompentLen = pstSLEntry->ucEntryLen - 5;
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/*
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* 把所有SL表项的Componet部分拼接起来，如果有连续几条SL表项
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* 那么当前函数会依次被调用，每次都拼接一部分,直到整个Componet整合完成.
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*/
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BISO_RRIP_AddLinkBuf((CHAR *)(pstSLEntry->aucComponet), ucCompentLen, pstPosixInfo);
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/* FLAG的Bit0为0表示是最后1个SL表项,此时Componet已经整合在一起了,这里直接处理 */
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if (0 == (pstSLEntry->ucFlags & 0x1))
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{
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/* 申请一段内存用来保存符号链接的源路径 */
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uiBufLen = BISO_RRIP_CalcLinkLen(pstPosixInfo->pcLinkSrc, pstPosixInfo->uiLinkLen);
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pcFullLinkPath = (CHAR *)BISO_MALLOC(uiBufLen + 10);
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if (NULL == pcFullLinkPath)
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{
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BISO_FREE(pstPosixInfo->pcLinkSrc);
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pstPosixInfo->uiLinkLen = 0;
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return;
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}
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/* 拼接出链接的源路径 */
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while (uiOffset < pstPosixInfo->uiLinkLen)
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{
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pstComp = (BISO_RRIP_SL_COMPONENT_S *)(pstPosixInfo->pcLinkSrc + uiOffset);
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uiBufLen = BISO_RRIP_GetPartLink(pstComp, sizeof(szBuf), szBuf);
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/* ucLength不包括头两个字节 */
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uiOffset += pstComp->ucLength + 2;
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/*
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* 如果是link路径的一部分完结,则需要在后面加上'/',否则不加.
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* 不加的情况有两种: 1是整体已经完了 2是路径的一部分还没有完整
|
||
* 比如说链接的位置是 /root/xxxx/a.txt 而xxxx可能非常长(200+个字符)
|
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* 那么此时光xxxx的部分可能就需要两个Componet部分才能表达完,而这两个
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* 之间是不能加反斜杠的.
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*/
|
||
if ((uiOffset < pstPosixInfo->uiLinkLen) && (BOOL_TRUE != BISO_SLCOMP_IS_CONTINUE(pstComp->ucFlags)))
|
||
{
|
||
szBuf[uiBufLen++] = '/';
|
||
}
|
||
|
||
memcpy(pcFullLinkPath + uiCurPos, szBuf, uiBufLen);
|
||
uiCurPos += uiBufLen;
|
||
}
|
||
|
||
pcFullLinkPath[uiCurPos++] = 0;
|
||
|
||
/* 原来的内存释放掉 */
|
||
BISO_FREE(pstPosixInfo->pcLinkSrc);
|
||
pstPosixInfo->pcLinkSrc = pcFullLinkPath;
|
||
pstPosixInfo->uiLinkLen = uiCurPos;
|
||
}
|
||
}
|
||
|
||
ULONG BISO_RRIP_ReadExtInfo
|
||
(
|
||
IN BISO_FILE_S *pstFile,
|
||
IN BISO_PARSER_S *pstParser,
