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Star 22016
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TDengine
TDengine
提交 7a21781a 编写于 作者: H Hongze Cheng
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refact code

上级 b77ea5e1
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Showing with 497 addition and 511 deletion
source/dnode/vnode/CMakeLists.txt
浏览文件 @ 7a21781a
......@@ -51,7 +51,6 @@ target_sources(
"src/tsdb/tsdbCacheRead.c"
"src/tsdb/tsdbRetention.c"
"src/tsdb/tsdbDiskData.c"
"src/tsdb/tsdbCompress.c"
"src/tsdb/tsdbCompact.c"
"src/tsdb/tsdbMergeTree.c"
......
source/dnode/vnode/src/tsdb/tsdbCompress.c 已删除 100644 → 0
浏览文件 @ b77ea5e1
/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "lz4.h"
#include "tsdb.h"
#define I64_SAFE_ADD(a, b) (((a) >= 0 && (b) <= INT64_MAX - (b)) || ((a) < 0 && (b) >= INT64_MIN - (a)))
typedef struct {
int8_t type;
int8_t cmprAlg;
uint8_t *aBuf[2];
int64_t nBuf[2];
union {
// Timestamp ----
struct {
int8_t ts_copy;
int32_t ts_n;
int64_t ts_prev_val;
int64_t ts_prev_delta;
uint8_t *ts_flag_p;
};
// Integer ----
struct {
int8_t i_copy;
int32_t i_n;
int64_t i_prev;
int32_t i_selector;
int32_t i_nele;
};
// Float ----
struct {
int32_t f_n;
uint32_t f_prev;
uint8_t *f_flag_p;
};
// Double ----
struct {
int32_t d_n;
uint64_t d_prev;
uint8_t *d_flag_p;
};
// Bool ----
struct {
int32_t bool_n;
};
// Binary ----
struct {
int32_t b_n;
};
};
} SCompressor;
// Timestamp =====================================================
static int32_t tCompSetCopyMode(SCompressor *pCmprsor) {
int32_t code = 0;
if (pCmprsor->ts_n) {
code = tRealloc(&pCmprsor->aBuf[1], sizeof(int64_t) * (pCmprsor->ts_n + 1));
if (code) return code;
pCmprsor->nBuf[1] = 1;
int64_t n = 1;
int64_t valPrev;
int64_t delPrev;
uint64_t vZigzag;
while (n < pCmprsor->nBuf[0]) {
uint8_t n1 = pCmprsor->aBuf[0][0] & 0xf;
uint8_t n2 = pCmprsor->aBuf[0][0] >> 4;
n++;
vZigzag = 0;
for (uint8_t i = 0; i < n1; i++) {
vZigzag |= (((uint64_t)pCmprsor->aBuf[0][n]) << (sizeof(int64_t) * i));
n++;
}
int64_t delta_of_delta = ZIGZAGD(int64_t, vZigzag);
if (n == 2) {
delPrev = 0;
valPrev = delta_of_delta;
} else {
delPrev = delta_of_delta + delPrev;
valPrev = delPrev + valPrev;
}
memcpy(pCmprsor->aBuf[1] + pCmprsor->nBuf[1], &valPrev, sizeof(int64_t));
pCmprsor->nBuf[1] += sizeof(int64_t);
if (n >= pCmprsor->nBuf[0]) break;
vZigzag = 0;
for (uint8_t i = 0; i < n2; i++) {
vZigzag |= (((uint64_t)pCmprsor->aBuf[0][n]) << (sizeof(int64_t) * i));
n++;
}
delta_of_delta = ZIGZAGD(int64_t, vZigzag);
delPrev = delta_of_delta + delPrev;
valPrev = delPrev + valPrev;
}
uint8_t *pBuf = pCmprsor->aBuf[0];
pCmprsor->aBuf[0] = pCmprsor->aBuf[1];
pCmprsor->aBuf[1] = pBuf;
pCmprsor->nBuf[0] = pCmprsor->nBuf[1];
} else {
// TODO
}
pCmprsor->aBuf[0][0] = 0;
pCmprsor->ts_copy = 1;
return code;
}
static int32_t tCompTimestamp(SCompressor *pCmprsor, TSKEY ts) {
int32_t code = 0;
if (pCmprsor->ts_n == 0) {
pCmprsor->ts_prev_val = ts;
pCmprsor->ts_prev_delta = -ts;
}
if (pCmprsor->ts_copy) goto _copy_exit;
if (!I64_SAFE_ADD(ts, -pCmprsor->ts_prev_val)) {
code = tCompSetCopyMode(pCmprsor);
if (code) return code;
goto _copy_exit;
}
int64_t delta = ts - pCmprsor->ts_prev_val;
if (!I64_SAFE_ADD(delta, -pCmprsor->ts_prev_delta)) {
code = tCompSetCopyMode(pCmprsor);
if (code) return code;
goto _copy_exit;
}
int64_t delta_of_delta = delta - pCmprsor->ts_prev_delta;
uint64_t zigzag_value = ZIGZAGE(int64_t, delta_of_delta);
