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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Some handy functions for manipulating bits and bytes.
*
* These get inlined, so prefer small size over maximum speed.
*/
#ifndef DALVIK_BITS_H_
#define DALVIK_BITS_H_
#include "Common.h"
#include "Inlines.h"
#include <stdlib.h>
#include <string.h>
/*
* Get 1 byte. (Included to make the code more legible.)
*/
INLINE u1 get1(unsigned const char* pSrc)
{
return *pSrc;
}
/*
* Get 2 big-endian bytes.
*/
INLINE u2 get2BE(unsigned char const* pSrc)
{
return (pSrc[0] << 8) | pSrc[1];
}
/*
* Get 4 big-endian bytes.
*/
INLINE u4 get4BE(unsigned char const* pSrc)
{
return (pSrc[0] << 24) | (pSrc[1] << 16) | (pSrc[2] << 8) | pSrc[3];
}
/*
* Get 8 big-endian bytes.
*/
INLINE u8 get8BE(unsigned char const* pSrc)
{
u4 low, high;
high = pSrc[0];
high = (high << 8) | pSrc[1];
high = (high << 8) | pSrc[2];
high = (high << 8) | pSrc[3];
low = pSrc[4];
low = (low << 8) | pSrc[5];
low = (low << 8) | pSrc[6];
low = (low << 8) | pSrc[7];
return ((u8) high << 32) | (u8) low;
}
/*
* Get 2 little-endian bytes.
*/
INLINE u2 get2LE(unsigned char const* pSrc)
{
return pSrc[0] | (pSrc[1] << 8);
}
/*
* Get 4 little-endian bytes.
*/
INLINE u4 get4LE(unsigned char const* pSrc)
{
u4 result;
result = pSrc[0];
result |= pSrc[1] << 8;
result |= pSrc[2] << 16;
result |= pSrc[3] << 24;
return result;
}
/*
* Get 8 little-endian bytes.
*/
INLINE u8 get8LE(unsigned char const* pSrc)
{
u4 low, high;
low = pSrc[0];
low |= pSrc[1] << 8;
low |= pSrc[2] << 16;
low |= pSrc[3] << 24;
high = pSrc[4];
high |= pSrc[5] << 8;
high |= pSrc[6] << 16;
high |= pSrc[7] << 24;
return ((u8) high << 32) | (u8) low;
}
/*
* Grab 1 byte and advance the data pointer.
*/
INLINE u1 read1(unsigned const char** ppSrc)
{
return *(*ppSrc)++;
}
/*
* Grab 2 big-endian bytes and advance the data pointer.
*/
INLINE u2 read2BE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
*ppSrc = pSrc + 2;
return pSrc[0] << 8 | pSrc[1];
}
/*
* Grab 4 big-endian bytes and advance the data pointer.
*/
INLINE u4 read4BE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
u4 result;
result = pSrc[0] << 24;
result |= pSrc[1] << 16;
result |= pSrc[2] << 8;
result |= pSrc[3];
*ppSrc = pSrc + 4;
return result;
}
/*
* Get 8 big-endian bytes and advance the data pointer.
*/
INLINE u8 read8BE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
u4 low, high;
high = pSrc[0];
high = (high << 8) | pSrc[1];
high = (high << 8) | pSrc[2];
high = (high << 8) | pSrc[3];
low = pSrc[4];
low = (low << 8) | pSrc[5];
low = (low << 8) | pSrc[6];
low = (low << 8) | pSrc[7];
*ppSrc = pSrc + 8;
return ((u8) high << 32) | (u8) low;
}
/*
* Grab 2 little-endian bytes and advance the data pointer.
*/
INLINE u2 read2LE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
*ppSrc = pSrc + 2;
return pSrc[0] | pSrc[1] << 8;
}
/*
* Grab 4 little-endian bytes and advance the data pointer.
*/
INLINE u4 read4LE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
u4 result;
result = pSrc[0];
result |= pSrc[1] << 8;
result |= pSrc[2] << 16;
result |= pSrc[3] << 24;
*ppSrc = pSrc + 4;
return result;
}
/*
* Get 8 little-endian bytes and advance the data pointer.
