//========================================================================
//
// UnicodeMapFuncs.cc
//
// Copyright 2001-2003 Glyph & Cog, LLC
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2008 Koji Otani <sho@bbr.jp>
// Copyright (C) 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2018 Albert Astals Cid <aacid@kde.org>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#include "UnicodeMapFuncs.h"

int mapUTF8(Unicode u, char *buf, int bufSize)
{
    if (u <= 0x0000007f) {
        if (bufSize < 1) {
            return 0;
        }
        buf[0] = (char)u;
        return 1;
    } else if (u <= 0x000007ff) {
        if (bufSize < 2) {
            return 0;
        }
        buf[0] = (char)(0xc0 + (u >> 6));
        buf[1] = (char)(0x80 + (u & 0x3f));
        return 2;
    } else if (u <= 0x0000ffff) {
        if (bufSize < 3) {
            return 0;
        }
        buf[0] = (char)(0xe0 + (u >> 12));
        buf[1] = (char)(0x80 + ((u >> 6) & 0x3f));
        buf[2] = (char)(0x80 + (u & 0x3f));
        return 3;
    } else if (u <= 0x0010ffff) {
        if (bufSize < 4) {
            return 0;
        }
        buf[0] = (char)(0xf0 + (u >> 18));
        buf[1] = (char)(0x80 + ((u >> 12) & 0x3f));
        buf[2] = (char)(0x80 + ((u >> 6) & 0x3f));
        buf[3] = (char)(0x80 + (u & 0x3f));
        return 4;
    } else {
        return 0;
    }
}

int mapUTF16(Unicode u, char *buf, int bufSize)
{
    if (u <= 0xffff) {
        if (bufSize < 2) {
            return 0;
        }
        buf[0] = (char)((u >> 8) & 0xff);
        buf[1] = (char)(u & 0xff);
        return 2;
    } else if (u < 0x110000) {
        Unicode uu;

        /* using surrogate pair */
        if (bufSize < 4) {
            return 0;
        }
        uu = ((u - 0x10000) >> 10) + 0xd800;
        buf[0] = (char)((uu >> 8) & 0xff);
        buf[1] = (char)(uu & 0xff);
        uu = (u & 0x3ff) + 0xdc00;
        buf[2] = (char)((uu >> 8) & 0xff);
        buf[3] = (char)(uu & 0xff);
        return 4;
    } else {
        return 0;
    }
}