diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index 12e1399..b1aefa4 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -495,19 +495,15 @@
     return 1;
   }
 
-  std::string target_str(target_filename);
-  std::vector<std::string> pieces = android::base::Split(target_str, ":");
-  if (pieces.size() != 2 || pieces[0] != "EMMC") {
+  std::vector<std::string> pieces = android::base::Split(target_filename, ":");
+  if (pieces.size() != 4 || pieces[0] != "EMMC") {
     LOG(ERROR) << "Invalid target name \"" << target_filename << "\"";
     return 1;
   }
 
   // Load the target into the source_file object to see if already applied.
-  pieces.push_back(std::to_string(target_size));
-  pieces.push_back(target_sha1_str);
-  std::string fullname = android::base::Join(pieces, ':');
   FileContents source_file;
-  if (LoadPartitionContents(fullname, &source_file) == 0 &&
+  if (LoadPartitionContents(target_filename, &source_file) == 0 &&
       memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) == 0) {
     // The early-exit case: the image was already applied, this partition has the desired hash,
     // nothing for us to do.
diff --git a/applypatch/applypatch_main.cpp b/applypatch/applypatch_main.cpp
index 197077c..4fa73d3 100644
--- a/applypatch/applypatch_main.cpp
+++ b/applypatch/applypatch_main.cpp
@@ -16,13 +16,7 @@
 
 #include "applypatch_modes.h"
 
-// This program (applypatch) applies binary patches to files in a way that
-// is safe (the original file is not touched until we have the desired
-// replacement for it) and idempotent (it's okay to run this program
-// multiple times).
-//
-// See the comments to applypatch_modes() function.
-
+// See the comments for applypatch() function.
 int main(int argc, char** argv) {
-    return applypatch_modes(argc, const_cast<const char**>(argv));
+  return applypatch_modes(argc, argv);
 }
diff --git a/applypatch/applypatch_modes.cpp b/applypatch/applypatch_modes.cpp
index ec95325..f130ea2 100644
--- a/applypatch/applypatch_modes.cpp
+++ b/applypatch/applypatch_modes.cpp
@@ -16,6 +16,7 @@
 
 #include "applypatch_modes.h"
 
+#include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -25,6 +26,7 @@
 #include <string>
 #include <vector>
 
+#include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/strings.h>
@@ -33,157 +35,162 @@
 #include "applypatch/applypatch.h"
 #include "edify/expr.h"
 
-static int CheckMode(int argc, const char** argv) {
-    if (argc < 3) {
-        return 2;
-    }
-    std::vector<std::string> sha1;
-    for (int i = 3; i < argc; i++) {
-        sha1.push_back(argv[i]);
-    }
-
-    return applypatch_check(argv[2], sha1);
+static int CheckMode(const std::string& target) {
+  return applypatch_check(target, {});
 }
 
-// Parse arguments (which should be of the form "<sha1>:<filename>" into the
-// new parallel arrays *sha1s and *files. Returns true on success.
-static bool ParsePatchArgs(int argc, const char** argv, std::vector<std::string>* sha1s,
-                           std::vector<FileContents>* files) {
-    if (sha1s == nullptr) {
-        return false;
-    }
-    for (int i = 0; i < argc; ++i) {
-        std::vector<std::string> pieces = android::base::Split(argv[i], ":");
-        if (pieces.size() != 2) {
-          LOG(ERROR) << "Failed to parse patch argument \"" << argv[i] << "\"";
-          return false;
-        }
-
-        uint8_t digest[SHA_DIGEST_LENGTH];
-        if (ParseSha1(pieces[0], digest) != 0) {
-          LOG(ERROR) << "Failed to parse SHA-1 \"" << argv[i] << "\"";
-          return false;
-        }
-
-        sha1s->push_back(pieces[0]);
-        FileContents fc;
-        if (LoadFileContents(pieces[1].c_str(), &fc) != 0) {
-            return false;
-        }
-        files->push_back(std::move(fc));
-    }
-    return true;
-}
-
-static int FlashMode(const char* src_filename, const char* tgt_filename,
-                     const char* tgt_sha1, size_t tgt_size) {
-    return applypatch_flash(src_filename, tgt_filename, tgt_sha1, tgt_size);
-}
-
-static int PatchMode(int argc, const char** argv) {
-  std::unique_ptr<Value> bonus;
-  if (argc >= 3 && strcmp(argv[1], "-b") == 0) {
-    FileContents bonus_fc;
-    if (LoadFileContents(argv[2], &bonus_fc) != 0) {
-      LOG(ERROR) << "Failed to load bonus file " << argv[2];
-      return 1;
-    }
-    bonus = std::make_unique<Value>(Value::Type::BLOB,
-                                    std::string(bonus_fc.data.cbegin(), bonus_fc.data.cend()));
-    argc -= 2;
-    argv += 2;
+static int FlashMode(const std::string& target_emmc, const std::string& source_file) {
+  std::vector<std::string> pieces = android::base::Split(target_emmc, ":");
+  if (pieces.size() != 4 || pieces[0] != "EMMC") {
+    return 2;
   }
+  size_t target_size;
+  if (!android::base::ParseUint(pieces[2], &target_size) || target_size == 0) {
+    LOG(ERROR) << "Failed to parse \"" << pieces[2] << "\" as byte count";
+    return 1;
+  }
+  return applypatch_flash(source_file.c_str(), target_emmc.c_str(), pieces[3].c_str(), target_size);
+}
 
