mirror of https://github.com/bsnes-emu/bsnes.git
134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
#pragma once
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#include <nall/algorithm.hpp>
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#include <nall/stdint.hpp>
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namespace nall { namespace memory {
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inline auto allocate(uint size) -> void*;
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inline auto allocate(uint size, uint8_t data) -> void*;
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inline auto resize(void* target, uint size) -> void*;
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inline auto free(void* target) -> void;
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inline auto compare(const void* target, uint capacity, const void* source, uint size) -> int;
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inline auto compare(const void* target, const void* source, uint size) -> int;
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inline auto icompare(const void* target, uint capacity, const void* source, uint size) -> int;
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inline auto icompare(const void* target, const void* source, uint size) -> int;
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inline auto copy(void* target, uint capacity, const void* source, uint size) -> void*;
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inline auto copy(void* target, const void* source, uint size) -> void*;
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inline auto move(void* target, uint capacity, const void* source, uint size) -> void*;
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inline auto move(void* target, const void* source, uint size) -> void*;
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inline auto fill(void* target, uint capacity, uint8_t data = 0x00) -> void*;
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template<typename T> inline auto assign(T* target) -> void {}
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template<typename T, typename U, typename... P> inline auto assign(T* target, const U& value, P&&... p) -> void;
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}}
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namespace nall {
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//implementation notes:
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//memcmp, memcpy, memmove have terrible performance on small block sizes (FreeBSD 10.0-amd64)
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//as this library is used extensively by nall/string, and most strings tend to be small,
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//this library hand-codes these functions instead. surprisingly, it's a substantial speedup
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auto memory::allocate(uint size) -> void* {
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return malloc(size);
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}
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auto memory::allocate(uint size, uint8_t data) -> void* {
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auto result = malloc(size);
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if(result) fill(result, size, data);
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return result;
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}
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auto memory::resize(void* target, uint size) -> void* {
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return realloc(target, size);
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}
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auto memory::free(void* target) -> void {
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::free(target);
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}
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auto memory::compare(const void* target, uint capacity, const void* source, uint size) -> int {
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auto t = (int8_t*)target;
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auto s = (int8_t*)source;
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auto l = min(capacity, size);
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while(l--) {
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auto x = *t++;
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auto y = *s++;
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if(x != y) return x - y;
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}
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return 0;
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}
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auto memory::compare(const void* target, const void* source, uint size) -> int {
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return compare(target, size, source, size);
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}
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auto memory::icompare(const void* target, uint capacity, const void* source, uint size) -> int {
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auto t = (int8_t*)target;
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auto s = (int8_t*)source;
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auto l = min(capacity, size);
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while(l--) {
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auto x = *t++;
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auto y = *s++;
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if(x - 'A' < 26) x += 32;
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if(y - 'A' < 26) y += 32;
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if(x != y) return x - y;
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}
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return 0;
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}
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auto memory::icompare(const void* target, const void* source, uint size) -> int {
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return icompare(target, size, source, size);
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}
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auto memory::copy(void* target, uint capacity, const void* source, uint size) -> void* {
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auto t = (uint8_t*)target;
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auto s = (uint8_t*)source;
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auto l = min(capacity, size);
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while(l--) *t++ = *s++;
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return target;
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}
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auto memory::copy(void* target, const void* source, uint size) -> void* {
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return copy(target, size, source, size);
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}
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auto memory::move(void* target, uint capacity, const void* source, uint size) -> void* {
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auto t = (uint8_t*)target;
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auto s = (uint8_t*)source;
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auto l = min(capacity, size);
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if(t < s) {
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while(l--) *t++ = *s++;
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} else {
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t += l;
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s += l;
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while(l--) *--t = *--s;
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}
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return target;
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}
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auto memory::move(void* target, const void* source, uint size) -> void* {
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return move(target, size, source, size);
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}
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auto memory::fill(void* target, uint capacity, uint8_t data) -> void* {
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auto t = (uint8_t*)target;
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while(capacity--) *t++ = data;
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return target;
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}
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template<typename T, typename U, typename... P>
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auto memory::assign(T* target, const U& value, P&&... p) -> void {
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*target++ = value;
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assign(target, forward<P>(p)...);
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}
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}
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