/*
	PIP - Platform Independent Primitives
	PIIODevice wrapper around PIString
	Ivan Pelipenko peri4ko@yandex.ru

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "piiostring.h"


//! \class PIIOString piiostring.h
//! \details
//! \~english
//! This class allow you to use PIString as PIIODevice, e.g. to pass it to PIConfig.
//!
//! \~russian
//! Этот класс позволяет использовать PIString в качестве PIIODevice, например,
//! для передачи в PIConfig.
//!


PIIOString::PIIOString(PIString * string, PIIODevice::DeviceMode mode) {
	open(string, mode);
}


PIIOString::PIIOString(const PIString & string) {
	open(string);
}


bool PIIOString::open(PIString * string, PIIODevice::DeviceMode mode) {
	str = string;
	return PIIODevice::open(mode);
}


bool PIIOString::open(const PIString & string) {
	str = const_cast<PIString*>(&string);
	return PIIODevice::open(PIIODevice::ReadOnly);
}


PIString PIIOString::readLine() {
	if (!canRead() || !str) return PIString();
	int np = pos;
	while (++np < str->size_s()) {
		if ((*str)[np] == '\n') break;
	}
	PIString ret = str->mid(pos, np - pos);
	pos = piMini(np + 1, str->size_s());
	return ret;
}


ssize_t PIIOString::readDevice(void * read_to, ssize_t max_size) {
	if (!canRead() || !str || max_size <= 0) return -1;
	PIString rs = str->mid(pos, max_size);
	pos += max_size;
	if (pos > str->size_s()) pos = str->size_s();
	const char * cc = rs.data();
	int ret = strlen(cc);
	memcpy(read_to, cc, ret);
	return ret;
}


ssize_t PIIOString::writeDevice(const void * data, ssize_t max_size) {
	if (!canWrite() || !str) return -1;
	//piCout << "write" << data;
	if (pos > str->size_s()) pos = str->size_s();
	PIString rs = PIString::fromUTF8((const char *)data);
	if (rs.size_s() > max_size) rs.resize(max_size);
	str->insert(pos, rs);
	pos += rs.size_s();
	return strlen((const char *)data);
}


int PIIOString::writeString(const PIString & string) {
	if (!canWrite() || !str) return -1;
	if (pos > str->size_s()) pos = str->size_s();
	str->insert(pos, string);
	pos += string.size_s();
	return string.size_s();
}


bool PIIOString::openDevice() {
	pos = 0;
	return (str != 0);
}