test/c/std/crc32.c - third_party/wuffs - Git at Google

 // Copyright 2018 The Wuffs Authors.
 //
 // 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
 //
 //    https://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.

 // ----------------

 /*
 This test program is typically run indirectly, by the "wuffs test" or "wuffs
 bench" commands. These commands take an optional "-mimic" flag to check that
 Wuffs' output mimics (i.e. exactly matches) other libraries' output, such as
 giflib for GIF, libpng for PNG, etc.

 To manually run this test:

 for CC in clang gcc; do
   $CC -std=c99 -Wall -Werror crc32.c && ./a.out
   rm -f a.out
 done

 Each edition should print "PASS", amongst other information, and exit(0).

 Add the "wuffs mimic cflags" (everything after the colon below) to the C
 compiler flags (after the .c file) to run the mimic tests.

 To manually run the benchmarks, replace "-Wall -Werror" with "-O3" and replace
 the first "./a.out" with "./a.out -bench". Combine these changes with the
 "wuffs mimic cflags" to run the mimic benchmarks.
 */

 // ¿ wuffs mimic cflags: -DWUFFS_MIMIC -ldeflate -lz

 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
 //
 // To use that single file as a "foo.c"-like implementation, instead of a
 // "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
 // compiling it.
 #define WUFFS_IMPLEMENTATION

 // Defining the WUFFS_CONFIG__MODULE* macros are optional, but it lets users of
 // release/c/etc.c choose which parts of Wuffs to build. That file contains the
 // entire Wuffs standard library, implementing a variety of codecs and file
 // formats. Without this macro definition, an optimizing compiler or linker may
 // very well discard Wuffs code for unused codecs, but listing the Wuffs
 // modules we use makes that process explicit. Preprocessing means that such
 // code simply isn't compiled.
 #define WUFFS_CONFIG__MODULES
 #define WUFFS_CONFIG__MODULE__BASE
 #define WUFFS_CONFIG__MODULE__CRC32

 // If building this program in an environment that doesn't easily accommodate
 // relative includes, you can use the script/inline-c-relative-includes.go
 // program to generate a stand-alone C file.
 #include "../../../release/c/wuffs-unsupported-snapshot.c"
 #include "../testlib/testlib.c"
 #ifdef WUFFS_MIMIC
 #include "../mimiclib/deflate-gzip-zlib.c"
 #endif

 // ---------------- Golden Tests

 golden_test g_crc32_midsummer_gt = {
     .src_filename = "test/data/midsummer.txt",
 };

 golden_test g_crc32_pi_gt = {
     .src_filename = "test/data/pi.txt",
 };

 // ---------------- CRC32 Tests

 const char*  //
 test_wuffs_crc32_ieee_interface() {
   CHECK_FOCUS(__func__);
   wuffs_crc32__ieee_hasher h;
   CHECK_STATUS("initialize",
                wuffs_crc32__ieee_hasher__initialize(
                    &h, sizeof h, WUFFS_VERSION,
                    WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
   return do_test__wuffs_base__hasher_u32(
       wuffs_crc32__ieee_hasher__upcast_as__wuffs_base__hasher_u32(&h),
       "test/data/hat.lossy.webp", 0, SIZE_MAX, 0x89F53B4E);
 }

 const char*  //
 test_wuffs_crc32_ieee_golden() {
   CHECK_FOCUS(__func__);

   struct {
     const char* filename;
     // The want values are determined by script/checksum.go.
     uint32_t want;
   } test_cases[] = {
       {
           .filename = "test/data/hat.bmp",
           .want = 0xA95A578B,
       },
       {
           .filename = "test/data/hat.gif",
           .want = 0xD9743B6A,
       },
       {
           .filename = "test/data/hat.jpeg",
           .want = 0x7F1A90CD,
       },
       {
           .filename = "test/data/hat.lossless.webp",
           .want = 0x485AA040,
       },
       {
           .filename = "test/data/hat.lossy.webp",
           .want = 0x89F53B4E,
       },
       {
           .filename = "test/data/hat.png",
           .want = 0xD5DA5C2F,
       },
       {
           .filename = "test/data/hat.tiff",
           .want = 0xBEF54503,
       },
   };

