+++ /dev/null
-/***************************************************************************/
-/* */
-/* z1parse.c */
-/* */
-/* Experimental Type 1 parser (body). */
-/* */
-/* Copyright 1996-2000 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 `Z1_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 `z1load.c' to see how data is loaded from the font file. */
- /* */
- /*************************************************************************/
-
-
-#include <freetype/internal/ftdebug.h>
-#include <freetype/internal/ftcalc.h>
-#include <freetype/internal/ftobjs.h>
-#include <freetype/internal/ftstream.h>
-#include <freetype/internal/t1errors.h>
-
-
-#ifdef FT_FLAT_COMPILE
-
-#include "z1parse.h"
-
-#else
-
-#include <freetype/src/type1z/z1parse.h>
-
-#endif
-
-
-#include <string.h> /* for strncmp() */
-
-
- /*************************************************************************/
- /* */
- /* 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_z1parse
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** IMPLEMENTATION OF Z1_TABLE OBJECT *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Z1_New_Table */
- /* */
- /* <Description> */
- /* Initialises a Z1_Table. */
- /* */
- /* <InOut> */
- /* table :: The address of the target table. */
- /* */
- /* <Input> */
- /* count :: The table size = the maximum number of elements. */
- /* */
- /* memory :: The memory object to use for all subsequent */
- /* reallocations. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- LOCAL_FUNC
- FT_Error Z1_New_Table( Z1_Table* table,
- FT_Int count,
- FT_Memory memory )
- {
- FT_Error error;
-
-
- table->memory = memory;
- if ( ALLOC_ARRAY( table->elements, count, FT_Byte* ) ||
- ALLOC_ARRAY( table->lengths, count, FT_Byte* ) )
- goto Exit;
-
- table->max_elems = count;
- table->init = 0xdeadbeef;
- table->num_elems = 0;
- table->block = 0;
- table->capacity = 0;
- table->cursor = 0;
-
- Exit:
- if ( error )
- FREE( table->elements );
-
- return error;
- }
-
-
- static
- void shift_elements( Z1_Table* table,
- FT_Byte* old_base )
- {
- FT_Long delta = table->block - old_base;
- FT_Byte** offset = table->elements;
- FT_Byte** limit = offset + table->max_elems;
-
-
- if ( delta )
- for ( ; offset < limit; offset++ )
- {
- if ( offset[0] )
- offset[0] += delta;
- }
- }
-
-
- static
- FT_Error reallocate_t1_table( Z1_Table* table,
- FT_Int new_size )
- {
- FT_Memory memory = table->memory;
- FT_Byte* old_base = table->block;
- FT_Error error;
-
-
- /* reallocate the base block */
- if ( REALLOC( table->block, table->capacity, new_size ) )
- return error;
-
- table->capacity = new_size;
-
- /* shift all offsets if necessary */
- if ( old_base )
- shift_elements( table, old_base );
-
- return T1_Err_Ok;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Z1_Add_Table */
- /* */
- /* <Description> */
- /* Adds an object to a Z1_Table, possibly growing its memory block. */
- /* */
- /* <InOut> */
- /* table :: The target table. */
- /* */
- /* <Input> */
- /* index :: The index of the object in the table. */
- /* */
- /* object :: The address of the object to copy in memory. */
