// GameCube font tool
// Copyright 2015 Dolphin Emulator Project
// Copyright 2015 James Cowgill <james410@cowgill.org.uk>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Compile with:
//  g++ -O2 -std=c++11 $(freetype-config --cflags --libs) gc-font-tool.cpp

// Yay0
// ===============
// Yay0 is the binary compression format used in game cube font files.
// It is heavily based on LZ77 (used by DEFLATE).
// HEADER
//  0 Yay0 magic number
//  4 Size of data uncompressed
//  8 Offset to "link" table
//  C Offset to "chunks" table
//
// MASK TABLE
//  The mask table immediately follows the header (so there is no offset to it)
//  Each byte is a bitmask specifying the type of data to read next. If the bit
//  is 1, one byte should be read from the chunks table. If the bit is 0, a link
//  from the links table should be read.
//
// CHUNKS TABLE
//  This table contains binary data copied into the output stream by the mask
//  table, and counters for large links. Each time bytes are read from this
//  table, the chunks offset is incremented (bytes are only ever used once).
//
// LINK TABLE
//  The link table contains references to blocks of previously decompressed data.
//  Each link is 2 bytes long in the format:
//   CCOO OOOO
//  Where (C+2) is the count of bytes in the link and (O+1) is the offset
//  backwards in the already decompressed data to read from. If C == 0, the
//  number of bytes in the link is read from the chunks table and 18 is added
//  to it.
//
// Font Format
// ===============
// 00 Font type (0 = Windows-1252, 2 = Windows-31J)
// 02 First character
// 04 Last character
// 06 Invalid character
// 08 Ascent
// 0A Decent
// 0C Width of widest character
// 0E Leading space
// 10 Cell width
// 12 Cell height
// 14 Texture size
// 18 Texture format
// 1A Texture columns
// 1C Texture rows
// 1E Texture width
// 20 Texture height
// 22 Offset to character widths table
// 24 Offset to tile data
// 28 Tile data size
// 2A Greyscale colour for 0 values
// 2B Greyscale colour for 1 values
// 2C Greyscale colour for 2 values
// 2D Greyscale colour for 3 values
//  This program ignores these values and justs assumes it uses the linear
//  4-bit colours: 00, 55, AA, FF (FIXME?)
//
// Font data is encoded in 2 bit greyscale and in 8x8 blocks.

#include <cerrno>
#include <cstring>
#include <fstream>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <vector>

#include <ft2build.h>
#include FT_FREETYPE_H

using std::size_t;
using std::uint8_t;
using std::uint16_t;
using std::uint32_t;

// Font parameters
const int FNT_CELL_SIZE = 24;
const int FNT_RENDER_SIZE = FNT_CELL_SIZE * 5 / 6;
const int FNT_CELLS_PER_ROW = 21;
const int FNT_PIXMAP_WIDTH = 512; // Must be >= CELL_SIZE * CELLS_PER_ROW

// The two types of font which can be generated
enum class font_type
{
	windows_1252,
	shift_jis,
};

#define SEQUENCE_4(x) (x), (x)+1, (x)+2, (x)+3
#define SEQUENCE_8(x) SEQUENCE_4(x), SEQUENCE_4((x)+4)
#define SEQUENCE_16(x) SEQUENCE_8(x), SEQUENCE_8((x)+8)
#define SEQUENCE_32(x) SEQUENCE_16(x), SEQUENCE_16((x)+16)
#define SEQUENCE_64(x) SEQUENCE_32(x), SEQUENCE_32((x)+32)

// List of unicode codepoints appearing in the Windows-1252 font
const uint16_t windows_1252_font_table[] =
{
	SEQUENCE_32(0x20),
	SEQUENCE_64(0x40),

	0x20AC,      0, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
	0x02C6, 0x2030, 0x0160, 0x2039, 0x0152,      0, 0x017D,      0,
	     0, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
	0x02DC, 0x2122, 0x0161, 0x203A, 0x0153,      0, 0x017E, 0x0178,
	SEQUENCE_32(0xA0),
	SEQUENCE_64(0xC0),
};

// List of unicode codepoints appearing in the Shift JIS font
const uint16_t shift_jis_font_table[] =
{
	// Starts at Shift JIS 0x8740. Any holes are skipped over.
	0x3000, 0x3001, 0x3002, 0xFF0C, 0xFF0E, 0x30FB, 0xFF1A, 0xFF1B,
	0xFF1F, 0xFF01, 0x309B, 0x309C, 0x00B4, 0xFF40, 0x00A8, 0xFF3E,
	0xFFE3, 0xFF3F, 0x30FD, 0x30FE, 0x309D, 0x309E, 0x3003, 0x4EDD,
	0x3005, 0x3006, 0x3007, 0x30FC, 0x2015, 0x2010, 0xFF0F, 0xFF3C,
	0xFF5E, 0x2225, 0xFF5C, 0x2026, 0x2025, 0x2018, 0x2019, 0x201C,
	0x201D, 0xFF08, 0xFF09, 0x3014, 0x3015, 0xFF3B, 0xFF3D, 0xFF5B,
	0xFF5D, 0x3008, 0x3009, 0x300A, 0x300B, 0x300C, 0x300D, 0x300E,
	0x300F, 0x3010, 0x3011, 0xFF0B, 0xFF0D, 0x00B1, 0x00D7, 0x00F7,
	0xFF1D, 0x2260, 0xFF1C, 0xFF1E, 0x2266, 0x2267, 0x221E, 0x2234,
	0x2642, 0x2640, 0x00B0, 0x2032, 0x2033, 0x2103, 0xFFE5, 0xFF04,
	0xFFE0, 0xFFE1, 0xFF05, 0xFF03, 0xFF06, 0xFF0A, 0xFF20, 0x00A7,
	0x2606, 0x2605, 0x25CB, 0x25CF, 0x25CE, 0x25C7, 0x25C6, 0x25A1,
	0x25A0, 0x25B3, 0x25B2, 0x25BD, 0x25BC, 0x203B, 0x3012, 0x2192,
	0x2190, 0x2191, 0x2193, 0x3013, 0x2208, 0x220B, 0x2286, 0x2287,
	0x2282, 0x2283, 0x222A, 0x2229, 0x2227, 0x2228, 0xFFE2, 0x21D2,
	0x21D4, 0x2200, 0x2203, 0x2220, 0x22A5, 0x2312, 0x2202, 0x2207,
	0x2261, 0x2252, 0x226A, 0x226B, 0x221A, 0x223D, 0x221D, 0x2235,
	0x222B, 0x222C, 0x212B, 0x2030, 0x266F, 0x266D, 0x266A, 0x2020,
	0x2021, 0x00B6, 0x25EF, 0xFF10, 0xFF11, 0xFF12, 0xFF13, 0xFF14,
	0xFF15, 0xFF16, 0xFF17, 0xFF18, 0xFF19, 0xFF21, 0xFF22, 0xFF23,
	0xFF24, 0xFF25, 0xFF26, 0xFF27, 0xFF28, 0xFF29, 0xFF2A, 0xFF2B,
	0xFF2C, 0xFF2D, 0xFF2E, 0xFF2F, 0xFF30, 0xFF31, 0xFF32, 0xFF33,
	0xFF34, 0xFF35, 0xFF36, 0xFF37, 0xFF38, 0xFF39, 0xFF3A, 0xFF41,
	0xFF42, 0xFF43, 0xFF44, 0xFF45, 0xFF46, 0xFF47, 0xFF48, 0xFF49,
	0xFF4A, 0xFF4B, 0xFF4C, 0xFF4D, 0xFF4E, 0xFF4F, 0xFF50, 0xFF51,
	0xFF52, 0xFF53, 0xFF54, 0xFF55, 0xFF56, 0xFF57, 0xFF58, 0xFF59,
	0xFF5A, 0x3041, 0x3042, 0x3043, 0x3044, 0x3045, 0x3046, 0x3047,
	0x3048, 0x3049, 0x304A, 0x304B, 0x304C, 0x304D, 0x304E, 0x304F,
	0x3050, 0x3051, 0x3052, 0x3053, 0x3054, 0x3055, 0x3056, 0x3057,
	0x3058, 0x3059, 0x305A, 0x305B, 0x305C, 0x305D, 0x305E, 0x305F,
	0x3060, 0x3061, 0x3062, 0x3063, 0x3064, 0x3065, 0x3066, 0x3067,
	0x3068, 0x3069, 0x306A, 0x306B, 0x306C, 0x306D, 0x306E, 0x306F,
	0x3070, 0x3071, 0x3072, 0x3073, 0x3074, 0x3075, 0x3076, 0x3077,
	0x3078, 0x3079, 0x307A, 0x307B, 0x307C, 0x307D, 0x307E, 0x307F,
	0x3080, 0x3081, 0x3082, 0x3083, 0x3084, 0x3085, 0x3086, 0x3087,
	0x3088, 0x3089, 0x308A, 0x308B, 0x308C, 0x308D, 0x308E, 0x308F,
	0x3090, 0x3091, 0x3092, 0x3093, 0x30A1, 0x30A2, 0x30A3, 0x30A4,
	0x30A5, 0x30A6, 0x30A7, 0x30A8, 0x30A9, 0x30AA, 0x30AB, 0x30AC,
	0x30AD, 0x30AE, 0x30AF, 0x30B0, 0x30B1, 0x30B2, 0x30B3, 0x30B4,
	0x30B5, 0x30B6, 0x30B7, 0x30B8, 0x30B9, 0x30BA, 0x30BB, 0x30BC,
	0x30BD, 0x30BE, 0x30BF, 0x30C0, 0x30C1, 0x30C2, 0x30C3, 0x30C4,
	0x30C5, 0x30C6, 0x30C7, 0x30C8, 0x30C9, 0x30CA, 0x30CB, 0x30CC,
	0x30CD, 0x30CE, 0x30CF, 0x30D0, 0x30D1, 0x30D2, 0x30D3, 0x30D4,
	0x30D5, 0x30D6, 0x30D7, 0x30D8, 0x30D9, 0x30DA, 0x30DB, 0x30DC,
	0x30DD, 0x30DE, 0x30DF, 0x30E0, 0x30E1, 0x30E2, 0x30E3, 0x30E4,
	0x30E5, 0x30E6, 0x30E7, 0x30E8, 0x30E9, 0x30EA, 0x30EB, 0x30EC,
	0x30ED, 0x30EE, 0x30EF, 0x30F0, 0x30F1, 0x30F2, 0x30F3, 0x30F4,
	0x30F5, 0x30F6, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
	0x0397, 0x0398, 0x0399, 0x039A, 0x039B, 0x039C, 0x039D, 0x039E,
	0x039F, 0x03A0, 0x03A1, 0x03A3, 0x03A4, 0x03A5, 0x03A6, 0x03A7,
	0x03A8, 0x03A9, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6,
	0x03B7, 0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE,
	0x03BF, 0x03C0, 0x03C1, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
	0x03C8, 0x03C9, 0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415,
	0x0401, 0x0416, 0x0417, 0x0418, 0x0419, 0x041A, 0x041B, 0x041C,
	0x041D, 0x041E, 0x041F, 0x0420, 0x0421, 0x0422, 0x0423, 0x0424,
	0x0425, 0x0426, 0x0427, 0x0428, 0x0429, 0x042A, 0x042B, 0x042C,
	0x042D, 0x042E, 0x042F, 0x0430, 0x0431, 0x0432, 0x0433, 0x0434,
	0x0435, 0x0451, 0x0436, 0x0437, 0x0438, 0x0439, 0x043A, 0x043B,
	0x043C, 0x043D, 0x043E, 0x043F, 0x0440, 0x0441, 0x0442, 0x0443,
	0x0444, 0x0445, 0x0446, 0x0447, 0x0448, 0x0449, 0x044A, 0x044B,
	0x044C, 0x044D, 0x044E, 0x044F, 0x2500, 0x2502, 0x250C, 0x2510,
	0x2518, 0x2514, 0x251C, 0x252C, 0x2524, 0x2534, 0x253C, 0x2501,
	0x2503, 0x250F, 0x2513, 0x251B, 0x2517, 0x2523, 0x2533, 0x252B,
	0x253B, 0x254B, 0x2520, 0x252F, 0x2528, 0x2537, 0x253F, 0x251D,
	0x2530, 0x2525, 0x2538, 0x2542,

