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      1 /***************************************************************************
      2 *
      3 *   Copyright (C) 1998-2013, International Business Machines
      4 *   Corporation and others.  All Rights Reserved.
      5 *
      6 ************************************************************************/
      7 
      8 #include "layout/LETypes.h"
      9 #include "layout/LESwaps.h"
     10 
     11 #include "sfnt.h"
     12 #include "cmaps.h"
     13 #include <stdio.h>
     14 
     15 #define SWAPU16(code) ((LEUnicode16) SWAPW(code))
     16 #define SWAPU32(code) ((LEUnicode32) SWAPL(code))
     17 
     18 //
     19 // Finds the high bit by binary searching
     20 // through the bits in value.
     21 //
     22 le_int8 highBit(le_uint32 value)
     23 {
     24     le_uint8 bit = 0;
     25 
     26     if (value >= 1 << 16) {
     27         value >>= 16;
     28         bit += 16;
     29     }
     30 
     31     if (value >= 1 << 8) {
     32         value >>= 8;
     33         bit += 8;
     34     }
     35 
     36     if (value >= 1 << 4) {
     37         value >>= 4;
     38         bit += 4;
     39     }
     40 
     41     if (value >= 1 << 2) {
     42         value >>= 2;
     43         bit += 2;
     44     }
     45 
     46     if (value >= 1 << 1) {
     47         value >>= 1;
     48         bit += 1;
     49     }
     50 
     51     return bit;
     52 }
     53 
     54 CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
     55 {
     56     le_uint16 i;
     57     le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
     58     const CMAPEncodingSubtable *subtable = NULL;
     59     le_bool found = FALSE;
     60     le_uint16 foundPlatformID = 0xFFFF;
     61     le_uint16 foundPlatformSpecificID = 0xFFFF;
     62     le_uint32 foundOffset = 0;
     63     le_uint16 foundTable = 0xFFFF;
     64     // first pass, look for MS table. (preferred?)
     65     for (i = 0; i < nSubtables && !found; i += 1) {
     66         const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
     67 
     68         le_uint16 platformID = SWAPW(esh->platformID);
     69         le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
     70         if (platformID == 3) { // microsoft
     71           switch (platformSpecificID) {
     72             case 1: // Unicode BMP (UCS-2)
     73             case 10: // Unicode UCS-4
     74                 foundOffset = SWAPL(esh->encodingOffset);
     75                 foundPlatformID = platformID;
     76                 foundPlatformSpecificID = platformSpecificID;
     77                 found = TRUE;
     78                 foundTable = i;
     79                 break;
     80 
     81                 //default:
     82               //              printf("%s:%d: microsoft (3) platform specific ID %d (wanted 1 or 10) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformSpecificID)), i, nSubtables);
     83             }
     84         } else {
     85           //printf("%s:%d: platform  ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
     86         }
     87     }
     88 
     89     // second pass, allow non MS table
     90     // first pass, look for MS table. (preferred?)
     91       for (i = 0; i < nSubtables && !found; i += 1) {
     92         const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
     93         le_uint16 platformID = SWAPW(esh->platformID);
     94         le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
     95         //printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
     96         switch(platformID) {
     97         case 0: // Unicode platform
     98           switch(platformSpecificID) {
     99           case 0:
    100           case 1:
    101           case 2:
    102           case 3:
    103             foundOffset = SWAPL(esh->encodingOffset);
    104             foundPlatformID = platformID;
    105             foundPlatformSpecificID = platformSpecificID;
    106             foundTable = i;
    107             found = TRUE;
    108             break;
    109 
    110           default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
    111           }
    112           break;
    113 
    114           //default:
    115           //printf("Skipping platform id %d\n", platformID);
    116         }
    117     }
    118 
    119 
    120     if (found)
    121     {
    122       subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
    123       //printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
    124     } else {
    125       printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
    126       return NULL;
    127     }
    128 
    129     le_uint16 tableFormat = SWAPW(subtable->format);
    130     //printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
    131 
    132     switch (tableFormat) {
    133     case 4:
    134         return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
    135 
    136     case 12:
    137     {
    138         const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
    139 
    140         return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
    141     }
    142 
    143     default:
    144         break;
    145     }
    146 
    147     printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
    148     return NULL;
    149 }
    150 
    151 CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
    152     : CMAPMapper(cmap)
    153 {
    154     le_uint16 segCount = SWAPW(header->segCountX2) / 2;
    155 
    156     fEntrySelector = SWAPW(header->entrySelector);
    157     fRangeShift = SWAPW(header->rangeShift) / 2;
    158     fEndCodes = &header->endCodes[0];
    159     fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
    160     fIdDelta = &fStartCodes[segCount];
    161     fIdRangeOffset = &fIdDelta[segCount];
    162 }
    163 
    164 LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
    165 {
    166     if (unicode32 >= 0x10000) {
    167         return 0;
    168     }
    169 
    170     LEUnicode16 unicode = (LEUnicode16) unicode32;
    171     le_uint16 index = 0;
    172     le_uint16 probe = 1 << fEntrySelector;
    173     TTGlyphID result = 0;
    174 
    175     if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
    176         index = fRangeShift;
    177     }
    178 
    179     while (probe > (1 << 0)) {
    180         probe >>= 1;
    181 
    182         if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
    183             index += probe;
    184         }
    185     }
    186 
    187     if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
    188         if (fIdRangeOffset[index] == 0) {
    189             result = (TTGlyphID) unicode;
    190         } else {
    191             le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
    192             le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
    193             le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
    194 
    195             result = SWAPW(glyphIndexTable[offset]);
    196         }
    197 
    198         result += SWAPW(fIdDelta[index]);
    199     } else {
    200         result = 0;
    201     }
    202 
    203     return LE_SET_GLYPH(0, result);
    204 }
    205 
    206 CMAPFormat4Mapper::~CMAPFormat4Mapper()
    207 {
    208     // parent destructor does it all
    209 }
    210 
    211 CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
    212     : CMAPMapper(cmap), fGroups(groups)
    213 {
    214     le_uint8 bit = highBit(nGroups);
    215     fPower = 1 << bit;
    216     fRangeOffset = nGroups - fPower;
    217 }
    218 
    219 LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
    220 {
    221     le_int32 probe = fPower;
    222     le_int32 range = 0;
    223 
    224     if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
    225         range = fRangeOffset;
    226     }
    227 
    228     while (probe > (1 << 0)) {
    229         probe >>= 1;
    230 
    231         if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
    232             range += probe;
    233         }
    234     }
    235 
    236     if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
    237         return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
    238     }
    239 
    240     return 0;
    241 }
    242 
    243 CMAPGroupMapper::~CMAPGroupMapper()
    244 {
    245     // parent destructor does it all
    246 }
    247 
    248