/***************************************************************************
 *   crengine-ng                                                           *
 *   Copyright (C) 2007-2013,2015 Vadim Lopatin <coolreader.org@gmail.com> *
 *   Copyright (C) 2010 Kirill Erofeev <erofeev.info@gmail.com>            *
 *   Copyright (C) 2020 poire-z <poire-z@users.noreply.github.com>         *
 *   Copyright (C) 2020,2021 Aleksey Chernov <valexlin@gmail.com>          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU General Public License           *
 *   as published by the Free Software Foundation; either version 2        *
 *   of the License, or (at your option) any later version.                *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,            *
 *   MA 02110-1301, USA.                                                   *
 ***************************************************************************/

/**
 * \file props.cpp
 * \brief properties container
 */

#include <crprops.h>
#include <lvserialbuf.h>
#include <lvstreamutils.h>

#include <stdio.h>

//============================================================================
// CRPropContainer declarations
//============================================================================

class CRPropItem
{
private:
    lString8 _name;
    lString32 _value;
public:
    CRPropItem(const char* name, const lString32 value)
            : _name(name)
            , _value(value) { }
    CRPropItem(const CRPropItem& v)
            : _name(v._name)
            , _value(v._value) { }
    CRPropItem& operator=(const CRPropItem& v) {
        _name = v._name;
        _value = v._value;
        return *this;
    }
    const char* getName() const {
        return _name.c_str();
    }
    const lString32& getValue() const {
        return _value;
    }
    void setValue(const lString32& v) {
        _value = v;
    }
};

/// set contents from specified properties
void CRPropAccessor::set(const CRPropRef& v) {
    clear();
    int sz = v->getCount();
    for (int i = 0; i < sz; i++)
        setString(v->getName(i), v->getValue(i));
}

/// calc props1 - props2
CRPropRef operator-(CRPropRef props1, CRPropRef props2) {
    CRPropRef v = LVCreatePropsContainer();
    int cnt1 = props1->getCount();
    int cnt2 = props2->getCount();
    int p1 = 0;
    int p2 = 0;
    while ((p1 <= cnt1 && p2 <= cnt2) && (p1 < cnt1 || p2 < cnt2)) {
        if (p1 == cnt1) {
            break;
        } else if (p2 == cnt2) {
            v->setString(props1->getName(p1), props1->getValue(p1));
            p1++;
        } else {
            int res = lStr_cmp(props1->getName(p1), props2->getName(p2));
            if (res < 0) {
                v->setString(props1->getName(p1), props1->getValue(p1));
                p1++;
            } else if (res == 0) {
                p1++;
                p2++;
            } else { // ( res>0 )
                p2++;
            }
        }
    }
    return v;
}
/// calc props1 | props2
CRPropRef operator|(CRPropRef props1, CRPropRef props2) {
    CRPropRef v = LVCreatePropsContainer();
    int cnt1 = props1->getCount();
    int cnt2 = props2->getCount();
    int p1 = 0;
    int p2 = 0;
    while ((p1 <= cnt1 && p2 <= cnt2) && (p1 < cnt1 || p2 < cnt2)) {
        if (p1 == cnt1) {
            v->setString(props2->getName(p2), props2->getValue(p2));
            p2++;
        } else if (p2 == cnt2) {
            v->setString(props1->getName(p1), props1->getValue(p1));
            p1++;
        } else {
            int res = lStr_cmp(props1->getName(p1), props2->getName(p2));
            if (res < 0) {
                v->setString(props1->getName(p1), props1->getValue(p1));
                p1++;
            } else if (res == 0) {
                v->setString(props1->getName(p1), props1->getValue(p1));
                p1++;
                p2++;
            } else { // ( res>0 )
                v->setString(props2->getName(p2), props2->getValue(p2));
                p2++;
            }
        }
    }
    return v;
}
/// calc props1 & props2
CRPropRef operator&(CRPropRef props1, CRPropRef props2) {
    CRPropRef v = LVCreatePropsContainer();
    int cnt1 = props1->getCount();
    int cnt2 = props2->getCount();
    int p1 = 0;
    int p2 = 0;
    while ((p1 <= cnt1 && p2 <= cnt2) && (p1 < cnt1 || p2 < cnt2)) {
        if (p1 == cnt1) {
            break;
        } else if (p2 == cnt2) {
            break;
        } else {
            int res = lStr_cmp(props1->getName(p1), props2->getName(p2));
            if (res < 0) {
                p1++;
            } else if (res == 0) {
                v->setString(props1->getName(p1), props1->getValue(p1));
                p1++;
                p2++;
            } else { // ( res>0 )
                p2++;
            }
        }
    }
    return v;
}

