init

README.md

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+Put it somewhere in your path and run it like this:
+
+    vooblyslpdecode slp_in.slp slp_out.slp
+
+For automation, create a dir called "decoded", and run the following in a CMD:
+
+    for %I in (*.slp) do vooblyslpdecode "%I" "decoded\%~nI.slp"
+
+Compiled with:
+
+    gcc -s -static -o vooblyslpdecode.exe vooblyslpdecode.c

vooblyslpdecode.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+typedef unsigned char uchar;
+typedef unsigned int uint;
+
+FILE*
+fopen_f(const char *path, const char *mode)
+{
+    FILE *f;
+
+    f = fopen(path, mode);
+
+    if(f == NULL) {
+        fprintf(stderr, "error: couldn't open file (create the directory?) %s\n", path);
+        exit(1);
+    }
+
+    return f;
+}
+
+int main(int argc, char *argv[])
+{
+    uchar *fslp;
+    uint beef1337;
+    int fsize, i;
+    FILE *f;
+
+    if(argc < 3) {
+        fprintf(stderr, "usage: vooblyslpdecode slp_in.slp slp_out.slp\n");
+        return 1;
+    }
+
+    f = fopen_f(argv[1], "rb");
+    fread(&beef1337, 1, 4, f);
+
+    if(beef1337 != 0xBEEF1337) {
+        fprintf(stderr, "error: not a voobly encoded slp file\n");
+        return 1;
+    }
+
+    fseek(f, 0, SEEK_END);
+    fsize = ftell(f) - 4;
+    fseek(f, 4, SEEK_SET);
+
+    fslp = malloc(fsize);
+    fread(fslp, 1, fsize, f);
+    fclose(f);
+
+    for(i = 0; i < fsize; i++)
+        fslp[i] = 0x20 * ((fslp[i] - 17) ^ 0x23) | ((uchar)((fslp[i] - 17) ^ 0x23) >> 3);
+
+    f = fopen_f(argv[2], "wb");
+    fwrite(fslp, 1, fsize, f);
+    fclose(f);
+}