n-api: add string api for latin1 encoding

PR-URL: nodejs#12368
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jason Ginchereau <jasongin@microsoft.com>

src/node_api.cc

@@ -1269,6 +1269,25 @@ napi_status napi_create_array_with_length(napi_env env,
   return GET_RETURN_STATUS(env);
 }
 
+napi_status napi_create_string_latin1(napi_env env,
+                                      const char* str,
+                                      size_t length,
+                                      napi_value* result) {
+  NAPI_PREAMBLE(env);
+  CHECK_ARG(env, result);
+
+  auto isolate = env->isolate;
+  auto str_maybe =
+      v8::String::NewFromOneByte(isolate,
+                                 reinterpret_cast<const uint8_t*>(str),
+                                 v8::NewStringType::kInternalized,
+                                 length);
+  CHECK_MAYBE_EMPTY(env, str_maybe, napi_generic_failure);
+
+  *result = v8impl::JsValueFromV8LocalValue(str_maybe.ToLocalChecked());
+  return GET_RETURN_STATUS(env);
+}
+
 napi_status napi_create_string_utf8(napi_env env,
                                     const char* str,
                                     size_t length,
@@ -1716,9 +1735,46 @@ napi_status napi_get_value_string_length(napi_env env,
   return GET_RETURN_STATUS(env);
 }
 
+// Copies a JavaScript string into a LATIN-1 string buffer. The result is the
+// number of bytes (excluding the null terminator) copied into buf.
+// A sufficient buffer size should be greater than the length of string,
+// reserving space for null terminator.
+// If bufsize is insufficient, the string will be truncated and null terminated.
+// If buf is NULL, this method returns the length of the string (in bytes)
+// via the result parameter.
+// The result argument is optional unless buf is NULL.
+napi_status napi_get_value_string_latin1(napi_env env,
+                                         napi_value value,
+                                         char* buf,
+                                         size_t bufsize,
+                                         size_t* result) {
+  NAPI_PREAMBLE(env);
+
+  v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);
+  RETURN_STATUS_IF_FALSE(env, val->IsString(), napi_string_expected);
+
+  if (!buf) {
+    CHECK_ARG(env, result);
+    *result = val.As<v8::String>()->Length();
+  } else {
+    int copied = val.As<v8::String>()->WriteOneByte(
+      reinterpret_cast<uint8_t*>(buf), 0, bufsize - 1,
+      v8::String::NO_NULL_TERMINATION);
+
+    buf[copied] = '\0';
+    if (result != nullptr) {
+      *result = copied;
+    }
+  }
+
+  return GET_RETURN_STATUS(env);
+}
+
 // Copies a JavaScript string into a UTF-8 string buffer. The result is the
-// number of bytes copied into buf, including the null terminator. If bufsize
-// is insufficient, the string will be truncated, including a null terminator.
+// number of bytes (excluding the null terminator) copied into buf.
+// A sufficient buffer size should be greater than the length of string,
+// reserving space for null terminator.
+// If bufsize is insufficient, the string will be truncated and null terminated.
 // If buf is NULL, this method returns the length of the string (in bytes)
 // via the result parameter.
 // The result argument is optional unless buf is NULL.
@@ -1737,8 +1793,10 @@ napi_status napi_get_value_string_utf8(napi_env env,
     *result = val.As<v8::String>()->Utf8Length();
   } else {
     int copied = val.As<v8::String>()->WriteUtf8(
-      buf, bufsize, nullptr, v8::String::REPLACE_INVALID_UTF8);
+      buf, bufsize - 1, nullptr, v8::String::REPLACE_INVALID_UTF8 |
+      v8::String::NO_NULL_TERMINATION);
 
+    buf[copied] = '\0';
     if (result != nullptr) {
       *result = copied;
     }
@@ -1748,10 +1806,12 @@ napi_status napi_get_value_string_utf8(napi_env env,
 }
 
