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from threading import Lock
from typing import Union
from ._cffi_ppmd import ffi, lib
__all__ = (
"Ppmd7Encoder",
"Ppmd7Decoder",
"Ppmd8Encoder",
"Ppmd8Decoder",
"PpmdError",
"PPMD8_RESTORE_METHOD_RESTART",
"PPMD8_RESTORE_METHOD_CUT_OFF",
)
PPMD8_RESTORE_METHOD_RESTART = 0
PPMD8_RESTORE_METHOD_CUT_OFF = 1
# PPMD8_RESTORE_METHOD_FREEZE = 2
_PPMD7_MIN_ORDER = 2
_PPMD7_MAX_ORDER = 64
_PPMD7_MIN_MEM_SIZE = 1 << 11
_PPMD7_MAX_MEM_SIZE = 0xFFFFFFFF - 12 * 3
_BLOCK_SIZE = 16384
_allocated = []
CFFI_PYPPMD = True
_new_nonzero = ffi.new_allocator(should_clear_after_alloc=False)
class PpmdError(Exception):
"Call to the underlying PPMd library failed."
pass
@ffi.def_extern()
def raw_alloc(size: int) -> object:
if size == 0:
return ffi.NULL
block = ffi.new("char[]", size)
_allocated.append(block)
return block
@ffi.def_extern()
def raw_free(o: object) -> None:
if o in _allocated:
_allocated.remove(o)
class _BlocksOutputBuffer:
KB = 1024
MB = 1024 * 1024
BUFFER_BLOCK_SIZE = (
32 * KB,
64 * KB,
256 * KB,
1 * MB,
4 * MB,
8 * MB,
16 * MB,
16 * MB,
32 * MB,
32 * MB,
32 * MB,
32 * MB,
64 * MB,
64 * MB,
128 * MB,
128 * MB,
256 * MB,
)
MEM_ERR_MSG = "Unable to allocate output buffer."
def initAndGrow(self, out, max_length):
# Set & check max_length
self.max_length = max_length
if 0 <= max_length < self.BUFFER_BLOCK_SIZE[0]:
block_size = max_length
else:
block_size = self.BUFFER_BLOCK_SIZE[0]
# The first block
block = _new_nonzero("char[]", block_size)
if block == ffi.NULL:
raise MemoryError
# Create the list
self.list = [block]
# Set variables
self.allocated = block_size
out.dst = block
out.size = block_size
out.pos = 0
# def initWithSize(self, out, init_size):
# # The first block
# block = _new_nonzero("char[]", init_size)
# if block == ffi.NULL:
# raise MemoryError(self.MEM_ERR_MSG)
#
# # Create the list
# self.list = [block]
#
# # Set variables
# self.allocated = init_size
# self.max_length = -1
# out.dst = block
# out.size = init_size
# out.pos = 0
def grow(self, out):
# Ensure no gaps in the data
assert out.pos == out.size
# Get block size
list_len = len(self.list)
if list_len < len(self.BUFFER_BLOCK_SIZE):
block_size = self.BUFFER_BLOCK_SIZE[list_len]
else:
block_size = self.BUFFER_BLOCK_SIZE[-1]
# Check max_length
if self.max_length >= 0:
