author | Tero Marttila <terom@fixme.fi> |
Sat, 20 Feb 2010 21:56:27 +0200 | |
changeset 61 | 1e26ee53381f |
parent 21 | aa6df8f9c44a |
permissions | -rw-r--r-- |
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try: |
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from cStringIO import StringIO |
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except ImportError: |
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from StringIO import StringIO |
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import struct |
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# prefixed to all struct format strings |
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STRUCT_PREFIX = '!' |
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def hex (bytes) : |
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return ' '.join(['%#04x' % ord(b) for b in bytes]) |
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class NotEnoughDataError (Exception) : |
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pass |
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class IStreamBase (object) : |
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# prefixed to all struct format strings |
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STRUCT_PREFIX = '!' |
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class IReadStream (IStreamBase) : |
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""" |
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IReadStream simply provides various interfaces for reading bytes from a |
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stream in various ways |
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""" |
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def read (self, size=None) : |
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""" |
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Read and return up to the given amount of bytes, or all bytes |
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available if no size given. |
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""" |
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abstract |
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def readStruct (self, fmt) : |
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""" |
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Reads the correct amount of data and then unpacks it according to |
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the given format. Note that this always returns a tuple, for single |
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items, use readItem |
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""" |
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fmt = self.STRUCT_PREFIX + fmt |
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fmt_size = struct.calcsize(fmt) |
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data = self.read(fmt_size) |
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return struct.unpack(fmt, data) |
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def readItem (self, fmt) : |
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""" |
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Reads the correct amount of data, unpacks it according to the |
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given format, and then returns the first item. |
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""" |
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return self.readStruct(fmt)[0] |
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def readVarLen (self, len_type) : |
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""" |
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Return the data part of a <length><data> structure. |
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len_type indicates what type length has (struct format code). |
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In the case of <length> being zero, returns an empty string. |
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""" |
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size = self.readItem(len_type) |
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if size : |
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return self.read(size) |
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else : |
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return "" |
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def readEnum (self, enum) : |
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""" |
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Returns the item from the given list of enum values that corresponds |
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to a single-byte value read from the stream |
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""" |
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return enum[self.readItem('B')] |
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class ISeekableStream (IStreamBase) : |
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""" |
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Extends IStreamBase to provide the ability to seek backwards into the |
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stream (which still does not know it's length, and thence cannot seek |
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forwards). |
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""" |
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_position = None |
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def tell (self) : |
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""" |
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Return the current offset into the seekable stream |
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""" |
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abstract |
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def seek (self, pos) : |
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""" |
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Seek to the given position in the stream. |
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""" |
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abstract |
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def mark (self) : |
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""" |
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Set a mark that can be later rolled back to with .reset() |
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""" |
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self._position = self.tell() |
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def unmark (self) : |
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""" |
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Remove the mark without affecting the current position |
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""" |
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self._position = None |
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def reset (self) : |
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""" |
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Rolls the buffer back to the position set earlier with mark() |
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""" |
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if self._position is not None : |
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self.seek(self._position) |
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self._position = None |
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else : |
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raise Exception("reset() without mark()") |
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class ISeekableReadStream (ISeekableStream, IReadStream) : |
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def peek (self, len=None) : |
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""" |
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Return a string representing what buf.read(len) would return, but do |
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not affect future read operations |
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""" |
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134 |
|
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pos = self.tell() |
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|
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data = self.read(len) |
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|
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self.seek(pos) |
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|
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return data |
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|
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143 |
|
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class INonBlockingReadStream (IReadStream) : |
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""" |
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Otherwise identical to IReadStream, but read will either return size |
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bytes, or raise a NotEnoughDataError |
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""" |
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149 |
|
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pass |
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|
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class IWriteStream (IStreamBase) : |
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""" |
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IWriteStream provides various ways to write data to a byte stream |
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""" |
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156 |
|
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def write (self, data) : |
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""" |
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Write the given bytes to the stream |
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""" |
