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Diffstat (limited to 'src/gzip/ftgzip.c')
| -rw-r--r-- | src/gzip/ftgzip.c | 682 |
1 files changed, 0 insertions, 682 deletions
diff --git a/src/gzip/ftgzip.c b/src/gzip/ftgzip.c deleted file mode 100644 index af2022d..0000000 --- a/src/gzip/ftgzip.c +++ /dev/null @@ -1,682 +0,0 @@ -/***************************************************************************/ -/* */ -/* 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 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 <string.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_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; - - 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 */ |