Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
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194 lines
6.3 KiB
194 lines
6.3 KiB
2 years ago
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// Copyright 2022 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This program tests the absl::SimpleAtod and absl::SimpleAtof functions. Run
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// it as "atod_manual_test pnftd/data/*.txt" where the pnftd directory is a
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// local checkout of the https://github.com/nigeltao/parse-number-fxx-test-data
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// repository. The test suite lives in a separate repository because its more
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// than 5 million test cases weigh over several hundred megabytes and because
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// the test cases are also useful to other software projects, not just Abseil.
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// Its data/*.txt files contain one test case per line, like:
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//
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// 3C00 3F800000 3FF0000000000000 1
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// 3D00 3FA00000 3FF4000000000000 1.25
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// 3D9A 3FB33333 3FF6666666666666 1.4
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// 57B7 42F6E979 405EDD2F1A9FBE77 123.456
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// 622A 44454000 4088A80000000000 789
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// 7C00 7F800000 7FF0000000000000 123.456e789
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//
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// For each line (and using 0-based column indexes), columns [5..13] and
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// [14..30] contain the 32-bit float and 64-bit double result of parsing
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// columns [31..].
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//
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// For example, parsing "1.4" as a float gives the bits 0x3FB33333.
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//
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// In this 6-line example, the final line's float and double values are all
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// infinity. The largest finite float and double values are approximately
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// 3.40e+38 and 1.80e+308.
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#include <cstdint>
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#include <cstdio>
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#include <string>
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#include "absl/base/casts.h"
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_format.h"
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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static constexpr uint8_t kUnhex[256] = {
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, // '0' ..= '7'
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0x8, 0x9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // '8' ..= '9'
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0x0, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x0, // 'A' ..= 'F'
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
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};
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static absl::optional<std::string> ReadFileToString(const char* filename) {
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FILE* f = fopen(filename, "rb");
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if (!f) {
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return absl::nullopt;
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}
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fseek(f, 0, SEEK_END);
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size_t size = ftell(f);
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fseek(f, 0, SEEK_SET);
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std::string s(size, '\x00');
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size_t n = fread(&s[0], 1, size, f);
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fclose(f);
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if (n != size) {
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return absl::nullopt;
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}
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return s;
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}
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static bool ProcessOneTestFile(const char* filename) {
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absl::optional<std::string> contents = ReadFileToString(filename);
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if (!contents) {
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absl::FPrintF(stderr, "Invalid file: %s\n", filename);
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return false;
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}
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int num_cases = 0;
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for (absl::string_view v(*contents); !v.empty();) {
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size_t new_line = v.find('\n');
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if ((new_line == absl::string_view::npos) || (new_line < 32)) {
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break;
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}
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absl::string_view input = v.substr(31, new_line - 31);
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// Test absl::SimpleAtof.
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{
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float f;
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if (!absl::SimpleAtof(input, &f)) {
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absl::FPrintF(stderr, "Could not parse \"%s\" in %s\n", input,
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filename);
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return false;
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}
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uint32_t have32 = absl::bit_cast<uint32_t>(f);
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uint32_t want32 = 0;
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for (int i = 0; i < 8; i++) {
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want32 = (want32 << 4) | kUnhex[static_cast<unsigned char>(v[5 + i])];
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}
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if (have32 != want32) {
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absl::FPrintF(stderr,
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"absl::SimpleAtof failed parsing \"%s\" in %s\n have "
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"%08X\n want %08X\n",
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input, filename, have32, want32);
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return false;
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}
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}
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// Test absl::SimpleAtod.
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{
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double d;
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if (!absl::SimpleAtod(input, &d)) {
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absl::FPrintF(stderr, "Could not parse \"%s\" in %s\n", input,
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filename);
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return false;
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}
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uint64_t have64 = absl::bit_cast<uint64_t>(d);
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uint64_t want64 = 0;
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for (int i = 0; i < 16; i++) {
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want64 = (want64 << 4) | kUnhex[static_cast<unsigned char>(v[14 + i])];
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}
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if (have64 != want64) {
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absl::FPrintF(stderr,
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"absl::SimpleAtod failed parsing \"%s\" in %s\n have "
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"%016X\n want %016X\n",
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input, filename, have64, want64);
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return false;
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}
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}
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num_cases++;
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v = v.substr(new_line + 1);
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}
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printf("%8d OK in %s\n", num_cases, filename);
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return true;
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}
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int main(int argc, char** argv) {
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if (argc < 2) {
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absl::FPrintF(
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stderr,
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"Usage: %s pnftd/data/*.txt\nwhere the pnftd directory is a local "
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"checkout of "
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"the\nhttps://github.com/nigeltao/parse-number-fxx-test-data "
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"repository.\n",
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argv[0]);
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return 1;
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}
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for (int i = 1; i < argc; i++) {
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if (!ProcessOneTestFile(argv[i])) {
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return 1;
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}
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}
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return 0;
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}
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