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Optimized varint routines and tests added. (CVS 1380)

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FossilOrigin-Name: d4e0933dc72b66157164610e0b03f339bc535fb9
This commit is contained in:
drh
2004-05-14 16:50:06 +00:00
parent 10617cddf6
commit 6d2fb15475
7 changed files with 169 additions and 71 deletions
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49
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.136 2004/05/14 15:27:28 drh Exp $
** $Id: btree.c,v 1.137 2004/05/14 16:50:06 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -334,50 +334,11 @@ static void put4byte(unsigned char *p, u32 v){
}
/*
** Read a variable-length integer. Store the result in *pResult.
** Return the number of bytes in the integer.
** Routines to read and write variable-length integers.
*/
static unsigned int getVarint(unsigned char *p, u64 *pResult){
u64 x = 0;
int n = 0;
unsigned char c;
do{
c = p[n++];
x = (x<<7) | (c & 0x7f);
}while( (c & 0x80)!=0 );
*pResult = x;
return n;
}
static unsigned int getVarint32(unsigned char *p, u32 *pResult){
u32 x = 0;
int n = 0;
unsigned char c;
do{
c = p[n++];
x = (x<<7) | (c & 0x7f);
}while( (c & 0x80)!=0 );
*pResult = x;
return n;
}
/*
** Write a variable length integer with value v into p[]. Return
** the number of bytes written.
*/
static unsigned int putVarint(unsigned char *p, u64 v){
int i, j, n;
u8 buf[10];
n = 0;
do{
buf[n++] = (v & 0x7f) | 0x80;
v >>= 7;
}while( v!=0 );
buf[0] &= 0x7f;
for(i=0, j=n-1; j>=0; j--, i++){
p[i] = buf[j];
}
return n;
}
#define getVarint sqlite3GetVarint
#define getVarint32 sqlite3GetVarint32
#define putVarint sqlite3PutVarint
/*
** Parse a cell header and fill in the CellInfo structure.