[ZLIB] Add support for windowBits, memLevel, raw

runtime/bin/filter.cc

Index: runtime/bin/filter.cc
diff --git a/runtime/bin/filter.cc b/runtime/bin/filter.cc
index 3ea389d1549112ffe6db6d68c22fa74d54fbf319..548b35521e57673bde553794a85efda479aa3954 100644
--- a/runtime/bin/filter.cc
+++ b/runtime/bin/filter.cc
@@ -38,7 +38,19 @@ void EndFilter(Dart_Handle filter_obj, Filter* filter) {
 
 void FUNCTION_NAME(Filter_CreateZLibInflate)(Dart_NativeArguments args) {
   Dart_Handle filter_obj = Dart_GetNativeArgument(args, 0);
-  Filter* filter = new ZLibInflateFilter();
+  Dart_Handle wBits_obj = Dart_GetNativeArgument(args, 1);
+  int64_t windowBits;
+  if (Dart_IsError(Dart_IntegerToInt64(wBits_obj, &windowBits))) {
+    Dart_ThrowException(DartUtils::NewInternalError(
+        "Failed to get 'windowBits' parameter"));
+  }
+  Dart_Handle raw_obj = Dart_GetNativeArgument(args, 2);
+  bool raw;
+  if (Dart_IsError(Dart_BooleanValue(raw_obj, &raw))) {
+    Dart_ThrowException(DartUtils::NewInternalError(
+        "Failed to get 'raw' parameter"));
+  }
+  Filter* filter = new ZLibInflateFilter(windowBits, raw);
   if (filter == NULL || !filter->Init()) {
     delete filter;
     Dart_ThrowException(DartUtils::NewInternalError(
@@ -54,18 +66,30 @@ void FUNCTION_NAME(Filter_CreateZLibInflate)(Dart_NativeArguments args) {
 void FUNCTION_NAME(Filter_CreateZLibDeflate)(Dart_NativeArguments args) {
   Dart_Handle filter_obj = Dart_GetNativeArgument(args, 0);
   Dart_Handle gzip_obj = Dart_GetNativeArgument(args, 1);
-  Dart_Handle level_obj = Dart_GetNativeArgument(args, 2);
   bool gzip;
   if (Dart_IsError(Dart_BooleanValue(gzip_obj, &gzip))) {
     Dart_ThrowException(DartUtils::NewInternalError(
         "Failed to get 'gzip' parameter"));
   }
+  Dart_Handle level_obj = Dart_GetNativeArgument(args, 2);
   int64_t level;
   if (Dart_IsError(Dart_IntegerToInt64(level_obj, &level))) {
     Dart_ThrowException(DartUtils::NewInternalError(
         "Failed to get 'level' parameter"));
   }
-  Filter* filter = new ZLibDeflateFilter(gzip, level);
+  Dart_Handle wBits_obj = Dart_GetNativeArgument(args, 3);
+  int64_t windowBits;
+  if (Dart_IsError(Dart_IntegerToInt64(wBits_obj, &windowBits))) {
+    Dart_ThrowException(DartUtils::NewInternalError(
+        "Failed to get 'windowBits' parameter"));
+  }
+  Dart_Handle raw_obj = Dart_GetNativeArgument(args, 4);
+  bool raw;
+  if (Dart_IsError(Dart_BooleanValue(raw_obj, &raw))) {
+    Dart_ThrowException(DartUtils::NewInternalError(
+        "Failed to get 'raw' parameter"));
+  }
+  Filter* filter = new ZLibDeflateFilter(gzip, level, windowBits, raw);
   if (filter == NULL || !filter->Init()) {
     delete filter;
     Dart_ThrowException(DartUtils::NewInternalError(
@@ -190,6 +214,13 @@ ZLibDeflateFilter::~ZLibDeflateFilter() {
 
 
 bool ZLibDeflateFilter::Init() {
+  int windowBits = windowBits_;
+  // todo(vbe) raw
+  if (raw_) {
+    windowBits *= -1;
+  } else if (gzip_) {
+    windowBits += kZLibFlagUseGZipHeader;
+  }
   stream_.zalloc = Z_NULL;
   stream_.zfree = Z_NULL;
   stream_.opaque = Z_NULL;
@@ -197,7 +228,7 @@ bool ZLibDeflateFilter::Init() {
       &stream_,
       level_,
       Z_DEFLATED,
-      kZLibFlagWindowBits | (gzip_ ? kZLibFlagUseGZipHeader : 0),
+      windowBits,
       kZlibFlagMemUsage,
       Z_DEFAULT_STRATEGY);
   if (result == Z_OK) {
@@ -230,16 +261,13 @@ intptr_t ZLibDeflateFilter::Processed(uint8_t* buffer,
       if (processed == 0) {
         delete[] current_buffer_;
         current_buffer_ = NULL;
-        return 0;
-      } else {
-        // We processed data, should be called again.
-        return processed;
       }
+      return processed;
     }
 
     default:
     case Z_STREAM_ERROR:
-      // An error occoured.
+      // An error occurred.
       delete[] current_buffer_;
       current_buffer_ = NULL;
       return -1;
@@ -254,11 +282,14 @@ ZLibInflateFilter::~ZLibInflateFilter() {
 
 
 bool ZLibInflateFilter::Init() {
+  int windowBits = raw_ ?
+      -1 * windowBits_ :
+      windowBits_ | kZLibFlagAcceptAnyHeader;
+
   stream_.zalloc = Z_NULL;
   stream_.zfree = Z_NULL;
   stream_.opaque = Z_NULL;
-  int result = inflateInit2(&stream_,
-                            kZLibFlagWindowBits | kZLibFlagAcceptAnyHeader);
+  int result = inflateInit2(&stream_, windowBits);
   if (result == Z_OK) {
     set_initialized(true);
     return true;
@@ -290,11 +321,8 @@ intptr_t ZLibInflateFilter::Processed(uint8_t* buffer,
       if (processed == 0) {
         delete[] current_buffer_;
         current_buffer_ = NULL;
-        return 0;
-      } else {
-        // We processed data, should be called again.
-        return processed;
       }
+      return processed;
     }
 
     default: