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|
/* cmap.c -- Load and Print the content of cmap table
* Copyright (C) 1996 Li-Da Lho, All right reserved
*
* The structure of a cmap is really complex, it depends on which format the
* cmap is and loading a cmap is a kind of confusing thing.
* The structure of CMAP:
* A cmap begins with a general description of the table
* USHORT version indicates the version of this cmap.
* USHORT numEncodings is the number of encodings in the cmap table.
* Then follow 'numEncodings' of encoding tables, each of which contains
* the following informations for each subtable. The subtable contains the
* true data to map character code to glyph index
* USHORT PlatformID shows which platform the subtable is to be used
* (e.g. Mac, PC)
* USHORT Platfrom specific EncodingID shows what kind of encoding scheme
* this table uses (e.g. Big5, iso8859, Unicode etc.)
* ULONG offset is the offset from the beginning of the whole cmap table
* to the beginning of the corresponding subtable
* ----------------------- --- ---
* | USHORT version | ^ ^
* ----------------------- | |
* | USHORT numEncodings | | |
* ----------------------- | |
* | Encoding Table 1 | | |
* | USHORT PlatformID | | |
* | USHORT EncodingID | | |
* | ULONG offset 1 |------ | |
* ----------------------- | | offset 1 | offset 2
* | Encoding Table 2 | | | |
* | USHORT PlatformID | | | |
* | USHORT EncodingID | | | |
* | ULONG offset 2 |--- | v |
* ----------------------- | | --- |
* | Subtable 1 |<----- |
* | with format 0 | | v
* ----------------------- | ---
* | Subtable 2 |<--
* | with format 2 |
* ----------------------|
*
* Problem with Character Code vs. Byte Endianess.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "ttf.h"
#include "ttfutil.h"
/* $Id: cmap.c,v 1.1.1.1 1998/06/05 07:47:52 robert Exp $ */
typedef union _TwoBytes {
USHORT u;
unsigned char c[2];
} TwoBytes;
static void ttfLoadCMAP(FILE *fp,CMAPPtr cmap,ULONG offset);
static void ttfLoadEncodingTable(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfLoadSubTable(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfPrintSubTable(FILE* fp,SubTablePtr ptable);
static void ttfFreeSubTable(SubTablePtr ptable);
static void ttfLoadCMAP0(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfPrintCMAP0(FILE *fp,SubTablePtr subTable);
static USHORT ttfLookUpCMAP0(SubTablePtr subTable,USHORT cc);
static void ttfFreeCMAP0(SubTablePtr subTable);
static void ttfLoadCMAP2(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfPrintCMAP2(FILE *fp,SubTablePtr subTable);
static USHORT ttfLookUpCMAP2(SubTablePtr subTable,USHORT cc);
static void ttfFreeCMAP2(SubTablePtr subTable);
static void ttfLoadCMAP4(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfPrintCMAP4(FILE *fp,SubTablePtr subTable);
static USHORT ttfLookUpCMAP4(SubTablePtr subTable,USHORT cc);
static void ttfFreeCMAP4(SubTablePtr subTable);
