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libc/lzf: Define structures to represent LZF headers.

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This commit is contained in:
Gregory Nutt
2018-03-18 12:31:50 -06:00
parent c8b567db61
commit ed59157a4b
2 changed files with 61 additions and 20 deletions
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include/lzf.h
+30 -1
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@@ -38,8 +38,12 @@
#define LZF_VERSION 0x0105 /* 1.5, API version */
#define HLOG CONFIG_LIBC_LZF_HLOG
#define LZF_TYPE0_HDR 0
#define LZF_TYPE1_HDR 1
#define LZF_TYPE0_HDR_SIZE 5
#define LZF_TYPE1_HDR_SIZE 7
#define LZF_MAX_HDR_SIZE 7
#define LZF_MIN_HDR_SIZE 5
@@ -47,6 +51,31 @@
* Public Types
****************************************************************************/
/* LZF headers */
struct lzf_header_s /* Common data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE0_HDR or LZF_TYPE1_HDR */
};
struct lzf_type0_header_s /* Uncompressed data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE0_HDR */
uint8_t lzf_len[2]; /* Data length (big-endian) */
};
struct lzf_type1_header_s /* Compressed data header */
{
uint8_t lzf_magic[2]; /* [0]='Z', [1]='V' */
uint8_t lzf_type; /* LZF_TYPE1_HDR */
uint8_t lzf_clen[2]; /* Compressed data length (big-endian) */
uint8_t lzf_ulen[2]; /* Unompressed data length (big-endian) */
};
/* LZF hash table */
#if LZF_USE_OFFSETS
# define LZF_HSLOT_BIAS ((const uint8_t *)in_data)
typedef unsigned int lzf_hslot_t;
@@ -95,7 +124,7 @@ typedef lzf_hslot_t lzf_state_t[1 << HLOG];
size_t lzf_compress(FAR const void *const in_data,
unsigned int in_len, FAR void *out_data,
unsigned int out_len, lzf_state_t htab,
FAR uint8_t **reshdr);
FAR struct lzf_header_s **reshdr);
/****************************************************************************
* Name: lzf_decompress