| /***************************************************************************/ |
| /* */ |
| /* 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 2002, 2003, 2004, 2005, 2006, 2009 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 FT_GZIP_H |
| #include FT_CONFIG_STANDARD_LIBRARY_H |
| |
| |
| #include FT_MODULE_ERRORS_H |
| |
| #undef __FTERRORS_H__ |
| |
| #define FT_ERR_PREFIX Gzip_Err_ |
| #define FT_ERR_BASE FT_Mod_Err_Gzip |
| |
| #include FT_ERRORS_H |
| |
| |
| #ifdef FT_CONFIG_OPTION_USE_ZLIB |
| |
| #ifdef FT_CONFIG_OPTION_PIC |
| #error "gzip code does not support PIC yet" |
| #endif |
| |
| #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 "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 MY_ZCALLOC |
| |
| #include "zlib.h" |
| |
| #undef SLOW |
| #define SLOW 1 /* we can't use asm-optimized sources here! */ |
| |
| /* Urgh. `inflate_mask' must not be declared twice -- C++ doesn't like |
| this. We temporarily disable it and load all necessary header files. */ |
| #define NO_INFLATE_MASK |
| #include "zutil.h" |
| #include "inftrees.h" |
| #include "infblock.h" |
| #include "infcodes.h" |
| #include "infutil.h" |
| #undef NO_INFLATE_MASK |
| |
| /* infutil.c must be included before infcodes.c */ |
| #include "zutil.c" |
| #include "inftrees.c" |
| #include "infutil.c" |
| #include "infcodes.c" |
| #include "infblock.c" |
| #include "inflate.c" |
| #include "adler32.c" |
| |
| #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( FT_Memory memory, |
| uInt items, |
| uInt size ) |
| { |
| FT_ULong sz = (FT_ULong)size * items; |
| FT_Error error; |
| FT_Pointer p; |
| |
| |
| (void)FT_ALLOC( p, sz ); |
| return p; |
| } |
| |
| |
| static void |
| ft_gzip_free( FT_Memory memory, |
| voidpf address ) |
| { |
| FT_MEM_FREE( address ); |
| } |
| |
| |
| #ifndef FT_CONFIG_OPTION_SYSTEM_ZLIB |
| |
| local voidpf |
| zcalloc ( voidpf opaque, |
| unsigned items, |
| unsigned size ) |
| { |
| return ft_gzip_alloc( (FT_Memory)opaque, items, size ); |
| } |
| |
| local void |
| zcfree( voidpf opaque, |
| voidpf ptr ) |
| { |
| ft_gzip_free( (FT_Memory)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 = Gzip_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 = Gzip_Err_Ok; |
| |
| |
| 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 = Gzip_Err_Invalid_File_Format; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static void |
| ft_gzip_file_done( FT_GZipFile zip ) |
| { |
| z_stream* zstream = &zip->zstream; |
| |
| |
| inflateEnd( 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 Gzip_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 Gzip_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 Gzip_Err_Ok; |
| } |
| |
| |
| 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; |
| if ( zip->limit == zip->cursor ) |
| error = Gzip_Err_Invalid_Stream_Operation; |
| break; |
| } |
| else if ( err != Z_OK ) |
| { |
| error = Gzip_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 = Gzip_Err_Ok; |
| 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 is 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 = (FT_GZipFile)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 = (FT_GZipFile)stream->descriptor.pointer; |
| |
| |
| return ft_gzip_file_io( zip, pos, buffer, count ); |
| } |
| |
| |
| static FT_ULong |
| ft_gzip_get_uncompressed_size( FT_Stream stream ) |
| { |
| FT_Error error; |
| FT_ULong old_pos; |
| FT_ULong result = 0; |
| |
| |
| old_pos = stream->pos; |
| if ( !FT_Stream_Seek( stream, stream->size - 4 ) ) |
| { |
| result = (FT_ULong)FT_Stream_ReadLong( stream, &error ); |
| if ( error ) |
| result = 0; |
| |
| (void)FT_Stream_Seek( stream, old_pos ); |
| } |
| |
| return result; |
| } |
| |
| |
| 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; |
| |
| |
| /* |
| * check the header right now; this prevents allocating un-necessary |
| * objects when we don't need them |
| */ |
| error = ft_gzip_check_header( source ); |
| if ( error ) |
| goto Exit; |
| |
| FT_ZERO( stream ); |
| stream->memory = memory; |
| |
| if ( !FT_QNEW( zip ) ) |
| { |
| error = ft_gzip_file_init( zip, stream, source ); |
| if ( error ) |
| { |
| FT_FREE( zip ); |
| goto Exit; |
| } |
| |
| stream->descriptor.pointer = zip; |
| } |
| |
| /* |
| * We use the following trick to try to dramatically improve the |
| * performance while dealing with small files. If the original stream |
| * size is less than a certain threshold, we try to load the whole font |
| * file into memory. This saves us from using the 32KB buffer needed |
| * to inflate the file, plus the two 4KB intermediate input/output |
| * buffers used in the `FT_GZipFile' structure. |
| */ |
| { |
| FT_ULong zip_size = ft_gzip_get_uncompressed_size( source ); |
| |
| |
| if ( zip_size != 0 && zip_size < 40 * 1024 ) |
| { |
| FT_Byte* zip_buff; |
| |
| |
| if ( !FT_ALLOC( zip_buff, zip_size ) ) |
| { |
| FT_ULong count; |
| |
| |
| count = ft_gzip_file_io( zip, 0, zip_buff, zip_size ); |
| if ( count == zip_size ) |
| { |
| ft_gzip_file_done( zip ); |
| FT_FREE( zip ); |
| |
| stream->descriptor.pointer = NULL; |
| |
| stream->size = zip_size; |
| stream->pos = 0; |
| stream->base = zip_buff; |
| stream->read = NULL; |
| stream->close = ft_gzip_stream_close; |
| |
| goto Exit; |
| } |
| |
| ft_gzip_file_io( zip, 0, NULL, 0 ); |
| FT_FREE( zip_buff ); |
| } |
| error = 0; |
| } |
| } |
| |
| stream->size = 0x7FFFFFFFL; /* 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 Gzip_Err_Unimplemented_Feature; |
| } |
| |
| #endif /* !FT_CONFIG_OPTION_USE_ZLIB */ |
| |
| |
| /* END */ |