345 lines
13 KiB
C
345 lines
13 KiB
C
/*++
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Copyright (c) 1996-1999 Microsoft Corporation
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Module Name:
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winber.h Basic Encoding Rules (BER) API header file
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Abstract:
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This module is the header file for the 32 bit BER library on
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Windows NT and Windows 95.
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Updates :
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Environments :
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Win32 user mode
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--*/
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//
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// Only pull in this header file once.
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//
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#ifndef _WINBER_DEFINED_
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#define _WINBER_DEFINED_
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#if _MSC_VER > 1000
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#pragma once
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(_WINBER_)
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#define WINBERAPI DECLSPEC_IMPORT
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#else
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//#define WINBERAPI __declspec(dllexport)
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#define WINBERAPI
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#endif
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#ifndef BERAPI
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#define BERAPI __cdecl
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#endif
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#define LBER_ERROR 0xffffffffL
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#define LBER_DEFAULT 0xffffffffL
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typedef unsigned int ber_tag_t; /* for BER tags */
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typedef int ber_int_t; /* for BER ints, enums, and Booleans */
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typedef unsigned int ber_uint_t; /* unsigned equivalent of ber_int_t */
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typedef unsigned int ber_len_t; /* for BER octet strings and bit strings */
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typedef int ber_slen_t; /* signed equivalent of ber_len_t */
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//
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// This constructs a new BerElement structure containing a copy of the
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// data in the supplied berval structure.
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//
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WINBERAPI BerElement * BERAPI ber_init( BERVAL *pBerVal );
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//
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// This frees a BerElement which is returned from ber_alloc_t()
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// or ber_init(). The second argument - fbuf should always be set
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// to 1.
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//
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//
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WINBERAPI VOID BERAPI ber_free( BerElement *pBerElement, INT fbuf );
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//
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// Frees a BERVAL structure. Applications should not call
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// this API to free BERVAL structures which they themselves
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// have allocated
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//
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WINBERAPI VOID BERAPI ber_bvfree( BERVAL *pBerVal );
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//
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// Frees an array of BERVAL structures.
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//
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WINBERAPI VOID BERAPI ber_bvecfree( PBERVAL *pBerVal );
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//
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// Returns a copy of a the supplied berval structure
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//
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WINBERAPI BERVAL * BERAPI ber_bvdup( BERVAL *pBerVal );
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//
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// Constructs and returns a BerElement structure. The options field
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// contains a bitwise-or of options which are to be used when generating
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// the encoding of the BerElement
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//
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// The LBER_USE_DER options should always be specified.
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//
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WINBERAPI BerElement * BERAPI ber_alloc_t( INT options );
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//
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// This skips over the current tag and returns the tag of the next
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// element in the supplied BerElement. The lenght of this element is
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// stored in the pLen argument.
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//
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// LBER_DEFAULT is returned if there is no further data to be read
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// else the tag of the next element is returned.
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//
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// The difference between ber_skip_tag() and ber_peek_tag() is that the
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// state pointer is advanced past the first tag+lenght and is pointed to
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// the value part of the next element
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//
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WINBERAPI ULONG BERAPI ber_skip_tag( BerElement *pBerElement, ULONG *pLen );
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//
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// This returns the tag of the next element to be parsed in the
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// supplied BerElement. The length of this element is stored in the
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// pLen argument.
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//
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// LBER_DEFAULT is returned if there is no further data to be read
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// else the tag of the next element is returned.
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//
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WINBERAPI ULONG BERAPI ber_peek_tag( BerElement *pBerElement, ULONG *pLen);
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//
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// This returns the tag and length of the first element in a SET, SET OF
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// or SEQUENCE OF data value.
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//
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// LBER_DEFAULT is returned if the constructed value is empty else, the tag
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// is returned. It also returns an opaque cookie which has to be passed to
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// subsequent invocations of ber_next_element().
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//
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WINBERAPI ULONG BERAPI ber_first_element( BerElement *pBerElement, ULONG *pLen, __out CHAR **ppOpaque );
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//
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// This positions the state at the start of the next element in the
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// constructed type.
