No tranquilo no me ofendes..
¿por que lo he puesto en un foro de PHP? por que el que no encuentre algo en internet no significa que no se pueda hacer, posiblemente haya alguien que sepa como averiguar esa informacion que a mi me falta para poder leer los pinceles y que no este en internet...
Por ejemplo hace unas semanas queria hacer un programa que me mostrara un PSD con visual basic, y no tenia ni p*** idea...
pues gracias a que encontre esta clase en internet de php pude averiguar como hacerlo en visual basic...
con esto quiero decir que aveces no hace falta que te indiquen el final del camino con que te indiquen el pricipio es de gran ayuda...
PD: aprovecho y dejo la clase de php por aqui...
Código PHP:
class PhpPsdReader {
var $infoArray;
var $fp;
var $fileName;
var $tempFileName;
var $colorBytesLength;
function PhpPsdReader($fileName) {
set_time_limit(0);
$this->infoArray = array();
$this->fileName = $fileName;
$this->fp = fopen($this->fileName,'r');
if (fread($this->fp,4)=='8BPS') {
$this->infoArray['version id'] = $this->_getInteger(2);
fseek($this->fp,6,SEEK_CUR); // 6 bytes of 0's
$this->infoArray['channels'] = $this->_getInteger(2);
$this->infoArray['rows'] = $this->_getInteger(4);
$this->infoArray['columns'] = $this->_getInteger(4);
$this->infoArray['colorDepth'] = $this->_getInteger(2);
$this->infoArray['colorMode'] = $this->_getInteger(2);
/* COLOR MODE DATA SECTION */ //4bytes Length The length of the following color data.
$this->infoArray['colorModeDataSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['colorModeDataSectionLength'],SEEK_CUR); // ignore this snizzle
/* IMAGE RESOURCES */
$this->infoArray['imageResourcesSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['imageResourcesSectionLength'],SEEK_CUR); // ignore this snizzle
/* LAYER AND MASK */
$this->infoArray['layerMaskDataSectionLength'] = $this->_getInteger(4);
fseek($this->fp,$this->infoArray['layerMaskDataSectionLength'],SEEK_CUR); // ignore this snizzle
/* IMAGE DATA */
$this->infoArray['compressionType'] = $this->_getInteger(2);
$this->infoArray['oneColorChannelPixelBytes'] = $this->infoArray['colorDepth']/8;
$this->colorBytesLength = $this->infoArray['rows']*$this->infoArray['columns']*$this->infoArray['oneColorChannelPixelBytes'];
if ($this->infoArray['colorMode']==2) {
$this->infoArray['error'] = 'images with indexed colours are not supported yet';
return false;
}
} else {
$this->infoArray['error'] = 'invalid or unsupported psd';
return false;
}
}
function getImage() {
// decompress image data if required
switch($this->infoArray['compressionType']) {
// case 2:, case 3: zip not supported yet..
case 1:
// packed bits
$this->infoArray['scanLinesByteCounts'] = array();
for ($i=0; $i<($this->infoArray['rows']*$this->infoArray['channels']); $i++) $this->infoArray['scanLinesByteCounts'][] = $this->_getInteger(2);
$this->tempFileName = tempnam(realpath('/tmp'),'decompressedImageData');
$tfp = fopen($this->tempFileName,'wb');
foreach ($this->infoArray['scanLinesByteCounts'] as $scanLinesByteCount) {
fwrite($tfp,$this->_getPackedBitsDecoded(fread($this->fp,$scanLinesByteCount)));
}
fclose($tfp);
fclose($this->fp);
$this->fp = fopen($this->tempFileName,'r');
default:
// continue with current file handle;
break;
}
// let's write pixel by pixel....
$image = imagecreatetruecolor($this->infoArray['columns'],$this->infoArray['rows']);
for ($rowPointer = 0; ($rowPointer < $this->infoArray['rows']); $rowPointer++) {
for ($columnPointer = 0; ($columnPointer < $this->infoArray['columns']); $columnPointer++) {
/* The color mode of the file. Supported values are: Bitmap=0;
Grayscale=1; Indexed=2; RGB=3; CMYK=4; Multichannel=7;
Duotone=8; Lab=9.
