[njs] Introduced Buffer implementation.
Alexander Borisov
alexander.borisov at nginx.com
Wed Sep 16 14:23:05 UTC 2020
details: https://hg.nginx.org/njs/rev/27bb9caf186c
branches:
changeset: 1523:27bb9caf186c
user: Alexander Borisov <alexander.borisov at nginx.com>
date: Wed Sep 16 17:22:01 2020 +0300
description:
Introduced Buffer implementation.
diffstat:
auto/sources | 1 +
src/njs.h | 6 +-
src/njs_array_buffer.c | 16 +-
src/njs_array_buffer.h | 5 +-
src/njs_buffer.c | 2944 +++++++++++++++++++++++++++++++++++++++++
src/njs_buffer.h | 19 +
src/njs_builtin.c | 14 +
src/njs_encoding.c | 4 +-
src/njs_main.h | 1 +
src/njs_object_hash.h | 10 +
src/njs_string.c | 42 +
src/njs_string.h | 4 +
src/njs_typed_array.c | 67 +-
src/njs_typed_array.h | 7 +-
src/njs_utils.h | 12 +
src/njs_value.c | 1 +
src/njs_value.h | 1 +
src/njs_vm.c | 6 +-
src/njs_vm.h | 1 +
src/test/njs_externals_test.c | 9 +-
src/test/njs_unit_test.c | 936 ++++++++++++-
21 files changed, 4011 insertions(+), 95 deletions(-)
diffs (truncated from 4450 to 1000 lines):
diff -r e1dccc5a2f05 -r 27bb9caf186c auto/sources
--- a/auto/sources Fri Sep 11 13:54:57 2020 +0000
+++ b/auto/sources Wed Sep 16 17:22:01 2020 +0300
@@ -57,6 +57,7 @@ NJS_LIB_SRCS=" \
src/njs_promise.c \
src/njs_query_string.c \
src/njs_encoding.c \
+ src/njs_buffer.c \
"
NJS_LIB_TEST_SRCS=" \
diff -r e1dccc5a2f05 -r 27bb9caf186c src/njs.h
--- a/src/njs.h Fri Sep 11 13:54:57 2020 +0000
+++ b/src/njs.h Wed Sep 16 17:22:01 2020 +0300
@@ -317,11 +317,11 @@ NJS_EXPORT njs_int_t njs_vm_value_string
njs_value_t *value, uintptr_t *next);
/*
- * Sets a Uint8Array value.
+ * Sets a Buffer value.
* start data is not copied and should not be freed.
*/
-NJS_EXPORT njs_int_t njs_vm_value_typed_array_uint8_set(njs_vm_t *vm,
- njs_value_t *value, const u_char *start, uint32_t size);
+NJS_EXPORT njs_int_t njs_vm_value_buffer_set(njs_vm_t *vm, njs_value_t *value,
+ const u_char *start, uint32_t size);
/*
* Converts a value to string.
