ref: 50ef72b6e3a33cd70c65676923f42fb75333831e
dir: /src/pfr/pfrload.c/
/***************************************************************************/ /* */ /* pfrload.c */ /* */ /* FreeType PFR loader (body). */ /* */ /* Copyright 2002, 2003, 2004, 2005 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 "pfrload.h" #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_STREAM_H #include "pfrerror.h" #undef FT_COMPONENT #define FT_COMPONENT trace_pfr /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** EXTRA ITEMS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_extra_items_skip( FT_Byte* *pp, FT_Byte* limit ) { return pfr_extra_items_parse( pp, limit, NULL, NULL ); } FT_LOCAL_DEF( FT_Error ) pfr_extra_items_parse( FT_Byte* *pp, FT_Byte* limit, PFR_ExtraItem item_list, FT_Pointer item_data ) { FT_Error error = 0; FT_Byte* p = *pp; FT_UInt num_items, item_type, item_size; PFR_CHECK( 1 ); num_items = PFR_NEXT_BYTE( p ); for ( ; num_items > 0; num_items-- ) { PFR_CHECK( 2 ); item_size = PFR_NEXT_BYTE( p ); item_type = PFR_NEXT_BYTE( p ); PFR_CHECK( item_size ); if ( item_list ) { PFR_ExtraItem extra = item_list; for ( extra = item_list; extra->parser != NULL; extra++ ) { if ( extra->type == item_type ) { error = extra->parser( p, p + item_size, item_data ); if ( error ) goto Exit; break; } } } p += item_size; } Exit: *pp = p; return error; Too_Short: FT_ERROR(( "pfr_extra_items_parse: invalid extra items table\n" )); error = PFR_Err_Invalid_Table; goto Exit; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** PFR HEADER *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static const FT_Frame_Field pfr_header_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE PFR_HeaderRec FT_FRAME_START( 58 ), FT_FRAME_ULONG ( signature ), FT_FRAME_USHORT( version ), FT_FRAME_USHORT( signature2 ), FT_FRAME_USHORT( header_size ), FT_FRAME_USHORT( log_dir_size ), FT_FRAME_USHORT( log_dir_offset ), FT_FRAME_USHORT( log_font_max_size ), FT_FRAME_UOFF3 ( log_font_section_size ), FT_FRAME_UOFF3 ( log_font_section_offset ), FT_FRAME_USHORT( phy_font_max_size ), FT_FRAME_UOFF3 ( phy_font_section_size ), FT_FRAME_UOFF3 ( phy_font_section_offset ), FT_FRAME_USHORT( gps_max_size ), FT_FRAME_UOFF3 ( gps_section_size ), FT_FRAME_UOFF3 ( gps_section_offset ), FT_FRAME_BYTE ( max_blue_values ), FT_FRAME_BYTE ( max_x_orus ), FT_FRAME_BYTE ( max_y_orus ), FT_FRAME_BYTE ( phy_font_max_size_high ), FT_FRAME_BYTE ( color_flags ), FT_FRAME_UOFF3 ( bct_max_size ), FT_FRAME_UOFF3 ( bct_set_max_size ), FT_FRAME_UOFF3 ( phy_bct_set_max_size ), FT_FRAME_USHORT( num_phy_fonts ), FT_FRAME_BYTE ( max_vert_stem_snap ), FT_FRAME_BYTE ( max_horz_stem_snap ), FT_FRAME_USHORT( max_chars ), FT_FRAME_END }; FT_LOCAL_DEF( FT_Error ) pfr_header_load( PFR_Header header, FT_Stream stream ) { FT_Error error; /* read header directly */ if ( !FT_STREAM_SEEK( 0 ) && !FT_STREAM_READ_FIELDS( pfr_header_fields, header ) ) { /* make a few adjustments to the header */ header->phy_font_max_size += (FT_UInt32)header->phy_font_max_size_high << 16; } return error; } FT_LOCAL_DEF( FT_Bool ) pfr_header_check( PFR_Header header ) { FT_Bool result = 1; /* check signature and header size */ if ( header->signature != 0x50465230L || /* "PFR0" */ header->version > 4 || header->header_size < 58 || header->signature2 != 0x0d0a ) /* CR/LF */ { result = 0; } return result; } /***********************************************************************/ /***********************************************************************/ /***** *****/ /***** PFR LOGICAL FONTS *****/ /***** *****/ /***********************************************************************/ /***********************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_log_font_count( FT_Stream stream, FT_UInt32 section_offset, FT_UInt *acount ) { FT_Error error; FT_UInt count; FT_UInt result = 0; if ( FT_STREAM_SEEK( section_offset ) || FT_READ_USHORT( count ) ) goto Exit; result = count; Exit: *acount = result; return error; } FT_LOCAL_DEF( FT_Error ) pfr_log_font_load( PFR_LogFont log_font, FT_Stream stream, FT_UInt idx, FT_UInt32 section_offset, FT_Bool size_increment ) { FT_UInt num_log_fonts; FT_UInt flags; FT_UInt32 offset; FT_UInt32 size; FT_Error error; if ( FT_STREAM_SEEK( section_offset ) || FT_READ_USHORT( num_log_fonts ) ) goto Exit; if ( idx >= num_log_fonts ) return PFR_Err_Invalid_Argument; if ( FT_STREAM_SKIP( idx * 5 ) || FT_READ_USHORT( size ) || FT_READ_UOFF3 ( offset ) ) goto Exit; /* save logical font size and offset */ log_font->size = size; log_font->offset = offset; /* now, check the rest of the table before loading it */ { FT_Byte* p; FT_Byte* limit; FT_UInt local; if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( size ) ) goto Exit; p = stream->cursor; limit = p + size; PFR_CHECK(13); log_font->matrix[0] = PFR_NEXT_LONG( p ); log_font->matrix[1] = PFR_NEXT_LONG( p ); log_font->matrix[2] = PFR_NEXT_LONG( p ); log_font->matrix[3] = PFR_NEXT_LONG( p ); flags = PFR_NEXT_BYTE( p ); local = 0; if ( flags & PFR_LOG_STROKE ) { local++; if ( flags & PFR_LOG_2BYTE_STROKE ) local++; if ( (flags & PFR_LINE_JOIN_MASK) == PFR_LINE_JOIN_MITER ) local += 3; } if ( flags & PFR_LOG_BOLD ) { local++; if ( flags & PFR_LOG_2BYTE_BOLD ) local++; } PFR_CHECK( local ); if ( flags & PFR_LOG_STROKE ) { log_font->stroke_thickness = ( flags & PFR_LOG_2BYTE_STROKE ) ? PFR_NEXT_SHORT( p ) : PFR_NEXT_BYTE( p ); if ( ( flags & PFR_LINE_JOIN_MASK ) == PFR_LINE_JOIN_MITER ) log_font->miter_limit = PFR_NEXT_LONG( p ); } if ( flags & PFR_LOG_BOLD ) { log_font->bold_thickness = ( flags & PFR_LOG_2BYTE_BOLD ) ? PFR_NEXT_SHORT( p ) : PFR_NEXT_BYTE( p ); } if ( flags & PFR_LOG_EXTRA_ITEMS ) { error = pfr_extra_items_skip( &p, limit ); if (error) goto Fail; } PFR_CHECK(5); log_font->phys_size = PFR_NEXT_USHORT( p ); log_font->phys_offset = PFR_NEXT_ULONG( p ); if ( size_increment ) { PFR_CHECK( 1 ); log_font->phys_size += (FT_UInt32)PFR_NEXT_BYTE( p ) << 16; } } Fail: FT_FRAME_EXIT(); Exit: