1 files changed, 93 insertions, 0 deletions

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+/* 
+ public domain BASE64 code
+ 
+ modified for cocos2d-iphone: http://www.cocos2d-iphone.org
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "base64.h"
+
+unsigned char alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+int _base64Decode( unsigned char *input, unsigned int input_len, unsigned char *output, unsigned int *output_len );
+
+int _base64Decode( unsigned char *input, unsigned int input_len, unsigned char *output, unsigned int *output_len )
+{
+    static char inalphabet[256], decoder[256];
+    int i, bits, c, char_count, errors = 0;
+        unsigned int input_idx = 0;
+        unsigned int output_idx = 0;
+
+    for (i = (sizeof alphabet) - 1; i >= 0 ; i--) {
+                inalphabet[alphabet[i]] = 1;
+                decoder[alphabet[i]] = i;
+    }
+
+    char_count = 0;
+    bits = 0;
+        for( input_idx=0; input_idx < input_len ; input_idx++ ) {
+                c = input[ input_idx ];
+                if (c == '=')
+                        break;
+                if (c > 255 || ! inalphabet[c])
+                        continue;
+                bits += decoder[c];
+                char_count++;
+                if (char_count == 4) {
+                        output[ output_idx++ ] = (bits >> 16);
+                        output[ output_idx++ ] = ((bits >> 8) & 0xff);
+                        output[ output_idx++ ] = ( bits & 0xff);
+                        bits = 0;
+                        char_count = 0;
+                } else {
+                        bits <<= 6;
+                }
+    }
+        
+        if( c == '=' ) {
+                switch (char_count) {
+                        case 1:
+                                fprintf(stderr, "base64Decode: encoding incomplete: at least 2 bits missing");
+                                errors++;
+                                break;
+                        case 2:
+                                output[ output_idx++ ] = ( bits >> 10 );
+                                break;
+                        case 3:
+                                output[ output_idx++ ] = ( bits >> 16 );
+                                output[ output_idx++ ] = (( bits >> 8 ) & 0xff);
+                                break;
+                        }
+        } else if ( input_idx < input_len ) {
+                if (char_count) {
+                        fprintf(stderr, "base64 encoding incomplete: at least %d bits truncated",
+                                        ((4 - char_count) * 6));
+                        errors++;
+                }
+    }
+        
+        *output_len = output_idx;
+        return errors;
+}
+
+int base64Decode(unsigned char *in, unsigned int inLength, unsigned char **out)
+{
+        unsigned int outLength = 0;
+        
+        //should be enough to store 6-bit buffers in 8-bit buffers
+        *out = malloc( inLength * 3.0f / 4.0f + 1 );
+        if( *out ) {
+                int ret = _base64Decode(in, inLength, *out, &outLength);
+                
+                if (ret > 0 )
+                {
+                        printf("Base64Utils: error decoding");
+                        free(*out);
+                        *out = NULL;                    
+                        outLength = 0;
+                }
+        }
+    return outLength;
+}