diff -r e1dccc5a2f05 -r 27bb9caf186c src/njs_array_buffer.c
--- a/src/njs_array_buffer.c Fri Sep 11 13:54:57 2020 +0000
+++ b/src/njs_array_buffer.c Wed Sep 16 17:22:01 2020 +0300
@@ -8,7 +8,7 @@
njs_array_buffer_t *
-njs_array_buffer_alloc(njs_vm_t *vm, uint64_t size)
+njs_array_buffer_alloc(njs_vm_t *vm, uint64_t size, njs_bool_t zeroing)
{
njs_object_t *proto;
njs_array_buffer_t *array;
@@ -22,11 +22,15 @@ njs_array_buffer_alloc(njs_vm_t *vm, uin
goto memory_error;
}
- if (size > 0) {
+ if (zeroing) {
array->u.data = njs_mp_zalloc(vm->mem_pool, size);
- if (njs_slow_path(array->u.data == NULL)) {
- goto memory_error;
- }
+
+ } else {
+ array->u.data = njs_mp_alloc(vm->mem_pool, size);
+ }
+
+ if (njs_slow_path(array->u.data == NULL)) {
+ goto memory_error;
}
proto = &vm->prototypes[NJS_OBJ_TYPE_ARRAY_BUFFER].object;
@@ -80,7 +84,7 @@ njs_array_buffer_constructor(njs_vm_t *v
return NJS_ERROR;
}
- array = njs_array_buffer_alloc(vm, size);
+ array = njs_array_buffer_alloc(vm, size, 1);
if (njs_slow_path(array == NULL)) {
return NJS_ERROR;
}
diff -r e1dccc5a2f05 -r 27bb9caf186c src/njs_array_buffer.h
--- a/src/njs_array_buffer.h Fri Sep 11 13:54:57 2020 +0000
+++ b/src/njs_array_buffer.h Wed Sep 16 17:22:01 2020 +0300
@@ -12,7 +12,8 @@
((buffer)->size)
-njs_array_buffer_t *njs_array_buffer_alloc(njs_vm_t *vm, uint64_t size);
+njs_array_buffer_t *njs_array_buffer_alloc(njs_vm_t *vm, uint64_t size,
+ njs_bool_t zeroing);
njs_int_t njs_array_buffer_writable(njs_vm_t *vm, njs_array_buffer_t *buffer);
njs_inline njs_array_buffer_t *
@@ -29,7 +30,7 @@ njs_array_buffer_slice(njs_vm_t *vm, njs
new_len = njs_max(final - first, 0);
- new_buffer = njs_array_buffer_alloc(vm, new_len);
+ new_buffer = njs_array_buffer_alloc(vm, new_len, 1);
if (new_buffer == NULL) {
return NULL;
}
diff -r e1dccc5a2f05 -r 27bb9caf186c src/njs_buffer.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/njs_buffer.c Wed Sep 16 17:22:01 2020 +0300
@@ -0,0 +1,2944 @@
+
+/*
+ * Copyright (C) Alexander Borisov
+ * Copyright (C) Dmitry Volyntsev
+ * Copyright (C) NGINX, Inc.
+ */
+
+
+#include <njs_main.h>
+
+
+#define INT24_MAX 0x7FFFFF
+#define INT40_MAX 0x7FFFFFFFFFULL
+#define INT48_MAX 0x7FFFFFFFFFFFULL
+
+#define njs_buffer_magic(size, sign, little) \
+ ((size << 2) | (sign << 1) | little)
+
+
+typedef njs_int_t (*njs_buffer_encode)(njs_vm_t *vm, njs_value_t *value,
+ const njs_str_t *src);
+typedef size_t (*njs_buffer_encode_length)(const njs_str_t *src,
+ size_t *out_size);
+
+typedef struct {
+ njs_str_t name;
+ njs_buffer_encode encode;
+ njs_buffer_encode decode;
+ njs_buffer_encode_length decode_length;
+} njs_buffer_encoding_t;
+
+
+static njs_buffer_encoding_t njs_buffer_encodings[] =
+{
+ {
+ njs_str("utf-8"),
+ njs_string_decode_utf8,
+ njs_string_decode_utf8,
+ njs_decode_utf8_length
+ },
+
+ {
+ njs_str("utf8"),
+ njs_string_decode_utf8,
+ njs_string_decode_utf8,
+ njs_decode_utf8_length
+ },
+
+ {
+ njs_str("hex"),
+ njs_string_hex,
+ njs_string_decode_hex,
+ njs_decode_hex_length
+ },
+
+ {
+ njs_str("base64"),
+ njs_string_base64,
+ njs_string_decode_base64,
+ njs_decode_base64_length
+ },
+
+ {
+ njs_str("base64url"),
+ njs_string_base64url,
