59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
// File: lzham_utils.h
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// See Copyright Notice and license at the end of include/lzham.h
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#pragma once
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#define LZHAM_GET_ALIGNMENT(v) ((!sizeof(v)) ? 1 : (__alignof(v) ? __alignof(v) : sizeof(uint32)))
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#define LZHAM_MIN(a, b) (((a) < (b)) ? (a) : (b))
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#define LZHAM_MAX(a, b) (((a) < (b)) ? (b) : (a))
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template<class T, size_t N> T decay_array_to_subtype(T (&a)[N]);
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#define LZHAM_ARRAY_SIZE(X) (sizeof(X) / sizeof(decay_array_to_subtype(X)))
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namespace lzham
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{
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namespace utils
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{
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template<typename T> inline void swap(T& l, T& r)
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{
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T temp(l);
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l = r;
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r = temp;
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}
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template<typename T> inline void zero_object(T& obj)
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{
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memset(&obj, 0, sizeof(obj));
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}
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static inline uint32 swap32(uint32 x) { return ((x << 24U) | ((x << 8U) & 0x00FF0000U) | ((x >> 8U) & 0x0000FF00U) | (x >> 24U)); }
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inline uint count_leading_zeros16(uint v)
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{
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LZHAM_ASSERT(v < 0x10000);
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uint temp;
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uint n = 16;
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temp = v >> 8;
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if (temp) { n -= 8; v = temp; }
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temp = v >> 4;
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if (temp) { n -= 4; v = temp; }
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temp = v >> 2;
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if (temp) { n -= 2; v = temp; }
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temp = v >> 1;
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if (temp) { n -= 1; v = temp; }
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if (v & 1) n--;
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return n;
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}
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} // namespace utils
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} // namespace lzham
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