ref: 665ac967925618b43b3c87d96eebbd9015dafe4e
dir: /src/cid/cidload.c/
/****************************************************************************
*
* cidload.c
*
* CID-keyed Type1 font loader (body).
*
* Copyright (C) 1996-2020 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 <freetype/internal/ftdebug.h>
#include FT_CONFIG_CONFIG_H
#include <freetype/ftmm.h>
#include <freetype/internal/t1types.h>
#include <freetype/internal/psaux.h>
#include "cidload.h"
#include "ciderrs.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 cidload
/* read a single offset */
FT_LOCAL_DEF( FT_ULong )
cid_get_offset( FT_Byte* *start,
FT_Byte offsize )
{
FT_ULong result;
FT_Byte* p = *start;
for ( result = 0; offsize > 0; offsize-- )
{
result <<= 8;
result |= *p++;
}
*start = p;
return result;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** TYPE 1 SYMBOL PARSING *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static FT_Error
cid_load_keyword( CID_Face face,
CID_Loader* loader,
const T1_Field keyword )
{
FT_Error error;
CID_Parser* parser = &loader->parser;
FT_Byte* object;
void* dummy_object;
CID_FaceInfo cid = &face->cid;
/* if the keyword has a dedicated callback, call it */
if ( keyword->type == T1_FIELD_TYPE_CALLBACK )
{
FT_TRACE4(( " %s", keyword->ident ));
keyword->reader( (FT_Face)face, parser );
error = parser->root.error;
goto Exit;
}
/* we must now compute the address of our target object */
switch ( keyword->location )
{
case T1_FIELD_LOCATION_CID_INFO:
object = (FT_Byte*)cid;
break;
case T1_FIELD_LOCATION_FONT_INFO:
object = (FT_Byte*)&cid->font_info;
break;
case T1_FIELD_LOCATION_FONT_EXTRA:
object = (FT_Byte*)&face->font_extra;
break;
case T1_FIELD_LOCATION_BBOX:
object = (FT_Byte*)&cid->font_bbox;
break;
default:
{
CID_FaceDict dict;
if ( parser->num_dict < 0 || parser->num_dict >= cid->num_dicts )
{
FT_ERROR(( "cid_load_keyword: invalid use of `%s'\n",
keyword->ident ));
error = FT_THROW( Syntax_Error );
goto Exit;
}
dict = cid->font_dicts + parser->num_dict;
switch ( keyword->location )
{
case T1_FIELD_LOCATION_PRIVATE:
object = (FT_Byte*)&dict->private_dict;
break;
default:
object = (FT_Byte*)dict;
}
}
}
FT_TRACE4(( " %s", keyword->ident ));
dummy_object = object;
/* now, load the keyword data in the object's field(s) */
if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
keyword->type == T1_FIELD_TYPE_FIXED_ARRAY )
error = cid_parser_load_field_table( &loader->parser, keyword,
&dummy_object );
else
error = cid_parser_load_field( &loader->parser,
keyword, &dummy_object );
FT_TRACE4(( "\n" ));
Exit:
return error;
}
FT_CALLBACK_DEF( void )
cid_parse_font_matrix( CID_Face face,
CID_Parser* parser )
{
CID_FaceDict dict;
FT_Face root = (FT_Face)&face->root;
FT_Fixed temp[6];
FT_Fixed temp_scale;
if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
{
FT_Matrix* matrix;
FT_Vector* offset;
FT_Int result;
dict = face->cid.font_dicts + parser->num_dict;
matrix = &dict->font_matrix;
offset = &dict->font_offset;
/* input is scaled by 1000 to accommodate default FontMatrix */
result = cid_parser_to_fixed_array( parser, 6, temp, 3 );
if ( result < 6 )
{
FT_ERROR(( "cid_parse_font_matrix: not enough matrix elements\n" ));
goto Exit;
}
FT_TRACE4(( " [%f %f %f %f %f %f]\n",
(double)temp[0] / 65536 / 1000,
(double)temp[1] / 65536 / 1000,
(double)temp[2] / 65536 / 1000,
(double)temp[3] / 65536 / 1000,
(double)temp[4] / 65536 / 1000,
(double)temp[5] / 65536 / 1000 ));
temp_scale = FT_ABS( temp[3] );
if ( temp_scale == 0 )
{
FT_ERROR(( "cid_parse_font_matrix: invalid font matrix\n" ));
