mikecarper
9fd580c89e
Add durable TempRadio, ACL, clock, bridge, GPS/I2C, USB logging, and Indicator recovery safeguards together with expanded automation, build/profile contracts, release metadata, and the hardware validation ledger.
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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namespace mesh {
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static const uint8_t CLIENT_ACL_CRC_MAGIC[4] = {'M', 'C', 'A', '1'};
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inline uint32_t updateClientACLCRC(uint32_t crc, const uint8_t* data,
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size_t length) {
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while (length-- != 0) {
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crc ^= *data++;
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for (uint8_t bit = 0; bit < 8; bit++) {
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crc = (crc >> 1) ^ (0xEDB88320UL & (uint32_t)-(int32_t)(crc & 1U));
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}
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}
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return crc;
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}
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enum ClientACLImageKind {
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CLIENT_ACL_IMAGE_INVALID,
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CLIENT_ACL_IMAGE_LEGACY,
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CLIENT_ACL_IMAGE_CRC,
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};
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inline ClientACLImageKind classifyClientACLImage(
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const uint8_t* image, size_t size,
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size_t current_record_size, size_t legacy_record_size) {
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if (size >= 8 && (size - 8) % current_record_size == 0) {
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const size_t payload_size = size - 8;
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uint32_t stored_crc;
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memcpy(&stored_crc, image + payload_size + 4, sizeof(stored_crc));
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uint32_t crc = updateClientACLCRC(0xFFFFFFFFUL, image, payload_size)
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^ 0xFFFFFFFFUL;
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if (memcmp(image + payload_size, CLIENT_ACL_CRC_MAGIC, 4) == 0
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&& stored_crc == crc) {
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return CLIENT_ACL_IMAGE_CRC;
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}
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}
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if (size % current_record_size == 0
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|| size % legacy_record_size == 0) {
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return CLIENT_ACL_IMAGE_LEGACY;
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}
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return CLIENT_ACL_IMAGE_INVALID;
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}
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} // namespace mesh
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