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[tfm] Modify module functions as per `tftopl'.

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* src/tfm/tfmobjs.c(tfm_parse_metrics):
  - Modify the metric extraction functions.
  - Add checking for `tfm' file so that an error will be
    returned if the font file is found *malformed*.
GSoC-2018-parth
Parth Wazurkar 6 years ago
parent 903a066214
commit b583b42c85
1 changed files with 101 additions and 154 deletions
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  1. 255
      src/tfm/tfmobjs.c

255
src/tfm/tfmobjs.c
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@ -39,8 +39,16 @@
#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.
*
@ -49,8 +57,9 @@
long tfm_read_intn(FT_Stream,int);
unsigned long tfm_read_uintn(FT_Stream,int);
#define READ_UINT2( stream ) (FT_Byte)tfm_read_uintn( stream, 2)
#define READ_UINT4( stream ) (FT_Byte)tfm_read_uintn( stream, 4)
#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)
/*
@ -66,7 +75,7 @@
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
return 0;
k =(unsigned long)tp;
v = v*256L + k;
--size;
@ -82,7 +91,7 @@
FT_Error error= FT_Err_Ok;
unsigned long z ;
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
return 0;
z= (unsigned long)tp;
v = (long)z & 0xffL;
if (v & 0x80L)
@ -91,7 +100,7 @@
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
return 0;
z= (unsigned long)tp;
v = v*256L + z;
--size;
@ -137,8 +146,8 @@
FT_Error error = FT_ERR( Syntax_Error );
FT_ULong lf, lh, nc, nci;
FT_ULong offset_header, offset_char_info, offset_param;
FT_ULong nw, nh, nd, ni, nl, nk, neng, np;
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;
@ -162,121 +171,110 @@
fi->font_bbx_xoff = 0.0;
fi->font_bbx_yoff = 0.0;
/* rewind(fp); */
if( FT_STREAM_SEEK( 0 ) )
return error;
lf = (FT_ULong)READ_UINT2( stream );
fi->fs = 4*lf - 1 ;
/* 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;
#if 0
if ((lf == 11) || (lf == 9))
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)
{
/* JFM file of Japanese TeX by ASCII Coop. */
tfm->type = METRIC_TYPE_JFM;
tfm->type_aux = (lf == 11)?METRIC_TYPE_JFM_AUX_H:METRIC_TYPE_JFM_AUX_V;
tfm->nt = (FT_ULong)READ_UINT2(fp);
lf = (FT_ULong)READ_UINT2(fp);
lh = (FT_ULong)READ_UINT2(fp);
offset_header = 4*7;
offset_char_info = 4*(7+tfm->nt+lh);
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;
}
else if (lf == 0)
if(lh < 2)
{
/* Omega Metric File */
tfm->type = METRIC_TYPE_OFM;
tfm->type_aux = READ_INT2(fp); /* ofm_level */
if ((tfm->type_aux < 0) || (1 < tfm->type_aux))
tfm->type_aux = 0; /* broken, maybe */
lf = READ_UINT4(fp);
lh = READ_UINT4(fp);
if (tfm->type_aux == 0)
{ /* level 0 OFM */
offset_header = 4*14;
offset_char_info = 4*(14+lh);
}
else
{ /* level 1 OFM: *** NOT SUPPORTED YET *** */
offset_header = 4*29;
offset_char_info = 4*(29+lh);
}
FT_ERROR(( "Malformed TFM file: The header length is only %ld\n",lh ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
else
{ }
#endif
/* Traditional TeX Metric File */
lh = (int)READ_UINT2( stream );
offset_header = 4*6;
offset_char_info = 4*(6+lh);
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 0
if (tfm->type == METRIC_TYPE_OFM)
if( ne > 256 )
{
tfm->begin_char = READ_UINT4(fp);
tfm->end_char = READ_UINT4(fp);
nw = READ_UINT4(fp);
nh = READ_UINT4(fp);
nd = READ_UINT4(fp);
ni = READ_UINT4(fp);
nl = READ_UINT4(fp);
nk = READ_UINT4(fp);
neng = READ_UINT4(fp);
np = READ_UINT4(fp);
dir = READ_UINT4(fp);
if (((signed)(tfm->begin_char-1) > (signed)tfm->end_char) ||
