Pppd896engsub Convert015838 Min Exclusive -
The expression raw_counter * range produces a 128‑bit product. Shifting right by 64 bits is mathematically equivalent to dividing by 2⁶⁴ (the size of the source space). This yields a perfectly rounded‑down linear mapping, which matches the historic behavior of the original PPPD firmware.
Below is a reference implementation (C99, portable). It demonstrates the use of __uint128_t for intermediate multiplication to avoid overflow on 64‑bit platforms. pppd896engsub convert015838 min exclusive
/* pppd896engsub_convert015838.c – Public domain reference implementation */
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
int pppd896engsub_convert015838(
uint64_t raw_counter,
uint64_t min,
uint64_t max,
bool min_exclusive,
uint64_t *out_converted)
/* Validate arguments first */
if (!out_converted) return -EINVAL;
if (max < min) return -ERANGE;
if (min_exclusive && raw_counter == min) return -EINVAL;
/* If the raw value lies outside the source domain, clamp it */
if (raw_counter < min) raw_counter = min;
if (raw_counter > max) raw_counter = max;
/* When min_exclusive is true we have already rejected raw_counter == min.
The remaining scaling can treat the lower bound as inclusive. */
/* Compute the scaling factor once: (max-min) / (UINT64_MAX) */
__uint128_t range = (__uint128_t)(max - min);
__uint128_t numerator = (__uint128_t)raw_counter * range;
uint64_t scaled = (uint64_t)(numerator >> 64); // division by 2^64
*out_converted = min + scaled;
return 0;
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Let me know, and I’ll tailor the steps precisely. The expression raw_counter * range produces a 128‑bit
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