# If (rest == 0), should not grow the buffer.
rest = self.max_length - self.allocated
assert rest > 0
# block_size of the last block
if block_size > rest:
block_size = rest
# Create the block
b = _new_nonzero("char[]", block_size)
if b == ffi.NULL:
raise MemoryError(self.MEM_ERR_MSG)
self.list.append(b)
# Set variables
self.allocated += block_size
out.dst = b
out.size = block_size
out.pos = 0
def reachedMaxLength(self, out):
# Ensure (data size == allocated size)
assert out.pos == out.size
return self.allocated == self.max_length
def finish(self, out):
# Fast path for single block
if (len(self.list) == 1 and out.pos == out.size) or (len(self.list) == 2 and out.pos == 0):
return bytes(ffi.buffer(self.list[0]))
# Final bytes object
data_size = self.allocated - (out.size - out.pos)
final = _new_nonzero("char[]", data_size)
if final == ffi.NULL:
raise MemoryError(self.MEM_ERR_MSG)
# Memory copy
# Blocks except the last one
posi = 0
for block in self.list[:-1]:
ffi.memmove(final + posi, block, len(block))
posi += len(block)
# The last block
ffi.memmove(final + posi, self.list[-1], out.pos)
return bytes(ffi.buffer(final))
class PpmdBaseEncoder:
def __init__(self):
pass
def _init_common(self):
self.lock = Lock()
self.closed = False
self.flushed = False
self.writer = ffi.new("BufferWriter *")
self._allocator = ffi.new("IAlloc *")
self._allocator.Alloc = lib.raw_alloc
self._allocator.Free = lib.raw_free
def _setup_inBuffer(self, data):
# Input buffer
in_buf = _new_nonzero("InBuffer *")
if in_buf == ffi.NULL:
raise MemoryError
in_buf.src = ffi.from_buffer(data)
in_buf.size = len(data)
in_buf.pos = 0
return in_buf
def _setup_outBuffer(self):
# Output buffer
out_buf = _new_nonzero("OutBuffer *")
self.writer.outBuffer = out_buf
if out_buf == ffi.NULL:
raise MemoryError
out = _BlocksOutputBuffer()
# Initialize output buffer
out.initAndGrow(out_buf, -1)
return (out, out_buf)
def encode(self, data) -> bytes:
return b""
def flush(self) -> bytes:
return b""
def _release(self):
ffi.release(self._allocator)
ffi.release(self.writer)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if not self.flushed:
self.flush()
class PpmdBaseDecoder:
def __init__(self):
pass
def _init_common(self):
self.lock = Lock()
self._allocator = ffi.new("IAlloc *")
self._allocator.Alloc = lib.raw_alloc
self._allocator.Free = lib.raw_free
self.reader = ffi.new("BufferReader *")
self._in_buf = _new_nonzero("InBuffer *")
self.reader.inBuffer = self._in_buf
self._input_buffer = ffi.NULL
self._input_buffer_size = 0
self._in_begin = 0
self._in_end = 0
self.closed = False
self.inited = False
def _release(self):
ffi.release(self._in_buf)
ffi.release(self.reader)
ffi.release(self._allocator)
def _setup_inBuffer(self, data):
# Input buffer
in_buf = self.reader.inBuffer
# Prepare input buffer w/wo unconsumed data
if self._in_begin == self._in_end:
# No unconsumed data
use_input_buffer = False
in_buf.src = ffi.from_buffer(data)
in_buf.size = len(data)
in_buf.pos = 0
elif len(data) == 0:
# Has unconsumed data, fast path for b"".
assert self._in_begin < self._in_end
use_input_buffer = True
in_buf.src = self._input_buffer + self._in_begin
in_buf.size = self._in_end - self._in_begin
in_buf.pos = 0
else:
# Has unconsumed data
use_input_buffer = True
# Unconsumed data size in input_buffer
used_now = self._in_end - self._in_begin
# Number of bytes we can append to input buffer
avail_now = self._input_buffer_size - self._in_end
# Number of bytes we can append if we move existing
# contents to beginning of buffer
avail_total = self._input_buffer_size - used_now
assert used_now > 0 and avail_now >= 0 and avail_total >= 0
if avail_total < len(data):
new_size = used_now + len(data)
# Allocate with new size
tmp = _new_nonzero("char[]", new_size)
if tmp == ffi.NULL:
raise MemoryError
# Copy unconsumed data to the beginning of new buffer
ffi.memmove(tmp, self._input_buffer + self._in_begin, used_now)
# Switch to new buffer
self._input_buffer = tmp
self._input_buffer_size = new_size
# Set begin & end position
self._in_begin = 0
self._in_end = used_now
elif avail_now < len(data):
# Move unconsumed data to the beginning
ffi.memmove(self._input_buffer, self._input_buffer + self._in_begin, used_now)
# Set begin & end position
self._in_begin = 0
self._in_end = used_now
# Copy data to input buffer
ffi.memmove(self._input_buffer + self._in_end, ffi.from_buffer(data), len(data))
self._in_end += len(data)
in_buf.src = self._input_buffer + self._in_begin
in_buf.size = used_now + len(data)
in_buf.pos = 0
# Now in_buf.pos == 0
return in_buf, use_input_buffer
def _setup_outBuffer(self):
# Output buffer
out_buf = _new_nonzero("OutBuffer *")
if out_buf == ffi.NULL:
raise MemoryError
out = _BlocksOutputBuffer()
# Initialize output buffer
out.initAndGrow(out_buf, -1)
return out, out_buf
def _unconsumed_in(self, in_buf, use_input_buffer):
# Unconsumed input data
if in_buf.pos == in_buf.size:
if use_input_buffer:
# Clear input_buffer
self._in_begin = 0
self._in_end = 0
elif in_buf.pos < in_buf.size:
data_size = in_buf.size - in_buf.pos
if not use_input_buffer:
# Discard buffer if it's too small
if self._input_buffer == ffi.NULL or self._input_buffer_size < data_size:
# Create new buffer
self._input_buffer = _new_nonzero("char[]", data_size)
if self._input_buffer == ffi.NULL:
self._input_buffer_size = 0
raise MemoryError
# Set buffer size
self._input_buffer_size = data_size
# Copy unconsumed data
ffi.memmove(self._input_buffer, in_buf.src + in_buf.pos, data_size)
self._in_begin = 0
self._in_end = data_size
else:
# Use input buffer
self._in_begin += in_buf.pos
else:
raise PpmdError("Wrong status: input buffer overrun.")
