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| author | Ben Hilburn <ben.hilburn@ettus.com> | 2014-02-04 11:04:07 -0800 |
|---|---|---|
| committer | Ben Hilburn <ben.hilburn@ettus.com> | 2014-02-04 11:04:07 -0800 |
| commit | 178ac3f1c9950d383c8f64b3df464c0f943c4a23 (patch) | |
| tree | 318ed621a7b59b7d34d4ce6e4a92f73f0bcef509 /host/utils/cdecode.c | |
| parent | 2718ac110fa931cc29daf7cb3dc5ab6230ee02ab (diff) | |
| download | uhd-178ac3f1c9950d383c8f64b3df464c0f943c4a23.tar.gz uhd-178ac3f1c9950d383c8f64b3df464c0f943c4a23.tar.bz2 uhd-178ac3f1c9950d383c8f64b3df464c0f943c4a23.zip | |
Merging USRP X300 and X310 support!!
Diffstat (limited to 'host/utils/cdecode.c')
| -rw-r--r-- | host/utils/cdecode.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/host/utils/cdecode.c b/host/utils/cdecode.c new file mode 100644 index 000000000..0a9b5c46b --- /dev/null +++ b/host/utils/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;
+}
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