Commit d464139d authored by Werner Lemberg's avatar Werner Lemberg
Browse files

Initial revision

parent 7110f214
/***************************************************************************/
/* */
/* ftlzw.c */
/* */
/* FreeType support for .Z compressed files. */
/* */
/* This optional component relies on NetBSD's zopen(). It should mainly */
/* be used to parse compressed PCF fonts, as found with many X11 server */
/* distributions. */
/* */
/* Copyright 2004 by */
/* Albert Chin-A-Young. */
/* */
/* Based on code in src/gzip/ftgzip.c, Copyright 2004 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>
#include <stdio.h>
#include "zopen.h"
#include FT_MODULE_ERRORS_H
#undef __FTERRORS_H__
#define FT_ERR_PREFIX LZW_Err_
#define FT_ERR_BASE FT_Mod_Err_LZW
#include FT_ERRORS_H
#ifdef FT_CONFIG_OPTION_USE_LZW
/***************************************************************************/
/***************************************************************************/
/***** *****/
/***** M E M O R Y M A N A G E M E N T *****/
/***** *****/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***** *****/
/***** F I L E D E S C R I P T O R *****/
/***** *****/
/***************************************************************************/
/***************************************************************************/
#define FT_LZW_BUFFER_SIZE 4096
typedef struct FT_LZWFileRec_
{
FT_Stream source; /* parent/source stream */
FT_Stream stream; /* embedding stream */
FT_Memory memory; /* memory allocator */
s_zstate_t zstream; /* lzw input stream */
FT_ULong start; /* starting position, after .Z header */
FT_Byte input[FT_LZW_BUFFER_SIZE]; /* input buffer */
FT_Byte buffer[FT_LZW_BUFFER_SIZE]; /* output buffer */
FT_ULong pos; /* position in output */
FT_Byte* cursor;
FT_Byte* limit;
} FT_LZWFileRec, *FT_LZWFile;
/* check and skip .Z header */
static FT_Error
ft_lzw_check_header( FT_Stream stream )
{
FT_Error error;
FT_Byte head[2];
if ( FT_STREAM_SEEK( 0 ) ||
FT_STREAM_READ( head, 2 ) )
goto Exit;
/* head[0] && head[1] are the magic numbers */
if ( head[0] != 0x1f ||
head[1] != 0x9d )
error = LZW_Err_Invalid_File_Format;
Exit:
return error;
}
static FT_Error
ft_lzw_file_init( FT_LZWFile zip,
FT_Stream stream,
FT_Stream source )
{
s_zstate_t* zstream = &zip->zstream;
FT_Error error = LZW_Err_Ok;
zip->stream = stream;
zip->source = source;
zip->memory = stream->memory;
zip->limit = zip->buffer + FT_LZW_BUFFER_SIZE;
zip->cursor = zip->limit;
zip->pos = 0;
/* check and skip .Z header */
{
stream = source;
error = ft_lzw_check_header( source );
if ( error )
goto Exit;
zip->start = FT_STREAM_POS();
}
/* initialize internal lzw variable */
zinit( zstream );
zstream->avail_in = 0;
zstream->next_in = zip->buffer;
zstream->zs_in_count = source->size - 2;
if ( zstream->next_in == NULL )
error = LZW_Err_Invalid_File_Format;
Exit:
return error;
}
static void
ft_lzw_file_done( FT_LZWFile zip )
{
s_zstate_t* zstream = &zip->zstream;
/* clear the rest */
zstream->next_in = NULL;
zstream->next_out = NULL;
zstream->avail_in = 0;
zstream->avail_out = 0;
zstream->total_in = 0;
zstream->total_out = 0;
zip->memory = NULL;
zip->source = NULL;
zip->stream = NULL;
}
static FT_Error
ft_lzw_file_reset( FT_LZWFile zip )
{
FT_Stream stream = zip->source;
FT_Error error;
if ( !FT_STREAM_SEEK( zip->start ) )
{
s_zstate_t* zstream = &zip->zstream;
zinit( zstream );
zstream->avail_in = 0;
zstream->next_in = zip->input;
zstream->total_in = 0;
zstream->avail_out = 0;
zstream->next_out = zip->buffer;
zstream->total_out = 0;
zstream->zs_in_count = zip->source->size - 2;
zip->limit = zip->buffer + FT_LZW_BUFFER_SIZE;
