/* Menes - C++ High-Level Utility Library
 * Copyright (C) 2003-2005  Jay Freeman (saurik)
*/

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "cxx/standard.hh"
#pragma hdrstop("build/cxx/standard.pch")

#include "api/zlib/deflate.hpp"

namespace api {
namespace Z {

bool DeflateWriter::Write_(int flag) {
    stream_.next_in = reinterpret_cast<uint8_t *>(buffer_.Begin());
    stream_.avail_in = buffer_.GetSize();

#ifdef CFG_SYMBOL_COMPRESSBOUND
    size_t bound(::compressBound(buffer_.GetSize()));
#else
    // XXX: is there some specific rounding I should do?
    size_t bound(static_cast<size_t>(buffer_.GetSize() * 1.001) + 12);
#endif

    ext::Buffer buffer(bound);
    stream_.next_out = reinterpret_cast<uint8_t *>(buffer.Begin());
    stream_.avail_out = buffer.GetSize();

    int zerr(::deflate(&stream_, flag));
    if (zerr != Z_OK && zerr != Z_STREAM_END)
        throw Error(zerr);

    writer_->WriteFully(buffer.Begin(), buffer.GetSize() - stream_.avail_out);

    size_t written(buffer_.GetSize() - stream_.avail_in);
    buffer_.RemoveAllAt(buffer_.Begin(), written);

    return zerr == Z_STREAM_END;
}

DeflateWriter::DeflateWriter(const _R<ios::Writer> &writer) :
    writer_(writer)
{
    ::memset(&stream_, 0, sizeof(z_stream));

    int zerr(::deflateInit(&stream_, Z_DEFAULT_COMPRESSION));
    if (zerr != Z_OK)
        throw Error(zerr);
}

DeflateWriter::~DeflateWriter() {
    while (!Write_(Z_FINISH));
    _assert(buffer_.IsEmpty());

    int zerr(::deflateEnd(&stream_));
    if (zerr != Z_OK)
        throw Error(zerr);
}

size_t DeflateWriter::Write(const byte_t *data, size_t length) {
    buffer_.InsertAllLast(data, length);
    Write_(Z_NO_FLUSH);
    return length;
}

void DeflateWriter::Flush() {
}

} }