	// ASCII Section
	SEQUENCE_32(0x20),
	SEQUENCE_32(0x40),
	SEQUENCE_16(0x60),
	SEQUENCE_8(0x70),
	0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x203E,

	// Katakana Section
	0xFF61, 0xFF62, 0xFF63, 0xFF64, 0xFF65, 0xFF66, 0xFF67,
	SEQUENCE_8(0xFF68),
	SEQUENCE_16(0xFF70),
	SEQUENCE_32(0xFF80),
	0x30F0, 0x30F1, 0x30EE, 0xFF76, 0xFF79, 0xFF73, 0x30AB, 0x30AE,
	0x30B0, 0x30B2, 0x30B4, 0x3056, 0x3058, 0x305A, 0x305C, 0x305E,
	0x30C0, 0x30C2, 0x30C5, 0x30C7, 0x30C9, 0x30D0, 0x30D1, 0x30D3,
	0x30D4, 0x30D6, 0x30D7, 0x30D9, 0x30DA, 0x30DC, 0x30DD,

	0x2460, 0x2461, 0x2462, 0x2463, 0x2464, 0x2465, 0x2466, 0x2467,
	0x2468, 0x2469, 0x246A, 0x246B, 0x246C, 0x246D, 0x246E, 0x246F,
	0x2470, 0x2471, 0x2472, 0x2473, 0x2160, 0x2161, 0x2162, 0x2163,
	0x2164, 0x2165, 0x2166, 0x2167, 0x2168, 0x2169, 0x3349, 0x3314,
	0x3322, 0x334D, 0x3318, 0x3327, 0x3303, 0x3336, 0x3351, 0x3357,
	0x330D, 0x3326, 0x3323, 0x332B, 0x334A, 0x333B, 0x339C, 0x339D,
	0x339E, 0x338E, 0x338F, 0x33C4, 0x33A1, 0x337B, 0x301D, 0x301E,
	0x2116, 0x33CD, 0x2121, 0x32A4, 0x32A5, 0x32A6, 0x32A7, 0x32A8,
	0x3231, 0x3232, 0x3239, 0x337E, 0x337D, 0x337C, 0x2252, 0x2261,
	0x222B, 0x222E, 0x2211, 0x221A, 0x22A5, 0x2220, 0x221F, 0x22BF,
	0x2235, 0x2229, 0x222A, 0x4E9C, 0x5516, 0x5A03, 0x963F, 0x54C0,
	0x611B, 0x6328, 0x59F6, 0x9022, 0x8475, 0x831C, 0x7A50, 0x60AA,
	0x63E1, 0x6E25, 0x65ED, 0x8466, 0x82A6, 0x9BF5, 0x6893, 0x5727,
	0x65A1, 0x6271, 0x5B9B, 0x59D0, 0x867B, 0x98F4, 0x7D62, 0x7DBE,
	0x9B8E, 0x6216, 0x7C9F, 0x88B7, 0x5B89, 0x5EB5, 0x6309, 0x6697,
	0x6848, 0x95C7, 0x978D, 0x674F, 0x4EE5, 0x4F0A, 0x4F4D, 0x4F9D,
	0x5049, 0x56F2, 0x5937, 0x59D4, 0x5A01, 0x5C09, 0x60DF, 0x610F,
	0x6170, 0x6613, 0x6905, 0x70BA, 0x754F, 0x7570, 0x79FB, 0x7DAD,
	0x7DEF, 0x80C3, 0x840E, 0x8863, 0x8B02, 0x9055, 0x907A, 0x533B,
	0x4E95, 0x4EA5, 0x57DF, 0x80B2, 0x90C1, 0x78EF, 0x4E00, 0x58F1,
	0x6EA2, 0x9038, 0x7A32, 0x8328, 0x828B, 0x9C2F, 0x5141, 0x5370,
	0x54BD, 0x54E1, 0x56E0, 0x59FB, 0x5F15, 0x98F2, 0x6DEB, 0x80E4,
	0x852D, 0x9662, 0x9670, 0x96A0, 0x97FB, 0x540B, 0x53F3, 0x5B87,
	0x70CF, 0x7FBD, 0x8FC2, 0x96E8, 0x536F, 0x9D5C, 0x7ABA, 0x4E11,
	0x7893, 0x81FC, 0x6E26, 0x5618, 0x5504, 0x6B1D, 0x851A, 0x9C3B,
	0x59E5, 0x53A9, 0x6D66, 0x74DC, 0x958F, 0x5642, 0x4E91, 0x904B,
	0x96F2, 0x834F, 0x990C, 0x53E1, 0x55B6, 0x5B30, 0x5F71, 0x6620,
	0x66F3, 0x6804, 0x6C38, 0x6CF3, 0x6D29, 0x745B, 0x76C8, 0x7A4E,
	0x9834, 0x82F1, 0x885B, 0x8A60, 0x92ED, 0x6DB2, 0x75AB, 0x76CA,
	0x99C5, 0x60A6, 0x8B01, 0x8D8A, 0x95B2, 0x698E, 0x53AD, 0x5186,
	0x5712, 0x5830, 0x5944, 0x5BB4, 0x5EF6, 0x6028, 0x63A9, 0x63F4,
	0x6CBF, 0x6F14, 0x708E, 0x7114, 0x7159, 0x71D5, 0x733F, 0x7E01,
	0x8276, 0x82D1, 0x8597, 0x9060, 0x925B, 0x9D1B, 0x5869, 0x65BC,
	0x6C5A, 0x7525, 0x51F9, 0x592E, 0x5965, 0x5F80, 0x5FDC, 0x62BC,
	0x65FA, 0x6A2A, 0x6B27, 0x6BB4, 0x738B, 0x7FC1, 0x8956, 0x9D2C,
	0x9D0E, 0x9EC4, 0x5CA1, 0x6C96, 0x837B, 0x5104, 0x5C4B, 0x61B6,
	0x81C6, 0x6876, 0x7261, 0x4E59, 0x4FFA, 0x5378, 0x6069, 0x6E29,
	0x7A4F, 0x97F3, 0x4E0B, 0x5316, 0x4EEE, 0x4F55, 0x4F3D, 0x4FA1,
	0x4F73, 0x52A0, 0x53EF, 0x5609, 0x590F, 0x5AC1, 0x5BB6, 0x5BE1,
	0x79D1, 0x6687, 0x679C, 0x67B6, 0x6B4C, 0x6CB3, 0x706B, 0x73C2,
	0x798D, 0x79BE, 0x7A3C, 0x7B87, 0x82B1, 0x82DB, 0x8304, 0x8377,
	0x83EF, 0x83D3, 0x8766, 0x8AB2, 0x5629, 0x8CA8, 0x8FE6, 0x904E,
	0x971E, 0x868A, 0x4FC4, 0x5CE8, 0x6211, 0x7259, 0x753B, 0x81E5,
	0x82BD, 0x86FE, 0x8CC0, 0x96C5, 0x9913, 0x99D5, 0x4ECB, 0x4F1A,
	0x89E3, 0x56DE, 0x584A, 0x58CA, 0x5EFB, 0x5FEB, 0x602A, 0x6094,
	0x6062, 0x61D0, 0x6212, 0x62D0, 0x6539, 0x9B41, 0x6666, 0x68B0,
	0x6D77, 0x7070, 0x754C, 0x7686, 0x7D75, 0x82A5, 0x87F9, 0x958B,
	0x968E, 0x8C9D, 0x51F1, 0x52BE, 0x5916, 0x54B3, 0x5BB3, 0x5D16,