   for (size_t tc = 0; tc < WUFFS_TESTLIB_ARRAY_SIZE(test_cases); tc++) {
     wuffs_base__io_buffer src = ((wuffs_base__io_buffer){
         .data = g_src_slice_u8,
     });
     CHECK_STRING(read_file(&src, test_cases[tc].filename));

     for (int j = 0; j < 2; j++) {
       wuffs_crc32__ieee_hasher checksum;
       CHECK_STATUS("initialize",
                    wuffs_crc32__ieee_hasher__initialize(
                        &checksum, sizeof checksum, WUFFS_VERSION,
                        WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));

       uint32_t have = 0;
       size_t num_fragments = 0;
       size_t num_bytes = 0;
       do {
         wuffs_base__slice_u8 data = ((wuffs_base__slice_u8){
             .ptr = src.data.ptr + num_bytes,
             .len = src.meta.wi - num_bytes,
         });
         size_t limit = 101 + 103 * num_fragments;
         if ((j > 0) && (data.len > limit)) {
           data.len = limit;
         }
         have = wuffs_crc32__ieee_hasher__update_u32(&checksum, data);
         num_fragments++;
         num_bytes += data.len;
       } while (num_bytes < src.meta.wi);

       if (have != test_cases[tc].want) {
         RETURN_FAIL("tc=%zu, j=%d, filename=\"%s\": have 0x%08" PRIX32
                     ", want 0x%08" PRIX32,
                     tc, j, test_cases[tc].filename, have, test_cases[tc].want);
       }
     }
   }
   return NULL;
 }

 const char*  //
 do_test_xxxxx_crc32_ieee_pi(bool mimic) {
   const char* digits =
       "3."
       "141592653589793238462643383279502884197169399375105820974944592307816406"
       "2862089986280348253421170";
   if (strlen(digits) != 99) {
     RETURN_FAIL("strlen(digits): have %d, want 99", (int)(strlen(digits)));
   }

   // The want values are determined by script/checksum.go.
   //
   // wants[i] is the checksum of the first i bytes of the digits string.
   uint32_t wants[100] = {
       0x00000000, 0x6DD28E9B, 0x69647A00, 0x83B58BCD, 0x16E010BE, 0xAF13912C,
       0xB6C654DC, 0x02D43F2E, 0xC60167FD, 0xDE72F5D2, 0xECB2EAA3, 0x22E1CE23,
       0x26F4BB12, 0x099FD2E0, 0x2D041A2F, 0xC14373C1, 0x61A5D6D0, 0xEB60F999,
       0x93EDF514, 0x779BB713, 0x7EC98D7A, 0x43184A97, 0x739064B9, 0xA81B2541,
       0x1CCB1037, 0x4B177527, 0xC8932C85, 0xF0C86A18, 0xE99C072F, 0xC6EA2FC5,
       0xF11D621D, 0x09483B39, 0xD20BA7B6, 0xA66136B0, 0x3F1C0D9B, 0x7D37E8CC,
       0x68AFEE60, 0xB7DA99A5, 0x55BD96C6, 0xF18E35A4, 0x5C4D8E41, 0x6B38760A,
       0x63623EDF, 0x0BB7D76F, 0x5001AC9B, 0x0A5FC5FB, 0xA76213D4, 0x0C1E135B,
       0x916718F4, 0xD0FE1B9F, 0xE4D15B60, 0xCE8A5FB4, 0x381922EB, 0xB351097C,
       0xA3003B0D, 0x64C7C28B, 0x8ED5424B, 0x6C872ADF, 0x7CBF02ED, 0x2D713AFF,
       0xA028F932, 0x3BC16241, 0xF256AB5C, 0xE69E60DA, 0xEBE7C22F, 0xB1EF6496,
       0x740F578E, 0xFEAF7E51, 0x762D849E, 0xEDC1C4D4, 0x028F38BE, 0x31636BA7,
       0xBB354E18, 0xE70C7239, 0x425AFE6E, 0xB09DA8AC, 0x25D02578, 0x4343533F,
       0xACF0D063, 0x20CC1F13, 0x7E9EDAD2, 0xE5A44AA7, 0xC550F584, 0x101040DF,
       0x0BC4A511, 0x706E5A5A, 0x71CE81A3, 0xBB75E3F2, 0x3EDA6848, 0x8B8F08F2,
       0xA9384B2B, 0xB6C07F06, 0x6D644EE4, 0xCAD8CCB4, 0x3F70B461, 0x205F9F77,
       0x4D9D54B7, 0xD69454CC, 0xF8BB504D, 0xFC4E595C,
   };