pCmprsor->ts_prev_val = ts;
pCmprsor->ts_prev_delta = delta;
if (pCmprsor->ts_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 17 /*sizeof(int64_t) * 2 + 1*/);
if (code) return code;
pCmprsor->ts_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p[0] = 0;
while (zigzag_value) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (zigzag_value & 0xff);
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p[0]++;
}
} else {
while (zigzag_value) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (zigzag_value & 0xff);
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p += (uint8_t)0x10;
}
}
pCmprsor->ts_n++;
return code;
_copy_exit:
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + sizeof(int64_t));
if (code) return code;
memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], &ts, sizeof(ts));
pCmprsor->nBuf[0] += sizeof(ts);
pCmprsor->ts_n++;
return code;
}
// Integer =====================================================
#define SIMPLE8B_MAX ((uint64_t)1152921504606846974LL)
static const char bit_per_integer[] = {0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 15, 20, 30, 60};
static const int32_t selector_to_elems[] = {240, 120, 60, 30, 20, 15, 12, 10, 8, 7, 6, 5, 4, 3, 2, 1};
static const char bit_to_selector[] = {0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 11, 11, 12, 12, 12,
13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15};
static int32_t tCompI64(SCompressor *pCmprsor, int64_t val) {
int32_t code = 0;
if (pCmprsor->i_copy == 1) goto _copy_cmpr;
if (!I64_SAFE_ADD(val, pCmprsor->i_prev)) {
// TODO
goto _copy_cmpr;
}
int64_t diff = val - pCmprsor->i_prev;
uint64_t vZigzag = ZIGZAGE(int64_t, diff);
if (vZigzag >= SIMPLE8B_MAX) {
// TODO
goto _copy_cmpr;
}
int64_t nBit;
if (vZigzag) {
nBit = 64 - BUILDIN_CLZL(vZigzag);
} else {
nBit = 0;
}
if (pCmprsor->i_nele + 1 <= selector_to_elems[pCmprsor->i_selector] &&
pCmprsor->i_nele + 1 <= selector_to_elems[bit_to_selector[nBit]]) {
if (pCmprsor->i_selector < bit_to_selector[nBit]) {
pCmprsor->i_selector = bit_to_selector[nBit];
}
pCmprsor->i_nele++;
} else {
while (pCmprsor->i_nele < selector_to_elems[pCmprsor->i_selector]) {
pCmprsor->i_selector++;
}
pCmprsor->i_nele = selector_to_elems[pCmprsor->i_selector];
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + sizeof(uint64_t));
if (code) return code;
uint64_t *bp = pCmprsor->aBuf[0] + pCmprsor->nBuf[0];
pCmprsor->nBuf[0] += sizeof(uint64_t);
bp[0] = pCmprsor->i_selector;
for (int32_t iVal = 0; iVal < pCmprsor->i_nele; iVal++) {
/* code */
}
// reset and continue
}
return code;
_copy_cmpr:
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + tDataTypes[pCmprsor->type].bytes);
if (code) return code;
memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], NULL /* todo */, tDataTypes[pCmprsor->type].bytes);
pCmprsor->nBuf[0] += tDataTypes[pCmprsor->type].bytes;
return code;
}
// Float =====================================================
static int32_t tCompFloat(SCompressor *pCmprsor, float f) {
int32_t code = 0;
union {
float f;
uint32_t u;
} val = {.f = f};
uint32_t diff = val.u ^ pCmprsor->f_prev;
pCmprsor->f_prev = val.u;
int32_t clz, ctz;
if (diff) {
clz = BUILDIN_CLZ(diff);
ctz = BUILDIN_CTZ(diff);
} else {
clz = sizeof(uint32_t);
ctz = sizeof(uint32_t);
}
if (pCmprsor->f_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 9 /* sizeof(float) * 2 + 1 */);
if (code) return code;
