New ZipReader::ExtractCurrentEntryToString API.

third_party/zlib/google/zip_reader_unittest.cc

Index: third_party/zlib/google/zip_reader_unittest.cc
diff --git a/third_party/zlib/google/zip_reader_unittest.cc b/third_party/zlib/google/zip_reader_unittest.cc
index df20e6fe3367a93cb810dd8c5008b821bf2ad444..a137d9dd1bc0b85fb80740f12799eb44f28f9d37 100644
--- a/third_party/zlib/google/zip_reader_unittest.cc
+++ b/third_party/zlib/google/zip_reader_unittest.cc
@@ -15,6 +15,7 @@
 #include "base/md5.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -534,4 +535,42 @@ TEST_F(ZipReaderTest, ExtractToFileAsync_Directory) {
   ASSERT_TRUE(base::DirectoryExists(target_file));
 }
 
+TEST_F(ZipReaderTest, ExtractCurrentEntryToString) {
+  // test_mismatch_size.zip contains files with names from 0.txt to 7.txt with
+  // sizes from 0 to 7 bytes respectively, being the contents of each file a
+  // substring of "0123456" starting at '0'.
+  base::FilePath test_zip_file =
+      test_data_dir_.AppendASCII("test_mismatch_size.zip");
+
+  ZipReader reader;
+  std::string contents;
+  ASSERT_TRUE(reader.Open(test_zip_file));
+
+  for (size_t i = 0; i < 8; i++) {
+    SCOPED_TRACE(base::StringPrintf("Processing %d.txt", static_cast<int>(i)));
+
+    base::FilePath file_name = base::FilePath::FromUTF8Unsafe(
+        base::StringPrintf("%d.txt", static_cast<int>(i)));
+    ASSERT_TRUE(reader.LocateAndOpenEntry(file_name));
+
+    if (i > 1) {
+      // Off by one byte read limit: must fail.
+      EXPECT_FALSE(reader.ExtractCurrentEntryToString(i - 1, &contents));
+    }
+
+    if (i > 0) {
+      // Exact byte read limit: must pass.
+      EXPECT_TRUE(reader.ExtractCurrentEntryToString(i, &contents));
+      EXPECT_EQ(i, contents.size());
+      EXPECT_EQ(0, memcmp(contents.c_str(), "0123456", i));
+    }
+
+    // More than necessary byte read limit: must pass.
+    EXPECT_TRUE(reader.ExtractCurrentEntryToString(16, &contents));
+    EXPECT_EQ(i, contents.size());
+    EXPECT_EQ(0, memcmp(contents.c_str(), "0123456", i));
+  }
+  reader.Close();
+}
+
 }  // namespace zip