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161 |
|
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162 |
abstract |
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|
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def writeStruct (self, fmt, *args) : |
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""" |
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Pack the given arguments with the given struct format, and write it |
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to the stream. |
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""" |
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|
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self.write(struct.pack(self.STRUCT_PREFIX + fmt, *args)) |
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|
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writeItem = writeStruct |
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|
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def writeVarLen (self, len_type, data) : |
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""" |
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Write a <length><data> field into the buffer. Len_type is the |
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struct format code for the length field. |
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""" |
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|
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self.writeStruct(len_type, len(data)) |
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self.write(data) |
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|
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def writeEnum (self, enum, name) : |
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""" |
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Write the single-byte value correspnding to the given name's |
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position in the given enum |
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""" |
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|
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self.writeStruct('B', enum.index(name)) |
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|
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class IBufferBase (ISeekableStream) : |
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""" |
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A buffer simply provides a way to read and write data to/from a byte |
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sequence stored in memory. |
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""" |
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196 |
|
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def tell (self) : |
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return self._buf.tell() |
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|
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def seek (self, offset) : |
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return self._buf.seek(offset) |
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202 |
|
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def getvalue (self) : |
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""" |
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Returns the value of the buffer, i.e. a string with the contents of |
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the buffer from position zero to the end. |
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""" |
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208 |
|
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return self._buf.getvalue() |
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|
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class ReadBuffer (INonBlockingReadStream, ISeekableReadStream, IBufferBase) : |
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""" |
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A read-only buffer. Can be initialized with a given value and then later |
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replaced in various ways, but cannot be modified. |
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""" |
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216 |
|
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def __init__ (self, data="") : |
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""" |
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Initialize the buffer with the given data |
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""" |
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221 |
|
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self._buf = StringIO(data) |
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|
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def read (self, size=None) : |
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""" |
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Return the given number of bytes, or raise a NotEnoughDataError |
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""" |
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228 |
|
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if size == 0 : |
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raise ValueError("can't read zero bytes") |
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231 |
|
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if size : |
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ret = self._buf.read(size) |
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else : |
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ret = self._buf.read() |
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236 |
|
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if size and len(ret) < size : |
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raise NotEnoughDataError() |
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239 |
|
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return ret |
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241 |
|
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def append (self, data) : |
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243 |
""" |
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Modify the buffer such that it contains the old data from this |
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buffer, and the given data at the end. The read position in the buffer |
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is kept the same. |
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""" |
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248 |
|
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pos = self.tell() |
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250 |
|
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self._buf = StringIO(self._buf.getvalue() + data) |
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252 |
|
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self.seek(pos) |
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254 |
|
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def chop (self) : |
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256 |
""" |
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257 |
Discard the data in the buffer before the current read position. |
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258 |
Also removes any marks. |
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""" |
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260 |
|
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self._position = None |
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262 |
|
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self._buf = StringIO(self.read()) |
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|
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def processWith (self, func) : |
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""" |
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Call the given function with this buffer as an argument after |
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calling mark(). If the function |
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a) returns None, the buffer is .chop()'d, and we repeat the |
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process. |
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b) raises a NotEnoughDataError, whereupon the buffer is rolled |
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back to where it was before calling the function with |
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chop(). |
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c) raises a StopIteration, whereupon we chop the buffer and |
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return. |
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d) returns something (i.e. ret is not None), whereupon we |
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return that (and leave the current buffer position untouched). |
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""" |
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ret = None |
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|
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try : |
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while ret is None : |
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self.mark() # mark the position of the packet we are processing |
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ret = func(self) |
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|
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if ret is None : |
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# discard the processed packet and proceed to the next one |
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self.chop() |
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289 |
|
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except NotEnoughDataError, e : |
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self.reset() # reset position back to the start of the packet |
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return e |