   for (int i = 0; i < 100; i++) {
     uint32_t have;
     wuffs_base__slice_u8 data = ((wuffs_base__slice_u8){
         .ptr = (uint8_t*)(digits),
         .len = i,
     });

     if (mimic) {
       // A simple, slow CRC-32 IEEE implementation, 1 bit at a time.
       have = 0xFFFFFFFF;
       while (data.len--) {
         uint8_t byte = *data.ptr++;
         for (int i = 0; i < 8; i++) {
           if ((have ^ byte) & 1) {
             have = (have >> 1) ^ 0xEDB88320;
           } else {
             have = (have >> 1);
           }
           byte >>= 1;
         }
       }
       have ^= 0xFFFFFFFF;

     } else {
       wuffs_crc32__ieee_hasher checksum;
       CHECK_STATUS("initialize",
                    wuffs_crc32__ieee_hasher__initialize(
                        &checksum, sizeof checksum, WUFFS_VERSION,
                        WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
       have = wuffs_crc32__ieee_hasher__update_u32(&checksum, data);
     }

     if (have != wants[i]) {
       RETURN_FAIL("i=%d: have 0x%08" PRIX32 ", want 0x%08" PRIX32, i, have,
                   wants[i]);
     }
   }
   return NULL;
 }

 const char*  //
 test_wuffs_crc32_ieee_pi() {
   CHECK_FOCUS(__func__);
   return do_test_xxxxx_crc32_ieee_pi(false);
 }

 // ---------------- Mimic Tests

 #ifdef WUFFS_MIMIC

 const char*  //
 test_mimic_crc32_ieee_pi() {
   CHECK_FOCUS(__func__);
   return do_test_xxxxx_crc32_ieee_pi(true);
 }

 #endif  // WUFFS_MIMIC

 // ---------------- CRC32 Benches

 uint32_t g_wuffs_crc32_unused_u32;

 const char*  //
 wuffs_bench_crc32_ieee(wuffs_base__io_buffer* dst,
                        wuffs_base__io_buffer* src,
                        uint32_t wuffs_initialize_flags,
                        uint64_t wlimit,
                        uint64_t rlimit) {
   uint64_t len = src->meta.wi - src->meta.ri;
   if (rlimit) {
     len = wuffs_base__u64__min(len, rlimit);
   }
   wuffs_crc32__ieee_hasher checksum;
   CHECK_STATUS("initialize", wuffs_crc32__ieee_hasher__initialize(
                                  &checksum, sizeof checksum, WUFFS_VERSION,
                                  wuffs_initialize_flags));
   g_wuffs_crc32_unused_u32 = wuffs_crc32__ieee_hasher__update_u32(
       &checksum, ((wuffs_base__slice_u8){
                      .ptr = src->data.ptr + src->meta.ri,
                      .len = len,
                  }));
   src->meta.ri += len;
   return NULL;
 }

 const char*  //
 bench_wuffs_crc32_ieee_10k() {
   CHECK_FOCUS(__func__);
   return do_bench_io_buffers(
       wuffs_bench_crc32_ieee,
       WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED, tcounter_src,
       &g_crc32_midsummer_gt, UINT64_MAX, UINT64_MAX, 1500);
 }

 const char*  //
 bench_wuffs_crc32_ieee_100k() {
   CHECK_FOCUS(__func__);
   return do_bench_io_buffers(
       wuffs_bench_crc32_ieee,
       WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED, tcounter_src,
       &g_crc32_pi_gt, UINT64_MAX, UINT64_MAX, 150);
 }

