Revert r296215, "[PDB] General improvements to Stream library." and followings.

r296215, "[PDB] General improvements to Stream library."
r296217, "Disable BinaryStreamTest.StreamReaderObject temporarily."
r296220, "Re-enable BinaryStreamTest.StreamReaderObject."
r296244, "[PDB] Disable some tests that are breaking bots."
r296249, "Add static_cast to silence -Wc++11-narrowing."

std::errc::no_buffer_space should be used for OS-oriented errors for socket transmission.
(Seek discussions around llvm/xray.)

I could substitute s/no_buffer_space/others/g, but I revert whole them ATM.

Could we define and use LLVM errors there?

llvm-svn: 296258
diff --git a/llvm/lib/DebugInfo/PDB/Native/DbiStream.cpp b/llvm/lib/DebugInfo/PDB/Native/DbiStream.cpp
index 51a868f..d816943 100644
--- a/llvm/lib/DebugInfo/PDB/Native/DbiStream.cpp
+++ b/llvm/lib/DebugInfo/PDB/Native/DbiStream.cpp
@@ -10,8 +10,6 @@
 #include "llvm/DebugInfo/PDB/Native/DbiStream.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/DebugInfo/MSF/BinaryStreamArray.h"
-#include "llvm/DebugInfo/MSF/BinaryStreamArray.h"
-#include "llvm/DebugInfo/MSF/BinaryStreamReader.h"
 #include "llvm/DebugInfo/MSF/BinaryStreamReader.h"
 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
 #include "llvm/DebugInfo/PDB/Native/ISectionContribVisitor.h"
@@ -36,7 +34,7 @@
 
 template <typename ContribType>
 static Error loadSectionContribs(FixedStreamArray<ContribType> &Output,
-                                 BinaryStreamReader &Reader) {
+                                 StreamReader &Reader) {
   if (Reader.bytesRemaining() % sizeof(ContribType) != 0)
     return make_error<RawError>(
         raw_error_code::corrupt_file,
@@ -54,7 +52,7 @@
 DbiStream::~DbiStream() = default;
 
 Error DbiStream::reload() {
-  BinaryStreamReader Reader(*Stream);
+  StreamReader Reader(*Stream);
 
   if (Stream->getLength() < sizeof(DbiStreamHeader))
     return make_error<RawError>(raw_error_code::corrupt_file,
@@ -147,7 +145,7 @@
                                 "Found unexpected bytes in DBI Stream.");
 
   if (ECSubstream.getLength() > 0) {
-    BinaryStreamReader ECReader(ECSubstream);
+    StreamReader ECReader(ECSubstream);
     if (auto EC = ECNames.load(ECReader))
       return EC;
   }
@@ -209,16 +207,16 @@
   return static_cast<PDB_Machine>(Machine);
 }
 
-FixedStreamArray<object::coff_section> DbiStream::getSectionHeaders() {
+msf::FixedStreamArray<object::coff_section> DbiStream::getSectionHeaders() {
   return SectionHeaders;
 }
 
-FixedStreamArray<object::FpoData> DbiStream::getFpoRecords() {
+msf::FixedStreamArray<object::FpoData> DbiStream::getFpoRecords() {
   return FpoRecords;
 }
 
 ArrayRef<ModuleInfoEx> DbiStream::modules() const { return ModuleInfos; }
-FixedStreamArray<SecMapEntry> DbiStream::getSectionMap() const {
+msf::FixedStreamArray<SecMapEntry> DbiStream::getSectionMap() const {
   return SectionMap;
 }
 
@@ -237,8 +235,8 @@
   if (SecContrSubstream.getLength() == 0)
     return Error::success();
 
-  BinaryStreamReader SCReader(SecContrSubstream);
-  if (auto EC = SCReader.readEnum(SectionContribVersion))
+  StreamReader SCReader(SecContrSubstream);
+  if (auto EC = SCReader.readEnum(SectionContribVersion, llvm::support::little))
     return EC;
 
   if (SectionContribVersion == DbiSecContribVer60)
@@ -256,7 +254,7 @@
 
   // Since each ModInfo in the stream is a variable length, we have to iterate
   // them to know how many there actually are.
-  BinaryStreamReader Reader(ModInfoSubstream);
+  StreamReader Reader(ModInfoSubstream);
 
   VarStreamArray<ModInfo> ModInfoArray;
   if (auto EC = Reader.readArray(ModInfoArray, ModInfoSubstream.getLength()))
@@ -286,7 +284,7 @@
                                 "Corrupted section header stream.");
 
   size_t NumSections = StreamLen / sizeof(object::coff_section);
-  BinaryStreamReader Reader(*SHS);
+  msf::StreamReader Reader(*SHS);
   if (auto EC = Reader.readArray(SectionHeaders, NumSections))
     return make_error<RawError>(raw_error_code::corrupt_file,
                                 "Could not read a bitmap.");
@@ -318,7 +316,7 @@
                                 "Corrupted New FPO stream.");
 
   size_t NumRecords = StreamLen / sizeof(object::FpoData);
-  BinaryStreamReader Reader(*FS);
+  msf::StreamReader Reader(*FS);
   if (auto EC = Reader.readArray(FpoRecords, NumRecords))
     return make_error<RawError>(raw_error_code::corrupt_file,
                                 "Corrupted New FPO stream.");
@@ -330,7 +328,7 @@
   if (SecMapSubstream.getLength() == 0)
     return Error::success();
 
-  BinaryStreamReader SMReader(SecMapSubstream);
+  StreamReader SMReader(SecMapSubstream);
   const SecMapHeader *Header;
   if (auto EC = SMReader.readObject(Header))
     return EC;
@@ -344,7 +342,7 @@
     return Error::success();
 
   const FileInfoSubstreamHeader *FH;
-  BinaryStreamReader FISR(FileInfoSubstream);
+  StreamReader FISR(FileInfoSubstream);
   if (auto EC = FISR.readObject(FH))
     return EC;
 
@@ -413,14 +411,14 @@
 }
 
 Expected<StringRef> DbiStream::getFileNameForIndex(uint32_t Index) const {
-  BinaryStreamReader Names(NamesBuffer);
+  StreamReader Names(NamesBuffer);
   if (Index >= FileNameOffsets.size())
     return make_error<RawError>(raw_error_code::index_out_of_bounds);
 
   uint32_t FileOffset = FileNameOffsets[Index];
   Names.setOffset(FileOffset);
   StringRef Name;
-  if (auto EC = Names.readCString(Name))
+  if (auto EC = Names.readZeroString(Name))
     return std::move(EC);
   return Name;
 }