/// returns added or changed items of props2 compared to props1
CRPropRef operator^(CRPropRef props1, CRPropRef props2) {
    CRPropRef v = LVCreatePropsContainer();
    int cnt1 = props1->getCount();
    int cnt2 = props2->getCount();
    int p1 = 0;
    int p2 = 0;
    while ((p1 <= cnt1 && p2 <= cnt2) && (p1 < cnt1 || p2 < cnt2)) {
        if (p1 == cnt1) {
            v->setString(props2->getName(p2), props2->getValue(p2));
            p2++;
        } else if (p2 == cnt2) {
            break;
        } else {
            int res = lStr_cmp(props1->getName(p1), props2->getName(p2));
            if (res < 0) {
                p1++;
            } else if (res == 0) {
                lString32 v1 = props1->getValue(p1);
                lString32 v2 = props2->getValue(p2);
                if (v1 != v2)
                    v->setString(props2->getName(p2), v2);
                p1++;
                p2++;
            } else { // ( res>0 )
                v->setString(props2->getName(p2), props2->getValue(p2));
                p2++;
            }
        }
    }
    return v;
}

class CRPropContainer: public CRPropAccessor
{
    friend class CRPropSubContainer;
private:
    LVPtrVector<CRPropItem> _list;
protected:
    lInt64 _revision;
    bool findItem(const char* name, int nameoffset, int start, int end, int& pos) const;
    bool findItem(const char* name, int& pos) const;
    void clear(int start, int end);
    CRPropContainer(const CRPropContainer& v)
            : _list(v._list) {
    }
public:
    /// get copy of property list
    virtual CRPropRef clone() const {
        return CRPropRef(new CRPropContainer(*this));
    }
    /// returns true if specified property exists
    virtual bool hasProperty(const char* propName) const {
        int pos;
        return findItem(propName, pos);
    }
    /// clear all items
    virtual void clear();
    /// returns property path in root container
    virtual const lString8& getPath() const;
    /// returns property item count in container
    virtual int getCount() const;
    /// returns property name by index
    virtual const char* getName(int index) const;
    /// returns property value by index
    virtual const lString32& getValue(int index) const;
    /// sets property value by index
    virtual void setValue(int index, const lString32& value);
    /// get string property by name, returns false if not found
    virtual bool getString(const char* propName, lString32& result) const;
    /// set string property by name
    virtual void setString(const char* propName, const lString32& value);
    /// get subpath container
    virtual CRPropRef getSubProps(const char* path);
    /// constructor
    CRPropContainer();
    /// virtual destructor
    virtual ~CRPropContainer();
};

/// set string property by name, if it's not set already
void CRPropAccessor::setStringDef(const char* propName, const char* defValue) {
    if (!hasProperty(propName))
        setString(propName, Utf8ToUnicode(lString8(defValue)));
}

/// set int property by name, if it's not set already
void CRPropAccessor::setIntDef(const char* propName, int value) {
    if (!hasProperty(propName))
        setInt(propName, value);
}

void CRPropAccessor::limitValueList(const char* propName, const char* values[]) {
    lString32 defValue = Utf8ToUnicode(lString8(values[0]));
    lString32 value;
    if (getString(propName, value)) {
        for (int i = 0; values[i]; i++) {
            lString32 v = Utf8ToUnicode(lString8(values[i]));
            if (v == value)
                return;
        }
    }
    setString(propName, defValue);
}

void CRPropAccessor::limitValueList(const char* propName, int values[], int valuesCount, int defValueIndex) {
    lString32 value;
    if (getString(propName, value)) {
        for (int i = 0; i < valuesCount; i++) {
            lString32 v = lString32::itoa(values[i]);
            if (v == value)
                return;
        }
    }
    if (defValueIndex < 0)
        defValueIndex = 0;
    else if (defValueIndex >= valuesCount)
        defValueIndex = valuesCount - 1;
    setInt(propName, values[defValueIndex]);
}

void CRPropAccessor::limitValueMinMax(const char* propName, int minValue, int maxValue, int defValue) {
    lString32 value;
    if (getString(propName, value)) {
        int intValue;
        if (value.atoi(intValue)) {
            if (intValue < minValue)
                setInt(propName, minValue);
            else if (intValue >= maxValue)
                setInt(propName, maxValue);
            return;
        }
    }
    setInt(propName, defValue);
}

