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✏️ Editing: image_details.php

<?php

$orig_srcpath = '../tests/tiger.png';      // as specified in your file (could be full URL)
$file = 'http://127.0.0.1/MPDF1.com/common/mpdf/tests/tiger.png'; // Full URL
$fileIsLocal = true;         // is the file in the same domain?
//======================================================================

$ppUx = 0;
$type = '';
$data = '';

echo 'File: ' . $orig_srcpath . ' ';
echo 'Full File URL: ' . $file . ' ';
if ($orig_srcpath && $fileIsLocal && $check = @fopen($orig_srcpath, "rb")) {
 fclose($check);
 $file = $orig_srcpath;
 $data = file_get_contents($file);
 $type = _imageTypeFromString($data);
 echo 'File accessed using fopen on $orig_srcpath' . ' ';
}
if (!$data && $check = @fopen($file, "rb")) {
 fclose($check);
 $data = file_get_contents($file);
 $type = _imageTypeFromString($data);
 echo 'File accessed using fopen on $file' . ' ';
}
if ((!$data || !$type) && !ini_get('allow_url_fopen')) { // only worth trying if remote file and !ini_get('allow_url_fopen')
 file_get_contents_by_socket($file, $data); // needs full url?? even on local (never needed for local)
 if ($data) {
 $type = _imageTypeFromString($data);
 }
 echo 'File accessed using socket ' . ' ';
}
if ((!$data || !$type) && !ini_get('allow_url_fopen') && function_exists("curl_init")) {
 file_get_contents_by_curl($file, $data); // needs full url?? even on local (never needed for local)
 if ($data) {
 $type = _imageTypeFromString($data);
 }
 echo 'File accessed using cURL ' . ' ';
}

if (!$data) {
 echo 'Could not access image file' . ' ';
 exit;
}

echo 'Image type determined: ' . strtoupper($type) . ' ';

// JPEG
if ($type == 'jpeg' || $type == 'jpg') {
 $hdr = _jpgHeaderFromString($data);
 if (!$hdr) {
 echo 'Error parsing JPG header' . ' ';
 exit;
 }
 $a = _jpgDataFromHeader($hdr);
 $channels = intval($a[4]);
 echo 'Width: ' . $a[0] . ' ';
 echo 'Height: ' . $a[1] . ' ';
 echo 'Colorspace: ' . $a[2] . ' ';
 echo 'BPC (bits per channel): ' . $a[3] . ' ';
 echo 'Channels: ' . $channels . ' ';

$j = strpos($data, 'JFIF');
 if ($j) {
 //Read resolution
 $unitSp = ord(substr($data, ($j + 7), 1));
 if ($unitSp > 0) {
 $ppUx = _twobytes2int(substr($data, ($j + 8), 2)); // horizontal pixels per meter, usually set to zero
 if ($unitSp == 2) { // = dots per cm (if == 1 set as dpi)
 $ppUx = round($ppUx / 10 * 25.4);
 }
 }
 echo 'Resolution ppUx: ' . $ppUx . ' ';
 } else
 echo 'JFIF not found in header' . ' ';

// mPDF 6 ICC profile
 $offset = 0;
 $icc = array();
 while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
 // get ICC sequence length
 $length = _twobytes2int(substr($data, ($pos - 2), 2)) - 16;
 $sn = max(1, ord($data[($pos + 12)]));
 $nom = max(1, ord($data[($pos + 13)]));
 $icc[($sn - 1)] = substr($data, ($pos + 14), $length);
 $offset = ($pos + 14 + $length);
 }
 // order and compact ICC segments
 if (count($icc) > 0) {
 echo 'ICC profile present' . ' ';
 ksort($icc);
 $icc = implode('', $icc);
 if (substr($icc, 36, 4) != 'acsp') {
 // invalid ICC profile
 echo 'ICC profile INVALID (no acsp flag)' . ' ';
 }
 $input = substr($icc, 16, 4);
 $output = substr($icc, 20, 4);
 echo 'ICC profile Input: ' . $input . ' ';
 echo 'ICC profile Output: ' . $output . ' ';
 // Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
 if ($input != 'RGB ' || $output != 'XYZ ') {
 echo 'ICC profile ignored by mPDF' . ' ';
 }
 }
}

