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wm_library.c
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wm_library.c
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int request_initialise_wm();
int request_update_wm(int, char *, int);
int request_retrieval_wm(int, int *);
int request_release_wm(int);
static int watermark_value;
int request_initialise_wm()
{
watermark_value = 0;
return 0;
}
int request_update_wm(int wmid, char *buf, int length)
{
int i;
if(wmid != 0)
{
return 1;
}
for(i = 0; i < length; i ++)
{
watermark_value <<= 1;
if(buf[i] == '0')
watermark_value &= (~0x1ULL);
else if (buf[i] == '1')
watermark_value |= 0x1;
else
return 1;
}
return 0;
}
int request_retrieval_wm(int wmid, int *val)
{
if(wmid != 0)
{
return -1;
}
*val = watermark_value;
return 0;
}
int request_release_wm(int wmid)
{
if(wmid != 0)
{
return -1;
}
watermark_value = 0;
return 0;
}