pCmprsor->f_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
if (clz < ctz) {
uint8_t nBytes = sizeof(uint32_t) - ctz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] = (0x08 | (nBytes - 1));
diff >>= (32 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint32_t) - clz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] = nBytes - 1;
}
} else {
if (clz < ctz) {
uint8_t nBytes = sizeof(uint32_t) - ctz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] |= ((0x08 | (nBytes - 1)) << 4);
diff >>= (32 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint32_t) - clz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] |= ((nBytes - 1) << 4);
}
}
while (diff) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (diff & 0xff);
pCmprsor->nBuf[0]++;
diff >>= BITS_PER_BYTE;
}
pCmprsor->f_n++;
return code;
}
// Double =====================================================
static int32_t tCompDouble(SCompressor *pCmprsor, double d) {
int32_t code = 0;
union {
double d;
uint64_t u;
} val = {.d = d};
uint64_t diff = val.u ^ pCmprsor->d_prev;
pCmprsor->d_prev = val.u;
int32_t clz, ctz;
if (diff) {
clz = BUILDIN_CLZL(diff);
ctz = BUILDIN_CTZL(diff);
} else {
clz = sizeof(uint64_t);
ctz = sizeof(uint64_t);
}
if (pCmprsor->d_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 17 /* sizeof(double) * 2 + 1 */);
if (code) return code;
pCmprsor->d_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
if (clz < ctz) {
uint8_t nBytes = sizeof(uint64_t) - ctz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] = (0x08 | (nBytes - 1));
diff >>= (64 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint64_t) - clz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] = nBytes - 1;
}
} else {
if (clz < ctz) {
uint8_t nBytes = sizeof(uint64_t) - ctz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] |= ((0x08 | (nBytes - 1)) << 4);
diff >>= (64 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint64_t) - clz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] |= ((nBytes - 1) << 4);
}
}
while (diff) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (diff & 0xff);
pCmprsor->nBuf[0]++;
diff >>= BITS_PER_BYTE;
}
pCmprsor->d_n++;
return code;
}
// Binary =====================================================
static int32_t tCompBinary(SCompressor *pCmprsor, const uint8_t *pData, int32_t nData) {
int32_t code = 0;
if (nData) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + nData);
if (code) return code;
memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], pData, nData);
pCmprsor->nBuf[0] += nData;
}
pCmprsor->b_n++;
return code;
}
// Bool =====================================================
static const uint8_t BOOL_CMPR_TABLE[] = {0b01, 0b0100, 0b010000, 0b01000000};
static int32_t tCompBool(SCompressor *pCmprsor, bool vBool) {
int32_t code = 0;
int32_t mod4 = pCmprsor->bool_n & 3;
if (vBool) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] |= BOOL_CMPR_TABLE[mod4];
}
pCmprsor->bool_n++;
if (mod4 == 3) {
pCmprsor->nBuf[0]++;
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = 0;
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0]);
if (code) goto _exit;
}
_exit:
return code;
}
// SCompressor =====================================================
int32_t tCompressorCreate(SCompressor **ppCmprsor) {
int32_t code = 0;
*ppCmprsor = (SCompressor *)taosMemoryCalloc(1, sizeof(SCompressor));
if ((*ppCmprsor) == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
goto _exit;
}
