/* This file is part of the YAZ toolkit.
 * Copyright (C) 1995-2008 Index Data.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Index Data nor the names of its contributors
 *       may be used to endorse or promote products derived from this
 *       software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * \file marcdisp.h
 * \brief MARC conversion
 */

#ifndef MARCDISP_H
#define MARCDISP_H

#include <yaz/yconfig.h>
#include <stdio.h>
#include <yaz/wrbuf.h>

#include <yaz/nmem.h>
#include <yaz/xmltypes.h>
#include <yaz/z-opac.h>

YAZ_BEGIN_CDECL

/** \brief a yaz_marc_t handle (private content) */
typedef struct yaz_marc_t_ *yaz_marc_t;

/** \brief construct yaz_marc_t handle */
YAZ_EXPORT yaz_marc_t yaz_marc_create(void);

/** \brief destroy yaz_marc_t handle */
YAZ_EXPORT void yaz_marc_destroy(yaz_marc_t mt);

/** \brief set XML mode YAZ_MARC_LINE, YAZ_MARC_SIMPLEXML, ... */
YAZ_EXPORT void yaz_marc_xml(yaz_marc_t mt, int xmlmode);

/** \brief Output format: Line-format */
#define YAZ_MARC_LINE      0
/** \brief Output format: simplexml (no longer supported) */
#define YAZ_MARC_SIMPLEXML 1
/** \brief Output format: OAI-MARC (no longer supported) */
#define YAZ_MARC_OAIMARC   2
/** \brief Output format: MARCXML */
#define YAZ_MARC_MARCXML   3
/** \brief Output format: ISO2709 */
#define YAZ_MARC_ISO2709   4
/** \brief Output format: MarcXchange */
#define YAZ_MARC_XCHANGE   5
/** \brief Output format: check only (no marc output) */
#define YAZ_MARC_CHECK  6

/** \brief set iconv handle for character set conversion .. */
YAZ_EXPORT void yaz_marc_iconv(yaz_marc_t mt, yaz_iconv_t cd);

/** \brief supply iconv handle for character set conversion .. */
YAZ_EXPORT yaz_iconv_t yaz_marc_get_iconv(yaz_marc_t mt);

/** \brief set debug level 
    \param mt handle
    \param level level, where 0=lowest, 1 more debug, 2 even more 
*/
YAZ_EXPORT void yaz_marc_debug(yaz_marc_t mt, int level);

/** \brief decodes ISO2709 buffer using straight buffers
    \param mt marc handle
    \param buf input buffer
    \param bsize size of buffer or (-1 if "any size")
    \param result result to be stored here
    \param rsize size of result (memory "owned" by yaz_marc_mt handle)

    Decodes MARC in buf of size bsize.
    On success, result in *result with size *rsize. 
    Returns -1 on error, or size of input record (>0) if OK
*/
YAZ_EXPORT int yaz_marc_decode_buf(yaz_marc_t mt, const char *buf, int bsize,
                                   const char **result, size_t *rsize);

/** \brief decodes ISO2709/MARC buffer and stores result in WRBUF
    \param mt handle
    \param buf input buffer
    \param bsize size of buffer (-1 if "any size")
    \param wrbuf WRBUF for output

    Decodes MARC in buf of size bsize.
    On success, result in wrbuf
    Returns -1 on error, or size of input record (>0) if OK
*/
YAZ_EXPORT int yaz_marc_decode_wrbuf(yaz_marc_t mt, const char *buf,
                                     int bsize, WRBUF wrbuf);

YAZ_EXPORT void yaz_marc_subfield_str(yaz_marc_t mt, const char *s);
YAZ_EXPORT void yaz_marc_endline_str(yaz_marc_t mt, const char *s);

/** \brief modifies part of the MARC leader */
YAZ_EXPORT void yaz_marc_modify_leader(yaz_marc_t mt, size_t off,
                                       const char *str);

/** \brief like atoi(3) except that it reads exactly len characters */
YAZ_EXPORT int atoi_n(const char *buf, int len);

/** \brief like atoi_n but checks for proper formatting
    \param buf buffer to read values from
    \param size size of buffer
    \param val value of decimal number (if successful)
    \retval 0 no value found (non-digits found)
    \retval 1 value found and *val holds value
*/
YAZ_EXPORT
int atoi_n_check(const char *buf, int size, int *val);

/** \brief MARC control char: record separator (29 Dec, 1D Hex) */
#define ISO2709_RS 035
/** \brief MARC control char: field separator (30 Dec, 1E Hex) */
#define ISO2709_FS 036
/** \brief MARC control char: identifier-field separator (31 Dec, 1F Hex) */
#define ISO2709_IDFS 037