// PNG
else if ($type == 'png') {
 //Check signature
 if (substr($data, 0, 8) != chr(137) . 'PNG' . chr(13) . chr(10) . chr(26) . chr(10)) {
 echo 'Error parsing PNG identifier ';
 exit;
 }
 //Read header chunk
 if (substr($data, 12, 4) != 'IHDR') {
 echo 'Incorrect PNG file (no IHDR block found) ';
 exit;
 }

$w = _fourbytes2int(substr($data, 16, 4));
    $h = _fourbytes2int(substr($data, 20, 4));
    $bpc = ord(substr($data, 24, 1));
    $errpng = false;
    $pngalpha = false;
    $channels = 0;

echo 'Width: ' . $w . ' ';
 echo 'Height: ' . $h . ' ';
 echo 'BPC (bits per channel): ' . $bpc . ' ';

$ct = ord(substr($data, 25, 1));
    if ($ct == 0) {
        $colspace = 'DeviceGray';
        $channels = 1;
    } elseif ($ct == 2) {
        $colspace = 'DeviceRGB';
        $channels = 3;
    } elseif ($ct == 3) {
        $colspace = 'Indexed';
        $channels = 1;
    } elseif ($ct == 4) {
        $colspace = 'DeviceGray';
        $channels = 1;
        $errpng = 'alpha channel';
        $pngalpha = true;
    } else {
        $colspace = 'DeviceRGB';
        $channels = 3;
        $errpng = 'alpha channel';
        $pngalpha = true;
    }

echo 'Colorspace: ' . $colspace . ' ';
 echo 'Channels: ' . $channels . ' ';
 if ($pngalpha)
 echo 'Alpha channel detected' . ' ';

if ($ct < 4 && strpos($data, 'tRNS') !== false) {
 echo 'Transparency detected' . ' ';
 $errpng = 'transparency';
 $pngalpha = true;
 }

if ($ct == 3 && strpos($data, 'iCCP') !== false) {
 echo 'Indexed plus ICC' . ' ';
 $errpng = 'indexed plus ICC';
 }

if (ord(substr($data, 26, 1)) != 0) {
 echo 'compression method not set to zero ';
 $errpng = 'compression method';
 } // only 0 should be specified
 if (ord(substr($data, 27, 1)) != 0) {
 echo 'filter method not set to zero ';
 $errpng = 'filter method';
 } // only 0 should be specified
 if (ord(substr($data, 28, 1)) != 0) {
 echo 'interlaced file not set to zero ';
 $errpng = 'interlaced file';
 }

$j = strpos($data, 'pHYs');
 if ($j) {
 //Read resolution
 $unitSp = ord(substr($data, ($j + 12), 1));
 if ($unitSp == 1) {
 $ppUx = _fourbytes2int(substr($data, ($j + 4), 4)); // horizontal pixels per meter, usually set to zero
 $ppUx = round($ppUx / 1000 * 25.4);
 }
 echo 'Resolution ppUx: ' . $ppUx . ' ';
 }

// mPDF 6 Gamma correction
    $gamma_correction = 0;
    $gAMA = 0;
    $j = strpos($data, 'gAMA');
    if ($j && strpos($data, 'sRGB') === false) { // sRGB colorspace - overrides gAMA
        $gAMA = _fourbytes2int(substr($data, ($j + 4), 4)); // Gamma value times 100000
        $gAMA /= 100000;
    }

if ($gAMA) {
        $gamma_correction = 1 / $gAMA;
    }

// Don't need to apply gamma correction if == default i.e. 2.2
 if ($gamma_correction > 2.15 && $gamma_correction < 2.25) {
 $gamma_correction = 0;
 }

if ($gamma_correction) {
 echo 'Gamma correction detected' . ' ';
 }

// NOT supported at present
 if (strpos($data, 'sRGB') !== false)
 echo 'sRGB colorspace - NOT supported at present' . ' ';
 if (strpos($data, 'cHRM') !== false)
 echo 'Chromaticity and Whitepoint - NOT supported at present' . ' ';

