path: root/lib/header.h

#ifndef H_HEADER
#define H_HEADER

/** \ingroup header
 * \file lib/header.h
 *
 * An rpm header carries all information about a package. A header is
 * a collection of data elements called tags. Each tag has a data type,
 * and includes 1 or more values.
 * 
 */

/* RPM - Copyright (C) 1995-2001 Red Hat Software */

#include <rpm/rpmio.h>
#include <rpm/rpmtypes.h>
#include <rpm/rpmtd.h>
#include <rpm/rpmutil.h>

#ifdef __cplusplus
extern "C" {
#endif

/** \ingroup header
 * Include calculation for 8 bytes of (magic, 0)?
 */
enum hMagic {
    HEADER_MAGIC_NO		= 0,
    HEADER_MAGIC_YES		= 1
};

/** \ingroup header
 * Create new (empty) header instance.
 * @return		header
 */
Header headerNew(void);

/** \ingroup header
 * Dereference a header instance.
 * @param h		header
 * @return		NULL always
 */
Header headerFree( Header h);

/** \ingroup header
 * Reference a header instance.
 * @param h		header
 * @return		new header reference
 */
Header headerLink(Header h);

/** \ingroup header
 * Dereference a header instance.
 * @param h		header
 * @return		new header reference
 */
Header headerUnlink(Header h);

/** \ingroup header
 * Sort tags in header.
 * @param h		header
 */
void headerSort(Header h);

/** \ingroup header
 * Restore tags in header to original ordering.
 * @param h		header
 */
void headerUnsort(Header h);

/** \ingroup header
 * Return size of on-disk header representation in bytes.
 * @param h		header
 * @param magicp	include size of 8 bytes for (magic, 0)?
 * @return		size of on-disk header
 */
unsigned int headerSizeof(Header h, enum hMagic magicp);

/** \ingroup header
 * Perform simple sanity and range checks on header tag(s).
 * @param il		no. of tags in header
 * @param dl		no. of bytes in header data.
 * @param pev		1st element in tag array, big-endian
 * @param iv		failing (or last) tag element, host-endian
 * @param negate	negative offset expected?
 * @return		-1 on success, otherwise failing tag element index
 */
int headerVerifyInfo(int il, int dl, const void * pev, void * iv, int negate);

/** \ingroup header
 * Convert header to on-disk representation.
 * @param h		header (with pointers)
 * @return		on-disk header blob (i.e. with offsets)
 */
void * headerUnload(Header h);

/** \ingroup header
 * Convert header to on-disk representation, and then reload.
 * This is used to insure that all header data is in one chunk.
 * @param h		header (with pointers)
 * @param tag		region tag
 * @return		on-disk header (with offsets)
 */
Header headerReload(Header h, rpmTag tag);

/** \ingroup header
 * Duplicate a header.
 * @param h		header
 * @return		new header instance
 */
Header headerCopy(Header h);

/** \ingroup header
 * Convert header to in-memory representation.
 * @param uh		on-disk header blob (i.e. with offsets)
 * @return		header
 */
Header headerLoad(void * uh);

/** \ingroup header
 * Make a copy and convert header to in-memory representation.
 * @param uh		on-disk header blob (i.e. with offsets)
 * @return		header
 */
Header headerCopyLoad(const void * uh);

/** \ingroup header
 * Read (and load) header from file handle.
 * @param fd		file handle
 * @param magicp	read (and verify) 8 bytes of (magic, 0)?
 * @return		header (or NULL on error)
 */
Header headerRead(FD_t fd, enum hMagic magicp);

/** \ingroup header
 * Write (with unload) header to file handle.
 * @param fd		file handle
 * @param h		header
 * @param magicp	prefix write with 8 bytes of (magic, 0)?
 * @return		0 on success, 1 on error
 */
int headerWrite(FD_t fd, Header h, enum hMagic magicp);

/** \ingroup header
 * Check if tag is in header.
 * @param h		header
 * @param tag		tag
 * @return		1 on success, 0 on failure
 */
int headerIsEntry(Header h, rpmTag tag);

typedef enum headerGetFlags_e {
    HEADERGET_DEFAULT	= 0,
    HEADERGET_MINMEM 	= (1 << 0), /* string pointers refer to header memory */
    HEADERGET_EXT 	= (1 << 1), /* lookup extension types too */
    HEADERGET_RAW 	= (1 << 2), /* return raw contents (no i18n lookups) */
    HEADERGET_ALLOC	= (1 << 3), /* always allocate memory for all data */
} headerGetFlags;