- /* */
- /* length :: The length in bytes of the source object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. An error is returned if a */
- /* reallocation fails. */
- /* */
- LOCAL_FUNC
- FT_Error Z1_Add_Table( Z1_Table* table,
- FT_Int index,
- void* object,
- FT_Int length )
- {
- if ( index < 0 || index > table->max_elems )
- {
- FT_ERROR(( "Z1_Add_Table: invalid index\n" ));
- return T1_Err_Syntax_Error;
- }
-
- /* grow the base block if needed */
- if ( table->cursor + length > table->capacity )
- {
- FT_Error error;
- FT_Int new_size = table->capacity;
-
-
- while ( new_size < table->cursor + length )
- new_size += 1024;
-
- error = reallocate_t1_table( table, new_size );
- if ( error )
- return error;
- }
-
- /* add the object to the base block and adjust offset */
- table->elements[index] = table->block + table->cursor;
- table->lengths [index] = length;
- MEM_Copy( table->block + table->cursor, object, length );
-
- table->cursor += length;
- return T1_Err_Ok;
- }
-
-
-#if 0
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Z1_Done_Table */
- /* */
- /* <Description> */
- /* Finalizes a Z1_Table (i.e., reallocate it to its current cursor). */
- /* */
- /* <InOut> */
- /* table :: The target table. */
- /* */
- /* <Note> */
- /* This function does NOT release the heap's memory block. It is up */
- /* to the caller to clean it, or reference it in its own structures. */
- /* */
- LOCAL_FUNC
- void Z1_Done_Table( Z1_Table* table )
- {
- FT_Memory memory = table->memory;
- FT_Error error;
- FT_Byte* old_base;
-
-
- /* should never fail, as rec.cursor <= rec.size */
- old_base = table->block;
- if ( !old_base )
- return;
-
- (void)REALLOC( table->block, table->capacity, table->cursor );
- table->capacity = table->cursor;
-
- if ( old_base != table->block )
- shift_elements( table, old_base );
- }
-
-#endif /* 0 */
-
-
- LOCAL_FUNC
- void Z1_Release_Table( Z1_Table* table )
- {
- FT_Memory memory = table->memory;
-
-
- if ( table->init == (FT_Long)0xDEADBEEF )
- {
- FREE( table->block );
- FREE( table->elements );
- FREE( table->lengths );
- table->init = 0;
- }
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** INPUT STREAM PARSER *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
-#define IS_Z1_WHITESPACE( c ) ( (c) == ' ' || (c) == '\t' )
-#define IS_Z1_LINESPACE( c ) ( (c) == '\r' || (c) == '\n' )
-
-#define IS_Z1_SPACE( c ) ( IS_Z1_WHITESPACE( c ) || IS_Z1_LINESPACE( c ) )
-
-
- LOCAL_FUNC
- void Z1_Skip_Spaces( Z1_Parser* parser )
- {
- FT_Byte* cur = parser->cursor;
- FT_Byte* limit = parser->limit;
-
-
- while ( cur < limit )
- {
- FT_Byte c = *cur;
-
-
- if ( !IS_Z1_SPACE( c ) )
- break;
- cur++;
- }
- parser->cursor = cur;
- }
-
-
- LOCAL_FUNC
- void Z1_ToToken( Z1_Parser* parser,
- Z1_Token_Rec* token )
- {
- FT_Byte* cur;
- FT_Byte* limit;
- FT_Byte starter, ender;
- FT_Int embed;
-
-
- token->type = t1_token_none;
- token->start = 0;
- token->limit = 0;
-
- /* first of all, skip space */
- Z1_Skip_Spaces( parser );
-
- cur = parser->cursor;
- limit = parser->limit;
-
- if ( cur < limit )
