Task 45629821: Add support for GZIP Compression (#774)

* Initial changes

* Fix unknown override specifier errors

* GZIP Integration with Win32 and GDK

* Adding support for 2019

* Restoring Win32 Sample app

* Removing unnecessary include

* Excluding ZLib on props files

* Managing ZLib source compilation in props files

* Fixing variable redeclaration

* Addressing PR Feedback Pt1

* Pointing to v1.3 commit

* Addressing PR Feedback pt2

* Enabling compression through read body callback

* Addressing PR Feedback

* Minor changes

* Addressing PR Feedback

* Removing extra buffer in compress function

* Minor mistake in compression header

* Removing unnecessary buffer when reading body

* Moving compression from Common to HTTP

* Removing loop and reading whole body at once

---------

Co-authored-by: Raul Gomez Rodriguez <raulalbertog@microsoft.com>

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "External/curl"]
 	path = External/curl
 	url = https://github.com/curl/curl.git
+[submodule "External/zlib"]
+	path = External/zlib
+	url = https://github.com/madler/zlib

Build/libHttpClient.142.GDK.C/libHttpClient.142.GDK.C.vcxproj

@@ -9,5 +9,6 @@
   <Import Project="$(HCRoot)\libHttpClient.props" />
   <Import Project="$(HCBuildRoot)\libHttpClient.Common\libHttpClient.Common.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.GDK\libHttpClient.GDK.vcxitems" Label="Shared" />
+  <Import Condition="'$(HCNoZlib)' != 'true'" Project="$(HCBuildRoot)\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems" Label="Shared" />
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 </Project>

Build/libHttpClient.142.Win32.C/libHttpClient.142.Win32.C.vcxproj

@@ -10,5 +10,6 @@
   <Import Project="$(HCBuildRoot)\libHttpClient.Common\libHttpClient.Common.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.Win32\libHttpClient.Win32.vcxitems" Label="Shared" />
+  <Import Condition="'$(HCNoZlib)' != 'true'" Project="$(HCBuildRoot)\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems" Label="Shared" />
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 </Project>

Build/libHttpClient.143.GDK.C/libHttpClient.143.GDK.C.vcxproj

@@ -9,5 +9,6 @@
   <Import Project="$(HCRoot)\libHttpClient.props" />
   <Import Project="$(HCBuildRoot)\libHttpClient.Common\libHttpClient.Common.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.GDK\libHttpClient.GDK.vcxitems" Label="Shared" />
+  <Import Condition="'$(HCNoZlib)' != 'true'" Project="$(HCBuildRoot)\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems" Label="Shared" />
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 </Project>

Build/libHttpClient.143.Win32.C/libHttpClient.143.Win32.C.vcxproj

@@ -5,10 +5,11 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
-  <Import Project="$([MSBuild]::GetPathOfFileAbove(libHttpClient.Win32.props))" /> 
+  <Import Project="$([MSBuild]::GetPathOfFileAbove(libHttpClient.Win32.props))" />
   <Import Project="$(HCRoot)\libHttpClient.props"/>
   <Import Project="$(HCBuildRoot)\libHttpClient.Common\libHttpClient.Common.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems" Label="Shared" />
   <Import Project="$(HCBuildRoot)\libHttpClient.Win32\libHttpClient.Win32.vcxitems" Label="Shared" />
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" /> 
+  <Import Condition="'$(HCNoZlib)' != 'true'" Project="$(HCBuildRoot)\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems" Label="Shared" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 </Project>

Build/libHttpClient.Common/libHttpClient.Common.vcxitems

@@ -14,6 +14,11 @@
   <ItemGroup>
     <ProjectCapability Include="SourceItemsFromImports" />
   </ItemGroup>
+  <ItemDefinitionGroup Condition="'$(HCNoZlib)'=='true'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);HC_NOZLIB</PreprocessorDefinitions>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Include\httpClient\async.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Include\httpClient\config.h" />
@@ -35,6 +40,7 @@
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Global\global.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Global\mem.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Global\NetworkState.h" />
+    <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\compression.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\httpcall.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Logger\trace_internal.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Mock\lhc_mock.h" />
@@ -56,6 +62,7 @@
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\Global\global_publics.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\Global\mem.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\Global\NetworkState.cpp" />
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\compression.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\httpcall.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\httpcall_publics.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\httpcall_request.cpp" />