/** \ingroup header
 * Retrieve tag value.
 * @param h		header
 * @param tag		tag
 * @retval td		tag data container
 * @param flags		retrieval modifier flags
 * @return		1 on success, 0 on failure
 */
int headerGet(Header h, rpmTag tag, rpmtd td, headerGetFlags flags);

/** \ingroup header
 * Free data allocated when retrieved from header.
 * @param h		header
 * @param data		pointer to tag value(s)
 * @param type		type of data (or -1 to force free)
 * @return		NULL always
 */
void * headerFreeTag(Header h, rpm_data_t data, rpmTagType type);

/** \ingroup header
 * Retrieve tag value.
 * Will never return RPM_I18NSTRING_TYPE! RPM_STRING_TYPE elements with
 * RPM_I18NSTRING_TYPE equivalent entries are translated (if HEADER_I18NTABLE
 * entry is present).
 * @deprecated		Use headerGet() instead
 *
 * @param h		header
 * @param tag		tag
 * @retval *type	tag value data type (or NULL)
 * @retval *p		pointer to tag value(s) (or NULL)
 * @retval *c		number of values (or NULL)
 * @return		1 on success, 0 on failure
 */
int headerGetEntry(Header h, rpmTag tag,
			rpmTagType * type,
			rpm_data_t * p,
			rpm_count_t * c) RPM_GNUC_DEPRECATED;

/** \ingroup header
 * Retrieve tag value using header internal array.
 * Get an entry using as little extra RAM as possible to return the tag value.
 * This is only an issue for RPM_STRING_ARRAY_TYPE.
 * @deprecated		Use headerGet() instead
 *
 * @param h		header
 * @param tag		tag
 * @retval *type	tag value data type (or NULL)
 * @retval *p		pointer to tag value(s) (or NULL)
 * @retval *c		number of values (or NULL)
 * @return		1 on success, 0 on failure
 */
int headerGetEntryMinMemory(Header h, rpmTag tag,
			rpmTagType * type,
			rpm_data_t * p, 
			rpm_count_t * c) RPM_GNUC_DEPRECATED;

typedef enum headerPutFlags_e {
    HEADERPUT_DEFAULT	= 0,
    HEADERPUT_APPEND 	= (1 << 0),
} headerPutFlags;

/** \ingroup header
 * Add or append tag to header.
 *
 * @param h		header
 * @param td		tag data container
 * @param flags		flags to control operation
 * @return		1 on success, 0 on failure
 */
int headerPut(Header h, rpmtd td, headerPutFlags flags);

/** \ingroup header
 * Add tag to header.
 * Duplicate tags are okay, but only defined for iteration (with the
 * exceptions noted below). While you are allowed to add i18n string
 * arrays through this function, you probably don't mean to. See
 * headerAddI18NString() instead.
 *
 * @param h		header
 * @param tag		tag
 * @param type		tag value data type
 * @param p		pointer to tag value(s)
 * @param c		number of values
 * @return		1 on success, 0 on failure
 */
int headerAddEntry(Header h, rpmTag tag, rpmTagType type, rpm_constdata_t p, rpm_count_t c);

/** \ingroup header
 * Append element to tag array in header.
 * Appends item p to entry w/ tag and type as passed. Won't work on
 * RPM_STRING_TYPE. Any pointers into header memory returned from
 * headerGetEntryMinMemory() for this entry are invalid after this
 * call has been made!
 *
 * @param h		header
 * @param tag		tag
 * @param type		tag value data type
 * @param p		pointer to tag value(s)
 * @param c		number of values
 * @return		1 on success, 0 on failure
 */
int headerAppendEntry(Header h, rpmTag tag, rpmTagType type,
		rpm_constdata_t p, rpm_count_t c);

/** \ingroup header
 * Add or append element to tag array in header.
 * @param h		header
 * @param tag		tag
 * @param type		tag value data type
 * @param p		pointer to tag value(s)
 * @param c		number of values
 * @return		1 on success, 0 on failure
 */
int headerAddOrAppendEntry(Header h, rpmTag tag, rpmTagType type,
		rpm_constdata_t p, rpm_count_t c);

