lib/ObjectYAML/YAML.cpp

   1 //===- YAML.cpp - YAMLIO utilities for object files -----------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines utility classes for handling the YAML representation of
  11 // object files.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/ObjectYAML/YAML.h"
  16 #include "llvm/ADT/StringExtras.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include <cctype>
  19 #include <cstdint>
  20
  21 using namespace llvm;
  22
  23 void yaml::ScalarTraits<yaml::BinaryRef>::output(
  24     const yaml::BinaryRef &Val, void *, raw_ostream &Out) {
  25   Val.writeAsHex(Out);
  26 }
  27
  28 StringRef yaml::ScalarTraits<yaml::BinaryRef>::input(StringRef Scalar, void *,
  29                                                      yaml::BinaryRef &Val) {
  30   if (Scalar.size() % 2 != 0)
  31     return "BinaryRef hex string must contain an even number of nybbles.";
  32   // TODO: Can we improve YAMLIO to permit a more accurate diagnostic here?
  33   // (e.g. a caret pointing to the offending character).
  34   for (unsigned I = 0, N = Scalar.size(); I != N; ++I)
  35     if (!isxdigit(Scalar[I]))
  36       return "BinaryRef hex string must contain only hex digits.";
  37   Val = yaml::BinaryRef(Scalar);
  38   return {};
  39 }
  40
  41 void yaml::BinaryRef::writeAsBinary(raw_ostream &OS) const {
  42   if (!DataIsHexString) {
  43     OS.write((const char *)Data.data(), Data.size());
  44     return;
  45   }
  46   for (unsigned I = 0, N = Data.size(); I != N; I += 2) {
  47     uint8_t Byte;
  48     StringRef((const char *)&Data[I],  2).getAsInteger(16, Byte);
  49     OS.write(Byte);
  50   }
  51 }
  52
  53 void yaml::BinaryRef::writeAsHex(raw_ostream &OS) const {
  54   if (binary_size() == 0)
  55     return;
  56   if (DataIsHexString) {
  57     OS.write((const char *)Data.data(), Data.size());
  58     return;
  59   }
  60   for (uint8_t Byte : Data)
  61     OS << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf);
  62 }