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Diffstat (limited to 'nx-X11/extras/freetype2/src/lzw/ftlzw.c')
-rw-r--r--nx-X11/extras/freetype2/src/lzw/ftlzw.c463
1 files changed, 463 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/src/lzw/ftlzw.c b/nx-X11/extras/freetype2/src/lzw/ftlzw.c
new file mode 100644
index 000000000..a0e4cc576
--- /dev/null
+++ b/nx-X11/extras/freetype2/src/lzw/ftlzw.c
@@ -0,0 +1,463 @@
+/***************************************************************************/
+/* */
+/* 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 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
+
+#include "zopen.h"
+
+
+/***************************************************************************/
+/***************************************************************************/
+/***** *****/
+/***** 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 */
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