-  if (argc < 4) {
+static int PatchMode(const std::string& target_emmc, const std::string& source_emmc,
+                     const std::string& patch_file, const std::string& bonus_file) {
+  std::vector<std::string> target_pieces = android::base::Split(target_emmc, ":");
+  if (target_pieces.size() != 4 || target_pieces[0] != "EMMC") {
     return 2;
   }
 
   size_t target_size;
-  if (!android::base::ParseUint(argv[4], &target_size) || target_size == 0) {
-    LOG(ERROR) << "Failed to parse \"" << argv[4] << "\" as byte count";
+  if (!android::base::ParseUint(target_pieces[2], &target_size) || target_size == 0) {
+    LOG(ERROR) << "Failed to parse \"" << target_pieces[2] << "\" as byte count";
     return 1;
   }
 
-  // If no <src-sha1>:<patch> is provided, it is in flash mode.
-  if (argc == 5) {
-    if (bonus) {
-      LOG(ERROR) << "bonus file not supported in flash mode";
-      return 1;
-    }
-    return FlashMode(argv[1], argv[2], argv[3], target_size);
-  }
-
-  std::vector<std::string> sha1s;
-  std::vector<FileContents> files;
-  if (!ParsePatchArgs(argc - 5, argv + 5, &sha1s, &files)) {
-    LOG(ERROR) << "Failed to parse patch args";
-    return 1;
-  }
-
-  std::vector<std::unique_ptr<Value>> patches;
-  for (const auto& file : files) {
-    patches.push_back(std::make_unique<Value>(Value::Type::BLOB,
-                                              std::string(file.data.cbegin(), file.data.cend())));
-  }
-  return applypatch(argv[1], argv[2], argv[3], target_size, sha1s, patches, bonus.get());
-}
-
-// This program (applypatch) applies binary patches to files in a way that
-// is safe (the original file is not touched until we have the desired
-// replacement for it) and idempotent (it's okay to run this program
-// multiple times).
-//
-// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
-//   successfully.
-//
-// - otherwise, if no <src-sha1>:<patch> is provided, flashes <tgt-file> with
-//   <src-file>. <tgt-file> must be a partition name, while <src-file> must
-//   be a regular image file. <src-file> will not be deleted on success.
-//
-// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
-//   bsdiff <patch> to <src-file> to produce a new file (the type of patch
-//   is automatically detected from the file header).  If that new
-//   file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
-//   exits successfully.  Note that if <src-file> and <tgt-file> are
-//   not the same, <src-file> is NOT deleted on success.  <tgt-file>
-//   may be the string "-" to mean "the same as src-file".
-//
-// - otherwise, or if any error is encountered, exits with non-zero
-//   status.
-//
-// <src-file> (or <file> in check mode) may refer to an EMMC partition
-// to read the source data.  See the comments for the
-// LoadPartitionContents() function for the format of such a filename.
-
-int applypatch_modes(int argc, const char** argv) {
-  if (argc < 2) {
-  usage:
-    // clang-format off
-    LOG(INFO) << "Usage: \n"
-              << "  " << argv[0] << " [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> "
-                 "<tgt-size> [<src-sha1>:<patch> ...]\n"
-              << "  " << argv[0] << " -c <file> [<sha1> ...]\n"
-              << "  " << argv[0] << " -l\n"
-              << "\n"
-              << "Filenames may be of the form\n"
-              << "  EMMC:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
-              << "to specify reading from or writing to an EMMC partition.\n\n";
-    // clang-format on
+  std::vector<std::string> source_pieces = android::base::Split(source_emmc, ":");
+  if (source_pieces.size() != 4 || source_pieces[0] != "EMMC") {
     return 2;
   }
 
