static FT_Error
ft_lzw_file_init( FT_LZWFile zip,
FT_Stream stream,
FT_Stream source )
{
FT_LzwState lzw = &zip->lzw;
FT_Error error;
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 */
error = ft_lzw_check_header( source );
if ( error )
goto Exit;
/* initialize internal lzw variable */
ft_lzwstate_init( lzw, source );
Exit:
return error;
}
FT_Stream_OpenLZW( FT_Stream stream,
FT_Stream source )
{
FT_Error error;
FT_Memory memory;
FT_LZWFile zip = NULL;
if ( !stream || !source )
{
error = FT_THROW( Invalid_Stream_Handle );
goto Exit;
}
memory = source->memory;
/*
* Check the header right now; this prevents allocation of a huge
* LZWFile object (400 KByte of heap memory) if not necessary.
*
* Did I mention that you should never use .Z compressed font
* files?
*/
error = ft_lzw_check_header( source );
if ( error )
goto Exit;
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;
}
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;
}