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//===-- ReaderPrimitives.h - Bytecode file format reading prims -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header defines some basic functions for reading basic primitive types
// from a bytecode stream.
//
//===----------------------------------------------------------------------===//
#ifndef READERPRIMITIVES_H
#define READERPRIMITIVES_H
#include "Support/DataTypes.h"
#include <string>
namespace llvm {
static inline bool read(const unsigned char *&Buf, const unsigned char *EndBuf,
unsigned &Result) {
if (Buf+4 > EndBuf) return true;
#ifdef ENDIAN_LITTLE
Result = *(unsigned*)Buf;
#else
Result = Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24);
#endif
Buf += 4;
return false;
}
static inline bool read(const unsigned char *&Buf, const unsigned char *EndBuf,
uint64_t &Result) {
if (Buf+8 > EndBuf) return true;
#ifdef ENDIAN_LITTLE
Result = *(uint64_t*)Buf;
#else
Result = Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24) |
((uint64_t)(Buf[4] | (Buf[5] << 8) | (Buf[6] << 16) | (Buf[7] << 24)) <<32);
#endif
Buf += 8;
return false;
}
static inline bool read(const unsigned char *&Buf, const unsigned char *EndBuf,
int &Result) {
return read(Buf, EndBuf, (unsigned &)Result);
}
static inline bool read(const unsigned char *&Buf, const unsigned char *EndBuf,
int64_t &Result) {
return read(Buf, EndBuf, (uint64_t &)Result);
}
// read_vbr - Read an unsigned integer encoded in variable bitrate format.
//
static inline bool read_vbr(const unsigned char *&Buf,
const unsigned char *EndBuf, unsigned &Result) {
unsigned Shift = Result = 0;
do {
Result |= (unsigned)((*Buf++) & 0x7F) << Shift;
Shift += 7;
} while (Buf[-1] & 0x80 && Buf < EndBuf);
return Buf > EndBuf;
}
static inline bool read_vbr(const unsigned char *&Buf,
const unsigned char *EndBuf, uint64_t &Result) {
unsigned Shift = 0; Result = 0;
do {
Result |= (uint64_t)((*Buf++) & 0x7F) << Shift;
Shift += 7;
} while (Buf[-1] & 0x80 && Buf < EndBuf);
return Buf > EndBuf;
}
// read_vbr (signed) - Read a signed number stored in sign-magnitude format
static inline bool read_vbr(const unsigned char *&Buf,
const unsigned char *EndBuf, int &Result) {
unsigned R;
if (read_vbr(Buf, EndBuf, R)) return true;
if (R & 1)
Result = -(int)(R >> 1);
else
Result = (int)(R >> 1);
return false;
}
static inline bool read_vbr(const unsigned char *&Buf,
const unsigned char *EndBuf, int64_t &Result) {
uint64_t R;
if (read_vbr(Buf, EndBuf, R)) return true;
if (R & 1)
Result = -(int64_t)(R >> 1);
else
Result = (int64_t)(R >> 1);
return false;
}
// align32 - Round up to multiple of 32 bits...
static inline bool align32(const unsigned char *&Buf,
const unsigned char *EndBuf) {
Buf = (const unsigned char *)((unsigned long)(Buf+3) & (~3UL));
return Buf > EndBuf;
}
static inline bool read(const unsigned char *&Buf, const unsigned char *EndBuf,
std::string &Result, bool Aligned = true) {
unsigned Size;
if (read_vbr(Buf, EndBuf, Size)) return true; // Failure reading size?
if (Buf+Size > EndBuf) return true; // Size invalid?
Result = std::string((char*)Buf, Size);
Buf += Size;
if (Aligned) // If we should stay aligned do so...
if (align32(Buf, EndBuf)) return true; // Failure aligning?
return false;
}
static inline bool input_data(const unsigned char *&Buf,
const unsigned char *EndBuf,
void *Ptr, void *End, bool Align = false) {
unsigned char *Start = (unsigned char *)Ptr;
unsigned Amount = (unsigned char *)End - Start;
if (Buf+Amount > EndBuf) return true;
#ifdef ENDIAN_LITTLE
std::copy(Buf, Buf+Amount, Start);
Buf += Amount;
#else
unsigned char *E = (unsigned char *)End;
while (Ptr != E)
*--E = *Buf++;
#endif
if (Align) return align32(Buf, EndBuf);
return false;
}
} // End llvm namespace
#endif
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