 // ---------------- Mimic Benches

 #ifdef WUFFS_MIMIC

 const char*  //
 bench_mimic_crc32_ieee_10k() {
   CHECK_FOCUS(__func__);
   return do_bench_io_buffers(mimic_bench_crc32_ieee, 0, tcounter_src,
                              &g_crc32_midsummer_gt, UINT64_MAX, UINT64_MAX,
                              1500);
 }

 const char*  //
 bench_mimic_crc32_ieee_100k() {
   CHECK_FOCUS(__func__);
   return do_bench_io_buffers(mimic_bench_crc32_ieee, 0, tcounter_src,
                              &g_crc32_pi_gt, UINT64_MAX, UINT64_MAX, 150);
 }

 #endif  // WUFFS_MIMIC

 // ---------------- Manifest

 // Note that the crc32 mimic tests and benches don't work with
 // WUFFS_MIMICLIB_USE_MINIZ_INSTEAD_OF_ZLIB.

 proc g_tests[] = {

     test_wuffs_crc32_ieee_golden,
     test_wuffs_crc32_ieee_interface,
     test_wuffs_crc32_ieee_pi,

 #ifdef WUFFS_MIMIC

     test_mimic_crc32_ieee_pi,

 #endif  // WUFFS_MIMIC

     NULL,
 };

 proc g_benches[] = {

     bench_wuffs_crc32_ieee_10k,
     bench_wuffs_crc32_ieee_100k,

 #ifdef WUFFS_MIMIC

     bench_mimic_crc32_ieee_10k,
     bench_mimic_crc32_ieee_100k,

 #endif  // WUFFS_MIMIC

     NULL,
 };

 int  //
 main(int argc, char** argv) {
   g_proc_package_name = "std/crc32";
   return test_main(argc, argv, g_tests, g_benches);
 }
	// Copyright 2018 The Wuffs Authors.
	//
	// 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
	//
	// https://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.

	// ----------------

	/*
	This test program is typically run indirectly, by the "wuffs test" or "wuffs
	bench" commands. These commands take an optional "-mimic" flag to check that
	Wuffs' output mimics (i.e. exactly matches) other libraries' output, such as
	giflib for GIF, libpng for PNG, etc.

	To manually run this test:

	for CC in clang gcc; do
	$CC -std=c99 -Wall -Werror crc32.c && ./a.out
	rm -f a.out
	done

	Each edition should print "PASS", amongst other information, and exit(0).

	Add the "wuffs mimic cflags" (everything after the colon below) to the C
	compiler flags (after the .c file) to run the mimic tests.

	To manually run the benchmarks, replace "-Wall -Werror" with "-O3" and replace
	the first "./a.out" with "./a.out -bench". Combine these changes with the
	"wuffs mimic cflags" to run the mimic benchmarks.
	*/

	// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -ldeflate -lz

	// Wuffs ships as a "single file C library" or "header file library" as per
	// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
	//
	// To use that single file as a "foo.c"-like implementation, instead of a
	// "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
	// compiling it.
	#define WUFFS_IMPLEMENTATION

	// Defining the WUFFS_CONFIG__MODULE* macros are optional, but it lets users of
	// release/c/etc.c choose which parts of Wuffs to build. That file contains the
	// entire Wuffs standard library, implementing a variety of codecs and file
	// formats. Without this macro definition, an optimizing compiler or linker may
	// very well discard Wuffs code for unused codecs, but listing the Wuffs
	// modules we use makes that process explicit. Preprocessing means that such
	// code simply isn't compiled.
	#define WUFFS_CONFIG__MODULES
	#define WUFFS_CONFIG__MODULE__BASE
	#define WUFFS_CONFIG__MODULE__CRC32