return error; Too_Short: FT_ERROR(( "pfr_log_font_load: invalid logical font table\n" )); error = PFR_Err_Invalid_Table; goto Fail; } /***********************************************************************/ /***********************************************************************/ /***** *****/ /***** PFR PHYSICAL FONTS *****/ /***** *****/ /***********************************************************************/ /***********************************************************************/ /* load bitmap strikes lists */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_bitmap_info( FT_Byte* p, FT_Byte* limit, PFR_PhyFont phy_font ) { FT_Memory memory = phy_font->memory; PFR_Strike strike; FT_UInt flags0; FT_UInt n, count, size1; FT_Error error = 0; PFR_CHECK( 5 ); p += 3; /* skip bctSize */ flags0 = PFR_NEXT_BYTE( p ); count = PFR_NEXT_BYTE( p ); /* re-allocate when needed */ if ( phy_font->num_strikes + count > phy_font->max_strikes ) { FT_UInt new_max = FT_PAD_CEIL( phy_font->num_strikes + count, 4 ); if ( FT_RENEW_ARRAY( phy_font->strikes, phy_font->num_strikes, new_max ) ) goto Exit; phy_font->max_strikes = new_max; } size1 = 1 + 1 + 1 + 2 + 2 + 1; if ( flags0 & PFR_STRIKE_2BYTE_XPPM ) size1++; if ( flags0 & PFR_STRIKE_2BYTE_YPPM ) size1++; if ( flags0 & PFR_STRIKE_3BYTE_SIZE ) size1++; if ( flags0 & PFR_STRIKE_3BYTE_OFFSET ) size1++; if ( flags0 & PFR_STRIKE_2BYTE_COUNT ) size1++; strike = phy_font->strikes + phy_font->num_strikes; PFR_CHECK( count * size1 ); for ( n = 0; n < count; n++, strike++ ) { strike->x_ppm = ( flags0 & PFR_STRIKE_2BYTE_XPPM ) ? PFR_NEXT_USHORT( p ) : PFR_NEXT_BYTE( p ); strike->y_ppm = ( flags0 & PFR_STRIKE_2BYTE_YPPM ) ? PFR_NEXT_USHORT( p ) : PFR_NEXT_BYTE( p ); strike->flags = PFR_NEXT_BYTE( p ); strike->bct_size = ( flags0 & PFR_STRIKE_3BYTE_SIZE ) ? PFR_NEXT_ULONG( p ) : PFR_NEXT_USHORT( p ); strike->bct_offset = ( flags0 & PFR_STRIKE_3BYTE_OFFSET ) ? PFR_NEXT_ULONG( p ) : PFR_NEXT_USHORT( p ); strike->num_bitmaps = ( flags0 & PFR_STRIKE_2BYTE_COUNT ) ? PFR_NEXT_USHORT( p ) : PFR_NEXT_BYTE( p ); } phy_font->num_strikes += count; Exit: return error; Too_Short: error = PFR_Err_Invalid_Table; FT_ERROR(( "pfr_extra_item_load_bitmap_info: invalid bitmap info table\n" )); goto Exit; } /* Load font ID. This is a so-called "unique" name that is rather * long and descriptive (like "Tiresias ScreenFont v7.51"). * * Note that a PFR font's family name is contained in an *undocumented* * string of the "auxiliary data" portion of a physical font record. This * may also contain the "real" style name! * * If no family name is present, the font ID is used instead for the * family. */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_font_id( FT_Byte* p, FT_Byte* limit, PFR_PhyFont phy_font ) { FT_Error error = 0; FT_Memory memory = phy_font->memory; FT_PtrDist len = limit - p; if ( phy_font->font_id != NULL ) goto Exit; if ( FT_ALLOC( phy_font->font_id, len + 1 ) ) goto Exit; /* copy font ID name, and