/*

* Copyright (c) 1999 - 2001 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

/*****************************************************************

**    File name:  NW_Buffer.c

**    Part of: Buffer

**    Version: 3/16/99      Initial version

**    Description:  Provides the interface to a managerd buffer of bytes.

**                  The buffer contains an allocated size and an in use 

**                  size (length)  and also a pointer to a data array.

******************************************************************/

/*

**-------------------------------------------------------------------------

**  Include Files

**-------------------------------------------------------------------------

*/

#include "nwx_buffer.h"

#include "nwx_mem.h"

#include "nwx_assert.h"

#include "nwx_string.h"

#include "BrsrStatusCodes.h"

/*

**-------------------------------------------------------------------------

**  Constants

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  Internal Types

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  Macros

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  Internal Prototypes

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  File Scoped Static Variables

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  Global Variable Definitions

**-------------------------------------------------------------------------

*/

/*

**-------------------------------------------------------------------------

**  Internal Functions

**-------------------------------------------------------------------------

*/

static TBrowserStatusCode Resize_Data(NW_Buffer_t *buffer, const NW_Uint32 len)

{

  void *temp;

  if (buffer->allocatedLength < len) {

    temp = NW_Mem_Malloc(len);

    if (temp == NULL)

      return KBrsrOutOfMemory;

    NW_Mem_Free(buffer->data);

    buffer->length = 0;

    buffer->allocatedLength = len;

    buffer->data = (NW_Byte*) temp;

  }

  return KBrsrSuccess;

}

/*

**-------------------------------------------------------------------------

**  External Public (Exported) Functions

**-------------------------------------------------------------------------

*/

/*****************************************************************

**  Name:  NW_Buffer_New

**  Description:  creates a new buffer

**  Parameters:   size  - size to allocate

**  Return Value: pointer to the new buffer

******************************************************************/

NW_Buffer_t *NW_Buffer_New(const NW_Uint32 size)    

{

  NW_Buffer_t *buffer;

  buffer = (NW_Buffer_t*) NW_Mem_Malloc(sizeof(NW_Buffer_t));

  if (buffer != NULL) {

    buffer->length = 0;

    buffer->allocatedLength = size;

    buffer->data = NULL;

    if (size > 0) {

      buffer->data = (NW_Byte*) NW_Mem_Malloc(size);

      if (buffer->data == NULL) {

        NW_Mem_Free(buffer);

        return NULL;

      }

    }

  }

  return buffer;

}

/*****************************************************************

**  Name:  NW_Buffer_Free

**  Description:  frees the space allocated for a buffer

**  Parameters:   *buffer - the buffer to free

**  Return Value: void 

******************************************************************/

void NW_Buffer_Free(NW_Buffer_t *buffer)    

{

  if (buffer != NULL) {

    if (buffer->data != NULL) {

      NW_Mem_Free(buffer->data);

      buffer->data = NULL;

    }

    NW_Mem_Free(buffer);

  }

  return;

}

/*****************************************************************

**  Name:  NW_Buffer_FreeNotData

**  Description:  free the space allocated for a buffer. 

**  Parameters:   *buffer - the buffer to free

**  Return Value: void 

**  Notes:  This does not free the data

******************************************************************/

void NW_Buffer_FreeNotData(NW_Buffer_t *buffer)

{

  if (buffer != NULL) {

    buffer->data = NULL;

    NW_Mem_Free(buffer);

  }

  return;

}

/*****************************************************************

**  Name:  NW_Buffer_CopyStr

**  Description:  Copy NULL terminated string into buffer and adjust 

**                length.  If necessary, reallocate space.

**  Parameters:   *buffer - the buffer to copy to

**                *str - the string to copy from

**  Return Value: KBrsrSuccess if succeeds, else KBrsrOutOfMemory 

******************************************************************/

TBrowserStatusCode NW_Buffer_CopyStr(NW_Buffer_t *buffer, const NW_Ucs2 *str)

{

  NW_Uint16 len;

  NW_ASSERT(buffer != NULL);

  NW_ASSERT(str != NULL);

  len = (NW_Uint16)NW_Str_Strsize(str);

  if (Resize_Data(buffer, len) == KBrsrOutOfMemory)

    return KBrsrOutOfMemory;

  NW_Mem_memcpy(buffer->data, str, len);

  buffer->length = len;

  return KBrsrSuccess;

}

/*****************************************************************

**  Name:  NW_Buffer_CopyBuffers

**  Description:  Copy NW_Buffer into buffer (NW_Buffer) 

**                and adjust length. If necessary, reallocate space.

**  Parameters:   *to - the buffer to copy to

**                *from - the buffer to copy from

**  Return Value: KBrsrSuccess if succeeds, else KBrsrOutOfMemory 

******************************************************************/

TBrowserStatusCode NW_Buffer_CopyBuffers(NW_Buffer_t *to, const NW_Buffer_t *from)

{

  NW_ASSERT(to != NULL);

  NW_ASSERT(from != NULL);

  if (Resize_Data(to, from->length) == KBrsrOutOfMemory)

    return KBrsrOutOfMemory;

  NW_Mem_memcpy(to->data, from->data, from->length);

  to->length = from->length;

  return KBrsrSuccess;

}

/*****************************************************************

**  Name:  NW_Buffer_AppendBuffers

**  Description:  Append NW_Buffer into buffer (NW_Buffer) 

**                and adjust length. If necessary, reallocate space.

**  Parameters:   *to - the buffer to copy to

**                *from - the buffer to copy from

**  Return Value: KBrsrSuccess if succeeds, else KBrsrOutOfMemory 

******************************************************************/

TBrowserStatusCode NW_Buffer_AppendBuffers(NW_Buffer_t *to, const NW_Buffer_t *from)

  {

  NW_ASSERT( to != NULL );

  NW_ASSERT( from != NULL );

  if( to->allocatedLength < to->length + from->length ) 

    {

    void* temp;

    // resize

    temp = NW_Mem_Malloc( to->length + from->length );

    if( temp == NULL )

      {

      return KBrsrOutOfMemory;

      }

    // copy old buffer

    NW_Mem_memcpy( temp, to->data, to->length );

    // free old buffer

    NW_Mem_Free( to->data );

    // set new buffer

    to->data = (NW_Byte*)temp;

    to->allocatedLength = to->length + from->length;

    }

  NW_Mem_memcpy( to->data + to->length, from->data, from->length );

  to->length = to->length + from->length;

  return KBrsrSuccess;

  }

/*****************************************************************

**  Name:  NW_Buffer_SetData

**  Description:  Set NULL terminated ascii string into buffer and  

**                adjust length.

**  Parameters:   *buffer - the buffer to copy to

**                *str - the string to set into buffer

**  Return Value: void 

******************************************************************/

void NW_Buffer_SetData(NW_Buffer_t *buffer, char *str)

{

  NW_Uint32 len;

  NW_ASSERT(buffer != NULL);

  NW_ASSERT(str != NULL);

  if(buffer->data != NULL) {

    NW_Mem_Free(buffer->data);

  } 

  len = (NW_Asc_strlen(str) + 1) * sizeof(char);

  buffer->length = len;

  buffer->allocatedLength = len;

  buffer->data = (NW_Byte *)str;

  return;

}