git to make a super small pdf

small.py

EOL = "\x0d\x0a"

class PDFMaker:
    def __init__(self, filename):
        self.outf = open(filename,"wb")
        self.pos = 0
        self.trans = []
        self.objs = []
    def incpos(self, size):
        self.pos = self.pos + size
        return self.pos
    def getpos(self):
        return self.pos
    def write(self,msg):
        before_pos = self.getpos()
        self.outf.write(msg)
        self.incpos(len(msg))
        after_pos = self.getpos()
        self.trans.append(("w", before_pos, after_pos, msg))
    def writeln(self, msg):
        self.write(msg)
        self.write(EOL)
    def make(self):
        self.writeln("%PDF-1.7")
        self.writecatalog()
        self.writepages()
        self.writexref()
        self.writetrailer()
    def close(self):
        if self.outf:
            self.outf.close()
            self.outf = None
    def dumptrans(self):
        for t in self.trans:
            print t
    def writeobj(self, onum, streamdata):
        self.objs.append((onum, self.getpos()))
        self.writeln("%d 0 obj << %s >> endobj" % (onum, streamdata))
    def writecatalog(self):
        self.catalog_pos = self.getpos()
        self.writeobj(1, "/Type /Catalog /Pages 2 0 R")
    def writepages(self):
        self.pages_pos = self.getpos()
        self.writeobj(2, "/Type /Pages /Kids [3 0 R]")
        # write single page
        self.page_3_pos = self.getpos()
        self.writeobj(3,"/Type /Page")
    def writexref(self):
        self.xref_pos = self.getpos()
        self.writeln("xref")
        # look at the index of the lowest object in the list
        # len of the xref is the len of the objs
        self.writeln("%d %d" % (self.objs[0][0], len(self.objs))) # start a 1 3 entries
        for (oidx,opos) in self.objs:
            ts = "%010d %05d n" % (opos,0)
            self.writeln(ts)
    def writetrailer(self):
        self.trailer_pos = self.getpos()
        self.writeln("trailer")
        self.writeln("<</Size 2 /Root 1 0 R>>")
        self.writeln("startxref")
        self.writeln("%d" % (self.xref_pos,))
        self.write("%%EOF")



PATH="out.pdf"
pdf = None
try:
    pdf = PDFMaker(PATH)
    pdf.make()
finally:
    if pdf is not None:
        pdf.close()

pdf.dumptrans()
print pdf.objs