	0x6168, 0x6982, 0x6DAF, 0x788D, 0x84CB, 0x8857, 0x8A72, 0x93A7,
	0x9AB8, 0x6D6C, 0x99A8, 0x86D9, 0x57A3, 0x67FF, 0x86CE, 0x920E,
	0x5283, 0x5687, 0x5404, 0x5ED3, 0x62E1, 0x64B9, 0x683C, 0x6838,
	0x6BBB, 0x7372, 0x78BA, 0x7A6B, 0x899A, 0x89D2, 0x8D6B, 0x8F03,
	0x90ED, 0x95A3, 0x9694, 0x9769, 0x5B66, 0x5CB3, 0x697D, 0x984D,
	0x984E, 0x639B, 0x7B20, 0x6A2B, 0x6A7F, 0x68B6, 0x9C0D, 0x6F5F,
	0x5272, 0x559D, 0x6070, 0x62EC, 0x6D3B, 0x6E07, 0x6ED1, 0x845B,
	0x8910, 0x8F44, 0x4E14, 0x9C39, 0x53F6, 0x691B, 0x6A3A, 0x9784,
	0x682A, 0x515C, 0x7AC3, 0x84B2, 0x91DC, 0x938C, 0x565B, 0x9D28,
	0x6822, 0x8305, 0x8431, 0x7CA5, 0x5208, 0x82C5, 0x74E6, 0x4E7E,
	0x4F83, 0x51A0, 0x5BD2, 0x520A, 0x52D8, 0x52E7, 0x5DFB, 0x559A,
	0x582A, 0x59E6, 0x5B8C, 0x5B98, 0x5BDB, 0x5E72, 0x5E79, 0x60A3,
	0x611F, 0x6163, 0x61BE, 0x63DB, 0x6562, 0x67D1, 0x6853, 0x68FA,
	0x6B3E, 0x6B53, 0x6C57, 0x6F22, 0x6F97, 0x6F45, 0x74B0, 0x7518,
	0x76E3, 0x770B, 0x7AFF, 0x7BA1, 0x7C21, 0x7DE9, 0x7F36, 0x7FF0,
	0x809D, 0x8266, 0x839E, 0x89B3, 0x8ACC, 0x8CAB, 0x9084, 0x9451,
	0x9593, 0x9591, 0x95A2, 0x9665, 0x97D3, 0x9928, 0x8218, 0x4E38,
	0x542B, 0x5CB8, 0x5DCC, 0x73A9, 0x764C, 0x773C, 0x5CA9, 0x7FEB,
	0x8D0B, 0x96C1, 0x9811, 0x9854, 0x9858, 0x4F01, 0x4F0E, 0x5371,
	0x559C, 0x5668, 0x57FA, 0x5947, 0x5B09, 0x5BC4, 0x5C90, 0x5E0C,
	0x5E7E, 0x5FCC, 0x63EE, 0x673A, 0x65D7, 0x65E2, 0x671F, 0x68CB,
	0x68C4, 0x6A5F, 0x5E30, 0x6BC5, 0x6C17, 0x6C7D, 0x757F, 0x7948,
	0x5B63, 0x7A00, 0x7D00, 0x5FBD, 0x898F, 0x8A18, 0x8CB4, 0x8D77,
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	0x7AEF, 0x7BAA, 0x7DBB, 0x803D, 0x80C6, 0x86CB, 0x8A95, 0x935B,
	0x56E3, 0x58C7, 0x5F3E, 0x65AD, 0x6696, 0x6A80, 0x6BB5, 0x7537,
	0x8AC7, 0x5024, 0x77E5, 0x5730, 0x5F1B, 0x6065, 0x667A, 0x6C60,
	0x75F4, 0x7A1A, 0x7F6E, 0x81F4, 0x8718, 0x9045, 0x99B3, 0x7BC9,
	0x755C, 0x7AF9, 0x7B51, 0x84C4, 0x9010, 0x79E9, 0x7A92, 0x8336,
	0x5AE1, 0x7740, 0x4E2D, 0x4EF2, 0x5B99, 0x5FE0, 0x62BD, 0x663C,
	0x67F1, 0x6CE8, 0x866B, 0x8877, 0x8A3B, 0x914E, 0x92F3, 0x99D0,
	0x6A17, 0x7026, 0x732A, 0x82E7, 0x8457, 0x8CAF, 0x4E01, 0x5146,
	0x51CB, 0x558B, 0x5BF5, 0x5E16, 0x5E33, 0x5E81, 0x5F14, 0x5F35,
	0x5F6B, 0x5FB4, 0x61F2, 0x6311, 0x66A2, 0x671D, 0x6F6E, 0x7252,
	0x753A, 0x773A, 0x8074, 0x8139, 0x8178, 0x8776, 0x8ABF, 0x8ADC,
	0x8D85, 0x8DF3, 0x929A, 0x9577, 0x9802, 0x9CE5, 0x52C5, 0x6357,
	0x76F4, 0x6715, 0x6C88, 0x73CD, 0x8CC3, 0x93AE, 0x9673, 0x6D25,
	0x589C, 0x690E, 0x69CC, 0x8FFD, 0x939A, 0x75DB, 0x901A, 0x585A,
	0x6802, 0x63B4, 0x69FB, 0x4F43, 0x6F2C, 0x67D8, 0x8FBB, 0x8526,
	0x7DB4, 0x9354, 0x693F, 0x6F70, 0x576A, 0x58F7, 0x5B2C, 0x7D2C,
	0x722A, 0x540A, 0x91E3, 0x9DB4, 0x4EAD, 0x4F4E, 0x505C, 0x5075,
	0x5243, 0x8C9E, 0x5448, 0x5824, 0x5B9A, 0x5E1D, 0x5E95, 0x5EAD,
	0x5EF7, 0x5F1F, 0x608C, 0x62B5, 0x633A, 0x63D0, 0x68AF, 0x6C40,
	0x7887, 0x798E, 0x7A0B, 0x7DE0, 0x8247, 0x8A02, 0x8AE6, 0x8E44,
	0x9013, 0x90B8, 0x912D, 0x91D8, 0x9F0E, 0x6CE5, 0x6458, 0x64E2,
	0x6575, 0x6EF4, 0x7684, 0x7B1B, 0x9069, 0x93D1, 0x6EBA, 0x54F2,
	0x5FB9, 0x64A4, 0x8F4D, 0x8FED, 0x9244, 0x5178, 0x586B, 0x5929,
	0x5C55, 0x5E97, 0x6DFB, 0x7E8F, 0x751C, 0x8CBC, 0x8EE2, 0x985B,
	0x70B9, 0x4F1D, 0x6BBF, 0x6FB1, 0x7530, 0x96FB, 0x514E, 0x5410,
	0x5835, 0x5857, 0x59AC, 0x5C60, 0x5F92, 0x6597, 0x675C, 0x6E21,
	0x767B, 0x83DF, 0x8CED, 0x9014, 0x90FD, 0x934D, 0x7825, 0x783A,
	0x52AA, 0x5EA6, 0x571F, 0x5974, 0x6012, 0x5012, 0x515A, 0x51AC,
	0x51CD, 0x5200, 0x5510, 0x5854, 0x5858, 0x5957, 0x5B95, 0x5CF6,
	0x5D8B, 0x60BC, 0x6295, 0x642D, 0x6771, 0x6843, 0x68BC, 0x68DF,
	0x76D7, 0x6DD8, 0x6E6F, 0x6D9B, 0x706F, 0x71C8, 0x5F53, 0x75D8,
	0x7977, 0x7B49, 0x7B54, 0x7B52, 0x7CD6, 0x7D71, 0x5230, 0x8463,
