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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* number.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "internal.h"
int read_octal(const char *str, int digits, uint64_t *out)
{
uint64_t result = 0;
while (digits > 0 && isspace(*str)) {
++str;
--digits;
}
while (digits > 0 && *str >= '0' && *str <= '7') {
if (result > 0x1FFFFFFFFFFFFFFFUL) {
fputs("numeric overflow parsing tar header\n", stderr);
return -1;
}
result = (result << 3) | (*(str++) - '0');
--digits;
}
*out = result;
return 0;
}
int read_binary(const char *str, int digits, uint64_t *out)
{
uint64_t x, ov, result = 0;
bool first = true;
while (digits > 0) {
x = *((const unsigned char *)str++);
--digits;
if (first) {
first = false;
if (x == 0xFF) {
result = 0xFFFFFFFFFFFFFFFFUL;
} else {
x &= 0x7F;
result = 0;
if (digits > 7 && x != 0)
goto fail_ov;
}
}
ov = (result >> 56) & 0xFF;
if (ov != 0 && ov != 0xFF)
goto fail_ov;
result = (result << 8) | x;
}
*out = result;
return 0;
fail_ov:
fputs("numeric overflow parsing tar header\n", stderr);
return -1;
}
int read_number(const char *str, int digits, uint64_t *out)
{
if (*((unsigned char *)str) & 0x80)
return read_binary(str, digits, out);
return read_octal(str, digits, out);
}
int pax_read_decimal(const char *str, uint64_t *out)
{
uint64_t result = 0;
while (*str >= '0' && *str <= '9') {
if (result > 0xFFFFFFFFFFFFFFFFUL / 10) {
fputs("numeric overflow parsing pax header\n", stderr);
return -1;
}
result = (result * 10) + (*(str++) - '0');
}
*out = result;
return 0;
}
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