goto Exit;
}
/* atypical case */
if ( temp_scale != 0x10000L )
{
/* set units per EM based on FontMatrix values */
root->units_per_EM = (FT_UShort)FT_DivFix( 1000, temp_scale );
temp[0] = FT_DivFix( temp[0], temp_scale );
temp[1] = FT_DivFix( temp[1], temp_scale );
temp[2] = FT_DivFix( temp[2], temp_scale );
temp[4] = FT_DivFix( temp[4], temp_scale );
temp[5] = FT_DivFix( temp[5], temp_scale );
temp[3] = temp[3] < 0 ? -0x10000L : 0x10000L;
}
matrix->xx = temp[0];
matrix->yx = temp[1];
matrix->xy = temp[2];
matrix->yy = temp[3];
if ( !FT_Matrix_Check( matrix ) )
{
FT_ERROR(( "t1_parse_font_matrix: invalid font matrix\n" ));
parser->root.error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* note that the font offsets are expressed in integer font units */
offset->x = temp[4] >> 16;
offset->y = temp[5] >> 16;
}
Exit:
return;
}
FT_CALLBACK_DEF( void )
parse_fd_array( CID_Face face,
CID_Parser* parser )
{
CID_FaceInfo cid = &face->cid;
FT_Memory memory = face->root.memory;
FT_Stream stream = parser->stream;
FT_Error error = FT_Err_Ok;
FT_Long num_dicts;
num_dicts = cid_parser_to_int( parser );
if ( num_dicts < 0 )
{
FT_ERROR(( "parse_fd_array: invalid number of dictionaries\n" ));
goto Exit;
}
FT_TRACE4(( " %ld\n", num_dicts ));
/*
* A single entry in the FDArray must (at least) contain the following
* structure elements.
*
* %ADOBeginFontDict 18
* X dict begin 13
* /FontMatrix [X X X X] 22
* /Private X dict begin 22
* end 4
* end 4
* %ADOEndFontDict 16
*
* This needs 18+13+22+22+4+4+16=99 bytes or more. Normally, you also
* need a `dup X' at the very beginning and a `put' at the end, so a
* rough guess using 100 bytes as the minimum is justified.
*/
if ( (FT_ULong)num_dicts > stream->size / 100 )
{
FT_TRACE0(( "parse_fd_array: adjusting FDArray size"
" (from %ld to %ld)\n",
num_dicts,
stream->size / 100 ));
num_dicts = (FT_Long)( stream->size / 100 );
}
if ( !cid->font_dicts )
{
FT_Int n;
if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) )
goto Exit;
cid->num_dicts = num_dicts;
/* set some default values (the same as for Type 1 fonts) */
for ( n = 0; n < cid->num_dicts; n++ )
{
CID_FaceDict dict = cid->font_dicts + n;
dict->private_dict.blue_shift = 7;
dict->private_dict.blue_fuzz = 1;
dict->private_dict.lenIV = 4;
dict->private_dict.expansion_factor = (FT_Fixed)( 0.06 * 0x10000L );
dict->private_dict.blue_scale = (FT_Fixed)(
0.039625 * 0x10000L * 1000 );
}
}
Exit:
return;
}
/* By mistake, `expansion_factor' appears both in PS_PrivateRec */
/* and CID_FaceDictRec (both are public header files and can't */
/* changed). We simply copy the value. */
FT_CALLBACK_DEF( void )
parse_expansion_factor( CID_Face face,
CID_Parser* parser )
{
CID_FaceDict dict;
if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
{
dict = face->cid.font_dicts + parser->num_dict;
dict->expansion_factor = cid_parser_to_fixed( parser, 0 );
dict->private_dict.expansion_factor = dict->expansion_factor;
FT_TRACE4(( "%ld\n", dict->expansion_factor ));
}
return;
}
/* By mistake, `CID_FaceDictRec' doesn't contain a field for the */
/* `FontName' keyword. FreeType doesn't need it, but it is nice */
/* to catch it for producing better trace output. */
FT_CALLBACK_DEF( void )
parse_font_name( CID_Face face,
CID_Parser* parser )
{
#ifdef FT_DEBUG_LEVEL_TRACE
if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts )
{
T1_TokenRec token;
FT_UInt len;
cid_parser_to_token( parser, &token );
len = (FT_UInt)( token.limit - token.start );
if ( len )
FT_TRACE4(( " %.*s\n", len, token.start ));
else