code = tRealloc(&(*ppCmprsor)->aBuf[0], 1024);
if (code) {
taosMemoryFree(*ppCmprsor);
*ppCmprsor = NULL;
goto _exit;
}
_exit:
return code;
}
int32_t tCompressorDestroy(SCompressor *pCmprsor) {
int32_t code = 0;
if (pCmprsor) {
int32_t nBuf = sizeof(pCmprsor->aBuf) / sizeof(pCmprsor->aBuf[0]);
for (int32_t iBuf = 0; iBuf < nBuf; iBuf++) {
tFree(pCmprsor->aBuf[iBuf]);
}
taosMemoryFree(pCmprsor);
}
return code;
}
int32_t tCompressorReset(SCompressor *pCmprsor, int8_t type, int8_t cmprAlg) {
int32_t code = 0;
pCmprsor->type = type;
pCmprsor->cmprAlg = cmprAlg;
pCmprsor->nBuf[0] = 0; // (todo) may or may not +/- 1
switch (type) {
case TSDB_DATA_TYPE_TIMESTAMP:
pCmprsor->ts_copy = 0;
pCmprsor->ts_n = 0;
break;
case TSDB_DATA_TYPE_BOOL:
pCmprsor->bool_n = 0;
pCmprsor->aBuf[0][0] = 0;
break;
case TSDB_DATA_TYPE_BINARY:
pCmprsor->b_n = 0;
break;
default:
break;
}
return code;
}
int32_t tCompGen(SCompressor *pCmprsor, const uint8_t **ppData, int64_t *nData) {
int32_t code = 0;
if (pCmprsor->cmprAlg == TWO_STAGE_COMP || IS_VAR_DATA_TYPE(pCmprsor->type)) {
code = tRealloc(&pCmprsor->aBuf[1], pCmprsor->nBuf[0] + 1);
if (code) goto _exit;
int64_t ret = LZ4_compress_default(pCmprsor->aBuf[0], pCmprsor->aBuf[1] + 1, pCmprsor->nBuf[0], pCmprsor->nBuf[0]);
if (ret) {
pCmprsor->aBuf[1][0] = 0;
pCmprsor->nBuf[1] = ret + 1;
} else {
pCmprsor->aBuf[1][0] = 1;
memcpy(pCmprsor->aBuf[1] + 1, pCmprsor->aBuf[0], pCmprsor->nBuf[0]);
pCmprsor->nBuf[1] = pCmprsor->nBuf[0] + 1;
}
*ppData = pCmprsor->aBuf[1];
*nData = pCmprsor->nBuf[1];
} else {
*ppData = pCmprsor->aBuf[0];
*nData = pCmprsor->nBuf[0];
}
_exit:
return code;
}
int32_t tCompress(SCompressor *pCmprsor, void *pData, int64_t nData) {
int32_t code = 0;
// TODO
return code;
}
\ No newline at end of file
source/util/src/tcompression.c
浏览文件 @ 7a21781a
......@@ -50,6 +50,7 @@
#define _DEFAULT_SOURCE
#include "tcompression.h"
#include "lz4.h"
#include "tRealloc.h"
#include "tlog.h"
#ifdef TD_TSZ
......@@ -994,3 +995,499 @@ int32_t tsDecompressDoubleLossyImp(const char *input, int32_t compressedSize, co
return tdszDecompress(SZ_DOUBLE, input + 1, compressedSize - 1, nelements, output);
}
#endif
/*************************************************************************
* STREAM COMPRESSION
*************************************************************************/
#define I64_SAFE_ADD(a, b) (((a) >= 0 && (b) <= INT64_MAX - (b)) || ((a) < 0 && (b) >= INT64_MIN - (a)))
typedef struct {
int8_t type;
int8_t cmprAlg;
uint8_t *aBuf[2];
int64_t nBuf[2];
union {
// Timestamp ----
struct {
int8_t ts_copy;
int32_t ts_n;
int64_t ts_prev_val;
int64_t ts_prev_delta;
uint8_t *ts_flag_p;
};
// Integer ----
struct {
int8_t i_copy;
int32_t i_n;
int64_t i_prev;
int32_t i_selector;
int32_t i_nele;
};
// Float ----
struct {
int32_t f_n;
uint32_t f_prev;
uint8_t *f_flag_p;
};
// Double ----
struct {
int32_t d_n;
uint64_t d_prev;
uint8_t *d_flag_p;
};
// Bool ----
struct {
int32_t bool_n;
};
// Binary ----
struct {
int32_t b_n;
};
};
} SCompressor;
// Timestamp =====================================================
static int32_t tCompSetCopyMode(SCompressor *pCmprsor) {
int32_t code = 0;
if (pCmprsor->ts_n) {
code = tRealloc(&pCmprsor->aBuf[1], sizeof(int64_t) * (pCmprsor->ts_n + 1));
if (code) return code;
pCmprsor->nBuf[1] = 1;
int64_t n = 1;
int64_t valPrev;
int64_t delPrev;
uint64_t vZigzag;
while (n < pCmprsor->nBuf[0]) {
uint8_t n1 = pCmprsor->aBuf[0][0] & 0xf;
