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reverse-engineer subcommands sent during game join

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This commit is contained in:
Martin Michelsen
2022-10-03 21:44:30 -07:00
parent a16c207f4d
commit 50e1b79b1e
4 changed files with 142 additions and 14 deletions
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src/CommandFormats.hh
+85 -4
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@@ -3224,12 +3224,93 @@ struct G_EnemyDropItemRequest_PC_V3_BB_6x60 : G_EnemyDropItemRequest_DC_6x60 {
// 68: Telepipe/Ryuker
// 69: Unknown (supported; game only)
// 6A: Unknown (supported; game only; not valid on Episode 3)
// 6B: Sync enemy state (used while loading into game)
// 6C: Sync object state (used while loading into game)
// 6D: Sync item state (used while loading into game)
// 6B: Sync enemy state (used while loading into game; same header format as 6E)
// 6C: Sync object state (used while loading into game; same header format as 6E)
// 6D: Sync item state (used while loading into game; same header format as 6E)
// 6E: Sync flag state (used while loading into game)
struct G_SyncGameStateHeader_6x6B_6x6C_6x6D_6x6E {
uint8_t subcommand;
parray<uint8_t, 3> unused;
le_uint32_t subcommand_size;
le_uint32_t unknown_a1;
le_uint32_t data_size; // Must be <= subcommand_size - 0x10
// BC0-compressed data follows here (use bc0_decompress from Compression.hh)
};
// 6F: Unknown (used while loading into game)
// 70: Unknown (used while loading into game)
// 70: Sync player disp data and inventory (used while loading into game)
// Annoyingly, they didn't use the same format as the 65/67/68 commands here,
// and instead rearranged a bunch of things.
// TODO: Some missing fields should be easy to find in the future (e.g. when the
// sending player doesn't have 0 meseta, for example)
struct G_Unknown_6x70 {
// Offsets in this struct are relative to the overall command header
/* 0004 */ uint8_t subcommand; // == 0x70
/* 0005 */ uint8_t basic_size; // == 0
/* 0006 */ le_uint16_t unused;
/* 0008 */ le_uint32_t subcommand_size;
/* 000C */ parray<le_uint16_t, 2> unknown_a1;
// [1] and [3] in this array (and maybe [2] also) appear to be le_floats;
// they could be the player's current (x, y, z) coords
/* 0010 */ parray<le_uint32_t, 7> unknown_a2;
/* 002C */ parray<le_uint16_t, 4> unknown_a3;
/* 0034 */ parray<parray<le_uint32_t, 3>, 5> unknown_a4;
/* 0070 */ le_uint32_t unknown_a5;
/* 0074 */ le_uint32_t player_tag;
/* 0078 */ le_uint32_t guild_card_number;
/* 007C */ parray<le_uint32_t, 2> unknown_a6;
/* 0084 */ struct {
parray<le_uint16_t, 2> unknown_a1;
parray<le_uint32_t, 6> unknown_a2;
} unknown_a7;
/* 00A0 */ le_uint32_t unknown_a8;
/* 00A4 */ parray<uint8_t, 0x14> unknown_a9;
/* 00B8 */ le_uint32_t unknown_a10;
/* 00BC */ le_uint32_t unknown_a11;
/* 00C0 */ parray<uint8_t, 0x14> technique_levels; // Last byte is uninitialized
/* 00D4 */ struct {
parray<uint8_t, 0x10> name;
uint64_t unknown_a2; // Same as unknown_a2 in PlayerDispDataDCPCV3, presumably
le_uint32_t name_color;
uint8_t extra_model;
parray<uint8_t, 0x0F> unused;
le_uint32_t name_color_checksum;
uint8_t section_id;
uint8_t char_class;
uint8_t v2_flags;
uint8_t version;
le_uint32_t v1_flags;
le_uint16_t costume;
le_uint16_t skin;
le_uint16_t face;
le_uint16_t head;
le_uint16_t hair;
le_uint16_t hair_r;
le_uint16_t hair_g;
le_uint16_t hair_b;
le_uint32_t proportion_x;
le_uint32_t proportion_y;
} disp_part2;
/* 0124 */ struct {
PlayerStats stats;
parray<uint8_t, 0x0A> unknown_a1;
le_uint32_t level;
le_uint32_t experience;
le_uint32_t meseta;
} disp_part1;
/* 0148 */ struct {
le_uint32_t num_items;
// Entries >= num_items in this array contain uninitialized data (usually
// the contents of a previous sync command)
parray<PlayerInventoryItem, 0x1E> items;
} inventory;
/* 0494 */ le_uint32_t unknown_a15;
};
// 71: Unknown (used while loading into game)
// 72: Unknown (used while loading into game)
// 73: Invalid subcommand (but apparently valid on BB; function is unknown)
src/Compression.cc
+42
