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node_modules
bufferutil
src
File Content:
bufferutil.c
#define NAPI_VERSION 1 #include <assert.h> #include <node_api.h> napi_value Mask(napi_env env, napi_callback_info info) { napi_status status; size_t argc = 5; napi_value argv[5]; status = napi_get_cb_info(env, info, &argc, argv, NULL, NULL); assert(status == napi_ok); uint8_t *source; uint8_t *mask; uint8_t *destination; uint32_t offset; uint32_t length; status = napi_get_buffer_info(env, argv[0], (void **)&source, NULL); assert(status == napi_ok); status = napi_get_buffer_info(env, argv[1], (void **)&mask, NULL); assert(status == napi_ok); status = napi_get_buffer_info(env, argv[2], (void **)&destination, NULL); assert(status == napi_ok); status = napi_get_value_uint32(env, argv[3], &offset); assert(status == napi_ok); status = napi_get_value_uint32(env, argv[4], &length); assert(status == napi_ok); destination += offset; uint32_t index = 0; // // Alignment preamble. // while (index < length && ((size_t)source % 8)) { *destination++ = *source++ ^ mask[index % 4]; index++; } length -= index; if (!length) return NULL; // // Realign mask and convert to 64 bit. // uint8_t maskAlignedArray[8]; for (uint8_t i = 0; i < 8; i++, index++) { maskAlignedArray[i] = mask[index % 4]; } // // Apply 64 bit mask in 8 byte chunks. // uint32_t loop = length / 8; uint64_t *pMask8 = (uint64_t *)maskAlignedArray; while (loop--) { uint64_t *pFrom8 = (uint64_t *)source; uint64_t *pTo8 = (uint64_t *)destination; *pTo8 = *pFrom8 ^ *pMask8; source += 8; destination += 8; } // // Apply mask to remaining data. // uint8_t *pmaskAlignedArray = maskAlignedArray; length %= 8; while (length--) { *destination++ = *source++ ^ *pmaskAlignedArray++; } return NULL; } napi_value Unmask(napi_env env, napi_callback_info info) { napi_status status; size_t argc = 2; napi_value argv[2]; status = napi_get_cb_info(env, info, &argc, argv, NULL, NULL); assert(status == napi_ok); uint8_t *source; size_t length; uint8_t *mask; status = napi_get_buffer_info(env, argv[0], (void **)&source, &length); assert(status == napi_ok); status = napi_get_buffer_info(env, argv[1], (void **)&mask, NULL); assert(status == napi_ok); uint32_t index = 0; // // Alignment preamble. // while (index < length && ((size_t)source % 8)) { *source++ ^= mask[index % 4]; index++; } length -= index; if (!length) return NULL; // // Realign mask and convert to 64 bit. // uint8_t maskAlignedArray[8]; for (uint8_t i = 0; i < 8; i++, index++) { maskAlignedArray[i] = mask[index % 4]; } // // Apply 64 bit mask in 8 byte chunks. // uint32_t loop = length / 8; uint64_t *pMask8 = (uint64_t *)maskAlignedArray; while (loop--) { uint64_t *pSource8 = (uint64_t *)source; *pSource8 ^= *pMask8; source += 8; } // // Apply mask to remaining data. // uint8_t *pmaskAlignedArray = maskAlignedArray; length %= 8; while (length--) { *source++ ^= *pmaskAlignedArray++; } return NULL; } napi_value Init(napi_env env, napi_value exports) { napi_status status; napi_value mask; napi_value unmask; status = napi_create_function(env, NULL, 0, Mask, NULL, &mask); assert(status == napi_ok); status = napi_create_function(env, NULL, 0, Unmask, NULL, &unmask); assert(status == napi_ok); status = napi_set_named_property(env, exports, "mask", mask); assert(status == napi_ok); status = napi_set_named_property(env, exports, "unmask", unmask); assert(status == napi_ok); return exports; } NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)
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