Build/libHttpClient.Common/libHttpClient.Common.vcxitems.filters

@@ -123,6 +123,9 @@
     <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\Global\NetworkState.h">
       <Filter>Source\Global</Filter>
     </ClInclude>
+    <ClInclude Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\compression.h">
+      <Filter>Source\HTTP</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\Common\pch.cpp">
@@ -185,5 +188,8 @@
     <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\Global\NetworkState.cpp">
       <Filter>Source\Global</Filter>
     </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\Source\HTTP\compression.cpp">
+      <Filter>Source\HTTP</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>

Build/libHttpClient.UnitTest.TAEF/libHttpClient.UnitTest.TAEF.vcxproj

@@ -17,7 +17,7 @@
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       <WarningLevel>Level3</WarningLevel>
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+      <PreprocessorDefinitions>USING_TAEF;DASHBOARD_PRINCIPLE_GROUP;_NO_ASYNCRTIMP;INLINE_TEST_METHOD_MARKUP;WINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP;UNIT_TEST_SERVICES;HC_NOZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <CompileAsWinRT>true</CompileAsWinRT>
       <AdditionalUsingDirectories>$(WindowsSdkDir_10)UnionMetadata;$(VCToolsInstallDir)lib\x86\store\references;%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <AdditionalOptions>/GS %(AdditionalOptions)</AdditionalOptions>

Build/libHttpClient.UnitTest.TE/libHttpClient.UnitTest.TE.vcxproj

@@ -18,7 +18,7 @@
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       <WarningLevel>Level3</WarningLevel>
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+      <PreprocessorDefinitions>DASHBOARD_PRINCIPLE_GROUP;_NO_ASYNCRTIMP;UNITTEST_TE;INLINE_TEST_METHOD_MARKUP;WINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP;UNIT_TEST_SERVICES;HC_NOZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalUsingDirectories>C:\Program Files (x86)\Windows Kits\10\UnionMetadata;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\lib\store\references;C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\VC\vcpackages;%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <AdditionalIncludeDirectories>$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <CompileAsWinRT>true</CompileAsWinRT>

Build/libHttpClient.Zlib/libHttpClient.Zlib.vcxitems

@@ -0,0 +1,595 @@
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+    <HasSharedItems>true</HasSharedItems>
+    <ItemsProjectGuid>{f9061dca-255b-4d5e-8df5-4afbfb4b98ef}</ItemsProjectGuid>
+    <zlibInclude>$(HCRoot)\External\zlib\</zlibInclude>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>%(AdditionalIncludeDirectories);$(MSBuildThisFileDirectory);$(zlibInclude)</AdditionalIncludeDirectories>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ProjectCapability Include="SourceItemsFromImports" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\adler32.c">
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Build/libHttpClient.Zlib/libHttpClient.Zlib.vcxitems.filters

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source">
+      <UniqueIdentifier>{209de8ce-83e2-4899-9eab-7ca4de9d9d8e}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\adler32.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\compress.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\crc32.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\deflate.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\gzclose.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\gzlib.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\gzread.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\gzwrite.c">
+      <Filter>Source</Filter>
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+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\inffast.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\inflate.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\inftrees.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\trees.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\uncompr.c">
+      <Filter>Source</Filter>
+    </ClCompile>
+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\contrib\minizip\ioapi.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\contrib\minizip\iowin32.c">
+      <Filter>Source</Filter>
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+    <ClCompile Include="$(MSBuildThisFileDirectory)..\..\External\zlib\contrib\minizip\unzip.c">
+      <Filter>Source</Filter>
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+      <Filter>Source</Filter>
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External/zlib

@@ -0,0 +1 @@
+Subproject commit 09155eaa2f9270dc4ed1fa13e2b4b2613e6e4851

Include/httpClient/httpClient.h

@@ -380,6 +380,51 @@ STDAPI HCHttpCallRequestSetRequestBodyString(
     _In_z_ const char* requestBodyString
     ) noexcept;
 
