Changeset 812a413 for util.c

Timestamp:

2006-06-23T18:15:28Z (18 years ago)

Author:

Wilmer van der Gaast <wilmer@…>

Branches:

master

Children:

df1694b

Parents:

00ab350

Message:

Added saner base64 encoding function (actually, moved the one from libyahoo2.c
to core, with some changes), which I need for the XML format password garbling.

File:

• util.c (modified) (1 diff)

util.c

@@ -84 +84 @@
 }
 
-static char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" "0123456789+/";
-
-/* XXX Find bug */
 char *tobase64(const char *text)
 {
-        char *out = NULL;
-        const char *c;
-        unsigned int tmp = 0;
-        int len = 0, n = 0;
-
-        c = text;
-
-        while (*c) {
-                tmp = tmp << 8;
-                tmp += *c;
-                n++;
-
-                if (n == 3) {
-                        out = g_realloc(out, len + 4);
-                        out[len] = alphabet[(tmp >> 18) & 0x3f];
-                        out[len + 1] = alphabet[(tmp >> 12) & 0x3f];
-                        out[len + 2] = alphabet[(tmp >> 6) & 0x3f];
-                        out[len + 3] = alphabet[tmp & 0x3f];
-                        len += 4;
-                        tmp = 0;
-                        n = 0;
-                }
-                c++;
-        }
-        switch (n) {
-
-        case 2:
-                tmp <<= 8;
-                out = g_realloc(out, len + 5);
-                out[len] = alphabet[(tmp >> 18) & 0x3f];
-                out[len + 1] = alphabet[(tmp >> 12) & 0x3f];
-                out[len + 2] = alphabet[(tmp >> 6) & 0x3f];
-                out[len + 3] = '=';
-                out[len + 4] = 0;
-                break;
-        case 1:
-                tmp <<= 16;
-                out = g_realloc(out, len + 5);
-                out[len] = alphabet[(tmp >> 18) & 0x3f];
-                out[len + 1] = alphabet[(tmp >> 12) & 0x3f];
-                out[len + 2] = '=';
-                out[len + 3] = '=';
-                out[len + 4] = 0;
-                break;
-        case 0:
-                out = g_realloc(out, len + 1);
-                out[len] = 0;
-                break;
-        }
+        char *out;
+        int len;
+        
+        len = strlen(text);
+        out = g_malloc((len + 2)    /* the == padding */
+                            / 3     /* every 3-byte block */
+                            * 4     /* becomes a 4-byte one */
+                            + 1);   /* and of course, ASCIIZ! */
+        
+        base64_encode_real(text, len, out, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=");
+        
         return out;
+}
+
+void base64_encode_real(const unsigned char *in, int inlen, unsigned char *out, char *b64digits)
+{
+        for (; inlen >= 3; inlen -= 3)
+        {
+                *out++ = b64digits[in[0] >> 2];
+                *out++ = b64digits[((in[0]<<4) & 0x30) | (in[1]>>4)];
+                *out++ = b64digits[((in[1]<<2) & 0x3c) | (in[2]>>6)];
+                *out++ = b64digits[in[2] & 0x3f];
+                in += 3;
+        }
+        if (inlen > 0)
+        {
+                *out++ = b64digits[in[0] >> 2];
+                if (inlen > 1)
+                {
+                        *out++ = b64digits[((in[0]<<4) & 0x30) | (in[1]>>4)];
+                        *out++ = b64digits[((in[1]<<2) & 0x3c)];
+                }
+                else
+                {
+                        *out++ = b64digits[((in[0]<<4) & 0x30) | (in[1]>>4)];
+                        *out++ = b64digits[64];
+                }
+                *out++ = b64digits[64];
+        }
+        *out = '\0';
 }