95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
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#include <mods/init/init.h>
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#include "skin-internal.h"
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// Base64 Encode (https://gist.github.com/tomykaira/f0fd86b6c73063283afe550bc5d77594)
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static std::string base64_encode(const std::string data) {
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static constexpr char encoding_table[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/'
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};
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size_t in_len = data.size();
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size_t out_len = 4 * ((in_len + 2) / 3);
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std::string ret(out_len, '\0');
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size_t i;
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char *p = const_cast<char*>(ret.c_str());
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for (i = 0; i < in_len - 2; i += 3) {
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*p++ = encoding_table[(data[i] >> 2) & 0x3f];
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*p++ = encoding_table[((data[i] & 0x3) << 4) | ((int) (data[i + 1] & 0xf0) >> 4)];
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*p++ = encoding_table[((data[i + 1] & 0xf) << 2) | ((int) (data[i + 2] & 0xc0) >> 6)];
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*p++ = encoding_table[data[i + 2] & 0x3f];
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}
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if (i < in_len) {
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*p++ = encoding_table[(data[i] >> 2) & 0x3f];
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if (i == (in_len - 1)) {
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*p++ = encoding_table[((data[i] & 0x3) << 4)];
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*p++ = '=';
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}
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else {
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*p++ = encoding_table[((data[i] & 0x3) << 4) | ((int) (data[i + 1] & 0xf0) >> 4)];
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*p++ = encoding_table[((data[i + 1] & 0xf) << 2)];
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}
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*p++ = '=';
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}
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return ret;
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}
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// Change Texture For Player Entities
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static void Player_username_assign_injection(std::string *target, std::string *username) {
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// Call Original Method
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*target = *username;
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// Get Player
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unsigned char *player = ((unsigned char *) target) - Player_username_property_offset;
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// Get Texture
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std::string *texture = (std::string *) (player + Mob_texture_property_offset);
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// Set Texture
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*texture = '$' + base64_encode(*username);
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}
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static void Player_username_assign_injection_2(std::string *target, const char *username) {
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std::string username_str = username;
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Player_username_assign_injection(target, &username_str);
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}
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// Change Texture For HUD
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static int32_t Textures_loadAndBindTexture_injection(unsigned char *textures, __attribute__((unused)) std::string const& name) {
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// Change Texture
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static std::string new_texture;
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if (new_texture.length() == 0) {
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std::string username = base64_encode(*default_username);
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new_texture = '$' + username;
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}
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// Call Original Method
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return (*Textures_loadAndBindTexture)(textures, new_texture);
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}
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// Init
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void init_skin() {
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// LocalPlayer
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overwrite_call((void *) 0x44c28, (void *) Player_username_assign_injection);
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// RemotePlayer
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overwrite_call((void *) 0x6ce58, (void *) Player_username_assign_injection_2);
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// ServerPlayer
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overwrite_call((void *) 0x7639c, (void *) Player_username_assign_injection_2);
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// HUD
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overwrite_call((void *) 0x4c6d0, (void *) Textures_loadAndBindTexture_injection);
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// Loader
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_init_skin_loader();
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}
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