/*------------------------------------------------------------------------------
 *
 * Copyright (c) 2011-2016, EURid. All rights reserved.
 * The YADIFA TM software product is provided under the BSD 3-clause license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *        * Redistributions of source code must retain the above copyright 
 *          notice, this list of conditions and the following disclaimer.
 *        * 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.
 *        * Neither the name of EURid nor the names of its contributors may be 
 *          used to endorse or promote products derived from this software 
 *          without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 *
 *------------------------------------------------------------------------------
 *
 */
/** @defgroup streaming Streams
 *  @ingroup dnscore
 *  @brief
 *
 *
 *
 * @{
 *
 *----------------------------------------------------------------------------*/
#include "dnscore/dnscore-config.h"
#include <stdio.h>
#include <stdlib.h>

#include "dnscore/bytearray_input_stream.h"
#include "dnscore/zalloc.h"



#define BYTE_ARRAY_INPUT_STREAM_TAG         0x53494142          // BAIS
#define BYTE_ARRAY_INPUT_STREAM_DATA_TAG    0x4154414453494142  // BAISDATA

typedef struct bytearray_input_stream_data bytearray_input_stream_data;

/* flags */

struct bytearray_input_stream_data
{
    const u8* buffer;
    u32 offset;
    u32 size;
    bool own_buffer;
};

static ya_result
bytearray_input_stream_read(input_stream* stream, u8 *buffer, u32 len)
{
    if(len == 0)
    {
        return 0;
    }

    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;
    
    u32 remaining = data->size - data->offset;
    
    if(len > remaining)
    {
        if(remaining == 0)
        {
            return 0; /* EOF */
        }
        
        len = remaining;
    }
    
    const u8* src = &data->buffer[data->offset];
    
    MEMCOPY(buffer, src, len);
    
    data->offset += len;

    return len;
}

static ya_result
bytearray_input_stream_skip(input_stream* stream, u32 len)
{
    if(len == 0)
    {
        return 0;
    }

    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;
    
    u32 remaining = data->size - data->offset;
    
    if(len > remaining)
    {
        if(remaining == 0)
        {
            return 0; /* EOF */
        }
        
        len = remaining;
    }
    
    data->offset += len;

    return len;
}

static void
bytearray_input_stream_close(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;

    if(data->own_buffer)
    {

        free((void*)data->buffer);
    }

        
    ZFREE(data,bytearray_input_stream_data);

    input_stream_set_void(stream);
}

static const input_stream_vtbl bytearray_input_stream_vtbl = {
    bytearray_input_stream_read,
    bytearray_input_stream_skip,
    bytearray_input_stream_close,
    "bytearray_input_stream",
};

void
bytearray_input_stream_init_const(input_stream* out_stream, const u8* array, u32 size)
{
    bytearray_input_stream_data* data;

    ZALLOC_OR_DIE(bytearray_input_stream_data*, data, bytearray_input_stream_data, BYTE_ARRAY_INPUT_STREAM_DATA_TAG);

    data->buffer = array;
    data->offset = 0;
    data->size = size;
    data->own_buffer = FALSE;
    


    out_stream->data = data;
    out_stream->vtbl = &bytearray_input_stream_vtbl;
}

void
bytearray_input_stream_init(input_stream* out_stream, u8* array, u32 size, bool owned)
{
    bytearray_input_stream_data* data;

    ZALLOC_OR_DIE(bytearray_input_stream_data*, data, bytearray_input_stream_data, BYTE_ARRAY_INPUT_STREAM_DATA_TAG);

    data->buffer = array;
    data->offset = 0;
    data->size = size;
    data->own_buffer = owned;
    


    out_stream->data = data;
    out_stream->vtbl = &bytearray_input_stream_vtbl;
}

void
bytearray_input_stream_reset(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;
    data->offset = 0;
}

u32
bytearray_input_stream_offset(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;
    return data->offset;
}

u32
bytearray_input_stream_size(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;
    return data->size;
}

const u8*
bytearray_input_stream_buffer(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;

    return data->buffer;
}

u8*
bytearray_input_stream_detach(input_stream* stream)
{
    bytearray_input_stream_data* data = (bytearray_input_stream_data*)stream->data;

    data->own_buffer = FALSE;

    return (u8*)data->buffer;
}

/** @} */

/*----------------------------------------------------------------------------*/