+ njs_string_decode_base64url,
+ njs_decode_base64url_length
+ },
+
+ { njs_null_str, 0, 0, 0 }
+
+#define njs_buffer_utf8_encoding() &njs_buffer_encodings[0]
+};
+
+
+static njs_int_t njs_buffer_from_object(njs_vm_t *vm, njs_value_t *value);
+static njs_int_t njs_buffer_from_array_buffer(njs_vm_t *vm, njs_value_t *value,
+ njs_value_t *length, njs_value_t *offset);
+static njs_int_t njs_buffer_from_typed_array(njs_vm_t *vm, njs_value_t *value);
+static njs_int_t njs_buffer_from_string(njs_vm_t *vm, njs_value_t *value,
+ const njs_buffer_encoding_t *encoding);
+static njs_int_t njs_buffer_write_string(njs_vm_t *vm, njs_value_t *value,
+ njs_typed_array_t *array, const njs_buffer_encoding_t *encoding,
+ uint64_t offset, uint64_t length);
+static njs_int_t njs_buffer_fill(njs_vm_t *vm, njs_typed_array_t *array,
+ njs_value_t *value, const njs_buffer_encoding_t *encoding, uint64_t offset,
+ uint64_t end);
+static njs_int_t njs_buffer_fill_string(njs_vm_t *vm, njs_value_t *value,
+ njs_typed_array_t *array, const njs_buffer_encoding_t *encoding,
+ uint8_t *start, uint8_t *end);
+static njs_int_t njs_buffer_fill_typed_array(njs_vm_t *vm, njs_value_t *value,
+ njs_typed_array_t *array, uint8_t *start, uint8_t *end);
+static const njs_buffer_encoding_t *njs_buffer_encoding(njs_vm_t *vm,
+ njs_value_t *value);
+static njs_int_t njs_buffer_decode_string(njs_vm_t *vm, njs_value_t *value,
+ njs_value_t *dst, const njs_buffer_encoding_t *encoding);
+static void njs_buffer_decode_destroy(njs_vm_t *vm, njs_value_t *source,
+ njs_value_t *target);
+
+
+njs_int_t
+njs_buffer_set(njs_vm_t *vm, njs_value_t *value, const u_char *start,
+ uint32_t size)
+{
+ njs_object_t *proto;
+ njs_typed_array_t *array;
+ njs_array_buffer_t *buffer;
+
+ array = njs_mp_alloc(vm->mem_pool, sizeof(njs_typed_array_t)
+ + sizeof(njs_array_buffer_t));
+ if (njs_slow_path(array == NULL)) {
+ njs_memory_error(vm);
+ return NJS_ERROR;
+ }
+
+ buffer = (njs_array_buffer_t *) &array[1];
+
+ proto = &vm->prototypes[NJS_OBJ_TYPE_BUFFER].object;
+
+ njs_lvlhsh_init(&buffer->object.hash);
+ njs_lvlhsh_init(&buffer->object.shared_hash);
+ buffer->object.__proto__ = proto;
+ buffer->object.slots = NULL;
+ buffer->object.type = NJS_ARRAY_BUFFER;
+ buffer->object.shared = 1;
+ buffer->object.extensible = 1;
+ buffer->object.error_data = 0;
+ buffer->object.fast_array = 0;
+ buffer->u.data = (void *) start;
+ buffer->size = size;
+
+ array->type = NJS_OBJ_TYPE_UINT8_ARRAY;
+ njs_lvlhsh_init(&array->object.hash);
+ njs_lvlhsh_init(&array->object.shared_hash);
+ array->object.__proto__ = &vm->prototypes[array->type].object;
+ array->object.slots = NULL;
+ array->object.type = NJS_TYPED_ARRAY;
+ array->object.shared = 0;
+ array->object.extensible = 1;
+ array->object.error_data = 0;
+ array->object.fast_array = 1;
+ array->buffer = buffer;
+ array->offset = 0;
+ array->byte_length = size;
+
+ njs_set_typed_array(value, array);
+
+ return NJS_OK;
+}
+
+
+static njs_typed_array_t *
+njs_buffer_alloc_array(njs_vm_t *vm, size_t size, njs_bool_t zeroing)
+{
+ njs_value_t value;
+ njs_typed_array_t *array;
+
+ njs_set_number(&value, size);
+
+ array = njs_typed_array_alloc(vm, &value, 1, zeroing,
