1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 //#define LOG_NDEBUG 0 18 #define LOG_TAG "ByteUtils" 19 20 #include <media/stagefright/foundation/ByteUtils.h> 21 22 namespace android { 23 24 uint16_t U16_AT(const uint8_t *ptr) { 25 return ptr[0] << 8 | ptr[1]; 26 } 27 28 uint32_t U32_AT(const uint8_t *ptr) { 29 return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3]; 30 } 31 32 uint64_t U64_AT(const uint8_t *ptr) { 33 return ((uint64_t)U32_AT(ptr)) << 32 | U32_AT(ptr + 4); 34 } 35 36 uint16_t U16LE_AT(const uint8_t *ptr) { 37 return ptr[0] | (ptr[1] << 8); 38 } 39 40 uint32_t U32LE_AT(const uint8_t *ptr) { 41 return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0]; 42 } 43 44 uint64_t U64LE_AT(const uint8_t *ptr) { 45 return ((uint64_t)U32LE_AT(ptr + 4)) << 32 | U32LE_AT(ptr); 46 } 47 48 // XXX warning: these won't work on big-endian host. 49 uint64_t ntoh64(uint64_t x) { 50 return ((uint64_t)ntohl(x & 0xffffffff) << 32) | ntohl(x >> 32); 51 } 52 53 uint64_t hton64(uint64_t x) { 54 return ((uint64_t)htonl(x & 0xffffffff) << 32) | htonl(x >> 32); 55 } 56 57 void MakeFourCCString(uint32_t x, char *s) { 58 s[0] = x >> 24; 59 s[1] = (x >> 16) & 0xff; 60 s[2] = (x >> 8) & 0xff; 61 s[3] = x & 0xff; 62 s[4] = '\0'; 63 } 64 65 } // namespace android 66