-  int result;
-
-  if (strncmp(argv[1], "-l", 3) == 0) {
-    result = ShowLicenses();
-  } else if (strncmp(argv[1], "-c", 3) == 0) {
-    result = CheckMode(argc, argv);
-  } else {
-    result = PatchMode(argc, argv);
+  size_t source_size;
+  if (!android::base::ParseUint(source_pieces[2], &source_size) || source_size == 0) {
+    LOG(ERROR) << "Failed to parse \"" << source_pieces[2] << "\" as byte count";
+    return 1;
   }
 
-  if (result == 2) {
-    goto usage;
+  std::string contents;
+  if (!android::base::ReadFileToString(patch_file, &contents)) {
+    PLOG(ERROR) << "Failed to read patch file \"" << patch_file << "\"";
+    return 1;
   }
-  return result;
+  std::vector<std::unique_ptr<Value>> patches;
+  patches.push_back(std::make_unique<Value>(Value::Type::BLOB, std::move(contents)));
+  std::vector<std::string> sha1s{ source_pieces[3] };
+
+  std::unique_ptr<Value> bonus;
+  if (!bonus_file.empty()) {
+    std::string bonus_contents;
+    if (!android::base::ReadFileToString(bonus_file, &bonus_contents)) {
+      PLOG(ERROR) << "Failed to read bonus file \"" << bonus_file << "\"";
+      return 1;
+    }
+    bonus = std::make_unique<Value>(Value::Type::BLOB, std::move(bonus_contents));
+  }
+
+  return applypatch(source_emmc.c_str(), target_emmc.c_str(), target_pieces[3].c_str(), target_size,
+                    sha1s, patches, bonus.get());
+}
+
+static void Usage() {
+  printf(
+      "Usage: \n"
+      "check mode\n"
+      "  applypatch --check EMMC:<target-file>:<target-size>:<target-sha1>\n\n"
+      "flash mode\n"
+      "  applypatch --flash <source-file>\n"
+      "             --target EMMC:<target-file>:<target-size>:<target-sha1>\n\n"
+      "patch mode\n"
+      "  applypatch [--bonus <bonus-file>]\n"
+      "             --patch <patch-file>\n"
+      "             --target EMMC:<target-file>:<target-size>:<target-sha1>\n"
+      "             --source EMMC:<source-file>:<source-size>:<source-sha1>\n\n"
+      "show license\n"
+      "  applypatch --license\n"
+      "\n\n");
+}
+
+int applypatch_modes(int argc, char* argv[]) {
+  static constexpr struct option OPTIONS[]{
+    // clang-format off
+    { "bonus", required_argument, nullptr, 0 },
+    { "check", required_argument, nullptr, 0 },
+    { "flash", required_argument, nullptr, 0 },
+    { "license", no_argument, nullptr, 0 },
+    { "patch", required_argument, nullptr, 0 },
+    { "source", required_argument, nullptr, 0 },
+    { "target", required_argument, nullptr, 0 },
+    { nullptr, 0, nullptr, 0 },
+    // clang-format on
+  };
+
+  std::string check_target;
+  std::string source;
+  std::string target;
+  std::string patch;
+  std::string bonus;
+
+  bool check_mode = false;
+  bool flash_mode = false;
+  bool patch_mode = false;
+
+  optind = 1;
+
+  int arg;
+  int option_index;
+  while ((arg = getopt_long(argc, argv, "", OPTIONS, &option_index)) != -1) {
+    switch (arg) {
+      case 0: {
+        std::string option = OPTIONS[option_index].name;
+        if (option == "bonus") {
+          bonus = optarg;
+        } else if (option == "check") {
+          check_target = optarg;
+          check_mode = true;
+        } else if (option == "flash") {
+          source = optarg;
+          flash_mode = true;
+        } else if (option == "license") {
+          return ShowLicenses();
+        } else if (option == "patch") {
+          patch = optarg;
+          patch_mode = true;
+        } else if (option == "source") {
+          source = optarg;
+        } else if (option == "target") {
+          target = optarg;
+        }
+        break;
+      }
+      case '?':
+      default:
+        LOG(ERROR) << "Invalid argument";
+        Usage();
+        return 2;
+    }
+  }
+
+  if (check_mode) {
+    return CheckMode(check_target);
+  }
+  if (flash_mode) {
+    if (!bonus.empty()) {
+      LOG(ERROR) << "bonus file not supported in flash mode";
+      return 1;
+    }
+    return FlashMode(target, source);
+  }
+  if (patch_mode) {
+    return PatchMode(target, source, patch, bonus);
+  }
+
+  Usage();
+  return 2;
 }
diff --git a/applypatch/applypatch_modes.h b/applypatch/applypatch_modes.h
index 3d9d08d..aa60a43 100644
--- a/applypatch/applypatch_modes.h
+++ b/applypatch/applypatch_modes.h
@@ -17,6 +17,6 @@
 #ifndef _APPLYPATCH_MODES_H
 #define _APPLYPATCH_MODES_H
 
