1 files changed, 80 insertions, 0 deletions
diff --git a/host/lib/usrp/x300/cdecode.c b/host/lib/usrp/x300/cdecode.c
new file mode 100644
index 000000000..1d09cbe22
--- /dev/null
+++ b/host/lib/usrp/x300/cdecode.c
@@ -0,0 +1,80 @@
+/*
+cdecoder.c - c source to a base64 decoding algorithm implementation
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#include "cdecode.h"
+
+int base64_decode_value(char value_in){
+    static const char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-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};
+    static const char decoding_size = sizeof(decoding);
+    value_in -= 43;
+    if ((signed char)value_in < 0 || value_in > decoding_size) return -1;
+    return decoding[(int)value_in];
+}
+
+void base64_init_decodestate(base64_decodestate* state_in){
+    state_in->step = step_a;
+    state_in->plainchar = 0;
+}
+
+size_t base64_decode_block(const char* code_in, const size_t length_in, char* plaintext_out, base64_decodestate* state_in){
+    const char* codechar = code_in;
+    char* plainchar = plaintext_out;
+    char fragment;
+    
+    *plainchar = state_in->plainchar;
+    
+    switch (state_in->step){
+        while (1){
+            case step_a:
+                do{
+                    if (codechar == code_in+length_in){
+                        state_in->step = step_a;
+                        state_in->plainchar = *plainchar;
+                        return plainchar - plaintext_out;
+                    }
+                    fragment = (char)base64_decode_value(*codechar++);
+                } while ((signed char)fragment < 0);
+                *plainchar = (fragment & 0x03f) << 2;
+
+            case step_b:
+                do{
+                    if (codechar == code_in+length_in){
+                        state_in->step = step_b;
+                        state_in->plainchar = *plainchar;
+                        return plainchar - plaintext_out;
+                    }
+                    fragment = (char)base64_decode_value(*codechar++);
+                } while ((signed char)fragment < 0);
+                *plainchar++ |= (fragment & 0x030) >> 4;
+                *plainchar    = (fragment & 0x00f) << 4;
+            case step_c:
+                do{
+                    if (codechar == code_in+length_in)
+                    {
+                        state_in->step = step_c;
+                        state_in->plainchar = *plainchar;
+                        return plainchar - plaintext_out;
+                    }
+                    fragment = (char)base64_decode_value(*codechar++);
+                } while ((signed char)fragment < 0);
+                *plainchar++ |= (fragment & 0x03c) >> 2;
+                *plainchar    = (fragment & 0x003) << 6;
+            case step_d:
+                do{
+                    if (codechar == code_in+length_in){
+                        state_in->step = step_d;
+                        state_in->plainchar = *plainchar;
+                        return plainchar - plaintext_out;
+                    }
+                    fragment = (char)base64_decode_value(*codechar++);
+                } while ((signed char)fragment < 0);
+                *plainchar++   |= (fragment & 0x03f);
+        }
+    }
+    /* control should not reach here */
+    return plainchar - plaintext_out;
+}