zip->cursor = zip->limit;
zip->pos = 0;
}
return error;
}
static FT_Error
ft_lzw_file_fill_input( FT_LZWFile zip )
{
s_zstate_t* zstream = &zip->zstream;
FT_Stream stream = zip->source;
FT_ULong size;
if ( stream->read )
{
size = stream->read( stream, stream->pos, zip->input,
FT_LZW_BUFFER_SIZE );
if ( size == 0 )
return LZW_Err_Invalid_Stream_Operation;
}
else
{
size = stream->size - stream->pos;
if ( size > FT_LZW_BUFFER_SIZE )
size = FT_LZW_BUFFER_SIZE;
if ( size == 0 )
return LZW_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 LZW_Err_Ok;
}
static FT_Error
ft_lzw_file_fill_output( FT_LZWFile zip )
{
s_zstate_t* zstream = &zip->zstream;
FT_Error error = 0;
zip->cursor = zip->buffer;
zstream->next_out = zip->cursor;
zstream->avail_out = FT_LZW_BUFFER_SIZE;
while ( zstream->avail_out > 0 )
{
int num_read = 0;
if ( zstream->avail_in == 0 )
{
error = ft_lzw_file_fill_input( zip );
if ( error )
break;
}
num_read = zread( zstream );
if ( num_read == -1 && zstream->zs_in_count == 0 )
{
zip->limit = zstream->next_out;
if ( zip->limit == zip->cursor )
error = LZW_Err_Invalid_Stream_Operation;
break;
}
else if ( num_read == -1 )
break;
else
zstream->avail_out -= num_read;
}
return error;
}
/* fill output buffer; `count' must be <= FT_LZW_BUFFER_SIZE */
static FT_Error
ft_lzw_file_skip_output( FT_LZWFile zip,
FT_ULong count )
{
FT_Error error = LZW_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_lzw_file_fill_output( zip );
if ( error )
break;
}
return error;
}
static FT_ULong
ft_lzw_file_io( FT_LZWFile zip,
FT_ULong pos,
FT_Byte* buffer,
FT_ULong count )
{
FT_ULong result = 0;
FT_Error error;
/* Teset inflate stream if we're seeking backwards. */
/* Yes, that is not too efficient, but it saves memory :-) */
if ( pos < zip->pos )
{
error = ft_lzw_file_reset( zip );
if ( error )
goto Exit;
}
/* skip unwanted bytes */
if ( pos > zip->pos )
{
error = ft_lzw_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_lzw_file_fill_output( zip );
if ( error )
break;
}
Exit:
return result;
}
/***************************************************************************/
/***************************************************************************/
/***** *****/
/***** L Z W E M B E D D I N G S T R E A M *****/
/***** *****/
/***************************************************************************/
/***************************************************************************/
static void
ft_lzw_stream_close( FT_Stream stream )
{
FT_LZWFile zip = (FT_LZWFile)stream->descriptor.pointer;
FT_Memory memory = stream->memory;
if ( zip )
{
/* finalize lzw file descriptor */
ft_lzw_file_done( zip );
FT_FREE( zip );
stream->descriptor.pointer = NULL;
}
}
static FT_ULong
ft_lzw_stream_io( FT_Stream stream,
FT_ULong pos,
FT_Byte* buffer,
FT_ULong count )
{
FT_LZWFile zip = (FT_LZWFile)stream->descriptor.pointer;
return ft_lzw_file_io( zip, pos, buffer, count );
}
FT_EXPORT_DEF( FT_Error )
FT_Stream_OpenLZW( FT_Stream stream,
FT_Stream source )
{
FT_Error error;
FT_Memory memory = source->memory;
FT_LZWFile zip;
FT_ZERO( stream );
stream->memory = memory;
if ( !FT_NEW( zip ) )
{
error = ft_lzw_file_init( zip, stream, source );
if ( error )
{
FT_FREE( zip );
goto Exit;
}
stream->descriptor.pointer = zip;
}
stream->size = 0x7FFFFFFFL; /* don't know the real size! */
stream->pos = 0;
stream->base = 0;
stream->read = ft_lzw_stream_io;
stream->close = ft_lzw_stream_close;
Exit:
return error;
}
#include "zopen.c"
#else /* !FT_CONFIG_OPTION_USE_LZW */
FT_EXPORT_DEF( FT_Error )
FT_Stream_OpenLZW( FT_Stream stream,
FT_Stream source )
{
FT_UNUSED( stream );
FT_UNUSED( source );
return LZW_Err_Unimplemented_Feature;
