1 /***************************************************************************/
2 /* */
3 /* t1parse.c */
4 /* */
5 /* Type 1 parser (body). */
6 /* */
7 /* Copyright 1996-2018 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 /*************************************************************************/
20 /* */
21 /* The Type 1 parser is in charge of the following: */
22 /* */
23 /* - provide an implementation of a growing sequence of objects called */
24 /* a `T1_Table' (used to build various tables needed by the loader). */
25 /* */
26 /* - opening .pfb and .pfa files to extract their top-level and private */
27 /* dictionaries. */
28 /* */
29 /* - read numbers, arrays & strings from any dictionary. */
30 /* */
31 /* See `t1load.c' to see how data is loaded from the font file. */
32 /* */
33 /*************************************************************************/
34
35
36 #include <ft2build.h>
37 #include FT_INTERNAL_DEBUG_H
38 #include FT_INTERNAL_STREAM_H
39 #include FT_INTERNAL_POSTSCRIPT_AUX_H
40
41 #include "t1parse.h"
42
43 #include "t1errors.h"
44
45
46 /*************************************************************************/
47 /* */
48 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
49 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
50 /* messages during execution. */
51 /* */
52 #undef FT_COMPONENT
53 #define FT_COMPONENT trace_t1parse
54
55
56 /*************************************************************************/
57 /*************************************************************************/
58 /*************************************************************************/
59 /***** *****/
60 /***** INPUT STREAM PARSER *****/
61 /***** *****/
62 /*************************************************************************/
63 /*************************************************************************/
64 /*************************************************************************/
65
66
67 /* see Adobe Technical Note 5040.Download_Fonts.pdf */
68
69 static FT_Error
70 read_pfb_tag( FT_Stream stream,
71 FT_UShort *atag,
72 FT_ULong *asize )
73 {
152 parser->private_dict = NULL;
153 parser->in_pfb = 0;
154 parser->in_memory = 0;
155 parser->single_block = 0;
156
157 /* check the header format */
158 error = check_type1_format( stream, "%!PS-AdobeFont", 14 );
159 if ( error )
160 {
161 if ( FT_ERR_NEQ( error, Unknown_File_Format ) )
162 goto Exit;
163
164 error = check_type1_format( stream, "%!FontType", 10 );
165 if ( error )
166 {
167 FT_TRACE2(( " not a Type 1 font\n" ));
168 goto Exit;
169 }
170 }
171
172 /******************************************************************/
173 /* */
174 /* Here a short summary of what is going on: */
175 /* */
176 /* When creating a new Type 1 parser, we try to locate and load */
177 /* the base dictionary if this is possible (i.e., for PFB */
178 /* files). Otherwise, we load the whole font into memory. */
179 /* */
180 /* When `loading' the base dictionary, we only setup pointers */
181 /* in the case of a memory-based stream. Otherwise, we */
182 /* allocate and load the base dictionary in it. */
183 /* */
184 /* parser->in_pfb is set if we are in a binary (`.pfb') font. */
185 /* parser->in_memory is set if we have a memory stream. */
186 /* */
187
188 /* try to compute the size of the base dictionary; */
189 /* look for a Postscript binary file tag, i.e., 0x8001 */
190 if ( FT_STREAM_SEEK( 0L ) )
191 goto Exit;
192
193 error = read_pfb_tag( stream, &tag, &size );
194 if ( error )
195 goto Exit;
196
197 if ( tag != 0x8001U )
198 {
199 /* assume that this is a PFA file for now; an error will */
200 /* be produced later when more things are checked */
201 if ( FT_STREAM_SEEK( 0L ) )
202 goto Exit;
203 size = stream->size;
204 }
205 else
206 parser->in_pfb = 1;
|
1 /****************************************************************************
2 *
3 * t1parse.c
4 *
5 * Type 1 parser (body).
6 *
7 * Copyright (C) 1996-2019 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18
19 /**************************************************************************
20 *
21 * The Type 1 parser is in charge of the following:
22 *
23 * - provide an implementation of a growing sequence of objects called
24 * a `T1_Table' (used to build various tables needed by the loader).
25 *
26 * - opening .pfb and .pfa files to extract their top-level and private
27 * dictionaries.
28 *
29 * - read numbers, arrays & strings from any dictionary.
30 *
31 * See `t1load.c' to see how data is loaded from the font file.
32 *
33 */
34
35
36 #include <ft2build.h>
37 #include FT_INTERNAL_DEBUG_H
38 #include FT_INTERNAL_STREAM_H
39 #include FT_INTERNAL_POSTSCRIPT_AUX_H
40
41 #include "t1parse.h"
42
43 #include "t1errors.h"
44
45
46 /**************************************************************************
47 *
48 * The macro FT_COMPONENT is used in trace mode. It is an implicit
49 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
50 * messages during execution.
51 */
52 #undef FT_COMPONENT
53 #define FT_COMPONENT t1parse
54
55
56 /*************************************************************************/
57 /*************************************************************************/
58 /*************************************************************************/
59 /***** *****/
60 /***** INPUT STREAM PARSER *****/
61 /***** *****/
62 /*************************************************************************/
63 /*************************************************************************/
64 /*************************************************************************/
65
66
67 /* see Adobe Technical Note 5040.Download_Fonts.pdf */
68
69 static FT_Error
70 read_pfb_tag( FT_Stream stream,
71 FT_UShort *atag,
72 FT_ULong *asize )
73 {
152 parser->private_dict = NULL;
153 parser->in_pfb = 0;
154 parser->in_memory = 0;
155 parser->single_block = 0;
156
157 /* check the header format */
158 error = check_type1_format( stream, "%!PS-AdobeFont", 14 );
159 if ( error )
160 {
161 if ( FT_ERR_NEQ( error, Unknown_File_Format ) )
162 goto Exit;
163
164 error = check_type1_format( stream, "%!FontType", 10 );
165 if ( error )
166 {
167 FT_TRACE2(( " not a Type 1 font\n" ));
168 goto Exit;
169 }
170 }
171
172 /*******************************************************************
173 *
174 * Here a short summary of what is going on:
175 *
176 * When creating a new Type 1 parser, we try to locate and load
177 * the base dictionary if this is possible (i.e., for PFB
178 * files). Otherwise, we load the whole font into memory.
179 *
180 * When `loading' the base dictionary, we only setup pointers
181 * in the case of a memory-based stream. Otherwise, we
182 * allocate and load the base dictionary in it.
183 *
184 * parser->in_pfb is set if we are in a binary (`.pfb') font.
185 * parser->in_memory is set if we have a memory stream.
186 */
187
188 /* try to compute the size of the base dictionary; */
189 /* look for a Postscript binary file tag, i.e., 0x8001 */
190 if ( FT_STREAM_SEEK( 0L ) )
191 goto Exit;
192
193 error = read_pfb_tag( stream, &tag, &size );
194 if ( error )
195 goto Exit;
196
197 if ( tag != 0x8001U )
198 {
199 /* assume that this is a PFA file for now; an error will */
200 /* be produced later when more things are checked */
201 if ( FT_STREAM_SEEK( 0L ) )
202 goto Exit;
203 size = stream->size;
204 }
205 else
206 parser->in_pfb = 1;
|