[standalone] Automatically decompress gzip'd resources, including sources and script snapshots.

runtime/bin/dfe.cc

Index: runtime/bin/dfe.cc
diff --git a/runtime/bin/dfe.cc b/runtime/bin/dfe.cc
index bc83f5be15b0d359463df83e3aba4a39cb96850b..b02ae91b91adac1e9a87d63f8c4bf4ffe8f5ce89 100644
--- a/runtime/bin/dfe.cc
+++ b/runtime/bin/dfe.cc
@@ -146,7 +146,7 @@ bool DFE::TryReadKernelFile(const char* script_uri,
       // We need a temporary variable because SniffForMagicNumber modifies the
       // buffer pointer to skip snapshot magic number.
       const uint8_t* temp = buffer;
-      if (DartUtils::SniffForMagicNumber(&temp, kernel_ir_size) !=
+      if (DartUtils::SniffForMagicNumber(temp, *kernel_ir_size) !=

[siva, 2017/08/04 17:11:29]

Now that SniffMagicNumber does not modify the buffer pointer, the command above
can be removed and the cal could just be
if (DartUtils::SniffForMagicNumber(buffer, *kernel_ir_size)

Another aspect I don't understand is this call updates the kernel_ir_size
variable which is updated back to the caller but the magic number is not skipped
so I am not sure how the kernel reader does not run into an issue because of
that.

[rmacnak, 2017/08/07 18:18:57]

Done.
The kernel reader expects to see its magic number, unlike the snapshot reader
that expect the embedder to strip it because the embedder was the one who added
it in the first place.

           DartUtils::kKernelMagicNumber) {
         free(const_cast<uint8_t*>(buffer));
         *kernel_ir = NULL;