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[core] li_to_base64 alt code to add padding

This commit is contained in:
Glenn Strauss 2021-05-04 13:52:57 -04:00
parent 5e39c81ff2
commit 6f942adfe0
1 changed files with 23 additions and 26 deletions
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49
src/base64.c
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@ -37,6 +37,17 @@ static const signed char base64_url_reverse_table[] = {
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, /* 0x70 - 0x7F */
};
__attribute_const__
static char li_base64_padding_char (const base64_charset charset) {
switch (charset) {
default:
case BASE64_STANDARD:
return '='; /* base64_standard_table[64]; */
case BASE64_URL:
return '.'; /* base64_url_table[64]; */
}
}
static size_t li_base64_decode(unsigned char * const result, const size_t out_length, const char * const in, const size_t in_length, const base64_charset charset) {
size_t out_pos = 0; /* current output character (position) that is decoded. can contain partial result */
unsigned int group = 0; /* how many base64 digits in the current group were decoded already. each group has up to 4 digits */
@ -177,34 +188,20 @@ size_t li_to_base64_no_padding(char* out, size_t out_length, const unsigned char
}
size_t li_to_base64(char* out, size_t out_length, const unsigned char* in, size_t in_length, base64_charset charset) {
const size_t in_tuple_remainder = in_length % 3;
size_t padding_length = in_tuple_remainder ? 3 - in_tuple_remainder : 0;
size_t out_pos =
li_to_base64_no_padding(out, out_length, in, in_length, charset);
char padding;
size_t out_pos;
const size_t in_tuple_remainder = in_length % 3;
const size_t padding_length = in_tuple_remainder ? 3 - in_tuple_remainder : 0;
if (padding_length) { /* [0,1,2] */
const char padding = li_base64_padding_char(charset);
force_assert(padding_length <= out_length - out_pos);
if (padding_length > 1)
out[out_pos++] = padding;
out[out_pos++] = padding;
}
switch (charset) {
case BASE64_STANDARD:
padding = base64_standard_table[64];
break;
case BASE64_URL:
padding = base64_url_table[64];
break;
default:
force_assert(0 && "invalid charset");
}
force_assert(out_length >= padding_length);
out_pos = li_to_base64_no_padding(out, out_length - padding_length, in, in_length, charset);
while (padding_length > 0) {
out[out_pos++] = padding;
padding_length--;
}
force_assert(out_pos <= out_length);
return out_pos;
return out_pos;
}