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| #include <sstream>
#include <fstream>
#include <ios>
using namespace std;
//This is TTF file header
typedef struct _tagTT_OFFSET_TABLE
{
unsigned short uMajorVersion;
unsigned short uMinorVersion;
unsigned short uNumOfTables;
unsigned short uSearchRange;
unsigned short uEntrySelector;
unsigned short uRangeShift;
}TT_OFFSET_TABLE;
//Tables in TTF file and there placement and name (tag)
typedef struct _tagTT_TABLE_DIRECTORY
{
char* szTag; //table name
unsigned long uCheckSum; //Check sum
unsigned long uOffset; //Offset from beginning of file
unsigned long uLength; //length of the table in bytes
}TT_TABLE_DIRECTORY;
//Header of names table
typedef struct _tagTT_NAME_TABLE_HEADER
{
unsigned short uFSelector; //format selector. Always 0
unsigned short uNRCount; //Name Records count
unsigned short uStorageOffset; //Offset for strings storage, from start of the table
}TT_NAME_TABLE_HEADER;
//Record in names table
typedef struct _tagTT_NAME_RECORD
{
unsigned short uPlatformID;
unsigned short uEncodingID;
unsigned short uLanguageID;
unsigned short uNameID;
unsigned short uStringLength;
unsigned short uStringOffset; //from start of storage area
}TT_NAME_RECORD;
string IntToHex( int i )
{
if (i < 0) i = 256+i;
char* c = new char[256];
itoa(i, c, 16);
string s = c;
delete c;
if (s.size() == 1)
s = "0" + s;
else if (s.size() == 0)
s = "00";
return s;
}
int HexToInt( const char* c )
{
int i;
i = strtol(c, NULL, 16);
return i;
}
unsigned long HexToULong( const char* c )
{
unsigned long u;
stringstream iss;
iss << c;
iss >> std::hex >> u;
return u;
}
void GetErrors(fstream* f)
{
if (f->eof())
prinft("#Error : end of file");
if (f->bad())
prinft("#Error : bad");
else if (f->fail())
prinft("#Error : fail");
}
unsigned short GetUSHORT(fstream* f, int* pos)
{
if (f->good() && *pos != -1)
{
f->seekg(*pos);
char* tmp = new char[256];
f->read(tmp, sizeof(unsigned short));
string s = "";
int i1 = tmp[0]; int i2 = tmp[1];
s += IntToHex(i1);
s += IntToHex(i2);
unsigned short u = HexToInt(s.c_str());
*pos += sizeof(unsigned short);
delete tmp;
return u;
}
else
{
GetErrors(f);
*pos = -1;
return 0;
}
}
unsigned long GetULONG(fstream* f, int* pos)
{
if (f->good() && *pos != -1)
{
f->seekg(*pos);
char* tmp = new char[256];
f->read(tmp, sizeof(unsigned long));
string s = "";
int i1 = tmp[0]; int i2 = tmp[1]; int i3 = tmp[2]; int i4 = tmp[3];
s += IntToHex(i1);
s += IntToHex(i2);
s += IntToHex(i3);
s += IntToHex(i4);
unsigned long u = HexToULong(s.c_str());
*pos += sizeof(unsigned long);
delete tmp;
return u;
}
else
{
GetErrors(f);
*pos = -1;
return 0;
}
}
string GetFontName(string lpszFilePath)
{
fstream f(lpszFilePath.c_str(), ios::in | ios::binary);
string csRetVal = "";
//lpszFilePath is the path to our font file
if (f.is_open())
{
//define and read file header
TT_OFFSET_TABLE ttOffsetTable;
int pos = ios::beg;
ttOffsetTable.uMajorVersion = GetUSHORT(&f, &pos);
ttOffsetTable.uMinorVersion = GetUSHORT(&f, &pos);
ttOffsetTable.uNumOfTables = GetUSHORT(&f, &pos);
ttOffsetTable.uSearchRange = GetUSHORT(&f, &pos);
ttOffsetTable.uEntrySelector = GetUSHORT(&f, &pos);
ttOffsetTable.uRangeShift = GetUSHORT(&f, &pos);
if (pos == -1)
return csRetVal;
//check is this is a true type font and the version is 1.0
if(ttOffsetTable.uMajorVersion != 1 || ttOffsetTable.uMinorVersion != 0)
return csRetVal;
TT_TABLE_DIRECTORY tblDir;
bool bFound = false;
string csTemp;
for (int i=0; i< ttOffsetTable.uNumOfTables; i++)
{
tblDir.szTag = new char[4];
f.read(tblDir.szTag, sizeof(char[4]));
pos += sizeof(char[4]);
tblDir.uCheckSum = GetULONG(&f, &pos);
tblDir.uOffset = GetULONG(&f, &pos);
tblDir.uLength = GetULONG(&f, &pos);
if (pos == -1)
return csRetVal;
//table's tag cannot exceed 4 characters
csTemp = tblDir.szTag;
csTemp.erase(4);
delete tblDir.szTag;
if (csTemp == "name")
{
//we found our table
bFound = true;
break;
}
}
if (bFound)
{
//move to offset we got from Offsets Table
pos = tblDir.uOffset;
TT_NAME_TABLE_HEADER ttNTHeader;
ttNTHeader.uFSelector = GetUSHORT(&f, &pos);
ttNTHeader.uNRCount = GetUSHORT(&f, &pos);
ttNTHeader.uStorageOffset = GetUSHORT(&f, &pos);
if (pos == -1)
return csRetVal;
TT_NAME_RECORD ttRecord;
bFound = true;
for (int i=0; i<ttNTHeader.uNRCount; i++)
{
ttRecord.uPlatformID = GetUSHORT(&f, &pos);
ttRecord.uEncodingID = GetUSHORT(&f, &pos);
ttRecord.uLanguageID = GetUSHORT(&f, &pos);
ttRecord.uNameID = GetUSHORT(&f, &pos);
ttRecord.uStringLength = GetUSHORT(&f, &pos);
ttRecord.uStringOffset = GetUSHORT(&f, &pos);
if (pos == -1)
return csRetVal;
//1 says that this is font name. 0 for example determines copyright info
if (ttRecord.uNameID == 1)
{
//save file position, so we can return to continue with search
int nPos = f.tellg();
f.seekg(tblDir.uOffset + ttRecord.uStringOffset + ttNTHeader.uStorageOffset);
char* lpszNameBuf = new char[ttRecord.uStringLength + 1];
f.read(lpszNameBuf, ttRecord.uStringLength);
csTemp = lpszNameBuf;
//yes, still need to check if the font name is not empty
//if it is, continue the search
if (csTemp.length() > 0)
{
csRetVal = csTemp.erase(ttRecord.uStringLength);
break;
}
}
}
}
}
return csRetVal;
} |
