NTFS: advanced file deletion
git-svn-id: svn://kolibrios.org@6401 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
pathoswithin
parent
7c539d8e19
commit
47b8ff4666
@ -3582,11 +3582,12 @@ ntfs_WriteFile:
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;----------------------------------------------------------------
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ntfs_Delete:
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xor ebx, ebx
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cmp byte [esi], 0
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jnz @f
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xor ebx, ebx
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movi eax, ERROR_ACCESS_DENIED
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ret
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@@:
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call ntfs_lock
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stdcall ntfs_find_lfn, [esp+4]
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@ -3595,13 +3596,89 @@ ntfs_Delete:
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jc ntfsDenied
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cmp [ebp+NTFS.fragmentCount], 1
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jnz ntfsUnsupported ; record fragmented
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test byte [eax+indexFlags], 1
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jnz ntfsUnsupported ; index has a subnode
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mov edx, [ebp+NTFS.cur_iRecord]
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shr edx, 3
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cmp edx, [ebp+NTFS.mftBitmapSize]
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jnc ntfsUnsupported
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; delete index from the node
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mov edx, [ebp+NTFS.secondIndexBuffer]
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mov byte [edx], 0
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mov edx, [ebp+NTFS.LastRead]
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mov [ebp+NTFS.nodeLastRead], edx
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test byte [eax+indexFlags], 1
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jz .deleteIndex ; no subnode
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movzx edx, word [eax+indexAllocatedSize]
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mov edi, eax
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mov eax, [eax+edx-8]
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mov edx, [ebp+NTFS.cur_size]
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push edx
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cmp edx, [ebp+NTFS.cur_subnode_size]
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jz @f
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mul [ebp+NTFS.sectors_per_cluster]
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@@:
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mov [ebp+NTFS.cur_attr], 0xA0
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mov [ebp+NTFS.cur_offs], eax
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push eax
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mov ebx, [ebp+NTFS.secondIndexBuffer]
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mov esi, ebx
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mov [ebp+NTFS.cur_buf], ebx
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call ntfs_read_attr.newAttribute
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pop [ebp+NTFS.cur_offs]
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pop eax
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jc ntfsFail
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cmp dword [esi], 'INDX'
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jnz ntfsFail
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mov [ebp+NTFS.cur_size], eax
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shl eax, 9
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call ntfs_restore_usa
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jc ntfsFail
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add esi, recordNode
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cmp byte [esi+nonLeafFlag], 0
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jnz ntfsUnsupported ; non leaf node
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add esi, [esi+indexOffset]
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test byte [esi+indexFlags], 2
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jnz .deleteSubnode ; empty node
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xor eax, eax
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@@:
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add esi, eax
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mov ax, [esi+indexAllocatedSize]
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test byte [esi+eax+indexFlags], 2
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jz @b
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movzx edx, word [edi+indexAllocatedSize]
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sub edx, eax
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sub edx, 8
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mov ebx, esi
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mov eax, edi
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jmp @f
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.deleteSubnode:
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mov esi, [ebp+NTFS.attr_offs]
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add esi, [esi+sizeWithHeader]
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cmp byte [esi], 0xB0
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jnz ntfsFail
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movzx eax, byte [esi+attributeOffset]
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add esi, eax
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mov eax, [ebp+NTFS.cur_offs]
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xor edx, edx
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div [ebp+NTFS.cur_size]
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mov edx, eax
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shr eax, 3
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and edx, 7
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btr [esi+eax], edx
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mov dx, [edi+indexAllocatedSize]
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mov eax, edi
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mov edi, [ebp+NTFS.secondIndexBuffer]
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mov byte [edi], 0
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xor ebx, ebx
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mov esi, [ebp+NTFS.cur_index_buf]
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cmp dword [esi], 'INDX'
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jnz @f
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mov esi, [ebp+NTFS.frs_buffer]
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mov ecx, [esi+recordRealSize]
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shr ecx, 2
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rep movsd
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jmp @f
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.deleteIndex:
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movzx edx, word [eax+indexAllocatedSize]
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mov ecx, [eax+fileRecordReference]
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cmp [eax+edx+fileRecordReference], ecx
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@ -3616,7 +3693,7 @@ ntfs_Delete:
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shr ecx, 2
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rep movsd
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mov esi, [ebp+NTFS.cur_index_buf]
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mov edi, [ebp+NTFS.attr_offs]
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mov edi, [ebp+NTFS.indexRoot]
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sub edi, [ebp+NTFS.frs_buffer]
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add edi, esi
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sub [edi+sizeWithHeader], edx
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@ -3629,24 +3706,59 @@ ntfs_Delete:
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add eax, edi
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sub [esi+recordRealSize], edx
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mov ecx, [esi+recordRealSize]
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cmp [esi+recordAllocatedSize], ecx
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jc ntfsUnsupported
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jmp @f
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.indexRecord:
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add edi, recordNode+nodeRealSize
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sub [edi], edx
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mov ecx, [edi]
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add edi, recordNode
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sub [edi+nodeRealSize], edx
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mov ecx, [edi+nodeRealSize]
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cmp [edi+nodeAllocatedSize], ecx
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jc ntfsUnsupported
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add ecx, recordNode
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@@:
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add ecx, [ebp+NTFS.cur_index_buf]
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sub ecx, eax
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shr ecx, 2
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mov esi, eax
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add esi, edx
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mov edi, eax
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test edx, edx
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jns @f
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neg edx
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add edx, ecx
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sub edx, 4
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add esi, edx
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add edi, edx
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std
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@@:
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jz @f
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shr ecx, 2
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rep movsd
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cld
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@@:
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test ebx, ebx
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jz @f
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; copy index from the subnode to replace deleted pointing index
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movzx ecx, word [ebx+indexAllocatedSize]
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mov edx, ecx
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shr ecx, 2
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mov esi, ebx
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mov edi, eax
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rep movsd
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mov edi, [ebp+NTFS.cur_index_buf]
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xchg [ebp+NTFS.secondIndexBuffer], edi
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mov [ebp+NTFS.cur_index_buf], edi
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add word [eax+indexAllocatedSize], 8
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mov byte [eax+indexFlags], 1
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mov eax, [ebp+NTFS.LastRead]
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mov [ebp+NTFS.nodeLastRead], eax
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; examine file record
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xchg [ebp+NTFS.nodeLastRead], eax
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mov [ebp+NTFS.rootLastRead], eax
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mov eax, ebx
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xor ebx, ebx
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jmp .indexRecord
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@@: ; examine file record
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mov [ebp+NTFS.cur_attr], 0x80
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mov [ebp+NTFS.cur_offs], 0
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mov [ebp+NTFS.cur_size], 0
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@ -3706,10 +3818,17 @@ ntfs_Delete:
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mov byte [esi+recordFlags], 0
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call writeRecord
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; write directory node
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mov eax, [ebp+NTFS.nodeLastRead]
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mov [ebp+NTFS.LastRead], eax
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mov eax, [ebp+NTFS.cur_index_buf]
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mov [ebp+NTFS.cur_buf], eax
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mov eax, [ebp+NTFS.nodeLastRead]
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mov [ebp+NTFS.LastRead], eax
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call writeRecord
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mov eax, [ebp+NTFS.secondIndexBuffer]
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cmp byte [eax], 0
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jz ntfsDone
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mov [ebp+NTFS.cur_buf], eax
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mov eax, [ebp+NTFS.rootLastRead]
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mov [ebp+NTFS.LastRead], eax
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call writeRecord
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jmp ntfsDone
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