/**************************************************************************** * * ttload.c * * Load the basic TrueType tables, i.e., tables that can be either in * TTF or OTF fonts (body). * * Copyright (C) 1996-2023 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 <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/tttags.h> #include "ttload.h" #include "sferrors.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 … /************************************************************************** * * @Function: * tt_face_lookup_table * * @Description: * Looks for a TrueType table by name. * * @Input: * face :: * A face object handle. * * tag :: * The searched tag. * * @Return: * A pointer to the table directory entry. 0 if not found. */ FT_LOCAL_DEF( TT_Table ) tt_face_lookup_table( TT_Face face, FT_ULong tag ) { … } /************************************************************************** * * @Function: * tt_face_goto_table * * @Description: * Looks for a TrueType table by name, then seek a stream to it. * * @Input: * face :: * A face object handle. * * tag :: * The searched tag. * * stream :: * The stream to seek when the table is found. * * @Output: * length :: * The length of the table if found, undefined otherwise. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_goto_table( TT_Face face, FT_ULong tag, FT_Stream stream, FT_ULong* length ) { … } /* Here, we */ /* */ /* - check that `num_tables' is valid (and adjust it if necessary); */ /* also return the number of valid table entries */ /* */ /* - look for a `head' table, check its size, and parse it to check */ /* whether its `magic' field is correctly set */ /* */ /* - errors (except errors returned by stream handling) */ /* */ /* SFNT_Err_Unknown_File_Format: */ /* no table is defined in directory, it is not sfnt-wrapped */ /* data */ /* SFNT_Err_Table_Missing: */ /* table directory is valid, but essential tables */ /* (head/bhed/SING) are missing */ /* */ static FT_Error check_table_dir( SFNT_Header sfnt, FT_Stream stream, FT_UShort* valid ) { … } /************************************************************************** * * @Function: * tt_face_load_font_dir * * @Description: * Loads the header of a SFNT font file. * * @Input: * face :: * A handle to the target face object. * * stream :: * The input stream. * * @Output: * sfnt :: * The SFNT header. * * @Return: * FreeType error code. 0 means success. * * @Note: * The stream cursor must be at the beginning of the font directory. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_font_dir( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_any * * @Description: * Loads any font table into client memory. * * @Input: * face :: * The face object to look for. * * tag :: * The tag of table to load. Use the value 0 if you want * to access the whole font file, else set this parameter * to a valid TrueType table tag that you can forge with * the MAKE_TT_TAG macro. * * offset :: * The starting offset in the table (or the file if * tag == 0). * * length :: * The address of the decision variable: * * If length == NULL: * Loads the whole table. Returns an error if * `offset' == 0! * * If *length == 0: * Exits immediately; returning the length of the given * table or of the font file, depending on the value of * `tag'. * * If *length != 0: * Loads the next `length' bytes of table or font, * starting at offset `offset' (in table or font too). * * @Output: * buffer :: * The address of target buffer. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_any( TT_Face face, FT_ULong tag, FT_Long offset, FT_Byte* buffer, FT_ULong* length ) { … } /************************************************************************** * * @Function: * tt_face_load_generic_header * * @Description: * Loads the TrueType table `head' or `bhed'. * * @Input: * face :: * A handle to the target face object. * * stream :: * The input stream. * * @Return: * FreeType error code. 0 means success. */ static FT_Error tt_face_load_generic_header( TT_Face face, FT_Stream stream, FT_ULong tag ) { … } FT_LOCAL_DEF( FT_Error ) tt_face_load_head( TT_Face face, FT_Stream stream ) { … } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_LOCAL_DEF( FT_Error ) tt_face_load_bhed( TT_Face face, FT_Stream stream ) { … } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /************************************************************************** * * @Function: * tt_face_load_maxp * * @Description: * Loads the maximum profile into a face object. * * @Input: * face :: * A handle to the target face object. * * stream :: * The input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_maxp( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_name * * @Description: * Loads the name records. * * @Input: * face :: * A handle to the target face object. * * stream :: * The input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_name( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_free_name * * @Description: * Frees the name records. * * @Input: * face :: * A handle to the target face object. */ FT_LOCAL_DEF( void ) tt_face_free_name( TT_Face face ) { … } /************************************************************************** * * @Function: * tt_face_load_cmap * * @Description: * Loads the cmap directory in a face object. The cmaps themselves * are loaded on demand in the `ttcmap.c' module. * * @Input: * face :: * A handle to the target face object. * * stream :: * A handle to the input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_cmap( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_os2 * * @Description: * Loads the OS2 table. * * @Input: * face :: * A handle to the target face object. * * stream :: * A handle to the input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_os2( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_postscript * * @Description: * Loads the Postscript table. * * @Input: * face :: * A handle to the target face object. * * stream :: * A handle to the input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_post( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_pclt * * @Description: * Loads the PCL 5 Table. * * @Input: * face :: * A handle to the target face object. * * stream :: * A handle to the input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_pclt( TT_Face face, FT_Stream stream ) { … } /************************************************************************** * * @Function: * tt_face_load_gasp * * @Description: * Loads the `gasp' table into a face object. * * @Input: * face :: * A handle to the target face object. * * stream :: * The input stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) tt_face_load_gasp( TT_Face face, FT_Stream stream ) { … } /* END */
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