/** @file
  Declaration of the boot file download function.

Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under 
the terms and conditions of the BSD License that accompanies this distribution.  
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.                                          
    
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef __EFI_HTTP_BOOT_HTTP_H__
#define __EFI_HTTP_BOOT_HTTP_H__

#define HTTP_BOOT_REQUEST_TIMEOUT            5000      // 5 seconds in uints of millisecond.
#define HTTP_BOOT_BLOCK_SIZE                 1500

#define HTTP_FIELD_NAME_USER_AGENT           "User-Agent"
#define HTTP_FIELD_NAME_HOST                 "Host"
#define HTTP_FIELD_NAME_ACCEPT               "Accept"


#define HTTP_USER_AGENT_EFI_HTTP_BOOT        "UefiHttpBoot/1.0"

//
// Record the data length and start address of a data block.
//
typedef struct {
  LIST_ENTRY                 Link;        // Link to the EntityDataList in HTTP_BOOT_CACHE_CONTENT
  UINT8                      *Block;      // If NULL, the data is in previous data block.
  UINT8                      *DataStart;  // Point to somewhere in the Block
  UINTN                      DataLength;
} HTTP_BOOT_ENTITY_DATA;

//
// Structure for a cache item
//
typedef struct {
  LIST_ENTRY                 Link;            // Link to the CacheList in driver's private data.
  EFI_HTTP_REQUEST_DATA      *RequestData;
  HTTP_IO_RESOPNSE_DATA      *ResponseData;   // Not include any message-body data.
  UINTN                      EntityLength;
  LIST_ENTRY                 EntityDataList;  // Entity data (message-body)
} HTTP_BOOT_CACHE_CONTENT;

//
// Callback data for HTTP_BODY_PARSER_CALLBACK()
//
typedef struct {
  EFI_STATUS                 Status;
  //
  // Cache info.
  //
  HTTP_BOOT_CACHE_CONTENT    *Cache;
  BOOLEAN                    NewBlock;
  UINT8                      *Block;

  //
  // Caller provided buffer to load the file in.
  //
  UINTN                      CopyedSize;
  UINTN                      BufferSize;
  UINT8                      *Buffer;
} HTTP_BOOT_CALLBACK_DATA;

/**
  Discover all the boot information for boot file.

  @param[in, out]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully obtained all the boot information .
  @retval Others               Failed to retrieve the boot information.

**/
EFI_STATUS
HttpBootDiscoverBootInfo (
  IN OUT HTTP_BOOT_PRIVATE_DATA   *Private
  );

/**
  Create a HttpIo instance for the file download.

  @param[in]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully created.
  @retval Others               Failed to create HttpIo.

**/
EFI_STATUS
HttpBootCreateHttpIo (
  IN     HTTP_BOOT_PRIVATE_DATA       *Private
  );

/**
  This function download the boot file by using UEFI HTTP protocol.
  
  @param[in]       Private         The pointer to the driver's private data.
  @param[in]       HeaderOnly      Only request the response header, it could save a lot of time if
                                   the caller only want to know the size of the requested file.
  @param[in, out]  BufferSize      On input the size of Buffer in bytes. On output with a return
                                   code of EFI_SUCCESS, the amount of data transferred to
                                   Buffer. On output with a return code of EFI_BUFFER_TOO_SMALL,
                                   the size of Buffer required to retrieve the requested file.
  @param[out]      Buffer          The memory buffer to transfer the file to. IF Buffer is NULL,
                                   then the size of the requested file is returned in
                                   BufferSize.

  @retval EFI_SUCCESS              The file was loaded.
  @retval EFI_INVALID_PARAMETER    BufferSize is NULL or Buffer Size is not NULL but Buffer is NULL.
  @retval EFI_OUT_OF_RESOURCES     Could not allocate needed resources
  @retval EFI_BUFFER_TOO_SMALL     The BufferSize is too small to read the current directory entry.
                                   BufferSize has been updated with the size needed to complete
                                   the request.
  @retval Others                   Unexpected error happened.

**/
EFI_STATUS
HttpBootGetBootFile (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private,
  IN     BOOLEAN                  HeaderOnly,
  IN OUT UINTN                    *BufferSize,
     OUT UINT8                    *Buffer
  );

/**
  Clean up all cached data.

  @param[in]          Private         The pointer to the driver's private data.

**/
VOID
HttpBootFreeCacheList (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private
  );

#endif