Skip to content

Commit

Permalink
fix libb64
Browse files Browse the repository at this point in the history 
Implements: esp8266/Arduino#2883
Fixes: #313
Fixes: #344
  • Loading branch information
@me-no-dev
me-no-dev committed May 6, 2017
1 parent 673f453 commit 450df7e
Showing 1 changed file with 81 additions and 76 deletions.
157 changes: 81 additions & 76 deletions cores/esp32/libb64/cdecode.c
View file
Expand Up @@ -6,89 +6,94 @@ For details, see http://sourceforge.net/projects/libb64
*/

#include "cdecode.h"
#include <stdint.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 (value_in < 0 || value_in > decoding_size) {
return -1;
}
return decoding[(int)value_in];
static int base64_decode_value_signed(int8_t value_in){
static const int8_t 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 int8_t decoding_size = sizeof(decoding);
value_in -= 43;
if (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;
}

void base64_init_decodestate(base64_decodestate* state_in)
{
state_in->step = step_a;
state_in->plainchar = 0;
static int base64_decode_block_signed(const int8_t* code_in, const int length_in, int8_t* plaintext_out, base64_decodestate* state_in){
const int8_t* codechar = code_in;
int8_t* plainchar = plaintext_out;
int8_t 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 = (int8_t)base64_decode_value_signed(*codechar++);
} while (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 = (int8_t)base64_decode_value_signed(*codechar++);
} while (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 = (int8_t)base64_decode_value_signed(*codechar++);
} while (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 = (int8_t)base64_decode_value_signed(*codechar++);
} while (fragment < 0);
*plainchar++ |= (fragment & 0x03f);
}
}
/* control should not reach here */
return plainchar - plaintext_out;
}

int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in)
{
const char* codechar = code_in;
char* plainchar = plaintext_out;
char fragment;
static int base64_decode_chars_signed(const int8_t* code_in, const int length_in, int8_t* plaintext_out){
base64_decodestate _state;
base64_init_decodestate(&_state);
int len = base64_decode_block_signed(code_in, length_in, plaintext_out, &_state);
if(len > 0) plaintext_out[len] = 0;
return len;
}

*plainchar = state_in->plainchar;
int base64_decode_value(char value_in){
return base64_decode_value_signed(*((int8_t *) &value_in));
}

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 (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 (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 (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 (fragment < 0);
*plainchar++ |= (fragment & 0x03f);
}
}
/* control should not reach here */
return plainchar - plaintext_out;
int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in){
return base64_decode_block_signed((int8_t *) code_in, length_in, (int8_t *) plaintext_out, state_in);
}

int base64_decode_chars(const char* code_in, const int length_in, char* plaintext_out)
{
base64_decodestate _state;
base64_init_decodestate(&_state);
int len = base64_decode_block(code_in, length_in, plaintext_out, &_state);
if(len > 0) {
plaintext_out[len] = 0;
}
return len;
int base64_decode_chars(const char* code_in, const int length_in, char* plaintext_out){
return base64_decode_chars_signed((int8_t *) code_in, length_in, (int8_t *) plaintext_out);
}

0 comments on commit 450df7e

Please sign in to comment.