-int applypatch_modes(int argc, const char** argv);
+int applypatch_modes(int argc, char* argv[]);
 
 #endif // _APPLYPATCH_MODES_H
diff --git a/applypatch/include/applypatch/applypatch.h b/applypatch/include/applypatch/applypatch.h
index 28dba7e..cf65f3f 100644
--- a/applypatch/include/applypatch/applypatch.h
+++ b/applypatch/include/applypatch/applypatch.h
@@ -75,10 +75,11 @@
 // 'sha1s' to find a match on /cache if the hashes embedded in the filename fail to match.
 int applypatch_check(const std::string& filename, const std::vector<std::string>& sha1s);
 
-// Flashes a given image to the target partition. It verifies the target cheksum first, and will
-// return if target already has the desired hash. Otherwise it checks the checksum of the given
-// source image before flashing, and verifies the target partition afterwards. The function is
-// idempotent. Returns zero on success.
+// Flashes a given image to the eMMC target partition. It verifies the target cheksum first, and
+// will return if target already has the desired hash. Otherwise it checks the checksum of the
+// given source image before flashing, and verifies the target partition afterwards.
+// 'target_filename' must refer to an eMMC partition, of the form "EMMC:<device>:<size>:<hash>".
+// The function is idempotent. Returns zero on success.
 int applypatch_flash(const char* source_filename, const char* target_filename,
                      const char* target_sha1_str, size_t target_size);
 
diff --git a/tests/component/applypatch_modes_test.cpp b/tests/component/applypatch_modes_test.cpp
index bfdc9ca..ce01f4f 100644
--- a/tests/component/applypatch_modes_test.cpp
+++ b/tests/component/applypatch_modes_test.cpp
@@ -21,7 +21,8 @@
 #include <vector>
 
 #include <android-base/file.h>
-#include <android-base/stringprintf.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
 #include <android-base/test_utils.h>
 #include <bsdiff/bsdiff.h>
 #include <gtest/gtest.h>
@@ -31,160 +32,112 @@
 #include "common/test_constants.h"
 #include "otautil/paths.h"
 #include "otautil/print_sha1.h"
+#include "otautil/sysutil.h"
 
 using namespace std::string_literals;
 
-static void sha1sum(const std::string& fname, std::string* sha1, size_t* fsize = nullptr) {
-  ASSERT_TRUE(sha1 != nullptr);
-
+// Loads a given partition and returns a string of form "EMMC:name:size:hash".
+static std::string GetEmmcTargetString(const std::string& filename,
+                                       const std::string& display_name = "") {
   std::string data;
-  ASSERT_TRUE(android::base::ReadFileToString(fname, &data));
-
-  if (fsize != nullptr) {
-    *fsize = data.size();
+  if (!android::base::ReadFileToString(filename, &data)) {
+    PLOG(ERROR) << "Failed to read " << filename;
+    return {};
   }
 
   uint8_t digest[SHA_DIGEST_LENGTH];
   SHA1(reinterpret_cast<const uint8_t*>(data.c_str()), data.size(), digest);
-  *sha1 = print_sha1(digest);
+
+  return "EMMC:"s + (display_name.empty() ? filename : display_name) + ":" +
+         std::to_string(data.size()) + ":" + print_sha1(digest);
 }
 
 class ApplyPatchModesTest : public ::testing::Test {
  protected:
   void SetUp() override {
-    Paths::Get().set_cache_temp_source(cache_source.path);
+    source = GetEmmcTargetString(from_testdata_base("boot.img"));
+    ASSERT_FALSE(source.empty());
+
+    std::string recovery_file = from_testdata_base("recovery.img");
+    recovery = GetEmmcTargetString(recovery_file);
+    ASSERT_FALSE(recovery.empty());
+
+    ASSERT_TRUE(android::base::WriteStringToFile("", patched_file_.path));
+    target = GetEmmcTargetString(recovery_file, patched_file_.path);
+    ASSERT_FALSE(target.empty());
+
+    Paths::Get().set_cache_temp_source(cache_source_.path);
   }
 
