//! Text conversion utilities.

/// Formats a binary size string for any given number.
pub fn to_binsize(n: u64) -> String
{
   let names = ["kB", "MB", "GB", "TB"];

   // empty size
   if n == 0 {return String::from("empty")}

   // terabytes, gigabytes, megabytes, kilobytes
   for i in 4..=1
   {
      if n >= 1000u64.pow(i)
      {
         let x = n as f64 / 1000f64.powi(i as i32);
         return format!("{:1}{}", x, names[i as usize - 1])
      }
   }

   // or, just bytes
   format!("{} {}", n, if n != 1 {"bytes"} else {"byte"})
}

/// Encodes or decodes a string in the terminal encryption format.
pub fn fuck_string(s: &[u8]) -> Vec<u8>
{
   let mut v = s.to_vec();
   let     l = s.len();
   let mut p = 0;

   for _ in 0..l / 4 {p += 2; v[p] ^= 0xfe; v[p + 1] ^= 0xed; p += 2}
   for _ in 0..l % 4 {v[p] ^= 0xfe; p += 1}

   v
}

/// Converts input from Mac Roman to a Unicode string.
pub fn mac_roman_conv(s: &[u8]) -> String
{
   let tr = [
      '\u{00c4}', '\u{00c5}', '\u{00c7}', '\u{00c9}',
      '\u{00d1}', '\u{00d6}', '\u{00dc}', '\u{00e1}',
      '\u{00e0}', '\u{00e2}', '\u{00e4}', '\u{00e3}',
      '\u{00e5}', '\u{00e7}', '\u{00e9}', '\u{00e8}',
      '\u{00ea}', '\u{00eb}', '\u{00ed}', '\u{00ec}',
      '\u{00ee}', '\u{00ef}', '\u{00f1}', '\u{00f3}',
      '\u{00f2}', '\u{00f4}', '\u{00f6}', '\u{00f5}',
      '\u{00fa}', '\u{00f9}', '\u{00fb}', '\u{00fc}',
      '\u{2020}', '\u{00b0}', '\u{00a2}', '\u{00a3}',
      '\u{00a7}', '\u{2022}', '\u{00b6}', '\u{00df}',
      '\u{00ae}', '\u{00a9}', '\u{2122}', '\u{00b4}',
      '\u{00a8}', '\u{2260}', '\u{00c6}', '\u{00d8}',
      '\u{221e}', '\u{00b1}', '\u{2264}', '\u{2265}',
      '\u{00a5}', '\u{00b5}', '\u{2202}', '\u{2211}',
      '\u{220f}', '\u{03c0}', '\u{222b}', '\u{00aa}',
      '\u{00ba}', '\u{03a9}', '\u{00e6}', '\u{00f8}',
      '\u{00bf}', '\u{00a1}', '\u{00ac}', '\u{221a}',
      '\u{0192}', '\u{2248}', '\u{2206}', '\u{00ab}',
      '\u{00bb}', '\u{2026}', '\u{00a0}', '\u{00c0}',
      '\u{00c3}', '\u{00d5}', '\u{0152}', '\u{0153}',
      '\u{2013}', '\u{2014}', '\u{201c}', '\u{201d}',
      '\u{2018}', '\u{2019}', '\u{00f7}', '\u{25ca}',
      '\u{00ff}', '\u{0178}', '\u{2044}', '\u{20ac}',
      '\u{2039}', '\u{203a}', '\u{fb01}', '\u{fb02}',
      '\u{2021}', '\u{00b7}', '\u{201a}', '\u{201e}',
      '\u{2030}', '\u{00c2}', '\u{00ca}', '\u{00c1}',
      '\u{00cb}', '\u{00c8}', '\u{00cd}', '\u{00ce}',
      '\u{00cf}', '\u{00cc}', '\u{00d3}', '\u{00d4}',
      '\u{f8ff}', '\u{00d2}', '\u{00da}', '\u{00db}',
      '\u{00d9}', '\u{0131}', '\u{02c6}', '\u{02dc}',
      '\u{00af}', '\u{02d8}', '\u{02d9}', '\u{02da}',
      '\u{00b8}', '\u{02dd}', '\u{02db}', '\u{02c7}'
   ];

   let     l = s.len();
   let mut v = String::with_capacity(l);

   for i in 0..l
   {
      if s[i] == 0 {break}

           if s[i] & 0x80 != 0 {v.push(tr[s[i] as usize & 0x7f])}
      else if s[i] == b'\r'    {v.push('\n')}
      else                     {v.push(s[i] as char)}
   }

   v
}

// EOF