/** \brief read ISO2709/MARC record from buffer
    \param mt handle
    \param buf ISO2709 buffer of size bsize
    \param bsize size of buffer (-1 for unlimited size)

    Parses ISO2709 record from supplied buffer
    Returns > 0 for OK (same as length), -1=ERROR
*/
YAZ_EXPORT int yaz_marc_read_iso2709(yaz_marc_t mt,
                                     const char *buf, int bsize);

/** \brief read MARC lineformat from stream
    \param mt handle
    \param getbyte get one byte handler
    \param ungetbyte unget one byte handler
    \param client_data opaque data for handers

    Parses MARC line record from stream
    Returns > 0 for OK (same as length), -1=ERROR
*/
YAZ_EXPORT 
int yaz_marc_read_line(yaz_marc_t mt,
                       int (*getbyte)(void *client_data),
                       void (*ungetbyte)(int b, void *client_data),
                       void *client_data);

#if YAZ_HAVE_XML2
/** \brief parses MARCXML/MarcXchange record from xmlNode pointer 
    \param mt handle
    \param ptr is a pointer to root xml node 

    Returns 0=OK, -1=ERROR
*/
YAZ_EXPORT int yaz_marc_read_xml(yaz_marc_t mt, const xmlNode *ptr);
#endif

/** \brief writes record in line format
    \param mt handle
    \param wrbuf WRBUF for output

    Returns 0=OK, -1=ERROR
*/
YAZ_EXPORT int yaz_marc_write_line(yaz_marc_t mt, WRBUF wrbuf);

/** \brief writes record in MARCXML format
    \param mt handle
    \param wrbuf WRBUF for output

    Sets leader[9]='a' . Returns 0=OK, -1=ERROR . 
*/
YAZ_EXPORT int yaz_marc_write_marcxml(yaz_marc_t mt, WRBUF wrbuf);

/** \brief writes record in MarcXchange XML
    \param mt handle
    \param wrbuf WRBUF for output
    \param format record format (e.g. "MARC21")
    \param type record type (e.g. Bibliographic)

    Returns 0=OK, -1=ERROR
*/
YAZ_EXPORT int yaz_marc_write_marcxchange(yaz_marc_t mt, WRBUF wrbuf,
                                          const char *format,
                                          const char *type);

/** \brief writes record in ISO2709 format
    \param mt handle
    \param wrbuf WRBUF for output
    Returns 0=OK, -1=ERROR
*/
YAZ_EXPORT int yaz_marc_write_iso2709(yaz_marc_t mt, WRBUF wrbuf);

/** \brief writes record in mode - given by yaz_marc_xml mode
    \param mt handle
    \param wrbuf WRBUF for output
    This function calls yaz_marc_write_iso2709, yaz_marc_write_marcxml,
    etc.. depending on mode given by yaz_marc_xml. 
    Returns 0=OK, -1=ERROR 
*/  
YAZ_EXPORT int yaz_marc_write_mode(yaz_marc_t mt, WRBUF wrbuf);

#if YAZ_HAVE_XML2
/** \brief writes MARC record as libxml2 tree
    \param mt handle
    \param root_ptr pointer to record node
    \param ns namespace of record (such as "http://www.loc.gov/MARC21/slim")
    \param format MarcXchange format (NULL for none)
    \param type MarcXchange format (NULL for none)
    \retval 0 Creation successful and *root_ptr is "record" node
    \retval -1 ERROR
*/  
YAZ_EXPORT
int yaz_marc_write_xml(yaz_marc_t mt, xmlNode **root_ptr,
                       const char *ns, 
                       const char *format,
                       const char *type);
#endif

/** \brief sets leader spec (for modifying bytes in 24 byte leader)
    \param mt handle
    \param leader_spec
    \retval 0 OK
    \retval -1 ERROR
    
    Spec takes form pos=val,pos=val,...
    where value is either a number (decimal char value) or a
    string in 'a', e.g. 9='a'
    
*/  
YAZ_EXPORT int yaz_marc_leader_spec(yaz_marc_t mt, const char *leader_spec);


/** \brief sets leader, validates it, and returns important values
    \param mt handle
    \param leader of the 24 byte leader to be set
    \param indicator_length indicator length (returned value)
    \param identifier_length identifier length (returned value)
    \param base_address base address (returned value)
    \param length_data_entry length of data entry (returned value)
    \param length_starting length of starting 
    \param length_implementation length of implementation defined data
*/
YAZ_EXPORT
void yaz_marc_set_leader(yaz_marc_t mt, const char *leader,
                         int *indicator_length,
                         int *identifier_length,
                         int *base_address,
                         int *length_data_entry,
                         int *length_starting,
                         int *length_implementation);