-  TemporaryFile cache_source;
+  std::string source;
+  std::string target;
+  std::string recovery;
+
+ private:
+  TemporaryFile cache_source_;
+  TemporaryFile patched_file_;
 };
 
+static int InvokeApplyPatchModes(const std::vector<std::string>& args) {
+  auto args_to_call = StringVectorToNullTerminatedArray(args);
+  return applypatch_modes(args_to_call.size() - 1, args_to_call.data());
+}
+
+static void VerifyPatchedTarget(const std::string& target) {
+  std::vector<std::string> pieces = android::base::Split(target, ":");
+  ASSERT_EQ(4, pieces.size());
+  ASSERT_EQ("EMMC", pieces[0]);
+
+  std::string patched_emmc = GetEmmcTargetString(pieces[1]);
+  ASSERT_FALSE(patched_emmc.empty());
+  ASSERT_EQ(target, patched_emmc);
+}
+
 TEST_F(ApplyPatchModesTest, InvalidArgs) {
   // At least two args (including the filename).
-  ASSERT_EQ(2, applypatch_modes(1, (const char* []){ "applypatch" }));
+  ASSERT_EQ(2, InvokeApplyPatchModes({ "applypatch" }));
 
   // Unrecognized args.
-  ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-x" }));
+  ASSERT_EQ(2, InvokeApplyPatchModes({ "applypatch", "-x" }));
 }
 
 TEST_F(ApplyPatchModesTest, PatchModeEmmcTarget) {
-  std::string boot_img = from_testdata_base("boot.img");
-  size_t boot_img_size;
-  std::string boot_img_sha1;
-  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
-
-  std::string recovery_img = from_testdata_base("recovery.img");
-  size_t recovery_img_size;
-  std::string recovery_img_sha1;
-  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
-  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
-
-  std::string bonus_file = from_testdata_base("bonus.file");
-
-  // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
-  std::string src_file_arg =
-      "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
-  TemporaryFile tgt_file;
-  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
-  std::string patch_arg = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
-  std::vector<const char*> args = { "applypatch",
-                                    "-b",
-                                    bonus_file.c_str(),
-                                    src_file_arg.c_str(),
-                                    tgt_file_arg.c_str(),
-                                    recovery_img_sha1.c_str(),
-                                    recovery_img_size_arg.c_str(),
-                                    patch_arg.c_str() };
-  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
+  std::vector<std::string> args{
+    "applypatch",
+    "--bonus",
+    from_testdata_base("bonus.file"),
+    "--patch",
+    from_testdata_base("recovery-from-boot.p"),
+    "--target",
+    target,
+    "--source",
+    source,
+  };
+  ASSERT_EQ(0, InvokeApplyPatchModes(args));
+  VerifyPatchedTarget(target);
 }
 
-// Tests patching the EMMC target without a separate bonus file (i.e. recovery-from-boot patch has
+// Tests patching an eMMC target without a separate bonus file (i.e. recovery-from-boot patch has
 // everything).
 TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithoutBonusFile) {
-  std::string boot_img = from_testdata_base("boot.img");
-  size_t boot_img_size;
-  std::string boot_img_sha1;
-  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
+  std::vector<std::string> args{
+    "applypatch", "--patch", from_testdata_base("recovery-from-boot-with-bonus.p"),
+    "--target",   target,    "--source",
+    source,
+  };
 