static void ttfLoadCMAP6(FILE *fp,SubTablePtr subTable,ULONG offset);
static void ttfPrintCMAP6(FILE *fp, SubTablePtr sbuTable);
static USHORT ttfLookUpCMAP6(SubTablePtr subTable,USHORT cc);
static void ttfFreeCMAP6(SubTablePtr subTable);
void ttfInitCMAP(TTFontPtr font)
{
ULONG tag = FT_MAKE_TAG ('c', 'm', 'a', 'p');
TableDirPtr ptd;
if ((ptd = ttfLookUpTableDir(tag,font)) != NULL)
{
font->cmap = XCALLOC1 (CMAP);
ttfLoadCMAP(font->fp,font->cmap,ptd->offset);
}
}
static void ttfLoadCMAP(FILE *fp,CMAPPtr cmap,ULONG offset)
{
USHORT i,n;
ULONG posEnc; /* beginning of the Encoding Table */
ULONG baseSub = offset; /* base of SubTable offset */
xfseek(fp, offset, SEEK_SET, "ttfLoadCMAP");
cmap->version = ttfGetUSHORT(fp);
cmap->numberOfEncodings = n = ttfGetUSHORT(fp);
cmap->subTables = XCALLOC (cmap->numberOfEncodings, SubTable);
posEnc = baseSub + sizeof(USHORT)*2; /* step over the beginning of encoding
* table */
/* for each encoding scheme, load the encoding table (EncodingTable) and
* the real cmap data (SubTable) */
for (i=0;i<n;i++,posEnc += 8)
{ /* 8 == ushort*2 + ulong*1 */
ttfLoadEncodingTable(fp,cmap->subTables+i,posEnc);
ttfLoadSubTable(fp,cmap->subTables+i,baseSub);
}
}
void ttfPrintCMAP(FILE *fp,CMAPPtr cmap)
{
USHORT i;
fprintf(fp,"'cmap' Table - Character to Glyph Index Mapping Table\n");
fprintf(fp,"-----------------------------------------------------\n");
fprintf(fp,"\t 'cmap' version: %d\n",cmap->version);
fprintf(fp,"\t number of encoding: %d\n\n",cmap->numberOfEncodings);
for (i=0;i<cmap->numberOfEncodings;i++)
{
fprintf(fp,"Subtable %3d.\t",i);
ttfPrintSubTable(fp,cmap->subTables+i);
fprintf(fp,"\n");
}
}
USHORT ttfLookUpCMAP(SubTablePtr subTable,USHORT cc)
{
USHORT idx,format = subTable->format;
switch (format)
{
case 0:
idx = ttfLookUpCMAP0(subTable,cc);
break;
case 2:
idx = ttfLookUpCMAP2(subTable,cc);
break;
case 4:
idx = ttfLookUpCMAP4(subTable,cc);
break;
case 6:
idx = ttfLookUpCMAP6(subTable,cc);
break;
default:
ttfError("Unrecognized CMAP format\n");
return 0;
}
return idx;
}
SubTablePtr ttfSelectCMAP(CMAPPtr cmap, USHORT PlatformID, USHORT EncodingID)
{
USHORT i;
for (i=0;i<cmap->numberOfEncodings;i++)
{
if ((cmap->subTables+i)->PlatformID == PlatformID &&
(cmap->subTables+i)->EncodingID == EncodingID)
return cmap->subTables+i;
}
return NULL;
}
void ttfFreeCMAP(CMAPPtr cmap)
{
USHORT i;
for (i=0;i<cmap->numberOfEncodings;i++)
ttfFreeSubTable(cmap->subTables+i);
free(cmap->subTables);
free(cmap);
}
/* actually, EncodingTable is a part of SubTable */
static void ttfLoadEncodingTable(FILE *fp,SubTablePtr subTable,ULONG offset)
{
xfseek(fp, offset, SEEK_SET, "ttfLoadEncodingTable");
subTable->PlatformID = ttfGetUSHORT(fp);
subTable->EncodingID = ttfGetUSHORT(fp);
subTable->offset = ttfGetULONG(fp);
}
/* should this one be static ? */
static void ttfLoadSubTable(FILE *fp,SubTablePtr subTable,ULONG base)
{
ULONG pos;
USHORT format;
/* seek to the actuall position for this subtable
* base: beginning of cmap
