Commit 3937f6db authored by Eric Biggers's avatar Eric Biggers
Browse files

lib/crc16: unexport crc16_table and crc16_byte() 



Now that neither crc16_table nor crc16_byte() is used outside
lib/crc16.c, fold them into lib/crc16.c.

Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250513022115.39109-3-ebiggers@kernel.org


Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
parent 0769ebe2

include/linux/crc16.h

+1 −8
Original line number Diff line number Diff line
@@ -15,14 +15,7 @@ 


#include <linux/types.h>



extern u16 const crc16_table[256];



extern u16 crc16(u16 crc, const u8 *buffer, size_t len);



static inline u16 crc16_byte(u16 crc, const u8 data)

{

	return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];

}

u16 crc16(u16 crc, const u8 *p, size_t len);



#endif /* __CRC16_H */

lib/crc16.c

+4 −5
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ 
#include <linux/crc16.h>



/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */

u16 const crc16_table[256] = {

static const u16 crc16_table[256] = {

	0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,

	0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,

	0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
@@ -42,20 +42,19 @@ u16 const crc16_table[256] = { 
	0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,

	0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040

};

EXPORT_SYMBOL(crc16_table);



/**

 * crc16 - compute the CRC-16 for the data buffer

 * @crc:	previous CRC value

 * @buffer:	data pointer

 * @p:		data pointer

 * @len:	number of bytes in the buffer

 *

 * Returns the updated CRC value.

 */

u16 crc16(u16 crc, u8 const *buffer, size_t len)

u16 crc16(u16 crc, const u8 *p, size_t len)

{

	while (len--)

		crc = crc16_byte(crc, *buffer++);

		crc = (crc >> 8) ^ crc16_table[(crc & 0xff) ^ *p++];

	return crc;

}

EXPORT_SYMBOL(crc16);