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SUPPORT-8592. Добавлены base64_decoded_length() и decode_base64_url()

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This commit is contained in:
alashkova 2024-10-11 16:15:50 +03:00
parent bf197c89cd
commit 17d40a464e
2 changed files with 90 additions and 1 deletions
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89
src/utils/base64.c
View file

@ -1,5 +1,7 @@
#include "base64.h"
#include "logger.h"
#include <assert.h>
#include <stdint.h>
@ -79,4 +81,89 @@ encode_base64_url(str_t *dst, const str_t *src)
dst->data[n * 4 + 3] = basis64_url[d];
}
}
}
}
static void
init_decode_base64_url(unsigned char **table)
{
static unsigned char basis64_url[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xFF,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F,
0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
assert(table != NULL);
*table = basis64_url;
}
int
decode_base64_url(str_t *dst, const str_t *src)
{
uint32_t value = 0;
unsigned int c;
size_t i;
size_t n = 0;
uint8_t *p = NULL;
assert(dst != NULL && !str_t_is_null(*dst));
assert(src != NULL && !str_t_is_null(*src));
if ((src->len % 4) == 1) {
LOG_ERROR("decode_base64_url failed. Desc: invalid src length (%zd)", src->len);
goto error;
}
unsigned char *basis64_url;
init_decode_base64_url(&basis64_url);
p = (uint8_t *) dst->data;
for (i = 0; i < src->len; i++) {
c = (unsigned int) src->data[i];
if (c < 128 && basis64_url[c] < 64) {
value = (value << 6) | basis64_url[c];
if ((i % 4) == 3) {
if (p != NULL) {
p[n] = (value >> 16) & 0xFF;
p[n + 1] = (value >> 8) & 0xFF;
p[n + 2] = value & 0xFF;
}
n += 3;
value = 0;
}
} else {
LOG_ERROR("decode_base64_url failed. Desc: invalid character: %c", src->data[i]);
goto error;
}
}
if ((src->len % 4) == 2) {
if (p != NULL) {
p[n] = (value >> 4) & 0xFF;
}
n++;
} else if ((src->len % 4) == 3) {
if (p != NULL) {
p[n] = (value >> 10) & 0xFF;
p[n + 1] = (value >> 2) & 0xFF;
}
n += 2;
}
dst->len = n;
return 0;
error:
LOG_ERROR("decode_base64_url exit with error");
return -1;
}

2
src/utils/base64.h
View file

@ -4,7 +4,9 @@
#include "str_t.h"
#define base64_encoded_length(len) (((len + 2) / 3) * 4)
#define base64_decoded_length(len) (((len + 3) / 4) * 3)
void encode_base64_url(str_t *dst, const str_t *src);
int decode_base64_url(str_t *dst, const str_t *src);
#endif // BASE64_H