<?php
define('INT_SIGNED', 1);
define('INT_LE', 2);
function is32Bit()
{
// This is for max compatibility:
// PHP_INT_MAX doesn't exist in PHP4
// current() *requires* a reference in PHP <5.1.0 (except 4.4.1, dafuq)
$test = unpack('N', "\xFF\xFF\xFF\xFF");
return current($test) === -1;
}
function unpack_int32($str, $flags = 0)
{
// Make sure data is sane
$str = (string) $str;
$length = strlen($str);
if ($length < 4) {
return false;
} else if ($length > 4) {
$str = substr($str, 0, 4);
}
// Normalize to big endian and unpack to int32
if ($flags & INT_LE) {
$str = strrev($str);
}
$result = unpack('N', $str);
$result = current($result);
// Sign and word size info
$signBit = (bool) ($result & 0x80000000);
$isSigned = (bool) ($flags & INT_SIGNED);
$is32bit = is32Bit();
if ($signBit && $isSigned && !$is32bit) {
// Left pad with set bits for negative numbers on 64-bit
$result = (0x00000000FFFFFFFF << 32) | $result;
} else if ($signBit && !$isSigned && $is32bit) {
// Convert int32 to unsigned float
$result = (($result & 0x7FFFFFFF) * 2) + ~$result + 1;
}
return $result;
}
function unpack_int64($str, $flags = 0)
{
// Make sure data is sane
$str = (string) $str;
$length = strlen($str);
if ($length < 8) {
return false;
} else if ($length > 8) {
$str = substr($str, 0, 8);
}
// Normalize to big endian and unpack to int32s
if ($flags & INT_LE) {
$str = strrev($str);
}
$int32s = array_values(unpack('N*', $str));
// Sign and word size info
$signBit = (bool) ($int32s[0] & 0x80000000);
$isSigned = (bool) ($flags & INT_SIGNED);
$is32bit = is32Bit();
if ($is32bit) {
if ($int32s[1] & 0x80000000) {
// Convert second int32 to unsigned float
$int32s[1] = (($int32s[1] & 0x7FFFFFFF) * 2) + ~$int32s[1] + 1;
}
if ($isSigned && $signBit) {
// Negative
$result = ($int32s[0] * pow(2, 32)) + $int32s[1];
} else {
// Positive
if ($signBit) {
// Convert first int32 to unsigned float
$int32s[0] = (($int32s[0] & 0x7FFFFFFF) * 2) + ~$int32s[0] + 1;
}
$result = ($int32s[0] * pow(2, 32)) + $int32s[1];
}
} else {
// Combine int32s into int64
$result = ($int32s[0] << 32) | $int32s[1];
if ($signBit && !$isSigned) {
// Convert to negative
$result = (($result & 0x7FFFFFFFFFFFFFFF) * 2) + ~$result + 1;
}
}
return $result;
}
echo "int32:\n";
printf("%f\n", unpack_int32("\xFF\xFC\x00\x80"));
printf("%f\n", unpack_int32("\xFF\xFC\x00\x80", INT_SIGNED));
printf("%f\n", unpack_int32("\xFF\xFC\x00\x80", INT_LE));
printf("%f\n", unpack_int32("\xFF\xFC\x00\x80", INT_LE | INT_SIGNED));
echo "\n";
echo "int64:\n";
printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x80"));
printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x80", INT_SIGNED));
printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x80", INT_LE));
printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x80", INT_LE | INT_SIGNED));
- Output for git.master, git.master_jit, rfc.property-hooks
- int32:
4294705280.000000
-262016.000000
2147548415.000000
-2147418881.000000
int64:
18446744056529682432.000000
-17179869056.000000
9223372041099411456.000000
-9223372032610140160.000000
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