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MySQL 5.1: mysql/src/5.1-dbg/include/my_vle.h File Reference

mysql/src/5.1-dbg/include/my_vle.h File Reference

#include "my_global.h"

Include dependency graph for my_vle.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.


Defines

#define my_vle_sizeof(ITEM)   (((sizeof(ITEM) * CHAR_BIT) + 6) / 7)

Functions

byte * my_vle_encode (byte *vle, my_size_t max, ulong value)
byte const * my_vle_decode (ulong *value_ptr, byte const *vle)

Define Documentation

#define my_vle_sizeof ( ITEM   )     (((sizeof(ITEM) * CHAR_BIT) + 6) / 7)

Definition at line 33 of file my_vle.h.

Referenced by my_vle_encode().

Function Documentation

byte const* my_vle_decode ( ulong *  value_ptr,
byte const *  vle 
)

Definition at line 97 of file my_vle.c.

00098 {
00099   ulong result= 0;
00100   my_size_t cnt= 1;
00101 
00102   do
00103   {
00104     result<<= 7;
00105     result|= (*vle & 0x7F);
00106   }
00107   while ((*vle++ & 0x80) && ++cnt <= sizeof(*result_ptr) + 1);
00108 
00109   if (cnt <= sizeof(*result_ptr) + 1)
00110     *result_ptr= result;
00111 
00112   return vle;
00113 }

byte* my_vle_encode ( byte *  vle,
my_size_t  max,
ulong  value 
)

Definition at line 47 of file my_vle.c.

References buf, and my_vle_sizeof.

00048 {
00049   byte buf[my_vle_sizeof(n)];
00050   byte *ptr= buf;
00051   my_size_t len;
00052 
00053   do
00054   {
00055     *ptr++= (n & 0x7F);
00056     n>>= 7;
00057   }
00058   while (n > 0);
00059 
00060   len= ptr - buf;
00061   
00062   if (len <= max)
00063   {
00064     /*
00065       The bytes are stored in reverse order in 'buf'. Let's write them
00066       in correct order to the output buffer and set the MSB at the
00067       same time.
00068     */
00069     while (ptr-- > buf)
00070     {
00071       byte v= *ptr;
00072       if (ptr > buf)
00073         v|= 0x80;
00074       *out++= v;
00075     }
00076   }
00077 
00078   return out;
00079 }

Generated on Sat Sep 9 01:43:08 2006 for MySQL 5.1 by  doxygen 1.4.7