+ NJS_OBJ_TYPE_UINT8_ARRAY);
+ if (njs_slow_path(array == NULL)) {
+ return NULL;
+ }
+
+ array->object.__proto__ = &vm->prototypes[NJS_OBJ_TYPE_BUFFER].object;
+
+ return array;
+}
+
+
+static njs_int_t
+njs_buffer_constructor(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ njs_type_error(vm, "Buffer is not a constructor");
+
+ return NJS_ERROR;
+}
+
+
+static njs_int_t
+njs_buffer_alloc(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t safe)
+{
+ double size;
+ njs_int_t ret;
+ njs_typed_array_t *array;
+ const njs_buffer_encoding_t *encoding;
+
+ if (njs_slow_path(!njs_is_number(njs_arg(args, nargs, 1)))) {
+ njs_type_error(vm, "\"size\" argument must be of type number");
+ return NJS_ERROR;
+ }
+
+ size = njs_number(njs_argument(args, 1));
+ if (njs_slow_path(size < 0 || size > INT32_MAX)) {
+ njs_range_error(vm, "invalid size");
+ return NJS_ERROR;
+ }
+
+ array = njs_buffer_alloc_array(vm, size, safe || nargs <= 2);
+ if (njs_slow_path(array == NULL)) {
+ return NJS_ERROR;
+ }
+
+ if (safe && nargs > 2) {
+ encoding = njs_buffer_utf8_encoding();
+
+ if (nargs > 3 && njs_is_string(njs_argument(args, 2))) {
+ encoding = njs_buffer_encoding(vm, njs_argument(args, 3));
+ if (njs_slow_path(encoding == NULL)) {
+ return NJS_ERROR;
+ }
+ }
+
+ ret = njs_buffer_fill(vm, array, njs_argument(args, 2), encoding, 0,
+ array->byte_length);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_ERROR;
+ }
+ }
+
+ njs_set_typed_array(&vm->retval, array);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_from(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ njs_int_t ret;
+ njs_value_t *value;
+ const njs_buffer_encoding_t *encoding;
+
+ value = njs_arg(args, nargs, 1);
+
+ switch (value->type) {
+ case NJS_TYPED_ARRAY:
+ return njs_buffer_from_typed_array(vm, value);
+
+ case NJS_ARRAY_BUFFER:
+ return njs_buffer_from_array_buffer(vm, value, njs_arg(args, nargs, 2),
+ njs_arg(args, nargs, 3));
+
+ case NJS_STRING:
+ encoding = njs_buffer_utf8_encoding();
+
+ if (nargs > 2) {
+ encoding = njs_buffer_encoding(vm, njs_argument(args, 2));
+ if (njs_slow_path(encoding == NULL)) {
+ return NJS_ERROR;
+ }
+ }
+
+ return njs_buffer_from_string(vm, value, encoding);
+
+ default:
+ if (njs_is_object(value)) {
+ ret = njs_buffer_from_object(vm, value);
+ if (njs_slow_path(ret != NJS_DECLINED)) {
+ return ret;
+ }
+ }
+
+ njs_type_error(vm, "first argument %s is not a string "
+ "or Buffer-like object", njs_type_string(value->type));
+ }
+
+ return NJS_ERROR;
+}
+
+
+static njs_int_t
+njs_buffer_from_object(njs_vm_t *vm, njs_value_t *value)
+{
+ double num;
+ int64_t len;
+ uint8_t *p;
+ uint32_t i;
+ njs_str_t str;
+ njs_int_t ret;
+ njs_array_t *array;
+ njs_value_t retval, length;
+ njs_typed_array_t *buffer;
+
+ static const njs_value_t string_length = njs_string("length");
+ static const njs_str_t str_buffer = njs_str("Buffer");
+
+next:
+
+ ret = njs_value_property(vm, value, njs_value_arg(&string_length),
+ &length);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return ret;
+ }
+
+ if (ret == NJS_DECLINED) {
+ ret = njs_value_property(vm, value, njs_value_arg(&njs_string_type),
