/**************************************************************************** * * ftgzip.c * * FreeType support for .gz compressed files. * * This optional component relies on zlib. It should mainly be used to * parse compressed PCF fonts, as found with many X11 server * distributions. * * 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 <freetype/internal/ftmemory.h> #include <freetype/internal/ftstream.h> #include <freetype/internal/ftdebug.h> #include <freetype/ftgzip.h> #include FT_CONFIG_STANDARD_LIBRARY_H #include <freetype/ftmoderr.h> #undef FTERRORS_H_ #undef FT_ERR_PREFIX #define FT_ERR_PREFIX … #define FT_ERR_BASE … #include <freetype/fterrors.h> #ifdef FT_CONFIG_OPTION_USE_ZLIB #ifdef FT_CONFIG_OPTION_SYSTEM_ZLIB #include <zlib.h> #else /* !FT_CONFIG_OPTION_SYSTEM_ZLIB */ /* In this case, we include our own modified sources of the ZLib */ /* within the `gzip' component. The modifications were necessary */ /* to #include all files without conflicts, as well as preventing */ /* the definition of `extern' functions that may cause linking */ /* conflicts when a program is linked with both FreeType and the */ /* original ZLib. */ #ifndef USE_ZLIB_ZCALLOC #define MY_ZCALLOC … #endif /* Note that our `zlib.h' includes `ftzconf.h' instead of `zconf.h'; */ /* the main reason is that even a global `zlib.h' includes `zconf.h' */ /* with */ /* */ /* #include "zconf.h" */ /* */ /* instead of the expected */ /* */ /* #include <zconf.h> */ /* */ /* so that configuration with `FT_CONFIG_OPTION_SYSTEM_ZLIB' might */ /* include the wrong `zconf.h' file, leading to errors. */ #define ZEXPORT /* prevent zlib functions from being visible outside their object files */ #define ZEXTERN … #define HAVE_MEMCPY … #define Z_SOLO … #define Z_FREETYPE … #if defined( _MSC_VER ) /* Visual C++ (and Intel C++) */ /* We disable the warning `conversion from XXX to YYY, */ /* possible loss of data' in order to compile cleanly with */ /* the maximum level of warnings: zlib is non-FreeType */ /* code. */ #pragma warning( push ) #pragma warning( disable : 4244 ) #endif /* _MSC_VER */ #if defined( __GNUC__ ) #pragma GCC diagnostic push #ifndef __cplusplus #pragma GCC diagnostic ignored "-Wstrict-prototypes" #endif #pragma GCC diagnostic ignored "-Wimplicit-fallthrough" #pragma GCC diagnostic ignored "-Wredundant-decls" #endif #include "zutil.c" #include "inffast.c" #include "inflate.c" #include "inftrees.c" #include "adler32.c" #include "crc32.c" #if defined( __GNUC__ ) #pragma GCC diagnostic pop #endif #if defined( _MSC_VER ) #pragma warning( pop ) #endif #endif /* !FT_CONFIG_OPTION_SYSTEM_ZLIB */ /***************************************************************************/ /***************************************************************************/ /***** *****/ /***** Z L I B M E M O R Y M A N A G E M E N T *****/ /***** *****/ /***************************************************************************/ /***************************************************************************/ /* it is better to use FreeType memory routines instead of raw 'malloc/free' */ static voidpf ft_gzip_alloc( voidpf opaque, uInt items, uInt size ) { … } static void ft_gzip_free( voidpf opaque, voidpf address ) { … } /***************************************************************************/ /***************************************************************************/ /***** *****/ /***** Z L I B F I L E D E S C R I P T O R *****/ /***** *****/ /***************************************************************************/ /***************************************************************************/ #define FT_GZIP_BUFFER_SIZE … FT_GZipFile; /* gzip flag byte */ #define FT_GZIP_ASCII_FLAG … #define FT_GZIP_HEAD_CRC … #define FT_GZIP_EXTRA_FIELD … #define FT_GZIP_ORIG_NAME … #define FT_GZIP_COMMENT … #define FT_GZIP_RESERVED … /* check and skip .gz header - we don't support `transparent' compression */ static FT_Error ft_gzip_check_header( FT_Stream stream ) { … } static FT_Error ft_gzip_file_init( FT_GZipFile zip, FT_Stream stream, FT_Stream source ) { … } static void ft_gzip_file_done( FT_GZipFile zip ) { … } static FT_Error ft_gzip_file_reset( FT_GZipFile zip ) { … } static FT_Error ft_gzip_file_fill_input( FT_GZipFile zip ) { … } static FT_Error ft_gzip_file_fill_output( FT_GZipFile zip ) { … } /* fill output buffer; `count' must be <= FT_GZIP_BUFFER_SIZE */ static FT_Error ft_gzip_file_skip_output( FT_GZipFile zip, FT_ULong count ) { … } static FT_ULong ft_gzip_file_io( FT_GZipFile zip, FT_ULong pos, FT_Byte* buffer, FT_ULong count ) { … } /***************************************************************************/ /***************************************************************************/ /***** *****/ /***** G Z E M B E D D I N G S T R E A M *****/ /***** *****/ /***************************************************************************/ /***************************************************************************/ static void ft_gzip_stream_close( FT_Stream stream ) { … } static unsigned long ft_gzip_stream_io( FT_Stream stream, unsigned long offset, unsigned char* buffer, unsigned long count ) { … } static FT_ULong ft_gzip_get_uncompressed_size( FT_Stream stream ) { … } /* documentation is in ftgzip.h */ FT_EXPORT_DEF( FT_Error ) FT_Stream_OpenGzip( FT_Stream stream, FT_Stream source ) { … } /* documentation is in ftgzip.h */ FT_EXPORT_DEF( FT_Error ) FT_Gzip_Uncompress( FT_Memory memory, FT_Byte* output, FT_ULong* output_len, const FT_Byte* input, FT_ULong input_len ) { … } #else /* !FT_CONFIG_OPTION_USE_ZLIB */ FT_EXPORT_DEF( FT_Error ) FT_Stream_OpenGzip( FT_Stream stream, FT_Stream source ) { FT_UNUSED( stream ); FT_UNUSED( source ); return FT_THROW( Unimplemented_Feature ); } FT_EXPORT_DEF( FT_Error ) FT_Gzip_Uncompress( FT_Memory memory, FT_Byte* output, FT_ULong* output_len, const FT_Byte* input, FT_ULong input_len ) { FT_UNUSED( memory ); FT_UNUSED( output ); FT_UNUSED( output_len ); FT_UNUSED( input ); FT_UNUSED( input_len ); return FT_THROW( Unimplemented_Feature ); } #endif /* !FT_CONFIG_OPTION_USE_ZLIB */ /* END */
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