path: root/camel/camel-store-summary.c

/*
 * Copyright (C) 2001 Ximian Inc.
 *
 * Authors: Michael Zucchi <notzed@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program 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 this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include "camel-store-summary.h"

#include "camel-file-utils.h"

#include "hash-table-utils.h"
#include "e-util/md5-utils.h"
#include "e-util/e-memory.h"

#include "camel-private.h"
#include "camel-url.h"

#define d(x)
#define io(x)           /* io debug */

/* possible versions, for versioning changes */
#define CAMEL_STORE_SUMMARY_VERSION_0 (1)

/* current version */
#define CAMEL_STORE_SUMMARY_VERSION (1)

#define _PRIVATE(o) (((CamelStoreSummary *)(o))->priv)

static int summary_header_load(CamelStoreSummary *, FILE *);
static int summary_header_save(CamelStoreSummary *, FILE *);

static CamelStoreInfo * store_info_new(CamelStoreSummary *, const char *);
static CamelStoreInfo * store_info_load(CamelStoreSummary *, FILE *);
static int       store_info_save(CamelStoreSummary *, FILE *, CamelStoreInfo *);
static void      store_info_free(CamelStoreSummary *, CamelStoreInfo *);

static const char *store_info_string(CamelStoreSummary *, const CamelStoreInfo *, int);
static void store_info_set_string(CamelStoreSummary *, CamelStoreInfo *, int, const char *);

static void camel_store_summary_class_init (CamelStoreSummaryClass *klass);
static void camel_store_summary_init       (CamelStoreSummary *obj);
static void camel_store_summary_finalise   (CamelObject *obj);

static CamelObjectClass *camel_store_summary_parent;

static void
camel_store_summary_class_init (CamelStoreSummaryClass *klass)
{
    camel_store_summary_parent = camel_type_get_global_classfuncs (camel_object_get_type ());

    klass->summary_header_load = summary_header_load;
    klass->summary_header_save = summary_header_save;

    klass->store_info_new  = store_info_new;
    klass->store_info_load = store_info_load;
    klass->store_info_save = store_info_save;
    klass->store_info_free = store_info_free;

    klass->store_info_string = store_info_string;
    klass->store_info_set_string = store_info_set_string;
}

static void
camel_store_summary_init (CamelStoreSummary *s)
{
    struct _CamelStoreSummaryPrivate *p;

    p = _PRIVATE(s) = g_malloc0(sizeof(*p));

    s->store_info_size = sizeof(CamelStoreInfo);

    s->store_info_chunks = NULL;

    s->version = CAMEL_STORE_SUMMARY_VERSION;
    s->flags = 0;
    s->count = 0;
    s->time = 0;

    s->folders = g_ptr_array_new();
    s->folders_path = g_hash_table_new(g_str_hash, g_str_equal);

#ifdef ENABLE_THREADS
    p->summary_lock = g_mutex_new();
    p->io_lock = g_mutex_new();
    p->alloc_lock = g_mutex_new();
    p->ref_lock = g_mutex_new();
#endif
}

static void
camel_store_summary_finalise (CamelObject *obj)
{
    struct _CamelStoreSummaryPrivate *p;
    CamelStoreSummary *s = (CamelStoreSummary *)obj;

    p = _PRIVATE(obj);

    camel_store_summary_clear(s);
    g_ptr_array_free(s->folders, TRUE);
    g_hash_table_destroy(s->folders_path);

    g_free(s->summary_path);

    if (s->store_info_chunks)
        e_memchunk_destroy(s->store_info_chunks);

#ifdef ENABLE_THREADS
    g_mutex_free(p->summary_lock);
    g_mutex_free(p->io_lock);
    g_mutex_free(p->alloc_lock);
    g_mutex_free(p->ref_lock);
#endif

    g_free(p);
}

CamelType
camel_store_summary_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_object_get_type (), "CamelStoreSummary",
                        sizeof (CamelStoreSummary),
                        sizeof (CamelStoreSummaryClass),
                        (CamelObjectClassInitFunc) camel_store_summary_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_store_summary_init,
                        (CamelObjectFinalizeFunc) camel_store_summary_finalise);
    }
    
    return type;
}

/**
 * camel_store_summary_new:
 *
 * Create a new CamelStoreSummary object.
 * 
 * Return value: A new CamelStoreSummary widget.
 **/
CamelStoreSummary *
camel_store_summary_new (void)
{
    CamelStoreSummary *new = CAMEL_STORE_SUMMARY ( camel_object_new (camel_store_summary_get_type ())); return new;
}