}
#endif /* !FT_CONFIG_OPTION_USE_LZW */
/* END */
#
# FreeType 2 LZW support configuration rules
#
# Copyright 2004 by
# Albert Chin-A-Young.
#
# Based on src/lzw/rules.mk, 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.
# LZW driver directory
#
LZW_DIR := $(SRC_DIR)/lzw
# compilation flags for the driver
#
LZW_COMPILE := $(FT_COMPILE) $I$(subst /,$(COMPILER_SEP),$(LZW_DIR))
# LZW support sources (i.e., C files)
#
LZW_DRV_SRC := $(LZW_DIR)/ftlzw.c \
$(LZW_DIR)/zopen.c
# LZW support headers
#
LZW_DRV_H := $(LZW_DIR)/zopen.h
# LZW driver object(s)
#
# LZW_DRV_OBJ_M is used during `multi' builds
# LZW_DRV_OBJ_S is used during `single' builds
#
LZW_DRV_OBJ_M := $(OBJ_DIR)/ftlzw.$O
LZW_DRV_OBJ_S := $(OBJ_DIR)/ftlzw.$O
# LZW support source file for single build
#
LZW_DRV_SRC_S := $(LZW_DIR)/ftlzw.c
# LZW support - single object
#
$(LZW_DRV_OBJ_S): $(LZW_DRV_SRC_S) $(LZW_DRV_SRC) $(FREETYPE_H) $(LZW_DRV_H)
$(LZW_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $(LZW_DRV_SRC_S))
# LZW support - multiple objects
#
$(OBJ_DIR)/%.$O: $(LZW_DIR)/%.c $(FREETYPE_H) $(LZW_DRV_H)
$(LZW_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $<)
# update main driver object lists
#
DRV_OBJS_S += $(LZW_DRV_OBJ_S)
DRV_OBJS_M += $(LZW_DRV_OBJ_M)
# EOF
<
/* $NetBSD: zopen.c,v 1.8 2003/08/07 11:13:29 agc Exp $ */
/*-
* Copyright (c) 1985, 1986, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Diomidis Spinellis and James A. Woods, derived from original
* work by Spencer Thomas and Joseph Orost.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*-
*
* Copyright (c) 2004
* Albert Chin-A-Young.
*
* Modified to work with FreeType's PCF driver.
*
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)zopen.c 8.1 (Berkeley) 6/27/93";
#else
static char rcsid[] = "$NetBSD: zopen.c,v 1.8 2003/08/07 11:13:29 agc Exp $";
#endif
#endif /* LIBC_SCCS and not lint */
/*-
* fcompress.c - File compression ala IEEE Computer, June 1984.
*
* Compress authors:
* Spencer W. Thomas (decvax!utah-cs!thomas)
* Jim McKie (decvax!mcvax!jim)
* Steve Davies (decvax!vax135!petsd!peora!srd)
* Ken Turkowski (decvax!decwrl!turtlevax!ken)
* James A. Woods (decvax!ihnp4!ames!jaw)
* Joe Orost (decvax!vax135!petsd!joe)
*
* Cleaned up and converted to library returning I/O streams by
* Diomidis Spinellis <dds@doc.ic.ac.uk>.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if 0
static char_type magic_header[] =
{ 0x1f, 0x9d }; /* 1F 9D */
#endif
#define BIT_MASK 0x1f /* Defines for third byte of header. */
#define BLOCK_MASK 0x80
/*
* Masks 0x40 and 0x20 are free. I think 0x20 should mean that there is
* a fourth header byte (for expansion).
*/
#define INIT_BITS 9 /* Initial number of bits/code. */
#define MAXCODE(n_bits) ((1 << (n_bits)) - 1)
/* Definitions to retain old variable names */
#define fp zs->zs_fp
#define state zs->zs_state
#define n_bits zs->zs_n_bits
#define maxbits zs->zs_maxbits
#define maxcode zs->zs_maxcode
#define maxmaxcode zs->zs_maxmaxcode
#define htab zs->zs_htab
#define codetab zs->zs_codetab
#define hsize zs->zs_hsize
#define free_ent zs->zs_free_ent
#define block_compress zs->zs_block_compress
#define clear_flg zs->zs_clear_flg
#define offset zs->zs_offset
#define in_count zs->zs_in_count
#define buf_len zs->zs_buf_len
#define buf zs->zs_buf
#define stackp zs->u.r.zs_stackp