- {
- switch ( *cur )
- {
- /************* check for strings ***********************/
- case '(':
- token->type = t1_token_string;
- ender = ')';
- goto Lookup_Ender;
-
- /************* check for programs/array ****************/
- case '{':
- token->type = t1_token_array;
- ender = '}';
- goto Lookup_Ender;
-
- /************* check for table/array ******************/
- case '[':
- token->type = t1_token_array;
- ender = ']';
-
- Lookup_Ender:
- embed = 1;
- starter = *cur++;
- token->start = cur;
- while ( cur < limit )
- {
- if ( *cur == starter )
- embed++;
- else if ( *cur == ender )
- {
- embed--;
- if ( embed <= 0 )
- {
- token->limit = cur++;
- break;
- }
- }
- cur++;
- }
- break;
-
- /* **************** otherwise, it's any token **********/
- default:
- token->start = cur++;
- token->type = t1_token_any;
- while ( cur < limit && !IS_Z1_SPACE( *cur ) )
- cur++;
-
- token->limit = cur;
- }
-
- if ( !token->limit )
- {
- token->start = 0;
- token->type = t1_token_none;
- }
-
- parser->cursor = cur;
- }
- }
-
-
- LOCAL_FUNC
- void Z1_ToTokenArray( Z1_Parser* parser,
- Z1_Token_Rec* tokens,
- FT_UInt max_tokens,
- FT_Int* pnum_tokens )
- {
- Z1_Token_Rec master;
-
-
- *pnum_tokens = -1;
-
- Z1_ToToken( parser, &master );
- if ( master.type == t1_token_array )
- {
- FT_Byte* old_cursor = parser->cursor;
- FT_Byte* old_limit = parser->limit;
- Z1_Token_Rec* cur = tokens;
- Z1_Token_Rec* limit = cur + max_tokens;
-
-
- parser->cursor = master.start;
- parser->limit = master.limit;
-
- while ( parser->cursor < parser->limit )
- {
- Z1_Token_Rec token;
-
-
- Z1_ToToken( parser, &token );
- if ( !token.type )
- break;
-
- if ( cur < limit )
- *cur = token;
-
- cur++;
- }
-
- *pnum_tokens = cur - tokens;
-
- parser->cursor = old_cursor;
- parser->limit = old_limit;
- }
- }
-
-
- static
- FT_Long t1_toint( FT_Byte** cursor,
- FT_Byte* limit )
- {
- FT_Long result = 0;
- FT_Byte* cur = *cursor;
- FT_Byte c, d;
-
-
- for ( ; cur < limit; cur++ )
- {
- c = *cur;
- d = (FT_Byte)( c - '0' );
- if ( d < 10 )
- break;
-
- if ( c == '-' )
- {
- cur++;
- break;
- }
- }
-
- if ( cur < limit )
- {
- do
- {
- d = (FT_Byte)( cur[0] - '0' );
- if ( d >= 10 )
- break;
-
- result = result * 10 + d;
- cur++;
-
- } while ( cur < limit );
-
- if ( c == '-' )
- result = -result;
- }
-
- *cursor = cur;
- return result;
- }
-
-
- static
- FT_Long t1_tofixed( FT_Byte** cursor,
- FT_Byte* limit,
- FT_Long power_ten )
- {
- FT_Byte* cur = *cursor;
- FT_Long num, divider, result;
- FT_Int sign = 0;
- FT_Byte d;
-
-
- if ( cur >= limit )
- return 0;
-
- /* first of all, read the integer part */
- result = t1_toint( &cur, limit ) << 16;
- num = 0;
- divider = 1;
-
- if ( result < 0 )
- {
- sign = 1;
- result = -result;
- }
-
- if ( cur >= limit )
- goto Exit;
-
- /* read decimal part, if any */
- if ( *cur == '.' && cur + 1 < limit )
- {
- cur++;
-
- for (;;)
- {
- d = (FT_Byte)( *cur - '0' );
- if ( d >= 10 )
- break;
-
- if ( divider < 10000000L )
- {
- num = num * 10 + d;
- divider *= 10;
- }
-
- cur++;
- if ( cur >= limit )
- break;
- }
- }
-
- /* read exponent, if any */
