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module Plum
module BinaryString
refine String do
# Reads a 8-bit unsigned integer.
# @param pos [Integer] The start position to read.
def uint8(pos = 0)
byteslice(pos, 1).unpack("C")[0]
end
# Reads a 16-bit unsigned integer.
# @param pos [Integer] The start position to read.
def uint16(pos = 0)
byteslice(pos, 2).unpack("n")[0]
end
# Reads a 24-bit unsigned integer.
# @param pos [Integer] The start position to read.
def uint24(pos = 0)
(uint16(pos) << 8) | uint8(pos + 2)
end
# Reads a 32-bit unsigned integer.
# @param pos [Integer] The start position to read.
def uint32(pos = 0)
byteslice(pos, 4).unpack("N")[0]
end
# Appends a 8-bit unsigned integer to this string.
def push_uint8(val)
self << [val].pack("C")
end
# Appends a 16-bit unsigned integer to this string.
def push_uint16(val)
self << [val].pack("n")
end
# Appends a 24-bit unsigned integer to this string.
def push_uint24(val)
push_uint16(val >> 8)
push_uint8(val & ((1 << 8) - 1))
end
# Appends a 32-bit unsigned integer to this string.
def push_uint32(val)
self << [val].pack("N")
end
alias push <<
# Takes from beginning and cut specified *octets* from this String.
# @param count [Integer] The amount.
def byteshift(count)
force_encoding(Encoding::BINARY)
slice!(0, count)
end
def each_byteslice(n, &blk)
if block_given?
pos = 0
while pos < self.bytesize
yield byteslice(pos, n)
pos += n
end
else
Enumerator.new do |y|
each_byteslice(n) {|ss| y << ss }
end
# I want to write `enum_for(__method__, n)`!
end
end
end
end
end
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