gistfile1.py

class Reader(object):
    def __init__(self):
        self.buf = []
        self.result = []
        self._mode = 'keyvalue'
        self._resdict = {}
        self._datasize = 0
        self._databuf = []
        self._datakey = None

    def read(self, data):
        self.buf.append(data)
        if '\n' in data:
            data = ''.join(self.buf)
            lines = data.split('\n')
            lastline = lines.pop(-1)
            if lastline != '':
                self.buf = [lastline]
        self._parse(data)

    def _parse(self, lines):
        if self._mode == 'keyvalue':
            while lines:
                line = lines.pop(0)
                key, value = line.split(': ', 1)
                if key.endswith('Size'):
                    self._datasize = int(value)
                    self._mode = 'data'
                    self._datakey = key[:-len('Size')]
                    return self._parse(lines)
                else:
                    self._resdict[key] = value

        elif self._mode == 'data':
            while lines:
                line = lines.pop(0)
                self._databuf.append(line)
                if len(line) >= self._datasize:
                    data = '\n'.join(self._databuf)
                    self._resdict[self._datakey] = data
                    if self._datakey == 'Data':
                        self.result.append(self._resdict)
                        self._resdict = {}
                    self._mode = 'keyvalue'
                    return self._parse(lines)
                else:
                    self._datasize -= len(line) + 1