From eeb63b8901a9c049f1bb594abb9ce9b4a9c47620 Mon Sep 17 00:00:00 2001
From: Tiger Wang <ziwei.tiger@outlook.com>
Date: Mon, 11 Jan 2021 16:39:43 +0000
Subject: zlib -> libdeflate (#5085)

+ Use libdeflate
+ Use std::byte
* Fix passing temporary to string_view
+ Emulate make_unique_for_overwrite
---
 src/OSSupport/GZipFile.cpp | 96 ++++------------------------------------------
 1 file changed, 8 insertions(+), 88 deletions(-)

(limited to 'src/OSSupport/GZipFile.cpp')

diff --git a/src/OSSupport/GZipFile.cpp b/src/OSSupport/GZipFile.cpp
index e83d42583..0bf26dfed 100644
--- a/src/OSSupport/GZipFile.cpp
+++ b/src/OSSupport/GZipFile.cpp
@@ -4,107 +4,27 @@
 // Implements the cGZipFile class representing a RAII wrapper over zlib's GZip file routines
 
 #include "Globals.h"
+#include "File.h"
 #include "GZipFile.h"
 
 
 
 
 
-cGZipFile::cGZipFile(void) :
-	m_File(nullptr), m_Mode(fmRead)
+Compression::Result GZipFile::ReadRestOfFile(const std::string & a_FileName)
 {
-}
-
-
-
-
-
-cGZipFile::~cGZipFile()
-{
-	Close();
-}
-
+	InputFileStream File(a_FileName, InputFileStream::binary);
+	const std::string Input{ std::istreambuf_iterator<char>(File), std::istreambuf_iterator<char>() };
+	const ContiguousByteBufferView Data{ reinterpret_cast<const std::byte *>(Input.data()), Input.size() };
 
-
-
-
-bool cGZipFile::Open(const AString & a_FileName, eMode a_Mode)
-{
-	if (m_File != nullptr)
-	{
-		ASSERT(!"A file is already open in this object");
-		return false;
-	}
-	m_File = gzopen(a_FileName.c_str(), (a_Mode == fmRead) ? "r" : "w");
-	m_Mode = a_Mode;
-	return (m_File != nullptr);
+	return Compression::Extractor().ExtractGZip(Data);
 }
 
 
 
 
 
-void cGZipFile::Close(void)
+void GZipFile::Write(const std::string & a_FileName, ContiguousByteBufferView a_Contents)
 {
-	if (m_File != nullptr)
-	{
-		gzclose(m_File);
-		m_File = nullptr;
-	}
+	OutputFileStream(a_FileName, OutputFileStream::binary) << Compression::Compressor().CompressGZip(a_Contents).GetStringView();
 }
-
-
-
-
-
-int cGZipFile::ReadRestOfFile(AString & a_Contents)
-{
-	if (m_File == nullptr)
-	{
-		ASSERT(!"No file has been opened");
-		return -1;
-	}
-
-	if (m_Mode != fmRead)
-	{
-		ASSERT(!"Bad file mode, cannot read");
-		return -1;
-	}
-
-	// Since the gzip format doesn't really support getting the uncompressed length, we need to read incrementally. Yuck!
-	int NumBytesRead = 0;
-	int TotalBytes = 0;
-	char Buffer[64 KiB];
-	while ((NumBytesRead = gzread(m_File, Buffer, sizeof(Buffer))) > 0)
-	{
-		TotalBytes += NumBytesRead;
-		a_Contents.append(Buffer, static_cast<size_t>(NumBytesRead));
-	}
-	// NumBytesRead is < 0 on error
-	return (NumBytesRead >= 0) ? TotalBytes : NumBytesRead;
-}
-
-
-
-
-
-bool cGZipFile::Write(const char * a_Contents, int a_Size)
-{
-	if (m_File == nullptr)
-	{
-		ASSERT(!"No file has been opened");
-		return false;
-	}
-
-	if (m_Mode != fmWrite)
-	{
-		ASSERT(!"Bad file mode, cannot write");
-		return false;
-	}
-
-	return (gzwrite(m_File, a_Contents, static_cast<unsigned int>(a_Size)) != 0);
-}
-
-
-
-
-- 
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