*/
INLINE u8 read8LE(unsigned char const** ppSrc)
{
const unsigned char* pSrc = *ppSrc;
u4 low, high;
low = pSrc[0];
low |= pSrc[1] << 8;
low |= pSrc[2] << 16;
low |= pSrc[3] << 24;
high = pSrc[4];
high |= pSrc[5] << 8;
high |= pSrc[6] << 16;
high |= pSrc[7] << 24;
*ppSrc = pSrc + 8;
return ((u8) high << 32) | (u8) low;
}
/*
* Skip over a UTF-8 string (preceded by a 4-byte length).
*/
INLINE void skipUtf8String(unsigned char const** ppSrc)
{
u4 length = read4BE(ppSrc);
(*ppSrc) += length;
}
/*
* Read a UTF-8 string into a fixed-size buffer, and null-terminate it.
*
* Returns the length of the original string.
*/
INLINE int readUtf8String(unsigned char const** ppSrc, char* buf, size_t bufLen)
{
u4 length = read4BE(ppSrc);
size_t copyLen = (length < bufLen) ? length : bufLen-1;
memcpy(buf, *ppSrc, copyLen);
buf[copyLen] = '\0';
(*ppSrc) += length;
return length;
}
/*
* Read a UTF-8 string into newly-allocated storage, and null-terminate it.
*
* Returns the string and its length. (The latter is probably unnecessary
* for the way we're using UTF8.)
*/
INLINE char* readNewUtf8String(unsigned char const** ppSrc, size_t* pLength)
{
u4 length = read4BE(ppSrc);
char* buf;
buf = (char*) malloc(length+1);
memcpy(buf, *ppSrc, length);
buf[length] = '\0';
(*ppSrc) += length;
*pLength = length;
return buf;
}
/*
* Set 1 byte. (Included to make code more consistent/legible.)
*/
INLINE void set1(u1* buf, u1 val)
{
*buf = (u1)(val);
}
/*
* Set 2 big-endian bytes.
*/
INLINE void set2BE(u1* buf, u2 val)
{
*buf++ = (u1)(val >> 8);
*buf = (u1)(val);
}
/*
* Set 4 big-endian bytes.
*/
INLINE void set4BE(u1* buf, u4 val)
{
*buf++ = (u1)(val >> 24);
*buf++ = (u1)(val >> 16);
*buf++ = (u1)(val >> 8);
*buf = (u1)(val);
}
/*
* Set 8 big-endian bytes.
*/
INLINE void set8BE(u1* buf, u8 val)
{
*buf++ = (u1)(val >> 56);
*buf++ = (u1)(val >> 48);
*buf++ = (u1)(val >> 40);
*buf++ = (u1)(val >> 32);
*buf++ = (u1)(val >> 24);
*buf++ = (u1)(val >> 16);
*buf++ = (u1)(val >> 8);
*buf = (u1)(val);
}
/*
* Set 2 little-endian bytes.
*/
INLINE void set2LE(u1* buf, u2 val)
{
*buf++ = (u1)(val);
*buf = (u1)(val >> 8);
}
/*
* Set 4 little-endian bytes.
*/
INLINE void set4LE(u1* buf, u4 val)
{
*buf++ = (u1)(val);
*buf++ = (u1)(val >> 8);
*buf++ = (u1)(val >> 16);
*buf = (u1)(val >> 24);
}
/*
* Set 8 little-endian bytes.
*/
INLINE void set8LE(u1* buf, u8 val)
{
*buf++ = (u1)(val);
*buf++ = (u1)(val >> 8);
*buf++ = (u1)(val >> 16);
*buf++ = (u1)(val >> 24);
*buf++ = (u1)(val >> 32);
*buf++ = (u1)(val >> 40);
*buf++ = (u1)(val >> 48);
*buf = (u1)(val >> 56);
}
/*
* Stuff a UTF-8 string into the buffer.
*/
INLINE void setUtf8String(u1* buf, const u1* str)
{
u4 strLen = strlen((const char*)str);
set4BE(buf, strLen);
memcpy(buf + sizeof(u4), str, strLen);
}
#endif // DALVIK_BITS_H_