/** \ingroup header
 * Add locale specific tag to header.
 * A NULL lang is interpreted as the C locale. Here are the rules:
 * \verbatim
 *	- If the tag isn't in the header, it's added with the passed string
 *	   as new value.
 *	- If the tag occurs multiple times in entry, which tag is affected
 *	   by the operation is undefined.
 *	- If the tag is in the header w/ this language, the entry is
 *	   *replaced* (like headerModifyEntry()).
 * \endverbatim
 * This function is intended to just "do the right thing". If you need
 * more fine grained control use headerAddEntry() and headerModifyEntry().
 *
 * @param h		header
 * @param tag		tag
 * @param string	tag value
 * @param lang		locale
 * @return		1 on success, 0 on failure
 */
int headerAddI18NString(Header h, rpmTag tag, const char * string,
		const char * lang);

/** \ingroup header
 * Modify tag in header.
 * If there are multiple entries with this tag, the first one gets replaced.
 * @param h		header
 * @param td		tag data container
 * @return		1 on success, 0 on failure
 */
int headerMod(Header h, rpmtd td);

/** \ingroup header
 * Modify tag in header.
 * If there are multiple entries with this tag, the first one gets replaced.
 * @deprecated		Use headerMod() instead
 *
 * @param h		header
 * @param tag		tag
 * @param type		tag value data type
 * @param p		pointer to tag value(s)
 * @param c		number of values
 * @return		1 on success, 0 on failure
 */
int headerModifyEntry(Header h, rpmTag tag, rpmTagType type,
			rpm_constdata_t p, rpm_count_t c) RPM_GNUC_DEPRECATED;

/** \ingroup header
 * Delete tag in header.
 * Removes all entries of type tag from the header, returns 1 if none were
 * found.
 *
 * @param h		header
 * @param tag		tag
 * @return		0 on success, 1 on failure (INCONSISTENT)
 */
int headerDel(Header h, rpmTag tag);

/** \ingroup header
 * Delete tag in header.
 * Removes all entries of type tag from the header, returns 1 if none were
 * found.
 * @deprecated		Use headerDel() instead
 *
 * @param h		header
 * @param tag		tag
 * @return		0 on success, 1 on failure (INCONSISTENT)
 */
int headerRemoveEntry(Header h, rpmTag tag) RPM_GNUC_DEPRECATED;

/** \ingroup header
 * Return formatted output string from header tags.
 * The returned string must be free()d.
 *
 * @param h		header
 * @param fmt		format to use
 * @retval errmsg	error message (if any)
 * @return		formatted output string (malloc'ed)
 */
char * headerFormat(Header h, const char * fmt, errmsg_t * errmsg);

/** \ingroup header
 * Return formatted output string from header tags.
 * The returned string must be free()d.
 *
 * @param h		header
 * @param fmt		format to use
 * @param tbltags	array of tag name/value pairs (unused)
 * @param extensions	chained table of formatting extensions. (unused)
 * @retval errmsg	error message (if any)
 * @return		formatted output string (malloc'ed)
 */
char * headerSprintf(Header h, const char * fmt,
		     void * tbltags, void * extensions,
		     errmsg_t * errmsg) RPM_GNUC_DEPRECATED;

/** \ingroup header
 * Duplicate tag values from one header into another.
 * @param headerFrom	source header
 * @param headerTo	destination header
 * @param tagstocopy	array of tags that are copied
 */
void headerCopyTags(Header headerFrom, Header headerTo, 
		    const rpmTag * tagstocopy);

/** \ingroup header
 * Destroy header tag iterator.
 * @param hi		header tag iterator
 * @return		NULL always
 */
HeaderIterator headerFreeIterator(HeaderIterator hi);

/** \ingroup header
 * Create header tag iterator.
 * @param h		header
 * @return		header tag iterator
 */
HeaderIterator headerInitIterator(Header h);

/** \ingroup header
 * Return next tag from header.
 * @param hi		header tag iterator
 * @retval td		tag data container
 * @return		1 on success, 0 on failure
 */
int headerNext(HeaderIterator hi, rpmtd td);

/** \ingroup header
 * Return next tag from header.
 * @deprecated Use headerNext() instead.
 *
 * @param hi		header tag iterator
 * @retval *tag		tag
 * @retval *type	tag value data type
 * @retval *p		pointer to tag value(s)
 * @retval *c		number of values
 * @return		1 on success, 0 on failure
 */
int headerNextIterator(HeaderIterator hi,
		rpmTag * tag,
		rpmTagType * type,
		rpm_data_t * p,
		rpm_count_t * c) RPM_GNUC_DEPRECATED;



/** \ingroup header
 * Free data allocated when retrieved from header.
 * @deprecated Use headerFreeTag() instead.
 * @todo Remove from API.
 *
 * @param data		address of data (or NULL)
 * @param type		type of data (or RPM_FORCEFREE_TYPE to force free)
 * @return		NULL always
 */
void * headerFreeData(rpm_data_t data, rpmTagType type);

