在Ruby中将基数为2的数字字符串数组写入二进制文件 [英] Write array of radix-2 numeric strings to binary file in Ruby

问题描述

我在Ruby中编写了一个简单的霍夫曼编码。作为输出，我有一个数组，例如：

I've written a simple Huffman encoding in Ruby. As output I've got an array, for example:

["010", "1111", "10", "10", "110", "1110", "001", "110", "000", "10", "011"]

我需要在文件中写入，然后读取文件。我尝试了几种方法：

I need to write, and then read, it to and from a file. I tried several methods:

IO.binwrite("out.cake", array)

我得到一个简单的文本文件，而不是二进制文件。

I get a simple text file and not binary.

或者：

File.open("out.cake", 'wb' ) do |output|
  array.each do | byte |
       output.print byte.chr
  end
end

其中看起来它有效，但后来我无法将其读入数组。

Which looks like it works, but then I can't read it into array.

我应该使用哪种编码？

推荐答案

我认为你可以使用 Array＃pack 和 String＃unpack 如下代码：

I think you can just use Array#pack and String#unpack like the following code:

# Writing
a = ["010", "1111", "10", "10", "110", "1110", "001", "110", "000", "10", "011"]
File.open("out.cake", 'wb' ) do |output|
  output.write [a.join].pack("B*")
end

# Reading
s = File.binread("out.cake")
bits = s.unpack("B*")[0] # "01011111010110111000111000010011"

我不知道您阅读结果的首选格式，我知道上述方法效率低下。但无论如何，你可以从 unpack 的结果顺序取0或1来遍历你的霍夫曼树。

I don't know your preferred format for the result of reading and I know the above method is inefficient. But anyway you can take "0" or "1" sequentially from the result of unpack to traverse your Huffman tree.

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