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+
+/// <summary>
+/// Defines the compression level that will be used on the compression algorithm.
+/// Lower levels perform less compression but have the highest speed in the compression and
+/// higher levels perform better compression but have the slowest speed in the compression.
+/// </summary>
+enum class HCCompressionLevel : uint32_t
+{
+    /// <summary>
+    /// A value of "None" indicates that no compression will be made.
+    /// </summary>
+    None = 0,
+
+    /// <summary>
+    /// A value of "Low" indicates that compression level 1 will be made.
+    /// </summary>
+    Low = 1,
+
+    /// <summary>
+    /// A value of "Medium" indicates that compression level 6 will be made.
+    /// </summary>
+    Medium = 6,
+
+    /// <summary>
+    /// A value of "High" indicates that compression level 9 will be made.
+    /// </summary>
+    High = 9
+};
+
+/// <summary>
+/// Enable GZIP compression on the provided body payload.
+/// </summary>
+/// <param name="call">The handle of the HTTP call.</param>
+/// <param name="level">The desired compression level.</param>
+/// <returns>Result code for this API operation.  Possible values are S_OK, E_INVALIDARG, E_OUTOFMEMORY, or E_FAIL.</returns>
+/// <remarks>This must be called prior to calling HCHttpCallPerformAsync.</remarks>
+STDAPI HCHttpCallRequestEnableGzipCompression(
+    _In_ HCCallHandle call,
+    _In_ HCCompressionLevel level
+) noexcept;
+#endif
+#endif  // !HC_NOZLIB
+
 /// <summary>
 /// The callback definition used by an HTTP call to read the request body. This callback will be invoked
 /// on an unspecified background thread which is platform dependent.

Include/httpClient/pal.h

@@ -451,6 +451,7 @@ typedef struct _LIST_ENTRY {
 #define E_HC_NO_NETWORK                 MAKE_E_HC(0x5006) // 0x89235006
 #define E_HC_NETWORK_NOT_INITIALIZED    MAKE_E_HC(0x5007) // 0x89235007
 #define E_HC_INTERNAL_STILLINUSE        MAKE_E_HC(0x5008) // 0x89235008
+#define E_HC_COMPRESSION_ENABLED        MAKE_E_HC(0x5009) // 0x89235009
 
 typedef uint32_t HCMemoryType;
 typedef struct HC_WEBSOCKET_OBSERVER* HCWebsocketHandle;

Samples/Win32-Http/main.cpp

@@ -178,7 +178,7 @@ struct SampleHttpCallAsyncContext
     std::string filePath;
 };
 
-void DoHttpCall(std::string url, std::string requestBody, bool isJson, std::string filePath)
+void DoHttpCall(std::string url, std::string requestBody, bool isJson, std::string filePath, bool enableGzipCompression)
 {
     std::string method = "GET";
     bool retryAllowed = true;
@@ -188,6 +188,7 @@ void DoHttpCall(std::string url, std::string requestBody, bool isJson, std::stri
     header.clear();
     header.push_back("TestHeader");
     header.push_back("1.0");
+
     headers.push_back(header);
 
     HCCallHandle call = nullptr;
@@ -195,6 +196,12 @@ void DoHttpCall(std::string url, std::string requestBody, bool isJson, std::stri
     HCHttpCallRequestSetUrl(call, method.c_str(), url.c_str());
     HCHttpCallRequestSetRequestBodyString(call, requestBody.c_str());
     HCHttpCallRequestSetRetryAllowed(call, retryAllowed);
+
+    if (enableGzipCompression)
+    {
+        HCHttpCallRequestEnableGzipCompression(call, HCCompressionLevel::Medium);
+    }
+
     for (auto& header : headers)
     {
         std::string headerName = header[0];
@@ -305,10 +312,11 @@ int main()
     StartBackgroundThread();
 
     std::string url1 = "https://raw.githubusercontent.com/Microsoft/libHttpClient/master/Samples/Win32-Http/TestContent.json";
-    DoHttpCall(url1, "{\"test\":\"value\"},{\"test2\":\"value\"},{\"test3\":\"value\"},{\"test4\":\"value\"},{\"test5\":\"value\"},{\"test6\":\"value\"},{\"test7\":\"value\"}", true, "");
+    DoHttpCall(url1, "{\"test\":\"value\"},{\"test2\":\"value\"},{\"test3\":\"value\"},{\"test4\":\"value\"},{\"test5\":\"value\"},{\"test6\":\"value\"},{\"test7\":\"value\"}", true, "", false);
+    DoHttpCall(url1, "{\"test\":\"value\"},{\"test2\":\"value\"},{\"test3\":\"value\"},{\"test4\":\"value\"},{\"test5\":\"value\"},{\"test6\":\"value\"},{\"test7\":\"value\"}", true, "", true);
 
     std::string url2 = "https://github.com/Microsoft/libHttpClient/raw/master/Samples/XDK-Http/Assets/SplashScreen.png";
-    DoHttpCall(url2, "", false, "SplashScreen.png");
+    DoHttpCall(url2, "", false, "SplashScreen.png", false);
 