//============================================================================
// CRPropAccessor methods
//============================================================================

lString32 CRPropAccessor::getStringDef(const char* propName, const char* defValue) const {
    lString32 value;
    if (!getString(propName, value))
        return lString32(defValue);
    else
        return value;
}

bool CRPropAccessor::getInt(const char* propName, int& result) const {
    lString32 value;
    if (!getString(propName, value))
        return false;
    return value.atoi(result);
}

int CRPropAccessor::getIntDef(const char* propName, int defValue) const {
    int v = 0;
    if (!getInt(propName, v))
        return defValue;
    else
        return v;
}

/// set int property as hex
void CRPropAccessor::setHex(const char* propName, lUInt32 value) {
    char s[16];
    sprintf(s, "0x%08X", value);
    setString(propName, Utf8ToUnicode(lString8(s)));
}

void CRPropAccessor::setInt(const char* propName, int value) {
    setString(propName, lString32::itoa(value));
}

bool CRPropAccessor::parseColor(lString32 value, lUInt32& result) {
    int n = 0;
    if (value.empty() || (value[0] != '#' && (value[0] != '0' || value[1] != 'x'))) {
        return false;
    }
    for (int i = value[0] == '#' ? 1 : 2; i < value.length(); i++) {
        lChar32 ch = value[i];
        if (ch >= '0' && ch <= '9')
            n = (n << 4) | (ch - '0');
        else if (ch >= 'a' && ch <= 'f')
            n = (n << 4) | (ch - 'a' + 10);
        else if (ch >= 'A' && ch <= 'F')
            n = (n << 4) | (ch - 'A' + 10);
        else
            return false;
    }
    result = (lUInt32)n;
    return true;
}

/// get color (#xxxxxx) property by name, returns false if not found
bool CRPropAccessor::getColor(const char* propName, lUInt32& result) const {
    //int n = 0;
    lString32 value;
    if (!getString(propName, value)) {
        //CRLog::debug("%s is not found", propName);
        return false;
    }
    return parseColor(value, result);
}

/// get color (#xxxxxx) property by name, returns default value if not found
lUInt32 CRPropAccessor::getColorDef(const char* propName, lUInt32 defValue) const {
    lUInt32 v = 0;
    //    CRLog::debug("getColorDef(%s), 0x%06x", propName, defValue);
    if (!getColor(propName, v))
        return defValue;
    else
        return v;
}

/// set color (#xxxxxx) property by name
void CRPropAccessor::setColor(const char* propName, lUInt32 value) {
    char s[12];
    sprintf(s, "#%06x", (int)value);
    setString(propName, lString32(s));
}

/// set argb color (#xxxxxx) property by name, if not set
void CRPropAccessor::setColorDef(const char* propName, lUInt32 defValue) {
    lUInt32 v = 0;
    if (!getColor(propName, v))
        setColor(propName, defValue);
}

/// get rect property by name, returns false if not found
bool CRPropAccessor::getRect(const char* propName, lvRect& result) const {
    lString32 value;
    if (!getString(propName, value))
        return false;
    lString8 s8 = UnicodeToUtf8(value);
    int n[4];
    if (sscanf(s8.c_str(), "{%d,%d,%d,%d}", n, n + 1, n + 2, n + 3) != 4)
        return false;
    result.left = n[0];
    result.top = n[1];
    result.right = n[2];
    result.bottom = n[3];
    return true;
}

/// get rect property by name, returns default value if not found
lvRect CRPropAccessor::getRectDef(const char* propName, const lvRect& defValue) const {
    lvRect v;
    if (!getRect(propName, v))
        return defValue;
    else
        return v;
}

/// set rect property by name
void CRPropAccessor::setRect(const char* propName, const lvRect& value) {
    char s[64];
    sprintf(s, "{%d,%d,%d,%d}", value.left, value.top, value.right, value.bottom);
    setString(propName, lString32(s));
}

