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- /***************************************************************************/
- /* */
- /* ftgzip.c */
- /* */
- /* FreeType support for .gz compressed fileds */
- /* */
- /* this optional component relies on zlib. It should mainly be used to */
- /* parse compressed PCF fonts, as found with many X11 server */
- /* distributions. */
- /* */
- /* Copyright 2002 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 <ft2build.h>
- #include FT_INTERNAL_MEMORY_H
- #include FT_INTERNAL_STREAM_H
- #include FT_INTERNAL_DEBUG_H
- #include <string.h>
- #ifdef FT_CONFIG_OPTION_USE_ZLIB
- #ifdef FT_CONFIG_OPTION_SYSTEM_ZLIB
- # include "zlib.h"
- #else /* !SYSTEM_ZLIB */
- /* in this case, we include our own modified sources of the ZLib */
- /* within the "ftgzip" 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 */
- # define NO_DUMMY_DECL
- # define BUILDFIXED /* save code size */
- # define MY_ZCALLOC
- # include "zlib.h"
- # undef SLOW
- # define SLOW 1 /* we can't use asm-optimized sources here !! */
- # include "zutil.c"
- # include "inftrees.c"
- # include "infcodes.c"
- # include "infutil.c"
- # include "infblock.c"
- # include "inflate.c"
- # include "adler32.c"
- #endif /* !SYSTEM_ZLIB */
- /***************************************************************************/
- /***************************************************************************/
- /***** *****/
- /***** Z L I B M E M O R Y M A N A G E M E N T *****/
- /***** *****/
- /***************************************************************************/
- /***************************************************************************/
- /* it's better to use FreeType memory routines instead of raw 'malloc/free' */
- static voidpf
- ft_gzip_alloc( FT_Memory memory,
- uInt items,
- uInt size )
- {
- FT_ULong sz = (FT_ULong)size * items;
- FT_Pointer p;
- FT_MEM_ALLOC( p, sz );
- return (voidpf) p;
- }
- static void
- ft_gzip_free( FT_Memory memory,
- voidpf address )
- {
- FT_MEM_FREE( address );
- }
- #ifndef FT_CONFIG_OPTION_SYSTEM_ZLIB
- local voidpf
- zcalloc (opaque, items, size)
- voidpf opaque;
- unsigned items;
- unsigned size;
- {
- return ft_gzip_alloc( opaque, items, size );
- }
- local void
- zcfree( voidpf opaque,
- voidpf ptr )
- {
- ft_gzip_free( opaque, ptr );
- }
- #endif /* !SYSTEM_ZLIB */
- /***************************************************************************/
- /***************************************************************************/
- /***** *****/
- /***** Z L I B F I L E D E S C R I P T O R *****/
- /***** *****/
- /***************************************************************************/
- /***************************************************************************/
- #define FT_GZIP_BUFFER_SIZE 4096
- typedef struct FT_GZipFileRec_
- {
- FT_Stream source; /* parent/source stream */
- FT_Stream stream; /* embedding stream */
- FT_Memory memory; /* memory allocator */
- z_stream zstream; /* zlib input stream */
- FT_ULong start; /* starting position, after .gz header */
- FT_Byte input[ FT_GZIP_BUFFER_SIZE ]; /* input read buffer */
- FT_Byte buffer[ FT_GZIP_BUFFER_SIZE ]; /* output buffer */
- FT_ULong pos; /* position in output */
- FT_Byte* cursor;
- FT_Byte* limit;
- } FT_GZipFileRec, *FT_GZipFile;
- /* gzip flag byte */
- #define FT_GZIP_ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
- #define FT_GZIP_HEAD_CRC 0x02 /* bit 1 set: header CRC present */
- #define FT_GZIP_EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
- #define FT_GZIP_ORIG_NAME 0x08 /* bit 3 set: original file name present */
