mimetype.h

著名的加密软件的应用于电子邮件中

/*
 *  Functions to manage emsMIMEtype structures
 *  for use with Eudora EMS API under MS Windows.
 *
 *  Filename: mimetype.h
 *
 *  Last Edited: August 21, 1996
 *
 *  Author: Scott Manjourides
 *
 *  Copyright 1995, 1996 QUALCOMM Inc.
 *
 *  Send comments and questions to <[e-mail]>
 */

#ifndef EMS_MIMETYPE_H
#define EMS_MIMETYPE_H

#include <windows.h>
#include "ems-win.h"

/*
 *  Create an emsMIMEtype structure to hold MIME information. Only the
 *  type and subtype are set here, use add_mime_parameter() to add
 *  any name/value parameter pairs.
 *
 *  NOTE: All input strings are COPIED before permanent use. The user
 *        of this function is responsible for calling free_mime_type()
 *        on returned structure.
 *
 *  Args:
 *   mime_type    [IN] the main MIME type: e.g., "text", "application", "image"
 *   sub_type     [IN] the sub type: e.g., "plain", "octet-stream", "jpeg"
 *   mime_version [IN] the MIME verion number, if NULL will default to "1.0"
 *
 *  Returns: Pointer to the created emsMIMEtype structure, NULL if error.
 */
emsMIMEtypeP make_mime_type(const char *mime_type, const char *sub_type, const char *mime_version);

/*
 *  Create an emsMIMEtype structure to hold MIME information. Structure is
 *  initialized to values provided in RFC822 content-type header line. This
 *  includes all parameter name-value pairs.
 *   
 *  NOTE: The user of this function is responsible for calling
 *        free_mime_type() on returned structure.
 *
 *  Args:
 *   content_type [IN] The RFC822 content-type string to parse
 *
 *  Returns: Pointer to the created emsMIMEtype structure, NULL if error.
 */
emsMIMEtypeP parse_make_mime_type(const char *src);

/*
 *  Add a parameter to an existing emsMIMEtype structure. This structure
 *  should be created using make_mime_type().
 *
 *  NOTE: All input strings are COPIED before permanent use.
 *
 * Args:
 *   mimePtr [IN] Pointer to the emsMIMEtype structure to be added too
 *   name    [IN] Name of the parameter
 *   value   [IN] Value of the parameter
 *   
 *  Returns: Boolean (TRUE = success, FALSE = failure)
 */
int add_mime_parameter(emsMIMEtypeP mimePtr, const char *name, const char *value);

/*
 *  Remove a parameter from an existing emsMIMEtype structure. This structure
 *  should be created using make_mime_type().
 *
 *  NOTE: All input strings are COPIED before permanent use.
 *
 * Args:
 *   mimePtr [IN] Pointer to the emsMIMEtype structure to altered
 *   name    [IN] Name of the parameter to be removed
 *   
 *  Returns: Boolean (TRUE = success, FALSE = failure)
 */
int remove_mime_parameter(emsMIMEtypeP mimePtr, const char *name);

/*
 *  Free an emsMIMEtype structure, including all strings and parameters.
 *
 *  Args:
 *   mimePtr [IN] Pointer to the emsMIMEtype structure to be freed
 *
 *  No return value.
 */
void free_mime_type(emsMIMEtypeP mimePtr);

/*
 *  Convert an emsMIMEtype structure to a Content-Type header field line
 *  in the format specified by RFC 882.
 *
 *  NOTE: The user of this function is responsible for freeing the
 *        returned string.
 *
 *  Args:
 *   mimePtr [IN] Pointer to the emsMIMEtype structure
 *
 *  Returns: String containing header field; dynamically allocated.
 */
char *string_mime_type(emsMIMEtypeP mimePtr);

/*
 *  Pick out a specific parameter name-value pair from an emsMIMEtype
 *  structure. The match is case sensitive.
 *
 *  NOTE: The user of this function should NOT alter the returned string
 *        in any way -- it should be considered READ-ONLY.
 *
 *  Args:
 *   mimePtr   [IN] Pointer to the emsMIMEtype structure
 *   paramName [IN] Name of parameter to look for
 *
 *  Returns: String of the associated value or NULL if no match is found
 */
const char *get_mime_parameter(emsMIMEtypeP mimePtr, const char *paramName);

/*
 *  Check for a matching MIME type/subtype. If either type or subtype is
 *  NULL, then it won't be checked. If both are NULL, then TRUE is always
 *  returned.
 *
 *  Args:
 *   mimePtr   [IN] Pointer to the emsMIMEtype structure
 *   mime_type [IN] The major MIME type to check
 *   sub_type  [IN] The MIME subtype to check
 *  
 *  Returns: Boolean (TRUE if the MIME type matches, FALSE if not)
 */
int match_mime_type(emsMIMEtypeP mimePtr, const char *mime_type, const char *sub_type);

#endif /* EMS_MIMETYPE_H */