	0x8569, 0x85E4, 0x8A0E, 0x8B04, 0x8C46, 0x8E0F, 0x9003, 0x900F,
	0x9419, 0x9676, 0x982D, 0x9A30, 0x95D8, 0x50CD, 0x52D5, 0x540C,
	0x5802, 0x5C0E, 0x61A7, 0x649E, 0x6D1E, 0x77B3, 0x7AE5, 0x80F4,
	0x8404, 0x9053, 0x9285, 0x5CE0, 0x9D07, 0x533F, 0x5F97, 0x5FB3,
	0x6D9C, 0x7279, 0x7763, 0x79BF, 0x7BE4, 0x6BD2, 0x72EC, 0x8AAD,
	0x6803, 0x6A61, 0x51F8, 0x7A81, 0x6934, 0x5C4A, 0x9CF6, 0x82EB,
	0x5BC5, 0x9149, 0x701E, 0x5678, 0x5C6F, 0x60C7, 0x6566, 0x6C8C,
	0x8C5A, 0x9041, 0x9813, 0x5451, 0x66C7, 0x920D, 0x5948, 0x90A3,
	0x5185, 0x4E4D, 0x51EA, 0x8599, 0x8B0E, 0x7058, 0x637A, 0x934B,
	0x6962, 0x99B4, 0x7E04, 0x7577, 0x5357, 0x6960, 0x8EDF, 0x96E3,
	0x6C5D, 0x4E8C, 0x5C3C, 0x5F10, 0x8FE9, 0x5302, 0x8CD1, 0x8089,
	0x8679, 0x5EFF, 0x65E5, 0x4E73, 0x5165, 0x5982, 0x5C3F, 0x97EE,
	0x4EFB, 0x598A, 0x5FCD, 0x8A8D, 0x6FE1, 0x79B0, 0x7962, 0x5BE7,
	0x8471, 0x732B, 0x71B1, 0x5E74, 0x5FF5, 0x637B, 0x649A, 0x71C3,
	0x7C98, 0x4E43, 0x5EFC, 0x4E4B, 0x57DC, 0x56A2, 0x60A9, 0x6FC3,
	0x7D0D, 0x80FD, 0x8133, 0x81BF, 0x8FB2, 0x8997, 0x86A4, 0x5DF4,
	0x628A, 0x64AD, 0x8987, 0x6777, 0x6CE2, 0x6D3E, 0x7436, 0x7834,
	0x5A46, 0x7F75, 0x82AD, 0x99AC, 0x4FF3, 0x5EC3, 0x62DD, 0x6392,
	0x6557, 0x676F, 0x76C3, 0x724C, 0x80CC, 0x80BA, 0x8F29, 0x914D,
	0x500D, 0x57F9, 0x5A92, 0x6885, 0x6973, 0x7164, 0x72FD, 0x8CB7,
	0x58F2, 0x8CE0, 0x966A, 0x9019, 0x877F, 0x79E4, 0x77E7, 0x8429,
	0x4F2F, 0x5265, 0x535A, 0x62CD, 0x67CF, 0x6CCA, 0x767D, 0x7B94,
	0x7C95, 0x8236, 0x8584, 0x8FEB, 0x66DD, 0x6F20, 0x7206, 0x7E1B,
	0x83AB, 0x99C1, 0x9EA6, 0x51FD, 0x7BB1, 0x7872, 0x7BB8, 0x8087,
	0x7B48, 0x6AE8, 0x5E61, 0x808C, 0x7551, 0x7560, 0x516B, 0x9262,
	0x6E8C, 0x767A, 0x9197, 0x9AEA, 0x4F10, 0x7F70, 0x629C, 0x7B4F,
	0x95A5, 0x9CE9, 0x567A, 0x5859, 0x86E4, 0x96BC, 0x4F34, 0x5224,
	0x534A, 0x53CD, 0x53DB, 0x5E06, 0x642C, 0x6591, 0x677F, 0x6C3E,
	0x6C4E, 0x7248, 0x72AF, 0x73ED, 0x7554, 0x7E41, 0x822C, 0x85E9,
	0x8CA9, 0x7BC4, 0x91C6, 0x7169, 0x9812, 0x98EF, 0x633D, 0x6669,
	0x756A, 0x76E4, 0x78D0, 0x8543, 0x86EE, 0x532A, 0x5351, 0x5426,
	0x5983, 0x5E87, 0x5F7C, 0x60B2, 0x6249, 0x6279, 0x62AB, 0x6590,
	0x6BD4, 0x6CCC, 0x75B2, 0x76AE, 0x7891, 0x79D8, 0x7DCB, 0x7F77,
	0x80A5, 0x88AB, 0x8AB9, 0x8CBB, 0x907F, 0x975E, 0x98DB, 0x6A0B,
	0x7C38, 0x5099, 0x5C3E, 0x5FAE, 0x6787, 0x6BD8, 0x7435, 0x7709,
	0x7F8E, 0x9F3B, 0x67CA, 0x7A17, 0x5339, 0x758B, 0x9AED, 0x5F66,
	0x819D, 0x83F1, 0x8098, 0x5F3C, 0x5FC5, 0x7562, 0x7B46, 0x903C,
	0x6867, 0x59EB, 0x5A9B, 0x7D10, 0x767E, 0x8B2C, 0x4FF5, 0x5F6A,
	0x6A19, 0x6C37, 0x6F02, 0x74E2, 0x7968, 0x8868, 0x8A55, 0x8C79,
	0x5EDF, 0x63CF, 0x75C5, 0x79D2, 0x82D7, 0x9328, 0x92F2, 0x849C,
	0x86ED, 0x9C2D, 0x54C1, 0x5F6C, 0x658C, 0x6D5C, 0x7015, 0x8CA7,
	0x8CD3, 0x983B, 0x654F, 0x74F6, 0x4E0D, 0x4ED8, 0x57E0, 0x592B,
	0x5A66, 0x5BCC, 0x51A8, 0x5E03, 0x5E9C, 0x6016, 0x6276, 0x6577,
	0x65A7, 0x666E, 0x6D6E, 0x7236, 0x7B26, 0x8150, 0x819A, 0x8299,
	0x8B5C, 0x8CA0, 0x8CE6, 0x8D74, 0x961C, 0x9644, 0x4FAE, 0x64AB,
	0x6B66, 0x821E, 0x8461, 0x856A, 0x90E8, 0x5C01, 0x6953, 0x98A8,
	0x847A, 0x8557, 0x4F0F, 0x526F, 0x5FA9, 0x5E45, 0x670D, 0x798F,
	0x8179, 0x8907, 0x8986, 0x6DF5, 0x5F17, 0x6255, 0x6CB8, 0x4ECF,
	0x7269, 0x9B92, 0x5206, 0x543B, 0x5674, 0x58B3, 0x61A4, 0x626E,
	0x711A, 0x596E, 0x7C89, 0x7CDE, 0x7D1B, 0x96F0, 0x6587, 0x805E,
	0x4E19, 0x4F75, 0x5175, 0x5840, 0x5E63, 0x5E73, 0x5F0A, 0x67C4,
	0x4E26, 0x853D, 0x9589, 0x965B, 0x7C73, 0x9801, 0x50FB, 0x58C1,
	0x7656, 0x78A7, 0x5225, 0x77A5, 0x8511, 0x7B86, 0x504F, 0x5909,
	0x7247, 0x7BC7, 0x7DE8, 0x8FBA, 0x8FD4, 0x904D, 0x4FBF, 0x52C9,
	0x5A29, 0x5F01, 0x97AD, 0x4FDD, 0x8217, 0x92EA, 0x5703, 0x6355,
	0x6B69, 0x752B, 0x88DC, 0x8F14, 0x7A42, 0x52DF, 0x5893, 0x6155,
