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crc: allow checksum calculation in blocks. (#550)

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Pablo Curiel 2021-05-20 18:07:35 -04:00 committed by GitHub
parent 4bd7863364
commit e604350e9c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 8 deletions
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28
nx/include/switch/crypto/crc.h
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@ -24,11 +24,12 @@ do { \
} \ } \
} while (0) } while (0)
/// Calculate a CRC32 over data. /// Calculate a CRC32 over data using a seed.
static inline u32 crc32Calculate(const void *src, size_t size) { /// Can be used to calculate a CRC32 in chunks using an initial seed of zero for the first chunk.
static inline u32 crc32CalculateWithSeed(u32 seed, const void *src, size_t size) {
const u8 *src_u8 = (const u8 *)src; const u8 *src_u8 = (const u8 *)src;
u32 crc = 0xFFFFFFFF; u32 crc = ~seed;
s64 len = size; s64 len = size;
_CRC_ALIGN(u8, b); _CRC_ALIGN(u8, b);
@ -44,14 +45,20 @@ static inline u32 crc32Calculate(const void *src, size_t size) {
_CRC_REMAINDER(u16, h); _CRC_REMAINDER(u16, h);
_CRC_REMAINDER(u8, b); _CRC_REMAINDER(u8, b);
return crc ^ 0xFFFFFFFF; return ~crc;
} }
/// Calculate a CRC32C over data. /// Calculate a CRC32 over data.
static inline u32 crc32cCalculate(const void *src, size_t size) { static inline u32 crc32Calculate(const void *src, size_t size) {
return crc32CalculateWithSeed(0, src, size);
}
/// Calculate a CRC32C over data using a seed.
/// Can be used to calculate a CRC32C in chunks using an initial seed of zero for the first chunk.
static inline u32 crc32cCalculateWithSeed(u32 seed, const void *src, size_t size) {
const u8 *src_u8 = (const u8 *)src; const u8 *src_u8 = (const u8 *)src;
u32 crc = 0xFFFFFFFF; u32 crc = ~seed;
s64 len = size; s64 len = size;
_CRC_ALIGN(u8, cb); _CRC_ALIGN(u8, cb);
@ -67,7 +74,12 @@ static inline u32 crc32cCalculate(const void *src, size_t size) {
_CRC_REMAINDER(u16, ch); _CRC_REMAINDER(u16, ch);
_CRC_REMAINDER(u8, cb); _CRC_REMAINDER(u8, cb);
return crc ^ 0xFFFFFFFF; return ~crc;
}
/// Calculate a CRC32C over data.
static inline u32 crc32cCalculate(const void *src, size_t size) {
return crc32cCalculateWithSeed(0, src, size);
} }
#undef _CRC_REMAINDER #undef _CRC_REMAINDER