FT_TRACE4(( " <no value>\n" ));
}
#else
FT_UNUSED( face );
FT_UNUSED( parser );
#endif
return;
}
static
const T1_FieldRec cid_field_records[] =
{
#include "cidtoken.h"
T1_FIELD_CALLBACK( "FDArray", parse_fd_array, 0 )
T1_FIELD_CALLBACK( "FontMatrix", cid_parse_font_matrix, 0 )
T1_FIELD_CALLBACK( "ExpansionFactor", parse_expansion_factor, 0 )
T1_FIELD_CALLBACK( "FontName", parse_font_name, 0 )
{ 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 }
};
static FT_Error
cid_parse_dict( CID_Face face,
CID_Loader* loader,
FT_Byte* base,
FT_ULong size )
{
CID_Parser* parser = &loader->parser;
parser->root.cursor = base;
parser->root.limit = base + size;
parser->root.error = FT_Err_Ok;
{
FT_Byte* cur = base;
FT_Byte* limit = cur + size;
for (;;)
{
FT_Byte* newlimit;
parser->root.cursor = cur;
cid_parser_skip_spaces( parser );
if ( parser->root.cursor >= limit )
newlimit = limit - 1 - 17;
else
newlimit = parser->root.cursor - 17;
/* look for `%ADOBeginFontDict' */
for ( ; cur < newlimit; cur++ )
{
if ( *cur == '%' &&
ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
{
/* if /FDArray was found, then cid->num_dicts is > 0, and */
/* we can start increasing parser->num_dict */
if ( face->cid.num_dicts > 0 )
{
parser->num_dict++;
#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE4(( " FontDict %d", parser->num_dict ));
if ( parser->num_dict > face->cid.num_dicts )
FT_TRACE4(( " (ignored)" ));
FT_TRACE4(( "\n" ));
#endif
}
}
}
cur = parser->root.cursor;
/* no error can occur in cid_parser_skip_spaces */
if ( cur >= limit )
break;
cid_parser_skip_PS_token( parser );
if ( parser->root.cursor >= limit || parser->root.error )
break;
/* look for immediates */
if ( *cur == '/' && cur + 2 < limit )
{
FT_UInt len;
cur++;
len = (FT_UInt)( parser->root.cursor - cur );
if ( len > 0 && len < 22 )
{
/* now compare the immediate name to the keyword table */
T1_Field keyword = (T1_Field)cid_field_records;
for (;;)
{
FT_Byte* name;
name = (FT_Byte*)keyword->ident;
if ( !name )
break;
if ( cur[0] == name[0] &&
len == ft_strlen( (const char*)name ) )
{
FT_UInt n;
for ( n = 1; n < len; n++ )
if ( cur[n] != name[n] )
break;
if ( n >= len )
{
/* we found it - run the parsing callback */
parser->root.error = cid_load_keyword( face,
loader,
keyword );
if ( parser->root.error )
return parser->root.error;
break;
}
}
keyword++;
}
}
}
cur = parser->root.cursor;
}
if ( !face->cid.num_dicts )
{
FT_ERROR(( "cid_parse_dict: No font dictionary found\n" ));
return FT_THROW( Invalid_File_Format );
}
}
return parser->root.error;
}
/* read the subrmap and the subrs of each font dict */
static FT_Error
cid_read_subrs( CID_Face face )
{
CID_FaceInfo cid = &face->cid;
FT_Memory memory = face->root.memory;
FT_Stream stream = face->cid_stream;
FT_Error error;
FT_Int n;
CID_Subrs subr;
FT_UInt max_offsets = 0;
FT_ULong* offsets = NULL;
PSAux_Service psaux = (PSAux_Service)face->psaux;
if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) )
goto Exit;
subr = face->subrs;
for ( n = 0; n < cid->num_dicts; n++, subr++ )
{
CID_FaceDict dict = cid->font_dicts + n;
FT_Int lenIV = dict->private_dict.lenIV;
FT_UInt count, num_subrs = dict->num_subrs;
FT_ULong data_len;
FT_Byte* p;
if ( !num_subrs )
continue;
/* reallocate offsets array if needed */
if ( num_subrs + 1 > max_offsets )
{
FT_UInt new_max = FT_PAD_CEIL( num_subrs + 1, 4 );
if ( new_max <= max_offsets )
{
error = FT_THROW( Syntax_Error );
goto Fail;
}
if ( FT_RENEW_ARRAY( offsets, max_offsets, new_max ) )
goto Fail;
max_offsets = new_max;
}
/* read the subrmap's offsets */
