scuffed-code/icu4c/source/test/letest/cmaps.cpp

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/***************************************************************************
*
* Copyright (C) 1998-2013, International Business Machines
* Corporation and others. All Rights Reserved.
*
************************************************************************/
#include "layout/LETypes.h"
#include "layout/LESwaps.h"
#include "sfnt.h"
#include "cmaps.h"
#include <stdio.h>
#define SWAPU16(code) ((LEUnicode16) SWAPW(code))
#define SWAPU32(code) ((LEUnicode32) SWAPL(code))
//
// Finds the high bit by binary searching
// through the bits in value.
//
le_int8 highBit(le_uint32 value)
{
le_uint8 bit = 0;
if (value >= 1 << 16) {
value >>= 16;
bit += 16;
}
if (value >= 1 << 8) {
value >>= 8;
bit += 8;
}
if (value >= 1 << 4) {
value >>= 4;
bit += 4;
}
if (value >= 1 << 2) {
value >>= 2;
bit += 2;
}
if (value >= 1 << 1) {
value >>= 1;
bit += 1;
}
return bit;
}
CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
{
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le_uint16 i;
le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
const CMAPEncodingSubtable *subtable = NULL;
le_bool found = FALSE;
le_uint16 foundPlatformID = 0xFFFF;
le_uint16 foundPlatformSpecificID = 0xFFFF;
le_uint32 foundOffset = 0;
le_uint16 foundTable = 0xFFFF;
// first pass, look for MS table. (preferred?)
for (i = 0; i < nSubtables && !found; i += 1) {
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const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
le_uint16 platformID = SWAPW(esh->platformID);
le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
if (platformID == 3) { // microsoft
switch (platformSpecificID) {
case 1: // Unicode BMP (UCS-2)
case 10: // Unicode UCS-4
foundOffset = SWAPL(esh->encodingOffset);
foundPlatformID = platformID;
foundPlatformSpecificID = platformSpecificID;
found = TRUE;
foundTable = i;
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break;
//default:
// 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);
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}
} else {
//printf("%s:%d: platform ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
}
}
// second pass, allow non MS table
// first pass, look for MS table. (preferred?)
for (i = 0; i < nSubtables && !found; i += 1) {
const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
le_uint16 platformID = SWAPW(esh->platformID);
le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
//printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
switch(platformID) {
case 0: // Unicode platform
switch(platformSpecificID) {
case 0:
case 1:
case 2:
case 3:
foundOffset = SWAPL(esh->encodingOffset);
foundPlatformID = platformID;
foundPlatformSpecificID = platformSpecificID;
foundTable = i;
found = TRUE;
break;
default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
}
break;
//default:
//printf("Skipping platform id %d\n", platformID);
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}
}
if (found)
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{
subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
//printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
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} else {
printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
return NULL;
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}
le_uint16 tableFormat = SWAPW(subtable->format);
//printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
switch (tableFormat) {
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case 4:
return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
case 12:
{
const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
}
default:
break;
}
printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
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return NULL;
}
CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
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: CMAPMapper(cmap)
{
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le_uint16 segCount = SWAPW(header->segCountX2) / 2;
fEntrySelector = SWAPW(header->entrySelector);
fRangeShift = SWAPW(header->rangeShift) / 2;
fEndCodes = &header->endCodes[0];
fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
fIdDelta = &fStartCodes[segCount];
fIdRangeOffset = &fIdDelta[segCount];
}
LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
{
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if (unicode32 >= 0x10000) {
return 0;
}
LEUnicode16 unicode = (LEUnicode16) unicode32;
le_uint16 index = 0;
le_uint16 probe = 1 << fEntrySelector;
TTGlyphID result = 0;
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if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
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index = fRangeShift;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
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index += probe;
}
}
if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
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if (fIdRangeOffset[index] == 0) {
result = (TTGlyphID) unicode;
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} else {
le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
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le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
result = SWAPW(glyphIndexTable[offset]);
}
result += SWAPW(fIdDelta[index]);
} else {
result = 0;
}
return LE_SET_GLYPH(0, result);
}
CMAPFormat4Mapper::~CMAPFormat4Mapper()
{
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// parent destructor does it all
}
CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
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: CMAPMapper(cmap), fGroups(groups)
{
le_uint8 bit = highBit(nGroups);
fPower = 1 << bit;
fRangeOffset = nGroups - fPower;
}
LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
{
le_int32 probe = fPower;
le_int32 range = 0;
if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
range = fRangeOffset;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
range += probe;
}
}
if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
}
return 0;
}
CMAPGroupMapper::~CMAPGroupMapper()
{
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// parent destructor does it all
}