- if ( cur + 1 < limit && ( *cur == 'e' || *cur == 'E' ) )
- {
- cur++;
- power_ten += t1_toint( &cur, limit );
- }
-
- Exit:
- /* raise to power of ten if needed */
- while ( power_ten > 0 )
- {
- result = result * 10;
- num = num * 10;
- power_ten--;
- }
-
- while ( power_ten < 0 )
- {
- result = result / 10;
- divider = divider * 10;
- power_ten++;
- }
-
- if ( num )
- result += FT_DivFix( num, divider );
-
- if ( sign )
- result = -result;
-
- *cursor = cur;
- return result;
- }
-
-
- static
- FT_Int t1_tocoordarray( FT_Byte** cursor,
- FT_Byte* limit,
- FT_Int max_coords,
- FT_Short* coords )
- {
- FT_Byte* cur = *cursor;
- FT_Int count = 0;
- FT_Byte c, ender;
-
-
- if ( cur >= limit )
- goto Exit;
-
- /* check for the beginning of an array. If not, only one number will */
- /* be read */
- c = *cur;
- ender = 0;
-
- if ( c == '[' )
- ender = ']';
-
- if ( c == '{' )
- ender = '}';
-
- if ( ender )
- cur++;
-
- /* now, read the coordinates */
- for ( ; cur < limit; )
- {
- /* skip whitespace in front of data */
- for (;;)
- {
- c = *cur;
- if ( c != ' ' && c != '\t' )
- break;
-
- cur++;
- if ( cur >= limit )
- goto Exit;
- }
-
- if ( count >= max_coords || c == ender )
- break;
-
- coords[count] = (FT_Short)( t1_tofixed( &cur, limit, 0 ) >> 16 );
- count++;
-
- if ( !ender )
- break;
- }
-
- Exit:
- *cursor = cur;
- return count;
- }
-
-
- static
- FT_Int t1_tofixedarray( FT_Byte** cursor,
- FT_Byte* limit,
- FT_Int max_values,
- FT_Fixed* values,
- FT_Int power_ten )
- {
- FT_Byte* cur = *cursor;
- FT_Int count = 0;
- FT_Byte c, ender;
-
-
- if ( cur >= limit ) goto Exit;
-
- /* check for the beginning of an array. If not, only one number will */
- /* be read */
- c = *cur;
- ender = 0;
-
- if ( c == '[' )
- ender = ']';
-
- if ( c == '{' )
- ender = '}';
-
- if ( ender )
- cur++;
-
- /* now, read the values */
- for ( ; cur < limit; )
- {
- /* skip whitespace in front of data */
- for (;;)
- {
- c = *cur;
- if ( c != ' ' && c != '\t' )
- break;
-
- cur++;
- if ( cur >= limit )
- goto Exit;
- }
-
- if ( count >= max_values || c == ender )
- break;
-
- values[count] = t1_tofixed( &cur, limit, power_ten );
- count++;
-
- if ( !ender )
- break;
- }
-
- Exit:
- *cursor = cur;
- return count;
- }
-
-
-#if 0
-
- static
- FT_String* t1_tostring( FT_Byte** cursor,
- FT_Byte* limit,
- FT_Memory memory )
- {
- FT_Byte* cur = *cursor;
- FT_Int len = 0;
- FT_Int count;
- FT_String* result;
- FT_Error error;
-
-
- /* XXX: some stupid fonts have a `Notice' or `Copyright' string */
- /* that simply doesn't begin with an opening parenthesis, even */
- /* though they have a closing one! E.g. "amuncial.pfb" */
- /* */
- /* We must deal with these ill-fated cases there. Note that */
- /* these fonts didn't work with the old Type 1 driver as the */
- /* notice/copyright was not recognized as a valid string token */
- /* and made the old token parser commit errors. */
-
- while ( cur < limit && ( *cur == ' ' || *cur == '\t' ) )
- cur++;
- if ( cur + 1 >= limit )
- return 0;
-
- if ( *cur == '(' )
- cur++; /* skip the opening parenthesis, if there is one */