terminate it for safety */ FT_MEM_COPY( phy_font->font_id, p, len ); phy_font->font_id[len] = 0; Exit: return error; } /* load stem snap tables */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_stem_snaps( FT_Byte* p, FT_Byte* limit, PFR_PhyFont phy_font ) { FT_UInt count, num_vert, num_horz; FT_Int* snaps; FT_Error error = 0; FT_Memory memory = phy_font->memory; if ( phy_font->vertical.stem_snaps != NULL ) goto Exit; PFR_CHECK( 1 ); count = PFR_NEXT_BYTE( p ); num_vert = count & 15; num_horz = count >> 4; count = num_vert + num_horz; PFR_CHECK( count * 2 ); if ( FT_NEW_ARRAY( snaps, count ) ) goto Exit; phy_font->vertical.stem_snaps = snaps; phy_font->horizontal.stem_snaps = snaps + num_vert; for ( ; count > 0; count--, snaps++ ) *snaps = FT_NEXT_SHORT( p ); Exit: return error; Too_Short: error = PFR_Err_Invalid_Table; FT_ERROR(( "pfr_exta_item_load_stem_snaps: invalid stem snaps table\n" )); goto Exit; } /* load kerning pair data */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_kerning_pairs( FT_Byte* p, FT_Byte* limit, PFR_PhyFont phy_font ) { PFR_KernItem item; FT_Error error = 0; FT_Memory memory = phy_font->memory; FT_TRACE2(( "pfr_extra_item_load_kerning_pairs()\n" )); if ( FT_NEW( item ) ) goto Exit; PFR_CHECK( 4 ); item->pair_count = PFR_NEXT_BYTE( p ); item->base_adj = PFR_NEXT_SHORT( p ); item->flags = PFR_NEXT_BYTE( p ); item->offset = phy_font->offset + ( p - phy_font->cursor ); #ifndef PFR_CONFIG_NO_CHECKS item->pair_size = 3; if ( item->flags & PFR_KERN_2BYTE_CHAR ) item->pair_size += 2; if ( item->flags & PFR_KERN_2BYTE_ADJ ) item->pair_size += 1; PFR_CHECK( item->pair_count * item->pair_size ); #endif /* load first and last pairs into the item to speed up */ /* lookup later... */ if ( item->pair_count > 0 ) { FT_UInt char1, char2; FT_Byte* q; if ( item->flags & PFR_KERN_2BYTE_CHAR ) { q = p; char1 = PFR_NEXT_USHORT( q ); char2 = PFR_NEXT_USHORT( q ); item->pair1 = PFR_KERN_INDEX( char1, char2 ); q = p + item->pair_size * ( item->pair_count - 1 ); char1 = PFR_NEXT_USHORT( q ); char2 = PFR_NEXT_USHORT( q ); item->pair2 = PFR_KERN_INDEX( char1, char2 ); } else { q = p; char1 = PFR_NEXT_BYTE( q ); char2 = PFR_NEXT_BYTE( q ); item->pair1 = PFR_KERN_INDEX( char1, char2 ); q = p + item->pair_size * ( item->pair_count - 1 ); char1 = PFR_NEXT_BYTE( q ); char2 = PFR_NEXT_BYTE( q ); item->pair2 = PFR_KERN_INDEX( char1, char2 ); } /* add new item to the current list */ item->next = NULL; *phy_font->kern_items_tail = item; phy_font->kern_items_tail = &item->next; phy_font->num_kern_pairs += item->pair_count; } else { /* empty item! */ FT_FREE( item ); } Exit: return error; Too_Short: FT_FREE( item ); error = PFR_Err_Invalid_Table; FT_ERROR(( "pfr_extra_item_load_kerning_pairs: " "invalid kerning pairs table\n" )); goto Exit; } static const PFR_ExtraItemRec pfr_phy_font_extra_items[] = { { 1, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_bitmap_info }, { 2, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_font_id }, { 3, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_stem_snaps }, { 4, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_kerning_pairs }, { 0, NULL } }; /* Loads a name from the auxiliary data. Since this extracts undocumented * strings from the font file, we need to be careful here. */ static FT_Error pfr_aux_name_load( FT_Byte* p, FT_UInt len, FT_Memory memory, FT_String* *astring ) { FT_Error error = 0; FT_String* result = NULL; FT_UInt n, ok; if ( len > 0 && p[len - 1] == 0 ) len--; /* check that each character is ASCII for making sure not to load garbage */ ok = ( len > 0 ); for ( n = 0; n < len; n++ ) if ( p[n] < 32 || p[n] > 127 ) { ok = 0; break; } if ( ok ) { if ( FT_ALLOC( result, len + 1 ) ) goto Exit; FT_MEM_COPY( result, p, len ); result[len] = 0; } Exit: *astring = result; return error; } FT_LOCAL_DEF( void ) pfr_phy_font_done( PFR_PhyFont phy_font, FT_Memory memory ) { FT_FREE( phy_font->font_id ); FT_FREE( phy_font->family_name ); FT_FREE( phy_font->style_name ); FT_FREE( phy_font->vertical.stem_snaps ); phy_font->vertical.num_stem_snaps = 0; phy_font->horizontal.stem_snaps = NULL; phy_font->horizontal.num_stem_snaps = 0; FT_FREE( phy_font->strikes ); phy_font->num_strikes = 0; phy_font->max_strikes = 0; FT_FREE( phy_font->chars ); phy_font->num_chars = 0; phy_font->chars_offset = 0; FT_FREE( phy_font->blue_values ); phy_font->num_blue_values = 0; { PFR_KernItem item, next; item = phy_font->kern_items; while ( item ) { next = item->next; FT_FREE( item ); item = next; } phy_font->kern_items = NULL; phy_font->kern_items_tail = NULL; } phy_font->num_kern_pairs = 0; } FT_LOCAL_DEF( FT_Error ) pfr_phy_font_load( PFR_PhyFont phy_font, FT_Stream stream, FT_UInt32 offset, FT_UInt32 size ) { FT_Error error; FT_Memory memory = stream->memory; FT_UInt flags, num_aux; FT_Byte* p; FT_Byte* limit; phy_font->memory = memory; phy_font->offset = offset; phy_font->kern_items = NULL; phy_font->kern_items_tail = &phy_font->kern_items; if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( size ) ) goto Exit; phy_font->cursor = stream->cursor; p = stream->cursor; limit = p + size; PFR_CHECK( 15 ); phy_font->font_ref_number = PFR_NEXT_USHORT( p ); phy_font->outline_resolution = PFR_NEXT_USHORT( p ); phy_font->metrics_resolution = PFR_NEXT_USHORT( p ); phy_font->bbox.xMin = PFR_NEXT_SHORT( p ); phy_font->bbox.yMin = PFR_NEXT_SHORT( p ); phy_font->bbox.xMax = PFR_NEXT_SHORT( p ); phy_font->bbox.yMax = PFR_NEXT_SHORT( p ); phy_font->flags = flags = PFR_NEXT_BYTE( p ); /* get the standard advance for non-proprotional fonts */ if ( !