	// If building this program in an environment that doesn't easily accommodate
	// relative includes, you can use the script/inline-c-relative-includes.go
	// program to generate a stand-alone C file.
	#include "../../../release/c/wuffs-unsupported-snapshot.c"
	#include "../testlib/testlib.c"
	#ifdef WUFFS_MIMIC
	#include "../mimiclib/deflate-gzip-zlib.c"
	#endif

	// ---------------- Golden Tests

	golden_test g_crc32_midsummer_gt = {
	.src_filename = "test/data/midsummer.txt",
	};

	golden_test g_crc32_pi_gt = {
	.src_filename = "test/data/pi.txt",
	};

	// ---------------- CRC32 Tests

	const char* //
	test_wuffs_crc32_ieee_interface() {
	CHECK_FOCUS(__func__);
	wuffs_crc32__ieee_hasher h;
	CHECK_STATUS("initialize",
	wuffs_crc32__ieee_hasher__initialize(
	&h, sizeof h, WUFFS_VERSION,
	WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
	return do_test__wuffs_base__hasher_u32(
	wuffs_crc32__ieee_hasher__upcast_as__wuffs_base__hasher_u32(&h),
	"test/data/hat.lossy.webp", 0, SIZE_MAX, 0x89F53B4E);
	}

	const char* //
	test_wuffs_crc32_ieee_golden() {
	CHECK_FOCUS(__func__);

	struct {
	const char* filename;
	// The want values are determined by script/checksum.go.
	uint32_t want;
	} test_cases[] = {
	{
	.filename = "test/data/hat.bmp",
	.want = 0xA95A578B,
	},
	{
	.filename = "test/data/hat.gif",
	.want = 0xD9743B6A,
	},
	{
	.filename = "test/data/hat.jpeg",
	.want = 0x7F1A90CD,
	},
	{
	.filename = "test/data/hat.lossless.webp",
	.want = 0x485AA040,
	},
	{
	.filename = "test/data/hat.lossy.webp",
	.want = 0x89F53B4E,
	},
	{
	.filename = "test/data/hat.png",
	.want = 0xD5DA5C2F,
	},
	{
	.filename = "test/data/hat.tiff",
	.want = 0xBEF54503,
	},
	};

	for (size_t tc = 0; tc < WUFFS_TESTLIB_ARRAY_SIZE(test_cases); tc++) {
	wuffs_base__io_buffer src = ((wuffs_base__io_buffer){
	.data = g_src_slice_u8,
	});
	CHECK_STRING(read_file(&src, test_cases[tc].filename));

	for (int j = 0; j < 2; j++) {
	wuffs_crc32__ieee_hasher checksum;
	CHECK_STATUS("initialize",
	wuffs_crc32__ieee_hasher__initialize(
	&checksum, sizeof checksum, WUFFS_VERSION,
	WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));

	uint32_t have = 0;
	size_t num_fragments = 0;
	size_t num_bytes = 0;
	do {
	wuffs_base__slice_u8 data = ((wuffs_base__slice_u8){
	.ptr = src.data.ptr + num_bytes,
	.len = src.meta.wi - num_bytes,
	});
	size_t limit = 101 + 103 * num_fragments;
	if ((j > 0) && (data.len > limit)) {
	data.len = limit;
	}
	have = wuffs_crc32__ieee_hasher__update_u32(&checksum, data);
	num_fragments++;
	num_bytes += data.len;
	} while (num_bytes < src.meta.wi);

	if (have != test_cases[tc].want) {
	RETURN_FAIL("tc=%zu, j=%d, filename=\"%s\": have 0x%08" PRIX32
	", want 0x%08" PRIX32,
	tc, j, test_cases[tc].filename, have, test_cases[tc].want);
	}
	}
	}
	return NULL;
	}

	const char* //
	do_test_xxxxx_crc32_ieee_pi(bool mimic) {
	const char* digits =
	"3."
	"141592653589793238462643383279502884197169399375105820974944592307816406"
	"2862089986280348253421170";
	if (strlen(digits) != 99) {
	RETURN_FAIL("strlen(digits): have %d, want 99", (int)(strlen(digits)));
	}