/// get point property by name, returns false if not found
bool CRPropAccessor::getPoint(const char* propName, lvPoint& result) const {
    lString32 value;
    if (!getString(propName, value))
        return false;
    lString8 s8 = UnicodeToUtf8(value);
    int n[2];
    if (sscanf(s8.c_str(), "{%d,%d}", n, n + 1) != 2)
        return false;
    result.x = n[0];
    result.y = n[1];
    return true;
}

/// get point property by name, returns default value if not found
lvPoint CRPropAccessor::getPointDef(const char* propName, const lvPoint& defValue) const {
    lvPoint v;
    if (!getPoint(propName, v))
        return defValue;
    else
        return v;
}

/// set point property by name
void CRPropAccessor::setPoint(const char* propName, const lvPoint& value) {
    char s[64];
    sprintf(s, "{%d,%d}", value.x, value.y);
    setString(propName, lString32(s));
}

bool CRPropAccessor::getBool(const char* propName, bool& result) const {
    lString32 value;
    if (!getString(propName, value))
        return false;
    if (value == "true" || value == "TRUE" || value == "yes" || value == "YES" || value == "1") {
        result = true;
        return true;
    }
    if (value == "false" || value == "FALSE" || value == "no" || value == "NO" || value == "0") {
        result = false;
        return true;
    }
    return false;
}

bool CRPropAccessor::getBoolDef(const char* propName, bool defValue) const {
    bool v = 0;
    if (!getBool(propName, v))
        return defValue;
    else
        return v;
}

void CRPropAccessor::setBool(const char* propName, bool value) {
    setString(propName, lString32(value ? "1" : "0"));
}

void CRPropAccessor::setBoolDef(const char* propName, bool defValue) {
    bool boolVal;
    if (!getBool(propName, boolVal))
        setBool(propName, defValue);
}

bool CRPropAccessor::getInt64(const char* propName, lInt64& result) const {
    lString32 value;
    if (!getString(propName, value))
        return false;
    return value.atoi(result);
}

lInt64 CRPropAccessor::getInt64Def(const char* propName, lInt64 defValue) const {
    lInt64 v = 0;
    if (!getInt64(propName, v))
        return defValue;
    else
        return v;
}

void CRPropAccessor::setInt64(const char* propName, lInt64 value) {
    setString(propName, lString32::itoa(value));
}

CRPropAccessor::~CRPropAccessor() {
}

static lString8 addBackslashChars(lString8 str) {
    int i;
    bool found = false;
    for (i = 0; i < str.length(); i++) {
        char ch = str[i];
        if (ch == '\\' || ch == '\r' || ch == '\n' || ch == '\0') {
            found = true;
            break;
        }
    }
    if (!found)
        return str;
    lString8 out;
    out.reserve(str.length() + 1);
    for (i = 0; i < str.length(); i++) {
        char ch = str[i];
        switch (ch) {
            case '\\':
                out << "\\\\";
                break;
            case '\r':
                out << "\\r";
                break;
            case '\n':
                out << "\\n";
                break;
            case '\0':
                out << "\\0";
                break;
            default:
                out << ch;
        }
    }
    return out;
}

static lString8 removeBackslashChars(lString8 str) {
    int i;
    bool found = false;
    for (i = 0; i < str.length(); i++) {
        char ch = str[i];
        if (ch == '\\') {
            found = true;
            break;
        }
    }
    if (!found)
        return str;
    lString8 out;
    out.reserve(str.length() + 1);
    for (i = 0; i < str.length(); i++) {
        char ch = str[i];
        if (ch == '\\') {
            ch = str[++i];
            switch (ch) {
                case 'r':
                    out << '\r';
                    break;
                case 'n':
                    out << '\n';
                    break;
                case '0':
                    out << '\0';
                    break;
                default:
                    out << ch;
            }
        } else {
            out << ch;
        }
    }
    return out;
}

