/
PNG.php
484 lines (480 loc) · 17.7 KB
/
PNG.php
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<?php
/*
IO_PNG class - 2.0.3
(c) 2011/12/30 yoya@awm.jp
*/
if (is_readable('vendor/autoload.php')) {
require 'vendor/autoload.php';
} else {
require_once 'IO/Bit.php';
}
class IO_PNG {
var $_chunkList = null;
var $_pngdata = null;
const SIGNATURE = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
const SIGNATURE_JNG = "\x8B\x4A\x4E\x47\x0D\x0A\x1A\x0A";
function parse($pngdata) {
$bit = new IO_Bit();
$bit->input($pngdata);
$this->_pngdata = $pngdata;
if ($bit->hasNextData(8) === false) {
throw new Exception ("Not PNG FILE (too short)");
}
$signature = $bit->getData(8);
if (($signature != self::SIGNATURE) &&
($signature != self::SIGNATURE_JNG)) {
throw new Exception ("Not PNG,JNG FILE ($signature)");
}
while ($bit->hasNextData(8)) {
list($offset, $dummy) = $bit->getOffset();
$dataSize = $bit->getUI32BE();
$chunkName = $bit->getData(4);
$data = $bit->getData($dataSize);
$crc = $bit->getUI32BE();
$namedata_crc32 = crc32($chunkName.$data);
if ($crc !== $namedata_crc32) {
fprintf(STDERR, "Warning: chunkName:$chunkName crc:$crc namedata_crc32:$namedata_crc32\n");
}
switch ($chunkName) {
case 'IHDR':
$bit_chunk = new IO_Bit();
$bit_chunk->input($data);
$width = $bit_chunk->getUI32BE();
$height = $bit_chunk->getUI32BE();
$bitDepth = $bit_chunk->getUI8();
$colorType = $bit_chunk->getUI8();
$compression = $bit_chunk->getUI8();
$filter = $bit_chunk->getUI8();
$interlace = $bit_chunk->getUI8();
$data = array(
'Width' => $width,
'Height' => $height,
'BitDepth' => $bitDepth,
'ColorType' => $colorType,
'Compression' => $compression,
'Filter' => $filter,
'Interlace' => $interlace,
);
break;
case 'gAMA':
$bit_gama = new IO_Bit();
$bit_gama->input($data);
$gamma = $bit_gama->getUI32BE();
$data = $gamma /100000;
break;
case 'pHYs':
$bit_phys = new IO_Bit();
$bit_phys->input($data);
$data = array(
'PixelsX' => $bit_phys->getUI32BE(),
'PixelsY' => $bit_phys->getUI32BE(),
'UnitSpec' => $bit_phys->getUI8(),
);
break;
case 'iDOT': // apple
$bit_idot = new IO_Bit();
$bit_idot->input($data);
$count = bit_idot->getUI32BE();
$data = array(
"count" => $count,
'reserved' => $bit_idot->getUI32BE(),
'height' => $bit_idot->getUI32BE(),
'chunkSize' => $bit_idot->getUI32BE(),
'entries' => [],
);
for ($i = 1; $i < $count ; $i++) {
$data['entries'][] = array(
'offset' => $bit_idot->getUI32BE(),
'height' => $bit_idot->getUI32BE(),
'idatOffset' => $bit_idot->getUI32BE(),
);
}
break;
case 'PLTE':
case 'tRNS':
case 'IEND':
case 'IDAT':
default:
// $data = $data;
break;
}
list($offset2, $dummy) = $bit->getOffset();
$this->_chunkList []= array('Size' => $dataSize,
'Name' => $chunkName,
'Data' => $data,
'CRC' => $crc,
'_offset' => $offset,
'_length' => $offset2 - $offset);
if ($chunkName === 'IEND') {
break;
}
}
}
static $colorTypeNameTable = array(
