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Consolidated varint macro usage from btreeInt.h, vdbe.c, and vdbeaux.c into sqliteInt.h and made their use consistent. Slight improvements to varint32 macros. (CVS 5045)

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FossilOrigin-Name: 0d04ccd97841bbbda564cc6ae5da057ee3888fa3
This commit is contained in:
shane
2008-04-24 19:15:09 +00:00
parent 9c9eb741be
commit 3f8d5cfcad
8 changed files with 74 additions and 86 deletions
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32
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.694 2008/04/17 17:02:02 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.695 2008/04/24 19:15:10 shane Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -1995,11 +1995,41 @@ int sqlite3FitsIn64Bits(const char *, int);
int sqlite3Utf16ByteLen(const void *pData, int nChar);
int sqlite3Utf8CharLen(const char *pData, int nByte);
int sqlite3Utf8Read(const u8*, const u8*, const u8**);
/*
** Routines to read and write variable-length integers. These used to
** be defined locally, but now we use the varint routines in the util.c
** file.
*/
int sqlite3PutVarint(unsigned char*, u64);
int sqlite3PutVarint32(unsigned char*, u32);
int sqlite3GetVarint(const unsigned char *, u64 *);
int sqlite3GetVarint32(const unsigned char *, u32 *);
int sqlite3VarintLen(u64 v);
/*
** The header of a record consists of a sequence variable-length integers.
** These integers are almost always small and are encoded as a single byte.
** The following macros take advantage this fact to provide a fast encode
** and decode of the integers in a record header. It is faster for the common
** case where the integer is a single byte. It is a little slower when the
** integer is two or more bytes. But overall it is faster.
**
** The following expressions are equivalent:
**
** x = sqlite3GetVarint32( A, &B );
** x = sqlite3PutVarint32( A, B );
**
** x = getVarint32( A, B );
** x = putVarint32( A, B );
**
*/
#define getVarint32(A,B) ((*(A)<(unsigned char)0x80) ? ((B) = (u32)*(A)),1 : sqlite3GetVarint32((A), &(B)))
#define putVarint32(A,B) (((B)<(u32)0x80) ? (*(A) = (unsigned char)(B)),1 : sqlite3PutVarint32((A), (B)))
#define getVarint sqlite3GetVarint
#define putVarint sqlite3PutVarint
void sqlite3IndexAffinityStr(Vdbe *, Index *);
void sqlite3TableAffinityStr(Vdbe *, Table *);
char sqlite3CompareAffinity(Expr *pExpr, char aff2);