     HCCleanup();
     ShutdownActiveThreads();

Source/HTTP/compression.cpp

@@ -0,0 +1,70 @@
+// Copyright (c) Microsoft Corporation
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#include "pch.h"
+
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+
+#include "compression.h"
+
+#define CHUNK 16384
+#define WINDOWBITS 15
+#define GZIP_ENCODING 16
+
+NAMESPACE_XBOX_HTTP_CLIENT_BEGIN
+
+Compression::Compression()
+{
+}
+
+void Compression::CompressToGzip(uint8_t* inData, uInt inDataSize, HCCompressionLevel compressionLevel, http_internal_vector<uint8_t>& outData)
+{
+    uint32_t compressionLevelValue = static_cast<std::underlying_type<HCCompressionLevel>::type>(compressionLevel);
+    z_stream stream;
+
+    stream.zalloc = Z_NULL;
+    stream.zfree = Z_NULL;
+    stream.opaque = Z_NULL;
+
+    // deflateInit will use zlib (deflate) compression, so deflateInit2 with these flags is required for GZIP Compression
+    deflateInit2(&stream, compressionLevelValue, Z_DEFLATED, WINDOWBITS | GZIP_ENCODING, 8, Z_DEFAULT_STRATEGY);
+
+    stream.next_in = inData;
+    stream.avail_in = inDataSize;
+
+    // Initialize output buffer with CHUNK size so first iteration of deflate will have enough room to allocate compressed bytes.
+    outData = http_internal_vector<uint8_t>(CHUNK);
+    uint8_t* bufferPtr;
+    size_t index = 0;
+
+    do
+    {
+        // bufferPtr is updated to point the next available byte in the output buffer so zlib will write the next chunk of compressed bytes from that position onwards
+        bufferPtr = &outData.at(index);
+
+        stream.avail_out = CHUNK;
+        stream.next_out = bufferPtr;
+        deflate(&stream, Z_FINISH);
+
+        // The value of avail_out after deflate will tell us how many bytes were unused in compression after deflate.
+        // A value of 0 means that all bytes available for compression were used so we need to keep iterating.
+        if (stream.avail_out == 0)
+        {
+            index = outData.size();
+            outData.resize(outData.size() + CHUNK);
+        }
+        // A non-zero value will indicate that there were some bytes left, which means that compression ended and we shrink the vector to its right size based on the leftover bytes.
+        else
+        {
+            outData.resize(outData.size() - stream.avail_out);
+        }
+    } 
+    while (stream.avail_out == 0);
+
+    deflateEnd(&stream);
+}
+
+NAMESPACE_XBOX_HTTP_CLIENT_END
+
+#endif
+#endif // !HC_NOZLIB

Source/HTTP/compression.h

@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft Corporation
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+#pragma once
+
+#include "utils.h"
+#include <zlib.h>
+
+NAMESPACE_XBOX_HTTP_CLIENT_BEGIN
+
+class Compression
+{
+public:
+    static void CompressToGzip(uint8_t* inData, uInt inDataSize, HCCompressionLevel compressionLevel, http_internal_vector<uint8_t>& outData);
+
+private:
+    Compression();
+};
+
+NAMESPACE_XBOX_HTTP_CLIENT_END
+#endif
+#endif // !HC_NOZLIB

Source/HTTP/httpcall.cpp

@@ -5,6 +5,7 @@
 #include <httpClient/httpProvider.h>
 #include "httpcall.h"
 #include "../Mock/lhc_mock.h"
+#include "compression.h"
 
 using namespace xbox::httpclient;
 