+ &retval);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_DECLINED;
+ }
+
+ ret = njs_value_to_string(vm, &retval, &retval);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_DECLINED;
+ }
+
+ njs_string_get(&retval, &str);
+
+ if (!njs_strstr_eq(&str, &str_buffer)) {
+ return NJS_DECLINED;
+ }
+
+ ret = njs_value_property(vm, value, njs_value_arg(&njs_string_data),
+ &retval);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_DECLINED;
+ }
+
+ if (njs_is_object(&retval)) {
+ value = &retval;
+ goto next;
+ }
+
+ return NJS_DECLINED;
+ }
+
+ ret = njs_value_to_length(vm, &length, &len);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ buffer = njs_buffer_alloc_array(vm, len, 0);
+ if (njs_slow_path(buffer == NULL)) {
+ return NJS_ERROR;
+ }
+
+ p = njs_typed_array_buffer(buffer)->u.u8;
+
+ if (njs_is_fast_array(value)) {
+ array = njs_array(value);
+
+ for (i = 0; i < array->length; i++) {
+ ret = njs_value_to_number(vm, &array->start[i], &num);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ *p++ = njs_number_to_int32(num);
+ }
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+ }
+
+ for (i = 0; i < len; i++) {
+ ret = njs_value_property_i64(vm, value, i, &retval);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return ret;
+ }
+
+ ret = njs_value_to_number(vm, &retval, &num);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ *p++ = njs_number_to_int32(num);
+ }
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_from_array_buffer(njs_vm_t *vm, njs_value_t *value,
+ njs_value_t *offset, njs_value_t *length)
+{
+ int64_t off, len;
+ njs_int_t ret;
+ njs_value_t arg;
+ njs_typed_array_t *buffer;
+ njs_array_buffer_t *array;
+
+ array = njs_array_buffer(value);
+
+ ret = njs_value_to_index(vm, offset, (uint64_t *) &off);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ if ((size_t) off > array->size) {
+ njs_range_error(vm, "\"offset\" is outside of buffer bounds");
+ return NJS_ERROR;
+ }
+
+ if (njs_is_defined(length)) {
+ ret = njs_value_to_length(vm, length, &len);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ } else {
+ len = array->size - off;
+ }
+
+ if ((size_t) (off + len) > array->size) {
+ njs_range_error(vm, "\"length\" is outside of buffer bounds");
+ return NJS_ERROR;
+ }
+
+ njs_set_array_buffer(&arg, array);
+
+ buffer = njs_typed_array_alloc(vm, &arg, 1, 0, NJS_OBJ_TYPE_UINT8_ARRAY);
+ if (njs_slow_path(buffer == NULL)) {
+ return NJS_ERROR;
+ }
+
+ buffer->object.__proto__ = &vm->prototypes[NJS_OBJ_TYPE_BUFFER].object;
+
+ buffer->offset = off;
+ buffer->byte_length = len;
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_from_typed_array(njs_vm_t *vm, njs_value_t *value)
+{
+ uint8_t *p;
+ uint32_t i, length;
+ njs_typed_array_t *buffer, *array;
+
+ array = njs_typed_array(value);
+ length = njs_typed_array_length(array);
+
+ buffer = njs_buffer_alloc_array(vm, length, 0);
+ if (njs_slow_path(buffer == NULL)) {
+ return NJS_ERROR;
+ }
+
+ p = njs_typed_array_buffer(buffer)->u.u8;
+
+ for (i = 0; i < length; i++) {
+ *p++ = njs_number_to_int32(njs_typed_array_prop(array, i));
+ }
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_from_string(njs_vm_t *vm, njs_value_t *value,