/// read from stream
bool CRPropAccessor::loadFromStream(LVStream* stream) {
    if (!stream || stream->GetMode() != LVOM_READ)
        return false;
    lvsize_t sz = stream->GetSize() - stream->GetPos();
    if (sz <= 0)
        return false;
    char* buf = new char[sz + 3];
    lvsize_t bytesRead = 0;
    if (stream->Read(buf, sz, &bytesRead) != LVERR_OK) {
        delete[] buf;
        return false;
    }
    buf[sz] = 0;
    char* p = buf;
    if ((unsigned char)buf[0] == 0xEF && (unsigned char)buf[1] == 0xBB && (unsigned char)buf[2] == 0xBF)
        p += 3;
    // read lines from buffer
    while (*p) {
        char* elp = p;
        char* eqpos = NULL;
        while (*elp && !(elp[0] == '\r' && elp[1] == '\n') && !(elp[0] == '\n')) {
            if (*elp == '=' && eqpos == NULL)
                eqpos = elp;
            elp++;
        }
        if (eqpos != NULL && eqpos > p && *elp != '#') {
            lString8 name(p, (int)(eqpos - p));
            lString8 value(eqpos + 1, (int)(elp - eqpos - 1));
            setString(name.c_str(), Utf8ToUnicode(removeBackslashChars(value)));
        }
        for (; *elp && *elp != '\r' && *elp != '\n'; elp++)
            ;
        p = elp;
        while (*p == '\r' || *p == '\n')
            p++;
    }
    // cleanup
    delete[] buf;
    return true;
}

/// save to stream
bool CRPropAccessor::saveToStream(LVStream* targetStream) {
    if (!targetStream || targetStream->GetMode() != LVOM_WRITE)
        return false;
    LVStreamRef streamref = LVCreateMemoryStream(NULL, 0, false, LVOM_WRITE);
    LVStream* stream = streamref.get();

    *stream << "\xEF\xBB\xBF";
    for (int i = 0; i < getCount(); i++) {
        *stream << getPath() << getName(i) << "=" << addBackslashChars(UnicodeToUtf8(getValue(i))) << "\r\n";
    }
    LVPumpStream(targetStream, stream);
    return true;
}

//============================================================================
// CRPropContainer methods
//============================================================================

CRPropContainer::CRPropContainer()
        : _revision(0) {
}

/// returns property path in root container
const lString8& CRPropContainer::getPath() const {
    return lString8::empty_str;
}

/// returns property item count in container
int CRPropContainer::getCount() const {
    return _list.length();
}

/// returns property name by index
const char* CRPropContainer::getName(int index) const {
    return _list[index]->getName();
}

/// returns property value by index
const lString32& CRPropContainer::getValue(int index) const {
    return _list[index]->getValue();
}

/// sets property value by index
void CRPropContainer::setValue(int index, const lString32& value) {
    _list[index]->setValue(value);
}

/// binary search
bool CRPropContainer::findItem(const char* name, int nameoffset, int start, int end, int& pos) const {
    int a = start;
    int b = end;
    while (a < b) {
        int c = (a + b) / 2;
        int res = lStr_cmp(name, _list[c]->getName() + nameoffset);
        if (res == 0) {
            pos = c;
            return true;
        } else if (res < 0) {
            b = c;
        } else {
            a = c + 1;
        }
    }
    pos = a;
    return false;
}

/// binary search
bool CRPropContainer::findItem(const char* name, int& pos) const {
    return findItem(name, 0, 0, _list.length(), pos);
}

/// get string property by name, returns false if not found
bool CRPropContainer::getString(const char* propName, lString32& result) const {
    int pos = 0;
    if (!findItem(propName, pos))
        return false;
    result = _list[pos]->getValue();
    return true;
}

/// clear all items
void CRPropContainer::clear() {
    _list.clear();
    _revision++;
}

/// set string property by name
void CRPropContainer::setString(const char* propName, const lString32& value) {
    int pos = 0;
    if (_list.empty() || !findItem(propName, pos)) {
        _list.insert(pos, new CRPropItem(propName, value));
        _revision++;
    } else {
        _list[pos]->setValue(value);
    }
}

/// virtual destructor
CRPropContainer::~CRPropContainer() {
}

void CRPropContainer::clear(int start, int end) {
    _list.erase(start, end - start);
    _revision++;
}

