diff options
Diffstat (limited to 'lib/lz4hc.h')
| -rw-r--r-- | lib/lz4hc.h | 60 |
1 files changed, 59 insertions, 1 deletions
diff --git a/lib/lz4hc.h b/lib/lz4hc.h index 563ad98..0d20e2e 100644 --- a/lib/lz4hc.h +++ b/lib/lz4hc.h @@ -64,6 +64,59 @@ extern "C" { #define LZ4HC_DEFAULT_CLEVEL 9 #define LZ4HC_MAX_CLEVEL 16 + +/*-************************************ + * Private definitions + ************************************** + * Do not use these definitions. + * They are exposed to allow static allocation of `LZ4_streamHC_t`. + * If you use these definitions in your code, it will break when you upgrade LZ4 to a new version. +**************************************/ +#define LZ4HC_DICTIONARY_LOGSIZE 16 +#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE) +#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1) + +#define LZ4HC_HASH_LOG (LZ4HC_DICTIONARY_LOGSIZE-1) +#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG) +#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1) + + +#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +#include <stdint.h> + +typedef struct +{ + uint32_t hashTable[LZ4HC_HASHTABLESIZE]; + uint16_t chainTable[LZ4HC_MAXD]; + const uint8_t* end; /* next block here to continue on current prefix */ + const uint8_t* base; /* All index relative to this position */ + const uint8_t* dictBase; /* alternate base for extDict */ + uint8_t* inputBuffer; /* deprecated */ + uint32_t dictLimit; /* below that point, need extDict */ + uint32_t lowLimit; /* below that point, no more dict */ + uint32_t nextToUpdate; /* index from which to continue dictionary update */ + uint32_t compressionLevel; +} LZ4HC_Data_Structure; + +#else + +typedef struct +{ + unsigned int hashTable[LZ4HC_HASHTABLESIZE]; + unsigned short chainTable[LZ4HC_MAXD]; + const unsigned char* end; /* next block here to continue on current prefix */ + const unsigned char* base; /* All index relative to this position */ + const unsigned char* dictBase; /* alternate base for extDict */ + unsigned char* inputBuffer; /* deprecated */ + unsigned int dictLimit; /* below that point, need extDict */ + unsigned int lowLimit; /* below that point, no more dict */ + unsigned int nextToUpdate; /* index from which to continue dictionary update */ + unsigned int compressionLevel; +} LZ4HC_Data_Structure; + +#endif + + /*-************************************ * Block Compression **************************************/ @@ -108,7 +161,12 @@ LZ4HCLIB_API int LZ4_sizeofStateHC(void); **************************************/ #define LZ4_STREAMHCSIZE 262192 #define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t)) -typedef struct { size_t table[LZ4_STREAMHCSIZE_SIZET]; } LZ4_streamHC_t; +typedef struct { + union { + size_t table[LZ4_STREAMHCSIZE_SIZET]; + LZ4HC_Data_Structure internal_donotuse; + }; +} LZ4_streamHC_t; /* LZ4_streamHC_t This structure allows static allocation of LZ4 HC streaming state. |