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+/***************************************************************************/
+/* */
+/* t1parse.c */
+/* */
+/* Type 1 parser (body). */
+/* */
+/* Copyright 1996-2001, 2002 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. */
+/* */
+/***************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* The Type 1 parser is in charge of the following: */
+ /* */
+ /* - provide an implementation of a growing sequence of objects called */
+ /* a `T1_Table' (used to build various tables needed by the loader). */
+ /* */
+ /* - opening .pfb and .pfa files to extract their top-level and private */
+ /* dictionaries. */
+ /* */
+ /* - read numbers, arrays & strings from any dictionary. */
+ /* */
+ /* See `t1load.c' to see how data is loaded from the font file. */
+ /* */
+ /*************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_CALC_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_POSTSCRIPT_AUX_H
+
+#include "t1parse.h"
+
+#include "t1errors.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_t1parse
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** INPUT STREAM PARSER *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+#define IS_T1_WHITESPACE( c ) ( (c) == ' ' || (c) == '\t' )
+#define IS_T1_LINESPACE( c ) ( (c) == '\r' || (c) == '\n' )
+
+#define IS_T1_SPACE( c ) ( IS_T1_WHITESPACE( c ) || IS_T1_LINESPACE( c ) )
+
+
+ typedef struct PFB_Tag_
+ {
+ FT_UShort tag;
+ FT_Long size;
+
+ } PFB_Tag;
+
+
+#undef FT_STRUCTURE
+#define FT_STRUCTURE PFB_Tag
+
+
+ static
+ const FT_Frame_Field pfb_tag_fields[] =
+ {
+ FT_FRAME_START( 6 ),
+ FT_FRAME_USHORT ( tag ),
+ FT_FRAME_LONG_LE( size ),
+ FT_FRAME_END
+ };
+
+
+ static FT_Error
+ read_pfb_tag( FT_Stream stream,
+ FT_UShort* tag,
+ FT_Long* size )
+ {
+ FT_Error error;
+ PFB_Tag head;
+
+
+ *tag = 0;
+ *size = 0;
+ if ( !FT_STREAM_READ_FIELDS( pfb_tag_fields, &head ) )
+ {
+ if ( head.tag == 0x8001U || head.tag == 0x8002U )
+ {
+ *tag = head.tag;
+ *size = head.size;
+ }
+ }
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ T1_New_Parser( T1_Parser parser,
+ FT_Stream stream,
+ FT_Memory memory,
+ PSAux_Service psaux )
+ {
+ FT_Error error;
+ FT_UShort tag;
+ FT_Long size;
+
+
+ psaux->ps_parser_funcs->init( &parser->root,0, 0, memory );
+
+ parser->stream = stream;
+ parser->base_len = 0;
+ parser->base_dict = 0;
+ parser->private_len = 0;
+ parser->private_dict = 0;
+ parser->in_pfb = 0;
+ parser->in_memory = 0;
+ parser->single_block = 0;
+
+ /******************************************************************/
+ /* */
+ /* Here a short summary of what is going on: */
+ /* */
+ /* When creating a new Type 1 parser, we try to locate and load */
+ /* the base dictionary if this is possible (i.e. for PFB */
+ /* files). Otherwise, we load the whole font into memory. */
+ /* */
+ /* When `loading' the base dictionary, we only setup pointers */
+ /* in the case of a memory-based stream. Otherwise, we */
+ /* allocate and load the base dictionary in it. */
+ /* */
+ /* parser->in_pfb is set if we are in a binary (".pfb") font. */
+ /* parser->in_memory is set if we have a memory stream. */
+ /* */
+
+ /* try to compute the size of the base dictionary; */
+ /* look for a Postscript binary file tag, i.e 0x8001 */
+ if ( FT_STREAM_SEEK( 0L ) )
+ goto Exit;
+
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error )
+ goto Exit;
+