if (($errpng || $pngalpha || $gamma_correction)) {
 if (function_exists('gd_info')) {
 $gd = gd_info();
 } else {
 $gd = array();
 }
 if (!isset($gd['PNG Support'])) {
 echo 'GD library required for PNG image (' . $errpng . ')' . ' ';
 }
 $im = imagecreatefromstring($data);

if (!$im) {
 echo 'Error creating GD image from PNG file (' . $errpng . ')' . ' ';
 }
 $w = imagesx($im);
 $h = imagesy($im);
 if ($im) {

// Alpha channel set (including using tRNS for Paletted images)
 if ($pngalpha) {
 echo 'Alpha channel will be used by mPDF (including when tRNS present in Paletted images) ';
 if ($colspace == 'Indexed') {
 echo '...Generating Alpha channel values from tRNS (Indexed) ';
 } else if ($ct === 0 || $ct == 2) {
 echo '...Generating Alpha channel values from tRNS (non-Indexed) ';
 } else {
 echo '...Extracting Alpha channel ';
 }
 } else { // No alpha/transparency set (but cannot read directly because e.g. bit-depth != 8, interlaced etc)
 echo 'No alpha/transparency set (but cannot read directly because e.g. bit-depth != 8, interlaced etc) ';

// ICC profile
 $icc = false;
 $p = strpos($data, 'iCCP');
 if ($p && $colspace == "Indexed") {
 $p += 4;
 $n = _fourbytes2int(substr($data, ($p - 8), 4));
 $nullsep = strpos(substr($data, $p, 80), chr(0));
 $icc = substr($data, ($p + $nullsep + 2), ($n - ($nullsep + 2)));
 // Test if file is gzcompressed
 if (ord(substr($str, 0, 1)) == 0x1f && ord(substr($str, 1, 1)) == 0x8b) {
 $icc = @gzuncompress($icc); // Ignored if fails
 }
 if ($icc) {
 echo 'ICC profile present' . ' ';
 if (substr($icc, 36, 4) != 'acsp') {
 echo 'ICC profile INVALID (no acsp flag)' . ' ';
 $icc = false;
 } // invalid ICC profile
 else {
 $input = substr($icc, 16, 4);
 $output = substr($icc, 20, 4);
 echo 'ICC profile Input: ' . $input . ' ';
 echo 'ICC profile Output: ' . $output . ' ';
 // Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
 if ($input != 'RGB ' || $output != 'XYZ ') {
 $icc = false;
 echo 'ICC profile ignored by mPDF' . ' ';
 }
 }
 }
 // Convert to RGB colorspace so can use ICC Profile
 if ($icc) {
 echo 'ICC profile and Indexed colorspace both present - need to Convert to RGB colorspace so can use ICC Profile ';
 }
 }
 }
 }
 echo 'PNG Image parsed on second pass' . ' ';

// SECOND PASS
 imagealphablending($im, false);
 imagesavealpha($im, false);
 imageinterlace($im, false);
 ob_start();
 $check = @imagepng($im);
 if (!$check) {
 echo 'Error creating temporary image object whilst using GD library to parse PNG image' . ' ';
 }
 $data = ob_get_contents();
 ob_end_clean();
 if (!$data) {
 echo 'Error parsing temporary file image object created with GD library to parse PNG image' . ' ';
 }
 imagedestroy($im);

//Check signature
 if (substr($data, 0, 8) != chr(137) . 'PNG' . chr(13) . chr(10) . chr(26) . chr(10)) {
 echo 'Error parsing PNG identifier ';
 exit;
 }
 //Read header chunk
 if (substr($data, 12, 4) != 'IHDR') {
 echo 'Incorrect PNG file (no IHDR block found) ';
 exit;
 }

$w = _fourbytes2int(substr($data, 16, 4));
        $h = _fourbytes2int(substr($data, 20, 4));
        $bpc = ord(substr($data, 24, 1));
        $errpng = false;
        $pngalpha = false;
        $channels = 0;

echo 'Width: ' . $w . ' ';
 echo 'Height: ' . $h . ' ';
 echo 'BPC (bits per channel): ' . $bpc . ' ';