-  std::string recovery_img = from_testdata_base("recovery.img");
-  size_t recovery_img_size;
-  std::string recovery_img_sha1;
-  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
-  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
-
-  // applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
-  std::string src_file_arg =
-      "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
-  TemporaryFile tgt_file;
-  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
-  std::string patch_arg =
-      boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
-  std::vector<const char*> args = { "applypatch",
-                                    src_file_arg.c_str(),
-                                    tgt_file_arg.c_str(),
-                                    recovery_img_sha1.c_str(),
-                                    recovery_img_size_arg.c_str(),
-                                    patch_arg.c_str() };
-
-  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
-}
-
-TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithMultiplePatches) {
-  std::string boot_img = from_testdata_base("boot.img");
-  size_t boot_img_size;
-  std::string boot_img_sha1;
-  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
-
-  std::string recovery_img = from_testdata_base("recovery.img");
-  size_t recovery_img_size;
-  std::string recovery_img_sha1;
-  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
-  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
-
-  std::string bonus_file = from_testdata_base("bonus.file");
-
-  // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> \
-  //            <src-sha1-fake1>:<patch1> <src-sha1>:<patch2> <src-sha1-fake2>:<patch3>
-  std::string src_file_arg =
-      "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
-  TemporaryFile tgt_file;
-  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
-  std::string bad_sha1_a = android::base::StringPrintf("%040x", rand());
-  std::string bad_sha1_b = android::base::StringPrintf("%040x", rand());
-  std::string patch1 = bad_sha1_a + ":" + from_testdata_base("recovery-from-boot.p");
-  std::string patch2 = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
-  std::string patch3 = bad_sha1_b + ":" + from_testdata_base("recovery-from-boot.p");
-  std::vector<const char*> args = { "applypatch",
-                                    "-b",
-                                    bonus_file.c_str(),
-                                    src_file_arg.c_str(),
-                                    tgt_file_arg.c_str(),
-                                    recovery_img_sha1.c_str(),
-                                    recovery_img_size_arg.c_str(),
-                                    patch1.c_str(),
-                                    patch2.c_str(),
-                                    patch3.c_str() };
-
-  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
+  ASSERT_EQ(0, InvokeApplyPatchModes(args));
+  VerifyPatchedTarget(target);
 }
 
 // Ensures that applypatch works with a bsdiff based recovery-from-boot.p.
 TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithBsdiffPatch) {
-  std::string boot_img_file = from_testdata_base("boot.img");
-  std::string boot_img_sha1;
-  size_t boot_img_size;
-  sha1sum(boot_img_file, &boot_img_sha1, &boot_img_size);
-
-  std::string recovery_img_file = from_testdata_base("recovery.img");
-  std::string recovery_img_sha1;
-  size_t recovery_img_size;
-  sha1sum(recovery_img_file, &recovery_img_sha1, &recovery_img_size);
-
   // Generate the bsdiff patch of recovery-from-boot.p.
   std::string src_content;
-  ASSERT_TRUE(android::base::ReadFileToString(boot_img_file, &src_content));
+  ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("boot.img"), &src_content));
 
   std::string tgt_content;
-  ASSERT_TRUE(android::base::ReadFileToString(recovery_img_file, &tgt_content));
+  ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("recovery.img"), &tgt_content));
 
   TemporaryFile patch_file;
   ASSERT_EQ(0,
@@ -192,92 +145,55 @@
                            reinterpret_cast<const uint8_t*>(tgt_content.data()), tgt_content.size(),
                            patch_file.path, nullptr));
 
-  // applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
-  std::string src_file_arg =
-      "EMMC:" + boot_img_file + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
-  TemporaryFile tgt_file;
-  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
-  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
-  std::string patch_arg = boot_img_sha1 + ":" + patch_file.path;
-  std::vector<const char*> args = { "applypatch",
-                                    src_file_arg.c_str(),
-                                    tgt_file_arg.c_str(),
-                                    recovery_img_sha1.c_str(),
-                                    recovery_img_size_arg.c_str(),
-                                    patch_arg.c_str() };
-  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
-
-  // Double check the patched recovery image.
-  std::string tgt_file_sha1;
-  size_t tgt_file_size;
-  sha1sum(tgt_file.path, &tgt_file_sha1, &tgt_file_size);
-  ASSERT_EQ(recovery_img_size, tgt_file_size);
-  ASSERT_EQ(recovery_img_sha1, tgt_file_sha1);
+  std::vector<std::string> args{
+    "applypatch", "--patch", patch_file.path, "--target", target, "--source", source,
+  };
+  ASSERT_EQ(0, InvokeApplyPatchModes(args));
+  VerifyPatchedTarget(target);
 }
 