if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset ) ||
FT_FRAME_ENTER( ( num_subrs + 1 ) * (FT_UInt)dict->sd_bytes ) )
goto Fail;
p = (FT_Byte*)stream->cursor;
for ( count = 0; count <= num_subrs; count++ )
offsets[count] = cid_get_offset( &p, (FT_Byte)dict->sd_bytes );
FT_FRAME_EXIT();
/* offsets must be ordered */
for ( count = 1; count <= num_subrs; count++ )
if ( offsets[count - 1] > offsets[count] )
{
FT_ERROR(( "cid_read_subrs: offsets are not ordered\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
if ( offsets[num_subrs] > stream->size - cid->data_offset )
{
FT_ERROR(( "cid_read_subrs: too large `subrs' offsets\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
/* now, compute the size of subrs charstrings, */
/* allocate, and read them */
data_len = offsets[num_subrs] - offsets[0];
if ( FT_NEW_ARRAY( subr->code, num_subrs + 1 ) ||
FT_ALLOC( subr->code[0], data_len ) )
goto Fail;
if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) ||
FT_STREAM_READ( subr->code[0], data_len ) )
goto Fail;
/* set up pointers */
for ( count = 1; count <= num_subrs; count++ )
{
FT_ULong len;
len = offsets[count] - offsets[count - 1];
subr->code[count] = subr->code[count - 1] + len;
}
/* decrypt subroutines, but only if lenIV >= 0 */
if ( lenIV >= 0 )
{
for ( count = 0; count < num_subrs; count++ )
{
FT_ULong len;
len = offsets[count + 1] - offsets[count];
psaux->t1_decrypt( subr->code[count], len, 4330 );
}
}
subr->num_subrs = (FT_Int)num_subrs;
}
Exit:
FT_FREE( offsets );
return error;
Fail:
if ( face->subrs )
{
for ( n = 0; n < cid->num_dicts; n++ )
{
if ( face->subrs[n].code )
FT_FREE( face->subrs[n].code[0] );
FT_FREE( face->subrs[n].code );
}
FT_FREE( face->subrs );
}
goto Exit;
}
static void
cid_init_loader( CID_Loader* loader,
CID_Face face )
{
FT_UNUSED( face );
FT_ZERO( loader );
}
static void
cid_done_loader( CID_Loader* loader )
{
CID_Parser* parser = &loader->parser;
/* finalize parser */
cid_parser_done( parser );
}
static FT_Error
cid_hex_to_binary( FT_Byte* data,
FT_ULong data_len,
FT_ULong offset,
CID_Face face )
{
FT_Stream stream = face->root.stream;
FT_Error error;
FT_Byte buffer[256];
FT_Byte *p, *plimit;
FT_Byte *d, *dlimit;
FT_Byte val;
FT_Bool upper_nibble, done;
if ( FT_STREAM_SEEK( offset ) )
goto Exit;
d = data;
dlimit = d + data_len;
p = buffer;
plimit = p;
upper_nibble = 1;
done = 0;
while ( d < dlimit )
{
if ( p >= plimit )
{
FT_ULong oldpos = FT_STREAM_POS();
FT_ULong size = stream->size - oldpos;
if ( size == 0 )
{
error = FT_THROW( Syntax_Error );
goto Exit;
}
if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) )
goto Exit;
p = buffer;
plimit = p + FT_STREAM_POS() - oldpos;
}
if ( ft_isdigit( *p ) )
val = (FT_Byte)( *p - '0' );
else if ( *p >= 'a' && *p <= 'f' )
val = (FT_Byte)( *p - 'a' + 10 );
else if ( *p >= 'A' && *p <= 'F' )
val = (FT_Byte)( *p - 'A' + 10 );
else if ( *p == ' ' ||
*p == '\t' ||
*p == '\r' ||
*p == '\n' ||
*p == '\f' ||
*p == '\0' )
{
p++;
continue;
}
else if ( *p == '>' )
{
val = 0;
done = 1;
}
else
{
error = FT_THROW( Syntax_Error );
goto Exit;
}
if ( upper_nibble )
*d = (FT_Byte)( val << 4 );
else
{
*d = (FT_Byte)( *d + val );
d++;
}
upper_nibble = (FT_Byte)( 1 - upper_nibble );
if ( done )
break;
p++;
}
error = FT_Err_Ok;
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
cid_face_open( CID_Face face,
FT_Int face_index )
{
CID_Loader loader;
CID_Parser* parser;
FT_Memory memory = face->root.memory;
FT_Error error;
FT_Int n;
CID_FaceInfo cid = &face->cid;
FT_ULong binary_length;
FT_ULong entry_len;
