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; }