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util.c
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util.c
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/*
* This file is part of the TREZOR project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <[email protected]>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <https://www.gnu.org/licenses/>.
*/
#include "util.h"
inline void delay(uint32_t wait)
{
while (--wait > 0) __asm__("nop");
}
static const char *hexdigits = "0123456789ABCDEF";
void uint32hex(uint32_t num, char *str)
{
for (uint32_t i = 0; i < 8; i++) {
str[i] = hexdigits[(num >> (28 - i * 4)) & 0xF];
}
}
// converts data to hexa
void data2hex(const void *data, uint32_t len, char *str)
{
const uint8_t *cdata = (uint8_t *)data;
for (uint32_t i = 0; i < len; i++) {
str[i * 2 ] = hexdigits[(cdata[i] >> 4) & 0xF];
str[i * 2 + 1] = hexdigits[cdata[i] & 0xF];
}
str[len * 2] = 0;
}
uint32_t readprotobufint(uint8_t **ptr)
{
uint32_t result = (**ptr & 0x7F);
if (**ptr & 0x80) {
(*ptr)++;
result += (**ptr & 0x7F) * 128;
if (**ptr & 0x80) {
(*ptr)++;
result += (**ptr & 0x7F) * 128 * 128;
if (**ptr & 0x80) {
(*ptr)++;
result += (**ptr & 0x7F) * 128 * 128 * 128;
if (**ptr & 0x80) {
(*ptr)++;
result += (**ptr & 0x7F) * 128 * 128 * 128 * 128;
}
}
}
}
(*ptr)++;
return result;
}