* offset: offset field of each encoding table */
pos = base + subTable->offset;
xfseek(fp, pos, SEEK_SET, "ttfLoadSubTable");
subTable->format = format = ttfGetUSHORT(fp);
subTable->length = ttfGetUSHORT(fp);
subTable->version = ttfGetUSHORT(fp);
pos += 6;/* step over format independent data,USHORT*3 */
switch(format)
{
case 0:
ttfLoadCMAP0(fp,subTable,pos);
break;
case 2:
ttfLoadCMAP2(fp,subTable,pos);
break;
case 4:
ttfLoadCMAP4(fp,subTable,pos);
break;
case 6:
ttfLoadCMAP6(fp,subTable,pos);
break;
default:
ttfError("Unrecognized CMAP format\n");
}
}
static void ttfPrintSubTable(FILE* fp,SubTablePtr ptable)
{
USHORT format = ptable->format;
/* print encoding table */
fprintf(fp, " PlatformID: %2d\n",ptable->PlatformID);
fprintf(fp,"\t\t EcodingID: %2d\n",ptable->EncodingID);
fprintf(fp,"\t\t 'cmap' Offset: 0x%08x\n",ptable->offset);
/* print SubTable part */
fprintf(fp,"\t\t Length: %6d\n",ptable->length);
fprintf(fp,"\t\t Version: %6d\n",ptable->version);
switch(format)
{
case 0:
fprintf(fp,"\t\t Format 0 - Byte encoding table\n");
ttfPrintCMAP0(fp,ptable);
break;
case 2:
fprintf(fp,"\t\t Format 2 - High-byte mapping through table\n");
ttfPrintCMAP2(fp,ptable);
break;
case 4:
fprintf(fp,"\t\t Format 4 - Segment mapping to delta values\n");
ttfPrintCMAP4(fp,ptable);
break;
case 6:
fprintf(fp,"\t\t Format 6 - Trimmed table mapping\n");
ttfPrintCMAP6(fp,ptable);
break;
default:
ttfError("Unrecognized CMAP format\n");
}
}
static void ttfFreeSubTable(SubTablePtr ptable)
{
USHORT format = ptable->format;
switch(format)
{
case 0:
ttfFreeCMAP0(ptable);
break;
case 2:
ttfFreeCMAP2(ptable);
break;
case 4:
ttfFreeCMAP4(ptable);
break;
case 6:
ttfFreeCMAP6(ptable);
break;
}
}
static void ttfLoadCMAP0(FILE *fp,SubTablePtr subTable,ULONG offset)
{
BYTE * array;
subTable->map.cmap0 = XCALLOC1 (CMAP0);
array = subTable->map.cmap0->glyphIndexArray;
xfseek(fp, offset, SEEK_SET, "ttfLoadCMAP0");
/* Attention: we get lots of bytes at once as a work around of the
* usual ttfGet*, this cause byte sex trouble as will be seen
* in the fellowing procedures */
if (fread(array,sizeof(BYTE),256,fp) != 256)
ttfError("Error when getting glyphIndexArray\n");
}
static void ttfPrintCMAP0(FILE *fp,SubTablePtr subTable)
{
USHORT index;
int i;
for (i=0;i<256;i++)
{
index = ttfLookUpCMAP(subTable,i);
fprintf(fp,"\t\t Char %3d -> Index %4d\n",i,index);
}
}
static USHORT ttfLookUpCMAP0(SubTablePtr subTable,USHORT cc)
{
return subTable->map.cmap0->glyphIndexArray[cc & 0x00ff];
}
static void ttfFreeCMAP0(SubTablePtr subTable)
{
free(subTable->map.cmap0);
}
static void ttfLoadCMAP2(FILE *fp,SubTablePtr subTable,ULONG offset)
{
USHORT * array,i,n = 0;
USHORT numGlyphId;
SubHeaderPtr header;
xfseek(fp, offset, SEEK_SET, "ttfLoadCMAP2");
subTable->map.cmap2 = XCALLOC1 (CMAP2);
array = subTable->map.cmap2->subHeaderKeys;
ttfReadUSHORT (array, 256, fp);
for (i=0;i<256;i++)
{
array[i] /= 8;
if (n< array[i])
