media/libstagefright/foundation/ByteUtils.cpp

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//#define LOG_NDEBUG 0
#define LOG_TAG "ByteUtils"

#include <media/stagefright/foundation/ByteUtils.h>

namespace android {

uint16_t U16_AT(const uint8_t *ptr) {
    return ptr[0] << 8 | ptr[1];
}

uint32_t U32_AT(const uint8_t *ptr) {
    return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
}

uint64_t U64_AT(const uint8_t *ptr) {
    return ((uint64_t)U32_AT(ptr)) << 32 | U32_AT(ptr + 4);
}

uint16_t U16LE_AT(const uint8_t *ptr) {
    return ptr[0] | (ptr[1] << 8);
}

uint32_t U32LE_AT(const uint8_t *ptr) {
    return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0];
}

uint64_t U64LE_AT(const uint8_t *ptr) {
    return ((uint64_t)U32LE_AT(ptr + 4)) << 32 | U32LE_AT(ptr);
}

// XXX warning: these won't work on big-endian host.
uint64_t ntoh64(uint64_t x) {
    return ((uint64_t)ntohl(x & 0xffffffff) << 32) | ntohl(x >> 32);
}

uint64_t hton64(uint64_t x) {
    return ((uint64_t)htonl(x & 0xffffffff) << 32) | htonl(x >> 32);
}

void MakeFourCCString(uint32_t x, char *s) {
    s[0] = x >> 24;
    s[1] = (x >> 16) & 0xff;
    s[2] = (x >> 8) & 0xff;
    s[3] = x & 0xff;
    s[4] = '\0';
}

}  // namespace android