	0x620A, 0x66AE, 0x6BCD, 0x7C3F, 0x83E9, 0x5023, 0x4FF8, 0x5305,
	0x5446, 0x5831, 0x5949, 0x5B9D, 0x5CF0, 0x5CEF, 0x5D29, 0x5E96,
	0x62B1, 0x6367, 0x653E, 0x65B9, 0x670B, 0x6CD5, 0x6CE1, 0x70F9,
	0x7832, 0x7E2B, 0x80DE, 0x82B3, 0x840C, 0x84EC, 0x8702, 0x8912,
	0x8A2A, 0x8C4A, 0x90A6, 0x92D2, 0x98FD, 0x9CF3, 0x9D6C, 0x4E4F,
	0x4EA1, 0x508D, 0x5256, 0x574A, 0x59A8, 0x5E3D, 0x5FD8, 0x5FD9,
	0x623F, 0x66B4, 0x671B, 0x67D0, 0x68D2, 0x5192, 0x7D21, 0x80AA,
	0x81A8, 0x8B00, 0x8C8C, 0x8CBF, 0x927E, 0x9632, 0x5420, 0x982C,
	0x5317, 0x50D5, 0x535C, 0x58A8, 0x64B2, 0x6734, 0x7267, 0x7766,
	0x7A46, 0x91E6, 0x52C3, 0x6CA1, 0x6B86, 0x5800, 0x5E4C, 0x5954,
	0x672C, 0x7FFB, 0x51E1, 0x76C6, 0x6469, 0x78E8, 0x9B54, 0x9EBB,
	0x57CB, 0x59B9, 0x6627, 0x679A, 0x6BCE, 0x54E9, 0x69D9, 0x5E55,
	0x819C, 0x6795, 0x9BAA, 0x67FE, 0x9C52, 0x685D, 0x4EA6, 0x4FE3,
	0x53C8, 0x62B9, 0x672B, 0x6CAB, 0x8FC4, 0x4FAD, 0x7E6D, 0x9EBF,
	0x4E07, 0x6162, 0x6E80, 0x6F2B, 0x8513, 0x5473, 0x672A, 0x9B45,
	0x5DF3, 0x7B95, 0x5CAC, 0x5BC6, 0x871C, 0x6E4A, 0x84D1, 0x7A14,
	0x8108, 0x5999, 0x7C8D, 0x6C11, 0x7720, 0x52D9, 0x5922, 0x7121,
	0x725F, 0x77DB, 0x9727, 0x9D61, 0x690B, 0x5A7F, 0x5A18, 0x51A5,
	0x540D, 0x547D, 0x660E, 0x76DF, 0x8FF7, 0x9298, 0x9CF4, 0x59EA,
	0x725D, 0x6EC5, 0x514D, 0x68C9, 0x7DBF, 0x7DEC, 0x9762, 0x9EBA,
	0x6478, 0x6A21, 0x8302, 0x5984, 0x5B5F, 0x6BDB, 0x731B, 0x76F2,
	0x7DB2, 0x8017, 0x8499, 0x5132, 0x6728, 0x9ED9, 0x76EE, 0x6762,
	0x52FF, 0x9905, 0x5C24, 0x623B, 0x7C7E, 0x8CB0, 0x554F, 0x60B6,
	0x7D0B, 0x9580, 0x5301, 0x4E5F, 0x51B6, 0x591C, 0x723A, 0x8036,
	0x91CE, 0x5F25, 0x77E2, 0x5384, 0x5F79, 0x7D04, 0x85AC, 0x8A33,
	0x8E8D, 0x9756, 0x67F3, 0x85AE, 0x9453, 0x6109, 0x6108, 0x6CB9,
	0x7652, 0x8AED, 0x8F38, 0x552F, 0x4F51, 0x512A, 0x52C7, 0x53CB,
	0x5BA5, 0x5E7D, 0x60A0, 0x6182, 0x63D6, 0x6709, 0x67DA, 0x6E67,
	0x6D8C, 0x7336, 0x7337, 0x7531, 0x7950, 0x88D5, 0x8A98, 0x904A,
	0x9091, 0x90F5, 0x96C4, 0x878D, 0x5915, 0x4E88, 0x4F59, 0x4E0E,
	0x8A89, 0x8F3F, 0x9810, 0x50AD, 0x5E7C, 0x5996, 0x5BB9, 0x5EB8,
	0x63DA, 0x63FA, 0x64C1, 0x66DC, 0x694A, 0x69D8, 0x6D0B, 0x6EB6,
	0x7194, 0x7528, 0x7AAF, 0x7F8A, 0x8000, 0x8449, 0x84C9, 0x8981,
	0x8B21, 0x8E0A, 0x9065, 0x967D, 0x990A, 0x617E, 0x6291, 0x6B32,
	0x6C83, 0x6D74, 0x7FCC, 0x7FFC, 0x6DC0, 0x7F85, 0x87BA, 0x88F8,
	0x6765, 0x83B1, 0x983C, 0x96F7, 0x6D1B, 0x7D61, 0x843D, 0x916A,
	0x4E71, 0x5375, 0x5D50, 0x6B04, 0x6FEB, 0x85CD, 0x862D, 0x89A7,
	0x5229, 0x540F, 0x5C65, 0x674E, 0x68A8, 0x7406, 0x7483, 0x75E2,
	0x88CF, 0x88E1, 0x91CC, 0x96E2, 0x9678, 0x5F8B, 0x7387, 0x7ACB,
	0x844E, 0x63A0, 0x7565, 0x5289, 0x6D41, 0x6E9C, 0x7409, 0x7559,
	0x786B, 0x7C92, 0x9686, 0x7ADC, 0x9F8D, 0x4FB6, 0x616E, 0x65C5,
	0x865C, 0x4E86, 0x4EAE, 0x50DA, 0x4E21, 0x51CC, 0x5BEE, 0x6599,
	0x6881, 0x6DBC, 0x731F, 0x7642, 0x77AD, 0x7A1C, 0x7CE7, 0x826F,
	0x8AD2, 0x907C, 0x91CF, 0x9675, 0x9818, 0x529B, 0x7DD1, 0x502B,
	0x5398, 0x6797, 0x6DCB, 0x71D0, 0x7433, 0x81E8, 0x8F2A, 0x96A3,
	0x9C57, 0x9E9F, 0x7460, 0x5841, 0x6D99, 0x7D2F, 0x985E, 0x4EE4,
	0x4F36, 0x4F8B, 0x51B7, 0x52B1, 0x5DBA, 0x601C, 0x73B2, 0x793C,
	0x82D3, 0x9234, 0x96B7, 0x96F6, 0x970A, 0x9E97, 0x9F62, 0x66A6,
	0x6B74, 0x5217, 0x52A3, 0x70C8, 0x88C2, 0x5EC9, 0x604B, 0x6190,
	0x6F23, 0x7149, 0x7C3E, 0x7DF4, 0x806F, 0x84EE, 0x9023, 0x932C,
	0x5442, 0x9B6F, 0x6AD3, 0x7089, 0x8CC2, 0x8DEF, 0x9732, 0x52B4,
	0x5A41, 0x5ECA, 0x5F04, 0x6717, 0x697C, 0x6994, 0x6D6A, 0x6F0F,
	0x7262, 0x72FC, 0x7BED, 0x8001, 0x807E, 0x874B, 0x90CE, 0x516D,
	0x9E93, 0x7984, 0x808B, 0x9332, 0x8AD6, 0x502D, 0x548C, 0x8A71,
	0x6B6A, 0x8CC4, 0x8107, 0x60D1, 0x67A0, 0x9DF2, 0x4E99, 0x4E98,
	0x9C10, 0x8A6B, 0x85C1, 0x8568, 0x6900, 0x6E7E, 0x7897, 0x8155,

