/*
 * rpmopen.c : open an extract informations from RPM files.
 *
 * $Id: rpmopen.c,v 1.1 1997/11/11 07:12:32 veillard Exp $
 *
 * $Log: rpmopen.c,v $
 * Revision 1.1  1997/11/11 07:12:32  veillard
 * Initial revision
 *
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <rpm/rpmlib.h>

#include "rpmdata.h"

/*
 * Get the internal number associated to an RPM tag.
 */
static int getTagNumber(char *tag) {
    int i;
    const struct headerTagTableEntry * t;

    for (i = 0, t = rpmTagTable; i < rpmTagTableSize; i++, t++) {
	if (!strcasecmp(tag, t->name)) return(t->val);
    }
    fprintf(stderr, "getTagNumber(%s) : unknown tag !\n", tag);
    return(-1);
}

/*
 * rpmOpen : open an RPM file, read and parse the header and 
 *           fill the informations in the database.
 */
int rpmOpen(char *nameRpm) {
    int fd;
    int rc;
    Header h = NULL;
    int isSource;
    char * name, * version, * release;
    int_32 count, type;
    void * p;
    int val, i;
    rpmDataPtr rpm = NULL;
    static char buffer[80000];

    /* open the file for reading */
    if ((fd = open(nameRpm, O_RDONLY)) < 0) {
         fprintf(stderr, "open of %s failed: %s\n", nameRpm,
	         strerror(errno));
	 goto error;
    }

    /* read the RPM header */
    rc = rpmReadPackageHeader(fd, &h, &isSource, NULL, NULL);
    switch (rc) {
	case 0:
	    if (!h) {
		fprintf(stderr,
			"old format source packages cannot be queried\n");
		goto error;
	    }
	    break;
	case 1:
	    fprintf(stderr, "%s does not appear to be a RPM package\n",
		    nameRpm);
	    goto error;
	case 2:
	    fprintf(stderr, "query of %s failed\n", nameRpm);
	    goto error;
	default:
	    fprintf(stderr, "rpmReadPackageHeader(%s): unknown error %d\n",
		    nameRpm, rc);
	    goto error;
    }

    /* extract informations from the header */
    headerGetEntry(h, RPMTAG_NAME, &type, (void **) &name, &count);
    headerGetEntry(h, RPMTAG_VERSION, &type, (void **) &version, &count);
    headerGetEntry(h, RPMTAG_RELEASE, &type, (void **) &release, &count);
        
    /* allocate a new rpmData block, fill it */
    rpm = (rpmDataPtr) malloc(sizeof(rpmData));
    if (rpm == NULL) {
         fprintf(stderr, "cannot allocate %d bytes: %s\n", sizeof(rpmData),
	         strerror(errno));
         goto error;
    }
    rpm->name = strdup(name);
    rpm->version = strdup(version);
    rpm->release = strdup(release);

    /* get all the ressources provided by this RPM */
    val = getTagNumber("RPMTAG_PROVIDES");
    if (!headerGetEntry(h, val, &type, &p, &count) || !p) {
        rpm->nb_ressources = 0;
    } else {
	if (count >= MAX_RESS) {
	    fprintf(stderr, "MAX_RESS %d overflow, increase the limit!\n",
		    MAX_RESS);
	    count = MAX_RESS;
	}

	rpm->nb_ressources = count;
        for (i = 0; i < count;i++) {
	    rpm->ressources[i] = rpmRessAdd(((char **) p)[i], rpm);
	}
    }

    /* insert the package informations in the database */
    rpm->next = rpmList;
    rpmList = rpm;

    /* free the header and close the descriptor */
    headerFree(h);
    close(fd);
    return(0);

error:
    if (rpm != NULL) free(rpm);
    if (h != NULL) headerFree(h);
    if (fd >= 0) close(fd);
    return(-1);
}

int main(int argc, char *argv[]) {
    int i;

    if (argc < 2) {
        fprintf(stderr, "usage : %s rpm1 rpm2 ...\n", argv[0]);
	exit(0);
    }
    for (i = 1; i < argc ; i++) {
        rpmOpen(argv[i]);
    }
    rpmDataPrintAll();

    return(0);
}