class Ppmd7Encoder(PpmdBaseEncoder):
def __init__(self, max_order: int, mem_size: int):
if mem_size > sys.maxsize:
raise ValueError("Mem_size exceed to platform limit.")
if (_PPMD7_MIN_ORDER > max_order or max_order > _PPMD7_MAX_ORDER) or (
_PPMD7_MIN_MEM_SIZE > mem_size or mem_size > _PPMD7_MAX_MEM_SIZE
):
raise ValueError("PPMd wrong parameters.")
self._init_common()
self.ppmd = ffi.new("CPpmd7 *")
self.rc = ffi.new("CPpmd7z_RangeEnc *")
lib.ppmd7_state_init(self.ppmd, max_order, mem_size, self._allocator)
lib.ppmd7_compress_init(self.rc, self.writer)
def encode(self, data) -> bytes:
self.lock.acquire()
in_buf = self._setup_inBuffer(data)
out, out_buf = self._setup_outBuffer()
while True:
if lib.ppmd7_compress(self.ppmd, self.rc, out_buf, in_buf) == 0:
break # Finished
# Output buffer should be exhausted, grow the buffer.
if out_buf.pos == out_buf.size:
out.grow(out_buf)
self.lock.release()
return out.finish(out_buf)
def flush(self, *, endmark=False) -> bytes:
if self.flushed:
raise ("Ppmd7Encoder: Double flush error.")
self.lock.acquire()
self.flushed = True
out, out_buf = self._setup_outBuffer()
lib.ppmd7_compress_flush(self.ppmd, self.rc, endmark)
res = out.finish(out_buf)
lib.ppmd7_state_close(self.ppmd, self._allocator)
ffi.release(self.ppmd)
self._release()
ffi.release(self.rc)
self.lock.release()
return res
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if not self.flushed:
self.flush()
class Ppmd7Decoder(PpmdBaseDecoder):
def __init__(self, max_order: int, mem_size: int):
if mem_size > sys.maxsize:
raise ValueError("Mem_size exceed to platform limit.")
if _PPMD7_MIN_ORDER <= max_order <= _PPMD7_MAX_ORDER and _PPMD7_MIN_MEM_SIZE <= mem_size <= _PPMD7_MAX_MEM_SIZE:
self.lock = Lock()
self._init_common()
self.ppmd = ffi.new("CPpmd7 *")
self.rc = ffi.new("CPpmd7z_RangeDec *")
self.threadInfo = ffi.new("ppmd_info *")
self._eof = False
self._finished = False
self._needs_input = True
lib.ppmd7_state_init(self.ppmd, max_order, mem_size, self._allocator)
else:
raise ValueError("PPMd wrong parameters.")
def decode(self, data: Union[bytes, bytearray, memoryview], length: int) -> bytes:
if not isinstance(length, int) or length < 0:
raise PpmdError("Wrong length argument is specified. It should be positive integer.")
self.lock.acquire()
in_buf, use_input_buffer = self._setup_inBuffer(data)
if not self.inited:
lib.ppmd7_decompress_init(self.rc, self.reader, self.threadInfo, self._allocator)
self.inited = True
out, out_buf = self._setup_outBuffer()
remaining: int = length
out_size = 0
while remaining > 0:
size = min(out_buf.size, remaining)
self.lock.release()
out_size = lib.ppmd7_decompress(self.ppmd, self.rc, out_buf, in_buf, size, self.threadInfo)
self.lock.acquire()
if out_size == -2:
self.lock.release()
raise PpmdError("DecodeError.")
