// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/tools/singlejar/zlib_interface.h"

#include <cstddef>
#include <cstdint>

#include "googletest/include/gtest/gtest.h"

namespace {

  static const uint8_t bytes[] = {1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4};

  TEST(ZlibInterfaceTest, DeflateFully) {
    Deflater deflater;
    uint8_t compressed[256];
    deflater.next_out = compressed;
    deflater.avail_out = sizeof(compressed);
    EXPECT_EQ(Z_STREAM_END, deflater.Deflate(bytes, sizeof(bytes), Z_FINISH));
  }

  TEST(ZlibInterfaceTest, DeflateIntoChunks) {
    Deflater deflater;
    uint8_t compressed[256];
    deflater.next_out = compressed;
    deflater.avail_out = 2;
    EXPECT_EQ(Z_OK, deflater.Deflate(bytes, sizeof(bytes), Z_FINISH));
    EXPECT_EQ(0UL, deflater.avail_out);
    deflater.next_out = compressed + 2;
    deflater.avail_out = sizeof(compressed) - 2;
    EXPECT_EQ(Z_STREAM_END,
              deflater.Deflate(deflater.next_in, deflater.avail_in, Z_FINISH));
  }

  TEST(ZlibInterfaceTest, DeflateChunks) {
    Deflater deflater;
    uint8_t compressed[256];
    deflater.next_out = compressed;
    deflater.avail_out = sizeof(compressed);
    EXPECT_EQ(Z_OK, deflater.Deflate(bytes, 4, Z_NO_FLUSH));
    EXPECT_EQ(Z_STREAM_END,
              deflater.Deflate(bytes + 4, sizeof(bytes) - 4, Z_FINISH));
  }

  TEST(ZlibInterfaceTest, InflateFully) {
    uint8_t compressed[256];
    Deflater deflater;
    deflater.next_out = compressed;
    deflater.avail_out = sizeof(compressed);
    EXPECT_EQ(Z_STREAM_END, deflater.Deflate(bytes, sizeof(bytes), Z_FINISH));

    // Now we have deflated data, inflate it back and compare.
    size_t compressed_size = sizeof(compressed) - deflater.avail_out;
    Inflater inflater;
    inflater.DataToInflate(compressed, compressed_size);

    uint8_t uncompressed[256];
    memset(uncompressed, 0, sizeof(uncompressed));
    EXPECT_EQ(Z_STREAM_END,
              inflater.Inflate(uncompressed, sizeof(uncompressed)));
    EXPECT_EQ(sizeof(bytes), sizeof(uncompressed) - inflater.available_out());
    EXPECT_EQ(0, memcmp(bytes, uncompressed, sizeof(bytes)));
  }

  TEST(ZlibInterfaceTest, InflateToChunks) {
    uint8_t compressed[256];
    Deflater deflater;
    deflater.next_out = compressed;
    deflater.avail_out = sizeof(compressed);
    EXPECT_EQ(Z_STREAM_END, deflater.Deflate(bytes, sizeof(bytes), Z_FINISH));

    // Now we have deflated data, inflate it back and compare.
    size_t compressed_size = sizeof(compressed) - deflater.avail_out;
    Inflater inflater;
    inflater.DataToInflate(compressed, compressed_size);
    uint8_t uncompressed[256];
    memset(uncompressed, 0, sizeof(uncompressed));
    EXPECT_EQ(Z_OK, inflater.Inflate(uncompressed, 3));
    EXPECT_EQ(Z_STREAM_END,
              inflater.Inflate(uncompressed + 3, sizeof(uncompressed) - 3));
    EXPECT_EQ(0, memcmp(bytes, uncompressed, sizeof(bytes)));
  }

}  //  namespace