0 => 'GRAY',
2 => 'RGB',
3 => 'PALETTE',
4 => 'GRAY_ALPHA',
6 => 'RGB_ALPHA',
);
function dump($opts = Array()) {
if (empty($opts['hexdump']) === false) {
$bitio = new IO_Bit();
$bitio->input($this->_pngdata);
}
$idat_data = '';
$colorType = null;
foreach ($this->_chunkList as $chunk) {
echo "Name:{$chunk['Name']} Size={$chunk['Size']} CRC={$chunk['CRC']}";
if (empty($opts['detail'])) {
if (isset($chunk['Data'])) {
echo " ";
$chunkData = $chunk['Data'];
if (is_array($chunkData)) {
echo "(".implode(",", $chunkData).")";
} else if (is_string($chunk['Data'])) {
if (ctype_print($chunkData)) {
echo "($chunkLen)";
}
} else {
echo "($chunkData)";
}
}
echo PHP_EOL;
continue;
}
echo PHP_EOL;
$data = $chunk['Data'];
switch ($chunk['Name']) {
case 'IHDR':
$colorType = $data['ColorType'];
if (isset(self::$colorTypeNameTable[$colorType])) {
$colorTypeName = self::$colorTypeNameTable[$colorType];
} else {
$colorTypeName = "UnknownType";
}
echo " Width:{$data['Width']} Height:{$data['Height']} BitDepth:{$data['BitDepth']}";
echo " ColorType:{$data['ColorType']}($colorTypeName)";
echo " Compression:{$data['Compression']} Filter:{$data['Filter']} Interlate:{$data['Interlace']}";
echo "\n";
break;
case 'gAMA':
$gamma = $data;
printf(" Gamma:%.5f\n", $gamma);
break;
case 'pHYs':
$pixelsX = $data['PixelsX'];
$pixelsY = $data['PixelsY'];
$unitSpec = $data['UnitSpec'];
$unitSpecName = ["Unknown", "Metre"][$unitSpec];
printf(" pixelsX:%d, pixelsY:%d, unitSpecName:%s\n",
$pixelsX, $pixelsY, $unitSpecName);
if ($unitSpec === 1) { // Metre
if ($pixelsX === $pixelsY) {
printf(" (inch pixelsX,pixelsY:%d)\n",
$pixelsX / 39.37);
} else {
printf(" (inch pixelsX:%.3f, pixelsY:%.3f)\n",
$pixelsX / 39.37, $pixelsY / 39.37);
}
}
break;
case 'PLTE':
$bit_idat = new IO_Bit();
$bit_idat->input($data);
$i = 0;
$unit = 8;
while ($bit_idat->hasNextData(3)) {
if (($i % $unit) === 0) {
printf(" 0x%02x:", $i);
}
$r = $bit_idat->getUI8();
$g = $bit_idat->getUI8();
$b = $bit_idat->getUI8();
printf(" %02x%02x%02x", $i, $r, $g, $b);
$i++;
if (($i > 0) && (($i % $unit) === 0)) {
echo "\n";
}
}
if (($i % $unit) !== 0) {
echo "\n";
}
break;
case 'tRNS':
switch ($colorType) {
case 0: // Gray
case 3: // PALETTE
$nComp = 1;
$unit = 24;
break;
case 2: // RGB
$nComp = 3;
$unit = 8;
break;
}
$bit_idat = new IO_Bit();
$bit_idat->input($data);
$i = 0;
while ($bit_idat->hasNextData($nComp)) {
if (($i % $unit) === 0) {
printf(" 0x%02x:", $i);
}
printf(" ");
for ($nc = 0; $nc < $nComp ; $nc++) {
printf("%02x", $bit_idat->getUI8());
}
$i++;
if (($i > 0) && (($i % $unit) === 0)) {
echo "\n";
}
}
if (($i % $unit) !== 0) {
echo "\n";
}
break;
case 'iCCP':
$bit_idat = new IO_Bit();
$bit_idat->input($data);
printf(" %s\n", $bit_idat->getData(5));
$compressedICCP =$bit_idat->getDataUntil(false);
$iccpData = gzuncompress($compressedICCP);
printf(" %s\n", substr($iccpData, 0, 0x20));
break;
