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build: Endian compatibility

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- Detect endian instead of stopping configure on big-endian
- Add `byteswap.h` and `endian.h` header for compatibility with
  Windows and other operating systems that don't come with them
- Update `crypto/common.h` functions to use compat
  endian header
This commit is contained in:
Wladimir J. van der Laan
2014-12-19 09:53:43 +01:00
parent 51377c2dbe
commit 4414f5ffe1
5 changed files with 263 additions and 69 deletions
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76
src/crypto/common.h
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@@ -11,110 +11,56 @@
#include <stdint.h>
#if defined(HAVE_ENDIAN_H)
#include <endian.h>
#endif
#include "compat/endian.h"
uint16_t static inline ReadLE16(const unsigned char* ptr)
{
return le16toh(*((uint16_t*)ptr));
}
uint32_t static inline ReadLE32(const unsigned char* ptr)
{
#if HAVE_DECL_LE32TOH == 1
return le32toh(*((uint32_t*)ptr));
#elif !defined(WORDS_BIGENDIAN)
return *((uint32_t*)ptr);
#else
return ((uint32_t)ptr[3] << 24 | (uint32_t)ptr[2] << 16 | (uint32_t)ptr[1] << 8 | (uint32_t)ptr[0]);
#endif
}
uint64_t static inline ReadLE64(const unsigned char* ptr)
{
#if HAVE_DECL_LE64TOH == 1
return le64toh(*((uint64_t*)ptr));
#elif !defined(WORDS_BIGENDIAN)
return *((uint64_t*)ptr);
#else
return ((uint64_t)ptr[7] << 56 | (uint64_t)ptr[6] << 48 | (uint64_t)ptr[5] << 40 | (uint64_t)ptr[4] << 32 |
(uint64_t)ptr[3] << 24 | (uint64_t)ptr[2] << 16 | (uint64_t)ptr[1] << 8 | (uint64_t)ptr[0]);
#endif
}
void static inline WriteLE16(unsigned char* ptr, uint16_t x)
{
*((uint16_t*)ptr) = htole16(x);
}
void static inline WriteLE32(unsigned char* ptr, uint32_t x)
{
#if HAVE_DECL_HTOLE32 == 1
*((uint32_t*)ptr) = htole32(x);
#elif !defined(WORDS_BIGENDIAN)
*((uint32_t*)ptr) = x;
#else
ptr[3] = x >> 24;
ptr[2] = x >> 16;
ptr[1] = x >> 8;
ptr[0] = x;
#endif
}
void static inline WriteLE64(unsigned char* ptr, uint64_t x)
{
#if HAVE_DECL_HTOLE64 == 1
*((uint64_t*)ptr) = htole64(x);
#elif !defined(WORDS_BIGENDIAN)
*((uint64_t*)ptr) = x;
#else
ptr[7] = x >> 56;
ptr[6] = x >> 48;
ptr[5] = x >> 40;
ptr[4] = x >> 32;
ptr[3] = x >> 24;
ptr[2] = x >> 16;
ptr[1] = x >> 8;
ptr[0] = x;
#endif
}
uint32_t static inline ReadBE32(const unsigned char* ptr)
{
#if HAVE_DECL_BE32TOH == 1
return be32toh(*((uint32_t*)ptr));
#else
return ((uint32_t)ptr[0] << 24 | (uint32_t)ptr[1] << 16 | (uint32_t)ptr[2] << 8 | (uint32_t)ptr[3]);
#endif
}
uint64_t static inline ReadBE64(const unsigned char* ptr)
{
#if HAVE_DECL_BE64TOH == 1
return be64toh(*((uint64_t*)ptr));
#else
return ((uint64_t)ptr[0] << 56 | (uint64_t)ptr[1] << 48 | (uint64_t)ptr[2] << 40 | (uint64_t)ptr[3] << 32 |
(uint64_t)ptr[4] << 24 | (uint64_t)ptr[5] << 16 | (uint64_t)ptr[6] << 8 | (uint64_t)ptr[7]);
#endif
}
void static inline WriteBE32(unsigned char* ptr, uint32_t x)
{
#if HAVE_DECL_HTOBE32 == 1
*((uint32_t*)ptr) = htobe32(x);
#else
ptr[0] = x >> 24;
ptr[1] = x >> 16;
ptr[2] = x >> 8;
ptr[3] = x;
#endif
}
void static inline WriteBE64(unsigned char* ptr, uint64_t x)
{
#if HAVE_DECL_HTOBE64 == 1
*((uint64_t*)ptr) = htobe64(x);
#else
ptr[0] = x >> 56;
ptr[1] = x >> 48;
ptr[2] = x >> 40;
ptr[3] = x >> 32;
ptr[4] = x >> 24;
ptr[5] = x >> 16;
ptr[6] = x >> 8;
ptr[7] = x;
#endif
}
#endif // BITCOIN_CRYPTO_COMMON_H