$ct = ord(substr($data, 25, 1));
        if ($ct == 0) {
            $colspace = 'DeviceGray';
            $channels = 1;
        } elseif ($ct == 2) {
            $colspace = 'DeviceRGB';
            $channels = 3;
        } elseif ($ct == 3) {
            $colspace = 'Indexed';
            $channels = 1;
        } elseif ($ct == 4) {
            $colspace = 'DeviceGray';
            $channels = 1;
            $errpng = 'alpha channel';
            $pngalpha = true;
        } else {
            $colspace = 'DeviceRGB';
            $channels = 3;
            $errpng = 'alpha channel';
            $pngalpha = true;
        }

echo 'Colorspace: ' . $colspace . ' ';
 echo 'Channels: ' . $channels . ' ';
 if ($pngalpha)
 echo 'Alpha channel detected' . ' ';

if ($ct < 4 && strpos($data, 'tRNS') !== false) {
 echo 'Transparency detected' . ' ';
 $errpng = 'transparency';
 $pngalpha = true;
 }

if ($ct == 3 && strpos($data, 'iCCP') !== false) {
 echo 'Indexed plus ICC' . ' ';
 $errpng = 'indexed plus ICC';
 }

if (ord(substr($data, 26, 1)) != 0) {
 echo 'compression method not set to zero ';
 $errpng = 'compression method';
 } // only 0 should be specified
 if (ord(substr($data, 27, 1)) != 0) {
 echo 'filter method not set to zero ';
 $errpng = 'filter method';
 } // only 0 should be specified
 if (ord(substr($data, 28, 1)) != 0) {
 echo 'interlaced file not set to zero ';
 $errpng = 'interlaced file';
 }

$j = strpos($data, 'pHYs');
 if ($j) {
 //Read resolution
 $unitSp = ord(substr($data, ($j + 12), 1));
 if ($unitSp == 1) {
 $ppUx = _fourbytes2int(substr($data, ($j + 4), 4)); // horizontal pixels per meter, usually set to zero
 $ppUx = round($ppUx / 1000 * 25.4);
 }
 echo 'Resolution ppUx: ' . $ppUx . ' ';
 }

//Gamma correction
        $gamma_correction = 0;
        $gAMA = 0;
        $j = strpos($data, 'gAMA');
        if ($j && strpos($data, 'sRGB') === false) { // sRGB colorspace - overrides gAMA
            $gAMA = _fourbytes2int(substr($data, ($j + 4), 4)); // Gamma value times 100000
            $gAMA /= 100000;
        }

if ($gAMA) {
            $gamma_correction = 1 / $gAMA;
        }

// Don't need to apply gamma correction if == default i.e. 2.2
 if ($gamma_correction > 2.15 && $gamma_correction < 2.25) {
 $gamma_correction = 0;
 }

if ($gamma_correction) {
 echo 'Gamma correction detected' . ' ';
 }

// NOT supported at present
 if (strpos($data, 'sRGB') !== false)
 echo 'sRGB colorspace - NOT supported at present' . ' ';
 if (strpos($data, 'cHRM') !== false)
 echo 'Chromaticity and Whitepoint - NOT supported at present' . ' ';
 }