-
- *cursor = cur;
- count = 0;
-
- /* then, count its length */
- for ( ; cur < limit; cur++ )
- {
- if ( *cur == '(' )
- count++;
-
- else if ( *cur == ')' )
- {
- count--;
- if ( count < 0 )
- break;
- }
- }
-
- len = cur - *cursor;
- if ( cur >= limit || ALLOC( result, len + 1 ) )
- return 0;
-
- /* now copy the string */
- MEM_Copy( result, *cursor, len );
- result[len] = '\0';
- *cursor = cur;
- return result;
- }
-
-#endif /* 0 */
-
-
- static
- int t1_tobool( FT_Byte** cursor,
- FT_Byte* limit )
- {
- FT_Byte* cur = *cursor;
- FT_Bool result = 0;
-
-
- /* return 1 if we find `true', 0 otherwise */
- if ( cur + 3 < limit &&
- cur[0] == 't' &&
- cur[1] == 'r' &&
- cur[2] == 'u' &&
- cur[3] == 'e' )
- {
- result = 1;
- cur += 5;
- }
- else if ( cur + 4 < limit &&
- cur[0] == 'f' &&
- cur[1] == 'a' &&
- cur[2] == 'l' &&
- cur[3] == 's' &&
- cur[4] == 'e' )
- {
- result = 0;
- cur += 6;
- }
-
- *cursor = cur;
- return result;
- }
-
-
- /* Load a simple field (i.e. non-table) into the current list of objects */
- LOCAL_FUNC
- FT_Error Z1_Load_Field( Z1_Parser* parser,
- const Z1_Field_Rec* field,
- void** objects,
- FT_UInt max_objects,
- FT_ULong* pflags )
- {
- Z1_Token_Rec token;
- FT_Byte* cur;
- FT_Byte* limit;
- FT_UInt count;
- FT_UInt index;
- FT_Error error;
-
-
- Z1_ToToken( parser, &token );
- if ( !token.type )
- goto Fail;
-
- count = 1;
- index = 0;
- cur = token.start;
- limit = token.limit;
-
- if ( token.type == t1_token_array )
- {
- /* if this is an array, and we have no blend, an error occurs */
- if ( max_objects == 0 )
- goto Fail;
-
- count = max_objects;
- index = 1;
- }
-
- for ( ; count > 0; count--, index++ )
- {
- FT_Byte* q = (FT_Byte*)objects[index] + field->offset;
- FT_Long val;
- FT_String* string;
-
- switch ( field->type )
- {
- case t1_field_bool:
- val = t1_tobool( &cur, limit );
- goto Store_Integer;
-
- case t1_field_fixed:
- val = t1_tofixed( &cur, limit, 3 );
- goto Store_Integer;
-
- case t1_field_integer:
- val = t1_toint( &cur, limit );
-
- Store_Integer:
- switch ( field->size )
- {
- case 1:
- *(FT_Byte*)q = (FT_Byte)val;
- break;
-
- case 2:
- *(FT_UShort*)q = (FT_UShort)val;
- break;
-
- case 4:
- *(FT_UInt32*)q = (FT_UInt32)val;
- break;
-
- default: /* for 64-bit systems */
- *(FT_Long*)q = val;
- }
- break;
-
- case t1_field_string:
- {
- FT_Memory memory = parser->memory;
- FT_UInt len = limit-cur;
-
- if ( ALLOC( string, len + 1 ) )
- goto Exit;
-
- MEM_Copy( string, cur, len );
- string[len] = 0;
-
- *(FT_String**)q = string;
- }
- break;
-
- default:
- /* an error occured */
- goto Fail;
- }
- }
-
- if ( pflags )
- *pflags |= 1L << field->flag_bit;
-
- error = FT_Err_Ok;
-
- Exit:
- return error;
-
- Fail:
- error = T1_Err_Invalid_File_Format;
- goto Exit;
- }
-
-
-#define T1_MAX_TABLE_ELEMENTS 32
-
-
- LOCAL_FUNC
- FT_Error Z1_Load_Field_Table( Z1_Parser* parser,
- const Z1_Field_Rec* field,
- void** objects,
- FT_UInt max_objects,
- FT_ULong* pflags )
- {
- Z1_Token_Rec elements[T1_MAX_TABLE_ELEMENTS];
- Z1_Token_Rec* token;
- FT_Int num_elements;
- FT_Error error = 0;
- FT_Byte* old_cursor;
