fsck_hfs/dfalib/DecompDataEnums.h

   1 /*
   2         File:           DecompDataEnums.h
   3
   4         Contains:       Constants for data tables used with FixDecomps (CatalogCheck.c)
   5
   6         Copyright:      © 2002 by Apple Computer, Inc., all rights reserved.
   7
   8         CVS change log:
   9
  10                 $Log: DecompDataEnums.h,v $
  11                 Revision 1.2  2002/12/20 01:20:36  lindak
  12                 Merged PR-2937515-2 into ZZ100
  13                 Old HFS+ decompositions need to be repaired
  14
  15                 Revision 1.1.4.1  2002/12/16 18:55:22  jcotting
  16                 integrated code from text group (Peter Edberg) that will correct some
  17                 illegal names created with obsolete Unicode 2.1.2 decomposition rules
  18                 Bug #: 2937515
  19                 Submitted by: jerry cottingham
  20                 Reviewed by: don brady
  21
  22                 Revision 1.1.2.1  2002/10/25 17:15:22  jcotting
  23                 added code from Peter Edberg that will detect and offer replacement
  24                 names for file system object names with pre-Jaguar decomp errors
  25                 Bug #: 2937515
  26                 Submitted by: jerry cottingham
  27                 Reviewed by: don brady
  28
  29                 Revision 1.1  2002/10/16 06:33:25  pedberg
  30                 Initial working version of function and related tools and tables
  31
  32
  33 */
  34
  35 #ifndef __DECOMPDATAENUMS__
  36 #define __DECOMPDATAENUMS__
  37
  38 // Basic table parameters for 2-stage trie:
  39 // The high 12 bits of a UniChar provide an index into a first-level table;
  40 // if the entry there is >= 0, it is an index into a table of 16-element
  41 // ranges indexed by the low 4 bits of the UniChar. Since the UniChars of interest
  42 // for combining classes and sequence updates are either in the range 0000-30FF
  43 // or in the range FB00-FFFF, we eliminate the large middle section of the first-
  44 // level table by first adding 0500 to the UniChar to wrap the UniChars of interest
  45 // into the range 0000-35FF.
  46 enum {
  47         kLoFieldBitSize         = 4,
  48         kShiftUniCharOffset     = 0x0500,       // add to UniChar so FB00 & up wraps to 0000
  49         kShiftUniCharLimit      = 0x3600        // if UniChar + offset >= limit, no need to check
  50 };
  51
  52 // The following are all derived from kLoFieldBitSize
  53 enum {
  54         kLoFieldEntryCount      = 1 << kLoFieldBitSize,
  55         kHiFieldEntryCount      = kShiftUniCharLimit >> kLoFieldBitSize,
  56         kLoFieldMask            = (1 << kLoFieldBitSize) - 1
  57 };
  58
  59 // Action codes for sequence replacement/updating
  60 enum {                                                                                  // next + repl = total chars
  61         // a value of 0 means no action
  62         kReplaceCurWithTwo                                      = 0x02, //    0 + 2 = 2
  63         kReplaceCurWithThree                            = 0x03, //    0 + 3 = 3
  64         kIfNextOneMatchesReplaceAllWithOne      = 0x12, //    1 + 1 = 2
  65         kIfNextOneMatchesReplaceAllWithTwo      = 0x13, //    1 + 2 = 3
  66         kIfNextTwoMatchReplaceAllWithOne        = 0x23  //    2 + 1 = 3
  67 };
  68
  69 #endif // __FSCKFIXDECOMPS__
  70
  71