libpldm: utils: Add crc8 implementation
Add crc8 implementation
Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Icfa5e9815098783932d9234c71e6592127fd8273
diff --git a/libpldm/utils.c b/libpldm/utils.c
index cd67a47..9c701cb 100644
--- a/libpldm/utils.c
+++ b/libpldm/utils.c
@@ -54,6 +54,32 @@
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};
+/* 0x07(polynomial: x8+x2+x1+1)
+ */
+static const uint8_t crc8_table[] = {
+ 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31,
+ 0x24, 0x23, 0x2a, 0x2d, 0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
+ 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d, 0xe0, 0xe7, 0xee, 0xe9,
+ 0xfc, 0xfb, 0xf2, 0xf5, 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
+ 0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1,
+ 0xb4, 0xb3, 0xba, 0xbd, 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
+ 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, 0xb7, 0xb0, 0xb9, 0xbe,
+ 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
+ 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, 0x1f, 0x18, 0x11, 0x16,
+ 0x03, 0x04, 0x0d, 0x0a, 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
+ 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, 0x89, 0x8e, 0x87, 0x80,
+ 0x95, 0x92, 0x9b, 0x9c, 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
+ 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8,
+ 0xdd, 0xda, 0xd3, 0xd4, 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
+ 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, 0x19, 0x1e, 0x17, 0x10,
+ 0x05, 0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
+ 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78, 0x7f,
+ 0x6a, 0x6d, 0x64, 0x63, 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
+ 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, 0xae, 0xa9, 0xa0, 0xa7,
+ 0xb2, 0xb5, 0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
+ 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 0xe6, 0xe1, 0xe8, 0xef,
+ 0xfa, 0xfd, 0xf4, 0xf3};
+
uint32_t crc32(const void *data, size_t size)
{
const uint8_t *p = data;
@@ -63,6 +89,15 @@
return crc ^ ~0U;
}
+uint8_t crc8(const void *data, size_t size)
+{
+ const uint8_t *p = data;
+ uint8_t crc = 0x00;
+ while (size--)
+ crc = crc8_table[crc ^ *p++];
+ return crc;
+}
+
static int print_version_field(uint8_t bcd, char *buffer, size_t buffer_size)
{
int v;
diff --git a/libpldm/utils.h b/libpldm/utils.h
index 133fb4c..df5b62a 100644
--- a/libpldm/utils.h
+++ b/libpldm/utils.h
@@ -9,6 +9,15 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
+
+/** @brief Compute Crc8(same as the one used by SMBUS)
+ *
+ * @param[in] data - Pointer to the target data
+ * @param[in] size - Size of the data
+ * @return The checksum
+ */
+uint8_t crc8(const void *data, size_t size);
+
/** @brief Compute Crc32(same as the one used by IEEE802.3)
*
* @param[in] data - Pointer to the target data
diff --git a/test/libpldm_utils_test.cpp b/test/libpldm_utils_test.cpp
index a40aec1..990a62b 100644
--- a/test/libpldm_utils_test.cpp
+++ b/test/libpldm_utils_test.cpp
@@ -12,6 +12,13 @@
EXPECT_EQ(checksum, 0xcbf43926);
}
+TEST(Crc8, CheckSumTest)
+{
+ const char* data = "123456789";
+ auto checksum = crc8(data, 9);
+ EXPECT_EQ(checksum, 0xf4);
+}
+
TEST(Ver2string, Ver2string)
{
ver32_t version{0xf3, 0xf7, 0x10, 0x61};