?? t42parse.c
字號:
for (;;)
{
/* The format is simple: */
/* `/glyphname' + index [+ def] */
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
if ( cur >= limit )
break;
/* We stop when we find an `end' keyword or '>' */
if ( *cur == 'e' &&
cur + 3 < limit &&
cur[1] == 'n' &&
cur[2] == 'd' &&
t42_is_space( cur[3] ) )
break;
if ( *cur == '>' )
break;
T1_Skip_PS_Token( parser );
if ( parser->root.error )
return;
if ( *cur == '/' )
{
FT_PtrDist len;
if ( cur + 1 >= limit )
{
FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
error = T42_Err_Invalid_File_Format;
goto Fail;
}
cur++; /* skip `/' */
len = parser->root.cursor - cur;
error = T1_Add_Table( name_table, n, cur, len + 1 );
if ( error )
goto Fail;
/* add a trailing zero to the name table */
name_table->elements[n][len] = '\0';
/* record index of /.notdef */
if ( *cur == '.' &&
ft_strcmp( ".notdef",
(const char*)(name_table->elements[n]) ) == 0 )
{
notdef_index = n;
notdef_found = 1;
}
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
(void)T1_ToInt( parser );
if ( parser->root.cursor >= limit )
{
FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
error = T42_Err_Invalid_File_Format;
goto Fail;
}
len = parser->root.cursor - cur;
error = T1_Add_Table( code_table, n, cur, len + 1 );
if ( error )
goto Fail;
code_table->elements[n][len] = '\0';
n++;
if ( n >= loader->num_glyphs )
break;
}
}
loader->num_glyphs = n;
if ( !notdef_found )
{
FT_ERROR(( "t42_parse_charstrings: no /.notdef glyph!\n" ));
error = T42_Err_Invalid_File_Format;
goto Fail;
}
/* if /.notdef does not occupy index 0, do our magic. */
if ( ft_strcmp( (const char*)".notdef",
(const char*)name_table->elements[0] ) )
{
/* Swap glyph in index 0 with /.notdef glyph. First, add index 0 */
/* name and code entries to swap_table. Then place notdef_index */
/* name and code entries into swap_table. Then swap name and code */
/* entries at indices notdef_index and 0 using values stored in */
/* swap_table. */
/* Index 0 name */
error = T1_Add_Table( swap_table, 0,
name_table->elements[0],
name_table->lengths [0] );
if ( error )
goto Fail;
/* Index 0 code */
error = T1_Add_Table( swap_table, 1,
code_table->elements[0],
code_table->lengths [0] );
if ( error )
goto Fail;
/* Index notdef_index name */
error = T1_Add_Table( swap_table, 2,
name_table->elements[notdef_index],
name_table->lengths [notdef_index] );
if ( error )
goto Fail;
/* Index notdef_index code */
error = T1_Add_Table( swap_table, 3,
code_table->elements[notdef_index],
code_table->lengths [notdef_index] );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, notdef_index,
swap_table->elements[0],
swap_table->lengths [0] );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, notdef_index,
swap_table->elements[1],
swap_table->lengths [1] );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, 0,
swap_table->elements[2],
swap_table->lengths [2] );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, 0,
swap_table->elements[3],
swap_table->lengths [3] );
if ( error )
goto Fail;
}
return;
Fail:
parser->root.error = error;
}
static FT_Error
t42_load_keyword( T42_Face face,
T42_Loader loader,
T1_Field field )
{
FT_Error error;
void* dummy_object;
void** objects;
FT_UInt max_objects = 0;
/* if the keyword has a dedicated callback, call it */
if ( field->type == T1_FIELD_TYPE_CALLBACK )
{
field->reader( (FT_Face)face, loader );
error = loader->parser.root.error;
goto Exit;
}
/* now the keyword is either a simple field or a table of fields; */
/* we are now going to take care of it */
switch ( field->location )
{
