diff options
Diffstat (limited to 'host/utils/cdecode.c')
| -rw-r--r-- | host/utils/cdecode.c | 160 |
1 files changed, 80 insertions, 80 deletions
diff --git a/host/utils/cdecode.c b/host/utils/cdecode.c index 0a9b5c46b..1d09cbe22 100644 --- a/host/utils/cdecode.c +++ b/host/utils/cdecode.c @@ -1,80 +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;
-}
+/* +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; +} |