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//
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// LBER_DEFAULT is returned if the constructed value is empty else, the tag
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// is returned.
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//
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WINBERAPI ULONG BERAPI ber_next_element( BerElement *pBerElement, ULONG *pLen, __in CHAR *opaque );
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//
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// This allocates a BerVal structure whose contents are taken from the
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// supplied BerElement structure.
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//
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// The return values are 0 on success and -1 on error.
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//
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WINBERAPI INT BERAPI ber_flatten( BerElement *pBerElement, PBERVAL *pBerVal );
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/*
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The ber_printf() routine is used to encode a BER element in much the
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same way that sprintf() works. One important difference, though, is
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that state information is kept in the ber argument so that multiple
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calls can be made to ber_printf() to append to the end of the BER ele-
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ment. ber MUST be a pointer to a BerElement returned by ber_alloc_t().
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ber_printf() interprets and formats its arguments according to the for-
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mat string fmt. ber_printf() returns -1 if there is an error during
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encoding and a non-negative number if successful. As with sprintf(),
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each character in fmt refers to an argument to ber_printf().
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The format string can contain the following format characters:
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't' Tag. The next argument is a ber_tag_t specifying the tag to
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override the next element to be written to the ber. This works
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across calls. The integer tag value SHOULD contain the tag
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class, constructed bit, and tag value. For example, a tag of
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"[3]" for a constructed type is 0xA3U. All implementations MUST
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support tags that fit in a single octet (i.e., where the tag
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value is less than 32) and they MAY support larger tags.
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'b' Boolean. The next argument is an ber_int_t, containing either 0
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for FALSE or 0xff for TRUE. A boolean element is output. If
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this format character is not preceded by the 't' format modif-
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ier, the tag 0x01U is used for the element.
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'e' Enumerated. The next argument is a ber_int_t, containing the
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enumerated value in the host's byte order. An enumerated ele-
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ment is output. If this format character is not preceded by the
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't' format modifier, the tag 0x0AU is used for the element.
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'i' Integer. The next argument is a ber_int_t, containing the
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integer in the host's byte order. An integer element is output.
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If this format character is not preceded by the 't' format
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modifier, the tag 0x02U is used for the element.
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'n' Null. No argument is needed. An ASN.1 NULL element is output.
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If this format character is not preceded by the 't' format
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modifier, the tag 0x05U is used for the element.
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'o' Octet string. The next two arguments are a char *, followed by
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a ber_len_t with the length of the string. The string MAY con-
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tain null bytes and are do not have to be zero-terminated. An
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octet string element is output, in primitive form. If this for-
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mat character is not preceded by the 't' format modifier, the
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tag 0x04U is used for the element.
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's' Octet string. The next argument is a char * pointing to a
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zero-terminated string. An octet string element in primitive
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form is output, which does not include the trailing '\0' (null)
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byte. If this format character is not preceded by the 't' format
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modifier, the tag 0x04U is used for the element.
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'v' Several octet strings. The next argument is a char **, an array
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of char * pointers to zero-terminated strings. The last element
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in the array MUST be a NULL pointer. The octet strings do not
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include the trailing '\0' (null) byte. Note that a construct
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like '{v}' is used to get an actual SEQUENCE OF octet strings.
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The 't' format modifier cannot be used with this format charac-
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ter.
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'V' Several octet strings. A NULL-terminated array of struct berval
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*'s is supplied. Note that a construct like '{V}' is used to
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get an actual SEQUENCE OF octet strings. The 't' format modifier
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cannot be used with this format character.
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'{' Begin sequence. No argument is needed. If this format charac-
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ter is not preceded by the 't' format modifier, the tag 0x30U is
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used.
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'}' End sequence. No argument is needed. The 't' format modifier
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cannot be used with this format character.
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'[' Begin set. No argument is needed. If this format character is
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not preceded by the 't' format modifier, the tag 0x31U is used.
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']' End set. No argument is needed. The 't' format modifier cannot
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be used with this format character.
