/********************************************************************************/
/*										*/
/*	Macro and Structure Definitions for the X509 Commands and Functions.	*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
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/********************************************************************************/

//** Introduction
// This file contains the macro and structure definitions for the X509 commands and
// functions.

#ifndef _TPMASN1_H_
#define _TPMASN1_H_

//** Includes

#include "Tpm.h"
#include "OIDs.h"

//** Defined Constants
//*** ASN.1 Universal Types (Class 00b)
#define ASN1_EOC               0x00
#define ASN1_BOOLEAN           0x01
#define ASN1_INTEGER           0x02
#define ASN1_BITSTRING         0x03
#define ASN1_OCTET_STRING      0x04
#define ASN1_NULL              0x05
#define ASN1_OBJECT_IDENTIFIER 0x06
#define ASN1_OBJECT_DESCRIPTOR 0x07
#define ASN1_EXTERNAL          0x08
#define ASN1_REAL              0x09
#define ASN1_ENUMERATED        0x0A
#define ASN1_EMBEDDED          0x0B
#define ASN1_UTF8String        0x0C
#define ASN1_RELATIVE_OID      0x0D
#define ASN1_SEQUENCE          0x10  // Primitive + Constructed + 0x10
#define ASN1_SET               0x11  // Primitive + Constructed + 0x11
#define ASN1_NumericString     0x12
#define ASN1_PrintableString   0x13
#define ASN1_T61String         0x14
#define ASN1_VideoString       0x15
#define ASN1_IA5String         0x16
#define ASN1_UTCTime           0x17
#define ASN1_GeneralizeTime    0x18
#define ASN1_VisibleString     0x1A
#define ASN1_GeneralString     0x1B
#define ASN1_UniversalString   0x1C
#define ASN1_CHARACTER         STRING 0x1D
#define ASN1_BMPString         0x1E
#define ASN1_CONSTRUCTED       0x20

#define ASN1_APPLICAIION_SPECIFIC 0xA0

#define ASN1_CONSTRUCTED_SEQUENCE (ASN1_SEQUENCE + ASN1_CONSTRUCTED)

#define MAX_DEPTH 10  // maximum push depth for marshaling context.

//** Macros

//*** Unmarshaling Macros
#ifndef GOTO_ERROR_UNLESS
#  error missing GOTO_ERROR_UNLESS definition
#endif

// Checks the validity of the size making sure that there is no wrap around
#define CHECK_SIZE(context, length)					\
    GOTO_ERROR_UNLESS((((length) + (context)->offset) >= (context)->offset) \
		      && (((length) + (context)->offset) <= (context)->size))
#define NEXT_OCTET(context) ((context)->buffer[(context)->offset++])
#define PEEK_NEXT(context)  ((context)->buffer[(context)->offset])

//*** Marshaling Macros

// Marshaling works in reverse order. The offset is set to the top of the buffer and,
// as the buffer is filled, 'offset' counts down to zero. When the full thing is
// encoded it can be moved to the top of the buffer. This happens when the last
// context is closed.

#define CHECK_SPACE(context, length) GOTO_ERROR_UNLESS(context->offset > length)

//** Structures

typedef struct ASN1UnmarshalContext
{
    BYTE* buffer;  // pointer to the buffer
    INT16 size;    // size of the buffer (a negative number indicates
    // a parsing failure).
    INT16 offset;  // current offset into the buffer (a negative number
    // indicates a parsing failure). Not used
    BYTE tag;      // The last unmarshaled tag
} ASN1UnmarshalContext;

typedef struct ASN1MarshalContext
{
    BYTE* buffer;  // pointer to the start of the buffer
    INT16 offset;  // place on the top where the last entry was added
    // items are added from the bottom up.
    INT16 end;     // the end offset of the current value
    INT16 depth;   // how many pushed end values.
    INT16 ends[MAX_DEPTH];
} ASN1MarshalContext;

#endif  // _TPMASN1_H_