- FT_Byte* old_limit;
- Z1_Field_Rec fieldrec = *(Z1_Field_Rec*)field;
-
-
- Z1_ToTokenArray( parser, elements, 32, &num_elements );
- if ( num_elements < 0 )
- goto Fail;
-
- if ( num_elements > T1_MAX_TABLE_ELEMENTS )
- num_elements = T1_MAX_TABLE_ELEMENTS;
-
- old_cursor = parser->cursor;
- old_limit = parser->limit;
-
- /* we store the elements count */
- *(FT_Byte*)( (FT_Byte*)objects[0] + field->count_offset ) = num_elements;
-
- /* we now load each element, adjusting the field.offset on each one */
- token = elements;
- for ( ; num_elements > 0; num_elements--, token++ )
- {
- parser->cursor = token->start;
- parser->limit = token->limit;
- Z1_Load_Field( parser, &fieldrec, objects, max_objects, 0 );
- fieldrec.offset += fieldrec.size;
- }
-
- if ( pflags )
- *pflags |= 1L << field->flag_bit;
-
- parser->cursor = old_cursor;
- parser->limit = old_limit;
-
- Exit:
- return error;
-
- Fail:
- error = T1_Err_Invalid_File_Format;
- goto Exit;
- }
-
-
- LOCAL_FUNC
- FT_Long Z1_ToInt ( Z1_Parser* parser )
- {
- return t1_toint( &parser->cursor, parser->limit );
- }
-
-
- LOCAL_FUNC
- FT_Long Z1_ToFixed( Z1_Parser* parser,
- FT_Int power_ten )
- {
- return t1_tofixed( &parser->cursor, parser->limit, power_ten );
- }
-
-
- LOCAL_FUNC
- FT_Int Z1_ToCoordArray( Z1_Parser* parser,
- FT_Int max_coords,
- FT_Short* coords )
- {
- return t1_tocoordarray( &parser->cursor, parser->limit,
- max_coords, coords );
- }
-
-
- LOCAL_FUNC
- FT_Int Z1_ToFixedArray( Z1_Parser* parser,
- FT_Int max_values,
- FT_Fixed* values,
- FT_Int power_ten )
- {
- return t1_tofixedarray( &parser->cursor, parser->limit,
- max_values, values, power_ten );
- }
-
-
-#if 0
-
- LOCAL_FUNC
- FT_String* Z1_ToString( Z1_Parser* parser )
- {
- return t1_tostring( &parser->cursor, parser->limit, parser->memory );
- }
-
-
- LOCAL_FUNC
- FT_Bool Z1_ToBool( Z1_Parser* parser )
- {
- return t1_tobool( &parser->cursor, parser->limit );
- }
-
-#endif /* 0 */
-
-
- static
- FT_Error read_pfb_tag( FT_Stream stream,
- FT_UShort* tag,
- FT_Long* size )
- {
- FT_Error error;
-
-
- if ( READ_UShort( *tag ) )
- goto Exit;
-
- if ( *tag == 0x8001 || *tag == 0x8002 )
- {
- FT_Long asize;
-
-
- if ( READ_ULong( asize ) )
- goto Exit;
-
- /* swap between big and little endianness */
- *size = ( ( asize & 0xFF000000L ) >> 24 ) |
- ( ( asize & 0x00FF0000L ) >> 8 ) |
- ( ( asize & 0x0000FF00L ) << 8 ) |
- ( ( asize & 0x000000FFL ) << 24 );
- }
-
- Exit:
- return error;
- }
-
-
- LOCAL_FUNC
- FT_Error Z1_New_Parser( Z1_Parser* parser,
- FT_Stream stream,
- FT_Memory memory )
- {
- FT_Error error;
- FT_UShort tag;
- FT_Long size;
-
-
- parser->stream = stream;
- parser->memory = memory;
- 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;
-
- parser->cursor = 0;
- parser->limit = 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 ( FILE_Seek( 0L ) )
- goto Exit;
-
- error = read_pfb_tag( stream, &tag, &size );
- if ( error )
- goto Exit;
-
- if ( tag != 0x8001 )
- {
- /* assume that this is a PFA file for now; an error will */
- /* be produced later when more things are checked */
