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regroup all mentions of ZSTD_REP_MOVE within zstd_compress_internal.h

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This commit is contained in:
Yann Collet 2021-12-28 13:47:57 -08:00
parent a34ccad9a6
commit de9f52e945
3 changed files with 6 additions and 9 deletions
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1
lib/common/zstd_internal.h
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@ -67,7 +67,6 @@ extern "C" {
#define ZSTD_OPT_NUM (1<<12)
#define ZSTD_REP_NUM 3 /* number of repcodes */
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
static UNUSED_ATTR const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 };
#define KB *(1 <<10)

9
lib/compress/zstd_compress_internal.h
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@ -129,7 +129,7 @@ size_t ZSTD_buildBlockEntropyStats(seqStore_t* seqStorePtr,
*********************************/
typedef struct {
U32 off; /* Offset code (offset + ZSTD_REP_MOVE) for the match */
U32 off; /* Offset sumtype code for the match, using ZSTD_storeSeq() format */
U32 len; /* Raw length of match */
} ZSTD_match_t;
@ -577,22 +577,21 @@ ZSTD_safecopyLiterals(BYTE* op, BYTE const* ip, BYTE const* const iend, BYTE con
while (ip < iend) *op++ = *ip++;
}
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
#define STORE_REPCODE_1 STORE_REPCODE(1)
#define STORE_REPCODE_2 STORE_REPCODE(2)
#define STORE_REPCODE_3 STORE_REPCODE(3)
#define STORE_REPCODE(r) (assert((r)>=1), assert((r)<=3), (r)-1)
#define STORE_OFFSET(o) (assert((o)>0), o + ZSTD_REP_MOVE)
#define STORED_IS_OFFSET(o) ((o) > ZSTD_REP_MOVE)
#define STORED_IS_REPCODE(o) ((o) < ZSTD_REP_NUM)
#define STORED_IS_REPCODE(o) ((o) <= ZSTD_REP_MOVE)
#define STORED_OFFSET(o) (assert(STORED_IS_OFFSET(o)), (o)-ZSTD_REP_MOVE)
#define STORED_REPCODE(o) (assert(STORED_IS_REPCODE(o)), (o)+1) /* returns ID 1,2,3 */
#define STORED_TO_OFFBASE(o) ((o)+1)
/*! ZSTD_storeSeq() :
* Store a sequence (litlen, litPtr, offCode and matchLength) into seqStore_t.
* @offBase_minus1 : distance to match + ZSTD_REP_MOVE (values <= ZSTD_REP_MOVE are repCodes).
* Users should not specify the encoded value directly,
* instead use macros STORE_REPCODE_X and STORE_OFFSET().
* @offBase_minus1 : Users should use employ macros STORE_REPCODE_X and STORE_OFFSET().
* @matchLength : must be >= MINMATCH
* Allowed to overread literals up to litLimit.
*/

5
lib/compress/zstd_lazy.c
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@ -1648,9 +1648,8 @@ ZSTD_compressBlock_lazy_generic(
}
/* NOTE:
* start[-offset+ZSTD_REP_MOVE-1] is undefined behavior.
* (-offset+ZSTD_REP_MOVE-1) is unsigned, and is added to start, which
* overflows the pointer, which is undefined behavior.
* Pay attention that `start[-value]` can lead to strange undefined behavior
* notably if `value` is unsigned, resulting in a large positive `-value`.
*/
/* catch up */
if (offcode) {