[問題] Encoding of binary data

[aMaa (aMa)]

我要照一個文件所述的需求,完成一個功能,如下:
我實在愚笨 看了好幾天仍不能了解它encode,decode規則是如何...orz
這是用在websocket send/recievd binary data時要求的:

Where binary data is returned from this API,
it is encoded as follows:
It is converted to a string by converting each byte in turn using these rules:
a. Bytes 0x20 to 0x24 inclusive are mapped to the corresponding characters
     U+0020 to U+0024 inclusive.
b. Bytes 0x26 to 0x7E inclusive are mapped to the corresponding characters
     U+0026 to U+007E inclusive.
c. Other bytes are mapped to the three character sequence consisting of a percent character followed by two uppercase hex characters,
     e.g. byte 0 maps to “%00” and byte 0xAB maps to “%AB”.



Where binary data is passed into this API,
it is passed as a string which is decoded as follows:
a. Characters U+0020 to U+0024 inclusive are mapped to the corresponding
     bytes 0x20 to 0x24 inclusive.
b. Characters U+0026 to U+007E inclusive are mapped to the corresponding
     bytes 0x26 to 0x7E inclusive.
c. The three character sequence consisting of a percent character followed
     by two uppercase hex characters maps to the corresponding byte,
     e.g. “%00” maps to byte 0 and “%AB” maps to byte 0xAB.
d. A percent character that is not followed by two uppercase hex characters
     means the string is malformed.
e. If the string contains a character outside the range U+0020 to U+007E
     inclusive then the string is malformed

可否各位強者能給我一些意見, 上網找了一些編碼資料仍一頭霧水...
Thanks

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推 tiefblau: 是作業嗎? 一般編碼沒關係 自定義規則叫你處理而已
→ tiefblau: a,b就是直接弄成0x的byte就好 中間跳一個U+0025就是%
→ tiefblau: %是特殊規則 收到%接著兩個大寫hex就是map到0x多少多少
→ aMaa: 不是作業,是工作上project中的一個資料處理需求,它自定義的
→ tiefblau: 如果收到這之外的 就是api壞了
→ aMaa: 規則是什麼, 我看不懂/_\ 如果string是hello world, 是轉成?
→ AndCycle: 你看一下ascii table對照一下就知道他想幹嘛了