 // Copies a JavaScript string into a UTF-16 string buffer. The result is the
-// number of 2-byte code units copied into buf, including the null terminator.
-// If bufsize is insufficient, the string will be truncated, including a null
-// terminator. If buf is NULL, this method returns the length of the string
-// (in 2-byte code units) via the result parameter.
+// number of 2-byte code units (excluding the null terminator) copied into buf.
+// A sufficient buffer size should be greater than the length of string,
+// reserving space for null terminator.
+// If bufsize is insufficient, the string will be truncated and null terminated.
+// If buf is NULL, this method returns the length of the string (in 2-byte
+// code units) via the result parameter.
 // The result argument is optional unless buf is NULL.
 napi_status napi_get_value_string_utf16(napi_env env,
                                         napi_value value,
@@ -1769,8 +1829,10 @@ napi_status napi_get_value_string_utf16(napi_env env,
     *result = val.As<v8::String>()->Length();
   } else {
     int copied = val.As<v8::String>()->Write(
-      reinterpret_cast<uint16_t*>(buf), 0, bufsize, v8::String::NO_OPTIONS);
+      reinterpret_cast<uint16_t*>(buf), 0, bufsize - 1,
+      v8::String::NO_NULL_TERMINATION);
 
+    buf[copied] = '\0';
     if (result != nullptr) {
       *result = copied;
     }

src/node_api.h

@@ -121,6 +121,10 @@ NAPI_EXTERN napi_status napi_create_array_with_length(napi_env env,
 NAPI_EXTERN napi_status napi_create_number(napi_env env,
                                            double value,
                                            napi_value* result);
+NAPI_EXTERN napi_status napi_create_string_latin1(napi_env env,
+                                                  const char* str,
+                                                  size_t length,
+                                                  napi_value* result);
 NAPI_EXTERN napi_status napi_create_string_utf8(napi_env env,
                                                 const char* str,
                                                 size_t length,
@@ -172,6 +176,13 @@ NAPI_EXTERN napi_status napi_get_value_string_length(napi_env env,
                                                      napi_value value,
                                                      size_t* result);
 
+// Copies LATIN-1 encoded bytes from a string into a buffer.
+NAPI_EXTERN napi_status napi_get_value_string_latin1(napi_env env,
+                                                     napi_value value,
+                                                     char* buf,
+                                                     size_t bufsize,
+                                                     size_t* result);
+
 // Copies UTF-8 encoded bytes from a string into a buffer.
 NAPI_EXTERN napi_status napi_get_value_string_utf8(napi_env env,
                                                    napi_value value,

test/addons-napi/test_string/test.js

@@ -5,22 +5,67 @@ const assert = require('assert');
 // testing api calls for string
 const test_string = require(`./build/${common.buildType}/test_string`);
 
+const empty = '';
+assert.strictEqual(test_string.TestLatin1(empty), empty);
+assert.strictEqual(test_string.TestUtf8(empty), empty);
+assert.strictEqual(test_string.TestUtf16(empty), empty);
+assert.strictEqual(test_string.Length(empty), 0);
+assert.strictEqual(test_string.Utf8Length(empty), 0);
+
 const str1 = 'hello world';
-assert.strictEqual(test_string.Copy(str1), str1);
+assert.strictEqual(test_string.TestLatin1(str1), str1);
+assert.strictEqual(test_string.TestUtf8(str1), str1);
+assert.strictEqual(test_string.TestUtf16(str1), str1);
+assert.strictEqual(test_string.TestLatin1Insufficient(str1), str1.slice(0, 3));
+assert.strictEqual(test_string.TestUtf8Insufficient(str1), str1.slice(0, 3));
+assert.strictEqual(test_string.TestUtf16Insufficient(str1), str1.slice(0, 3));
 assert.strictEqual(test_string.Length(str1), 11);
 assert.strictEqual(test_string.Utf8Length(str1), 11);
 