- (void)FILE_Seek( 0L );
- 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 ( FILE_Skip( size ) )
- goto Exit;
- }
- else
- {
- /* read segment in memory */
- if ( ALLOC( parser->base_dict, size ) ||
- FILE_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 ||
- ( strncmp( (const char*)parser->base_dict,
- "%!PS-AdobeFont-1", 16 ) &&
- strncmp( (const char*)parser->base_dict,
- "%!FontType", 10 ) ) )
- {
- FT_TRACE2(( "[not a Type1 font]\n" ));
- error = FT_Err_Unknown_File_Format;
- }
- else
- {
- parser->cursor = parser->base_dict;
- parser->limit = parser->cursor + parser->base_len;
- }
- }
-
- Exit:
- if ( error && !parser->in_memory )
- FREE( parser->base_dict );
-
- return error;
- }
-
-
- LOCAL_FUNC
- void Z1_Done_Parser( Z1_Parser* parser )
- {
- FT_Memory memory = parser->memory;
-
-
- /* always free the private dictionary */
- FREE( parser->private_dict );
-
- /* free the base dictionary only when we have a disk stream */
- if ( !parser->in_memory )
- FREE( parser->base_dict );
- }
-
-
- /* 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;
- }
-
-
- LOCAL_FUNC
- void Z1_Decrypt( FT_Byte* buffer,
- FT_Int length,
- FT_UShort seed )
- {
- while ( length > 0 )
- {
- FT_Byte plain;
-
-
- plain = ( *buffer ^ ( seed >> 8 ) );
- seed = ( *buffer + seed ) * 52845 + 22719;
- *buffer++ = plain;
- length--;
- }
- }
-
-
- LOCAL_FUNC
- FT_Error Z1_Get_Private_Dict( Z1_Parser* parser )
- {
- FT_Stream stream = parser->stream;
- FT_Memory memory = parser->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 = FILE_Pos();
- FT_UShort tag;
- FT_Long size;
-
-
- parser->private_len = 0;
- for (;;)
- {
- error = read_pfb_tag( stream, &tag, &size );
- if ( error )
- goto Fail;
-
- if ( tag != 0x8002 )
- break;
-
- parser->private_len += size;
-
- if ( FILE_Skip( size ) )
- goto Fail;
- }
-
- /* Check that we have a private dictionary there */
- /* and allocate private dictionary buffer */
- if ( parser->private_len == 0 )
- {
- FT_ERROR(( "Z1_Get_Private_Dict:" ));
- FT_ERROR(( " invalid private dictionary section\n" ));
- error = T1_Err_Invalid_File_Format;
- goto Fail;
- }
-
- if ( FILE_Seek( start_pos ) ||
- ALLOC( parser->private_dict, parser->private_len ) )
- goto Fail;
-
- parser->private_len = 0;
- for (;;)
- {
- error = read_pfb_tag( stream, &tag, &size );
- if ( error || tag != 0x8002 )
- {
- error = FT_Err_Ok;
- break;
- }
-
- if ( FILE_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(( "Z1_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 = parser->base_len - ( cur - parser->base_dict);
-
- if ( parser->in_memory )
- {
- /* note that we allocate one more byte to put a terminating `0' */
- if ( 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 */
- 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++ = ( 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 */
- Z1_Decrypt( parser->private_dict, parser->private_len, 55665 );
- parser->cursor = parser->private_dict;
- parser->limit = parser->cursor + parser->private_len;
-
- Fail:
- Exit:
- return error;
- }
-
-
-/* END */
git://git.jankratochvil.net / reactos.git / blobdiff