	// Padding to ensure size is 4-byte aligned
	0, 0, 0,
};

// Font conversion error
class font_error : public std::runtime_error
{
public:
	explicit font_error(const char* msg) : std::runtime_error(msg) {}
};

// Error decompressing a yay0 file
class yay0_error : public std::runtime_error
{
public:
	explicit yay0_error(const char* msg) : std::runtime_error(msg) {}
};

// Class which writes bits to the mask vector
class mask_vector_writer
{
public:
	void push_back(bool bit)
	{
		// Increase array size if needed
		if (_next_offset < 0)
		{
			_data.push_back(0);
			_next_offset = 7;
		}

		// Insert bit
		_data.back() |= (bit << _next_offset);
		_next_offset--;
	}

	const std::vector<uint8_t>& data() const
	{
		return _data;
	}

private:
	std::vector<uint8_t> _data;
	int8_t _next_offset = -1;
};

// Class which reads bits from the mask vector
class mask_vector_reader
{
public:
	mask_vector_reader(const std::vector<uint8_t>& input, size_t offset)
		:_input(input), _offset(offset)
	{
	}

	bool pop_front()
	{
		// Read next byte if needed
		if (_next_bit == 8)
		{
			_next_bit = 0;
			_offset++;
		}

		bool value = (_input.at(_offset) << _next_bit) & 0x80;
		_next_bit++;
		return value;
	}

private:
	const std::vector<uint8_t>& _input;
	size_t _offset;
	uint8_t _next_bit = 0;
};

// Simple image container containing height and width
template <int height_scale>
class image_generic
{
public:
	std::vector<uint8_t> data;
	unsigned width;

	image_generic() = default;
	image_generic(const std::vector<uint8_t>& idata, unsigned iwidth)
		:data(idata), width(iwidth)
	{
	}

	unsigned height() const
	{
		return height_scale * data.size() / width;
	}
};

typedef image_generic<1> image8;
typedef image_generic<4> image2;

// Wraps a freetype library object + destroys it when done
class ft_library_wrapper
{
public:
	ft_library_wrapper()
	{
		if (FT_Init_FreeType(&_library) != 0)
			throw font_error("error initializing freetype");
	}

	ft_library_wrapper(const ft_library_wrapper&) = delete;
	ft_library_wrapper operator=(const ft_library_wrapper&) = delete;

	~ft_library_wrapper()
	{
		FT_Done_FreeType(_library);
	}

	operator FT_Library()
	{
		return _library;
	}

private:
	FT_Library _library;
};

// Reads a 16 bit big endian value from a vector
static uint16_t read_be16(const std::vector<uint8_t>& input, size_t offset)
{
	return input.at(offset) << 8 |
	       input.at(offset + 1);
}

// Reads a 32 bit big endian value from a vector
static uint32_t read_be32(const std::vector<uint8_t>& input, size_t offset)
{
	return read_be16(input, offset) << 16 |
	       read_be16(input, offset + 2);
}

// Writes a 16 bit big endian value to a vector
static void write_be16(std::vector<uint8_t>& output, uint16_t value)
{
	output.push_back(static_cast<uint8_t>(value >> 8));
	output.push_back(static_cast<uint8_t>(value));
}

// Writes a 32 bit big endian value to a vector
static void write_be32(std::vector<uint8_t>& output, uint32_t value)
{
	write_be16(output, static_cast<uint16_t>(value >> 16));
	write_be16(output, static_cast<uint16_t>(value));
}

// Writes a 16 bit little endian value to a vector
static void write_le16(std::vector<uint8_t>& output, uint16_t value)
{
	output.push_back(static_cast<uint8_t>(value));
	output.push_back(static_cast<uint8_t>(value >> 8));
}

// Writes a 16 bit little endian value to a vector
static void write_le32(std::vector<uint8_t>& output, uint32_t value)
{
	write_le16(output, static_cast<uint16_t>(value));
	write_le16(output, static_cast<uint16_t>(value >> 16));
}

// Clamps an integer between two values
static int clamp(int value, int min, int max)
{
	if (value < min)
		value = min;
	else if (value > max)
		value = max;

	return value;
}

// Compresses a file using the Yay0 format
static std::vector<uint8_t> yay0_compress(const std::vector<uint8_t>& input)
{
	const uint16_t MAX_LINK_LEN = 255 + 18;

	size_t input_pos = 0;
	mask_vector_writer masks;
	std::vector<uint8_t> links;
	std::vector<uint8_t> chunks;

	// Start the main loop to generate a single link or chunk
	while (input_pos < input.size())
	{
		uint16_t link_count = 0;
		uint16_t link_offset;

		// Search the previous 4K for the largest series of bytes to use as a link
		for (uint16_t offset = 1; offset <= 0x1000 && offset <= input_pos; offset++)
		{
			uint16_t count = 0;
			bool max_count_reached = false;

			while (input[input_pos - offset + count] == input[input_pos + count])
			{
				count++;

				// Limit the number of characters
				if (count > MAX_LINK_LEN || input_pos + count >= input.size())
				{
					max_count_reached = true;
					break;
				}
			}

			// Handle max link lengths
			if (max_count_reached)
			{
				link_count = count - 1;
				link_offset = offset;
				break;
			}

			// Update best link
			if (count > link_count)
			{
				link_count = count;
				link_offset = offset;
			}
		}

		// Write link or chunk to relevant list
		if (link_count >= 3)
		{
			uint16_t link_count_header = 0;

			if (link_count >= 18)
				chunks.push_back(link_count - 18);
			else
				link_count_header = link_count - 2;

			write_be16(links, link_count_header << 12 | (link_offset - 1));
			masks.push_back(false);
			input_pos += link_count;
		}
		else
		{
			chunks.push_back(input[input_pos]);
			masks.push_back(true);
			input_pos++;
		}
	}

	// Return final array
	std::vector<uint8_t> result = { 'Y', 'a', 'y', '0' };
	write_be32(result, input.size());
	write_be32(result, 16 + masks.data().size());
	write_be32(result, 16 + masks.data().size() + links.size());

	result.insert(result.end(), masks.data().begin(), masks.data().end());
	result.insert(result.end(), links.begin(), links.end());
	result.insert(result.end(), chunks.begin(), chunks.end());
	return result;
}

// Decompresses a file using the Yay0 format
static std::vector<uint8_t> yay0_decompress(const std::vector<uint8_t>& input)
{
	std::vector<uint8_t> result;

	try
	{
		// Validate header
		if (input.at(0) != 'Y' || input.at(1) != 'a' ||
			input.at(2) != 'y' || input.at(3) != '0')
		{
			throw yay0_error("yay0: not a yay0 file");
		}

		// Extract header information
		uint32_t final_size = read_be32(input, 4);
		uint32_t links_offset = read_be32(input, 8);
		uint32_t chunks_offset = read_be32(input, 12);
		mask_vector_reader masks(input, 16);

		result.reserve(final_size);

		while (result.size() < final_size)
		{
			// Link or a chunk?
			if (masks.pop_front())
			{
				// Write chunk to output
				result.push_back(input.at(chunks_offset));
				chunks_offset++;
			}
			else
			{
				// Examine link contents
				uint16_t link = read_be16(input, links_offset);
				links_offset += 2;

				int count = (link >> 12) + 2;
				if (count == 2)
				{
					// Read count from chunks list
					count = input.at(chunks_offset) + 18;
					chunks_offset++;
				}