 const str2 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
-assert.strictEqual(test_string.Copy(str2), str2);
+assert.strictEqual(test_string.TestLatin1(str2), str2);
+assert.strictEqual(test_string.TestUtf8(str2), str2);
+assert.strictEqual(test_string.TestUtf16(str2), str2);
+assert.strictEqual(test_string.TestLatin1Insufficient(str2), str2.slice(0, 3));
+assert.strictEqual(test_string.TestUtf8Insufficient(str2), str2.slice(0, 3));
+assert.strictEqual(test_string.TestUtf16Insufficient(str2), str2.slice(0, 3));
 assert.strictEqual(test_string.Length(str2), 62);
 assert.strictEqual(test_string.Utf8Length(str2), 62);
 
 const str3 = '?!@#$%^&*()_+-=[]{}/.,<>\'"\\';
-assert.strictEqual(test_string.Copy(str3), str3);
+assert.strictEqual(test_string.TestLatin1(str3), str3);
+assert.strictEqual(test_string.TestUtf8(str3), str3);
+assert.strictEqual(test_string.TestUtf16(str3), str3);
+assert.strictEqual(test_string.TestLatin1Insufficient(str3), str3.slice(0, 3));
+assert.strictEqual(test_string.TestUtf8Insufficient(str3), str3.slice(0, 3));
+assert.strictEqual(test_string.TestUtf16Insufficient(str3), str3.slice(0, 3));
 assert.strictEqual(test_string.Length(str3), 27);
 assert.strictEqual(test_string.Utf8Length(str3), 27);
 
-const str4 = '\u{2003}\u{2101}\u{2001}';
-assert.strictEqual(test_string.Copy(str4), str4);
-assert.strictEqual(test_string.Length(str4), 3);
-assert.strictEqual(test_string.Utf8Length(str4), 9);
+const str4 = '¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿';
+assert.strictEqual(test_string.TestLatin1(str4), str4);
+assert.strictEqual(test_string.TestUtf8(str4), str4);
+assert.strictEqual(test_string.TestUtf16(str4), str4);
+assert.strictEqual(test_string.TestLatin1Insufficient(str4), str4.slice(0, 3));
+assert.strictEqual(test_string.TestUtf8Insufficient(str4), str4.slice(0, 1));
+assert.strictEqual(test_string.TestUtf16Insufficient(str4), str4.slice(0, 3));
+assert.strictEqual(test_string.Length(str4), 31);
+assert.strictEqual(test_string.Utf8Length(str4), 62);
+
+const str5 = 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ';
+assert.strictEqual(test_string.TestLatin1(str5), str5);
+assert.strictEqual(test_string.TestUtf8(str5), str5);
+assert.strictEqual(test_string.TestUtf16(str5), str5);
+assert.strictEqual(test_string.TestLatin1Insufficient(str5), str5.slice(0, 3));
+assert.strictEqual(test_string.TestUtf8Insufficient(str5), str5.slice(0, 1));
+assert.strictEqual(test_string.TestUtf16Insufficient(str5), str5.slice(0, 3));
+assert.strictEqual(test_string.Length(str5), 63);
+assert.strictEqual(test_string.Utf8Length(str5), 126);
+
+const str6 = '\u{2003}\u{2101}\u{2001}\u{202}\u{2011}';
+assert.strictEqual(test_string.TestUtf8(str6), str6);
+assert.strictEqual(test_string.TestUtf16(str6), str6);
+assert.strictEqual(test_string.TestUtf8Insufficient(str6), str6.slice(0, 1));
+assert.strictEqual(test_string.TestUtf16Insufficient(str6), str6.slice(0, 3));
+assert.strictEqual(test_string.Length(str6), 5);
+assert.strictEqual(test_string.Utf8Length(str6), 14);

test/addons-napi/test_string/test_string.c

@@ -1,7 +1,33 @@
 #include <node_api.h>
 #include "../common.h"
 