 TEST_F(ApplyPatchModesTest, PatchModeInvalidArgs) {
   // Invalid bonus file.
-  ASSERT_NE(0, applypatch_modes(3, (const char* []){ "applypatch", "-b", "/doesntexist" }));
+  std::vector<std::string> args{
+    "applypatch", "--bonus", "/doesntexist", "--patch", from_testdata_base("recovery-from-boot.p"),
+    "--target",   target,    "--source",     source,
+  };
+  ASSERT_NE(0, InvokeApplyPatchModes(args));
 
-  std::string bonus_file = from_testdata_base("bonus.file");
   // With bonus file, but missing args.
-  ASSERT_EQ(2, applypatch_modes(3, (const char* []){ "applypatch", "-b", bonus_file.c_str() }));
+  ASSERT_NE(0,
+            InvokeApplyPatchModes({ "applypatch", "--bonus", from_testdata_base("bonus.file") }));
+}
 
-  std::string boot_img = from_testdata_base("boot.img");
-  size_t boot_img_size;
-  std::string boot_img_sha1;
-  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
-
-  std::string recovery_img = from_testdata_base("recovery.img");
-  size_t size;
-  std::string recovery_img_sha1;
-  sha1sum(recovery_img, &recovery_img_sha1, &size);
-  std::string recovery_img_size = std::to_string(size);
-
-  // Bonus file is not supported in flash mode.
-  // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size>
-  TemporaryFile tmp4;
-  std::vector<const char*> args4 = {
-    "applypatch",
-    "-b",
-    bonus_file.c_str(),
-    boot_img.c_str(),
-    tmp4.path,
-    recovery_img_sha1.c_str(),
-    recovery_img_size.c_str(),
+TEST_F(ApplyPatchModesTest, FlashMode) {
+  std::vector<std::string> args{
+    "applypatch", "--flash", from_testdata_base("recovery.img"), "--target", target,
   };
-  ASSERT_NE(0, applypatch_modes(args4.size(), args4.data()));
+  ASSERT_EQ(0, InvokeApplyPatchModes(args));
+  VerifyPatchedTarget(target);
+}
 
-  // Failed to parse patch args.
-  TemporaryFile tmp5;
-  std::string bad_arg1 =
-      "invalid-sha1:filename" + from_testdata_base("recovery-from-boot-with-bonus.p");
-  std::vector<const char*> args5 = {
-    "applypatch",
-    boot_img.c_str(),
-    tmp5.path,
-    recovery_img_sha1.c_str(),
-    recovery_img_size.c_str(),
-    bad_arg1.c_str(),
+TEST_F(ApplyPatchModesTest, FlashModeInvalidArgs) {
+  std::vector<std::string> args{
+    "applypatch", "--bonus", from_testdata_base("bonus.file"), "--flash", source,
+    "--target",   target,
   };
-  ASSERT_NE(0, applypatch_modes(args5.size(), args5.data()));
+  ASSERT_NE(0, InvokeApplyPatchModes(args));
+}
 
-  // Target size cannot be zero.
-  TemporaryFile tmp6;
-  std::string patch = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
-  std::vector<const char*> args6 = {
-    "applypatch",  boot_img.c_str(), tmp6.path, recovery_img_sha1.c_str(),
-    "0",  // target size
-    patch.c_str(),
-  };
-  ASSERT_NE(0, applypatch_modes(args6.size(), args6.data()));
+TEST_F(ApplyPatchModesTest, CheckMode) {
+  ASSERT_EQ(0, InvokeApplyPatchModes({ "applypatch", "--check", recovery }));
+  ASSERT_EQ(0, InvokeApplyPatchModes({ "applypatch", "--check", source }));
 }
 
 TEST_F(ApplyPatchModesTest, CheckModeInvalidArgs) {
-  // Insufficient args.
-  ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-c" }));
+  ASSERT_EQ(2, InvokeApplyPatchModes({ "applypatch", "--check" }));
+}
+
+TEST_F(ApplyPatchModesTest, CheckModeNonEmmcTarget) {
+  ASSERT_NE(0, InvokeApplyPatchModes({ "applypatch", "--check", from_testdata_base("boot.img") }));
 }
 
 TEST_F(ApplyPatchModesTest, ShowLicenses) {
-  ASSERT_EQ(0, applypatch_modes(2, (const char* []){ "applypatch", "-l" }));
+  ASSERT_EQ(0, InvokeApplyPatchModes({ "applypatch", "--license" }));
 }