1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
//===- CASUtil/Utils.cpp -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/CASUtil/Utils.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/CAS/CASID.h"
#include "llvm/CAS/ObjectStore.h"
#include "llvm/CASObjectFormats/Encoding.h"
#include "llvm/Support/MemoryBufferRef.h"
using namespace llvm;
using namespace llvm::cas;
using namespace llvm::casobjectformats;
using namespace llvm::casobjectformats::reader;
Expected<CASID> cas::readCASIDBuffer(cas::ObjectStore &CAS,
MemoryBufferRef Buffer) {
if (identify_magic(Buffer.getBuffer()) != file_magic::cas_id)
return createStringError(std::errc::invalid_argument,
"buffer does not contain a CASID");
StringRef Remaining =
Buffer.getBuffer().substr(StringRef(casidObjectMagicPrefix).size());
uint32_t Size;
if (auto E = encoding::consumeVBR8(Remaining, Size))
return std::move(E);
StringRef CASIDStr = Remaining.substr(0, Size);
return CAS.parseID(CASIDStr);
}
void cas::writeCASIDBuffer(const CASID &ID, llvm::raw_ostream &OS) {
OS << casidObjectMagicPrefix;
SmallString<256> CASIDStr;
raw_svector_ostream(CASIDStr) << ID;
// Write out the size of the CASID so that we can read it back properly even
// if the buffer has additional padding (e.g. after getting added in an
// archive).
SmallString<2> SizeBuf;
encoding::writeVBR8(CASIDStr.size(), SizeBuf);
OS << SizeBuf << CASIDStr;
}
|