/** \brief adds MARC comment string
    \param mt handle
    \param comment comment to be added)
*/  
YAZ_EXPORT
void yaz_marc_add_comment(yaz_marc_t mt, char *comment);

/** \brief adds MARC annotation - printf interface
    \param mt handle
    \param fmt printf format string
*/  
YAZ_EXPORT
void yaz_marc_cprintf(yaz_marc_t mt, const char *fmt, ...);

/** \brief adds subfield to MARC structure
    \param mt handle
    \param code_data code data buffer
    \param code_data_len length of code data
*/  
YAZ_EXPORT
void yaz_marc_add_subfield(yaz_marc_t mt,
                           const char *code_data, size_t code_data_len);


/** \brief adds controlfield to MARC structure
    \param mt handle
    \param tag (e.g. "001"
    \param data value for this tag
    \param data_len length of data
*/  
YAZ_EXPORT
void yaz_marc_add_controlfield(yaz_marc_t mt, const char *tag,
                               const char *data, size_t data_len);


#if YAZ_HAVE_XML2
/** \brief adds controlfield to MARC structure using xml Nodes
    \param mt handle
    \param ptr_tag value of tag (TEXT xmlNode)
    \param ptr_data value of data (TEXT xmlNode)
*/  
YAZ_EXPORT
void yaz_marc_add_controlfield_xml(yaz_marc_t mt, const xmlNode *ptr_tag,
                                   const xmlNode *ptr_data);
#endif

/** \brief adds datafield to MARC structure using strings
    \param mt handle
    \param tag value of tag as string
    \param indicator indicator string
    \param indicator_len length of indicator string
*/  
YAZ_EXPORT
void yaz_marc_add_datafield(yaz_marc_t mt, const char *tag,
                            const char *indicator, size_t indicator_len);

#if YAZ_HAVE_XML2
/** \brief adds datafield to MARC structure using xml Nodes
    \param mt handle
    \param ptr_tag value of tag (TEXT xmlNode)
    \param indicator indicator string
    \param indicator_len length of indicator string
*/  
YAZ_EXPORT
void yaz_marc_add_datafield_xml(yaz_marc_t mt, const xmlNode *ptr_tag,
                                const char *indicator, size_t indicator_len);
#endif

/** \brief returns memory for MARC handle
    \param mt handle
    \retval NMEM handle for MARC system
*/  
YAZ_EXPORT
NMEM yaz_marc_get_nmem(yaz_marc_t mt);

/** \brief clears memory and MARC record
    \param mt handle
*/  
YAZ_EXPORT
void yaz_marc_reset(yaz_marc_t mt);

/** \brief gets debug level for MARC system
    \param mt handle
*/  
YAZ_EXPORT
int yaz_marc_get_debug(yaz_marc_t mt);

/** \brief convert MARC format type to format type(YAZ_MARC_..)
    \param arg string
    \returns -1 if arg is not a known format; YAZ_MARC_.. otherwise (OK)
*/  
YAZ_EXPORT
int yaz_marc_decode_formatstr(const char *arg);

/** \brief enable writing of MARC XML records using Libxml2 
    \param mt handle
    \param enable 0=disable, 1=enable
*/  
YAZ_EXPORT
void yaz_marc_write_using_libxml2(yaz_marc_t mt, int enable);

/** \brief Performs "pretty" display of OPAC record to WRBUF */
YAZ_EXPORT void yaz_display_OPAC(WRBUF wrbuf, Z_OPACRecord *r, int flags);

/** \brief Performs "pretty" display of OPAC record to WRBUF using marc_t */
YAZ_EXPORT void yaz_opac_decode_wrbuf(yaz_marc_t mt, Z_OPACRecord *r, WRBUF wrbuf);


/** \brief flushes records
    \param mt handle
    \param wr WRBUF for output
    \retval 0 OK
    \retval -1 ERROR
*/  
YAZ_EXPORT int yaz_marc_write_trailer(yaz_marc_t mt, WRBUF wr);

/** \brief enables record collection output
    \param mt handle
*/  
YAZ_EXPORT void yaz_marc_enable_collection(yaz_marc_t mt);

YAZ_END_CDECL

#endif
/*
 * Local variables:
 * c-basic-offset: 4
 * indent-tabs-mode: nil
 * End:
 * vim: shiftwidth=4 tabstop=8 expandtab
 */