+ if ( tag != 0x8001U )
+ {
+ /* assume that this is a PFA file for now; an error will */
+ /* be produced later when more things are checked */
+ if ( FT_STREAM_SEEK( 0L ) )
+ goto Exit;
+ size = stream->size;
+ }
+ else
+ parser->in_pfb = 1;
+
+ /* now, try to load `size' bytes of the `base' dictionary we */
+ /* found previously */
+
+ /* if it is a memory-based resource, set up pointers */
+ if ( !stream->read )
+ {
+ parser->base_dict = (FT_Byte*)stream->base + stream->pos;
+ parser->base_len = size;
+ parser->in_memory = 1;
+
+ /* check that the `size' field is valid */
+ if ( FT_STREAM_SKIP( size ) )
+ goto Exit;
+ }
+ else
+ {
+ /* read segment in memory */
+ if ( FT_ALLOC( parser->base_dict, size ) ||
+ FT_STREAM_READ( parser->base_dict, size ) )
+ goto Exit;
+ parser->base_len = size;
+ }
+
+ /* Now check font format; we must see `%!PS-AdobeFont-1' */
+ /* or `%!FontType' */
+ {
+ if ( size <= 16 ||
+ ( ft_strncmp( (const char*)parser->base_dict,
+ "%!PS-AdobeFont-1", 16 ) &&
+ ft_strncmp( (const char*)parser->base_dict,
+ "%!FontType", 10 ) ) )
+ {
+ FT_TRACE2(( "[not a Type1 font]\n" ));
+ error = T1_Err_Unknown_File_Format;
+ }
+ else
+ {
+ parser->root.base = parser->base_dict;
+ parser->root.cursor = parser->base_dict;
+ parser->root.limit = parser->root.cursor + parser->base_len;
+ }
+ }
+
+ Exit:
+ if ( error && !parser->in_memory )
+ FT_FREE( parser->base_dict );
+
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ T1_Finalize_Parser( T1_Parser parser )
+ {
+ FT_Memory memory = parser->root.memory;
+
+
+ /* always free the private dictionary */
+ FT_FREE( parser->private_dict );
+
+ /* free the base dictionary only when we have a disk stream */
+ if ( !parser->in_memory )
+ FT_FREE( parser->base_dict );
+
+ parser->root.funcs.done( &parser->root );
+ }
+
+
+ /* return the value of an hexadecimal digit */
+ static int
+ hexa_value( char c )
+ {
+ unsigned int d;
+
+
+ d = (unsigned int)( c - '0' );
+ if ( d <= 9 )
+ return (int)d;
+
+ d = (unsigned int)( c - 'a' );
+ if ( d <= 5 )
+ return (int)( d + 10 );
+
+ d = (unsigned int)( c - 'A' );
+ if ( d <= 5 )
+ return (int)( d + 10 );
+
+ return -1;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ T1_Get_Private_Dict( T1_Parser parser,
+ PSAux_Service psaux )
+ {
+ FT_Stream stream = parser->stream;
+ FT_Memory memory = parser->root.memory;
+ FT_Error error = 0;
+ FT_Long size;
+
+
+ if ( parser->in_pfb )
+ {
+ /* in the case of the PFB format, the private dictionary can be */
+ /* made of several segments. We thus first read the number of */
+ /* segments to compute the total size of the private dictionary */
+ /* then re-read them into memory. */
+ FT_Long start_pos = FT_STREAM_POS();
+ FT_UShort tag;
+
+
+ parser->private_len = 0;
+ for (;;)
+ {
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error )
+ goto Fail;
+
+ if ( tag != 0x8002U )
+ break;
+
+ parser->private_len += size;
+
+ if ( FT_STREAM_SKIP( size ) )
+ goto Fail;
+ }
+
+ /* Check that we have a private dictionary there */
+ /* and allocate private dictionary buffer */
+ if ( parser->private_len == 0 )
+ {
+ FT_ERROR(( "T1_Get_Private_Dict:" ));
+ FT_ERROR(( " invalid private dictionary section\n" ));
+ error = T1_Err_Invalid_File_Format;
+ goto Fail;
+ }
+
+ if ( FT_STREAM_SEEK( start_pos ) ||
+ FT_ALLOC( parser->private_dict, parser->private_len ) )
+ goto Fail;
+
+ parser->private_len = 0;
+ for (;;)
+ {
+ error = read_pfb_tag( stream, &tag, &size );
