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Функция получения изображения из .bmp файлов для дальнейшего ресайза, конвертации и т.д

function imageCreateFromBMP($filename) {  
    if (! $f1 = fopen($filename,"rb"))
        return false; 

    $FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14)); 
    if ($FILE['file_type'] != 19778)
        return false; 

    $BMP = unpack(
    'Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'. 
    '/Vcompression/Vsize_bitmap/Vhoriz_resolution'. 
    '/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40)); 

    $BMP['colors'] = pow(2,$BMP['bits_per_pixel']); 
    
    if ($BMP['size_bitmap'] == 0)
        $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset']; 
        
    $BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8; 
    $BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']); 
    $BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4); 
    $BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4); 
    $BMP['decal'] = 4-(4*$BMP['decal']); 
    
    if ($BMP['decal'] == 4)
        $BMP['decal'] = 0; 

    $PALETTE = array(); 

    if ($BMP['colors'] < 16777216) { 
        $PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4)); 
    } 

    $IMG = fread($f1,$BMP['size_bitmap']); 
    $VIDE = chr(0); 

    $res = imagecreatetruecolor($BMP['width'],$BMP['height']); 
    $P = 0; 
    $Y = $BMP['height']-1; 
    while ($Y >= 0) { 
        $X=0; 
        while ($X < $BMP['width']) { 
            if ($BMP['bits_per_pixel'] == 24) 
                $COLOR = unpack("V",substr($IMG,$P,3).$VIDE); 
            elseif ($BMP['bits_per_pixel'] == 16) {   
                $COLOR = unpack("n",substr($IMG,$P,2)); 
                $COLOR[1] = $PALETTE[$COLOR[1]+1]; 
            } elseif ($BMP['bits_per_pixel'] == 8) {   
                $COLOR = unpack("n",$VIDE.substr($IMG,$P,1)); 
                $COLOR[1] = $PALETTE[$COLOR[1]+1]; 
            } elseif ($BMP['bits_per_pixel'] == 4) { 
                $COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1)); 
                if (($P*2)%2 == 0)
                    $COLOR[1] = ($COLOR[1] >> 4);
                else
                    $COLOR[1] = ($COLOR[1] & 0x0F); 
                    
                $COLOR[1] = $PALETTE[$COLOR[1]+1]; 
            } elseif ($BMP['bits_per_pixel'] == 1) { 
                $COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1)); 
                if     (($P*8)%8 == 0) $COLOR[1] =  $COLOR[1]        >>7; 
                elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6; 
                elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5; 
                elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4; 
                elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3; 
                elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2; 
                elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1; 
                elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1); 
                
                $COLOR[1] = $PALETTE[$COLOR[1]+1]; 
            } else 
                return FALSE; 

            imagesetpixel($res,$X,$Y,$COLOR[1]); 
            $X++; 
            $P += $BMP['bytes_per_pixel']; 
        } 

        $Y--; 
        $P+=$BMP['decal']; 
    } 

    fclose($f1); 

    return $res; 
}