+ const njs_buffer_encoding_t *encoding)
+{
+ njs_int_t ret;
+ njs_str_t str;
+ njs_value_t dst;
+ njs_typed_array_t *buffer;
+
+ ret = njs_buffer_decode_string(vm, value, &dst, encoding);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_ERROR;
+ }
+
+ njs_string_get(&dst, &str);
+
+ buffer = njs_buffer_alloc_array(vm, str.length, 0);
+ if (njs_slow_path(buffer == NULL)) {
+ return NJS_ERROR;
+ }
+
+ memcpy(njs_typed_array_buffer(buffer)->u.u8, str.start, str.length);
+
+ njs_buffer_decode_destroy(vm, value, &dst);
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+}
+
+
+static size_t
+njs_buffer_decode_string_length(njs_value_t *value,
+ const njs_buffer_encoding_t *encoding)
+{
+ size_t size;
+ njs_str_t str;
+ njs_string_prop_t string;
+
+ (void) njs_string_prop(&string, value);
+
+ str.start = string.start;
+ str.length = string.size;
+ size = string.size;
+
+ if (encoding->decode == njs_string_decode_utf8 && string.length != 0) {
+ return size;
+ }
+
+ encoding->decode_length(&str, &size);
+
+ return size;
+}
+
+
+static njs_int_t
+njs_buffer_byte_length(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ size_t size;
+ njs_value_t *value, *enc;
+ const njs_buffer_encoding_t *encoding;
+
+ value = njs_arg(args, nargs, 1);
+
+ switch (value->type) {
+ case NJS_TYPED_ARRAY:
+ njs_set_number(&vm->retval, njs_typed_array(value)->byte_length);
+ return NJS_OK;
+
+ case NJS_ARRAY_BUFFER:
+ njs_set_number(&vm->retval, njs_array_buffer(value)->size);
+ return NJS_OK;
+
+ case NJS_DATA_VIEW:
+ njs_set_number(&vm->retval, njs_data_view(value)->byte_length);
+ return NJS_OK;
+
+ case NJS_STRING:
+ enc = njs_arg(args, nargs, 2);
+ encoding = njs_buffer_utf8_encoding();
+
+ if (njs_is_defined(enc)) {
+ encoding = njs_buffer_encoding(vm, enc);
+ if (njs_slow_path(encoding == NULL)) {
+ return NJS_ERROR;
+ }
+ }
+
+ size = njs_buffer_decode_string_length(value, encoding);
+
+ njs_set_number(&vm->retval, size);
+
+ return NJS_OK;
+
+ default:
+ njs_type_error(vm, "first argument %s is not a string "
+ "or Buffer-like object", njs_type_string(value->type));
+ }
+
+ return NJS_ERROR;
+}
+
+
+static njs_typed_array_t *
+njs_buffer_slot(njs_vm_t *vm, njs_value_t *value, const char *name)
+{
+ njs_typed_array_t *array;
+
+ if (njs_slow_path(!njs_is_object(value))) {
+ goto failed;
+ }
+
+ array = njs_object_proto_lookup(njs_object(value), NJS_TYPED_ARRAY,
+ njs_typed_array_t);
+
+ if (njs_slow_path(array != NULL
+ && array->type != NJS_OBJ_TYPE_UINT8_ARRAY))
+ {
+ goto failed;
+ }
+
+ return array;
+
+failed:
+
+ njs_type_error(vm, "\"%s\" argument must be an instance "
+ "of Buffer or Uint8Array", name);
+ return NULL;
+}
+
+
+static njs_int_t
+njs_buffer_array_range(njs_vm_t *vm, njs_typed_array_t *array,
+ const njs_value_t *start, const njs_value_t *end, const char *name,
+ uint8_t **out_start, uint8_t **out_end)
+{
+ uint8_t *u8;
+ uint64_t num_start, num_end;
+ njs_int_t ret;
+
+ num_start = 0;
+
+ if (njs_is_defined(start)) {
+ ret = njs_value_to_index(vm, njs_value_arg(start), &num_start);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+ }
+
+ if (num_start > array->byte_length) {
+ njs_range_error(vm, "\"%sStart\" is out of range: %L", name, num_start);