if out_size == -1 or self.rc.Code == 0:
self._eof = True
self._needs_input = False
break
if out_size == 0:
self._needs_input = True
break
if out_buf.pos == out_buf.size:
out.grow(out_buf)
remaining = remaining - out_size
self._unconsumed_in(in_buf, use_input_buffer)
res = out.finish(out_buf)
self.lock.release()
return res
@property
def needs_input(self):
return self._needs_input
@property
def eof(self):
return self._eof
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if self._finished:
return
self._finished = True
lib.Ppmd7T_Free(self.ppmd, self.threadInfo, self._allocator)
ffi.release(self.ppmd)
ffi.release(self.rc)
self._release()
self._needs_input = False
self.lock.release()
class Ppmd8Encoder(PpmdBaseEncoder):
def __init__(self, max_order, mem_size, restore_method=PPMD8_RESTORE_METHOD_RESTART):
self.lock = Lock()
if mem_size > sys.maxsize:
raise ValueError("Mem_size exceed to platform limit.")
self._init_common()
self.ppmd = ffi.new("CPpmd8 *")
lib.ppmd8_compress_init(self.ppmd, self.writer)
lib.Ppmd8_Construct(self.ppmd)
lib.Ppmd8_Alloc(self.ppmd, mem_size, self._allocator)
lib.Ppmd8_RangeEnc_Init(self.ppmd)
lib.Ppmd8_Init(self.ppmd, max_order, restore_method)
def encode(self, data) -> bytes:
self.lock.acquire()
in_buf = self._setup_inBuffer(data)
out, out_buf = self._setup_outBuffer()
while lib.ppmd8_compress(self.ppmd, out_buf, in_buf) > 0:
if out_buf.pos == out_buf.size:
out.grow(out_buf)
self.lock.release()
return out.finish(out_buf)
def flush(self, endmark=True) -> bytes:
self.lock.acquire()
if self.flushed:
self.lock.release()
return
self.flushed = True
out, out_buf = self._setup_outBuffer()
if endmark:
lib.Ppmd8_EncodeSymbol(self.ppmd, -1)
lib.Ppmd8_RangeEnc_FlushData(self.ppmd)
res = out.finish(out_buf)
lib.Ppmd8_Free(self.ppmd, self._allocator)
ffi.release(self.ppmd)
self._release()
self.lock.release()
return res
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if not self.flushed:
self.flush()
class Ppmd8Decoder(PpmdBaseDecoder):
def __init__(self, max_order: int, mem_size: int, restore_method=PPMD8_RESTORE_METHOD_RESTART):
self._init_common()
self.ppmd = ffi.new("CPpmd8 *")
self.threadInfo = ffi.new("ppmd_info *")
lib.Ppmd8_Construct(self.ppmd)
lib.Ppmd8_Alloc(self.ppmd, mem_size, self._allocator)
lib.Ppmd8_Init(self.ppmd, max_order, restore_method)
self._inited = False
self._eof = False
self._needs_input = True
self._finished = False
def _init2(self):
lib.ppmd8_decompress_init(self.ppmd, self.reader, self.threadInfo, self._allocator)
lib.Ppmd8_RangeDec_Init(self.ppmd)
def decode(self, data: Union[bytes, bytearray, memoryview], length: int = -1):
if not isinstance(length, int):
raise PpmdError("Wrong length argument is specified.")
self.lock.acquire()
# If EOF already reached in a previous call, subsequent decode calls
# should be no-ops and return empty bytes without touching freed/native state.
if getattr(self, "_eof", False):
self.lock.release()
return b""
in_buf, use_input_buffer = self._setup_inBuffer(data)
out, out_buf = self._setup_outBuffer()
self.threadInfo.out = out_buf
if not self._inited:
self._inited = True
self._init2()
if length < 0:
length = 0x7FFFFFFF
while True:
if out_buf.pos == length:
break
if out_buf.pos == out_buf.size:
out.grow(out_buf)
self.lock.release()
size = lib.ppmd8_decompress(self.ppmd, out_buf, in_buf, length, self.threadInfo)
self.lock.acquire()
if size == -1:
self._eof = True
self._needs_input = False
res = out.finish(out_buf)
self.lock.release()
return res
elif size == -2:
raise ValueError("Corrupted archive data.")
if in_buf.pos == in_buf.size:
break
self._unconsumed_in(in_buf, use_input_buffer)
if self._eof:
self._needs_input = False
elif self._input_buffer_size == 0 or (self._in_begin == self._in_end):
self._needs_input = True
else:
self._needs_input = False
res = out.finish(out_buf)
self.lock.release()
return res
def _free(self):
if self._finished:
return
self._finished = True
lib.Ppmd8T_Free(self.ppmd, self.threadInfo, self._allocator)
ffi.release(self.ppmd)
self._release()
@property
def needs_input(self):
return self._needs_input
@property
def eof(self):
return self._eof
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self._free()
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