				// Replay the link
				unsigned offset = ((link & 0xFFF) + 1);
				if (offset > result.size())
					throw yay0_error("yay0: invalid yay0 file");

				for (int i = 0; i < count; i++)
					result.push_back(result.at(result.size() - offset));
			}
		}

		return result;
	}
	catch (std::out_of_range)
	{
		// Invalid offset somewhere
		throw yay0_error("yay0: invalid yay0 file");
	}
}

// Encodes an 8 bit greyscale bitmap as an i2 font image
static image2 i2encode(const image8& image)
{
	image2 out;

	const std::vector<uint8_t>& data = image.data;
	unsigned width = image.width;

	// Blocks are 8x8 pixels
	//  Each row is 2 bytes wide, 16 bytes per block
	unsigned width_blocks = width / 8;
	unsigned height_blocks = data.size() / (width_blocks * 64);

	out.data.resize(height_blocks * width_blocks * 16);
	out.width = width_blocks * 8;

	// Process each row of blocks, and then each block in the row
	for (unsigned block_row = 0; block_row < height_blocks; block_row++)
	{
		for (unsigned block = 0; block < width_blocks; block++)
		{
			for (unsigned row = 0; row < 8; row++)
			{
				// Move pixel data to the right place and shrink 8-bit data to 2-bit
				unsigned src_row_offset = (block_row * width_blocks * 64) +
				                          (block * 8) + (row * width_blocks * 8);
				unsigned dst_row_offset = (block_row * width_blocks * 16) +
				                          (block * 16) + (row * 2);

				out.data[dst_row_offset    ] =
					(data[src_row_offset    ]      & 0xC0) |
					(data[src_row_offset + 1] >> 2 & 0x30) |
					(data[src_row_offset + 2] >> 4 & 0x0C) |
					(data[src_row_offset + 3] >> 6       );
				out.data[dst_row_offset + 1] =
					(data[src_row_offset + 4]      & 0xC0) |
					(data[src_row_offset + 5] >> 2 & 0x30) |
					(data[src_row_offset + 6] >> 4 & 0x0C) |
					(data[src_row_offset + 7] >> 6       );
			}
		}
	}

	return out;
}

// Decodes an i2 image into a normal 8-bit greyscale bitmap
static image8 i2decode(const image2& image)
{
	image8 out;

	const std::vector<uint8_t>& data = image.data;
	unsigned width = image.width;

	// Blocks are 8x8 pixels
	//  Each row is 2 bytes wide, 16 bytes per block
	unsigned width_blocks = (width + 7) / 8;
	unsigned height_blocks = data.size() / (width_blocks * 16);

	out.data.resize(height_blocks * width_blocks * 64);
	out.width = width_blocks * 8;

	// Process each row of blocks, and then each block in the row
	for (unsigned block_row = 0; block_row < height_blocks; block_row++)
	{
		for (unsigned block = 0; block < width_blocks; block++)
		{
			for (unsigned row = 0; row < 8; row++)
			{
				// Move pixel data to the right place and expand 2-bit data to 8-bit
				unsigned src_row_offset = (block_row * width_blocks * 16) +
				                          (block * 16) + (row * 2);
				unsigned dst_row_offset = (block_row * width_blocks * 64) +
				                          (block * 8) + (row * width_blocks * 8);

				uint8_t src1 = data[src_row_offset];
				uint8_t src2 = data[src_row_offset + 1];

				out.data[dst_row_offset    ] = (src1 >> 6       ) * 0x55;
				out.data[dst_row_offset + 1] = (src1 >> 4 & 0x03) * 0x55;
				out.data[dst_row_offset + 2] = (src1 >> 2 & 0x03) * 0x55;
				out.data[dst_row_offset + 3] = (src1      & 0x03) * 0x55;

				out.data[dst_row_offset + 4] = (src2 >> 6       ) * 0x55;
				out.data[dst_row_offset + 5] = (src2 >> 4 & 0x03) * 0x55;
				out.data[dst_row_offset + 6] = (src2 >> 2 & 0x03) * 0x55;
				out.data[dst_row_offset + 7] = (src2      & 0x03) * 0x55;
			}
		}
	}

	return out;
}

// Adds an error to the given pixel while clamping it
static void dither_add_clamp(uint8_t& pixel, int error)
{
	if (pixel + error < 0)
		pixel = 0;
	else if (pixel + error > 255)
		pixel = 255;
	else
		pixel += error;
}

// Dithers the given image (in-place) using the Floyd–Steinberg dithering algorithm
static void dither_4colour(image8& image)
{
	const unsigned height = image.height();

	for (unsigned y = 0; y < height; y++)
	{
		for (unsigned x = 0; x < image.width; x++)
		{
			uint8_t old_pixel = image.data[y * image.width + x];
			uint8_t new_pixel = old_pixel & 0xC0;
			int error = old_pixel - new_pixel;

			// Store new pixel value + distribute error to surrounding pixels
			image.data[y * image.width + x] = new_pixel;

			if (x + 1 < image.width)
				dither_add_clamp(image.data[y * image.width + x + 1], error * 7 / 16);

			if (y + 1 < height)
			{
				dither_add_clamp(image.data[(y + 1) * image.width + x], error * 5 / 16);
				if (x > 0)
					dither_add_clamp(image.data[(y + 1) * image.width + x - 1], error * 3 / 16);
				if (x + 1 < image.width)
					dither_add_clamp(image.data[(y + 1) * image.width + x + 1], error / 16);
			}
		}
	}
}

// Creates the bmp header from an image
static std::vector<uint8_t> generate_bmp_header(const image8& img)
{
	const unsigned HEADER_SIZE = 14 + 40 + (4 * 256);
	std::vector<uint8_t> result;

	// BMP Header
	result.push_back('B');
	result.push_back('M');
	write_le32(result, HEADER_SIZE + img.data.size());
	write_le32(result, 0);
	write_le32(result, HEADER_SIZE);

	// DIB Header
	write_le32(result, 40);                 // Size of header
	write_le32(result, img.width);          // Image width
	write_le32(result, ~img.height() + 1);  // Image height (stored negative)
	write_le16(result, 1);                  // Image planes
	write_le16(result, 8);                  // Bits per pixel
	write_le32(result, 0);                  // Compression type
	write_le32(result, 0);                  // Size of image in bytes
	write_le32(result, 0);                  // X Pixels per metre
	write_le32(result, 0);                  // Y Pixels per metre
	write_le32(result, 0);                  // Colour table size
	write_le32(result, 0);                  // Colour table required

	// Colour table (RGBA)
	for (unsigned i = 0; i < 256; i++)
		write_be32(result, 0x01010100 * i);

	return result;
}

// Converts a Yay0 font to a bitmap
static std::vector<uint8_t> fnt_to_bmp(const std::vector<uint8_t>& input)
{
	std::vector<uint8_t> uncompressed_fnt = yay0_decompress(input);

	// Descramble image
	uint32_t start = read_be32(uncompressed_fnt, 0x24);
	image2 i2data;
	i2data.width = read_be16(uncompressed_fnt, 0x1E);
	i2data.data.assign(uncompressed_fnt.begin() + start, uncompressed_fnt.end());

	image8 dest = i2decode(i2data);

	// Write bitmap out
	std::vector<uint8_t> bitmap = generate_bmp_header(dest);
	bitmap.insert(bitmap.end(), dest.data.begin(), dest.data.end());

	return bitmap;
}

// Generates a GameCube font file
static std::vector<uint8_t> generate_fnt(
	font_type type,
	const std::vector<uint8_t>& widths,
	const image2& pixmap)
{
	std::vector<uint8_t> out;

	write_be16(out, type == font_type::windows_1252 ? 0 : 2);
	write_be16(out, type == font_type::windows_1252 ? 0x0020 : 0x8140);
	write_be16(out, type == font_type::windows_1252 ? 0x00FF : 0x9872);
	write_be16(out, 0x20);
	write_be16(out, FNT_CELL_SIZE);
	write_be16(out, 0x00);
	write_be16(out, FNT_CELL_SIZE);
	write_be16(out, FNT_CELL_SIZE * 7 / 6);
	write_be16(out, FNT_CELL_SIZE);
	write_be16(out, FNT_CELL_SIZE);
	write_be32(out, FNT_PIXMAP_WIDTH * FNT_PIXMAP_WIDTH / 2);
	write_be16(out, 0x00);
	write_be16(out, FNT_CELLS_PER_ROW);
	write_be16(out, FNT_CELLS_PER_ROW);
	write_be16(out, FNT_PIXMAP_WIDTH);
	write_be16(out, FNT_PIXMAP_WIDTH);
	write_be16(out, 0x30);
	write_be32(out, 0x30 + widths.size());
	write_be32(out, 2 * pixmap.data.size());
	write_be32(out, 0x0055AAFF);

	out.insert(out.end(), widths.begin(), widths.end());
	out.insert(out.end(), pixmap.data.begin(), pixmap.data.end());
	return out;
}

