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<?php
if (!function_exists('imagecreatefrombmp')) {
function imagecreatefrombmp($filename_or_stream_or_binary)
{
return elFinderLibGdBmp::load($filename_or_stream_or_binary);
}
}
class elFinderLibGdBmp
{
public static function load($filename_or_stream_or_binary)
{
if (is_resource($filename_or_stream_or_binary)) {
return self::loadFromStream($filename_or_stream_or_binary);
} else if (is_string($filename_or_stream_or_binary) && strlen($filename_or_stream_or_binary) >= 26) {
$bfh = unpack("vtype/Vsize", $filename_or_stream_or_binary);
if ($bfh["type"] == 0x4d42 && ($bfh["size"] == 0 || $bfh["size"] == strlen($filename_or_stream_or_binary))) {
return self::loadFromString($filename_or_stream_or_binary);
}
}
return self::loadFromFile($filename_or_stream_or_binary);
}
public static function loadFromFile($filename)
{
$fp = fopen($filename, "rb");
if ($fp === false) {
return false;
}
$bmp = self::loadFromStream($fp);
fclose($fp);
return $bmp;
}
public static function loadFromString($str)
{
$fp = fopen("php://memory", "r+b");
if ($fp === false) {
return false;
}
if (fwrite($fp, $str) != strlen($str)) {
fclose($fp);
return false;
}
if (fseek($fp, 0) === -1) {
fclose($fp);
return false;
}
$bmp = self::loadFromStream($fp);
fclose($fp);
return $bmp;
}
public static function loadFromStream($stream)
{
$buf = fread($stream, 14);
if ($buf === false) {
return false;
}
if ($buf[0] != 'B' || $buf[1] != 'M') {
return false;
}
$bitmap_file_header = unpack(
"vtype/" .
"Vsize/" .
"vreserved1/" .
"vreserved2/" .
"Voffbits", $buf
);
return self::loadFromStreamAndFileHeader($stream, $bitmap_file_header);
}
public static function loadFromStreamAndFileHeader($stream, array $bitmap_file_header)
{
if ($bitmap_file_header["type"] != 0x4d42) {
return false;
}
$buf = fread($stream, 4);
if ($buf === false) {
return false;
}
list(, $header_size) = unpack("V", $buf);
if ($header_size == 12) {
$buf = fread($stream, $header_size - 4);
if ($buf === false) {
return false;
}
extract(unpack(
"vwidth/" .
"vheight/" .
"vplanes/" .
"vbit_count", $buf
));
$clr_used = $clr_important = $alpha_mask = $compression = 0;
$red_mask = 0x00ff0000;
$green_mask = 0x0000ff00;
$blue_mask = 0x000000ff;
} else if (124 < $header_size || $header_size < 40) {
return false;
} else {
$buf = fread($stream, 36);
if ($buf === false) {
return false;
}
extract(unpack(
"Vwidth/" .
"Vheight/" .
"vplanes/" .
"vbit_count/" .
"Vcompression/" .
"Vsize_image/" .
"Vx_pels_per_meter/" .
"Vy_pels_per_meter/" .
"Vclr_used/" .
"Vclr_important", $buf
));
if ($width & 0x80000000) {
$width = -(~$width & 0xffffffff) - 1;
}
if ($height & 0x80000000) {
$height = -(~$height & 0xffffffff) - 1;
}
if ($x_pels_per_meter & 0x80000000) {
$x_pels_per_meter = -(~$x_pels_per_meter & 0xffffffff) - 1;
}
if ($y_pels_per_meter & 0x80000000) {
$y_pels_per_meter = -(~$y_pels_per_meter & 0xffffffff) - 1;
}
if ($bitmap_file_header["size"] != 0) {
$colorsize = $bit_count == 1 || $bit_count == 4 || $bit_count == 8 ? ($clr_used ? $clr_used : pow(2, $bit_count)) << 2 : 0;
$bodysize = $size_image ? $size_image : ((($width * $bit_count + 31) >> 3) & ~3) * abs($height);
$calcsize = $bitmap_file_header["size"] - $bodysize - $colorsize - 14;
if ($header_size < $calcsize && 40 <= $header_size && $header_size <= 124) {
$header_size = $calcsize;
}
}
if ($header_size - 40 > 0) {
$buf = fread($stream, $header_size - 40);
if ($buf === false) {
return false;
}
extract(unpack(
"Vred_mask/" .
"Vgreen_mask/" .
"Vblue_mask/" .