n = array[i]; /* find the max of subHeaderKeys */
}
n += 1; /* the number of subHeaders is one plus the max of subHeaderKeys */
subTable->map.cmap2->subHeaders = header = XCALLOC (n, SubHeader);
for (i=0;i<n;i++)
{
(header+i)->firstCode = ttfGetUSHORT(fp);
(header+i)->entryCount = ttfGetUSHORT(fp);
(header+i)->idDelta = ttfGetSHORT(fp);
(header+i)->idRangeOffset = ttfGetUSHORT(fp);
/* it makes things easier to let the offset starts from
* the beginning of glyphIndexArray */
if ((header+i)->idRangeOffset != 0)
(header+i)->idRangeOffset -= (sizeof(USHORT) +
(n-i-1) * sizeof(SubHeader)) ;
}
/* caculate the length of glyphIndexArray, this is ugly, there should be
* a better way to get this information. */
numGlyphId =
subTable->length - (256 + 3) * sizeof(USHORT) - n * sizeof(SubHeader);
numGlyphId /= sizeof(USHORT);
subTable->map.cmap2->glyphIndexArray = XCALLOC (numGlyphId, USHORT);
for (i=0;i<numGlyphId;i++)
{
subTable->map.cmap2->glyphIndexArray[i] = ttfGetUSHORT(fp);
}
}
static void ttfPrintCMAP2(FILE *fp,SubTablePtr subTable)
{
USHORT i,j,numGlyphId;
USHORT *array,n=0,index;
SubHeaderPtr header;
TwoBytes tb;
array = subTable->map.cmap2->subHeaderKeys;
header = subTable->map.cmap2->subHeaders;
for (i=0;i<256;i++)
{
/* find the number of subHeader */
if (n< array[i])
n = array[i];
fprintf(fp,"\t\t subHeaderKeys[%d] = %d\n",i,array[i]);
}
n += 1; /* the number of subHeaders is one plus the max of subHeaderKeys */
fprintf(fp,"\t\t Number of SubHeaders is %d\n",n);
for (i=0;i<=n;i++)
{
fprintf(fp,"\t\t SubHeader[%d]\n",i);
fprintf(fp,"\t\t firstCode \t 0x%04x\n",(header+i)->firstCode);
fprintf(fp,"\t\t entryCount \t %d\n",(header+i)->entryCount);
fprintf(fp,"\t\t idDelta \t %d\n",(header+i)->idDelta);
fprintf(fp,"\t\t idRangeOffset \t 0x%04x\n\n",
(header+i)->idRangeOffset);
}
/* caculate the length of glyphIndexArray, this is ugly, there should be
* a better way to get this information. */
numGlyphId =
subTable->length - (256 + 3) * sizeof(USHORT) - n * sizeof(SubHeader);
numGlyphId /= sizeof(USHORT);
fprintf(fp,"Number of glyphIndex: %d\n", numGlyphId);
for (i=0;i<numGlyphId;i++)
{
fprintf(fp,"\t\t glyphIdArray[%d] = %4d\n",i,
subTable->map.cmap2->glyphIndexArray[i]);
}
i = 0;
fprintf(fp,"\t\t First Byte:\t %2x\n",i);
tb.c[1] = i;
for(j=0;j<=255;j++)
{
tb.c[0] = j;
index = ttfLookUpCMAP2(subTable,tb.u);
fprintf(fp,"\t\t Char %2x -> Index %d\n",j,index);
}
for (i=128;i<=255;i++)
{
fprintf(fp,"\t\t First Byte:\t %2x\n",i);
tb.c[1] = i;
for(j=0;j<=255;j++)
{
tb.c[0] = j;
index = ttfLookUpCMAP2(subTable,tb.u);
fprintf(fp,"\t\t Char %2x -> Index %d\n",j,index);
}
}
}
static USHORT ttfLookUpCMAP2(SubTablePtr subTable,USHORT cc)
{
USHORT index,idx = 0;
USHORT *array = subTable->map.cmap2->subHeaderKeys;
SubHeaderPtr headers = subTable->map.cmap2->subHeaders;
SHORT idDelta;
USHORT firstCode, entryCount, idRangeOffset;
TwoBytes tb;
unsigned char first,second;
/* On little endian platforms "low byte" is the "first byte".
