EVOLUTION-MANAGER

Edit File: lzma.py

"""Interface to the liblzma compression library. This module provides a class for reading and writing compressed files, classes for incremental (de)compression, and convenience functions for one-shot (de)compression. These classes and functions support both the XZ and legacy LZMA container formats, as well as raw compressed data streams. """ __all__ = [ "CHECK_NONE", "CHECK_CRC32", "CHECK_CRC64", "CHECK_SHA256", "CHECK_ID_MAX", "CHECK_UNKNOWN", "FILTER_LZMA1", "FILTER_LZMA2", "FILTER_DELTA", "FILTER_X86", "FILTER_IA64", "FILTER_ARM", "FILTER_ARMTHUMB", "FILTER_POWERPC", "FILTER_SPARC", "FORMAT_AUTO", "FORMAT_XZ", "FORMAT_ALONE", "FORMAT_RAW", "MF_HC3", "MF_HC4", "MF_BT2", "MF_BT3", "MF_BT4", "MODE_FAST", "MODE_NORMAL", "PRESET_DEFAULT", "PRESET_EXTREME", "LZMACompressor", "LZMADecompressor", "LZMAFile", "LZMAError", "open", "compress", "decompress", "is_check_supported", ] import builtins import io from _lzma import * from _lzma import _encode_filter_properties, _decode_filter_properties _MODE_CLOSED = 0 _MODE_READ = 1 _MODE_READ_EOF = 2 _MODE_WRITE = 3 _BUFFER_SIZE = 8192 class LZMAFile(io.BufferedIOBase): """A file object providing transparent LZMA (de)compression. An LZMAFile can act as a wrapper for an existing file object, or refer directly to a named file on disk. Note that LZMAFile provides a *binary* file interface - data read is returned as bytes, and data to be written must be given as bytes. """ def __init__(self, filename=None, mode="r", *, format=None, check=-1, preset=None, filters=None): """Open an LZMA-compressed file in binary mode. filename can be either an actual file name (given as a str or bytes object), in which case the named file is opened, or it can be an existing file object to read from or write to. mode can be "r" for reading (default), "w" for (over)writing, "x" for creating exclusively, or "a" for appending. These can equivalently be given as "rb", "wb", "xb" and "ab" respectively. format specifies the container format to use for the file. If mode is "r", this defaults to FORMAT_AUTO. Otherwise, the default is FORMAT_XZ. check specifies the integrity check to use. This argument can only be used when opening a file for writing. For FORMAT_XZ, the default is CHECK_CRC64. FORMAT_ALONE and FORMAT_RAW do not support integrity checks - for these formats, check must be omitted, or be CHECK_NONE. When opening a file for reading, the *preset* argument is not meaningful, and should be omitted. The *filters* argument should also be omitted, except when format is FORMAT_RAW (in which case it is required). When opening a file for writing, the settings used by the compressor can be specified either as a preset compression level (with the *preset* argument), or in detail as a custom filter chain (with the *filters* argument). For FORMAT_XZ and FORMAT_ALONE, the default is to use the PRESET_DEFAULT preset level. For FORMAT_RAW, the caller must always specify a filter chain; the raw compressor does not support preset compression levels. preset (if provided) should be an integer in the range 0-9, optionally OR-ed with the constant PRESET_EXTREME. filters (if provided) should be a sequence of dicts. Each dict should have an entry for "id" indicating ID of the filter, plus additional entries for options to the filter. """ self._fp = None self._closefp = False self._mode = _MODE_CLOSED self._pos = 0 self._size = -1 if mode in ("r", "rb"): if check != -1: raise ValueError("Cannot specify an integrity check " "when opening a file for reading") if preset is not None: raise ValueError("Cannot specify a preset compression " "level when opening a file for reading") if format is None: format = FORMAT_AUTO mode_code = _MODE_READ # Save the args to pass to the LZMADecompressor initializer. # If the file contains multiple compressed streams, each # stream will need a separate decompressor object. self._init_args = {"format":format, "filters":filters} self._decompressor = LZMADecompressor(**self._init_args) self._buffer = b"" self._buffer_offset = 0 elif mode in ("w", "wb", "a", "ab", "x", "xb"): if format is None: format = FORMAT_XZ mode_code = _MODE_WRITE self._compressor = LZMACompressor(format=format, check=check, preset=preset, filters=filters) else: raise ValueError("Invalid mode: {!r}".format(mode)) if isinstance(filename, (str, bytes)): if "b" not in mode: mode += "b" self._fp = builtins.open(filename, mode) self._closefp = True self._mode = mode_code elif hasattr(filename, "read") or hasattr(filename, "write"): self._fp = filename self._mode = mode_code else: raise TypeError("filename must be a str or bytes object, or a file") def close(self): """Flush and close the file. May be called more than once without error. Once the file is closed, any other operation on it will raise a ValueError. """ if self._mode == _MODE_CLOSED: return try: if self._mode in (_MODE_READ, _MODE_READ_EOF): self._decompressor = None self._buffer = b"" elif self._mode == _MODE_WRITE: self._fp.write(self._compressor.flush()) self._compressor = None finally: try: if self._closefp: self._fp.close() finally: self._fp = None self._closefp = False self._mode = _MODE_CLOSED @property def closed(self): """True if this file is closed.""" return self._mode == _MODE_CLOSED def fileno(self): """Return the file descriptor for the underlying file.""" self._check_not_closed() return self._fp.fileno() def seekable(self): """Return whether the file supports seeking.""" return self.readable() and self._fp.seekable() def readable(self): """Return whether the file was opened for reading.""" self._check_not_closed() return self._mode in (_MODE_READ, _MODE_READ_EOF) def writable(self): """Return whether the file was opened for writing.""" self._check_not_closed() return self._mode == _MODE_WRITE # Mode-checking helper functions. def _check_not_closed(self): if self.closed: raise ValueError("I/O operation on closed file") def _check_can_read(self): if self._mode not in (_MODE_READ, _MODE_READ_EOF): self._check_not_closed() raise io.UnsupportedOperation("File not open for reading") def _check_can_write(self): if self._mode != _MODE_WRITE: self._check_not_closed() raise io.UnsupportedOperation("File not open for writing") def _check_can_seek(self): if self._mode not in (_MODE_READ, _MODE_READ_EOF): self._check_not_closed() raise io.UnsupportedOperation("Seeking is only supported " "on files open for reading") if not self._fp.seekable(): raise io.UnsupportedOperation("The underlying file object " "does not support seeking") # Fill the readahead buffer if it is empty. Returns False on EOF. def _fill_buffer(self): if self._mode == _MODE_READ_EOF: return False # Depending on the input data, our call to the decompressor may not # return any data. In this case, try again after reading another block. while self._buffer_offset == len(self._buffer): rawblock = (self._decompressor.unused_data or self._fp.read(_BUFFER_SIZE)) if not rawblock: if self._decompressor.eof: self._mode = _MODE_READ_EOF self._size = self._pos return False else: raise EOFError("Compressed file ended before the " "end-of-stream marker was reached") if self._decompressor.eof: # Continue to next stream. self._decompressor = LZMADecompressor(**self._init_args) try: self._buffer = self._decompressor.decompress(rawblock) except LZMAError: # Trailing data isn't a valid compressed stream; ignore it. self._mode = _MODE_READ_EOF self._size = self._pos return False else: self._buffer = self._decompressor.decompress(rawblock) self._buffer_offset = 0 return True # Read data until EOF. # If return_data is false, consume the data without returning it. def _read_all(self, return_data=True): # The loop assumes that _buffer_offset is 0. Ensure that this is true. self._buffer = self._buffer[self._buffer_offset:] self._buffer_offset = 0 blocks = [] while self._fill_buffer(): if return_data: blocks.append(self._buffer) self._pos += len(self._buffer) self._buffer = b"" if return_data: return b"".join(blocks) # Read a block of up to n bytes. # If return_data is false, consume the data without returning it. def _read_block(self, n, return_data=True): # If we have enough data buffered, return immediately. end = self._buffer_offset + n if end <= len(self._buffer): data = self._buffer[self._buffer_offset : end] self._buffer_offset = end self._pos += len(data) return data if return_data else None # The loop assumes that _buffer_offset is 0. Ensure that this is true. self._buffer = self._buffer[self._buffer_offset:] self._buffer_offset = 0 blocks = [] while n > 0 and self._fill_buffer(): if n < len(self._buffer): data = self._buffer[:n] self._buffer_offset = n else: data = self._buffer self._buffer = b"" if return_data: blocks.append(data) self._pos += len(data) n -= len(data) if return_data: return b"".join(blocks) def peek(self, size=-1): """Return buffered data without advancing the file position. Always returns at least one byte of data, unless at EOF. The exact number of bytes returned is unspecified. """ self._check_can_read() if not self._fill_buffer(): return b"" return self._buffer[self._buffer_offset:] def read(self, size=-1): """Read up to size uncompressed bytes from the file. If size is negative or omitted, read until EOF is reached. Returns b"" if the file is already at EOF. """ self._check_can_read() if size == 0: return b"" elif size < 0: return self._read_all() else: return self._read_block(size) def read1(self, size=-1): """Read up to size uncompressed bytes, while trying to avoid making multiple reads from the underlying stream. Returns b"" if the file is at EOF. """ # Usually, read1() calls _fp.read() at most once. However, sometimes # this does not give enough data for the decompressor to make progress. # In this case we make multiple reads, to avoid returning b"". self._check_can_read() if (size == 0 or # Only call _fill_buffer() if the buffer is actually empty. # This gives a significant speedup if *size* is small. (self._buffer_offset == len(self._buffer) and not self._fill_buffer())): return b"" if size > 0: data = self._buffer[self._buffer_offset : self._buffer_offset + size] self._buffer_offset += len(data) else: data = self._buffer[self._buffer_offset:] self._buffer = b"" self._buffer_offset = 0 self._pos += len(data) return data def readline(self, size=-1): """Read a line of uncompressed bytes from the file. The terminating newline (if present) is retained. If size is non-negative, no more than size bytes will be read (in which case the line may be incomplete). Returns b'' if already at EOF. """ self._check_can_read() # Shortcut for the common case - the whole line is in the buffer. if size < 0: end = self._buffer.find(b"\n", self._buffer_offset) + 1 if end > 0: line = self._buffer[self._buffer_offset : end] self._buffer_offset = end self._pos += len(line) return line return io.BufferedIOBase.readline(self, size) def write(self, data): """Write a bytes object to the file. Returns the number of uncompressed bytes written, which is always len(data). Note that due to buffering, the file on disk may not reflect the data written until close() is called. """ self._check_can_write() compressed = self._compressor.compress(data) self._fp.write(compressed) self._pos += len(data) return len(data) # Rewind the file to the beginning of the data stream. def _rewind(self): self._fp.seek(0, 0) self._mode = _MODE_READ self._pos = 0 self._decompressor = LZMADecompressor(**self._init_args) self._buffer = b"" self._buffer_offset = 0 def seek(self, offset, whence=0): """Change the file position. The new position is specified by offset, relative to the position indicated by whence. Possible values for whence are: 0: start of stream (default): offset must not be negative 1: current stream position 2: end of stream; offset must not be positive Returns the new file position. Note that seeking is emulated, sp depending on the parameters, this operation may be extremely slow. """ self._check_can_seek() # Recalculate offset as an absolute file position. if whence == 0: pass elif whence == 1: offset = self._pos + offset elif whence == 2: # Seeking relative to EOF - we need to know the file's size. if self._size < 0: self._read_all(return_data=False) offset = self._size + offset else: raise ValueError("Invalid value for whence: {}".format(whence)) # Make it so that offset is the number of bytes to skip forward. if offset < self._pos: self._rewind() else: offset -= self._pos # Read and discard data until we reach the desired position. self._read_block(offset, return_data=False) return self._pos def tell(self): """Return the current file position.""" self._check_not_closed() return self._pos def open(filename, mode="rb", *, format=None, check=-1, preset=None, filters=None, encoding=None, errors=None, newline=None): """Open an LZMA-compressed file in binary or text mode. filename can be either an actual file name (given as a str or bytes object), in which case the named file is opened, or it can be an existing file object to read from or write to. The mode argument can be "r", "rb" (default), "w", "wb", "x", "xb", "a", or "ab" for binary mode, or "rt", "wt", "xt", or "at" for text mode. The format, check, preset and filters arguments specify the compression settings, as for LZMACompressor, LZMADecompressor and LZMAFile. For binary mode, this function is equivalent to the LZMAFile constructor: LZMAFile(filename, mode, ...). In this case, the encoding, errors and newline arguments must not be provided. For text mode, a LZMAFile object is created, and wrapped in an io.TextIOWrapper instance with the specified encoding, error handling behavior, and line ending(s). """ if "t" in mode: if "b" in mode: raise ValueError("Invalid mode: %r" % (mode,)) else: if encoding is not None: raise ValueError("Argument 'encoding' not supported in binary mode") if errors is not None: raise ValueError("Argument 'errors' not supported in binary mode") if newline is not None: raise ValueError("Argument 'newline' not supported in binary mode") lz_mode = mode.replace("t", "") binary_file = LZMAFile(filename, lz_mode, format=format, check=check, preset=preset, filters=filters) if "t" in mode: return io.TextIOWrapper(binary_file, encoding, errors, newline) else: return binary_file def compress(data, format=FORMAT_XZ, check=-1, preset=None, filters=None): """Compress a block of data. Refer to LZMACompressor's docstring for a description of the optional arguments *format*, *check*, *preset* and *filters*. For incremental compression, use an LZMACompressor instead. """ comp = LZMACompressor(format, check, preset, filters) return comp.compress(data) + comp.flush() def decompress(data, format=FORMAT_AUTO, memlimit=None, filters=None): """Decompress a block of data. Refer to LZMADecompressor's docstring for a description of the optional arguments *format*, *check* and *filters*. For incremental decompression, use an LZMADecompressor instead. """ results = [] while True: decomp = LZMADecompressor(format, memlimit, filters) try: res = decomp.decompress(data) except LZMAError: if results: break # Leftover data is not a valid LZMA/XZ stream; ignore it. else: raise # Error on the first iteration; bail out. results.append(res) if not decomp.eof: raise LZMAError("Compressed data ended before the " "end-of-stream marker was reached") data = decomp.unused_data if not data: break return b"".join(results)