144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_lzfcompress.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <unistd.h>
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#include <nuttx/streams.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lzfoutstream_flush
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****************************************************************************/
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static int lzfoutstream_flush(FAR struct lib_outstream_s *this)
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{
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FAR struct lib_lzfoutstream_s *stream =
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(FAR struct lib_lzfoutstream_s *)this;
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FAR struct lzf_header_s *header;
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size_t outlen;
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if (stream->offset > 0)
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{
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outlen = lzf_compress(stream->in, stream->offset,
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&stream->out[LZF_MAX_HDR_SIZE],
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stream->offset, stream->state, &header);
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if (outlen > 0)
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{
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stream->backend->puts(stream->backend, header, outlen);
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}
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stream->offset = 0;
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}
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return stream->backend->flush(stream->backend);
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}
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/****************************************************************************
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* Name: lzfoutstream_puts
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****************************************************************************/
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static int lzfoutstream_puts(FAR struct lib_outstream_s *this,
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FAR const void *buf, int len)
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{
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FAR struct lib_lzfoutstream_s *stream =
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(FAR struct lib_lzfoutstream_s *)this;
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FAR struct lzf_header_s *header;
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FAR const char *ptr = buf;
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size_t total = len;
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size_t copyin;
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size_t outlen;
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int ret;
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while (total > 0)
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{
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copyin = stream->offset + total > LZF_STREAM_BLOCKSIZE ?
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LZF_STREAM_BLOCKSIZE - stream->offset : total;
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memcpy(stream->in + stream->offset, ptr, copyin);
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ptr += copyin;
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stream->offset += copyin;
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this->nput += copyin;
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total -= copyin;
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if (stream->offset == LZF_STREAM_BLOCKSIZE)
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{
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outlen = lzf_compress(stream->in, stream->offset,
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&stream->out[LZF_MAX_HDR_SIZE],
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stream->offset, stream->state,
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&header);
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if (outlen > 0)
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{
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ret = stream->backend->puts(stream->backend, header, outlen);
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if (ret < 0)
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{
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return ret;
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}
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}
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stream->offset = 0;
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}
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}
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return len;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_lzfoutstream
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*
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* Description:
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* LZF compressed pipeline stream
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*
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* Input Parameters:
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* stream - User allocated, uninitialized instance of struct
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* lib_lzfoutstream_s to be initialized.
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* backend - Stream backend port.
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*
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* Returned Value:
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* None (User allocated instance initialized).
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*
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****************************************************************************/
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void lib_lzfoutstream(FAR struct lib_lzfoutstream_s *stream,
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FAR struct lib_outstream_s *backend)
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{
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if (stream == NULL || backend == NULL)
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{
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return;
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}
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memset(stream, 0, sizeof(*stream));
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stream->public.puts = lzfoutstream_puts;
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stream->public.flush = lzfoutstream_flush;
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stream->backend = backend;
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}
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