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libc/lzfcompress: add lzf compress stream

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compress stream based on lzf algorithm:

  struct lib_rawoutstream_s rawstream;
  struct lib_lzfoutstream_s lzfstream;

  lib_rawoutstream(&rawstream, fd);
  lib_lzfoutstream(&lzfstream, &rawstream);

Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an
2021-11-23 18:33:20 +08:00
committed by Xiang Xiao
parent d445282566
commit ce1c8413a2
6 changed files with 227 additions and 0 deletions
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include/lzf.h
+10
View File
@@ -32,10 +32,19 @@
#ifndef __INCLUDE_LZF_H
#define __INCLUDE_LZF_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <stdint.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_LIBC_LZF
#define LZF_VERSION 0x0105 /* 1.5, API version */
#define HLOG CONFIG_LIBC_LZF_HLOG
@@ -151,4 +160,5 @@ unsigned int lzf_decompress(FAR const void *const in_data,
unsigned int in_len, FAR void *out_data,
unsigned int out_len);
#endif /* CONFIG_LIBC_LZF */
#endif /* __INCLUDE_LZF_H */
include/nuttx/streams.h
+45
View File
@@ -26,8 +26,18 @@
****************************************************************************/
#include <nuttx/config.h>
#include <lzf.h>
#include <stdio.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_LIBC_LZF
#define LZF_STREAM_BLOCKSIZE ((1 << CONFIG_STREAM_LZF_BLOG) - 1)
#endif
/****************************************************************************
* Public Types
****************************************************************************/
@@ -173,6 +183,20 @@ struct lib_rawsostream_s
int fd;
};
/* LZF compressed stream pipeline */
#ifdef CONFIG_LIBC_LZF
struct lib_lzfoutstream_s
{
struct lib_outstream_s public;
FAR struct lib_outstream_s *backend;
lzf_state_t state;
size_t offset;
char in[LZF_STREAM_BLOCKSIZE];
char out[LZF_MAX_HDR_SIZE + LZF_STREAM_BLOCKSIZE];
};
#endif
/****************************************************************************
* Public Data
****************************************************************************/
@@ -329,6 +353,27 @@ void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream);
void lib_nullinstream(FAR struct lib_instream_s *nullinstream);
void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);
/****************************************************************************
* Name: lib_lzfoutstream
*
* Description:
* LZF compressed pipeline stream
*
* Input Parameters:
* stream - User allocated, uninitialized instance of struct
* lib_lzfoutstream_s to be initialized.
* backend - Stream backend port.
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
#ifdef CONFIG_LIBC_LZF
void lib_lzfoutstream(FAR struct lib_lzfoutstream_s *stream,
FAR struct lib_outstream_s *backend);
#endif
/****************************************************************************
* Name: lib_noflush
*