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@@ -8,6 +8,8 @@
#include <phosg/Strings.hh>
#include "Text.hh"
using namespace std;
@@ -366,3 +368,43 @@ size_t prs_decompress_size(const string& data, size_t max_size) {
}
}
}
string bc0_decompress(const string& data) {
StringReader r(data);
StringWriter w;
parray<uint8_t, 0x1000> memo;
uint16_t memo_offset = 0x0FEE;
uint16_t control_stream_bits = 0x0000;
while (!r.eof()) {
control_stream_bits >>= 1;
if ((control_stream_bits & 0x100) == 0) {
control_stream_bits = 0xFF00 | r.get_u8();
if (r.eof()) {
break;
}
}
if ((control_stream_bits & 1) == 0) {
uint8_t a1 = r.get_u8();
if (r.eof()) {
break;
}
uint8_t a2 = r.get_u8();
for (size_t z = 0; z <= (a2 & 0x0F) + 2; z++) {
uint8_t v = memo[((a1 | ((a2 << 4) & 0xF00)) + z) & 0x0FFF];
w.put_u8(v);
memo[memo_offset] = v;
memo_offset = (memo_offset + 1) & 0x0FFF;
}
} else {
uint8_t v = r.get_u8();
w.put_u8(v);
memo[memo_offset] = v;
memo_offset = (memo_offset + 1) & 0x0FFF;
}
}
return move(w.str());
}
src/Compression.hh
+2
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@@ -11,3 +11,5 @@ std::string prs_compress(const std::string& data);
std::string prs_decompress(const std::string& data, size_t max_size = 0);
size_t prs_decompress_size(const std::string& data, size_t max_size = 0);
std::string bc0_decompress(const std::string& data);
src/Main.cc
+13 -10
View File
@@ -233,8 +233,8 @@ The options are:\n\
--decompress-prs\n\
Compress or decompress data using the PRS algorithm. Both input-filename\n\
and output-filename may be specified.\n\
--decompress-gjs [input-filename [output-filename]]\n\
Decompress data using the GJS algorithm.Both input-filename and\n\
--decompress-bc0 [input-filename [output-filename]]\n\
Decompress data using the BC0 algorithm. Both input-filename and\n\
output-filename may be specified.\n\
--encrypt-data\n\
--decrypt-data\n\
@@ -309,7 +309,7 @@ enum class Behavior {
RUN_SERVER = 0,
COMPRESS_PRS,
DECOMPRESS_PRS,
DECOMPRESS_GJS,
DECOMPRESS_BC0,
ENCRYPT_DATA,
DECRYPT_DATA,
FIND_DECRYPTION_SEED,
@@ -323,7 +323,7 @@ enum class Behavior {
static bool behavior_takes_input_filename(Behavior b) {
return (b == Behavior::COMPRESS_PRS) ||
(b == Behavior::DECOMPRESS_PRS) ||
(b == Behavior::DECOMPRESS_GJS) ||
(b == Behavior::DECOMPRESS_BC0) ||
(b == Behavior::ENCRYPT_DATA) ||
(b == Behavior::DECRYPT_DATA) ||
(b == Behavior::DECODE_QUEST_FILE) ||
@@ -335,7 +335,7 @@ static bool behavior_takes_input_filename(Behavior b) {
static bool behavior_takes_output_filename(Behavior b) {
return (b == Behavior::COMPRESS_PRS) ||
(b == Behavior::DECOMPRESS_PRS) ||
(b == Behavior::DECOMPRESS_GJS) ||
(b == Behavior::DECOMPRESS_BC0) ||
(b == Behavior::ENCRYPT_DATA) ||
(b == Behavior::DECRYPT_DATA) ||
(b == Behavior::DECODE_SJIS);
@@ -374,8 +374,8 @@ int main(int argc, char** argv) {
behavior = Behavior::COMPRESS_PRS;
} else if (!strcmp(argv[x], "--decompress-prs")) {
behavior = Behavior::DECOMPRESS_PRS;
} else if (!strcmp(argv[x], "--decompress-gjs")) {
behavior = Behavior::DECOMPRESS_PRS;
} else if (!strcmp(argv[x], "--decompress-bc0")) {
behavior = Behavior::DECOMPRESS_BC0;
} else if (!strcmp(argv[x], "--encrypt-data")) {
behavior = Behavior::ENCRYPT_DATA;
} else if (!strcmp(argv[x], "--decrypt-data")) {
@@ -473,21 +473,24 @@ int main(int argc, char** argv) {
switch (behavior) {
case Behavior::COMPRESS_PRS:
case Behavior::DECOMPRESS_PRS:
case Behavior::DECOMPRESS_GJS: {
case Behavior::DECOMPRESS_BC0: {
string data = read_input_data();
if (parse_data) {
data = parse_data_string(data);
}
size_t input_bytes = data.size();
if (behavior == Behavior::COMPRESS_PRS) {
data = prs_compress(data);
} else if (behavior == Behavior::DECOMPRESS_PRS) {
data = prs_decompress(data);
} else if (behavior == Behavior::DECOMPRESS_GJS) {
data = gjs_decompress(data);
} else if (behavior == Behavior::DECOMPRESS_BC0) {
data = bc0_decompress(data);
} else {
throw logic_error("invalid behavior");
}
log_info("%zu (0x%zX) bytes input => %zu (0x%zX) bytes output",
input_bytes, input_bytes, data.size(), data.size());
write_output_data(data.data(), data.size());
break;