case 'iDOT': // apple
$count = $data["count"];
$reserved = $data["reserved"];
$height = $data["height"];
$chunkSize = $data["chunkSize"];
$entries = $data["entries"];
echo " count:$count reserved:$reserved height:$height chunkSize:$chunkSize]\n";
if ($count !== count($entries) + 1) {
fprintf(STDERR, "Warning: count:$count !== count(entries):%d + 1\n", count($entries));
}
foreach ($entries as $i => $entry) {
$offset = $entry['offset'];
$height = $entry['height'];
$idatOffset = $entry['idatOffset'];
echo " [".($i+1)."/$count]: offset:$offset height:$height idatOffset:$idatOffset\n";
};
break;
case 'IDAT':
default:
$bit_data = new IO_Bit();
$bit_data->input($data);
$bit_data->hexdump(0, 0x10);
echo "...\n";
if ($chunk['Name'] === 'IDAT') {
$idat_data .= $data;
}
break;
case 'IEND':
// print IDAT inflated data
$idat_inflated = gzuncompress($idat_data);
$bit_iend = new IO_Bit();
$bit_iend->input($idat_inflated);
$bit_iend->hexdump(0, strlen($idat_inflated));
break;
}
if (empty($opts['hexdump']) === false) {
$bitio->hexdump($chunk['_offset'], $chunk['_length']);
}
}
}
function build($opts = array()) {
$bit = new IO_Bit();
$bit->putData(self::SIGNATURE);
foreach ($this->_chunkList as $chunk) {
$chunkName = $chunk['Name'];
$data = $chunk['Data'];
switch ($chunkName) {
case 'IHDR':
$bit_ihdr = new IO_Bit();
$bit_ihdr->putUI32BE($data['Width']);
$bit_ihdr->putUI32BE($data['Height']);
$bit_ihdr->putUI8($data['BitDepth']);
$bit_ihdr->putUI8($data['ColorType']);
$bit_ihdr->putUI8($data['Compression']);
$bit_ihdr->putUI8($data['Filter']);
$bit_ihdr->putUI8($data['Interlace']);
$data = $bit_ihdr->output();
break;
case 'gAMA':
$bit_gama = new IO_Bit();
$gamma = $data * 100000;
$bit_gama->putUI32BE($gamma);
$data = $bit_gama->output();
break;
case 'pHYs':
$bit_phys = new IO_Bit();
$bit_phys->putUI32BE($data['PixelsX']);
$bit_phys->putUI32BE($data['PixelsY']);
$bit_phys->putUI8($data['UnitSpec']);
$data = $bit_phys->output();
break;
case 'PLTE':
break;
case 'tRNS':
break;
case 'iDOT': // apple
$bit_idot = new IO_Bit();
$count = $data["count"];
$entries = $data["entries"];
if ($count !== count($entries) + 1) {
fprintf(STDERR, "Warning: count:$count !== count(entries):%d + 1\n", count($entries));
$count = count($entries) + 1;
}
$bit_idot->putUI32BE($count);
$bit_idot->putUI32BE($data["reserved"]);
$bit_idot->putUI32BE($data["height"]);
$bit_idot->putUI32BE($data["chunkSize"]);
$entries = $data["entries"];
if ($count !== count($entries)) {
fprintf(STDERR, "Warning: count:$count count(entries):%d\n", count($entries));
$count = count($entries);
}
foreach ($entry as $entries) {
$bit_idot->putUI32BE($entry["offset"]);
$bit_idot->putUI32BE($entry["height"]);
$bit_idot->putUI32BE($entry["idatOffset"]);
}
$data = $bit_idot->output();
break;
case 'IDAT':
break;
default:
break;
}
// build chunk
$dataSize = strlen($data);
$crc = crc32($chunkName . $data);
