Add 64-bit absolute address support to courgette.

Turns out, courgette never really understood 64-bit addresses, and they were all being truncated to 32-bit values. This worked fine, as the high 32-bit part was just serialized as byte data, but would have broken for a 64-bit PE image that straddled the 32-bit boundary.

This CL adds a new op code for ABS64 to ensure that 64-bit math is used when assembling them, but re-uses the existing abs32 streams (since RVA are always 32-bit).  This always reduces the size of the patch, but only by a tiny amount, since the four bytes in the absolute addresses no longer need to be stored separately.

This also fixes static cast by reading the 8-byte absolute address from 64-bit binaries.

This change is virtually size neutral.  Against test binaries (64-bit chrome.dll 40.0.2214.115->43.0.2317.0) the uncompressed patch sizes were:

before: 10,948,152
after: 10,925,425 (0.2% reduction)

BUG=419996
TEST=courgette_unittests

Review URL: https://codereview.chromium.org/629643002

Cr-Commit-Position: refs/heads/master@{#320449}

1 files changed, 4 insertions, 4 deletions

diff --git a/courgette/encode_decode_unittest.cc b/courgette/encode_decode_unittest.cc
index a3161ce..4240c5c 100644
--- a/courgette/encode_decode_unittest.cc
+++ b/courgette/encode_decode_unittest.cc
@@ -70,20 +70,20 @@ void EncodeDecodeTest::TestAssembleToStreamDisassemble(
 
 TEST_F(EncodeDecodeTest, PE) {
   std::string file = FileContents("setup1.exe");
-  TestAssembleToStreamDisassemble(file, 971850);
+  TestAssembleToStreamDisassemble(file, 971851);
 }
 
 TEST_F(EncodeDecodeTest, PE64) {
   std::string file = FileContents("chrome64_1.exe");
-  TestAssembleToStreamDisassemble(file, 814709);
+  TestAssembleToStreamDisassemble(file, 803782);
 }
 
 TEST_F(EncodeDecodeTest, Elf_Small) {
   std::string file = FileContents("elf-32-1");
-  TestAssembleToStreamDisassemble(file, 135988);
+  TestAssembleToStreamDisassemble(file, 135989);
 }
 
 TEST_F(EncodeDecodeTest, Elf_HighBSS) {
   std::string file = FileContents("elf-32-high-bss");
-  TestAssembleToStreamDisassemble(file, 7308);
+  TestAssembleToStreamDisassemble(file, 7309);
 }