uint8_t n2 = pCmprsor->aBuf[0][0] >> 4;
n++;
vZigzag = 0;
for (uint8_t i = 0; i < n1; i++) {
vZigzag |= (((uint64_t)pCmprsor->aBuf[0][n]) << (sizeof(int64_t) * i));
n++;
}
int64_t delta_of_delta = ZIGZAG_DECODE(int64_t, vZigzag);
if (n == 2) {
delPrev = 0;
valPrev = delta_of_delta;
} else {
delPrev = delta_of_delta + delPrev;
valPrev = delPrev + valPrev;
}
memcpy(pCmprsor->aBuf[1] + pCmprsor->nBuf[1], &valPrev, sizeof(int64_t));
pCmprsor->nBuf[1] += sizeof(int64_t);
if (n >= pCmprsor->nBuf[0]) break;
vZigzag = 0;
for (uint8_t i = 0; i < n2; i++) {
vZigzag |= (((uint64_t)pCmprsor->aBuf[0][n]) << (sizeof(int64_t) * i));
n++;
}
delta_of_delta = ZIGZAG_DECODE(int64_t, vZigzag);
delPrev = delta_of_delta + delPrev;
valPrev = delPrev + valPrev;
}
uint8_t *pBuf = pCmprsor->aBuf[0];
pCmprsor->aBuf[0] = pCmprsor->aBuf[1];
pCmprsor->aBuf[1] = pBuf;
pCmprsor->nBuf[0] = pCmprsor->nBuf[1];
} else {
// TODO
}
pCmprsor->aBuf[0][0] = 0;
pCmprsor->ts_copy = 1;
return code;
}
static int32_t tCompTimestamp(SCompressor *pCmprsor, TSKEY ts) {
int32_t code = 0;
if (pCmprsor->ts_n == 0) {
pCmprsor->ts_prev_val = ts;
pCmprsor->ts_prev_delta = -ts;
}
if (pCmprsor->ts_copy) goto _copy_exit;
if (!I64_SAFE_ADD(ts, -pCmprsor->ts_prev_val)) {
code = tCompSetCopyMode(pCmprsor);
if (code) return code;
goto _copy_exit;
}
int64_t delta = ts - pCmprsor->ts_prev_val;
if (!I64_SAFE_ADD(delta, -pCmprsor->ts_prev_delta)) {
code = tCompSetCopyMode(pCmprsor);
if (code) return code;
goto _copy_exit;
}
int64_t delta_of_delta = delta - pCmprsor->ts_prev_delta;
uint64_t zigzag_value = ZIGZAG_ENCODE(int64_t, delta_of_delta);
pCmprsor->ts_prev_val = ts;
pCmprsor->ts_prev_delta = delta;
if (pCmprsor->ts_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 17 /*sizeof(int64_t) * 2 + 1*/);
if (code) return code;
pCmprsor->ts_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p[0] = 0;
while (zigzag_value) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (zigzag_value & 0xff);
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p[0]++;
}
} else {
while (zigzag_value) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (zigzag_value & 0xff);
pCmprsor->nBuf[0]++;
pCmprsor->ts_flag_p += (uint8_t)0x10;
}
}
pCmprsor->ts_n++;
return code;
_copy_exit:
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + sizeof(int64_t));
if (code) return code;
memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], &ts, sizeof(ts));
pCmprsor->nBuf[0] += sizeof(ts);
pCmprsor->ts_n++;
return code;
}
// Integer =====================================================
#define SIMPLE8B_MAX ((uint64_t)1152921504606846974LL)
static const char bit_per_integer[] = {0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 15, 20, 30, 60};
static const int32_t selector_to_elems[] = {240, 120, 60, 30, 20, 15, 12, 10, 8, 7, 6, 5, 4, 3, 2, 1};
static const char bit_to_selector[] = {0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 11, 11, 12, 12, 12,
13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15};
static int32_t tCompI64(SCompressor *pCmprsor, int64_t val) {
int32_t code = 0;
if (pCmprsor->i_copy == 1) goto _copy_cmpr;
if (!I64_SAFE_ADD(val, pCmprsor->i_prev)) {
// TODO
goto _copy_cmpr;
}
int64_t diff = val - pCmprsor->i_prev;
uint64_t vZigzag = ZIGZAG_ENCODE(int64_t, diff);
if (vZigzag >= SIMPLE8B_MAX) {
// TODO
goto _copy_cmpr;
}
int64_t nBit;
if (vZigzag) {
nBit = 64 - BUILDIN_CLZL(vZigzag);
} else {
nBit = 0;
}
