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/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_util.h
* @brief Interface for common utility functions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#ifndef UTIL_H_
#define UTIL_H_
#include <gnunet/gnunet_util_lib.h>
#include <gcrypt.h>
/* Define logging functions */
#define LOG_DEBUG(...) \
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
#define LOG_WARNING(...) \
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, __VA_ARGS__)
#define LOG_ERROR(...) \
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, __VA_ARGS__)
/**
* Tests a given as assertion and if failed prints it as a warning with the
* given reason
*
* @param EXP the expression to test as assertion
* @param reason string to print as warning
*/
#define TALER_assert_as(EXP, reason) \
do { \
if (EXP) break; \
LOG_ERROR("%s at %s:%d\n", reason, __FILE__, __LINE__); \
abort(); \
} while(0)
/**
* Log an error message at log-level 'level' that indicates
* a failure of the command 'cmd' with the message given
* by gcry_strerror(rc).
*/
#define LOG_GCRY_ERROR(cmd, rc) do { LOG_ERROR("`%s' failed at %s:%d with error: %s\n", cmd, __FILE__, __LINE__, gcry_strerror(rc)); } while(0)
#define TALER_gcry_ok(cmd) \
do {int rc; rc = cmd; if (!rc) break; LOG_ERROR("A Gcrypt call failed at %s:%d with error: %s\n", __FILE__, __LINE__, gcry_strerror(rc)); abort(); } while (0)
#define TALER_CURRENCY_LEN 4
GNUNET_NETWORK_STRUCT_BEGIN
struct TALER_AmountNBO
{
uint32_t value;
uint32_t fraction;
char currency[TALER_CURRENCY_LEN];
};
GNUNET_NETWORK_STRUCT_END
/**
* Representation of monetary value in a given currency.
*/
struct TALER_Amount
{
/**
* Value (numerator of fraction)
*/
uint32_t value;
/**
* Fraction (denominator of fraction)
*/
uint32_t fraction;
/**
* Currency string, left adjusted and padded with zeros.
*/
char currency[4];
};
/**
* Initialize Gcrypt library.
*/
void
TALER_gcrypt_init (void);
/**
* Parse denomination description, in the format "T : V : F".
*
* @param str denomination description
* @param denom denomination to write the result to
* @return GNUNET_OK if the string is a valid denomination specification,
* GNUNET_SYSERR if it is invalid.
*/
int
TALER_string_to_amount (const char *str, struct TALER_Amount *denom);
/**
* FIXME
*/
struct TALER_AmountNBO
TALER_amount_hton (struct TALER_Amount d);
/**
* FIXME
*/
struct TALER_Amount
TALER_amount_ntoh (struct TALER_AmountNBO dn);
/**
* Compare the value/fraction of two amounts. Does not compare the currency,
* i.e. comparing amounts with the same value and fraction but different
* currency would return 0.
*
* @param a1 first amount
* @param a2 second amount
* @return result of the comparison
*/
int
TALER_amount_cmp (struct TALER_Amount a1, struct TALER_Amount a2);
/**
* Perform saturating subtraction of amounts.
*
* @param a1 amount to subtract from
* @param a2 amount to subtract
* @return (a1-a2) or 0 if a2>=a1
*/
struct TALER_Amount
TALER_amount_subtract (struct TALER_Amount a1, struct TALER_Amount a2);
/**
* Perform saturating addition of amounts
*
* @param a1 first amount to add
* @param a2 second amount to add
* @return sum of a1 and a2
*/
struct TALER_Amount
TALER_amount_add (struct TALER_Amount a1, struct TALER_Amount a2);
/**
* Normalize the given amount.
*
* @param amout amount to normalize
* @return normalized amount
*/
struct TALER_Amount
TALER_amount_normalize (struct TALER_Amount amount);
/**
* Convert amount to string.
*
* @param amount amount to convert to string
* @return freshly allocated string representation
*/
char *
TALER_amount_to_string (struct TALER_Amount amount);
/**
* Return the base32crockford encoding of the given buffer.
*
* The returned string will be freshly allocated, and must be free'd
* with GNUNET_free.
*
* @param buffer with data
* @param size size of the buffer
* @return freshly allocated, null-terminated string
*/
char *
TALER_data_to_string_alloc (const void *buf, size_t size);
/**
* Get encoded binary data from a configuration.
*
* @return GNUNET_OK on success
* GNUNET_NO is the value does not exist
* GNUNET_SYSERR on encoding error
*/
int
TALER_configuration_get_data (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section, const char *option,
void *buf, size_t buf_size);
int
TALER_refresh_decrypt (const void *input, size_t input_size, const struct GNUNET_HashCode *secret, void *result);
int
TALER_refresh_encrypt (const void *input, size_t input_size, const struct GNUNET_HashCode *secret, void *result);
#endif
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