crc8(9)

💖 crc8(9) 💖

okay so bestie, welcome to the Kernel API Manual, section 9 — yeah, the kernel kernel, we're literally in the big leagues now 👑 — and today's main character is crc8, aka the tiny little checksum gremlin that runs over your data and hands you back one (1) single byte of truth. she's giving humble, she's giving essential, she's giving iykyk. 🎀

✨ NAME ✨

crc8 — calculate a crc8 over the given input data. that's it, that's the whole gig 💅

🦋 SYNOPSIS 🦋

u8 crc8 (const u8 table[CRC8_TABLE_SIZE] , const u8 *pdata , size_t
nbytes , u8 crc );

no cap, that's the exact signature, don't come for me about the line wrap, it's canon 🫶

🌸 ARGUMENTS 🌸

okay so here's the cast of characters, and every single one of them matters, so pay attention 🙈

• table — the crc table used for calculation. yes bestie, that table, the one that's CRC8_TABLE_SIZE big. you gotta bring your own, she doesn't come preloaded 🧚
• pdata — pointer to data buffer. this is the stuff you actually want crc8'd, the whole point of the operation, the moment 🌈
• nbytes — number of bytes in data buffer. like, how far does she read? exactly this far, no further 💀
• crc — previous returned crc8 value. that's right, you feed the last crc8 result back in — she's chaining, she's incremental, she's building on her own past, highkey character development 🔥

👑 SEE ALSO 👑

• Kernel file ./lib/crc/crc8.c — go read the source, bestie, it's literally right there 📖
• crc8_populate_msb(9) — the msb-flavoured table filler, obsessed ⭐
• crc8_populate_lsb(9) — and the lsb one, equally iconic, we stan both 💜

okay that's the whole page, you ate that 💅✨ and just so we're keeping it a hundred: this page lives in the kernel source tree at ./lib/crc, dated October 2026 — so like, future vibes fr fr 🦋 until next time, mwah 🫶💖