if (pCmprsor->i_nele + 1 <= selector_to_elems[pCmprsor->i_selector] &&
pCmprsor->i_nele + 1 <= selector_to_elems[bit_to_selector[nBit]]) {
if (pCmprsor->i_selector < bit_to_selector[nBit]) {
pCmprsor->i_selector = bit_to_selector[nBit];
}
pCmprsor->i_nele++;
} else {
while (pCmprsor->i_nele < selector_to_elems[pCmprsor->i_selector]) {
pCmprsor->i_selector++;
}
pCmprsor->i_nele = selector_to_elems[pCmprsor->i_selector];
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + sizeof(uint64_t));
if (code) return code;
uint64_t *bp = (uint64_t *)(pCmprsor->aBuf[0] + pCmprsor->nBuf[0]);
pCmprsor->nBuf[0] += sizeof(uint64_t);
bp[0] = pCmprsor->i_selector;
for (int32_t iVal = 0; iVal < pCmprsor->i_nele; iVal++) {
/* code */
}
// reset and continue
}
return code;
_copy_cmpr:
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 0 /*tDataTypes[pCmprsor->type].bytes (todo)*/);
if (code) return code;
// memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], NULL /* todo */, 0 /*tDataTypes[pCmprsor->type].bytes (todo)*/);
// pCmprsor->nBuf[0] += tDataTypes[pCmprsor->type].bytes;
return code;
}
// Float =====================================================
static int32_t tCompFloat(SCompressor *pCmprsor, float f) {
int32_t code = 0;
union {
float f;
uint32_t u;
} val = {.f = f};
uint32_t diff = val.u ^ pCmprsor->f_prev;
pCmprsor->f_prev = val.u;
int32_t clz, ctz;
if (diff) {
clz = BUILDIN_CLZ(diff);
ctz = BUILDIN_CTZ(diff);
} else {
clz = sizeof(uint32_t);
ctz = sizeof(uint32_t);
}
if (pCmprsor->f_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 9 /* sizeof(float) * 2 + 1 */);
if (code) return code;
pCmprsor->f_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
if (clz < ctz) {
uint8_t nBytes = sizeof(uint32_t) - ctz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] = (0x08 | (nBytes - 1));
diff >>= (32 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint32_t) - clz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] = nBytes - 1;
}
} else {
if (clz < ctz) {
uint8_t nBytes = sizeof(uint32_t) - ctz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] |= ((0x08 | (nBytes - 1)) << 4);
diff >>= (32 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint32_t) - clz / BITS_PER_BYTE;
pCmprsor->f_flag_p[0] |= ((nBytes - 1) << 4);
}
}
while (diff) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (diff & 0xff);
pCmprsor->nBuf[0]++;
diff >>= BITS_PER_BYTE;
}
pCmprsor->f_n++;
return code;
}
// Double =====================================================
static int32_t tCompDouble(SCompressor *pCmprsor, double d) {
int32_t code = 0;
union {
double d;
uint64_t u;
} val = {.d = d};
uint64_t diff = val.u ^ pCmprsor->d_prev;
pCmprsor->d_prev = val.u;
int32_t clz, ctz;
if (diff) {
clz = BUILDIN_CLZL(diff);
ctz = BUILDIN_CTZL(diff);
} else {
clz = sizeof(uint64_t);
ctz = sizeof(uint64_t);
}
if (pCmprsor->d_n & 0x1 == 0) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + 17 /* sizeof(double) * 2 + 1 */);
if (code) return code;
pCmprsor->d_flag_p = &pCmprsor->aBuf[0][pCmprsor->nBuf[0]];
pCmprsor->nBuf[0]++;
if (clz < ctz) {
uint8_t nBytes = sizeof(uint64_t) - ctz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] = (0x08 | (nBytes - 1));
diff >>= (64 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint64_t) - clz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] = nBytes - 1;
}
} else {
if (clz < ctz) {
uint8_t nBytes = sizeof(uint64_t) - ctz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] |= ((0x08 | (nBytes - 1)) << 4);
