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[md5] Optimize MD5::get_hex() to eliminate sprintf dependency

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This commit is contained in:
J. Nick Koston
2025-09-14 10:48:26 -05:00
parent 7e6b11ce84
commit b03a651499
1 changed files with 5 additions and 2 deletions
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7
esphome/components/md5/md5.cpp
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@@ -1,4 +1,3 @@
#include <cstdio>
#include <cstring>
#include "md5.h"
#ifdef USE_MD5
@@ -44,7 +43,11 @@ void MD5Digest::get_bytes(uint8_t *output) { memcpy(output, this->digest_, 16);
void MD5Digest::get_hex(char *output) {
for (size_t i = 0; i < 16; i++) {
sprintf(output + i * 2, "%02x", this->digest_[i]);
uint8_t byte = this->digest_[i];
uint8_t high = byte >> 4;
uint8_t low = byte & 0x0F;
output[i * 2] = high < 10 ? '0' + high : 'a' + (high - 10);
output[i * 2 + 1] = low < 10 ? '0' + low : 'a' + (low - 10);
}
}