forked from 0ad/0ad
Ykkrosh
9090d25ef8
Allow aggressive inlining of MD5 buffer updates (particularly for fixed-size updates). Make UTF-8 conversion a little faster. This was SVN commit r7581.
181 lines
3.6 KiB
C++
181 lines
3.6 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* byte order (endianness) support routines.
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*/
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#include "precompiled.h"
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#include "lib/byte_order.h"
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#include "lib/bits.h"
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#ifndef swap16
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u16 swap16(const u16 x)
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{
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return (u16)(((x & 0xff) << 8) | (x >> 8));
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}
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u32 swap32(const u32 x)
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{
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return (x << 24) |
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(x >> 24) |
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((x << 8) & 0x00ff0000) |
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((x >> 8) & 0x0000ff00);
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}
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u64 swap64(const u64 x)
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{
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const u32 lo = (u32)(x & 0xFFFFFFFF);
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const u32 hi = (u32)(x >> 32);
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u64 ret = swap32(lo);
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ret <<= 32;
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// careful: must shift var of type u64, not u32
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ret |= swap32(hi);
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return ret;
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}
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#endif // #ifndef swap16
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//-----------------------------------------------------------------------------
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u16 read_le16(const void* p)
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{
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return to_le16(*(u16*)p);
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}
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u32 read_le32(const void* p)
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{
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return to_le32(*(u32*)p);
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}
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u64 read_le64(const void* p)
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{
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return to_le64(*(u64*)p);
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}
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u16 read_be16(const void* p)
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{
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return to_be16(*(u16*)p);
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}
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u32 read_be32(const void* p)
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{
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return to_be32(*(u32*)p);
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}
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u64 read_be64(const void* p)
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{
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return to_be64(*(u64*)p);
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}
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void write_le16(void* p, u16 x)
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{
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*(u16*)p = to_le16(x);
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}
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void write_le32(void* p, u32 x)
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{
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*(u32*)p = to_le32(x);
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}
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void write_le64(void* p, u64 x)
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{
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*(u64*)p = to_le64(x);
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}
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void write_be16(void* p, u16 x)
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{
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*(u16*)p = to_be16(x);
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}
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void write_be32(void* p, u32 x)
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{
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*(u32*)p = to_be32(x);
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}
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void write_be64(void* p, u64 x)
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{
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*(u64*)p = to_be64(x);
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}
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u64 movzx_le64(const u8* p, size_t size_bytes)
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{
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u64 number = 0;
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for(size_t i = 0; i < std::min(size_bytes, (size_t)8u); i++)
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number |= ((u64)p[i]) << (i*8);
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return number;
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}
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u64 movzx_be64(const u8* p, size_t size_bytes)
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{
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u64 number = 0;
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for(size_t i = 0; i < std::min(size_bytes, (size_t)8u); i++)
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{
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number <<= 8;
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number |= p[i];
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}
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return number;
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}
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static inline i64 SignExtend(u64 bits, size_t size_bytes)
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{
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// no point in sign-extending if >= 8 bytes were requested
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if(size_bytes < 8)
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{
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const u64 sign_bit = Bit<u64>((size_bytes*8)-1);
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// number would be negative in the smaller type,
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// so sign-extend, i.e. set all more significant bits.
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if(bits & sign_bit)
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{
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const u64 valid_bit_mask = (sign_bit+sign_bit)-1;
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bits |= ~valid_bit_mask;
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}
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}
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const i64 number = static_cast<i64>(bits);
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return number;
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}
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i64 movsx_le64(const u8* p, size_t size_bytes)
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{
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const u64 number = movzx_le64(p, size_bytes);
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return SignExtend(number, size_bytes);
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}
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i64 movsx_be64(const u8* p, size_t size_bytes)
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{
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const u64 number = movzx_be64(p, size_bytes);
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return SignExtend(number, size_bytes);
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}
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