* It determines if it is necessary to use the second byte to
* fully interprete the character code; for example, if the first byte
* is obviously an ASCII character then it is not necessary to
* interpret the second byte, on the other hand, if the first byte is
* zero then the second byte is a ASCII char, when the first byte
* is not an ASCII char nor zero, those two bytes together determine
* the meanning of the character code
*/
tb.u = cc;
first = tb.c[1];
second = tb.c[0];
/* select which subHeader to use */
idx = array[first];
firstCode = (headers+idx)->firstCode;
entryCount = (headers+idx)->entryCount;
idDelta = (headers+idx)->idDelta;
idRangeOffset = (headers+idx)->idRangeOffset / sizeof (USHORT);
if (second >= firstCode && second < firstCode+entryCount)
{
/* use idRangeOffset to find where in the glyphIndexArray
* the correspinding index is */
idRangeOffset += (second - firstCode);
index = subTable->map.cmap2->glyphIndexArray[idRangeOffset];
if (index != 0)
/* if the character is not a missing character then
* add idDelta to it */
index += idDelta;
}
else
/* The second code is out ranged then return the
* missing glyph character */
index = 0;
return index;
}
static void ttfFreeCMAP2(SubTablePtr subTable)
{
free(subTable->map.cmap2->subHeaders);
free(subTable->map.cmap2->glyphIndexArray);
free(subTable->map.cmap2);
}
static void ttfLoadCMAP4(FILE *fp,SubTablePtr subTable,ULONG offset)
{
USHORT segCount;
USHORT len;
xfseek(fp, offset, SEEK_SET, "ttfLoadCMAP4");
subTable->map.cmap4 = XCALLOC1 (CMAP4);
subTable->map.cmap4->segCountX2 = segCount = ttfGetUSHORT(fp);
subTable->map.cmap4->searchRange = ttfGetUSHORT(fp);
subTable->map.cmap4->entrySelector = ttfGetUSHORT(fp);
subTable->map.cmap4->rangeShift = ttfGetUSHORT(fp);
segCount /= 2;
subTable->map.cmap4->endCount = ttfMakeUSHORT (segCount, fp);
subTable->map.cmap4->reservedPad = ttfGetUSHORT(fp);
subTable->map.cmap4->startCount = ttfMakeUSHORT (segCount, fp);
subTable->map.cmap4->idDelta = ttfMakeUSHORT (segCount, fp);
subTable->map.cmap4->idRangeOffset = ttfMakeUSHORT (segCount, fp);
/* caculate the length of glyphIndexArray, this is ugly, there should be
* a better way to get this information. */
len = subTable->length - 8*sizeof(USHORT) - 4*segCount*sizeof(USHORT);
len /= sizeof(USHORT);
subTable->map.cmap4->glyphIndexArray = ttfMakeUSHORT (len, fp);
}
static void ttfPrintCMAP4(FILE *fp,SubTablePtr subTable)
{
USHORT i;
USHORT segCount,len;
segCount = subTable->map.cmap4->segCountX2/2;
fprintf(fp, "\t\t segCount:\t %d\n", segCount);
fprintf(fp, "\t\t searchRange:\t %d\n", subTable->map.cmap4->searchRange);
fprintf(fp, "\t\t entrySelector:\t %d\n", subTable->map.cmap4->entrySelector);
fprintf(fp, "\t\t rangeShift:\t %d\n", subTable->map.cmap4->rangeShift);
for (i=0;i<segCount;i++)
{
fprintf(fp, "\t\t Seg %3d :", i);
fprintf(fp, " St = %04x,", subTable->map.cmap4->startCount[i]);
fprintf(fp, " En = %04x,", subTable->map.cmap4->endCount[i]);
/* should this filed be SHORT or USHORT ?? */
fprintf(fp, " D = %6d," ,
(subTable->map.cmap4->idDelta[i]));