+ return NJS_ERROR;
+ }
+
+ num_end = array->byte_length;
+
+ if (njs_is_defined(end)) {
+ ret = njs_value_to_index(vm, njs_value_arg(end), &num_end);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+ }
+
+ if (num_end > array->byte_length) {
+ njs_range_error(vm, "\"%sEnd\" is out of range: %L", name, num_end);
+ return NJS_ERROR;
+ }
+
+ if (num_start > num_end) {
+ num_end = num_start;
+ }
+
+ u8 = njs_typed_array_buffer(array)->u.u8;
+ *out_start = &u8[array->offset + num_start];
+ *out_end = &u8[array->offset + num_end];
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_compare_array(njs_vm_t *vm, njs_value_t *val1, njs_value_t *val2,
+ const njs_value_t *target_start, const njs_value_t *target_end,
+ const njs_value_t *source_start, const njs_value_t *source_end)
+{
+ size_t size, src_size, trg_size;
+ uint8_t *src, *src_end, *trg, *trg_end;
+ njs_int_t ret;
+ njs_typed_array_t *source, *target;
+
+ source = njs_buffer_slot(vm , val1, "source");
+ if (njs_slow_path(source == NULL)) {
+ return NJS_ERROR;
+ }
+
+ target = njs_buffer_slot(vm , val2, "target");
+ if (njs_slow_path(target == NULL)) {
+ return NJS_ERROR;
+ }
+
+ ret = njs_buffer_array_range(vm, target, target_start, target_end, "target",
+ &trg, &trg_end);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ ret = njs_buffer_array_range(vm, source, source_start, source_end, "source",
+ &src, &src_end);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return ret;
+ }
+
+ trg_size = trg_end - trg;
+ src_size = src_end - src;
+
+ size = njs_min(trg_size, src_size);
+
+ ret = memcmp(trg, src, size);
+
+ if (ret != 0) {
+ njs_set_number(&vm->retval, (ret < 0) ? 1 : -1);
+ return NJS_OK;
+ }
+
+ if (trg_size > src_size) {
+ ret = -1;
+
+ } else if (trg_size < src_size) {
+ ret = 1;
+ }
+
+ njs_set_number(&vm->retval, ret);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_compare(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ return njs_buffer_compare_array(vm, njs_arg(args, nargs, 1),
+ njs_arg(args, nargs, 2),
+ &njs_value_undefined, &njs_value_undefined,
+ &njs_value_undefined, &njs_value_undefined);
+}
+
+
+static njs_int_t
+njs_buffer_concat(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ u_char *p;
+ size_t n;
+ int64_t i, len, list_len;
+ njs_int_t ret;
+ njs_value_t *list, *value, *length, retval;
+ njs_array_t *array;
+ njs_typed_array_t *buffer, *arr;
+
+ list = njs_arg(args, nargs, 1);
+
+ if (njs_slow_path(!njs_is_array(list))) {
+ njs_type_error(vm, "\"list\" argument must be an instance of Array");
+ return NJS_ERROR;
+ }
+
+ len = 0;
+ ret = njs_object_length(vm, list, &list_len);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return ret;
+ }
+
+ if (njs_is_fast_array(list)) {
+ array = njs_array(list);
+ for (i = 0; i < list_len; i++) {
+ value = &array->start[i];
+
+ if (njs_slow_path(!njs_is_typed_array_uint8(value))) {
+ njs_type_error(vm, "\"list[%L]\" argument must be an "
+ "instance of Buffer or Uint8Array", i);
+ return NJS_ERROR;
+ }
+
+ arr = njs_typed_array(value);
+
+ if (njs_slow_path((SIZE_MAX - len) < arr->byte_length)) {
+ njs_type_error(vm, "Invalid length");
+ return NJS_ERROR;
+ }
+
