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/****************************************************************************
*
* tfmobjs.c
*
* FreeType auxiliary TFM module.
*
* Copyright 1996-2018 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_TFM_H
#include "tfmobjs.h"
#include "tfmmod.h"
#include "tfmerr.h"
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT trace_tfmobjs
/**************************************************************************
*
* Global TFM parameters.
*
*/
#define tfm_size 30000 /* maximum length of tfm data, in bytes */
#define lig_size 5000 /* maximum length of lig kern program, in words */
#define hash_size 5003
/**************************************************************************
*
* TFM font utility functions.
*
*/
long tfm_read_intn(FT_Stream,int);
unsigned long tfm_read_uintn(FT_Stream,int);
#define READ_UINT1( stream ) (FT_ULong)tfm_read_uintn( stream, 1)
#define READ_UINT2( stream ) (FT_ULong)tfm_read_uintn( stream, 2)
#define READ_UINT4( stream ) (FT_ULong)tfm_read_uintn( stream, 4)
#define READ_INT4( stream ) (FT_Long)tfm_read_intn( stream, 4)
/*
* Reading a Number from file
*/
unsigned long
tfm_read_uintn(FT_Stream stream, int size)
{
unsigned long v,k;
FT_Error error = FT_Err_Ok;
FT_Byte tp;
v = 0L;
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0;
k =(unsigned long)tp;
v = v*256L + k;
--size;
}
return v;
}
long
tfm_read_intn(FT_Stream stream, int size)
{
long v;
FT_Byte tp;
FT_Error error= FT_Err_Ok;
unsigned long z ;
if ( FT_READ_BYTE(tp) )
return 0;
z= (unsigned long)tp;
v = (long)z & 0xffL;
if (v & 0x80L)
v = v - 256L;
--size;
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0;
z= (unsigned long)tp;
v = v*256L + z;
--size;
}
return v;
}
/**************************************************************************
*
* API.
*
*/
FT_LOCAL_DEF( FT_Error )
tfm_init( TFM_Parser parser,
FT_Memory memory,
FT_Stream stream )
{
parser->memory = memory;
parser->stream = stream;
parser->FontInfo = NULL;
parser->user_data = NULL;
return FT_Err_Ok;
}
FT_LOCAL( void )
tfm_close( TFM_Parser parser )
{
FT_UNUSED( parser );
/* nothing */
}
FT_LOCAL_DEF( FT_Error )
tfm_parse_metrics( TFM_Parser parser )
{
FT_Memory memory = parser->memory;
TFM_FontInfo fi = parser->FontInfo;
FT_Stream stream = parser->stream;
FT_Error error = FT_ERR( Syntax_Error );
FT_ULong lf, lh, nc, nci;
FT_ULong offset_char_info, offset_param;
FT_ULong nw, nh, nd, ni, nl, nk, ne, np, bc, ec;
FT_Long *w, *h, *d;
FT_ULong *ci, v;
FT_ULong i;
FT_Long bbxw, bbxh, xoff, yoff;
if ( !fi )
return FT_THROW( Invalid_Argument );
fi->width = NULL;
fi->height = NULL;
fi->depth = NULL;
ci = NULL;
w = NULL;
h = NULL;
d = NULL;
fi->font_bbx_w = 0.0;
fi->font_bbx_h = 0.0;
fi->font_bbx_xoff = 0.0;
fi->font_bbx_yoff = 0.0;
if( FT_STREAM_SEEK( 0 ) )
return error;
/* Checking the correctness of the TFM file */
if( READ_UINT1( stream ) > 127 )
{
FT_ERROR(( "Malformed TFM file: The first byte of the input file exceeds 127!\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if( FT_STREAM_SEEK( 0 ) )
return error;
lf = READ_UINT2( stream );
lh = READ_UINT2( stream );
bc = READ_UINT2( stream );
ec = READ_UINT2( stream );
nw = READ_UINT2( stream );
nh = READ_UINT2( stream );
nd = READ_UINT2( stream );
ni = READ_UINT2( stream );
nl = READ_UINT2( stream );
nk = READ_UINT2( stream );
ne = READ_UINT2( stream );
np = READ_UINT2( stream );
/* Uncomment this to check for the tfm file's header info if this program returns malformed tfm file */
/*
