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Make the underlying buffer of the ArrayBuffer accessible. (#2836)

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JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com
This commit is contained in:
László Langó
2019-04-24 16:03:56 +02:00
committed by GitHub
parent c4ac67d4af
commit a6a7d8c7b8
3 changed files with 17 additions and 31 deletions
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jerry-core/api/jerry.c
+9 -14
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@@ -3198,34 +3198,29 @@ jerry_get_arraybuffer_byte_length (const jerry_value_t value) /**< ArrayBuffer *
* Get a pointer for the start of the ArrayBuffer.
*
* Note:
* * Only valid for ArrayBuffers created with jerry_create_arraybuffer_external.
* * This is a high-risk operation as the bounds are not checked
* when accessing the pointer elements.
* * jerry_release_value must be called on the ArrayBuffer when the pointer is no longer needed.
*
* @return pointer to the back-buffer of the ArrayBuffer.
* pointer is NULL if the parameter is not an ArrayBuffer with external memory
or it is not an ArrayBuffer at all.
* pointer is NULL if the parameter is not an ArrayBuffer
*/
uint8_t *
jerry_get_arraybuffer_pointer (const jerry_value_t value) /**< Array Buffer to use */
jerry_get_arraybuffer_pointer (const jerry_value_t array_buffer) /**< Array Buffer to use */
{
jerry_assert_api_available ();
#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
if (!ecma_is_arraybuffer (value))
if (ecma_is_value_error_reference (array_buffer)
|| !ecma_is_arraybuffer (array_buffer))
{
return NULL;
}
ecma_object_t *buffer_p = ecma_get_object_from_value (value);
if (ECMA_ARRAYBUFFER_HAS_EXTERNAL_MEMORY (buffer_p))
{
jerry_acquire_value (value);
lit_utf8_byte_t *mem_buffer_p = ecma_arraybuffer_get_buffer (buffer_p);
return (uint8_t *const) mem_buffer_p;
}
ecma_object_t *buffer_p = ecma_get_object_from_value (array_buffer);
lit_utf8_byte_t *mem_buffer_p = ecma_arraybuffer_get_buffer (buffer_p);
return (uint8_t *const) mem_buffer_p;
#else /* !ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
JERRY_UNUSED (value);
JERRY_UNUSED (array_buffer);
#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
return NULL;