@@ -100,8 +101,23 @@ HRESULT CALLBACK HC_CALL::PerfomAsyncProvider(XAsyncOp op, XAsyncProviderData co
         }
         else
         {
-            // Schedule iteration 0
+#if !HC_NOZLIB && (HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK)
+            // Compress body before call if applicable
+            if (call->compressionLevel != HCCompressionLevel::None)
+            {
+                // Schedule compression task
+                RETURN_IF_FAILED(XTaskQueueSubmitDelayedCallback(context->workQueue, XTaskQueuePort::Work, performDelay, context, HC_CALL::CompressRequestBody));
+            }
+            else
+            {
+                RETURN_IF_FAILED(XTaskQueueSubmitDelayedCallback(context->workQueue, XTaskQueuePort::Work, performDelay, context, HC_CALL::PerformSingleRequest));
+            }
+#else
             RETURN_IF_FAILED(XTaskQueueSubmitDelayedCallback(context->workQueue, XTaskQueuePort::Work, performDelay, context, HC_CALL::PerformSingleRequest));
+#endif
+
+
+
         }
         return S_OK;
     }
@@ -137,6 +153,90 @@ HRESULT CALLBACK HC_CALL::PerfomAsyncProvider(XAsyncOp op, XAsyncProviderData co
     }
 }
 
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+
+void CALLBACK HC_CALL::CompressRequestBody(void* c, bool canceled)
+{
+    PerformContext* context{ static_cast<PerformContext*>(c) };
+    HC_CALL* call{ context->call };
+
+    if (canceled)
+    {
+        XAsyncComplete(context->asyncBlock, E_ABORT, 0);
+        return;
+    }
+
+    if (call->traceCall)
+    {
+        HC_TRACE_INFORMATION(HTTPCLIENT, "HC_CALL::CompressRequestBody [ID %llu] Iteration %d", TO_ULL(call->id), call->m_iterationNumber);
+    }
+
+    HCHttpCallRequestBodyReadFunction clientRequestBodyReadCallback{ nullptr };
+    size_t requestBodySize{};
+    void* clientRequestBodyReadCallbackContext{ nullptr };
+    HRESULT hr = HCHttpCallRequestGetRequestBodyReadFunction(call, &clientRequestBodyReadCallback, &requestBodySize, &clientRequestBodyReadCallbackContext);
+
+    if (FAILED(hr) || !clientRequestBodyReadCallback)
+    {
+        HC_TRACE_ERROR(HTTPCLIENT, "HC_CALL::CompressRequestBody: Unable to get client's RequestBodyRead callback");
+        return;
+    }
+
+    http_internal_vector<uint8_t> uncompressedRequestyBodyBuffer(requestBodySize);
+    uint8_t* bufferPtr = &uncompressedRequestyBodyBuffer.front();
+    size_t bytesWritten = 0;
+
+    try
+    {
+        hr = clientRequestBodyReadCallback(call, 0, requestBodySize, clientRequestBodyReadCallbackContext, bufferPtr, &bytesWritten);
+
+        if (FAILED(hr))
+        {
+            HC_TRACE_ERROR_HR(HTTPCLIENT, hr, "HC_CALL::CompressRequestBody: client RequestBodyRead callback failed");
+            return;
+        }
+
+        // Return error if client provides less bytes than expected.
+        if (bytesWritten < requestBodySize)
+        {
+            HC_TRACE_ERROR(HTTPCLIENT, "HC_CALL::CompressRequestBody: Expected more data written by the client based on initial request body size provided.");
+            return;
+        }
+    }
+    catch (...)
+    {
+        return;
+    }
+
+    http_internal_vector<uint8_t> compressedRequestBodyBuffer;
+
+    Compression::CompressToGzip(uncompressedRequestyBodyBuffer.data(), static_cast<unsigned int>(requestBodySize), call->compressionLevel, compressedRequestBodyBuffer);
+
+    // Setting back to default read request body callback to be invoked by Platform-specific code
+    call->requestBodyReadFunction = HC_CALL::ReadRequestBody;
+    call->requestBodyReadFunctionContext = nullptr;
+
+    // Directly setting compressed body bytes to HCCall
+    call->requestBodySize = (uint32_t)compressedRequestBodyBuffer.size();
+    call->requestBodyBytes = std::move(compressedRequestBodyBuffer);
+    call->requestBodyString.clear();
+
+    // Setting GZIP as the Content Encoding
+    call->requestHeaders["Content-Encoding"] = "gzip";
+
+    uint32_t performDelay{ 0 };
+    hr = XTaskQueueSubmitDelayedCallback(context->workQueue, XTaskQueuePort::Work, performDelay, context, HC_CALL::PerformSingleRequest);
+
+    if (FAILED(hr))
+    {
+        XAsyncComplete(context->asyncBlock, hr, 0);
+        return;
+    }
+}
+#endif
+#endif // !HC_NOZLIB
+
 void CALLBACK HC_CALL::PerformSingleRequest(void* c, bool canceled)
 {
     PerformContext* context{ static_cast<PerformContext*>(c) };