	// The want values are determined by script/checksum.go.
	//
	// wants[i] is the checksum of the first i bytes of the digits string.
	uint32_t wants[100] = {
	0x00000000, 0x6DD28E9B, 0x69647A00, 0x83B58BCD, 0x16E010BE, 0xAF13912C,
	0xB6C654DC, 0x02D43F2E, 0xC60167FD, 0xDE72F5D2, 0xECB2EAA3, 0x22E1CE23,
	0x26F4BB12, 0x099FD2E0, 0x2D041A2F, 0xC14373C1, 0x61A5D6D0, 0xEB60F999,
	0x93EDF514, 0x779BB713, 0x7EC98D7A, 0x43184A97, 0x739064B9, 0xA81B2541,
	0x1CCB1037, 0x4B177527, 0xC8932C85, 0xF0C86A18, 0xE99C072F, 0xC6EA2FC5,
	0xF11D621D, 0x09483B39, 0xD20BA7B6, 0xA66136B0, 0x3F1C0D9B, 0x7D37E8CC,
	0x68AFEE60, 0xB7DA99A5, 0x55BD96C6, 0xF18E35A4, 0x5C4D8E41, 0x6B38760A,
	0x63623EDF, 0x0BB7D76F, 0x5001AC9B, 0x0A5FC5FB, 0xA76213D4, 0x0C1E135B,
	0x916718F4, 0xD0FE1B9F, 0xE4D15B60, 0xCE8A5FB4, 0x381922EB, 0xB351097C,
	0xA3003B0D, 0x64C7C28B, 0x8ED5424B, 0x6C872ADF, 0x7CBF02ED, 0x2D713AFF,
	0xA028F932, 0x3BC16241, 0xF256AB5C, 0xE69E60DA, 0xEBE7C22F, 0xB1EF6496,
	0x740F578E, 0xFEAF7E51, 0x762D849E, 0xEDC1C4D4, 0x028F38BE, 0x31636BA7,
	0xBB354E18, 0xE70C7239, 0x425AFE6E, 0xB09DA8AC, 0x25D02578, 0x4343533F,
	0xACF0D063, 0x20CC1F13, 0x7E9EDAD2, 0xE5A44AA7, 0xC550F584, 0x101040DF,
	0x0BC4A511, 0x706E5A5A, 0x71CE81A3, 0xBB75E3F2, 0x3EDA6848, 0x8B8F08F2,
	0xA9384B2B, 0xB6C07F06, 0x6D644EE4, 0xCAD8CCB4, 0x3F70B461, 0x205F9F77,
	0x4D9D54B7, 0xD69454CC, 0xF8BB504D, 0xFC4E595C,
	};

	for (int i = 0; i < 100; i++) {
	uint32_t have;
	wuffs_base__slice_u8 data = ((wuffs_base__slice_u8){
	.ptr = (uint8_t*)(digits),
	.len = i,
	});

	if (mimic) {
	// A simple, slow CRC-32 IEEE implementation, 1 bit at a time.
	have = 0xFFFFFFFF;
	while (data.len--) {
	uint8_t byte = *data.ptr++;
	for (int i = 0; i < 8; i++) {
	if ((have ^ byte) & 1) {
	have = (have >> 1) ^ 0xEDB88320;
	} else {
	have = (have >> 1);
	}
	byte >>= 1;
	}
	}
	have ^= 0xFFFFFFFF;

	} else {
	wuffs_crc32__ieee_hasher checksum;
	CHECK_STATUS("initialize",
	wuffs_crc32__ieee_hasher__initialize(
	&checksum, sizeof checksum, WUFFS_VERSION,
	WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
	have = wuffs_crc32__ieee_hasher__update_u32(&checksum, data);
	}

	if (have != wants[i]) {
	RETURN_FAIL("i=%d: have 0x%08" PRIX32 ", want 0x%08" PRIX32, i, have,
	wants[i]);
	}
	}
	return NULL;
	}

	const char* //
	test_wuffs_crc32_ieee_pi() {
	CHECK_FOCUS(__func__);
	return do_test_xxxxx_crc32_ieee_pi(false);
	}