(flags & PFR_PHY_PROPORTIONAL) ) { PFR_CHECK( 2 ); phy_font->standard_advance = PFR_NEXT_SHORT( p ); } /* load the extra items when present */ if ( flags & PFR_PHY_EXTRA_ITEMS ) { error = pfr_extra_items_parse( &p, limit, pfr_phy_font_extra_items, phy_font ); if ( error ) goto Fail; } /* In certain fonts, the auxiliary bytes contain interesting */ /* information. These are not in the specification but can be */ /* guessed by looking at the content of a few PFR0 fonts. */ PFR_CHECK( 3 ); num_aux = PFR_NEXT_ULONG( p ); if ( num_aux > 0 ) { FT_Byte* q = p; FT_Byte* q2; PFR_CHECK( num_aux ); p += num_aux; while ( num_aux > 0 ) { FT_UInt length, type; if ( q + 4 > p ) break; length = PFR_NEXT_USHORT( q ); if ( length < 4 || length > num_aux ) break; q2 = q + length - 2; type = PFR_NEXT_USHORT( q ); switch ( type ) { case 1: /* this seems to correspond to the font's family name, * padded to 16-bits with one zero when necessary */ error = pfr_aux_name_load( q, length - 4U, memory, &phy_font->family_name ); if ( error ) goto Exit; break; case 2: if ( q + 32 > q2 ) break; q += 10; phy_font->ascent = PFR_NEXT_SHORT( q ); phy_font->descent = PFR_NEXT_SHORT( q ); phy_font->leading = PFR_NEXT_SHORT( q ); q += 16; break; case 3: /* this seems to correspond to the font's style name, * padded to 16-bits with one zero when necessary */ error = pfr_aux_name_load( q, length - 4U, memory, &phy_font->style_name ); if ( error ) goto Exit; break; default: ; } q = q2; num_aux -= length; } } /* read the blue values */ { FT_UInt n, count; PFR_CHECK( 1 ); phy_font->num_blue_values = count = PFR_NEXT_BYTE( p ); PFR_CHECK( count * 2 ); if ( FT_NEW_ARRAY( phy_font->blue_values, count ) ) goto Fail; for ( n = 0; n < count; n++ ) phy_font->blue_values[n] = PFR_NEXT_SHORT( p ); } PFR_CHECK( 8 ); phy_font->blue_fuzz = PFR_NEXT_BYTE( p ); phy_font->blue_scale = PFR_NEXT_BYTE( p ); phy_font->vertical.standard = PFR_NEXT_USHORT( p ); phy_font->horizontal.standard = PFR_NEXT_USHORT( p ); /* read the character descriptors */ { FT_UInt n, count, Size; phy_font->num_chars = count = PFR_NEXT_USHORT( p ); phy_font->chars_offset = offset + ( p - stream->cursor ); if ( FT_NEW_ARRAY( phy_font->chars, count ) ) goto Fail; Size = 1 + 1 + 2; if ( flags & PFR_PHY_2BYTE_CHARCODE ) Size += 1; if ( flags & PFR_PHY_PROPORTIONAL ) Size += 2; if ( flags & PFR_PHY_ASCII_CODE ) Size += 1; if ( flags & PFR_PHY_2BYTE_GPS_SIZE ) Size += 1; if ( flags & PFR_PHY_3BYTE_GPS_OFFSET ) Size += 1; PFR_CHECK( count * Size ); for ( n = 0; n < count; n++ ) { PFR_Char cur = &phy_font->chars[n]; cur->char_code = ( flags & PFR_PHY_2BYTE_CHARCODE ) ? PFR_NEXT_USHORT( p ) : PFR_NEXT_BYTE( p ); cur->advance = ( flags & PFR_PHY_PROPORTIONAL ) ? PFR_NEXT_SHORT( p ) : (FT_Int) phy_font->standard_advance; #if 0 cur->ascii = ( flags & PFR_PHY_ASCII_CODE ) ? PFR_NEXT_BYTE( p ) : 0; #else if ( flags & PFR_PHY_ASCII_CODE ) p += 1; #endif cur->gps_size = ( flags & PFR_PHY_2BYTE_GPS_SIZE ) ? PFR_NEXT_USHORT( p ) : PFR_NEXT_BYTE( p ); cur->gps_offset = ( flags & PFR_PHY_3BYTE_GPS_OFFSET ) ? PFR_NEXT_ULONG( p ) : PFR_NEXT_USHORT( p ); } } /* that's it! */ Fail: FT_FRAME_EXIT(); /* save position of bitmap info */ phy_font->bct_offset = FT_STREAM_POS(); phy_font->cursor = NULL; Exit: return error; Too_Short: error = PFR_Err_Invalid_Table; FT_ERROR(( "pfr_phy_font_load: invalid physical font table\n" )); goto Fail; } /* END */