cid_init_loader( &loader, face );
parser = &loader.parser;
error = cid_parser_new( parser, face->root.stream, face->root.memory,
(PSAux_Service)face->psaux );
if ( error )
goto Exit;
error = cid_parse_dict( face, &loader,
parser->postscript,
parser->postscript_len );
if ( error )
goto Exit;
if ( face_index < 0 )
goto Exit;
if ( FT_NEW( face->cid_stream ) )
goto Exit;
if ( parser->binary_length )
{
if ( parser->binary_length >
face->root.stream->size - parser->data_offset )
{
FT_TRACE0(( "cid_face_open: adjusting length of binary data\n" ));
FT_TRACE0(( " (from %ld to %ld bytes)\n",
parser->binary_length,
face->root.stream->size - parser->data_offset ));
parser->binary_length = face->root.stream->size -
parser->data_offset;
}
/* we must convert the data section from hexadecimal to binary */
if ( FT_ALLOC( face->binary_data, parser->binary_length ) ||
FT_SET_ERROR( cid_hex_to_binary( face->binary_data,
parser->binary_length,
parser->data_offset,
face ) ) )
goto Exit;
FT_Stream_OpenMemory( face->cid_stream,
face->binary_data, parser->binary_length );
cid->data_offset = 0;
}
else
{
*face->cid_stream = *face->root.stream;
cid->data_offset = loader.parser.data_offset;
}
/* sanity tests */
if ( cid->fd_bytes < 0 || cid->gd_bytes < 1 )
{
FT_ERROR(( "cid_face_open:"
" Invalid `FDBytes' or `GDBytes' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* allow at most 32bit offsets */
if ( cid->fd_bytes > 4 || cid->gd_bytes > 4 )
{
FT_ERROR(( "cid_face_open:"
" Values of `FDBytes' or `GDBytes' larger than 4\n"
" "
" are not supported\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
binary_length = face->cid_stream->size - cid->data_offset;
entry_len = (FT_ULong)( cid->fd_bytes + cid->gd_bytes );
for ( n = 0; n < cid->num_dicts; n++ )
{
CID_FaceDict dict = cid->font_dicts + n;
/* the upper limits are ad-hoc values */
if ( dict->private_dict.blue_shift > 1000 ||
dict->private_dict.blue_shift < 0 )
{
FT_TRACE2(( "cid_face_open:"
" setting unlikely BlueShift value %d to default (7)\n",
dict->private_dict.blue_shift ));
dict->private_dict.blue_shift = 7;
}
if ( dict->private_dict.blue_fuzz > 1000 ||
dict->private_dict.blue_fuzz < 0 )
{
FT_TRACE2(( "cid_face_open:"
" setting unlikely BlueFuzz value %d to default (1)\n",
dict->private_dict.blue_fuzz ));
dict->private_dict.blue_fuzz = 1;
}
if ( dict->sd_bytes < 0 ||
( dict->num_subrs && dict->sd_bytes < 1 ) )
{
FT_ERROR(( "cid_face_open: Invalid `SDBytes' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( dict->sd_bytes > 4 )
{
FT_ERROR(( "cid_face_open:"
" Values of `SDBytes' larger than 4"
" are not supported\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( dict->subrmap_offset > binary_length )
{
FT_ERROR(( "cid_face_open: Invalid `SubrMapOffset' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* `num_subrs' is scanned as a signed integer */
if ( (FT_Int)dict->num_subrs < 0 ||
( dict->sd_bytes &&
dict->num_subrs > ( binary_length - dict->subrmap_offset ) /
(FT_UInt)dict->sd_bytes ) )
{
FT_ERROR(( "cid_face_open: Invalid `SubrCount' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
if ( cid->cidmap_offset > binary_length )
{
FT_ERROR(( "cid_face_open: Invalid `CIDMapOffset' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( entry_len &&
cid->cid_count >
( binary_length - cid->cidmap_offset ) / entry_len )
{
FT_ERROR(( "cid_face_open: Invalid `CIDCount' value\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* we can now safely proceed */
error = cid_read_subrs( face );
Exit:
cid_done_loader( &loader );
return error;
}
/* END */