273 lines
5.9 KiB
Ruby
273 lines
5.9 KiB
Ruby
# encoding: UTF-8
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# --
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# Copyright (C) 2008-2010 10gen Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ++
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# A byte buffer.
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module BSON
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class ByteBuffer
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attr_reader :order
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def initialize(initial_data="")
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if initial_data.is_a?(String)
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if initial_data.respond_to?(:force_encoding)
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@str = initial_data.force_encoding('binary')
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else
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@str = initial_data
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end
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else
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@str = initial_data.pack('C*')
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end
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@cursor = @str.length
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@order = :little_endian
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@int_pack_order = 'V'
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@double_pack_order = 'E'
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end
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if RUBY_VERSION >= '1.9'
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NULL_BYTE = "\0".force_encoding('binary').freeze
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UTF8_ENCODING = Encoding.find('utf-8')
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BINARY_ENCODING = Encoding.find('binary')
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def self.to_utf8_binary(str)
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str.encode(UTF8_ENCODING).force_encoding(BINARY_ENCODING)
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end
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else
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NULL_BYTE = "\0"
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def self.to_utf8_binary(str)
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begin
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str.unpack("U*")
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rescue => ex
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raise InvalidStringEncoding, "String not valid utf-8: #{str.inspect}"
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end
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str
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end
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end
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def self.serialize_cstr(buf, val)
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buf.append!(to_utf8_binary(val.to_s))
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buf.append!(NULL_BYTE)
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end
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# +endianness+ should be :little_endian or :big_endian. Default is :little_endian
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def order=(endianness)
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@order = endianness
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@int_pack_order = endianness == :little_endian ? 'V' : 'N'
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@double_pack_order = endianness == :little_endian ? 'E' : 'G'
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end
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def rewind
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@cursor = 0
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end
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def position
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@cursor
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end
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def position=(val)
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@cursor = val
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end
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def clear
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@str = ""
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@str.force_encoding('binary') if @str.respond_to?(:force_encoding)
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rewind
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end
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def size
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@str.size
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end
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alias_method :length, :size
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# Appends a second ByteBuffer object, +buffer+, to the current buffer.
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def append!(buffer)
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@str << buffer.to_s
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self
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end
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# Prepends a second ByteBuffer object, +buffer+, to the current buffer.
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def prepend!(buffer)
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@str = buffer.to_s + @str
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self
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end
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def put(byte, offset=nil)
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@cursor = offset if offset
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if more?
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@str[@cursor] = chr(byte)
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else
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ensure_length(@cursor)
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@str << chr(byte)
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end
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@cursor += 1
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end
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def put_binary(data, offset=nil)
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@cursor = offset if offset
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if defined?(BINARY_ENCODING)
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data = data.dup.force_encoding(BINARY_ENCODING)
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end
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if more?
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@str[@cursor, data.length] = data
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else
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ensure_length(@cursor)
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@str << data
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end
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@cursor += data.length
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end
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def put_array(array, offset=nil)
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@cursor = offset if offset
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if more?
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@str[@cursor, array.length] = array.pack("C*")
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else
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ensure_length(@cursor)
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@str << array.pack("C*")
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end
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@cursor += array.length
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end
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def put_int(i, offset=nil)
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@cursor = offset if offset
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if more?
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@str[@cursor, 4] = [i].pack(@int_pack_order)
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else
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ensure_length(@cursor)
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@str << [i].pack(@int_pack_order)
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end
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@cursor += 4
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end
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def put_long(i, offset=nil)
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offset = @cursor unless offset
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if @int_pack_order == 'N'
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put_int(i >> 32, offset)
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put_int(i & 0xffffffff, offset + 4)
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else
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put_int(i & 0xffffffff, offset)
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put_int(i >> 32, offset + 4)
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end
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end
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def put_double(d, offset=nil)
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a = []
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[d].pack(@double_pack_order).each_byte { |b| a << b }
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put_array(a, offset)
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end
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# If +size+ == nil, returns one byte. Else returns array of bytes of length
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# # +size+.
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if "x"[0].is_a?(Integer)
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def get(len=nil)
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one_byte = len.nil?
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len ||= 1
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check_read_length(len)
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start = @cursor
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@cursor += len
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if one_byte
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@str[start]
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else
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@str[start, len].unpack("C*")
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end
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end
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else
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def get(len=nil)
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one_byte = len.nil?
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len ||= 1
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check_read_length(len)
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start = @cursor
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@cursor += len
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if one_byte
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@str[start, 1].ord
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else
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@str[start, len].unpack("C*")
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end
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end
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end
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def get_int
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check_read_length(4)
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vals = @str[@cursor..@cursor+3]
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@cursor += 4
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vals.unpack(@int_pack_order)[0]
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end
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def get_long
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i1 = get_int
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i2 = get_int
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if @int_pack_order == 'N'
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(i1 << 32) + i2
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else
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(i2 << 32) + i1
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end
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end
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def get_double
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check_read_length(8)
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vals = @str[@cursor..@cursor+7]
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@cursor += 8
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vals.unpack(@double_pack_order)[0]
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end
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def more?
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@cursor < @str.size
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end
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def to_a
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@str.unpack("C*")
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end
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def unpack(args)
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to_a
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end
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def to_s
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@str
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end
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def dump
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i = 0
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@str.each_byte do |c, i|
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$stderr.puts "#{'%04d' % i}: #{'%02x' % c} #{'%03o' % c} #{'%s' % c.chr} #{'%3d' % c}"
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i += 1
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end
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end
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private
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def ensure_length(length)
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if @str.size < length
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@str << NULL * (length - @str.size)
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end
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end
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def chr(byte)
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if byte < 0
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[byte].pack('c')
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else
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byte.chr
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end
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end
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def check_read_length(len)
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raise "attempt to read past end of buffer" if @cursor + len > @str.length
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end
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end
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end
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