(tfm->end_char > 65535))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_ERROR(( "Malformed TFM file: There are %ld extensible recipes!\n",ne ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
else
{ }
#endif
fi->begin_char = (int)READ_UINT2( stream );
fi->end_char = (int)READ_UINT2( stream );
nw = (FT_ULong)READ_UINT2( stream );
nh = (FT_ULong)READ_UINT2( stream );
nd = (FT_ULong)READ_UINT2( stream );
ni = (FT_ULong)READ_UINT2( stream );
nl = (FT_ULong)READ_UINT2( stream );
nk = (FT_ULong)READ_UINT2( stream );
neng = (FT_ULong)READ_UINT2( stream );
np = (FT_ULong)READ_UINT2( stream );
#if 0
if (tfm->type == METRIC_TYPE_TFM)
{}
#endif
if (((signed)(fi->begin_char-1) > (signed)fi->end_char) ||
(fi->end_char > 255))
if ( ((signed)(fi->begin_char-1) > (signed)fi->end_char) ||
( fi->end_char > 255) ||
( ne > 256 ) )
{
error = FT_THROW( Invalid_Argument );
FT_ERROR(( "tfm_parse_metrics: Incorrect header information in `tfm' file.\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* fseek(fp, offset_header, SEEK_SET); */
if (FT_STREAM_SEEK( offset_header ) )
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->cs = READ_UINT4( stream ); /* Check Sum */
fi->ds = READ_UINT4( stream ); /* Design Size */
}
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));
printf("fi->cs is %ld\n",fi->cs);
if( fi->cs <= 0 )
{
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
nc = fi->end_char - fi->begin_char + 1;
nci = nc;
#if 0
if (tfm->type == METRIC_TYPE_OFM)
nci *= 2;
#endif
ci = (FT_ULong*)calloc(nci, sizeof(FT_ULong));
w = (FT_Long*)calloc(nw, sizeof(FT_ULong));
h = (FT_Long*)calloc(nh, sizeof(FT_ULong));
@ -288,15 +286,14 @@
goto Exit;
}
/* fseek(fp, offset_char_info, SEEK_SET); */
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 = ftell(fp) + 4*(nw + nh + nd + ni + nl + nk + neng); */
offset_param = stream->pos + 4*(nw + nh + nd + ni + nl + nk + neng);
offset_param = stream->pos + 4*(nw + nh + nd + ni + nl + nk + ne);
for (i = 0; i < nw; i++)
w[i] = READ_INT4( stream );
@ -320,33 +317,6 @@
xoff = 0;
yoff = 0;
#if 0
if (tfm->type == METRIC_TYPE_OFM)
{
for (i = 0; i < nc; i++)
{
v = ci[2*i];
tfm->depth[i] = d[v & 0xff]; v >>= 8;
tfm->height[i] = h[v & 0xff]; v >>= 8;
tfm->width[i] = w[v & 0xffff];
if (bbxw < tfm->width[i])
bbxw = tfm->width[i];
if (bbxh < (tfm->height[i] + tfm->depth[i]))
bbxh = tfm->height[i] + tfm->depth[i];
if (yoff > -tfm->depth[i])
yoff = -tfm->depth[i];
#if 0
printf("** %.3f %.3f %.3f\n",
(double)tfm->width[i]/(double)(1<<20),
(double)tfm->height[i]/(double)(1<<20),
(double)tfm->depth[i]/(double)(1<<20));
#endif
}
}
else
{ }
#endif
for (i = 0; i < nc; i++)
{
v = ci[i] / 0x10000L;
@ -369,31 +339,8 @@
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 0
if (tfm->type == METRIC_TYPE_JFM)
{
fseek(fp, 4*(7+lh), SEEK_SET);
tfm->ct_kcode = (unsigned int*)calloc(tfm->nt+1, sizeof(unsigned int));
tfm->ct_ctype = (unsigned int*)calloc(tfm->nt+1, sizeof(unsigned int));
if ((tfm->ct_kcode == NULL) || (tfm->ct_ctype == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
for (i = 0; i < tfm->nt; i++)
{
v = READ_UINT4(fp);
tfm->ct_kcode[i] = v/0x10000L;
tfm->ct_ctype[i] = v%0x10000L;
}
tfm->ct_kcode[tfm->nt] = 0; /* sentinel */
tfm->ct_ctype[tfm->nt] = 0;
}
#endif
/* fseek(fp, offset_param, SEEK_SET); */
if( FT_STREAM_SEEK( offset_param ) )
return error; /* To be changed */
return error;
if (FT_READ_ULONG(fi->slant) )
return error;
fi->slant = (FT_ULong)((double)fi->slant/(double)(1<<20));

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