//
$bit->putUI32BE($dataSize);
$bit->putData($chunkName);
$bit->putData($data);
$bit->putUI32BE($crc);
}
return $bit->output();
}
function getIHDRdata() {
foreach ($this->_chunkList as $chunk) {
if ($chunk['Name'] === 'IHDR') {
return $chunk['Data'];
}
}
return false;
}
function getIDATdata() {
$idat_data = "";
foreach ($this->_chunkList as $chunk) {
if ($chunk['Name'] === 'IDAT') {
$idat_data .= $chunk['Data'];
}
}
return $idat_data;
}
function deleteChunks($name) {
foreach ($this->_chunkList as $idx => $chunk) {
if ($chunk['Name'] === $name) {
unset($this->_chunkList[$idx]);
}
}
}
static function getNCompByColorType($colortype) {
switch ($colortype) {
case 0: // GRAY
$ncomp = 1;
break;
case 2: // RGB (RGB24)
$ncomp = 3;
break;
case 3: // PALETTE
$ncomp = 1;
break;
case 4: // GRAY_ALPHA
$ncomp = 2;
break;
case 6: // RGB_ALPHA (RGB32)
$ncomp = 4;
break;
default:
throw new Exception("unknown colortype:$colortype");
}
return $ncomp;
}
function dumpFilter($opts = Array()) {
$summalize = $opts["summalize"];
$ihdr = $this->getIHDRdata();
if ($ihdr === false) {
fprintf(stderr, "Error: not found IDHR chunk\n");
return ;
}
$width = $ihdr['Width'];
$height = $ihdr['Height'];
$bitdepth = $ihdr['BitDepth'];
$colortype = $ihdr['ColorType'];
$idat_data = $this->getIDATdata();
if ($ihdr === false) {
fprintf(stderr, "Error: not found IDAT chunk or zero length\n");
return ;
}
$idat_inflated = gzuncompress($idat_data);
//
$ncomp = self::getNCompByColorType($colortype);
$stride = 1 + (int) ceil($width * $ncomp * $bitdepth / 8);
var_dump($stride);
$offset = 0;
$filterTable = [0 => 0, 1 => 0, 2 => 0, 3 => 0, 4 => 0];
for ($y = 0 ; $y < $height ; $y++) {
$filter = ord($idat_inflated[$offset]);
$offset += $stride;
if ($summalize) {
$filterTable[$filter]++;
} else {
echo "$filter ";
}
}
if ($summalize) {
ksort($filterTable);
foreach ($filterTable as $i => $f) {
echo "$i:$f".PHP_EOL;
}
} else {
echo PHP_EOL;
}
}
function changeFilter($filter) {
$ihdr = $this->getIHDRdata();
if ($ihdr === false) {
fprintf(stderr, "Error: not found IDHR chunk\n");
return ;
}
$width = $ihdr['Width'];
$height = $ihdr['Height'];
$bitdepth = $ihdr['BitDepth'];
$colortype = $ihdr['ColorType'];
$idat_data = $this->getIDATdata();
if ($ihdr === false) {
fprintf(stderr, "Error: not found IDAT chunk or zero length\n");
return ;
}
$idat_inflated = gzuncompress($idat_data);
//
$ncomp = self::getNCompByColorType($colortype);
$stride = 1 + (int) ceil($width * $ncomp * $bitdepth / 8);
$offset = 0;
for ($y = 0 ; $y < $height ; $y++) {
$idat_inflated[$offset] = chr($filter);
$offset += $stride;
}
$data = gzcompress($idat_inflated);
$dataSize = strlen($data);
$crc = crc32("IDAT" . $data);
$IDATchunk = array('Size' => $dataSize,
'Name' => "IDAT",
'Data' => $data,
'CRC' => $crc);
$this->deleteChunks("IDAT");
array_splice($this->_chunkList, -1, 0, [$IDATchunk]);
}
}