//============================================================================
// CRPropSubContainer methods
//============================================================================

class CRPropSubContainer: public CRPropAccessor
{
private:
    CRPropContainer* _root;
    lString8 _path;
    int _start;
    int _end;
    lInt64 _revision;
protected:
    void sync() const {
        CRPropSubContainer* ptr = (CRPropSubContainer*)this;
        if (ptr->_revision != ptr->_root->_revision) {
            ptr->_root->findItem(ptr->_path.c_str(), ptr->_start);
            ptr->_root->findItem((ptr->_path + "\x7F").c_str(), ptr->_end);
            ptr->_revision = ptr->_root->_revision;
        }
    }
public:
    /// get copy of property list
    virtual CRPropRef clone() const {
        CRPropContainer* v = new CRPropContainer();
        int cnt = getCount();
        v->_list.reserve(cnt);
        for (int i = 0; i < cnt; i++) {
            v->_list.add(new CRPropItem(getName(i), getValue(i)));
        }
        return CRPropRef(v);
    }
    /// returns true if specified property exists
    virtual bool hasProperty(const char* propName) const {
        lString32 str;
        return getString(propName, str);
    }
    CRPropSubContainer(CRPropContainer* root, lString8 path)
            : _root(root)
            , _path(path)
            , _start(0)
            , _end(0)
            , _revision(0) {
        sync();
    }
    /// clear all items
    virtual void clear() {
        sync();
        _root->clear(_start, _end);
    }
    /// returns property path in root container
    virtual const lString8& getPath() const {
        return _path;
    }
    /// returns property item count in container
    virtual int getCount() const {
        sync();
        return _end - _start;
    }
    /// returns property name by index
    virtual const char* getName(int index) const {
        sync();
        return _root->getName(index + _start) + _path.length();
    }
    /// returns property value by index
    virtual const lString32& getValue(int index) const {
        sync();
        return _root->getValue(index + _start);
    }
    /// sets property value by index
    virtual void setValue(int index, const lString32& value) {
        sync();
        _root->setValue(index + _start, value);
    }
    /// get string property by name, returns false if not found
    virtual bool getString(const char* propName, lString32& result) const {
        sync();
        int pos = 0;
        if (!_root->findItem(propName, _path.length(), _start, _end, pos))
            return false;
        result = _root->getValue(pos);
        return true;
    }
    /// set string property by name
    virtual void setString(const char* propName, const lString32& value) {
        sync();
        int pos = 0;
        if (!_root->findItem(propName, _path.length(), _start, _end, pos)) {
            _root->_list.insert(pos, new CRPropItem((_path + propName).c_str(), value));
            _root->_revision++;
            sync();
        } else {
            _root->_list[pos]->setValue(value);
        }
    }
    /// get subpath container
    virtual CRPropRef getSubProps(const char* path) {
        return _root->getSubProps((_path + path).c_str());
    }
    /// virtual destructor
    virtual ~CRPropSubContainer() {
    }
};

/// get subpath container
CRPropRef CRPropContainer::getSubProps(const char* path) {
    return CRPropRef(new CRPropSubContainer(this, lString8(path)));
}

/// factory function
CRPropRef LVCreatePropsContainer() {
    return CRPropRef(new CRPropContainer());
}

const char* props_magic = "PRPS";
const char* props_name_magic = "n=";
const char* props_value_magic = "v=";
/// serialize to byte buffer
void CRPropAccessor::serialize(SerialBuf& buf) {
    if (buf.error())
        return;
    int pos = buf.pos();
    buf.putMagic(props_magic);
    lInt32 sz = getCount();
    buf << sz;
    for (int i = 0; i < sz; i++) {
        buf.putMagic(props_name_magic);
        buf << lString8(getName(i));
        buf.putMagic(props_value_magic);
        buf << getValue(i);
    }
    buf.putCRC(buf.pos() - pos);
}

/// deserialize from byte buffer
bool CRPropAccessor::deserialize(SerialBuf& buf) {
    clear();
    if (buf.error())
        return false;
    int pos = buf.pos();
    if (!buf.checkMagic(props_magic))
        return false;
    lInt32 sz;
    buf >> sz;
    for (int i = 0; i < sz; i++) {
        lString8 nm;
        lString32 val;
        if (!buf.checkMagic(props_name_magic))
            return false;
        buf >> nm;
        if (!buf.checkMagic(props_value_magic))
            return false;
        buf >> val;
        setString(nm.c_str(), val);
        // CRLog::debug("  deserialized prop %s: %s", nm.c_str(), UnicodeToLocal(val).c_str());
    }
    buf.checkCRC(buf.pos() - pos);
    return !buf.error();
}
