// Copyright 2004 Sony Online Entertainment, all rights reserved.
// Author: Jeff Petersen

#include <string.h>

#include "UdpMisc.h"
#include "UdpLogicalPacket.h"


namespace UdpLibrary
{

    ////////////////////////////////////////////////////////////////////////////////////////////////////
    // UdpMisc functions
    ////////////////////////////////////////////////////////////////////////////////////////////////////

int UdpMisc::SyncStampShortDeltaTime(udp_ushort stamp1, udp_ushort stamp2)
{
    udp_ushort delta = (udp_ushort)(stamp1 - stamp2);
    if (delta > 0x7fff)
        return((int)(0xffff - delta));
    return((int)delta);
}

int UdpMisc::SyncStampLongDeltaTime(udp_uint stamp1, udp_uint stamp2)
{
    udp_uint delta = stamp1 - stamp2;
    if (delta > 0x7fffffff)
        return((int)(0xffffffff - delta));
    return((int)delta);
}

int UdpMisc::Random(int *seed)
{
    int hi = *seed / 127773;
    int lo = *seed % 127773;
    int t = lo * 16807 - hi * 2836 + 123;
    *seed = (t > 0) ? t : (t + 2147483647);
    return(*seed);
}

unsigned long int UdpMisc::Crc32(const void *buffer, int bufferLen, int encryptValue)
{
    static unsigned crc32_table[256] = { 
    0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
    0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
    0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
    0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
    0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
    0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
    0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
    0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
    0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
    0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
    0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
    0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
    0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
    0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
    0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
    0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
    0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
    0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
    0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
    0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
    0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
    0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
    0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
    0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
    0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
    0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
    0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
    0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
    0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
    0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
    0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
    0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
    0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};

    unsigned long int crc = 0xffffffff;
    crc = ((crc >> 8) & 0x00FFFFFFL) ^ crc32_table[(crc ^ (encryptValue & 0xff)) & 0x000000FFL];
    crc = ((crc >> 8) & 0x00FFFFFFL) ^ crc32_table[(crc ^ ((encryptValue >> 8) & 0xff)) & 0x000000FFL];
    crc = ((crc >> 8) & 0x00FFFFFFL) ^ crc32_table[(crc ^ ((encryptValue >> 16) & 0xff)) & 0x000000FFL];
    crc = ((crc >> 8) & 0x00FFFFFFL) ^ crc32_table[(crc ^ ((encryptValue >> 24) & 0xff)) & 0x000000FFL];

    const udp_uchar *bufPtr = (const udp_uchar *)buffer;
    const udp_uchar *endPtr = (const udp_uchar *)buffer + bufferLen;
    while (bufPtr < endPtr)
    {
        crc = ((crc >> 8) & 0x00FFFFFFL) ^ crc32_table[(crc ^ *bufPtr) & 0x000000FFL];
        bufPtr++;
    }
    crc = ~crc;

    return(crc);
}

void *UdpMisc::SmartResize(void *ptr, int bytes, int round)
{
    enum { cAlignment = sizeof(int) };

        // rounding stuff for speed
    bytes = ((bytes + round - 1) / round) * round;

    if (bytes == 0)
    {
        if (ptr != nullptr)
        {
            free((udp_uchar *)ptr - cAlignment);
        }
        return(nullptr);
    }

    udp_uchar *ptr2;
    if (ptr == nullptr)
    {
        ptr2 = (udp_uchar *)malloc(bytes + cAlignment);
        if (ptr2 == nullptr)
            return(nullptr);
        *(int *)ptr2 = bytes;
        return(ptr2 + cAlignment);
    }

    int oldBytes = *((int *)((udp_uchar *)ptr - cAlignment));
    if (bytes == oldBytes)
        return(ptr);

    ptr2 = (udp_uchar *)realloc((udp_uchar *)ptr - cAlignment, bytes + cAlignment);
    if (ptr2 == nullptr)
        return(nullptr);

    *(int *)ptr2 = bytes;
    return(ptr2 + cAlignment);
}

udp_uint UdpMisc::PutVariableValue(void *buffer, udp_uint value)
{
    udp_uchar *bufptr = (udp_uchar *)buffer;
    udp_uint store = (udp_uint)value;
    if (store < 254)
    {
        *bufptr = (udp_uchar)store;
        return(1);
    }
    else if (store < 0xffff)
    {
        *bufptr = 0xff;
        *(bufptr + 1) = (udp_uchar)(store >> 8);
        *(bufptr + 2) = (udp_uchar)(store & 0xff);
        return(3);
    }
    else
    {
        *bufptr = 0xff;
        *(bufptr + 1) = 0xff;
        *(bufptr + 2) = 0xff;
        *(bufptr + 3) = (udp_uchar)(store >> 24);
        *(bufptr + 4) = (udp_uchar)((store >> 16) & 0xff);
        *(bufptr + 5) = (udp_uchar)((store >> 8) & 0xff);
        *(bufptr + 6) = (udp_uchar)(store & 0xff);
        return(7);
    }
}

udp_uint UdpMisc::GetVariableValue(const void *buffer, udp_uint *value)
{
    const udp_uchar *bufptr = (const udp_uchar *)buffer;
    if (*bufptr == 0xff)
    {
        if (*(bufptr + 1) == 0xff && *(bufptr + 2) == 0xff)
        {
            *value = (udp_uint)((*(bufptr + 3) << 24) | (*(bufptr + 4) << 16) | (*(bufptr + 5) << 8) | *(bufptr + 6));
            return(7);
        }

        *value = (udp_uint)((*(bufptr + 1) << 8) | *(bufptr + 2));
        return(3);
    }

    *value = (udp_uint)*bufptr;
    return(1);
}

LogicalPacket *UdpMisc::CreateQuickLogicalPacket(const void *data, int dataLen, const void *data2, int dataLen2)
{
    enum { cQuickFactor = 128 };
    int totalDataLen = dataLen + dataLen2;
    int q = (totalDataLen - 1) / cQuickFactor;
    LogicalPacket *tlp;
    switch(q)
    {
        case 0:
            tlp = new FixedLogicalPacket<cQuickFactor>(nullptr, totalDataLen);
            break;
        case 1:
            tlp = new FixedLogicalPacket<cQuickFactor * 2>(nullptr, totalDataLen);
            break;
        case 2:
        case 3:
            tlp = new FixedLogicalPacket<cQuickFactor * 4>(nullptr, totalDataLen);
            break;
        case 4:
        case 5:
        case 6:
        case 7:
            tlp = new FixedLogicalPacket<cQuickFactor * 8>(nullptr, totalDataLen);
            break;
        default:
            tlp = new SimpleLogicalPacket(nullptr, totalDataLen);
            break;
    }

    udp_uchar *dest = (udp_uchar *)tlp->GetDataPtr();
    if (data != nullptr)
        memcpy(dest, data, dataLen);
    if (data2 != nullptr)
        memcpy(dest + dataLen, data2, dataLen2);
    return(tlp);
}

UdpPlatformAddress UdpMisc::GetHostByName(const char *hostName)
{
    static UdpPlatformDriver sDriver;
    UdpPlatformAddress ip;
    sDriver.GetHostByName(&ip, hostName);
    return(ip);
}

void UdpMisc::Sleep(int milliseconds)
{
    static UdpPlatformDriver sDriver;
    sDriver.Sleep(milliseconds);
}

UdpPlatformAddress UdpMisc::GetSelfAddress(bool preferNoRoute)
{
    static UdpPlatformDriver sDriver;
    UdpPlatformAddress ip;
    sDriver.GetSelfAddress(&ip, preferNoRoute);
    return(ip);
}


}   // namespace