/**************************************************************************** * * pfrload.c * * FreeType PFR loader (body). * * Copyright (C) 2002-2023 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 <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include "pfrerror.h" #undef FT_COMPONENT #define FT_COMPONENT … /* * The overall structure of a PFR file is as follows. * * PFR header * 58 bytes (contains nPhysFonts) * * Logical font directory (size at most 2^16 bytes) * 2 bytes (nLogFonts) * + nLogFonts * 5 bytes * * ==> nLogFonts <= 13106 * * Logical font section (size at most 2^24 bytes) * nLogFonts * logFontRecord * * logFontRecord (size at most 2^16 bytes) * 12 bytes (fontMatrix) * + 1 byte (flags) * + 0-5 bytes (depending on `flags') * + 0-(1+255*(2+255)) = 0-65536 (depending on `flags') * + 5 bytes (physical font info) * + 0-1 bytes (depending on PFR header) * * ==> minimum size 18 bytes * * Physical font section (size at most 2^24 bytes) * nPhysFonts * (physFontRecord * + nBitmapSizes * nBmapChars * bmapCharRecord) * * physFontRecord (size at most 2^24 bytes) * 14 bytes (font info) * + 1 byte (flags) * + 0-2 (depending on `flags') * + 0-? (structure too complicated to be shown here; depending on * `flags'; contains `nBitmapSizes' and `nBmapChars') * + 3 bytes (nAuxBytes) * + nAuxBytes * + 1 byte (nBlueValues) * + 2 * nBlueValues * + 6 bytes (hinting data) * + 2 bytes (nCharacters) * + nCharacters * (4-10 bytes) (depending on `flags') * * ==> minimum size 27 bytes * * bmapCharRecord * 4-7 bytes * * Glyph program strings (three possible types: simpleGps, compoundGps, * and bitmapGps; size at most 2^24 bytes) * simpleGps (size at most 2^16 bytes) * 1 byte (flags) * 1-2 bytes (n[XY]orus, depending on `flags') * 0-(64+512*2) = 0-1088 bytes (depending on `n[XY]orus') * 0-? (structure too complicated to be shown here; depending on * `flags') * 1-? glyph data (faintly resembling PS Type 1 charstrings) * * ==> minimum size 3 bytes * * compoundGps (size at most 2^16 bytes) * 1 byte (nElements <= 63, flags) * + 0-(1+255*(2+255)) = 0-65536 (depending on `flags') * + nElements * (6-14 bytes) * * bitmapGps (size at most 2^16 bytes) * 1 byte (flags) * 3-13 bytes (position info, depending on `flags') * 0-? bitmap data * * ==> minimum size 4 bytes * * PFR trailer * 8 bytes * * * ==> minimum size of a valid PFR: * 58 (header) * + 2 (nLogFonts) * + 27 (1 physFontRecord) * + 8 (trailer) * ----- * 95 bytes * */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** EXTRA ITEMS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_extra_items_skip( FT_Byte* *pp, FT_Byte* limit ) { … } FT_LOCAL_DEF( FT_Error ) pfr_extra_items_parse( FT_Byte* *pp, FT_Byte* limit, PFR_ExtraItem item_list, FT_Pointer item_data ) { … } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** PFR HEADER *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static const FT_Frame_Field pfr_header_fields[] = …; FT_LOCAL_DEF( FT_Error ) pfr_header_load( PFR_Header header, FT_Stream stream ) { … } FT_LOCAL_DEF( FT_Bool ) pfr_header_check( PFR_Header header ) { … } /***********************************************************************/ /***********************************************************************/ /***** *****/ /***** PFR LOGICAL FONTS *****/ /***** *****/ /***********************************************************************/ /***********************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_log_font_count( FT_Stream stream, FT_UInt32 section_offset, FT_Long *acount ) { … } 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 ) { … } /***********************************************************************/ /***********************************************************************/ /***** *****/ /***** PFR PHYSICAL FONTS *****/ /***** *****/ /***********************************************************************/ /***********************************************************************/ /* load bitmap strikes lists */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_bitmap_info( FT_Byte* p, FT_Byte* limit, void* phy_font_ ) { … } /* 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, void* phy_font_ ) { … } /* load stem snap tables */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_stem_snaps( FT_Byte* p, FT_Byte* limit, void* phy_font_ ) { … } /* load kerning pair data */ FT_CALLBACK_DEF( FT_Error ) pfr_extra_item_load_kerning_pairs( FT_Byte* p, FT_Byte* limit, void* phy_font_ ) { … } static const PFR_ExtraItemRec pfr_phy_font_extra_items[] = …; /* * Load 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_LOCAL_DEF( void ) pfr_phy_font_done( PFR_PhyFont phy_font, FT_Memory memory ) { … } FT_LOCAL_DEF( FT_Error ) pfr_phy_font_load( PFR_PhyFont phy_font, FT_Stream stream, FT_UInt32 offset, FT_UInt32 size ) { … } /* END */
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