104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
// Copyright (c) 2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_CRYPTO_COMMON_H
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#define BITCOIN_CRYPTO_COMMON_H
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#if defined(HAVE_CONFIG_H)
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#include "bitcoin-config.h"
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#endif
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#include <stdint.h>
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#include <string.h>
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#include "compat/endian.h"
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uint16_t static inline ReadLE16(const unsigned char* ptr)
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{
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uint16_t x;
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memcpy((char*)&x, ptr, 2);
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return le16toh(x);
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}
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uint32_t static inline ReadLE32(const unsigned char* ptr)
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{
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uint32_t x;
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memcpy((char*)&x, ptr, 4);
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return le32toh(x);
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}
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uint64_t static inline ReadLE64(const unsigned char* ptr)
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{
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uint64_t x;
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memcpy((char*)&x, ptr, 8);
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return le64toh(x);
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}
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void static inline WriteLE16(unsigned char* ptr, uint16_t x)
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{
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uint16_t v = htole16(x);
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memcpy(ptr, (char*)&v, 2);
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}
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void static inline WriteLE32(unsigned char* ptr, uint32_t x)
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{
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uint32_t v = htole32(x);
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memcpy(ptr, (char*)&v, 4);
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}
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void static inline WriteLE64(unsigned char* ptr, uint64_t x)
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{
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uint64_t v = htole64(x);
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memcpy(ptr, (char*)&v, 8);
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}
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uint32_t static inline ReadBE32(const unsigned char* ptr)
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{
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uint32_t x;
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memcpy((char*)&x, ptr, 4);
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return be32toh(x);
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}
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uint64_t static inline ReadBE64(const unsigned char* ptr)
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{
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uint64_t x;
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memcpy((char*)&x, ptr, 8);
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return be64toh(x);
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}
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void static inline WriteBE32(unsigned char* ptr, uint32_t x)
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{
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uint32_t v = htobe32(x);
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memcpy(ptr, (char*)&v, 4);
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}
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void static inline WriteBE64(unsigned char* ptr, uint64_t x)
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{
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uint64_t v = htobe64(x);
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memcpy(ptr, (char*)&v, 8);
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}
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/** Return the smallest number n such that (x >> n) == 0 (or 64 if the highest bit in x is set. */
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uint64_t static inline CountBits(uint64_t x)
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{
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#ifdef HAVE_DECL___BUILTIN_CLZL
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if (sizeof(unsigned long) >= sizeof(uint64_t)) {
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return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0;
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}
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#endif
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#ifdef HAVE_DECL___BUILTIN_CLZLL
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if (sizeof(unsigned long long) >= sizeof(uint64_t)) {
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return x ? 8 * sizeof(unsigned long long) - __builtin_clzll(x) : 0;
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}
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#endif
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int ret = 0;
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while (x) {
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x >>= 1;
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++ret;
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}
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return ret;
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}
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#endif // BITCOIN_CRYPTO_COMMON_H
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