diff --git a/blocksfree/buffer/bytebuffer.py b/blocksfree/buffer/bytebuffer.py
new file mode 100644
index 0000000..d25db8e
--- /dev/null
+++ b/blocksfree/buffer/bytebuffer.py
@@ -0,0 +1,118 @@
+# vim: set tabstop=4 shiftwidth=4 noexpandtab filetype=python:
+
+# Copyright (C) 2017  T. Joseph Carter
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+from typing import Optional, Union
+from .buffertype import BufferType
+
+class ByteBuffer(BufferType):
+	"""ByteBuffer(bytes_or_int[, changed[, locked]]) -> ByteBuffer
+
+	Create a BufferType object in memory.  If an int is provided, the buffer
+	will be zero-filled.  If it is a bytes-type object, the object will be
+	copied into the buffer.
+	"""
+
+	def __init__(
+			self,
+			bytes_or_int: Union[bytes,int],
+			changed: bool = False,
+			locked: bool = False
+			) -> None:
+		self._buf = bytearray(bytes_or_int)
+		self._changed = changed
+		self._locked = locked
+
+	def __len__(self) -> int:
+		"""Return len(self)"""
+		return len(self._buf)
+
+	def read(
+			self,
+			start: int = 0,
+			count: Optional[int] = None,
+			limit: bool = True
+			) -> bytearray:
+		"""Return bytearray of count bytes from buffer beginning at start
+
+		By default, an IndexError will be raised if you read past the end of
+		the buffer.  Pass limit=False if reads outside the buffer should just
+		return trncated or empty results as with python slicing
+		"""
+		if count is None:
+			count = len(self)
+		try:
+			assert(start >= 0)
+			assert(count >= 0)
+			if limit == True:
+				assert(start + count <= len(self._buf))
+		except AssertionError:
+			raise IndexError('buffer read with index out of range')
+		return bytes(self._buf[start:start + count])
+
+	def write(
+			self,
+			buf: bytes,
+			start: int,
+			count: Optional[int] = None,
+			limit: bool = True
+			) -> None:
+		"""Writes bytes to buffer beginning at start
+
+		If count is not supplied, the entire bytes-like object will be written
+		to the buffer.  An IndexError will be raised if the write would extend
+		past the end of the buffer.  Pass limit=False
+		"""
+		if self.locked:
+			raise BufferError('cannot write to locked buffer')
+
+		if not count:
+			count = len(buf)
+		try:
+			assert(start >= 0)
+			assert(count >= 0)
+			if limit == True:
+				assert(start + count <= len(self._buf))
+		except AssertionError:
+			raise IndexError('buffer write with index out of range')
+
+		self._buf[start:start+count] = buf
+		self._changed = True
+
+	def resize(self, size):
+		"""Resize buffer to size
+
+		If size is larger than len(self), the buffer is appended with zero
+		bytes.  If it is smaller, the buffer will be truncated.
+		"""
+		if self.locked:
+			raise BufferError('cannot write to locked buffer')
+
+		if size <= len(self._buf):
+			del self._buf[size:]
+		else:
+			self._buf.append(bytes(size - len(self._buf)))
+		self._changed = True
+
+	@property
+	def locked(self):
+		"""Returns True for read-only buffers."""
+		return self._locked
+
+	@locked.setter
+	def locked(self, value: bool) -> None:
+		self._locked = value