xref: /dports/dns/yadifa/yadifa-2.5.3-10333/lib/dnscore/src/bytezarray_output_stream.c

/*------------------------------------------------------------------------------
 *
 * Copyright (c) 2011-2021, EURid vzw. All rights reserved.
 * The YADIFA TM software product is provided under the BSD 3-clause license:
 *
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 * 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.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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/** @defgroup streaming Streams
 *  @ingroup dnscore
 *  @brief
 *
 *
 *
 * @{
 *
 *----------------------------------------------------------------------------*/
#include "dnscore/dnscore-config.h"
#include <stdio.h>
#include <stdlib.h>

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

#define BYTE_ARRAY_OUTPUT_STREAM_TAG 0x534f4142 /* BAOS */
#define BYTE_ARRAY_OUTPUT_STREAM_DATA_TAG 0x41544144534f4142 /* BAOSDATA */
#define BYTE_ARRAY_OUTPUT_STREAM_BUFF_TAG 0x46465542534f4142 /* BAOSBUFF */

#define BYTEARRAY_STARTSIZE 1024

typedef struct bytezarray_output_stream_data bytezarray_output_stream_data;

/**
 * @NOTE: if this changes, take care that bytezarray_output_stream_context in the header file has at least the SAME SIZE
 */

struct bytezarray_output_stream_data
{
    u8* buffer;
    u32 buffer_size;
    u32 buffer_offset;
    u8 flags;
};

static ya_result
bytezarray_output_stream_write(output_stream* stream, const u8* buffer, u32 len)
{
    if(len == 0)
    {
        return 0;
    }

    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;

    u32 remaining = data->buffer_size - data->buffer_offset;

    if(len > remaining)
    {
        /* Either we can resize, either we have to trunk */

        if((data->flags & BYTEARRAY_DYNAMIC) != 0)
        {
            u8* newbuffer;
            u32 newsize = data->buffer_size;

            do
            {
                newsize = newsize * 2;
            }
            while(newsize < data->buffer_size + len);

            ZALLOC_OBJECT_ARRAY_OR_DIE(newbuffer, u8, newsize, BYTE_ARRAY_OUTPUT_STREAM_TAG);

            MEMCOPY(newbuffer, data->buffer, data->buffer_offset);

            if((data->flags & BYTEARRAY_OWNED) != 0)
            {
                ZFREE_ARRAY(data->buffer, data->buffer_size);
            }

            data->buffer = newbuffer;
            data->buffer_size = newsize;

            data->flags |= BYTEARRAY_OWNED;
        }
        else
        {
            len = remaining;
        }
    }

    MEMCOPY(&data->buffer[data->buffer_offset], buffer, len);
    data->buffer_offset += len;

    return len;
}

static ya_result
bytezarray_output_stream_flush(output_stream* stream)
{
    (void)stream;

    return SUCCESS;
}

static void
bytezarray_output_stream_close(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;

    if((data->flags & BYTEARRAY_OWNED) != 0)
    {
#if DEBUG
        memset(data->buffer, 0xe5, data->buffer_size);
#endif
        ZFREE_ARRAY(data->buffer, data->buffer_size);
    }

    if((data->flags & BYTEARRAY_ZALLOC_CONTEXT) != 0)
    {
        ZFREE(data, bytezarray_output_stream_data);
    }

    output_stream_set_void(stream);
}

static const output_stream_vtbl bytezarray_output_stream_vtbl =
{
    bytezarray_output_stream_write,
    bytezarray_output_stream_flush,
    bytezarray_output_stream_close,
    "bytezarray_output_stream",
};

void
bytezarray_output_stream_init_ex_static(output_stream* out_stream, u8* array,u32 size, u8 flags, bytezarray_output_stream_context *ctx)
{
    bytezarray_output_stream_data *data = (bytezarray_output_stream_data*)ctx;

    if(array == NULL)
    {
        flags |= BYTEARRAY_OWNED;

        if(size == 0)
        {
            flags |= BYTEARRAY_DYNAMIC;

            size = BYTEARRAY_STARTSIZE;
        }

        ZALLOC_OBJECT_ARRAY_OR_DIE(array, u8, size, BYTE_ARRAY_OUTPUT_STREAM_BUFF_TAG);
    }

    data->buffer = array;
    data->buffer_size = size;
    data->buffer_offset = 0;
    data->flags = flags;

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

void
bytezarray_output_stream_init_ex(output_stream* out_stream, u8* array, u32 size, u8 flags)
{
    bytezarray_output_stream_data* data;

    ZALLOC_OBJECT_OR_DIE( data, bytezarray_output_stream_data, BYTE_ARRAY_OUTPUT_STREAM_DATA_TAG);

    flags |= BYTEARRAY_ZALLOC_CONTEXT;

    bytezarray_output_stream_init_ex_static(out_stream, array, size, flags, (bytezarray_output_stream_context*)data);
}

void
bytezarray_output_stream_init(output_stream* out_stream, u8* array, u32 size)
{
    bytezarray_output_stream_init_ex(out_stream, array, size, 0);
}

void
bytezarray_output_stream_reset(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;
    data->buffer_offset = 0;
}

u32
bytezarray_output_stream_size(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;
    return data->buffer_offset;
}

u32
bytezarray_output_stream_buffer_size(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;
    return data->buffer_size;
}

u32
bytezarray_output_stream_buffer_offset(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;
    return data->buffer_offset;
}

u8*
bytezarray_output_stream_buffer(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;

    return data->buffer;
}

u8*
bytezarray_output_stream_detach(output_stream* stream)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;

    data->flags &= ~BYTEARRAY_OWNED;

    return data->buffer;
}

void
bytezarray_output_stream_set(output_stream* stream, u8 *buffer, u32 buffer_size, bool owned)
{
    bytezarray_output_stream_data* data = (bytezarray_output_stream_data*)stream->data;
    if((data->buffer != buffer) && ((data->flags & BYTEARRAY_OWNED) != 0))
    {
        ZFREE_ARRAY(data->buffer, data->buffer_size);
    }
    data->buffer = buffer;
    data->buffer_offset = buffer_size;
    data->buffer_size = buffer_size;
    data->flags = (data->flags & BYTEARRAY_ZALLOC_CONTEXT) | ((owned)?BYTEARRAY_OWNED:0);
}

/** @} */