diff >>= (64 - nBytes * BITS_PER_BYTE);
} else {
uint8_t nBytes = sizeof(uint64_t) - clz / BITS_PER_BYTE;
pCmprsor->d_flag_p[0] |= ((nBytes - 1) << 4);
}
}
while (diff) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = (diff & 0xff);
pCmprsor->nBuf[0]++;
diff >>= BITS_PER_BYTE;
}
pCmprsor->d_n++;
return code;
}
// Binary =====================================================
static int32_t tCompBinary(SCompressor *pCmprsor, const uint8_t *pData, int32_t nData) {
int32_t code = 0;
if (nData) {
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0] + nData);
if (code) return code;
memcpy(pCmprsor->aBuf[0] + pCmprsor->nBuf[0], pData, nData);
pCmprsor->nBuf[0] += nData;
}
pCmprsor->b_n++;
return code;
}
// Bool =====================================================
static const uint8_t BOOL_CMPR_TABLE[] = {0b01, 0b0100, 0b010000, 0b01000000};
static int32_t tCompBool(SCompressor *pCmprsor, bool vBool) {
int32_t code = 0;
int32_t mod4 = pCmprsor->bool_n & 3;
if (vBool) {
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] |= BOOL_CMPR_TABLE[mod4];
}
pCmprsor->bool_n++;
if (mod4 == 3) {
pCmprsor->nBuf[0]++;
pCmprsor->aBuf[0][pCmprsor->nBuf[0]] = 0;
code = tRealloc(&pCmprsor->aBuf[0], pCmprsor->nBuf[0]);
if (code) goto _exit;
}
_exit:
return code;
}
// SCompressor =====================================================
int32_t tCompressorCreate(SCompressor **ppCmprsor) {
int32_t code = 0;
*ppCmprsor = (SCompressor *)taosMemoryCalloc(1, sizeof(SCompressor));
if ((*ppCmprsor) == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
goto _exit;
}
code = tRealloc(&(*ppCmprsor)->aBuf[0], 1024);
if (code) {
taosMemoryFree(*ppCmprsor);
*ppCmprsor = NULL;
goto _exit;
}
_exit:
return code;
}
int32_t tCompressorDestroy(SCompressor *pCmprsor) {
int32_t code = 0;
if (pCmprsor) {
int32_t nBuf = sizeof(pCmprsor->aBuf) / sizeof(pCmprsor->aBuf[0]);
for (int32_t iBuf = 0; iBuf < nBuf; iBuf++) {
tFree(pCmprsor->aBuf[iBuf]);
}
taosMemoryFree(pCmprsor);
}
return code;
}
int32_t tCompressorReset(SCompressor *pCmprsor, int8_t type, int8_t cmprAlg) {
int32_t code = 0;
pCmprsor->type = type;
pCmprsor->cmprAlg = cmprAlg;
pCmprsor->nBuf[0] = 0; // (todo) may or may not +/- 1
switch (type) {
case TSDB_DATA_TYPE_TIMESTAMP:
pCmprsor->ts_copy = 0;
pCmprsor->ts_n = 0;
break;
case TSDB_DATA_TYPE_BOOL:
pCmprsor->bool_n = 0;
pCmprsor->aBuf[0][0] = 0;
break;
case TSDB_DATA_TYPE_BINARY:
pCmprsor->b_n = 0;
break;
default:
break;
}
return code;
}
int32_t tCompGen(SCompressor *pCmprsor, const uint8_t **ppData, int64_t *nData) {
int32_t code = 0;
if (pCmprsor->cmprAlg == TWO_STAGE_COMP /*|| IS_VAR_DATA_TYPE(pCmprsor->type)*/) {
code = tRealloc(&pCmprsor->aBuf[1], pCmprsor->nBuf[0] + 1);
if (code) goto _exit;
int64_t ret = LZ4_compress_default(pCmprsor->aBuf[0], pCmprsor->aBuf[1] + 1, pCmprsor->nBuf[0], pCmprsor->nBuf[0]);
if (ret) {
pCmprsor->aBuf[1][0] = 0;
pCmprsor->nBuf[1] = ret + 1;
} else {
pCmprsor->aBuf[1][0] = 1;
memcpy(pCmprsor->aBuf[1] + 1, pCmprsor->aBuf[0], pCmprsor->nBuf[0]);
pCmprsor->nBuf[1] = pCmprsor->nBuf[0] + 1;
}
*ppData = pCmprsor->aBuf[1];
*nData = pCmprsor->nBuf[1];
} else {
*ppData = pCmprsor->aBuf[0];
*nData = pCmprsor->nBuf[0];
}
_exit:
return code;
}
int32_t tCompress(SCompressor *pCmprsor, void *pData, int64_t nData) {
int32_t code = 0;
// TODO
return code;
}
\ No newline at end of file
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