//! Text conversion utilities.

/// Dumps a slice of memory as text to stderr.
pub fn dump_mem(b: &[u8])
{
   let mut p = 0;

   for &c in b {
      if p + 3 > 79 {
         eprintln!("");
         p = 0;
      }

      if c.is_ascii_graphic() {
         eprint!(" {} ", c as char);
      } else {
         eprint!("{:02X} ", c);
      }

      p += 3;
   }

   eprintln!("");
}

/// Formats a binary size string for any given number.
pub fn to_binsize(n: u64) -> String
{
   const NAMES: [&str; 4] = ["kB", "MB", "GB", "TB"];

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

   // terabytes, gigabytes, megabytes, kilobytes
   for i in (1..=4).rev() {
      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 mut v = String::with_capacity(s.len());

   for i in 0..s.len() {
      if s[i] == 0 {
         break;
      } else 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
}

const TR: [char; 128] =
   ['\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}'];

#[test]
fn to_binsize_integrals()
{
   assert_eq!(to_binsize(0), "empty");
   assert_eq!(to_binsize(1), "1 byte");
   assert_eq!(to_binsize(2), "2 bytes");
   assert_eq!(to_binsize(999), "999 bytes");
   assert_eq!(to_binsize(1000), "1kB");
   assert_eq!(to_binsize(1000 * 7), "7kB");
   assert_eq!(to_binsize(1000 * 1000), "1MB");
   assert_eq!(to_binsize(1000 * 1000 * 7), "7MB");
   assert_eq!(to_binsize(1000 * 1000 * 1000), "1GB");
   assert_eq!(to_binsize(1000 * 1000 * 1000 * 7), "7GB");
   assert_eq!(to_binsize(1000 * 1000 * 1000 * 1000), "1TB");
   assert_eq!(to_binsize(1000 * 1000 * 1000 * 1000 * 7), "7TB");
}

#[test]
fn mac_roman_conv_basic_marathon_stuff()
{
   assert_eq!(mac_roman_conv(b"p\x8cth"), "påth");
   assert_eq!(mac_roman_conv(b"I\xd5ve"), "I’ve");
}

// EOF