case T1_FIELD_LOCATION_FONT_INFO:
dummy_object = &face->type1.font_info;
break;
case T1_FIELD_LOCATION_BBOX:
dummy_object = &face->type1.font_bbox;
break;
default:
dummy_object = &face->type1;
}
objects = &dummy_object;
if ( field->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
field->type == T1_FIELD_TYPE_FIXED_ARRAY )
error = T1_Load_Field_Table( &loader->parser, field,
objects, max_objects, 0 );
else
error = T1_Load_Field( &loader->parser, field,
objects, max_objects, 0 );
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
t42_parse_dict( T42_Face face,
T42_Loader loader,
FT_Byte* base,
FT_Long size )
{
T42_Parser parser = &loader->parser;
FT_Byte* limit;
FT_Int n_keywords = (FT_Int)( sizeof ( t42_keywords ) /
sizeof ( t42_keywords[0] ) );
parser->root.cursor = base;
parser->root.limit = base + size;
parser->root.error = T42_Err_Ok;
limit = parser->root.limit;
T1_Skip_Spaces( parser );
while ( parser->root.cursor < limit )
{
FT_Byte* cur;
cur = parser->root.cursor;
/* look for `FontDirectory' which causes problems for some fonts */
if ( *cur == 'F' && cur + 25 < limit &&
ft_strncmp( (char*)cur, "FontDirectory", 13 ) == 0 )
{
FT_Byte* cur2;
/* skip the `FontDirectory' keyword */
T1_Skip_PS_Token( parser );
T1_Skip_Spaces ( parser );
cur = cur2 = parser->root.cursor;
/* look up the `known' keyword */
while ( cur < limit )
{
if ( *cur == 'k' && cur + 5 < limit &&
ft_strncmp( (char*)cur, "known", 5 ) == 0 )
break;
T1_Skip_PS_Token( parser );
if ( parser->root.error )
goto Exit;
T1_Skip_Spaces ( parser );
cur = parser->root.cursor;
}
if ( cur < limit )
{
T1_TokenRec token;
/* skip the `known' keyword and the token following it */
T1_Skip_PS_Token( parser );
T1_ToToken( parser, &token );
/* if the last token was an array, skip it! */
if ( token.type == T1_TOKEN_TYPE_ARRAY )
cur2 = parser->root.cursor;
}
parser->root.cursor = cur2;
}
/* look for immediates */
else if ( *cur == '/' && cur + 2 < limit )
{
FT_PtrDist len;
cur++;
parser->root.cursor = cur;
T1_Skip_PS_Token( parser );
if ( parser->root.error )
goto Exit;
len = parser->root.cursor - cur;
if ( len > 0 && len < 22 && parser->root.cursor < limit )
{
int i;
/* now compare the immediate name to the keyword table */
/* loop through all known keywords */
for ( i = 0; i < n_keywords; i++ )
{
T1_Field keyword = (T1_Field)&t42_keywords[i];
FT_Byte *name = (FT_Byte*)keyword->ident;
if ( !name )
continue;
if ( cur[0] == name[0] &&
len == (FT_PtrDist)ft_strlen( (const char *)name ) &&
ft_memcmp( cur, name, len ) == 0 )
{
/* we found it -- run the parsing callback! */
parser->root.error = t42_load_keyword( face,
loader,
keyword );
if ( parser->root.error )
return parser->root.error;
break;
}
}
}
}
else
{
T1_Skip_PS_Token( parser );
if ( parser->root.error )
goto Exit;
}
T1_Skip_Spaces( parser );
}
Exit:
return parser->root.error;
}
FT_LOCAL_DEF( void )
t42_loader_init( T42_Loader loader,
T42_Face face )
{
FT_UNUSED( face );
FT_MEM_ZERO( loader, sizeof ( *loader ) );
loader->num_glyphs = 0;
loader->num_chars = 0;
/* initialize the tables -- simply set their `init' field to 0 */
loader->encoding_table.init = 0;
loader->charstrings.init = 0;
loader->glyph_names.init = 0;
}
FT_LOCAL_DEF( void )
t42_loader_done( T42_Loader loader )
{
T42_Parser parser = &loader->parser;
/* finalize tables */
T1_Release_Table( &loader->encoding_table );
T1_Release_Table( &loader->charstrings );
T1_Release_Table( &loader->glyph_names );
T1_Release_Table( &loader->swap_table );
/* finalize parser */
t42_parser_done( parser );
}
/* END */
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