+ len += arr->byte_length;
+ }
+
+ } else {
+
+ for (i = 0; i < list_len; i++) {
+ ret = njs_value_property_i64(vm, list, i, &retval);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return ret;
+ }
+
+ if (njs_slow_path(!njs_is_typed_array(&retval))) {
+ njs_type_error(vm, "\"list[%L]\" argument must be an "
+ "instance of Buffer or Uint8Array", i);
+ return NJS_ERROR;
+ }
+
+ arr = njs_typed_array(&retval);
+
+ if (njs_slow_path((SIZE_MAX - len) < arr->byte_length)) {
+ njs_type_error(vm, "Invalid length");
+ return NJS_ERROR;
+ }
+
+ len += arr->byte_length;
+ }
+ }
+
+ length = njs_arg(args, nargs, 2);
+ if (njs_is_defined(length)) {
+ if (njs_slow_path(!njs_is_number(length))) {
+ njs_type_error(vm, "\"length\" argument must be of type number");
+ return NJS_ERROR;
+ }
+
+ len = njs_number(length);
+ if (njs_slow_path(len < 0)) {
+ njs_range_error(vm, "\"length\" is out of range");
+ return NJS_ERROR;
+ }
+ }
+
+ buffer = njs_buffer_alloc_array(vm, len, 0);
+ if (njs_slow_path(buffer == NULL)) {
+ return NJS_ERROR;
+ }
+
+ p = njs_typed_array_buffer(buffer)->u.u8;
+
+ if (njs_is_fast_array(list)) {
+ array = njs_array(list);
+
+ for (i = 0; len != 0 && i < list_len; i++) {
+ arr = njs_typed_array(&array->start[i]);
+ n = njs_min((size_t) len, arr->byte_length);
+
+ p = njs_cpymem(p, njs_typed_array_buffer(arr)->u.u8, n);
+
+ len -= n;
+ }
+
+ } else {
+ for (i = 0; len != 0 && i < list_len; i++) {
+ ret = njs_value_property_i64(vm, list, i, &retval);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return ret;
+ }
+
+ arr = njs_typed_array(&retval);
+ n = njs_min((size_t) len, arr->byte_length);
+
+ p = njs_cpymem(p, njs_typed_array_buffer(arr)->u.u8, n);
+
+ len -= n;
+ }
+ }
+
+ if (len != 0) {
+ njs_memzero(p, len);
+ }
+
+ njs_set_typed_array(&vm->retval, buffer);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_is_buffer(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ njs_bool_t is;
+ njs_typed_array_t *array;
+
+ is = 0;
+
+ array = njs_buffer_slot(vm , njs_arg(args, nargs, 1), "source");
+
+ if (njs_fast_path(array != NULL && array->object.__proto__
+ == &vm->prototypes[NJS_OBJ_TYPE_BUFFER].object))
+ {
+ is = 1;
+ }
+
+ njs_set_boolean(&vm->retval, is);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_is_encoding(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ njs_set_boolean(&vm->retval,
+ njs_buffer_encoding(vm, njs_arg(args, nargs, 1)) != NULL);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_prototype_length(njs_vm_t *vm, njs_object_prop_t *prop,
+ njs_value_t *value, njs_value_t *setval, njs_value_t *retval)
+{
+ njs_typed_array_t *array;
+
+ array = njs_buffer_slot(vm, value, "this");
+ if (njs_slow_path(array == NULL)) {
+ njs_set_undefined(retval);
+ return NJS_DECLINED;
+ }
+
+ njs_set_number(retval, array->byte_length);
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+njs_buffer_prototype_read_int(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t magic)
+{
+ double v;
+ uint32_t u32;
+ uint64_t u64, index, size;
+ njs_int_t ret;
+ njs_bool_t little, swap, sign;
+ njs_value_t *this, *value;
+ const uint8_t *u8;
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