From 6202eb83795142abeea9fe38ee5111672b866946 Mon Sep 17 00:00:00 2001
From: ame <grantsquires@disroot.org>
Date: Thu, 2 Nov 2023 01:03:57 -0500
Subject: base64 & uuencode

---
 src/encode/uuencode.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/encode/uuencode.c

(limited to 'src/encode/uuencode.c')

diff --git a/src/encode/uuencode.c b/src/encode/uuencode.c
new file mode 100644
index 0000000..6f92fb0
--- /dev/null
+++ b/src/encode/uuencode.c
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include "../crypto.h"
+
+int uuechar_index(int c){
+    return c + 32;
+}
+
+int uueichar_index(int c){
+    return c - 32;
+}
+
+int de_uu(char* in2, char* out){
+    int len = 0;
+    for(int i = 0; in2[i]!='\0'; i++) len++;
+    char in[len*2];
+    sprintf(in," %s",in2); //padding byte to make things cleaner
+
+    //char out[len];
+    int skipped = 0;
+    for(int i = 0; i<len; i+=4){
+        if((i - skipped*2)%60==0){
+            i+=2;
+            skipped+=1;
+        };
+
+        uint8_t u1 = i>len?0:in[i];
+        uint8_t u2 = i+1>len?0:in[i+1];
+        uint8_t u3 = i+2>len?0:in[i+2];
+        uint8_t u4 = i+3>len?0:in[i+3];
+        
+        u1 = uueichar_index(u1);
+        u2 = uueichar_index(u2);
+        u3 = uueichar_index(u3);
+        u4 = uueichar_index(u4);
+        
+        uint8_t left = u1 << 2 | u2 >> 4;
+        uint8_t middle = u2 << 4 | u3 >> 2;
+        uint8_t right = u3 << 6 | u4;
+        if(u1 < 64 && u2 < 64){
+            sprintf(out,"%s%c",out,left);
+        }
+        if(u2 < 64 && u3 < 64){
+            sprintf(out,"%s%c",out,middle);
+        }
+        if(u3 < 64 && u4 < 64){
+            sprintf(out,"%s%c",out,right);
+        }
+        
+    }
+    return 0;
+}
+int en_uu(char* in, char* out){
+    int len = 0;
+    for(int i = 0; in[i]!='\0'; i++) len++;
+
+    for(int i = 0; i < len; i+=3){
+        uint8_t f = i>len?0:in[i];
+        uint8_t s = i+1>len?0:in[i+1];
+        uint8_t t = i+2>len?0:in[i+2];
+        
+        uint8_t i1 = f>>2;
+        uint8_t i2 = (uint8_t)(f<<6)>>2 | (s>>4);
+        uint8_t i3 = (uint8_t)(s<<4)>>2 | (t>>6);
+        uint8_t i4 = t & 0x3f;
+        
+        if(t==0)i4 = 64;
+        if(s==0)i3 = 64;
+        if(i / 3 * 4 % 60 == 0){
+            if(i==0) sprintf(out,"%c",(len - i >= 45) ? 'M':uuechar_index(len - i));
+            else sprintf(out,"%s\n%c",out,(len - i >= 45) ? 'M':uuechar_index(len - i));
+        }
+        sprintf(out,"%s%c%c%c%c",out,uuechar_index(i1),uuechar_index(i2),
+                uuechar_index(i3),uuechar_index(i4));
+    }
+    sprintf(out,"%s\n`",out);
+    
+    return 0;
+}
+
+
+
+int l_uuencode(lua_State* L){  
+  size_t len;
+  const char* _a = lua_tolstring(L, 1, &len);
+  char *a = calloc(len, sizeof * a);
+  memcpy(a, _a, len);
+  
+  char* encode = calloc(len * 3,sizeof * encode);
+  en_uu(a, encode);
+  lua_pushstring(L, encode);
+
+  free(a);
+  free(encode);
+  return 1;
+};
+
+int l_uudecode(lua_State* L){
+  size_t len;
+  const char* _a = lua_tolstring(L, 1, &len);
+  char *a = calloc(len, sizeof * a);
+  memcpy(a, _a, len);
+  
+  char* encode = calloc(len,sizeof * encode);
+  de_uu(a, encode);
+  lua_pushstring(L, encode);
+
+  free(a);
+  free(encode);
+  return 1; 
+};
-- 
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