1 files changed, 111 insertions, 0 deletions
diff --git a/src/core/basetypes/MCBase64.c b/src/core/basetypes/MCBase64.c
new file mode 100644
index 00000000..87ee97bd
--- /dev/null
+++ b/src/core/basetypes/MCBase64.c
@@ -0,0 +1,111 @@
+//
+//  MCBase64.c
+//  mailcore2
+//
+//  Created by DINH Viêt Hoà on 7/30/13.
+//  Copyright (c) 2013 MailCore. All rights reserved.
+//
+
+#include "MCBase64.h"
+
+#include <stdlib.h>
+
+#define CHAR64(c)  (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
+
+static char index_64[128] = {
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+    52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+    -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+    15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
+    -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+    41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+};
+
+static char basis_64[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+char * MCEncodeBase64(const char * in, int len)
+{
+    char * output, * tmp;
+    unsigned char oval;
+    int out_len;
+    
+    out_len = ((len + 2) / 3 * 4) + 1;
+    
+    if ((len > 0) && (in == NULL))
+        return NULL;
+    
+    output = malloc(out_len);
+    if (!output)
+        return NULL;
+    
+    tmp = output;
+    while (len >= 3) {
+        *tmp++ = basis_64[in[0] >> 2];
+        *tmp++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
+        *tmp++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
+        *tmp++ = basis_64[in[2] & 0x3f];
+        in += 3;
+        len -= 3;
+    }
+    if (len > 0) {
+        *tmp++ = basis_64[in[0] >> 2];
+        oval = (in[0] << 4) & 0x30;
+        if (len > 1) oval |= in[1] >> 4;
+        *tmp++ = basis_64[oval];
+        *tmp++ = (len < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
+        *tmp++ = '=';
+    }
+    
+    *tmp = '\0';
+    
+    return output;
+}
+
+char * MCDecodeBase64(const char * in, int len)
+{
+    char * output, * out;
+    int i, c1, c2, c3, c4, out_len;
+    int max_out_len;
+    
+    out_len = 0;
+    max_out_len = ((len + 3) * 4 / 3) + 1;
+    
+    output = malloc(max_out_len);
+    if (output == NULL)
+        return NULL;
+    out = output;
+    
+    if (in[0] == '+' && in[1] == ' ')
+        in += 2;
+    
+    for (i = 0; i < (len / 4); i++) {
+        c1 = in[0];
+        c2 = in[1];
+        c3 = in[2];
+        c4 = in[3];
+        if (CHAR64(c1) == -1 || CHAR64(c2) == -1 ||
+            (c3 != '=' && CHAR64(c3) == -1) ||
+            (c4 != '=' && CHAR64(c4) == -1)) {
+            free(out);
+            return NULL;
+        }
+        
+        in += 4;
+        *output++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4);
+        
+        if (c3 != '=') {
+            *output++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2);
+            
+            if (c4 != '=') {
+                *output++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4);
+            }
+        }
+    }
+    
+    *output = 0;
+    
+    return out;
+}