Source/HTTP/httpcall.h

@@ -54,6 +54,11 @@ public:
     bool sslValidation{ true };
 #endif
     uint32_t timeoutInSeconds{ 0 };
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+    HCCompressionLevel compressionLevel{ HCCompressionLevel::None };
+#endif
+#endif // !HC_NOZLIB
 
     // Response properties
     HRESULT networkErrorCode{ S_OK };
@@ -95,6 +100,12 @@ private:
     static HRESULT CALLBACK PerformSingleRequestAsyncProvider(XAsyncOp op, XAsyncProviderData const* data) noexcept;
     static void CALLBACK PerformSingleRequestComplete(XAsyncBlock* async);
 
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+    static void CALLBACK CompressRequestBody(void* context, bool canceled);
+#endif
+#endif // !HC_NOZLIB
+
     xbox::httpclient::Result<bool> ShouldFailFast(_Out_opt_ uint32_t& performDelay);   
     bool ShouldRetry(_Out_opt_ uint32_t& performDelay);
     xbox::httpclient::Result<std::chrono::seconds> GetRetryAfterHeaderTime();

Source/HTTP/httpcall_request.cpp

@@ -92,6 +92,35 @@ try
 }
 CATCH_RETURN()
 
+#if !HC_NOZLIB
+#if HC_PLATFORM == HC_PLATFORM_WIN32 || HC_PLATFORM == HC_PLATFORM_GDK
+STDAPI
+HCHttpCallRequestEnableGzipCompression(
+    _In_ HCCallHandle call,
+    _In_ HCCompressionLevel level
+) noexcept
+try
+{
+    if (call == nullptr)
+    {
+        return E_INVALIDARG;
+    }
+    RETURN_IF_PERFORM_CALLED(call);
+
+    auto httpSingleton = get_http_singleton();
+    if (nullptr == httpSingleton)
+        return E_HC_NOT_INITIALISED;
+
+    call->compressionLevel = level;
+
+    if (call->traceCall) { HC_TRACE_INFORMATION(HTTPCLIENT, "HCHttpCallRequestEnableGzipCompression [ID %llu]", TO_ULL(call->id)); }
+
+    return S_OK;
+}
+CATCH_RETURN()
+#endif
+#endif // !HC_NOZLIB
+
 STDAPI
 HCHttpCallRequestSetRequestBodyString(
     _In_ HCCallHandle call,

