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Edit File : _compression.py \| Size : 5.55 KB
"""Internal classes used by the gzip, lzma and bz2 modules""" import io import sys BUFFER_SIZE = io.DEFAULT_BUFFER_SIZE # Compressed data read chunk size class BaseStream(io.BufferedIOBase): """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 not self.readable(): raise io.UnsupportedOperation("File not open for reading") def _check_can_write(self): if not self.writable(): raise io.UnsupportedOperation("File not open for writing") def _check_can_seek(self): if not self.readable(): raise io.UnsupportedOperation("Seeking is only supported " "on files open for reading") if not self.seekable(): raise io.UnsupportedOperation("The underlying file object " "does not support seeking") class DecompressReader(io.RawIOBase): """Adapts the decompressor API to a RawIOBase reader API""" def readable(self): return True def __init__(self, fp, decomp_factory, trailing_error=(), decomp_args): self._fp = fp self._eof = False self._pos = 0 # Current offset in decompressed stream # Set to size of decompressed stream once it is known, for SEEK_END self._size = -1 # Save the decompressor factory and arguments. # If the file contains multiple compressed streams, each # stream will need a separate decompressor object. A new decompressor # object is also needed when implementing a backwards seek(). self._decomp_factory = decomp_factory self._decomp_args = decomp_args self._decompressor = self._decomp_factory(self._decomp_args) # Exception class to catch from decompressor signifying invalid # trailing data to ignore self._trailing_error = trailing_error def close(self): self._decompressor = None return super().close() def seekable(self): return self._fp.seekable() def readinto(self, b): with memoryview(b) as view, view.cast("B") as byte_view: data = self.read(len(byte_view)) byte_view[:len(data)] = data return len(data) def read(self, size=-1): if size < 0: return self.readall() if not size or self._eof: return b"" data = None # Default if EOF is encountered # 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 True: if self._decompressor.eof: rawblock = (self._decompressor.unused_data or self._fp.read(BUFFER_SIZE)) if not rawblock: break # Continue to next stream. self._decompressor = self._decomp_factory( self._decomp_args) try: data = self._decompressor.decompress(rawblock, size) except self._trailing_error: # Trailing data isn't a valid compressed stream; ignore it. break else: if self._decompressor.needs_input: rawblock = self._fp.read(BUFFER_SIZE) if not rawblock: raise EOFError("Compressed file ended before the " "end-of-stream marker was reached") else: rawblock = b"" data = self._decompressor.decompress(rawblock, size) if data: break if not data: self._eof = True self._size = self._pos return b"" self._pos += len(data) return data def readall(self): chunks = [] # sys.maxsize means the max length of output buffer is unlimited, # so that the whole input buffer can be decompressed within one # .decompress() call. while data := self.read(sys.maxsize): chunks.append(data) return b"".join(chunks) # Rewind the file to the beginning of the data stream. def _rewind(self): self._fp.seek(0) self._eof = False self._pos = 0 self._decompressor = self._decomp_factory(self._decomp_args) def seek(self, offset, whence=io.SEEK_SET): # Recalculate offset as an absolute file position. if whence == io.SEEK_SET: pass elif whence == io.SEEK_CUR: offset = self._pos + offset elif whence == io.SEEK_END: # Seeking relative to EOF - we need to know the file's size. if self._size < 0: while self.read(io.DEFAULT_BUFFER_SIZE): pass 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. while offset > 0: data = self.read(min(io.DEFAULT_BUFFER_SIZE, offset)) if not data: break offset -= len(data) return self._pos def tell(self): """Return the current file position.""" return self._pos Back

Edit File : _compression.py | Size : 5.55 KB

"""Internal classes used by the gzip, lzma and bz2 modules"""

import io
import sys

BUFFER_SIZE = io.DEFAULT_BUFFER_SIZE  # Compressed data read chunk size

class BaseStream(io.BufferedIOBase):
    """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 not self.readable():
            raise io.UnsupportedOperation("File not open for reading")

def _check_can_write(self):
        if not self.writable():
            raise io.UnsupportedOperation("File not open for writing")

def _check_can_seek(self):
        if not self.readable():
            raise io.UnsupportedOperation("Seeking is only supported "
                                          "on files open for reading")
        if not self.seekable():
            raise io.UnsupportedOperation("The underlying file object "
                                          "does not support seeking")

class DecompressReader(io.RawIOBase):
    """Adapts the decompressor API to a RawIOBase reader API"""

def readable(self):
        return True

def __init__(self, fp, decomp_factory, trailing_error=(), **decomp_args):
        self._fp = fp
        self._eof = False
        self._pos = 0  # Current offset in decompressed stream

# Set to size of decompressed stream once it is known, for SEEK_END
        self._size = -1

# Save the decompressor factory and arguments.
        # If the file contains multiple compressed streams, each
        # stream will need a separate decompressor object. A new decompressor
        # object is also needed when implementing a backwards seek().
        self._decomp_factory = decomp_factory
        self._decomp_args = decomp_args
        self._decompressor = self._decomp_factory(**self._decomp_args)

# Exception class to catch from decompressor signifying invalid
        # trailing data to ignore
        self._trailing_error = trailing_error

def close(self):
        self._decompressor = None
        return super().close()

def seekable(self):
        return self._fp.seekable()

def readinto(self, b):
        with memoryview(b) as view, view.cast("B") as byte_view:
            data = self.read(len(byte_view))
            byte_view[:len(data)] = data
        return len(data)

def read(self, size=-1):
        if size < 0:
            return self.readall()

if not size or self._eof:
            return b""
        data = None  # Default if EOF is encountered
        # 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 True:
            if self._decompressor.eof:
                rawblock = (self._decompressor.unused_data or
                            self._fp.read(BUFFER_SIZE))
                if not rawblock:
                    break
                # Continue to next stream.
                self._decompressor = self._decomp_factory(
                    **self._decomp_args)
                try:
                    data = self._decompressor.decompress(rawblock, size)
                except self._trailing_error:
                    # Trailing data isn't a valid compressed stream; ignore it.
                    break
            else:
                if self._decompressor.needs_input:
                    rawblock = self._fp.read(BUFFER_SIZE)
                    if not rawblock:
                        raise EOFError("Compressed file ended before the "
                                       "end-of-stream marker was reached")
                else:
                    rawblock = b""
                data = self._decompressor.decompress(rawblock, size)
            if data:
                break
        if not data:
            self._eof = True
            self._size = self._pos
            return b""
        self._pos += len(data)
        return data

def readall(self):
        chunks = []
        # sys.maxsize means the max length of output buffer is unlimited,
        # so that the whole input buffer can be decompressed within one
        # .decompress() call.
        while data := self.read(sys.maxsize):
            chunks.append(data)

return b"".join(chunks)

# Rewind the file to the beginning of the data stream.
    def _rewind(self):
        self._fp.seek(0)
        self._eof = False
        self._pos = 0
        self._decompressor = self._decomp_factory(**self._decomp_args)

def seek(self, offset, whence=io.SEEK_SET):
        # Recalculate offset as an absolute file position.
        if whence == io.SEEK_SET:
            pass
        elif whence == io.SEEK_CUR:
            offset = self._pos + offset
        elif whence == io.SEEK_END:
            # Seeking relative to EOF - we need to know the file's size.
            if self._size < 0:
                while self.read(io.DEFAULT_BUFFER_SIZE):
                    pass
            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.
        while offset > 0:
            data = self.read(min(io.DEFAULT_BUFFER_SIZE, offset))
            if not data:
                break
            offset -= len(data)

return self._pos

def tell(self):
        """Return the current file position."""
        return self._pos

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