	// ---------------- Mimic Tests

	#ifdef WUFFS_MIMIC

	const char* //
	test_mimic_crc32_ieee_pi() {
	CHECK_FOCUS(__func__);
	return do_test_xxxxx_crc32_ieee_pi(true);
	}

	#endif // WUFFS_MIMIC

	// ---------------- CRC32 Benches

	uint32_t g_wuffs_crc32_unused_u32;

	const char* //
	wuffs_bench_crc32_ieee(wuffs_base__io_buffer* dst,
	wuffs_base__io_buffer* src,
	uint32_t wuffs_initialize_flags,
	uint64_t wlimit,
	uint64_t rlimit) {
	uint64_t len = src->meta.wi - src->meta.ri;
	if (rlimit) {
	len = wuffs_base__u64__min(len, rlimit);
	}
	wuffs_crc32__ieee_hasher checksum;
	CHECK_STATUS("initialize", wuffs_crc32__ieee_hasher__initialize(
	&checksum, sizeof checksum, WUFFS_VERSION,
	wuffs_initialize_flags));
	g_wuffs_crc32_unused_u32 = wuffs_crc32__ieee_hasher__update_u32(
	&checksum, ((wuffs_base__slice_u8){
	.ptr = src->data.ptr + src->meta.ri,
	.len = len,
	}));
	src->meta.ri += len;
	return NULL;
	}

	const char* //
	bench_wuffs_crc32_ieee_10k() {
	CHECK_FOCUS(__func__);
	return do_bench_io_buffers(
	wuffs_bench_crc32_ieee,
	WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED, tcounter_src,
	&g_crc32_midsummer_gt, UINT64_MAX, UINT64_MAX, 1500);
	}

	const char* //
	bench_wuffs_crc32_ieee_100k() {
	CHECK_FOCUS(__func__);
	return do_bench_io_buffers(
	wuffs_bench_crc32_ieee,
	WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED, tcounter_src,
	&g_crc32_pi_gt, UINT64_MAX, UINT64_MAX, 150);
	}

	// ---------------- Mimic Benches

	#ifdef WUFFS_MIMIC

	const char* //
	bench_mimic_crc32_ieee_10k() {
	CHECK_FOCUS(__func__);
	return do_bench_io_buffers(mimic_bench_crc32_ieee, 0, tcounter_src,
	&g_crc32_midsummer_gt, UINT64_MAX, UINT64_MAX,
	1500);
	}

	const char* //
	bench_mimic_crc32_ieee_100k() {
	CHECK_FOCUS(__func__);
	return do_bench_io_buffers(mimic_bench_crc32_ieee, 0, tcounter_src,
	&g_crc32_pi_gt, UINT64_MAX, UINT64_MAX, 150);
	}

	#endif // WUFFS_MIMIC

	// ---------------- Manifest

	// Note that the crc32 mimic tests and benches don't work with
	// WUFFS_MIMICLIB_USE_MINIZ_INSTEAD_OF_ZLIB.

	proc g_tests[] = {

	test_wuffs_crc32_ieee_golden,
	test_wuffs_crc32_ieee_interface,
	test_wuffs_crc32_ieee_pi,

	#ifdef WUFFS_MIMIC

	test_mimic_crc32_ieee_pi,

	#endif // WUFFS_MIMIC

	NULL,
	};

	proc g_benches[] = {

	bench_wuffs_crc32_ieee_10k,
	bench_wuffs_crc32_ieee_100k,

	#ifdef WUFFS_MIMIC

	bench_mimic_crc32_ieee_10k,
	bench_mimic_crc32_ieee_100k,

	#endif // WUFFS_MIMIC

	NULL,
	};

	int //
	main(int argc, char** argv) {
	g_proc_package_name = "std/crc32";
	return test_main(argc, argv, g_tests, g_benches);
	}