mirror of
https://github.com/php/php-src.git
synced 2024-09-24 19:37:26 +00:00
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
|
|
This file is public domain and comes with NO WARRANTY of any kind */
|
|
|
|
/* Written by Sinisa Milivojevic <sinisa@coresinc.com> */
|
|
|
|
#include <global.h>
|
|
#ifdef HAVE_COMPRESS
|
|
#include <my_sys.h>
|
|
#include <zlib.h>
|
|
|
|
/*
|
|
** This replaces the packet with a compressed packet
|
|
** Returns 1 on error
|
|
** *complen is 0 if the packet wasn't compressed
|
|
*/
|
|
|
|
my_bool my_compress(byte *packet, ulong *len, ulong *complen)
|
|
{
|
|
if (*len < MIN_COMPRESS_LENGTH)
|
|
*complen=0;
|
|
else
|
|
{
|
|
byte *compbuf=my_compress_alloc(packet,len,complen);
|
|
if (!compbuf)
|
|
return *complen ? 0 : 1;
|
|
memcpy(packet,compbuf,*len);
|
|
my_free(compbuf,MYF(MY_WME)); }
|
|
return 0;
|
|
}
|
|
|
|
|
|
byte *my_compress_alloc(const byte *packet, ulong *len, ulong *complen)
|
|
{
|
|
byte *compbuf;
|
|
*complen = *len * 120 / 100 + 12;
|
|
if (!(compbuf = (byte *) my_malloc(*complen,MYF(MY_WME))))
|
|
return 0; /* Not enough memory */
|
|
if (compress((Bytef*) compbuf,(ulong *) complen, (Bytef*) packet,
|
|
(uLong) *len ) != Z_OK)
|
|
{
|
|
my_free(compbuf,MYF(MY_WME));
|
|
return 0;
|
|
}
|
|
if (*complen >= *len)
|
|
{
|
|
*complen=0;
|
|
my_free(compbuf,MYF(MY_WME));
|
|
return 0;
|
|
}
|
|
swap(ulong,*len,*complen); /* *len is now packet length */
|
|
return compbuf;
|
|
}
|
|
|
|
|
|
my_bool my_uncompress (byte *packet, ulong *len, ulong *complen)
|
|
{
|
|
if (*complen) /* If compressed */
|
|
{
|
|
byte *compbuf = (byte *) my_malloc (*complen,MYF(MY_WME));
|
|
if (!compbuf)
|
|
return 1; /* Not enough memory */
|
|
if (uncompress((Bytef*) compbuf, complen, (Bytef*) packet, *len) != Z_OK)
|
|
{ /* Probably wrong packet */
|
|
my_free (compbuf,MYF(MY_WME));
|
|
return 1;
|
|
}
|
|
*len = *complen;
|
|
memcpy(packet,compbuf,*len);
|
|
my_free(compbuf,MYF(MY_WME));
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_COMPRESS */
|