|
||
IN BISO_DIR_RECORD_S *pstRecord,
|
||
OUT BISO_DIR_TREE_S *pstDirTree
|
||
)
|
||
{
|
||
UINT i = 0;
|
||
UINT uiOffset = 0;
|
||
UINT uiAreaSize = 0;
|
||
UCHAR *pucSysUseArea = NULL;
|
||
BISO_SUSP_ENTRY_S *pstEntry = NULL;
|
||
|
||
DBGASSERT(NULL != pstFile);
|
||
DBGASSERT(NULL != pstParser);
|
||
DBGASSERT(NULL != pstRecord);
|
||
DBGASSERT(NULL != pstDirTree);
|
||
|
||
/* 没有使用Rock Ridge扩展则直接返回 */
|
||
if (0 == pstParser->ucRRIPVersion)
|
||
{
|
||
return BISO_SUCCESS;
|
||
}
|
||
|
||
/* 先申请POSIX INFO结构体内存 */
|
||
if (NULL == pstDirTree->pstPosixInfo)
|
||
{
|
||
pstDirTree->pstPosixInfo = (BISO_POSIX_INFO_S *)BISO_ZALLOC(sizeof(BISO_POSIX_INFO_S));
|
||
if (NULL == pstDirTree->pstPosixInfo)
|
||
{
|
||
return BISO_ERR_ALLOC_MEM;
|
||
}
|
||
}
|
||
|
||
/* 偏移到System Use字段所在的位置，注意Padding字段, 保证偏移为偶数 */
|
||
uiOffset = 33 + pstRecord->ucNameLen;
|
||
uiOffset += uiOffset & 0x1;
|
||
|
||
/* 再加上SP Entry中定义的SkipLen长度 */
|
||
uiOffset += pstParser->ucRRIPSkipLen;
|
||
|
||
/* 获取整个Syetem Use区域的数据(包括CE扩展区) */
|
||
pucSysUseArea = BISO_RRIP_GetSysUseArea(pstFile, (UCHAR *)pstRecord + uiOffset,
|
||
pstRecord->ucLength - (UCHAR)uiOffset, &uiAreaSize);
|
||
if (NULL == pucSysUseArea)
|
||
{
|
||
return BISO_ERR_ALLOC_MEM;
|
||
}
|
||
|
||
/* 遍历所有的RRIP表项 */
|
||
for(uiOffset = 0; uiOffset + 4 < uiAreaSize; uiOffset += pstEntry->ucEntryLen)
|
||
{
|
||
pstEntry = (BISO_SUSP_ENTRY_S *)(pucSysUseArea + uiOffset);
|
||
/* BISO_DUMP_ShowSUSPEntry(pstEntry); */
|
||
|
||
/* 找到对应的处理函数处理 */
|
||
for (i = 0; i < ARRAY_SIZE(g_astBISO_RRIP_ParseFunc); i++)
|
||
{
|
||
if (BOOL_TRUE == BISO_RRIP_IsThisType(pstEntry, g_astBISO_RRIP_ParseFunc[i].szSignature))
|
||
{
|
||
if (NULL != g_astBISO_RRIP_ParseFunc[i].pfFunc)
|
||
{
|
||
g_astBISO_RRIP_ParseFunc[i].pfFunc(pstEntry, pstDirTree);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
BISO_FREE(pucSysUseArea);
|
||
return BISO_SUCCESS;
|
||
}
|
||
|
||
ULONG BISO_RRIP_ReadIndicator(INOUT BISO_PARSER_S *pstParser)
|
||
{
|
||
ULONG ulRet;
|
||
UINT64 ui64Seek = 0;
|
||
BISO_DIR_RECORD_S *pstRootDir = NULL;
|
||
BISO_SUSP_ENTRY_SP_S *pstSPEntry = NULL;
|
||
UCHAR aucBuf[sizeof(BISO_DIR_RECORD_S) + sizeof(BISO_SUSP_ENTRY_SP_S)];
|
||
|
||
DBGASSERT(NULL != pstParser);
|
||
|
||
/* 读出Root Directory Record */
|
||
pstRootDir = &(pstParser->pstPVD->stRootDirRecord);
|
||
ui64Seek = BISO_BLOCK_SIZE * (UINT64)pstRootDir->uiExtent;
|
||
ulRet = BISO_UTIL_ReadFile(pstParser->szFileName, ui64Seek, sizeof(aucBuf), aucBuf);
|
||
if (BISO_SUCCESS != ulRet)
|
||
{
|
||
return ulRet;
|
||
}
|
||
|
||
/* 看看Root Directory Record的System Use字段里有没有SP Entry */
|
||
pstRootDir = (BISO_DIR_RECORD_S *)aucBuf;
|
||
pstSPEntry = (BISO_SUSP_ENTRY_SP_S *)(pstRootDir + 1);
|
||
if (('S' != pstSPEntry->cSignature1) || ('P' != pstSPEntry->cSignature2) ||
|
||
(0xBE != pstSPEntry->ucChkBE) || (0xEF != pstSPEntry->ucChkEF))
|
||
{
|
||
pstParser->ucRRIPVersion = 0;
|
||
pstParser->ucRRIPSkipLen = 0;
|
||
}
|
||
else
|
||
{
|
||
pstParser->ucRRIPVersion = pstSPEntry->ucVersion;
|
||
pstParser->ucRRIPSkipLen = pstSPEntry->ucSkipLen;
|
||
}
|
||
|
||
return BISO_SUCCESS;
|
||
}
|
||
|
||
|
||
|