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*/
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WINBERAPI INT BERAPI ber_printf( BerElement *pBerElement, __in PCHAR fmt, ... );
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/*
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The ber_scanf() routine is used to decode a BER element in much the same
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way that sscanf() works. One important difference, though, is that some
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state information is kept with the ber argument so that multiple calls
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can be made to ber_scanf() to sequentially read from the BER element.
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The ber argument SHOULD be a pointer to a BerElement returned by
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ber_init(). ber_scanf interprets the bytes according to the format
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string fmt, and stores the results in its additional arguments.
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ber_scanf() returns LBER_ERROR on error, and a different value on suc-
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cess.
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The format string contains conversion specifications which are used to
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direct the interpretation of the BER element. The format string can
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contain the following characters:
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'a' Octet string. A char ** argument MUST be supplied. Memory is
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allocated, filled with the contents of the octet string, zero-
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terminated, and the pointer to the string is stored in the argu-
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ment. The returned value SHOULD be freed using ldap_memfree.
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The tag of the element MUST indicate the primitive form
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(constructed strings are not supported) but is otherwise ignored
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and discarded during the decoding. This format cannot be used
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with octet strings which could contain null bytes.
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'O' Octet string. A struct berval ** argument MUST be supplied,
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which upon return points to an allocated struct berval contain-
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ing the octet string and its length. ber_bvfree() SHOULD be
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called to free the allocated memory. The tag of the element
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MUST indicate the primitive form (constructed strings are not
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supported) but is otherwise ignored during the decoding.
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'b' Boolean. A pointer to a ber_int_t MUST be supplied. The
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ber_int_t value stored will be 0 for FALSE or nonzero for TRUE.
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The tag of the element MUST indicate the primitive form but is
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otherwise ignored during the decoding.
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'e' Enumerated. A pointer to a ber_int_t MUST be supplied. The
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enumerated value stored will be in host byte order. The tag of
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the element MUST indicate the primitive form but is otherwise
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ignored during the decoding. ber_scanf() will return an error
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if the value of the enumerated value cannot be stored in a
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ber_int_t.
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'i' Integer. A pointer to a ber_int_t MUST be supplied. The
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ber_int_t value stored will be in host byte order. The tag of
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the element MUST indicate the primitive form but is otherwise
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ignored during the decoding. ber_scanf() will return an error
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if the integer cannot be stored in a ber_int_t.
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'B' Bitstring. A char ** argument MUST be supplied which will point
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to the allocated bits, followed by a ber_len_t * argument, which
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will point to the length (in bits) of the bitstring returned.
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ldap_memfree SHOULD be called to free the bitstring. The tag of
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the element MUST indicate the primitive form (constructed bit-
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strings are not supported) but is otherwise ignored during the
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decoding.
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'n' Null. No argument is needed. The element is verified to have a
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zero-length value and is skipped. The tag is ignored.
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'v' Several octet strings. A char *** argument MUST be supplied,
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which upon return points to an allocated NULL-terminated array
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of char *'s containing the octet strings. NULL is stored if the
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sequence is empty. ldap_memfree SHOULD be called to free each
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element of the array and the array itself. The tag of the
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sequence and of the octet strings are ignored.
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'V' Several octet strings (which could contain null bytes). A
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struct berval *** MUST be supplied, which upon return points to
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a allocated NULL-terminated array of struct berval *'s contain-
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ing the octet strings and their lengths. NULL is stored if the
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sequence is empty. ber_bvecfree() can be called to free the
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allocated memory. The tag of the sequence and of the octet
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strings are ignored.
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'x' Skip element. The next element is skipped. No argument is
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needed.
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'{' Begin sequence. No argument is needed. The initial sequence
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tag and length are skipped.
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'}' End sequence. No argument is needed.
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'[' Begin set. No argument is needed. The initial set tag and
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length are skipped.
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']' End set. No argument is needed.
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*/
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WINBERAPI ULONG BERAPI ber_scanf( BerElement *pBerElement, __in PCHAR fmt, ... );
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#ifdef __cplusplus
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}
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#endif
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#endif // _WINBER_DEFINED_
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