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Faster text decoder for kv_os.c.

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FossilOrigin-Name: 3354a2edb762d70ccc31d4d25f81b70e644d76e01cb1e81d2e97b5414d809d30
This commit is contained in:
drh
2022-09-12 17:44:35 +00:00
parent 1ad51ffe21
commit 6acd7b0a75
3 changed files with 46 additions and 23 deletions
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55
src/os_kv.c
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@@ -527,12 +527,25 @@ static int kvvfsEncode(const char *aData, int nData, char *aOut){
return j;
}
/* Convert hex to binary */
static char kvvfsHexToBinary(char c){
if( c>='0' && c<='9' ) return c - '0';
if( c>='A' && c<='F' ) return c - 'A' + 10;
return 0;
}
static const signed char kvvfsHexValue[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
/*
** Decode the text encoding back to binary. The binary content is
@@ -540,28 +553,35 @@ static char kvvfsHexToBinary(char c){
**
** The return value is the number of bytes actually written into aOut[].
*/
static int kvvfsDecode(const char *aIn, char *aOut, int nOut){
static int kvvfsDecode(const char *a, char *aOut, int nOut){
int i, j;
int c;
const unsigned char *aIn = (const unsigned char*)a;
i = 0;
j = 0;
while( (c = aIn[i])!=0 ){
if( c>='a' ){
while( 1 ){
c = kvvfsHexValue[aIn[i]];
if( c<0 ){
int n = 0;
int mult = 1;
c = aIn[i];
if( c==0 ) break;
while( c>='a' && c<='z' ){
n += (c - 'a')*mult;
mult *= 26;
c = aIn[++i];
}
if( j+n>nOut ) return -1;
while( n-->0 ){
aOut[j++] = 0;
}
memset(&aOut[j], 0, n);
j += n;
c = aIn[i];
if( c==0 ) break;
}else{
if( j>nOut ) return -1;
aOut[j] = kvvfsHexToBinary(aIn[i++])<<4;
aOut[j++] += kvvfsHexToBinary(aIn[i++]);
aOut[j] = c<<4;
c = kvvfsHexValue[aIn[++i]];
if( c<0 ) break;
aOut[j++] += c;
i++;
}
}
return j;
@@ -1021,7 +1041,10 @@ static int kvvfsFullPathname(
int nOut,
char *zOut
){
size_t nPath = strlen(zPath);
size_t nPath;
zPath = "local";
nPath = strlen(zPath);
SQLITE_KV_LOG(("xFullPathname(\"%s\")\n", zPath));
if( nOut<nPath+1 ) nPath = nOut - 1;
memcpy(zOut, zPath, nPath);