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1 <?xml version="1.0" encoding="utf-8"?>
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2 <?xml-stylesheet type="text/css" href="../style.css"?>
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3 <!DOCTYPE html>
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4 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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5 <head>
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6 <title>T6RP format</title>
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7 </head>
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8 <body>
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9 <h1>T6RP format</h1>
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10 <p>The T6RP format is the replay format used by EoSD.</p>
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11
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12 <p>It is composed of a header and an "encrypted" data section, which is itself composed of a header, per-stage structures and lists of keystates.</p>
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13
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14
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15 <h2>Header</h2>
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16 <pre>
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17 typedef struct {
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18 char magic[4]; // T6RP
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19 uint16_t unknown; //TODO: always 0x0102
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20 // Seems to be a switch, if 0x0102 do something, else (whatever the value is), do something else
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21 uint8_t player; // 0 = ReimuA, 1 = ReimuB, 2 = MarisaA, 3 = MarisaB
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22 uint8_t rank; // 0 = Easy, 3 = Lunatic, 4 = Extra
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23 uint32_t checksum; // (0x3f000318 + key + sum(c for c in decrypted_data)) % (2 ** 32)
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24 uint16_t unknown2; //TODO: seems to be ignored by the game
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25 uint8_t key;
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26 char crypted_data[]; // crypted(a, i) = (a + key + 7*i) % 256
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27 // decrypted(c, i) = (c - key - 7*i) % 256
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28 } thrpy6_header_t;
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29 </pre>
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30
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31 <h2>Decrypting the data section.</h2>
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32 <p>As stated earlier, the data section is encrypted. Luckily, this encryption is quite simplistic, and encrypting/decrypting it is easy (see this snippet of python3 code):</p>
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33 <pre>
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34 def decrypt(key, data):
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35 return bytes((c - key - 7 * i) % 256 for i, c in enumerate(data))
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36
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37 def encrypt(key, data):
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38 return bytes((c + key + 7 * i) % 256 for i, c in enumerate(data))
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39 </pre>
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40
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41 <h2>Encrypted header</h2>
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42 <pre>
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43 typedef struct {
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44 uint8_t unknown; //TODO: seems to be ignored by the game
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45 char date[9]; // null-terminated string
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46 char name[9]; // null-terminated string
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47 uint16_t unknown2; //TODO: seems to be ignored by the game
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48 uint32_t score; //TODO: Total score. seems to be ignored by the game
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49 uint32_t unknown3; //TODO: seems to be ignored by the game
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50 float slowdown_rate; // As a percentage, not a proper rate
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51 uint8_t unknwon[4]; //TODO: seems to have no effect
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52 uint32_t stage1_offset; // Offset of a thrpy6_stage_t from the start of the file (including the unencrypted header)
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53 uint32_t stage2_offset;
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54 uint32_t stage3_offset;
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55 uint32_t stage4_offset;
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56 uint32_t stage5_offset;
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57 uint32_t stage6_offset;
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58 uint32_t stage7_offset;
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59 } thrpy6_encrypted_header;
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60 </pre>
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61
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62 <h2>Stage entry</h2>
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63 <pre>
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64 typedef struct {
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65 uint32_t score;
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66 uint16_t random_seed;
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67 uint16_t unknown1; //TODO: seems to be ignored by the game
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68 uint8_t power;
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69 int8_t lives;
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70 int8_t bombs;
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71 uint8_t difficulty; //TODO: WARNING: This has a huge effect on the game!
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72 // It is also called rank (but we use the term "difficulty" because "rank" is the official name for Easy/Normal/Hard/Lunatic/Extra)
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73 // See: http://en.touhouwiki.net/wiki/Embodiment_of_Scarlet_Devil/Gameplay#Rank
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74 uint8_t unknown3[3]; //TODO: seems to be ignored by the game. Padding?
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75 thrpy6_keystate_t keystates[];
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76 } thrpy6_stage_t;
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77 </pre>
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78
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79 <h2>Keystates</h2>
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80 <pre>
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81 struct {
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82 uint32_t time; // Time of the event, most probably exprimed in frames
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83 uint16_t keys; // 1 = shoot, 2 = bomb, 4 = focus, 8 = ?, 16 = up, 32 = down, 64 = left, 128 = right
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84 uint16_t unknown; //TODO: seems to be ignored by the game
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85 } thrpy6_keystate_t;
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86 </pre>
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87 </body>
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88 </html>
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