WEBVTT 1 00:00.620 --> 00:02.420 Hello and welcome back. 2 00:02.450 --> 00:11.780 In the previous lesson I showed you how to use a loader using Python, but that loader could only patch 3 00:11.780 --> 00:14.240 one array of bytes. 4 00:14.840 --> 00:18.230 What if you want to have more than one place to patch? 5 00:18.860 --> 00:24.860 So to solve that, I've written another script called "loader_multiple_patches," which you can download 6 00:24.860 --> 00:27.440 from the resource section for this lecture. 7 00:27.680 --> 00:34.280 And this version allows you to do multiple file patches. 8 00:34.520 --> 00:38.540 Now, assuming that you have three locations that you want to patch, 9 00:38.660 --> 00:41.360 so the first one is this array of bytes. 10 00:42.290 --> 00:46.760 So you, as usual, you will put it in this, 11 00:47.360 --> 00:49.010 assign it to this variable. 12 00:49.310 --> 00:55.160 And then the bytes that you're going to use to replace will be in the second variable. 13 00:55.190 --> 00:57.920 And I rename it as "array_to_find_one" 14 00:57.920 --> 00:59.780 and "data_to_replace_one." 15 01:00.830 --> 01:04.460 And assume you have a second array of bytes which you'd like to patch. 16 01:04.490 --> 01:10.780 Then that will be under the second variable "data_to_find_two" and you just paste it here, and the data 17 01:10.780 --> 01:17.530 to replace it with is called "data_to_replace_two," which you put it here. And assume again that you have 18 01:17.530 --> 01:19.690 a third array of bytes that you want to patch. 19 01:19.690 --> 01:22.540 So you put it in a third location here. 20 01:22.570 --> 01:27.820 Third, you assign it to the third variable here, "data_to_find_three." 21 01:28.150 --> 01:35.740 And the bytes which you are going to use to replace them will be assigned to this variable "data_to_replace_three." 22 01:35.740 --> 01:36.910 "data_to_replace_three." 23 01:37.420 --> 01:40.540 So this, you can create as many as you want. 24 01:40.570 --> 01:42.580 Here we have 3, 1, 2, 3. 25 01:42.580 --> 01:48.850 So if you have a fourth one, just create another set, "data_to_replace_four," "data_to_find_four," and "data_to_replace_four." 26 01:48.850 --> 01:49.750 "data_to_replace_four." 27 01:51.130 --> 01:56.560 Now the next part is to do the same thing to this code here. 28 01:56.710 --> 01:59.230 So you duplicate it twice. 29 01:59.230 --> 02:01.330 So you have three segments here. 30 02:01.570 --> 02:08.140 The first one you rename the variable to "data_to_find_bytes_one," "data_to_replace_bytes_one." 31 02:08.140 --> 02:16.080 And here you, you put it as "data_to_find_one," which is coming from here, and "data_to_replace_one," coming 32 02:16.080 --> 02:16.890 from here. 33 02:17.610 --> 02:23.460 And then the second batch is "data_to_find_bytes_two," 34 02:23.490 --> 02:25.050 "data_to_replace_bytes_two." 35 02:25.080 --> 02:29.490 And then here, replace it with "data_to_find_two," which is coming from here. 36 02:29.520 --> 02:33.480 There are two, "data_to_replace_two," which is coming from here. 37 02:33.630 --> 02:39.870 And finally, the third batch is "data_to_find_bytes_three" and "data_to_replace_bytes_three," and the corresponding 38 02:39.870 --> 02:42.120 "data_to_find_three" and "data_to_replace_three." 39 02:42.150 --> 02:47.700 Now if you have four, let's say you have four, "data_to_find_four" and "data_to_replace_four" 40 02:47.730 --> 02:48.270 here, 41 02:48.270 --> 02:53.070 also you need to create a fourth, a fourth batch and change the variables accordingly. 42 02:53.070 --> 02:55.350 Just copy and paste and change accordingly. 43 02:55.620 --> 03:00.450 So these are the changes you make that you had, that I have made to the original script. 44 03:00.780 --> 03:01.350 You, 45 03:01.350 --> 03:06.900 so you can have as many bytes, array of bytes as you like, as many patches as you want. 46 03:06.900 --> 03:09.720 So if there are three here, there should be three here as well. 47 03:10.080 --> 03:12.240 Now the next change is over here. 48 03:12.270 --> 03:14.070 If you scroll down to the bottom, 49 03:15.360 --> 03:18.480 so you also find that now this part here has been changed. 50 03:18.510 --> 03:23.030 Originally it was a "patch_memory," which looks like this, 51 03:23.990 --> 03:25.220 a simple one. 52 03:27.590 --> 03:34.430 So now I've redone it to become a separate function, "patch_memory." 53 03:34.550 --> 03:38.150 So "patch_memory" now is here, a new function. 54 03:38.630 --> 03:42.650 Previously we just have "write_memory" directly here like this. 55 03:43.520 --> 03:47.570 And I've now, uh, redone the code. 56 03:50.360 --> 03:52.490 So now you have "patch_memory." 57 03:53.450 --> 03:58.700 So "patch_memory" is a function which will handle the patching itself, 58 03:58.700 --> 04:00.740 and you can call it multiple times. 59 04:00.770 --> 04:02.540 So here I call it three times. 60 04:02.540 --> 04:09.110 The first one is to pass the first batch of array of bytes and the "data_to_replace_bytes_one." 61 04:09.680 --> 04:17.060 The second time I call it is "data_to_find_bytes_two," the second array of bytes, and the second set of 62 04:17.240 --> 04:21.170 hex bytes to replace it with. And the third one is here. 63 04:21.200 --> 04:24.770 So we call it three times, 1, 2, 3. 64 04:24.800 --> 04:30.890 This three here is referring to, is referring to this three over here. 65 04:31.640 --> 04:32.240 First set, 66 04:32.270 --> 04:32.900 second set, 67 04:32.930 --> 04:33.560 third set. 68 04:33.590 --> 04:39.830 So if you have four here, let's say you have, you have four, four array of bytes here, also four. 69 04:39.860 --> 04:41.690 Then you will call, 70 04:42.020 --> 04:44.390 you will call this function four times. 71 04:44.630 --> 04:49.370 The fourth time will be "data_to_find_bytes_four," "data_to_replace_bytes_four." 72 04:49.370 --> 04:51.980 So you can, you can modify it accordingly. 73 04:51.980 --> 04:58.370 So this script is a template which you can use to patch more than one array of bytes. 74 04:58.580 --> 05:04.130 If you have only two, then of course you delete the third batch here and then use only two. 75 05:04.160 --> 05:07.280 And then, uh, here also we have two. 76 05:07.310 --> 05:10.580 And then down here also you have only two calls. 77 05:10.580 --> 05:15.800 So you have unlimited number of calls which you can make using this Python script. 78 05:15.800 --> 05:19.280 So I hope this makes it more flexible for you guys, 79 05:19.640 --> 05:25.160 uh, to write Python script that can patch any number of array of bytes that you like. 80 05:25.160 --> 05:26.960 So that's all for this video. 81 05:26.960 --> 05:28.340 Thank you for watching.