/**
 * camel_store_summary_set_filename:
 * @s: 
 * @name: 
 * 
 * Set the filename where the summary will be loaded to/saved from.
 **/
void camel_store_summary_set_filename(CamelStoreSummary *s, const char *name)
{
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    g_free(s->summary_path);
    s->summary_path = g_strdup(name);

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
}

void camel_store_summary_set_uri_base(CamelStoreSummary *s, CamelURL *base)
{
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    if (s->uri_base)
        camel_url_free(s->uri_base);
    s->uri_base = camel_url_new_with_base(base, "");

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
}

/**
 * camel_store_summary_count:
 * @s: 
 * 
 * Get the number of summary items stored in this summary.
 * 
 * Return value: The number of items int he summary.
 **/
int
camel_store_summary_count(CamelStoreSummary *s)
{
    return s->folders->len;
}

/**
 * camel_store_summary_index:
 * @s: 
 * @i: 
 * 
 * Retrieve a summary item by index number.
 *
 * A referenced to the summary item is returned, which may be
 * ref'd or free'd as appropriate.
 * 
 * Return value: The summary item, or NULL if the index @i is out
 * of range.
 * It must be freed using camel_store_summary_info_free().
 **/
CamelStoreInfo *
camel_store_summary_index(CamelStoreSummary *s, int i)
{
    CamelStoreInfo *info = NULL;

    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    if (i<s->folders->len)
        info = g_ptr_array_index(s->folders, i);

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);

    if (info)
        info->refcount++;

    CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);

    return info;
}

/**
 * camel_store_summary_index:
 * @s: 
 * @i: 
 * 
 * Obtain a copy of the summary array.  This is done atomically,
 * so cannot contain empty entries.
 *
 * It must be freed using camel_store_summary_array_free().
 **/
GPtrArray *
camel_store_summary_array(CamelStoreSummary *s)
{
    CamelStoreInfo *info;
    GPtrArray *res = g_ptr_array_new();
    int i;
    
    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    g_ptr_array_set_size(res, s->folders->len);
    for (i=0;i<s->folders->len;i++) {
        info = res->pdata[i] = g_ptr_array_index(s->folders, i);
        info->refcount++;
    }

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
    CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);

    return res;
}

/**
 * camel_store_summary_array_free:
 * @s: 
 * @array: 
 * 
 * Free the folder summary array.
 **/
void
camel_store_summary_array_free(CamelStoreSummary *s, GPtrArray *array)
{
    int i;

    for (i=0;i<array->len;i++)
        camel_store_summary_info_free(s, array->pdata[i]);

    g_ptr_array_free(array, TRUE);
}

/**
 * camel_store_summary_path:
 * @s: 
 * @path: 
 * 
 * Retrieve a summary item by path name.
 *
 * A referenced to the summary item is returned, which may be
 * ref'd or free'd as appropriate.
 * 
 * Return value: The summary item, or NULL if the @path name
 * is not available.
 * It must be freed using camel_store_summary_info_free().
 **/
CamelStoreInfo *
camel_store_summary_path(CamelStoreSummary *s, const char *path)
{
    CamelStoreInfo *info;

    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    info = g_hash_table_lookup(s->folders_path, path);

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);

    if (info)
        info->refcount++;

    CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);

    return info;
}

int
camel_store_summary_load(CamelStoreSummary *s)
{
    FILE *in;
    int i;
    CamelStoreInfo *mi;

    g_assert(s->summary_path);

    in = fopen(s->summary_path, "r");
    if (in == NULL)
        return -1;

    CAMEL_STORE_SUMMARY_LOCK(s, io_lock);
    if ( ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->summary_header_load(s, in) == -1)
        goto error;

    /* now read in each message ... */
    for (i=0;i<s->count;i++) {
        mi = ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->store_info_load(s, in);

        if (mi == NULL)
            goto error;

        camel_store_summary_add(s, mi);
    }

    CAMEL_STORE_SUMMARY_UNLOCK(s, io_lock);
    
    if (fclose (in) != 0)
        return -1;

    s->flags &= ~CAMEL_STORE_SUMMARY_DIRTY;

    return 0;

error:
    i = ferror (in);
    g_warning("Cannot load summary file: %s", strerror(ferror(in)));
    CAMEL_STORE_SUMMARY_UNLOCK(s, io_lock);
    fclose(in);
    s->flags |= ~CAMEL_STORE_SUMMARY_DIRTY;
    errno = i;
    
