"""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
import os
from _lzma import *
from _lzma import _encode_filter_properties, _decode_filter_properties
import _compression


_MODE_CLOSED = 0
_MODE_READ = 1
# Value 2 no longer used
_MODE_WRITE = 3


class LZMAFile(_compression.BaseStream):

 """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,
 bytes, or PathLike 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

 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
 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)
 self._pos = 0
 else:
 raise ValueError("Invalid mode: {!r}".format(mode))

 if isinstance(filename, (str, bytes, os.PathLike)):
 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, bytes, file or PathLike object")

 if self._mode == _MODE_READ:
 raw = _compression.DecompressReader(self._fp, LZMADecompressor,
 trailing_error=LZMAError, format=format, filters=filters)
 self._buffer = io.BufferedReader(raw)

 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 == _MODE_READ:
 self._buffer.close()
 self._buffer = None
 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._buffer.seekable()

 def readable(self):
 """Return whether the file was opened for reading."""
 self._check_not_closed()
 return self._mode == _MODE_READ

 def writable(self):
 """Return whether the file was opened for writing."""
 self._check_not_closed()
 return self._mode == _MODE_WRITE

 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()
 # Relies on the undocumented fact that BufferedReader.peek() always
 # returns at least one byte (except at EOF)
 return self._buffer.peek(size)

 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()
 return self._buffer.read(size)

 def read1(self, size=-1):
 """Read up to size uncompressed bytes, while trying to avoid
 making multiple reads from the underlying stream. Reads up to a
 buffer's worth of data if size is negative.

 Returns b"" if the file is at EOF.
 """
 self._check_can_read()
 if size < 0:
 size = io.DEFAULT_BUFFER_SIZE
 return self._buffer.read1(size)

 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()
 return self._buffer.readline(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)

 def seek(self, offset, whence=io.SEEK_SET):
 """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, so depending on the parameters,
 this operation may be extremely slow.
 """
 self._check_can_seek()
 return self._buffer.seek(offset, whence)

 def tell(self):
 """Return the current file position."""
 self._check_not_closed()
 if self._mode == _MODE_READ:
 return self._buffer.tell()
 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, bytes,
 or PathLike 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, an 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)