- #define FT_GZIP_COMMENT 0x10 /* bit 4 set: file comment present */
- #define FT_GZIP_RESERVED 0xE0 /* bits 5..7: reserved */
- /* check and skip .gz header - we don't support "transparent" compression */
- static FT_Error
- ft_gzip_check_header( FT_Stream stream )
- {
- FT_Error error;
- FT_Byte head[4];
- if ( FT_STREAM_SEEK( 0 ) ||
- FT_STREAM_READ( head, 4 ) )
- goto Exit;
- /* head[0] && head[1] are the magic numbers */
- /* head[2] is the method, and head[3] the flags */
- if ( head[0] != 0x1f ||
- head[1] != 0x8b ||
- head[2] != Z_DEFLATED ||
- (head[3] & FT_GZIP_RESERVED) )
- {
- error = FT_Err_Invalid_File_Format;
- goto Exit;
- }
- /* skip time, xflags and os code */
- (void)FT_STREAM_SKIP( 6 );
- /* skip the extra field */
- if ( head[3] && FT_GZIP_EXTRA_FIELD )
- {
- FT_UInt len;
- if ( FT_READ_USHORT_LE( len ) ||
- FT_STREAM_SKIP( len ) )
- goto Exit;
- }
- /* skip original file name */
- if ( head[3] && FT_GZIP_ORIG_NAME )
- for (;;)
- {
- FT_UInt c;
- if ( FT_READ_BYTE( c) )
- goto Exit;
- if ( c == 0 )
- break;
- }
- /* skip .gz comment */
- if ( head[3] & FT_GZIP_COMMENT )
- for (;;)
- {
- FT_UInt c;
- if ( FT_READ_BYTE( c) )
- goto Exit;
- if ( c == 0 )
- break;
- }
- /* skip CRC */
- if ( head[3] & FT_GZIP_HEAD_CRC )
- if ( FT_STREAM_SKIP( 2 ) )
- goto Exit;
- Exit:
- return error;
- }
- static FT_Error
- ft_gzip_file_init( FT_GZipFile zip,
- FT_Stream stream,
- FT_Stream source )
- {
- z_stream* zstream = &zip->zstream;
- FT_Error error = 0;
- zip->stream = stream;
- zip->source = source;
- zip->memory = stream->memory;
- zip->limit = zip->buffer + FT_GZIP_BUFFER_SIZE;
- zip->cursor = zip->limit;
- zip->pos = 0;
- /* check and skip .gz header */
- {
- stream = source;
- error = ft_gzip_check_header( stream );
- if (error)
- goto Exit;
- zip->start = FT_STREAM_POS();
- }
- /* initialize zlib - there is no zlib header in the compressed stream */
- zstream->zalloc = (alloc_func) ft_gzip_alloc;
- zstream->zfree = (free_func) ft_gzip_free;
- zstream->opaque = stream->memory;
- zstream->avail_in = 0;
- zstream->next_in = zip->buffer;
- if ( inflateInit2( zstream, -MAX_WBITS ) != Z_OK ||
- zstream->next_in == NULL )
- {
- error = FT_Err_Invalid_File_Format;
- goto Exit;
- }
- Exit:
- return error;
- }
- static void
- ft_gzip_file_done( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
- /* clear the rest */
- zstream->zalloc = NULL;
- zstream->zfree = NULL;
- zstream->opaque = NULL;
- zstream->next_in = NULL;
- zstream->next_out = NULL;
- zstream->avail_in = 0;
- zstream->avail_out = 0;
- zip->memory = NULL;
- zip->source = NULL;
- zip->stream = NULL;
- }
- static FT_Error
- ft_gzip_file_reset( FT_GZipFile zip )
- {
- FT_Stream stream = zip->source;
- FT_Error error;
- if ( !FT_STREAM_SEEK( zip->start ) )
- {
- z_stream* zstream = &zip->zstream;
- inflateReset( zstream );
- zstream->avail_in = 0;
- zstream->next_in = zip->input;
- zstream->avail_out = 0;
- zstream->next_out = zip->buffer;
- zip->limit = zip->buffer + FT_GZIP_BUFFER_SIZE;
- zip->cursor = zip->limit;
- zip->pos = 0;
- }
- return error;
- }
- static FT_Error
- ft_gzip_file_fill_input( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
- FT_Stream stream = zip->source;
- FT_ULong size;
- if ( stream->read )
- {
- size = stream->read( stream, stream->pos, zip->input, FT_GZIP_BUFFER_SIZE );
- if ( size == 0 )
- return FT_Err_Invalid_Stream_Operation;
- }
- else
- {
- size = stream->size - stream->pos;
- if ( size > FT_GZIP_BUFFER_SIZE )
- size = FT_GZIP_BUFFER_SIZE;
- if ( size == 0 )
- return FT_Err_Invalid_Stream_Operation;
- FT_MEM_COPY( zip->input, stream->base + stream->pos, size );
- }
- stream->pos += size;
