Mercurial > touhou-doc
annotate 06/t6rp.xhtml @ 12:79dfd9765a67
I *really* should commit more often.
| author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> |
|---|---|
| date | Tue, 04 Oct 2011 11:45:04 +0200 |
| parents | 9f0e37b7eeab |
| children | 2925b0e246c6 |
| rev | line source |
|---|---|
| 8 | 1 <?xml version="1.0" encoding="utf-8"?> |
| 2 <?xml-stylesheet type="text/css" href="../style.css"?> | |
| 3 <!DOCTYPE html> | |
| 4 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> | |
| 5 <head> | |
| 6 <title>T6RP format</title> | |
| 7 </head> | |
| 8 <body> | |
| 9 <h1>T6RP format</h1> | |
| 10 <p>The T6RP format is the replay format used by EoSD.</p> | |
| 11 | |
| 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> | |
| 13 | |
| 14 | |
| 15 <h2>Header</h2> | |
| 16 <pre> | |
| 17 typedef struct { | |
| 18 char magic[4]; // T6RP | |
| 19 uint16_t unknown; //TODO: always 0x0102 | |
| 20 // Seems to be a switch, if 0x0102 do something, else (whatever the value is), do something else | |
| 21 uint8_t player; // 0 = ReimuA, 1 = ReimuB, 2 = MarisaA, 3 = MarisaB | |
| 22 uint8_t rank; // 0 = Easy, 3 = Lunatic, 4 = Extra | |
| 23 uint32_t checksum; // (0x3f000318 + key + sum(c for c in decrypted_data)) % (2 ** 32) | |
|
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9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
24 uint16_t unknown2; //TODO: seems to be ignored by the game. |
| 8 | 25 uint8_t key; |
| 26 char crypted_data[]; // crypted(a, i) = (a + key + 7*i) % 256 | |
| 27 // decrypted(c, i) = (c - key - 7*i) % 256 | |
| 28 } thrpy6_header_t; | |
| 29 </pre> | |
| 30 | |
|
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9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
31 <h2>Decrypting the data section</h2> |
| 8 | 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> |
| 33 <pre> | |
| 34 def decrypt(key, data): | |
| 35 return bytes((c - key - 7 * i) % 256 for i, c in enumerate(data)) | |
| 36 | |
| 37 def encrypt(key, data): | |
| 38 return bytes((c + key + 7 * i) % 256 for i, c in enumerate(data)) | |
| 39 </pre> | |
| 40 | |
| 41 <h2>Encrypted header</h2> | |
| 42 <pre> | |
| 43 typedef struct { | |
|
11
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
44 uint8_t unknown; //TODO: seems to be ignored by the game. Padding? |
| 8 | 45 char date[9]; // null-terminated string |
| 46 char name[9]; // null-terminated string | |
|
11
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
47 uint16_t unknown2; //TODO: seems to be ignored by the game. Padding? |
|
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
48 uint32_t score; //TODO: Total score. seems to be ignored by the game. |
|
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
49 uint32_t unknown3; //TODO: seems to be ignored by the game. |
| 8 | 50 float slowdown_rate; // As a percentage, not a proper rate |
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11
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
51 uint32_t unknown4; //TODO: seems to be ignored by the game. |
| 8 | 52 uint32_t stage1_offset; // Offset of a thrpy6_stage_t from the start of the file (including the unencrypted header) |
| 53 uint32_t stage2_offset; | |
| 54 uint32_t stage3_offset; | |
| 55 uint32_t stage4_offset; | |
| 56 uint32_t stage5_offset; | |
| 57 uint32_t stage6_offset; | |
| 58 uint32_t stage7_offset; | |
| 59 } thrpy6_encrypted_header; | |
| 60 </pre> | |
| 61 | |
| 62 <h2>Stage entry</h2> | |
| 63 <pre> | |
| 64 typedef struct { | |
| 65 uint32_t score; | |
| 66 uint16_t random_seed; | |
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11
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
67 uint16_t unknown1; //TODO: seems to be ignored by the game. |
| 8 | 68 uint8_t power; |
| 69 int8_t lives; | |
| 70 int8_t bombs; | |
| 71 uint8_t difficulty; //TODO: WARNING: This has a huge effect on the game! | |
| 72 // It is also called rank (but we use the term "difficulty" because "rank" is the official name for Easy/Normal/Hard/Lunatic/Extra) | |
| 73 // See: http://en.touhouwiki.net/wiki/Embodiment_of_Scarlet_Devil/Gameplay#Rank | |
| 74 uint8_t unknown3[3]; //TODO: seems to be ignored by the game. Padding? | |
| 75 thrpy6_keystate_t keystates[]; | |
| 76 } thrpy6_stage_t; | |
| 77 </pre> | |
| 78 | |
| 79 <h2>Keystates</h2> | |
| 80 <pre> | |
| 81 struct { | |
|
11
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
82 uint32_t time; // Time of the event, most probably exprimed in frames. |
|
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
83 uint16_t keys; // 1 = shoot, 2 = bomb, 4 = focus, 8 = ?, 16 = up, 32 = down, 64 = left, 128 = right, 256 = skip dialogs |
|
9f0e37b7eeab
Some fixes in the replay format.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
8
diff
changeset
|
84 uint16_t unknown; //TODO: seems to be ignored by the game. |
| 8 | 85 } thrpy6_keystate_t; |
| 86 </pre> | |
| 87 </body> | |
| 88 </html> |