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// Copyright (c) 2017, Google Inc.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//go:build ignore
// embed_test_data generates a C++ source file which exports a function,
// GetTestData, which looks up the specified data files.
package main
import (
"bytes"
"flag"
"fmt"
"os"
"strings"
)
var fileList = flag.String("file-list", "", "if not empty, the path to a file containing a newline-separated list of files, to work around Windows command-line limits")
func quote(in []byte) string {
var lastWasHex bool
var buf bytes.Buffer
buf.WriteByte('"')
for _, b := range in {
var wasHex bool
switch b {
case '\a':
buf.WriteString(`\a`)
case '\b':
buf.WriteString(`\b`)
case '\f':
buf.WriteString(`\f`)
case '\n':
buf.WriteString(`\n`)
case '\r':
buf.WriteString(`\r`)
case '\t':
buf.WriteString(`\t`)
case '\v':
buf.WriteString(`\v`)
case '"':
buf.WriteString(`\"`)
case '\\':
buf.WriteString(`\\`)
default:
// Emit printable ASCII characters, [32, 126], as-is to minimize
// file size. However, if the previous character used a hex escape
// sequence, do not emit 0-9 and a-f as-is. C++ interprets "\x123"
// as a single (overflowing) escape sequence, rather than '\x12'
// followed by '3'.
isHexDigit := ('0' <= b && b <= '9') || ('a' <= b && b <= 'f') || ('A' <= b && b <= 'F')
if 32 <= b && b <= 126 && !(lastWasHex && isHexDigit) {
buf.WriteByte(b)
} else {
fmt.Fprintf(&buf, "\\x%02x", b)
wasHex = true
}
}
lastWasHex = wasHex
}
buf.WriteByte('"')
return buf.String()
}
func main() {
flag.Parse()
var files []string
if len(*fileList) != 0 {
data, err := os.ReadFile(*fileList)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading %s: %s.\n", *fileList, err)
os.Exit(1)
}
files = strings.FieldsFunc(string(data), func(r rune) bool { return r == '\r' || r == '\n' })
}
files = append(files, flag.Args()...)
fmt.Printf(`/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
/* This file is generated by:
`)
fmt.Printf(" * go run util/embed_test_data.go")
for _, arg := range files {
fmt.Printf(" \\\n * %s", arg)
}
fmt.Printf(" */\n")
fmt.Printf(`
/* clang-format off */
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <string>
`)
// MSVC limits the length of string constants, so we emit an array of
// them and concatenate at runtime. We could also use a single array
// literal, but this is less compact.
const chunkSize = 8192
for i, arg := range files {
data, err := os.ReadFile(arg)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading %s: %s.\n", arg, err)
os.Exit(1)
}
fmt.Printf("static const size_t kLen%d = %d;\n\n", i, len(data))
fmt.Printf("static const char *kData%d[] = {\n", i)
for len(data) > 0 {
chunk := chunkSize
if chunk > len(data) {
chunk = len(data)
}
fmt.Printf(" %s,\n", quote(data[:chunk]))
data = data[chunk:]
}
fmt.Printf("};\n")
}
fmt.Printf(`static std::string AssembleString(const char **data, size_t len) {
std::string ret;
for (size_t i = 0; i < len; i += %d) {
size_t chunk = std::min(static_cast<size_t>(%d), len - i);
ret.append(data[i / %d], chunk);
}
return ret;
}
/* Silence -Wmissing-declarations. */
std::string GetTestData(const char *path);
std::string GetTestData(const char *path) {
`, chunkSize, chunkSize, chunkSize)
for i, arg := range files {
fmt.Printf(" if (strcmp(path, %s) == 0) {\n", quote([]byte(arg)))
fmt.Printf(" return AssembleString(kData%d, kLen%d);\n", i, i)
fmt.Printf(" }\n")
}
fmt.Printf(` fprintf(stderr, "File not embedded: %%s.\n", path);
abort();
}
`)
}
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