/** \ingroup header
 * Return name, version, release strings from header.
 * @param h		header
 * @retval *np		name pointer (or NULL)
 * @retval *vp		version pointer (or NULL)
 * @retval *rp		release pointer (or NULL)
 * @return		0 always
 */
int headerNVR(Header h,
		const char ** np,
		const char ** vp,
		const char ** rp);

/** \ingroup header
 * Return name, epoch, version, release, arch strings from header.
 * @param h		header
 * @retval *np		name pointer (or NULL)
 * @retval *ep		epoch pointer (or NULL)
 * @retval *vp		version pointer (or NULL)
 * @retval *rp		release pointer (or NULL)
 * @retval *ap		arch pointer (or NULL)
 * @return		0 always
 */
int headerNEVRA(Header h,
		const char ** np,
		uint32_t ** ep,
		const char ** vp,
		const char ** rp,
		const char ** ap);

/** \ingroup header
 * Return (malloc'd) header name-version-release string.
 * @param h		header
 * @retval np		name tag value
 * @return		name-version-release string
 */
char * headerGetNEVR(Header h, const char ** np );

/** \ingroup header
 * Return (malloc'd) header name-version-release.arch string.
 * @param h		header
 * @retval np		name tag value
 * @return		name-version-release string
 */
char * headerGetNEVRA(Header h, const char ** np );

/* \ingroup header
 * Return (malloc'd) header (epoch:)version-release string.
 * @param h		header
 * @retval np		name tag value (or NULL)
 * @return             (epoch:)version-release string
 */
char * headerGetEVR(Header h, const char **np);

/** \ingroup header
 * Return header color.
 * @param h		header
 * @return		header color
 */
rpm_color_t headerGetColor(Header h);

/** \ingroup header
 * Check if header is a source or binary package header
 * @param h		header
 * @return		0 == binary, 1 == source
 */
int headerIsSource(Header h);

/* ==================================================================== */
/** \name RPMTS */
/**
 * Prototype for headerFreeData() vector.
 *
 * @param data		address of data (or NULL)
 * @param type		type of data (or  to force free)
 * @return		NULL always
 */
typedef
    void * (*HFD_t) (rpm_data_t data, rpmTagType type);

/**
 * Prototype for headerGetEntry() vector.
 *
 * Will never return RPM_I18NSTRING_TYPE! RPM_STRING_TYPE elements with
 * RPM_I18NSTRING_TYPE equivalent entries are translated (if HEADER_I18NTABLE
 * entry is present).
 *
 * @param h		header
 * @param tag		tag
 * @retval type		address of tag value data type (or NULL)
 * @retval p		address of pointer to tag value(s) (or NULL)
 * @retval c		address of number of values (or NULL)
 * @return		1 on success, 0 on failure
 */
typedef int (*HGE_t) (Header h, rpmTag tag,
			rpmTagType * type,
			rpm_data_t * p,
			rpm_count_t * c);

/**
 * Prototype for headerAddEntry() vector.
 *
 * Duplicate tags are okay, but only defined for iteration (with the
 * exceptions noted below). While you are allowed to add i18n string
 * arrays through this function, you probably don't mean to. See
 * headerAddI18NString() instead.
 *
 * @param h             header
 * @param tag           tag
 * @param type          tag value data type
 * @param p             pointer to tag value(s)
 * @param c             number of values
 * @return              1 on success, 0 on failure
 */
typedef int (*HAE_t) (Header h, rpmTag tag, rpmTagType type,
			rpm_constdata_t p, rpm_count_t c);

/**
 * Prototype for headerModifyEntry() vector.
 * If there are multiple entries with this tag, the first one gets replaced.
 *
 * @param h		header
 * @param tag		tag
 * @param type		tag value data type
 * @param p		pointer to tag value(s)
 * @param c		number of values
 * @return		1 on success, 0 on failure
 */
typedef int (*HME_t) (Header h, rpmTag tag, rpmTagType type,
			rpm_constdata_t p, rpm_count_t c);

/**
 * Prototype for headerRemoveEntry() vector.
 * Delete tag in header.
 * Removes all entries of type tag from the header, returns 1 if none were
 * found.
 *
 * @param h		header
 * @param tag		tag
 * @return		0 on success, 1 on failure (INCONSISTENT)
 */
typedef int (*HRE_t) (Header h, rpmTag tag);

#ifdef __cplusplus
}
#endif

#endif	/* H_HEADER */