+ if ( error || tag != 0x8002U )
+ {
+ error = T1_Err_Ok;
+ break;
+ }
+
+ if ( FT_STREAM_READ( parser->private_dict + parser->private_len, size ) )
+ goto Fail;
+
+ parser->private_len += size;
+ }
+ }
+ else
+ {
+ /* we have already `loaded' the whole PFA font file into memory; */
+ /* if this is a memory resource, allocate a new block to hold */
+ /* the private dict. Otherwise, simply overwrite into the base */
+ /* dictionary block in the heap. */
+
+ /* first of all, look at the `eexec' keyword */
+ FT_Byte* cur = parser->base_dict;
+ FT_Byte* limit = cur + parser->base_len;
+ FT_Byte c;
+
+
+ for (;;)
+ {
+ c = cur[0];
+ if ( c == 'e' && cur + 9 < limit ) /* 9 = 5 letters for `eexec' + */
+ /* newline + 4 chars */
+ {
+ if ( cur[1] == 'e' && cur[2] == 'x' &&
+ cur[3] == 'e' && cur[4] == 'c' )
+ {
+ cur += 6; /* we skip the newling after the `eexec' */
+
+ /* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
+ /* skip the extra \n if we find it */
+ if ( cur[0] == '\n' )
+ cur++;
+
+ break;
+ }
+ }
+ cur++;
+ if ( cur >= limit )
+ {
+ FT_ERROR(( "T1_Get_Private_Dict:" ));
+ FT_ERROR(( " could not find `eexec' keyword\n" ));
+ error = T1_Err_Invalid_File_Format;
+ goto Exit;
+ }
+ }
+
+ /* now determine where to write the _encrypted_ binary private */
+ /* dictionary. We overwrite the base dictionary for disk-based */
+ /* resources and allocate a new block otherwise */
+
+ size = (FT_Long)( parser->base_len - ( cur - parser->base_dict ) );
+
+ if ( parser->in_memory )
+ {
+ /* note that we allocate one more byte to put a terminating `0' */
+ if ( FT_ALLOC( parser->private_dict, size + 1 ) )
+ goto Fail;
+ parser->private_len = size;
+ }
+ else
+ {
+ parser->single_block = 1;
+ parser->private_dict = parser->base_dict;
+ parser->private_len = size;
+ parser->base_dict = 0;
+ parser->base_len = 0;
+ }
+
+ /* now determine whether the private dictionary is encoded in binary */
+ /* or hexadecimal ASCII format -- decode it accordingly */
+
+ /* we need to access the next 4 bytes (after the final \r following */
+ /* the `eexec' keyword); if they all are hexadecimal digits, then */
+ /* we have a case of ASCII storage */
+
+ if ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
+ hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )
+
+ /* binary encoding -- `simply' copy the private dict */
+ FT_MEM_COPY( parser->private_dict, cur, size );
+
+ else
+ {
+ /* ASCII hexadecimal encoding */
+
+ FT_Byte* write;
+ FT_Int count;
+
+
+ write = parser->private_dict;
+ count = 0;
+
+ for ( ;cur < limit; cur++ )
+ {
+ int hex1;
+
+
+ /* check for newline */
+ if ( cur[0] == '\r' || cur[0] == '\n' )
+ continue;
+
+ /* exit if we have a non-hexadecimal digit that isn't a newline */
+ hex1 = hexa_value( cur[0] );
+ if ( hex1 < 0 || cur + 1 >= limit )
+ break;
+
+ /* otherwise, store byte */
+ *write++ = (FT_Byte)( ( hex1 << 4 ) | hexa_value( cur[1] ) );
+ count++;
+ cur++;
+ }
+
+ /* put a safeguard */
+ parser->private_len = write - parser->private_dict;
+ *write++ = 0;
+ }
+ }
+
+ /* we now decrypt the encoded binary private dictionary */
+ psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );
+ parser->root.base = parser->private_dict;
+ parser->root.cursor = parser->private_dict;
+ parser->root.limit = parser->root.cursor + parser->private_len;
+
+ Fail:
+ Exit:
+ return error;
+ }
+
+
+/* END */
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