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<?php
/*
function writeInta( $iIn )
{
$ret = "";
if( $iIn < 0 )
{
$iIn = -$iIn;
$b = ($iIn&0x3f);
if( $iIn > $b )
$b |= 0x80 | 0x40;
else
$b |= 0x40;
}
else
{
$b = ($iIn&0x3f);
if( $iIn > $b )
$b |= 0x80;
}
$ret .= chr( $b );
$iIn = $iIn >> 6;
while( $iIn > 0 )
{
$b = ($iIn&0x7f);
if( $iIn > $b )
$b |= 0x80;
$ret .= chr( $b );
$iIn = $iIn >> 7;
}
return $ret;
} */
function writeInt( $iIn )
{
$ret = "";
if( gmp_cmp( $iIn, 0 ) < 0 )
{
$iIn = gmp_mul( $iIn, -1 );
$b = gmp_intval( gmp_and( $iIn, 0x3f ) );
if( gmp_cmp( $iIn, $b ) > 0 )
$b |= 0x80 | 0x40;
else
$b |= 0x40;
}
else
{
$b = gmp_intval( gmp_and( $iIn, 0x3f ) );
if( gmp_cmp( $iIn, $b ) > 0 )
$b |= 0x80;
}
$ret .= chr( $b );
$iIn = gmp_div( $iIn, 64 );
while( gmp_cmp( $iIn, 0 ) > 0 )
{
$b = gmp_intval( gmp_and( $iIn, 0x7f ) );
if( gmp_cmp( $iIn, $b ) > 0 )
$b |= 0x80;
$ret .= chr( $b );
$iIn = gmp_div( $iIn, 128 );
}
return $ret;
}
function readInt( $sIn, &$pos )
{
$neg = false;
$b = ord($sIn[$pos++]);
if( ($b&0x40) == 0x40 )
$neg = true;
$iOut = gmp_init( $b&0x3f );
$mult = gmp_init( 64 );
while( ($b&0x80) )
{
$b = ord($sIn[$pos++]);
$iOut = gmp_or( $iOut, gmp_mul( $b&0x7f, $mult ) );
$mult = gmp_mul( $mult, 128 );
}
if( $neg == true )
$iOut = gmp_mul( $iOut, -1 );
return $iOut;
}
function teststr( $str )
{
$pos = 0;
$enc = writeInt( $str );
$out = gmp_strval( readInt( $enc, $pos ) );
print( $str . " => " . $out );
if( $out == $str )
print(", correct.\n");
else
print(", incorrect.\n");
}
//print( bin2hex( writeInt("3898993999921") ) . "\n" );
teststr("-7");
?>
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