fprintf(fp, " RO = %6d," , subTable->map.cmap4->idRangeOffset[i]);
/* find the glyphIndex correpsonding to this segment */
if (subTable->map.cmap4->idRangeOffset[i] != 0)
{
USHORT j;
j = subTable->map.cmap4->segCountX2/2 - i;
j = subTable->map.cmap4->idRangeOffset[i] -
j*sizeof(USHORT);
fprintf(fp, " gId# = %d\n", (int) (j/sizeof(USHORT)));
}
else
fprintf(fp, " gId# = N/A\n");
}
/* caculate the length of glyphIndexArray, this is ugly, there should be
* a better way to get this information. */
len = subTable->length - 8*sizeof(USHORT) - 4*segCount*sizeof(USHORT);
len /= sizeof(USHORT);
fprintf(fp,"\t\t Number of glyphIndex %d\n",len);
for (i=0;i<len;i++)
{
fprintf(fp,"\t\t glyphIdArray[%d] = %d\n",i,
subTable->map.cmap4->glyphIndexArray[i]);
}
for (i=0;i<segCount;i++)
{
int j,index;
fprintf(fp,"Segment %d:\n",i);
for (j=subTable->map.cmap4->startCount[i];
j<=subTable->map.cmap4->endCount[i];j++)
{
index = ttfLookUpCMAP4(subTable,j);
fprintf(fp,"\t\tChar 0x%04x -> Index %d\n",j,index);
}
}
}
static USHORT ttfLookUpCMAP4(SubTablePtr subTable,USHORT cc)
{
USHORT i;
USHORT index=0, segCount = subTable->map.cmap4->segCountX2/2;
for (i=0;i<segCount;i++)
{
if (cc <= subTable->map.cmap4->endCount[i] &&
cc >= subTable->map.cmap4->startCount[i])
{
USHORT j;
if (subTable->map.cmap4->idRangeOffset[i] != 0)
{
j = subTable->map.cmap4->idRangeOffset[i] -
(segCount - i)*sizeof(USHORT);
j = cc - subTable->map.cmap4->startCount[i] + j/2;
index = subTable->map.cmap4->glyphIndexArray[j];
if (index != 0)
index += subTable->map.cmap4->idDelta[i];
}
else
{
index = cc + subTable->map.cmap4->idDelta[i];
}
break;
}
}
return index;
}
static void ttfFreeCMAP4(SubTablePtr subTable)
{
free(subTable->map.cmap4->endCount);
free(subTable->map.cmap4->startCount);
free(subTable->map.cmap4->idDelta);
free(subTable->map.cmap4->idRangeOffset);
free(subTable->map.cmap4->glyphIndexArray);
free(subTable->map.cmap4);
}
static void ttfLoadCMAP6(FILE *fp,SubTablePtr subTable,ULONG offset)
{
USHORT len;
xfseek(fp, offset, SEEK_SET, "ttfLoadCMAP6");
subTable->map.cmap6 = XCALLOC1 (CMAP6);
subTable->map.cmap6->firstCode = ttfGetUSHORT(fp);
subTable->map.cmap6->entryCount = len = ttfGetUSHORT(fp);
subTable->map.cmap6->glyphIndexArray = ttfMakeUSHORT (len, fp);
}
static void ttfPrintCMAP6(FILE *fp, SubTablePtr subTable)
{
USHORT i;
fprintf(fp,"\t\t First Code: 0x%04x\n",subTable->map.cmap6->firstCode);
fprintf(fp,"\t\t Entry Count: %d\n",subTable->map.cmap6->entryCount);
for (i=0;i<subTable->map.cmap6->entryCount;i++)
{
fprintf(fp,"\t\t glyphIdArray[%d] = %d\n",i,
subTable->map.cmap6->glyphIndexArray[i]);
}
}
static USHORT ttfLookUpCMAP6(SubTablePtr subTable,USHORT cc)
{
USHORT index;
index = cc - subTable->map.cmap6->firstCode;
if (index < subTable->map.cmap6->entryCount)
return subTable->map.cmap6->glyphIndexArray[index];
else
/* index out of range, return missing glyph */
return 0;
}
static void ttfFreeCMAP6(SubTablePtr subTable)
{
free(subTable->map.cmap6->glyphIndexArray);
free(subTable->map.cmap6);
}
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