FT_TRACE6(( "tfm_parse_metrics: First 24 bytes in the tfm file:\n"
" lf : %ld\n"
" lh : %ld\n"
" bc : %d\n"
" ec : %d\n"
" nw : %d\n"
" nh : %d\n"
" nd : %d\n"
" ni : %d\n"
" nl : %d\n"
" nk : %d\n"
" ne : %d\n"
" np : %d\n", lf, lh, bc, ec, nw, nh, nd, ni, nl, nk, ne, np ));
*/
if( lf == 0 || ((4*lf) - 1) > tfm_size)
{
FT_ERROR(( "Malformed TFM file: The file claims to have length zero, but that's impossible!\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if(lh < 2)
{
FT_ERROR(( "Malformed TFM file: The header length is only %ld\n",lh ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if( nl > lig_size )
{
FT_ERROR(( "Malformed TFM file: The lig/kern program is longer than I can handle!\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if( ne > 256 )
{
FT_ERROR(( "Malformed TFM file: There are %ld extensible recipes!\n",ne ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if ( ((signed)(fi->begin_char-1) > (signed)fi->end_char) ||
( fi->end_char > 255) ||
( ne > 256 ) )
{
FT_ERROR(( "tfm_parse_metrics: Incorrect header information in `tfm' file.\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if ( lf != 6 + lh + (ec - bc + 1) + nw + nh + nd + ni + nl + nk + ne + np )
{
FT_ERROR(( "tfm_parse_metrics: Incorrect header information in `tfm' file.\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
fi->begin_char = bc;
fi->end_char = ec;
fi->cs = READ_INT4( stream ); /* Check Sum */
fi->ds = READ_INT4( stream ); /* Design Size */
fi->design_size = (FT_ULong)((double)(fi->ds)/(double)(1<<20));
if( fi->cs <= 0 )
{
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
nc = fi->end_char - fi->begin_char + 1;
nci = nc;
ci = (FT_ULong*)calloc(nci, sizeof(FT_ULong));
w = (FT_Long*)calloc(nw, sizeof(FT_ULong));
h = (FT_Long*)calloc(nh, sizeof(FT_ULong));
d = (FT_Long*)calloc(nd, sizeof(FT_ULong));
if ((ci == NULL) || (w == NULL) || (h == NULL) || (d == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
offset_char_info = 4*(6+lh);
if( FT_STREAM_SEEK( offset_char_info ) ) /* Skip over coding scheme and font family name */
goto Exit;
for (i = 0; i < nci; i++)
ci[i] = READ_UINT4( stream );
offset_param = stream->pos + 4*(nw + nh + nd + ni + nl + nk + ne);
for (i = 0; i < nw; i++)
w[i] = READ_INT4( stream );
for (i = 0; i < nh; i++)
h[i] = READ_INT4( stream );
for (i = 0; i < nd; i++)
d[i] = READ_INT4( stream );
fi->width = (FT_Long*)calloc(nc, sizeof(FT_Long));
fi->height = (FT_Long*)calloc(nc, sizeof(FT_Long));
fi->depth = (FT_Long*)calloc(nc, sizeof(FT_Long));
if ((fi->width == NULL) || (fi->height == NULL) || (fi->depth == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
bbxw = 0;
bbxh = 0;
xoff = 0;
yoff = 0;
for (i = 0; i < nc; i++)
{
v = ci[i] / 0x10000L;
fi->depth[i] = d[v & 0xf]; v >>= 4;
fi->height[i] = h[v & 0xf]; v >>= 4;
fi->width[i] = w[v & 0xff];
if (bbxw < fi->width[i])
bbxw = fi->width[i];
if (bbxh < (fi->height[i] + fi->depth[i]))
bbxh = fi->height[i] + fi->depth[i];
if (yoff > -fi->depth[i])
yoff = -fi->depth[i];
}
fi->font_bbx_w = (FT_ULong)(fi->design_size * ((double)bbxw / (double)(1<<20)));
fi->font_bbx_h = (FT_ULong)(fi->design_size * ((FT_ULong)bbxh / (double)(1<<20)));
fi->font_bbx_xoff = (FT_ULong)(fi->design_size * ((double)xoff / (double)(1<<20)));
fi->font_bbx_yoff = (FT_ULong)(fi->design_size * ((double)yoff / (double)(1<<20)));
if( FT_STREAM_SEEK( offset_param ) )
return error;
if (FT_READ_ULONG(fi->slant) )
return error;
fi->slant = (FT_ULong)((double)fi->slant/(double)(1<<20));
Exit:
FT_FREE(ci);
FT_FREE(w);
FT_FREE(h);
FT_FREE(d);
return error;
}
/* END */