*/
switch ($this->infoArray['colorMode']) {
case 2: // indexed... info should be able to extract from color mode data section. not implemented yet, so is grayscale
exit;
break;
case 0:
// bit by bit
if ($columnPointer == 0) $bitPointer = 0;
if ($bitPointer==0) $currentByteBits = str_pad(base_convert(bin2hex(fread($this->fp,1)), 16, 2),8,'0',STR_PAD_LEFT);
$r = $g = $b = (($currentByteBits[$bitPointer]=='1')?0:255);
$bitPointer++;
if ($bitPointer==8) $bitPointer = 0;
break;
case 1:
case 8: // 8 is indexed with 1 color..., so grayscale
$r = $g = $b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
break;
case 4: // CMYK
$c = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$m = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$y = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$k = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
$r = round(($c * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
$g = round(($m * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
$b = round(($y * $k) / (pow(2,$this->infoArray['colorDepth'])-1));
break;
case 9: // hunter Lab
// i still need an understandable lab2rgb convert algorithm... if you have one, please let me know!
$l = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$a = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
$r = $l;
$g = $a;
$b = $b;
break;
default:
$r = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
$currentPointerPos = ftell($this->fp);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$g = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$this->colorBytesLength-1,SEEK_CUR);
$b = $this->_getInteger($this->infoArray['oneColorChannelPixelBytes']);
fseek($this->fp,$currentPointerPos);
break;
}
if (($this->infoArray['oneColorChannelPixelBytes']==2)) {
$r = $r >> 8;
$g = $g >> 8;
$b = $b >> 8;
} elseif (($this->infoArray['oneColorChannelPixelBytes']==4)) {
$r = $r >> 24;
$g = $g >> 24;
$b = $b >> 24;
}
$pixelColor = imagecolorallocate($image,$r,$g,$b);
imagesetpixel($image,$columnPointer,$rowPointer,$pixelColor);
}
}
fclose($this->fp);
if (isset($this->tempFileName)) unlink($this->tempFileName);
return $image;
}
/**
*
* PRIVATE FUNCTIONS
*
*/
function _getPackedBitsDecoded($string) {
/*
The PackBits algorithm will precede a block of data with a one byte header n, where n is interpreted as follows:
n Meaning
0 to 127 Copy the next n + 1 symbols verbatim
-127 to -1 Repeat the next symbol 1 - n times
-128 Do nothing
Decoding:
Step 1. Read the block header (n).
Step 2. If the header is an EOF exit.
Step 3. If n is non-negative, copy the next n + 1 symbols to the output stream and go to step 1.
Step 4. If n is negative, write 1 - n copies of the next symbol to the output stream and go to step 1.
*/
$stringPointer = 0;
$returnString = '';
while (1) {
if (isset($string[$stringPointer])) $headerByteValue = $this->_unsignedToSigned(hexdec(bin2hex($string[$stringPointer])),1);
else return $returnString;
$stringPointer++;
if ($headerByteValue >= 0) {
for ($i=0; $i <= $headerByteValue; $i++) {
$returnString .= $string[$stringPointer];
$stringPointer++;
}
} else {
if ($headerByteValue != -128) {
$copyByte = $string[$stringPointer];
$stringPointer++;
for ($i=0; $i < (1-$headerByteValue); $i++) {
$returnString .= $copyByte;
}
}
}
}
}
function _unsignedToSigned($int,$byteSize=1) {
switch($byteSize) {
case 1:
if ($int<128) return $int;
else return -256+$int;
break;
case 2:
if ($int<32768) return $int;
else return -65536+$int;
case 4:
if ($int<2147483648) return $int;
else return -4294967296+$int;
default:
return $int;
}
}
function _hexReverse($hex) {
$output = '';
if (strlen($hex)%2) return false;
for ($pointer = strlen($hex);$pointer>=0;$pointer-=2) $output .= substr($hex,$pointer,2);
return $output;
}
function _getInteger($byteCount=1) {
switch ($byteCount) {
case 4:
// for some strange reason this is still broken...
return @reset(unpack('N',fread($this->fp,4)));
break;
case 2:
return @reset(unpack('n',fread($this->fp,2)));
break;
default:
return hexdec($this->_hexReverse(bin2hex(fread($this->fp,$byteCount))));
}
}
}
/**
* Returns an image identifier representing the image obtained from the given filename, using only GD, returns an empty string on failure
*
* @param string $fileName
* @return image identifier
*/
function imagecreatefrompsd($fileName) {
$psdReader = new PhpPsdReader($fileName);
if (isset($psdReader->infoArray['error'])) return '';
else return $psdReader->getImage();
}