3 replies to this topic

[brock123]

I'm writing a program (in Python for now) for reading PSD files. I'm using this specification: Adobe Photoshop: Summary from the Encyclopedia of Graphics File Formats Here it says

BYTE Name[]; /* Even-length Pascal-format string, 2 bytes or longer */

Um, 2 bytes or longer? How am I supposed to find out how ling it is? I don't know what "Pascal-format string" means either. Thanks in advance.

EDIT: Heres a direct link to the official PSD specification (pdf): http://forums.adobe....3C10A1EBF.node0 Look in page 9, under "Image Resource Blocks"

[brock123]

Of course reading one byte at a time and checking if it's an ASCII character won't work.

python code

# Name: Pascal string, padded to make the size even (a null name consists of two bytes of 0)

name = []

while True:

	char = file.read(1)

	try:

		char.decode('ascii')

		name.append(char)

	except UnicodeDecodeError:

		break

		

print 'name:', str(name)

Please help. Im out of ideas.

[WingedPanther]

From Essential Pascal on marcocantu.com

"In Borland's Turbo Pascal and in 16-bit Delphi, the typical string type is a sequence of characters with a length byte at the beginning, indicating the current size of the string. "

[brock123]

Thank you :)