"Valpha_mask", $buf . str_repeat("\x00", 120)
));
} else {
$alpha_mask = $red_mask = $green_mask = $blue_mask = 0;
}
if (
($bit_count == 16 || $bit_count == 24 || $bit_count == 32) &&
$compression == 0 &&
$red_mask == 0 && $green_mask == 0 && $blue_mask == 0
) {
switch ($bit_count) {
case 16:
$red_mask = 0x7c00;
$green_mask = 0x03e0;
$blue_mask = 0x001f;
break;
case 24:
case 32:
$red_mask = 0x00ff0000;
$green_mask = 0x0000ff00;
$blue_mask = 0x000000ff;
break;
}
}
}
if (
($width == 0) ||
($height == 0) ||
($planes != 1) ||
(($alpha_mask & $red_mask) != 0) ||
(($alpha_mask & $green_mask) != 0) ||
(($alpha_mask & $blue_mask) != 0) ||
(($red_mask & $green_mask) != 0) ||
(($red_mask & $blue_mask) != 0) ||
(($green_mask & $blue_mask) != 0)
) {
return false;
}
if ($compression == 4 || $compression == 5) {
$buf = stream_get_contents($stream, $size_image);
if ($buf === false) {
return false;
}
return imagecreatefromstring($buf);
}
$line_bytes = (($width * $bit_count + 31) >> 3) & ~3;
$lines = abs($height);
$y = $height > 0 ? $lines - 1 : 0;
$line_step = $height > 0 ? -1 : 1;
if ($bit_count == 1 || $bit_count == 4 || $bit_count == 8) {
$img = imagecreate($width, $lines);
$palette_size = $header_size == 12 ? 3 : 4;
$colors = $clr_used ? $clr_used : pow(2, $bit_count);
$palette = array();
for ($i = 0; $i < $colors; ++$i) {
$buf = fread($stream, $palette_size);
if ($buf === false) {
imagedestroy($img);
return false;
}
extract(unpack("Cb/Cg/Cr/Cx", $buf . "\x00"));
$palette[] = imagecolorallocate($img, $r, $g, $b);
}
$shift_base = 8 - $bit_count;
$mask = ((1 << $bit_count) - 1) << $shift_base;
if ($compression == 1 || $compression == 2) {
$x = 0;
$qrt_mod2 = $bit_count >> 2 & 1;
for (; ;) {
if ($x < -1 || $x > $width || $y < -1 || $y > $height) {
imagedestroy($img);
return false;
}
$buf = fread($stream, 1);
if ($buf === false) {
imagedestroy($img);
return false;
}
switch ($buf) {
case "\x00":
$buf = fread($stream, 1);
if ($buf === false) {
imagedestroy($img);
return false;
}
switch ($buf) {
case "\x00":
$y += $line_step;
$x = 0;
break;
case "\x01":
$y = 0;
$x = 0;
break 3;
case "\x02":
$buf = fread($stream, 2);
if ($buf === false) {
imagedestroy($img);
return false;
}
list(, $xx, $yy) = unpack("C2", $buf);
$x += $xx;
$y += $yy * $line_step;
break;
default:
list(, $pixels) = unpack("C", $buf);
$bytes = ($pixels >> $qrt_mod2) + ($pixels & $qrt_mod2);
$buf = fread($stream, ($bytes + 1) & ~1);
if ($buf === false) {
imagedestroy($img);
return false;
}
for ($i = 0, $pos = 0; $i < $pixels; ++$i, ++$x, $pos += $bit_count) {
list(, $c) = unpack("C", $buf[$pos >> 3]);
$b = $pos & 0x07;
imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]);
}
break;
}
break;
default:
$buf2 = fread($stream, 1);
if ($buf2 === false) {
imagedestroy($img);
return false;
}
list(, $size, $c) = unpack("C2", $buf . $buf2);
for ($i = 0, $pos = 0; $i < $size; ++$i, ++$x, $pos += $bit_count) {
$b = $pos & 0x07;
imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]);
}
break;
}
}
} else {
for ($line = 0; $line < $lines; ++$line, $y += $line_step) {
$buf = fread($stream, $line_bytes);
if ($buf === false) {
imagedestroy($img);
return false;
}
$pos = 0;
for ($x = 0; $x < $width; ++$x, $pos += $bit_count) {
list(, $c) = unpack("C", $buf[$pos >> 3]);
$b = $pos & 0x7;
imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]);
}
}
}
} else {
$img = imagecreatetruecolor($width, $lines);
imagealphablending($img, false);
if ($alpha_mask) {
imagesavealpha($img, true);
}
$pixel_step = $bit_count >> 3;
$alpha_max = $alpha_mask ? 0x7f : 0x00;
$alpha_mask_r = $alpha_mask ? 1 / $alpha_mask : 1;
$red_mask_r = $red_mask ? 1 / $red_mask : 1;
$green_mask_r = $green_mask ? 1 / $green_mask : 1;
$blue_mask_r = $blue_mask ? 1 / $blue_mask : 1;
for ($line = 0; $line < $lines; ++$line, $y += $line_step) {
$buf = fread($stream, $line_bytes);
if ($buf === false) {
imagedestroy($img);
return false;
}
$pos = 0;
for ($x = 0; $x < $width; ++$x, $pos += $pixel_step) {
list(, $c) = unpack("V", substr($buf, $pos, $pixel_step) . "\x00\x00");
$a_masked = $c & $alpha_mask;
$r_masked = $c & $red_mask;
$g_masked = $c & $green_mask;
$b_masked = $c & $blue_mask;
$a = $alpha_max - ((($a_masked << 7) - $a_masked) * $alpha_mask_r);
$r = (($r_masked << 8) - $r_masked) * $red_mask_r;
$g = (($g_masked << 8) - $g_masked) * $green_mask_r;
$b = (($b_masked << 8) - $b_masked) * $blue_mask_r;
imagesetpixel($img, $x, $y, ($a << 24) | ($r << 16) | ($g << 8) | $b);
}
}
imagealphablending($img, true);
}
return $img;
}
}