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Added base64 helper (#4866)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
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Evgeny 2024-04-24 05:07:07 +02:00 committed by GitHub
parent 1ac855f2e0
commit a7079f8fba
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2 changed files with 107 additions and 0 deletions
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97
esphome/core/helpers.cpp
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@ -433,6 +433,103 @@ int8_t step_to_accuracy_decimals(float step) {
return str.length() - dot_pos - 1;
}
static inline bool is_base64(char c) { return (isalnum(c) || (c == '+') || (c == '/')); }
std::string base64_encode(const std::vector<uint8_t> &buf) { return base64_encode(buf.data(), buf.size()); }
std::string base64_encode(const char *buf, unsigned int buf_len) {
std::string ret;
int i = 0;
int j = 0;
char char_array_3[3];
char char_array_4[4];
while (buf_len--) {
char_array_3[i++] = *(buf++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (i = 0; (i < 4); i++)
ret += BASE64_CHARS[char_array_4[i]];
i = 0;
}
}
if (i) {
for (j = i; j < 3; j++)
char_array_3[j] = '\0';
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; (j < i + 1); j++)
ret += BASE64_CHARS[char_array_4[j]];
while ((i++ < 3))
ret += '=';
}
return ret;
}
size_t base64_decode(const std::string &encoded_string, uint8_t *buf, size_t buf_len) {
std::vector<uint8_t> decoded = base64_decode(encoded_string);
if (decoded.size() > buf_len) {
ESP_LOGW(TAG, "Base64 decode: buffer too small, truncating");
decoded.resize(buf_len);
}
memcpy(buf, decoded.data(), decoded.size());
return decoded.size();
}
std::vector<uint8_t> base64_decode(const std::string &encoded_string) {
int in_len = encoded_string.size();
int i = 0;
int j = 0;
int in = 0;
uint8_t char_array_4[4], char_array_3[3];
std::vector<uint8_t> ret;
while (in_len-- && (encoded_string[in] != '=') && is_base64(encoded_string[in])) {
char_array_4[i++] = encoded_string[in];
in++;
if (i == 4) {
for (i = 0; i < 4; i++)
char_array_4[i] = BASE64_CHARS.find(char_array_4[i]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; (i < 3); i++)
ret.push_back(char_array_3[i]);
i = 0;
}
}
if (i) {
for (j = i; j < 4; j++)
char_array_4[j] = 0;
for (j = 0; j < 4; j++)
char_array_4[j] = BASE64_CHARS.find(char_array_4[j]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; (j < i - 1); j++)
ret.push_back(char_array_3[j]);
}
return ret;
}
// Colors
float gamma_correct(float value, float gamma) {

10
esphome/core/helpers.h
View File

@ -435,6 +435,16 @@ std::string value_accuracy_to_string(float value, int8_t accuracy_decimals);
/// Derive accuracy in decimals from an increment step.
int8_t step_to_accuracy_decimals(float step);
static const std::string BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
std::string base64_encode(const uint8_t *buf, size_t buf_len);
std::string base64_encode(const std::vector<uint8_t> &buf);
std::vector<uint8_t> base64_decode(const std::string &encoded_string);
size_t base64_decode(std::string const &encoded_string, uint8_t *buf, size_t buf_len);
///@}
/// @name Colors