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Added LFS_CRC, easier override for lfs_crc

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Now you can override littlefs's CRC implementation with some simple
defines:

  -DLFS_CRC=lfs_crc

The motivation for this is the same for LFS_MALLOC/LFS_FREE. I think
these are the main "system-level" utils that users want to override.

Don't override with this something that's not CRC32! Your filesystem
will no longer be compatible with other tools! This is only intended for
provided hardware acceleration!
This commit is contained in:
Christopher Haster
2023-12-19 14:12:10 -06:00
parent a0c6c54345
commit 9a620c730c
2 changed files with 9 additions and 0 deletions
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3
lfs_util.c
View File

@@ -11,6 +11,8 @@
#ifndef LFS_CONFIG
// If user provides their own CRC impl we don't need this
#ifndef LFS_CRC
// Software CRC implementation with small lookup table
uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size) {
static const uint32_t rtable[16] = {
@@ -29,6 +31,7 @@ uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size) {
return crc;
}
#endif
#endif

6
lfs_util.h
View File

@@ -212,7 +212,13 @@ static inline uint32_t lfs_tobe32(uint32_t a) {
}
// Calculate CRC-32 with polynomial = 0x04c11db7
#ifdef LFS_CRC
uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size) {
return LFS_CRC(crc, buffer, size)
}
#else
uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size);
#endif
// Allocate memory, only used if buffers are not provided to littlefs
// Note, memory must be 64-bit aligned