libHttpClient.vs2019.sln

@@ -65,6 +65,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Props", "Props", "{D6E41401
 		platform_select.props = platform_select.props
 	EndProjectSection
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libHttpClient.Zlib", "Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems", "{F9061DCA-255B-4D5E-8DF5-4AFBFB4B98EF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM = Debug|ARM
@@ -343,12 +345,14 @@ Global
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{53c69cf3-b0b8-4a64-b178-0e9370737f70}*SharedItemsImports = 4
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{66365e18-7b53-44bf-a348-6735058e359e}*SharedItemsImports = 4
 		Build\libHttpClient.GDK\libHttpClient.GDK.vcxitems*{66365e18-7b53-44bf-a348-6735058e359e}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{66365e18-7b53-44bf-a348-6735058e359e}*SharedItemsImports = 4
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{673e9758-fafe-4f91-8fc1-addda12c5de5}*SharedItemsImports = 9
 		Build\libHttpClient.GDK\libHttpClient.GDK.vcxitems*{8ca3b500-0d89-4db1-ba8b-98aeb468ca13}*SharedItemsImports = 9
 		Build\libHttpClient.UnitTest\libHttpClient.UnitTest.vcxitems*{8ef7009a-36cf-4d82-9fb7-6d69154893cf}*SharedItemsImports = 9
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{961f48ea-33a9-47f1-9c96-715d6094d79b}*SharedItemsImports = 4
 		Build\libHttpClient.Win32\libHttpClient.Win32.vcxitems*{961f48ea-33a9-47f1-9c96-715d6094d79b}*SharedItemsImports = 4
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{961f48ea-33a9-47f1-9c96-715d6094d79b}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{961f48ea-33a9-47f1-9c96-715d6094d79b}*SharedItemsImports = 4
 		Build\libcrypto.Win32\libcrypto.Win32.vcxitems*{9c459b54-e085-42f3-a671-7f55c2994048}*SharedItemsImports = 4
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{9dd2ba60-6505-493a-8c41-8085c44e9f1f}*SharedItemsImports = 4
 		Build\libHttpClient.UnitTest\libHttpClient.UnitTest.vcxitems*{9dd2ba60-6505-493a-8c41-8085c44e9f1f}*SharedItemsImports = 4
@@ -358,5 +362,6 @@ Global
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
 		Build\libHttpClient.UnitTest\libHttpClient.UnitTest.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{f9061dca-255b-4d5e-8df5-4afbfb4b98ef}*SharedItemsImports = 9
 	EndGlobalSection
 EndGlobal

libHttpClient.vs2022.sln

@@ -67,6 +67,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libHttpClient.UnitTest.TE",
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libHttpClient.XAsync", "Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems", "{B5118956-53CC-4B24-8807-DE8D7D226B40}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libHttpClient.Zlib", "Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems", "{F9061DCA-255B-4D5E-8DF5-4AFBFB4B98EF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM = Debug|ARM
@@ -345,6 +347,7 @@ Global
 		Build\libssl.Win32\libssl.Win32.vcxitems*{097e9d46-215e-43ae-b8df-339edf537eb6}*SharedItemsImports = 9
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{0a6d51a3-0d86-4d0e-9daa-54ba75e1da1c}*SharedItemsImports = 4
 		Build\libHttpClient.GDK\libHttpClient.GDK.vcxitems*{0a6d51a3-0d86-4d0e-9daa-54ba75e1da1c}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{0a6d51a3-0d86-4d0e-9daa-54ba75e1da1c}*SharedItemsImports = 4
 		Build\libcrypto.Win32\libcrypto.Win32.vcxitems*{16aa2ebe-6d49-41b7-a13f-887c12e78715}*SharedItemsImports = 4
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{2e55aa9f-a132-477c-b4ff-b4cd551e4322}*SharedItemsImports = 4
 		Build\libHttpClient.UWP\libHttpClient.UWP.vcxitems*{2e55aa9f-a132-477c-b4ff-b4cd551e4322}*SharedItemsImports = 4
@@ -356,6 +359,7 @@ Global
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{9164c6c9-3872-4922-a3e3-3822622d3e71}*SharedItemsImports = 4
 		Build\libHttpClient.Win32\libHttpClient.Win32.vcxitems*{9164c6c9-3872-4922-a3e3-3822622d3e71}*SharedItemsImports = 4
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{9164c6c9-3872-4922-a3e3-3822622d3e71}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{9164c6c9-3872-4922-a3e3-3822622d3e71}*SharedItemsImports = 4
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{9dd2ba60-6505-493a-8c41-8085c44e9f1f}*SharedItemsImports = 4
 		Build\libHttpClient.UnitTest\libHttpClient.UnitTest.vcxitems*{9dd2ba60-6505-493a-8c41-8085c44e9f1f}*SharedItemsImports = 4
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{9dd2ba60-6505-493a-8c41-8085c44e9f1f}*SharedItemsImports = 4
@@ -366,5 +370,6 @@ Global
 		Build\libHttpClient.Common\libHttpClient.Common.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
 		Build\libHttpClient.UnitTest\libHttpClient.UnitTest.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
 		Build\libHttpClient.XAsync\libHttpClient.XAsync.vcxitems*{e885bb30-f51e-4bab-9300-4b303144bb49}*SharedItemsImports = 4
+		Build\libHttpClient.Zlib\libHttpClient.Zlib.vcxitems*{f9061dca-255b-4d5e-8df5-4afbfb4b98ef}*SharedItemsImports = 9
 	EndGlobalSection
 EndGlobal