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| author | Qing Huang <qing.huang@intel.com> | 2007-12-20 09:16:45 +0000 |
|---|---|---|
| committer | Jordan Justen <jordan.l.justen@intel.com> | 2016-04-06 23:22:43 -0700 |
| commit | b9ec93308b33bcb0bb37d6213a76c3fed0b5bc0b (patch) | |
| tree | ed4cc299df8f82781a6e6fae2022d2411ddc9c89 /FatPkg/EnhancedFatDxe/Hash.c | |
| parent | f0dc69e61bf2316dcf7cc75eb7e4ba374a5b2832 (diff) | |
| download | edk2-b9ec93308b33bcb0bb37d6213a76c3fed0b5bc0b.tar.gz edk2-b9ec93308b33bcb0bb37d6213a76c3fed0b5bc0b.tar.bz2 edk2-b9ec93308b33bcb0bb37d6213a76c3fed0b5bc0b.zip | |
Add EDK II Prime FatPkg New Feature: Support both Unicode Collation and Unicode Collation 2 Protocols Support both Component Name and Component Name 2 Protocol.
(based on FatPkg commit e51cd032db84a6fb1f44a0605f80d96f5fdf4bc6)
[jordan.l.justen@intel.com: Use script to relicense to 2-clause BSD]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Mark Doran <mark.doran@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'FatPkg/EnhancedFatDxe/Hash.c')
| -rw-r--r-- | FatPkg/EnhancedFatDxe/Hash.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/FatPkg/EnhancedFatDxe/Hash.c b/FatPkg/EnhancedFatDxe/Hash.c new file mode 100644 index 0000000000..c0fbab2f1e --- /dev/null +++ b/FatPkg/EnhancedFatDxe/Hash.c @@ -0,0 +1,217 @@ +/*++
+
+Copyright (c) 2005 - 2007, Intel Corporation
+All rights reserved. This program and the accompanying materials are licensed and made available
+under the terms and conditions of the BSD License which accompanies this
+distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+Module Name:
+
+ Hash.c
+
+Abstract:
+
+ Hash table operations
+
+Revision History
+
+--*/
+
+#include "Fat.h"
+
+STATIC
+UINT32
+FatHashLongName (
+ IN CHAR16 *LongNameString
+ )
+/*++
+
+Routine Description:
+
+ Get hash value for long name.
+
+Arguments:
+
+ LongNameString - The long name string to be hashed.
+
+Returns:
+
+ HashValue.
+
+--*/
+{
+ UINT32 HashValue;
+ CHAR16 UpCasedLongFileName[EFI_PATH_STRING_LENGTH];
+ StrCpy (UpCasedLongFileName, LongNameString);
+ FatStrUpr (UpCasedLongFileName);
+ gBS->CalculateCrc32 (UpCasedLongFileName, StrSize (UpCasedLongFileName), &HashValue);
+ return (HashValue & HASH_TABLE_MASK);
+}
+
+STATIC
+UINT32
+FatHashShortName (
+ IN CHAR8 *ShortNameString
+ )
+/*++
+
+Routine Description:
+
+ Get hash value for short name.
+
+Arguments:
+
+ ShortNameString - The short name string to be hashed.
+
+Returns:
+
+ HashValue
+
+--*/
+{
+ UINT32 HashValue;
+ gBS->CalculateCrc32 (ShortNameString, FAT_NAME_LEN, &HashValue);
+ return (HashValue & HASH_TABLE_MASK);
+}
+
+FAT_DIRENT **
+FatLongNameHashSearch (
+ IN FAT_ODIR *ODir,
+ IN CHAR16 *LongNameString
+ )
+/*++
+
+Routine Description:
+
+ Search the long name hash table for the directory entry.
+
+Arguments:
+
+ ODir - The directory to be searched.
+ LongNameString - The long name string to search.
+
+Returns:
+
+ The previous long name hash node of the directory entry.
+
+--*/
+{
+ FAT_DIRENT **PreviousHashNode;
+ for (PreviousHashNode = &ODir->LongNameHashTable[FatHashLongName (LongNameString)];
+ *PreviousHashNode != NULL;
+ PreviousHashNode = &(*PreviousHashNode)->LongNameForwardLink
+ ) {
+ if (FatStriCmp (LongNameString, (*PreviousHashNode)->FileString) == 0) {
+ break;
+ }
+ }
+
+ return PreviousHashNode;
+}
+
+FAT_DIRENT **
+FatShortNameHashSearch (
+ IN FAT_ODIR *ODir,
+ IN CHAR8 *ShortNameString
+ )
+/*++
+
+Routine Description:
+
+ Search the short name hash table for the directory entry.
+
+Arguments:
+
+ ODir - The directory to be searched.
+ ShortNameString - The short name string to search.
+
+Returns:
+
+ The previous short name hash node of the directory entry.
+
+--*/
+{
+ FAT_DIRENT **PreviousHashNode;
+ for (PreviousHashNode = &ODir->ShortNameHashTable[FatHashShortName (ShortNameString)];
+ *PreviousHashNode != NULL;
+ PreviousHashNode = &(*PreviousHashNode)->ShortNameForwardLink
+ ) {
+ if (CompareMem (ShortNameString, (*PreviousHashNode)->Entry.FileName, FAT_NAME_LEN) == 0) {
+ break;
+ }
+ }
+
+ return PreviousHashNode;
+}
+
+VOID
+FatInsertToHashTable (
+ IN FAT_ODIR *ODir,
+ IN FAT_DIRENT *DirEnt
+ )
+/*++
+
+Routine Description:
+
+ Insert directory entry to hash table.
+
+Arguments:
+
+ ODir - The parent directory.
+ DirEnt - The directory entry node.
+
+Returns:
+
+ None.
+
+--*/
+{
+ FAT_DIRENT **HashTable;
+ UINT32 HashTableIndex;
+
+ //
+ // Insert hash table index for short name
+ //
+ HashTableIndex = FatHashShortName (DirEnt->Entry.FileName);
+ HashTable = ODir->ShortNameHashTable;
+ DirEnt->ShortNameForwardLink = HashTable[HashTableIndex];
+ HashTable[HashTableIndex] = DirEnt;
+ //
+ // Insert hash table index for long name
+ //
+ HashTableIndex = FatHashLongName (DirEnt->FileString);
+ HashTable = ODir->LongNameHashTable;
+ DirEnt->LongNameForwardLink = HashTable[HashTableIndex];
+ HashTable[HashTableIndex] = DirEnt;
+}
+
+VOID
+FatDeleteFromHashTable (
+ IN FAT_ODIR *ODir,
+ IN FAT_DIRENT *DirEnt
+ )
+/*++
+
+Routine Description:
+
+ Delete directory entry from hash table.
+
+Arguments:
+
+ ODir - The parent directory.
+ DirEnt - The directory entry node.
+
+Returns:
+
+ None.
+
+--*/
+{
+ *FatShortNameHashSearch (ODir, DirEnt->Entry.FileName) = DirEnt->ShortNameForwardLink;
+ *FatLongNameHashSearch (ODir, DirEnt->FileString) = DirEnt->LongNameForwardLink;
+}
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