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btstack_base64_decoder: use spaces

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This commit is contained in:
Matthias Ringwald 2018-10-15 22:08:32 +02:00
parent b49e5c7f18
commit f5335e47a7
2 changed files with 63 additions and 63 deletions
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122
src/btstack_base64_decoder.c
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@ -68,7 +68,7 @@ static const uint8_t table[256] = {
* @param context * @param context
*/ */
void btstack_base64_decoder_init(btstack_base64_decoder_t * context){ void btstack_base64_decoder_init(btstack_base64_decoder_t * context){
memset(context, 0, sizeof(btstack_base64_decoder_t)); memset(context, 0, sizeof(btstack_base64_decoder_t));
} }
/** /**
@ -78,70 +78,70 @@ void btstack_base64_decoder_init(btstack_base64_decoder_t * context){
*/ */
int btstack_base64_decoder_process_byte(btstack_base64_decoder_t * context, uint8_t c){ int btstack_base64_decoder_process_byte(btstack_base64_decoder_t * context, uint8_t c){
// handle '=' // handle '='
if (c == '='){ if (c == '='){
if (context->pos == 2 || context->pos == 3){ if (context->pos == 2 || context->pos == 3){
context->pos++; context->pos++;
return BTSTACK_BASE64_DECODER_MORE; return BTSTACK_BASE64_DECODER_MORE;
} }
} }
// lookup // lookup
uint8_t value = table[c]; uint8_t value = table[c];
// invalid character // invalid character
if (value == 99) { if (value == 99) {
context->pos = 99; context->pos = 99;
} }
int result = 0; int result = 0;
switch (context->pos){ switch (context->pos){
case 0: case 0:
context->value = value; // 6 bit context->value = value; // 6 bit
context->pos++; context->pos++;
result = BTSTACK_BASE64_DECODER_MORE; result = BTSTACK_BASE64_DECODER_MORE;
break; break;
case 1: case 1:
result = (context->value << 2) | (value >> 4); result = (context->value << 2) | (value >> 4);
context->value = value; // 4 bit context->value = value; // 4 bit
context->pos++; context->pos++;
break; break;
case 2: case 2:
result = (context->value << 4) | (value >> 2); result = (context->value << 4) | (value >> 2);
context->value = value; // 2 bit context->value = value; // 2 bit
context->pos++; context->pos++;
break; break;
case 3: case 3:
result = (context->value << 6) | value; result = (context->value << 6) | value;
context->pos = 0; // done context->pos = 0; // done
break; break;
case 99: case 99:
result = BTSTACK_BASE64_DECODER_INVALID; result = BTSTACK_BASE64_DECODER_INVALID;
break; break;
} }
return result; return result;
} }
int btstack_base64_decoder_process_block(const uint8_t * input_data, uint32_t input_size, uint8_t * output_buffer, uint32_t output_max_size){ int btstack_base64_decoder_process_block(const uint8_t * input_data, uint32_t input_size, uint8_t * output_buffer, uint32_t output_max_size){
btstack_base64_decoder_t context; btstack_base64_decoder_t context;
btstack_base64_decoder_init(&context); btstack_base64_decoder_init(&context);
uint32_t size = 0; uint32_t size = 0;
while (input_size){ while (input_size){
uint8_t data = *input_data++; uint8_t data = *input_data++;
int result = btstack_base64_decoder_process_byte(&context, data); int result = btstack_base64_decoder_process_byte(&context, data);
input_size--; input_size--;
switch (result){ switch (result){
case BTSTACK_BASE64_DECODER_MORE: case BTSTACK_BASE64_DECODER_MORE:
break; break;
case BTSTACK_BASE64_DECODER_INVALID: case BTSTACK_BASE64_DECODER_INVALID:
return BTSTACK_BASE64_DECODER_INVALID; return BTSTACK_BASE64_DECODER_INVALID;
default: default:
if (size >= output_max_size){ if (size >= output_max_size){
return BTSTACK_BASE64_DECODER_FULL; return BTSTACK_BASE64_DECODER_FULL;
} }
output_buffer[size++] = result; output_buffer[size++] = result;
break; break;
} }
} }
return size; return size;
} }

4
src/btstack_base64_decoder.h
View File

@ -45,8 +45,8 @@
#include <stdint.h> #include <stdint.h>
typedef struct { typedef struct {
uint8_t pos; uint8_t pos;
uint8_t value; uint8_t value;
} btstack_base64_decoder_t; } btstack_base64_decoder_t;
#define BTSTACK_BASE64_DECODER_MORE -1 #define BTSTACK_BASE64_DECODER_MORE -1