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+##
+## Copyright (c) 2017, Alliance for Open Media. All rights reserved
+##
+## This source code is subject to the terms of the BSD 2 Clause License and
+## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+## was not distributed with this source code in the LICENSE file, you can
+## obtain it at www.aomedia.org/license/software. If the Alliance for Open
+## Media Patent License 1.0 was not distributed with this source code in the
+## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+##
+
+# Parses test/test-data.sha1 and writes captured file names and checksums to
+# $out_files and $out_checksums as lists.
+function (make_test_data_lists out_files out_checksums)
+ if (NOT AOM_TEST_DATA_LIST OR NOT EXISTS "${AOM_TEST_DATA_LIST}")
+ message(FATAL_ERROR "AOM_TEST_DATA_LIST (${AOM_TEST_DATA_LIST}) missing or "
+ "variable empty.")
+ endif ()
+
+ # Read test-data.sha1 into $files_and_checksums. $files_and_checksums becomes
+ # a list with an entry for each line from $AOM_TEST_DATA_LIST.
+ file(STRINGS "${AOM_TEST_DATA_LIST}" files_and_checksums)
+
+ # Iterate over the list of lines and split it into $checksums and $filenames.
+ foreach (line ${files_and_checksums})
+ string(FIND "${line}" " *" delim_pos)
+
+ math(EXPR filename_pos "${delim_pos} + 2")
+ string(SUBSTRING "${line}" 0 ${delim_pos} checksum)
+ string(SUBSTRING "${line}" ${filename_pos} -1 filename)
+
+ set(checksums ${checksums} ${checksum})
+ set(filenames ${filenames} ${filename})
+ endforeach ()
+
+ if (NOT checksums OR NOT filenames)
+ message(FATAL_ERROR "Parsing of ${AOM_TEST_DATA_LIST} failed.")
+ endif ()
+
+ set(${out_checksums} ${checksums} PARENT_SCOPE)
+ set(${out_files} ${filenames} PARENT_SCOPE)
+endfunction ()
+
+# Appends each file name in $test_files to $test_dir and adds the result path to
+# $out_path_list.
+function (expand_test_file_paths test_files test_dir out_path_list)
+ foreach (filename ${${test_files}})
+ set(path_list ${path_list} "${test_dir}/${filename}")
+ endforeach ()
+ set(${out_path_list} ${path_list} PARENT_SCOPE)
+endfunction ()
+
+function (check_file local_path expected_checksum out_needs_update)
+ if (EXISTS "${local_path}")
+ file(SHA1 "${local_path}" file_checksum)
+ else ()
+ set(${out_needs_update} 1 PARENT_SCOPE)
+ return ()
+ endif ()
+
+ if ("${file_checksum}" STREQUAL "${expected_checksum}")
+ unset(${out_needs_update} PARENT_SCOPE)
+ else ()
+ set(${out_needs_update} 1 PARENT_SCOPE)
+ endif ()
+endfunction ()
+
+# Downloads data from $file_url, confirms that $file_checksum matches, and
+# writes it to $local_path.
+function (download_test_file file_url file_checksum local_path)
+ message("Downloading ${file_url} ...")
+ file(DOWNLOAD "${file_url}" "${local_path}"
+ SHOW_PROGRESS
+ EXPECTED_HASH SHA1=${file_checksum})
+ message("Download of ${file_url} complete.")
+endfunction ()