// Generates the font data arrays from a freetype font
//  font_buf = input font data
//  font_table = list of unicode codepoints appearing in the font
//  font_table_size = number of characters in font_table
//  out_widths = output vector to store advance widths of each character
//  out_pixmap = output vector to store pixmap (unscrambled)
static void freetype_to_fnt_data(
	const std::vector<uint8_t>& font_buf,
	const uint16_t* font_table,
	unsigned font_table_size,
	std::vector<uint8_t>& out_widths,
	image8& out_pixmap)
{
	// Initialize freetype
	ft_library_wrapper library;

	// Initialize fontface
	FT_Face face;
	if (FT_New_Memory_Face(library, font_buf.data(), font_buf.size(), 0, &face) != 0)
		throw font_error("error reading font data");

	// Set size to render glyphs at
	if (FT_Set_Pixel_Sizes(face, 0, FNT_RENDER_SIZE) != 0)
		throw font_error("error selecting font size (is the font scalable?)");

	// Get descender size in pixels (negative value)
	const int descender = face->size->metrics.descender >> 6;

	// Resize output vectors
	const unsigned cpr_squared = FNT_CELLS_PER_ROW * FNT_CELLS_PER_ROW;
	const unsigned pages = (font_table_size + cpr_squared - 1) / cpr_squared;

	out_widths.clear();
	out_widths.resize(font_table_size);
	out_pixmap.data.clear();
	out_pixmap.data.resize(FNT_PIXMAP_WIDTH * FNT_PIXMAP_WIDTH * pages);
	out_pixmap.width = FNT_PIXMAP_WIDTH;

	// Render each glyph in the list
	for (unsigned i = 0; i < font_table_size; i++)
	{
		unsigned glyph_index = FT_Get_Char_Index(face, font_table[i]);

		// Skip undefined characters
		if (glyph_index == 0)
			continue;

		// Load glyph data
		if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER) != 0)
			throw font_error("error loading glyph");

		// Record width
		out_widths[i] = clamp(face->glyph->metrics.horiAdvance >> 6, 0, FNT_CELL_SIZE);

		// Calculate cell offset within final image
		const unsigned cell_page = i / cpr_squared;
		const unsigned cell_y = (i % cpr_squared) / FNT_CELLS_PER_ROW;
		const unsigned cell_x = (i % cpr_squared) % FNT_CELLS_PER_ROW;
		const int cell_offset =
			cell_page * FNT_PIXMAP_WIDTH * FNT_PIXMAP_WIDTH +
			cell_y    * FNT_PIXMAP_WIDTH * FNT_CELL_SIZE +
			cell_x    * FNT_CELL_SIZE;

		// Copy glyph image
		const FT_Bitmap* bitmap = &face->glyph->bitmap;
		const int xStart = face->glyph->bitmap_left;
		const int yStart = FNT_CELL_SIZE + descender - face->glyph->bitmap_top;
		const int xMax = xStart + bitmap->width;
		const int yMax = yStart + bitmap->rows;

		for (int y = yStart; y < yMax; y++)
		{
			for (int x = xStart; x < xMax; x++)
			{
				// Clip pixels outsize the cell
				if (y < 0 || x < 0 || x >= FNT_CELL_SIZE || y >= FNT_CELL_SIZE)
					continue;

				// Copy pixel
				int srcOff = (y - yStart) * bitmap->width + (x - xStart);
				int dstOff = cell_offset + y * FNT_PIXMAP_WIDTH + x;
				out_pixmap.data[dstOff] = bitmap->buffer[srcOff];
			}
		}
	}
}

// Converts a freetype font to a GameCube compressed font
static std::vector<uint8_t> freetype_to_fnt(const std::vector<uint8_t>& font_buf, font_type type, bool dither)
{
	// Get font table from font type
	const uint16_t* font_table;
	unsigned font_table_size;

	if (type == font_type::windows_1252)
	{
		font_table = windows_1252_font_table;
		font_table_size = sizeof(windows_1252_font_table) / 2;
	}
	else
	{
		font_table = shift_jis_font_table;
		font_table_size = sizeof(shift_jis_font_table) / 2;
	}

	// Generate pixmap
	std::vector<uint8_t> widths;
	image8 pixmap;
	freetype_to_fnt_data(font_buf, font_table, font_table_size, widths, pixmap);

	// Dither image
	if (dither)
		dither_4colour(pixmap);

	// Scramble pixmap, generate fnt header and compress
	return yay0_compress(generate_fnt(type, widths, i2encode(pixmap)));
}

static void usage()
{
	std::cerr << "GameCube font tool" << std::endl;
	std::cerr << std::endl;
	std::cerr << "gc-font-tool <mode> <input> <output>" << std::endl;
	std::cerr << " c = compress using yay0" << std::endl;
	std::cerr << " d = decompress a yay0 file" << std::endl;
	std::cerr << " a = generate a windows-1252 gamecube font file from a true type font" << std::endl;
	std::cerr << " s = generate a shift jis gamecube font file from a true type font" << std::endl;
	std::cerr << " b = like a, but do not dither the final image" << std::endl;
	std::cerr << " t = like s, but do not dither the final image" << std::endl;
	std::cerr << " v = generate a bitmap showing the contents of a gamecube font file" << std::endl;
	std::cerr << " input and output may be files or - for stdin/stdout" << std::endl;
}

// Reads an entire file into a vector
static std::vector<uint8_t> read_file(const std::string& filename)
{
	std::ifstream in_file;
	std::istream* input;

	// Open stream
	if (filename == "-")
	{
		std::cin.exceptions(std::ios::failbit);
		input = &std::cin;
	}
	else
	{
		in_file.exceptions(std::ios::failbit);
		in_file.open(filename, std::ios::in | std::ios::binary);
		input = &in_file;
	}

	return std::vector<uint8_t>(std::istreambuf_iterator<char>(*input),
		                        std::istreambuf_iterator<char>());
}

// Writes a byte vector to a file
static void write_file(const std::string& filename, const std::vector<uint8_t> data)
{
	std::ofstream out_file;
	std::ostream* output;

	// Open stream
	if (filename == "-")
	{
		std::cout.exceptions(std::ios::failbit);
		output = &std::cout;
	}
	else
	{
		out_file.exceptions(std::ios::failbit);
		out_file.open(filename, std::ios::out | std::ios::binary);
		output = &out_file;
	}

	std::copy(data.begin(), data.end(),
	          std::ostreambuf_iterator<char>(*output));
}

int main(int argc, char* argv[])
{
	// Get arguments
	if (argc != 4)
	{
		usage();
		return 1;
	}

	try
	{
		// Read input file
		std::vector<uint8_t> input = read_file(argv[2]);

		// Do operation
		const std::string mode = argv[1];
		char mode_char = 0;

		if (mode.length() == 2 && mode[0] == '-')
			mode_char = mode[1];
		else if (mode.length() == 1)
			mode_char = mode[0];

		std::vector<uint8_t> result;
		switch (mode_char)
		{
			case 'c': result = yay0_compress(input); break;
			case 'd': result = yay0_decompress(input); break;
			case 'a': result = freetype_to_fnt(input, font_type::windows_1252, true); break;
			case 's': result = freetype_to_fnt(input, font_type::shift_jis, true); break;
			case 'b': result = freetype_to_fnt(input, font_type::windows_1252, false); break;
			case 't': result = freetype_to_fnt(input, font_type::shift_jis, false); break;
			case 'v': result = fnt_to_bmp(input); break;
			default:
				usage();
				return 1;
		}

		// Write output file
		write_file(argv[3], result);
		return 0;
	}
	catch (const std::ios_base::failure& e)
	{
		std::cerr << "gc-font-tool: io error: " << std::strerror(errno) << std::endl;
		return 1;
	}
	catch (const std::runtime_error& e)
	{
		std::cerr << "gc-font-tool: " << e.what() << std::endl;
		return 1;
	}
}