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293 |
|
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except StopIteration, e: |
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self.chop() |
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return e # processed ok, but we don't want to process any further packets |
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297 |
|
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else : |
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return ret |
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|
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class WriteBuffer (IWriteStream, IBufferBase) : |
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""" |
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A write-only buffer. Data can be written to this buffer in various |
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ways, but cannot be read from it except as a whole. |
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305 |
""" |
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306 |
|
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def __init__ (self) : |
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308 |
""" |
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Initialize the buffer |
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310 |
""" |
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311 |
|
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self._buf = StringIO() |
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313 |
|
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def write (self, data) : |
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315 |
""" |
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316 |
Write the given data to the current position in the stream, |
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317 |
overwriting any previous data in that position, and extending |
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318 |
the buffer if needed |
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319 |
""" |
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320 |
|
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return self._buf.write(data) |
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322 |
|
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323 |
def readStringStream (stream, varlen_type) : |
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324 |
""" |
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325 |
Does readVarLen on an IReadStream until it returns something that evaluates to false ( == zero-length string) |
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326 |
""" |
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327 |
|
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328 |
while True : |
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item = stream.readVarLen(varlen_type) |
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330 |
|
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331 |
if item : |
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332 |
yield item |
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333 |
else : |
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334 |
return |
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335 |
|
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336 |
def writeStringStream (stream, varlen_type, strings) : |
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337 |
""" |
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338 |
Writes strings from the given iterable into the given stream using the given varlen_type, ending with a null-length token |
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339 |
""" |
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340 |
|
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341 |
for item in strings : |
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342 |
stream.writeVarLen(varlen_type, item) |
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343 |
|
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344 |
stream.writeItem(varlen_type, 0) |
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345 |
|
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346 |
class StreamProtocol (object) : |
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347 |
""" |
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348 |
A mixin to let you use Buffer with twisted.internet.protocol.Protocol |
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349 |
""" |
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350 |
|
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351 |
# a list of receivable command names |
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|
352 |
RECV_COMMANDS = None |
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353 |
|
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354 |
# a list of sendable command names |
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355 |
SEND_COMMANDS = None |
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|
356 |
|
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357 |
def __init__ (self) : |
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358 |
""" |
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|
359 |
Initialize the cross-dataReceived buffer |
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|
360 |
""" |
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361 |
|
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362 |
self.in_buffer = ReadBuffer() |
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363 |
|
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364 |
def send (self, buf) : |
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365 |
""" |
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366 |
Write the contents of the given WriteBuffer to the transport |
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367 |
""" |
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368 |
|
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369 |
self.transport.write(buf.getvalue()) |
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370 |
|
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371 |
def dataReceived (self, data) : |
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372 |
""" |
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373 |
Buffer the incoming data and then try and process it |
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374 |
""" |
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375 |
|
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376 |
self.in_buffer.append(data) |
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377 |
|
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378 |
ret = self.in_buffer.processWith(self.processPacket) |
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379 |
|
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380 |
def processPacket (self, buf) : |
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381 |
""" |
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382 |
Call processCommand with the buffer, handling the return value (either None or a deferred) |
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383 |
""" |
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|
384 |
|
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385 |
ret = self.processCommand(buf) |
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|
386 |
|
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|
387 |
if ret : |
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|
388 |
ret.addCallback(self.send) |
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|
389 |
|
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|
390 |
def processCommand (self, buf) : |
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391 |
""" |
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392 |
Process a command from the given buffer. May return a callback |
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393 |
""" |
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394 |
|
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395 |
return self.readMethod(buf, self.RECV_COMMANDS, buf) |
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396 |
|
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397 |
# conveniance read/write |
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398 |
def startCommand (self, cmd) : |
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399 |
buf = WriteBuffer() |
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400 |
|
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401 |
buf.writeEnum(self.SEND_COMMANDS, cmd) |
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402 |
|
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403 |
return buf |
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404 |
|
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405 |
def readMethod (self, buf, methods, *args, **kwargs) : |
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406 |
""" |
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407 |
Reads a single-byte <methods>-enum value from the given buffer and |
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408 |
use it to find the corresponding method (as <prefix>_<method-name>, |
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prefix can be overriden with a keyword argument and defaults to |
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410 |
'on'. If any extra arguments are given, they will be passed to the |
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411 |
method. |
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""" |
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413 |
|
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414 |
prefix = kwargs.pop("prefix", "on") |
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415 |
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return getattr(self, "%s_%s" % (prefix, buf.readEnum(methods)))(*args, **kwargs) |
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417 |