else { // PNG image with no need to convert alpha channels, bpc <> 8 etc.
 //Scan chunks looking for palette, transparency and image data
 $pal = '';
 $trns = '';
 $pngdata = '';
 $icc = false;
 $p = 33;
 do {
 $n = _fourbytes2int(substr($data, $p, 4));
 $p += 4;
 $type = substr($data, $p, 4);
 $p += 4;
 if ($type == 'PLTE') {
 //Read palette
 $pal = substr($data, $p, $n);
 $p += $n;
 $p += 4;
 } else if ($type == 'tRNS') {
 //Read transparency info
 $t = substr($data, $p, $n);
 $p += $n;
 if ($ct == 0)
 $trns = array(ord(substr($t, 1, 1)));
 else if ($ct == 2)
 $trns = array(ord(substr($t, 1, 1)), ord(substr($t, 3, 1)), ord(substr($t, 5, 1)));
 else {
 $pos = strpos($t, chr(0));
 if (is_int($pos))
 $trns = array($pos);
 }
 $p += 4;
 }
 else if ($type == 'IDAT') {
 $pngdata .= substr($data, $p, $n);
 $p += $n;
 $p += 4;
 } else if ($type == 'iCCP') {
 $nullsep = strpos(substr($data, $p, 80), chr(0));
 $icc = substr($data, ($p + $nullsep + 2), ($n - ($nullsep + 2)));
 // Test if file is gzcompressed
 if (ord(substr($str, 0, 1)) == 0x1f && ord(substr($str, 1, 1)) == 0x8b) {
 $icc = @gzuncompress($icc); // Ignored if fails
 }
 if ($icc) {
 echo 'ICC profile present' . ' ';
 if (substr($icc, 36, 4) != 'acsp') {
 echo 'ICC profile INVALID (no acsp flag)' . ' ';
 $icc = false;
 } // invalid ICC profile
 else {
 $input = substr($icc, 16, 4);
 $output = substr($icc, 20, 4);
 echo 'ICC profile Input: ' . $input . ' ';
 echo 'ICC profile Output: ' . $output . ' ';
 // Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
 if ($input != 'RGB ' || $output != 'XYZ ') {
 $icc = false;
 echo 'ICC profile ignored by mPDF' . ' ';
 }
 }
 }
 $p += $n;
 $p += 4;
 } else if ($type == 'IEND') {
 break;
 } else if (preg_match('/[a-zA-Z]{4}/', $type)) {
 $p += $n + 4;
 } else {
 echo 'Error parsing PNG image data ';
 }
 } while ($n);
 if (!$pngdata) {
 echo 'Error parsing PNG image data - no IDAT data found ';
 }
 if ($colspace == 'Indexed' && empty($pal)) {
 echo 'Error parsing PNG image data - missing colour palette ';
 }
 echo 'PNG Image parsed directly' . ' ';
 }
}

// GIF
else if ($type == 'gif') {
    
}

// BMP (Windows Bitmap)
else if ($type == 'bmp') {
 
}
// WMF
else if ($type == 'wmf') {
 
}
// UNKNOWN TYPE - try GD imagecreatefromstring
else {
 if (function_exists('gd_info')) {
 $gd = gd_info();
 } else {
 $gd = array();
 }
 if (isset($gd['PNG Support']) && $gd['PNG Support']) {
 $im = @imagecreatefromstring($data);
 if ($im) {
 echo 'Image type not recognised, but image created from file using GD imagecreate' . ' ';
 } else {
 echo 'Error parsing image file - image type not recognised, and not supported by GD imagecreate' . ' ';
 }
 }
}

exit;

//==============================================================

function _fourbytes2int($s) {
 //Read a 4-byte integer from string
 return (ord($s[0]) << 24) + (ord($s[1]) << 16) + (ord($s[2]) << 8) + ord($s[3]);
}

function _twobytes2int($s) { // equivalent to _get_ushort
 //Read a 2-byte integer from string
 return (ord(substr($s, 0, 1)) << 8) + ord(substr($s, 1, 1));
}

function file_get_contents_by_curl($url, &$data) {
    $timeout = 5;
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_NOBODY, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $data = curl_exec($ch);
    curl_close($ch);
}

$getstring = "GET " . $file . " HTTP/1.0 \r\n" .
            "Host: " . $p['host'] . " \r\n" .
            "Connection: close\r\n\r\n";
    fwrite($fh, $getstring);
    // Get rid of HTTP header
    $s = fgets($fh, 1024);
    if (!$s) {
        return false;
    }
    $httpheader .= $s;
    while (!feof($fh)) {
        $s = fgets($fh, 1024);
        if ($s == "\r\n") {
            break;
        }
    }
    $data = '';
    while (!feof($fh)) {
        $data .= fgets($fh, 1024);
    }
    fclose($fh);
}

//==============================================================

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