- zstream->next_in = zip->input;
- zstream->avail_in = size;
- return 0;
- }
- static FT_Error
- ft_gzip_file_fill_output( FT_GZipFile zip )
- {
- z_stream* zstream = &zip->zstream;
- FT_Error error = 0;
- zip->cursor = zip->buffer;
- zstream->next_out = zip->cursor;
- zstream->avail_out = FT_GZIP_BUFFER_SIZE;
- while ( zstream->avail_out > 0 )
- {
- int err;
- if ( zstream->avail_in == 0 )
- {
- error = ft_gzip_file_fill_input( zip );
- if ( error )
- break;
- }
- err = inflate( zstream, Z_NO_FLUSH );
- if ( err == Z_STREAM_END )
- {
- zip->limit = zstream->next_out;
- break;
- }
- else if ( err != Z_OK )
- {
- error = FT_Err_Invalid_Stream_Operation;
- break;
- }
- }
- return error;
- }
- /* fill output buffer, 'count' must be <= FT_GZIP_BUFFER_SIZE */
- static FT_Error
- ft_gzip_file_skip_output( FT_GZipFile zip,
- FT_ULong count )
- {
- FT_Error error = 0;
- FT_ULong delta;
- for (;;)
- {
- delta = (FT_ULong)( zip->limit - zip->cursor );
- if ( delta >= count )
- delta = count;
- zip->cursor += delta;
- zip->pos += delta;
- count -= delta;
- if ( count == 0 )
- break;
- error = ft_gzip_file_fill_output( zip );
- if ( error )
- break;
- }
- return error;
- }
- static FT_ULong
- ft_gzip_file_io( FT_GZipFile zip,
- FT_ULong pos,
- FT_Byte* buffer,
- FT_ULong count )
- {
- FT_ULong result = 0;
- FT_Error error;
- /* reset inflate stream if we're seeking backwards */
- /* yes, that's not too efficient, but it saves memory :-) */
- if ( pos < zip->pos )
- {
- error = ft_gzip_file_reset( zip );
- if ( error ) goto Exit;
- }
- /* skip unwanted bytes */
- if ( pos > zip->pos )
- {
- error = ft_gzip_file_skip_output( zip, (FT_ULong)( pos - zip->pos ) );
- if (error)
- goto Exit;
- }
- if ( count == 0 )
- goto Exit;
- /* now read the data */
- for (;;)
- {
- FT_ULong delta;
- delta = (FT_ULong)( zip->limit - zip->cursor );
- if ( delta >= count )
- delta = count;
- FT_MEM_COPY( buffer, zip->cursor, delta );
- buffer += delta;
- result += delta;
- zip->cursor += delta;
- zip->pos += delta;
- count -= delta;
- if ( count == 0 )
- break;
- error = ft_gzip_file_fill_output( zip );
- if (error)
- break;
- }
- Exit:
- return result;
- }
- /***************************************************************************/
- /***************************************************************************/
- /***** *****/
- /***** 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 )
- {
- FT_GZipFile zip = stream->descriptor.pointer;
- FT_Memory memory = stream->memory;
- if ( zip )
- {
- /* finalize gzip file descriptor */
- ft_gzip_file_done( zip );
- FT_FREE( zip );
- stream->descriptor.pointer = NULL;
- }
- }
- static FT_ULong
- ft_gzip_stream_io( FT_Stream stream,
- FT_ULong pos,
- FT_Byte* buffer,
- FT_ULong count )
- {
- FT_GZipFile zip = stream->descriptor.pointer;
- return ft_gzip_file_io( zip, pos, buffer, count );
- }
- FT_EXPORT_DEF( FT_Error )
- FT_Stream_OpenGzip( FT_Stream stream,
- FT_Stream source )
- {
- FT_Error error;
- FT_Memory memory = source->memory;
- FT_GZipFile zip;
- FT_ZERO( stream );
- stream->memory = memory;
- if ( !FT_NEW( zip ) )
- {
- error = ft_gzip_file_init( zip, stream, source );
- if ( error )
- {
- FT_FREE( zip );
- goto Exit;
- }
- stream->descriptor.pointer = zip;
- }
- stream->size = 0x7FFFFFFF; /* don't know the real size !! */
- stream->pos = 0;
- stream->base = 0;
- stream->read = ft_gzip_stream_io;
- stream->close = ft_gzip_stream_close;
- Exit:
- return error;
- }
- #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_Err_Unimplemented_Feature;
- }
- #endif /* !FT_CONFIG_OPTION_USE_ZLIB */
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