-napi_value Copy(napi_env env, napi_callback_info info) {
+napi_value TestLatin1(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
+
+  NAPI_ASSERT(env, valuetype == napi_string,
+    "Wrong type of argment. Expects a string.");
+
+  char buffer[128];
+  size_t buffer_size = 128;
+  size_t copied;
+
+  NAPI_CALL(env,
+    napi_get_value_string_latin1(env, args[0], buffer, buffer_size, &copied));
+
+  napi_value output;
+  NAPI_CALL(env, napi_create_string_latin1(env, buffer, copied, &output));
+
+  return output;
+}
+
+napi_value TestUtf8(napi_env env, napi_callback_info info) {
   size_t argc = 1;
   napi_value args[1];
   NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
@@ -22,7 +48,111 @@ napi_value Copy(napi_env env, napi_callback_info info) {
     napi_get_value_string_utf8(env, args[0], buffer, buffer_size, &copied));
 
   napi_value output;
-  NAPI_CALL(env, napi_create_string_utf8(env, buffer, copied-1, &output));
+  NAPI_CALL(env, napi_create_string_utf8(env, buffer, copied, &output));
+
+  return output;
+}
+
+napi_value TestUtf16(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
+
+  NAPI_ASSERT(env, valuetype == napi_string,
+    "Wrong type of argment. Expects a string.");
+
+  char16_t buffer[128];
+  size_t buffer_size = 128;
+  size_t copied;
+
+  NAPI_CALL(env,
+    napi_get_value_string_utf16(env, args[0], buffer, buffer_size, &copied));
+
+  napi_value output;
+  NAPI_CALL(env, napi_create_string_utf16(env, buffer, copied, &output));
+
+  return output;
+}
+
+napi_value TestLatin1Insufficient(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
+
+  NAPI_ASSERT(env, valuetype == napi_string,
+    "Wrong type of argment. Expects a string.");
+
+  char buffer[4];
+  size_t buffer_size = 4;
+  size_t copied;
+
+  NAPI_CALL(env,
+    napi_get_value_string_latin1(env, args[0], buffer, buffer_size, &copied));
+
+  napi_value output;
+  NAPI_CALL(env, napi_create_string_latin1(env, buffer, copied, &output));
+
+  return output;
+}
+
+napi_value TestUtf8Insufficient(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
+
+  NAPI_ASSERT(env, valuetype == napi_string,
+    "Wrong type of argment. Expects a string.");
+
+  char buffer[4];
+  size_t buffer_size = 4;
+  size_t copied;
+
+  NAPI_CALL(env,
+    napi_get_value_string_utf8(env, args[0], buffer, buffer_size, &copied));
+
+  napi_value output;
+  NAPI_CALL(env, napi_create_string_utf8(env, buffer, copied, &output));
+
+  return output;
+}
+
+napi_value TestUtf16Insufficient(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
+
+  NAPI_ASSERT(env, valuetype == napi_string,
+    "Wrong type of argment. Expects a string.");
+
+  char16_t buffer[4];
+  size_t buffer_size = 4;
+  size_t copied;
+
+  NAPI_CALL(env,
+    napi_get_value_string_utf16(env, args[0], buffer, buffer_size, &copied));
+
+  napi_value output;
+  NAPI_CALL(env, napi_create_string_utf16(env, buffer, copied, &output));
 
   return output;
 }
@@ -73,7 +203,12 @@ napi_value Utf8Length(napi_env env, napi_callback_info info) {
 
 void Init(napi_env env, napi_value exports, napi_value module, void* priv) {
   napi_property_descriptor properties[] = {
-    DECLARE_NAPI_PROPERTY("Copy", Copy),
+    DECLARE_NAPI_PROPERTY("TestLatin1", TestLatin1),
+    DECLARE_NAPI_PROPERTY("TestLatin1Insufficient", TestLatin1Insufficient),
+    DECLARE_NAPI_PROPERTY("TestUtf8", TestUtf8),
+    DECLARE_NAPI_PROPERTY("TestUtf8Insufficient", TestUtf8Insufficient),
+    DECLARE_NAPI_PROPERTY("TestUtf16", TestUtf16),
+    DECLARE_NAPI_PROPERTY("TestUtf16Insufficient", TestUtf16Insufficient),
     DECLARE_NAPI_PROPERTY("Length", Length),
     DECLARE_NAPI_PROPERTY("Utf8Length", Utf8Length),
   };