    return -1;
}

/**
 * camel_store_summary_save:
 * @s: 
 * 
 * Writes the summary to disk.  The summary is only written if changes
 * have occured.
 * 
 * Return value: Returns -1 on error.
 **/
int
camel_store_summary_save(CamelStoreSummary *s)
{
    FILE *out;
    int fd;
    int i;
    guint32 count;
    CamelStoreInfo *mi;

    g_assert(s->summary_path);

    io(printf("** saving summary\n"));

    if ((s->flags & CAMEL_STORE_SUMMARY_DIRTY) == 0) {
        io(printf("**  summary clean no save\n"));
        return 0;
    }

    fd = open(s->summary_path, O_RDWR|O_CREAT|O_TRUNC, 0600);
    if (fd == -1) {
        io(printf("**  open error: %s\n", strerror(errno)));
        return -1;
    }
    out = fdopen(fd, "w");
    if ( out == NULL ) {
        i = errno;
        printf("**  fdopen error: %s\n", strerror(errno));
        close(fd);
        errno = i;
        return -1;
    }

    io(printf("saving header\n"));

    CAMEL_STORE_SUMMARY_LOCK(s, io_lock);

    if ( ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->summary_header_save(s, out) == -1) {
        i = errno;
        fclose(out);
        CAMEL_STORE_SUMMARY_UNLOCK(s, io_lock);
        errno = i;
        return -1;
    }

    /* now write out each message ... */

    /* FIXME: Locking? */

    count = s->folders->len;
    for (i=0;i<count;i++) {
        mi = s->folders->pdata[i];
        ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->store_info_save(s, out, mi);
    }

    CAMEL_STORE_SUMMARY_UNLOCK(s, io_lock);
    
    if (fflush (out) != 0 || fsync (fileno (out)) == -1) {
        i = errno;
        fclose (out);
        errno = i;
        return -1;
    }
    
    if (fclose (out) != 0)
        return -1;

    s->flags &= ~CAMEL_STORE_SUMMARY_DIRTY;
    return 0;
}

/**
 * camel_store_summary_header_load:
 * @s: Summary object.
 * 
 * Only load the header information from the summary,
 * keep the rest on disk.  This should only be done on
 * a fresh summary object.
 * 
 * Return value: -1 on error.
 **/
int camel_store_summary_header_load(CamelStoreSummary *s)
{
    FILE *in;
    int ret;

    g_assert(s->summary_path);

    in = fopen(s->summary_path, "r");
    if (in == NULL)
        return -1;

    CAMEL_STORE_SUMMARY_LOCK(s, io_lock);
    ret = ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->summary_header_load(s, in);
    CAMEL_STORE_SUMMARY_UNLOCK(s, io_lock);
    
    fclose(in);
    s->flags &= ~CAMEL_STORE_SUMMARY_DIRTY;
    return ret;
}

/**
 * camel_store_summary_add:
 * @s: 
 * @info: 
 * 
 * Adds a new @info record to the summary.  If @info->uid is NULL, then a new
 * uid is automatically re-assigned by calling :next_uid_string().
 *
 * The @info record should have been generated by calling one of the
 * info_new_*() functions, as it will be free'd based on the summary
 * class.  And MUST NOT be allocated directly using malloc.
 **/
void camel_store_summary_add(CamelStoreSummary *s, CamelStoreInfo *info)
{
    if (info == NULL)
        return;

    if (camel_store_info_path(s, info) == NULL) {
        g_warning("Trying to add a folder info with missing required path name\n");
        return;
    }

    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    g_ptr_array_add(s->folders, info);
    g_hash_table_insert(s->folders_path, (char *)camel_store_info_path(s, info), info);
    s->flags |= CAMEL_STORE_SUMMARY_DIRTY;

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
}

/**
 * camel_store_summary_add_from_path:
 * @s: 
 * @h: 
 * 
 * Build a new info record based on the name, and add it to the summary.
 *
 * Return value: The newly added record.
 **/
CamelStoreInfo *camel_store_summary_add_from_path(CamelStoreSummary *s, const char *path)
{
    CamelStoreInfo *info;

    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);

    info = g_hash_table_lookup(s->folders_path, path);
    if (info != NULL) {
        g_warning("Trying to add folder '%s' to summary that already has it", path);
        info = NULL;
    } else {
        info = camel_store_summary_info_new_from_path(s, path);
        g_ptr_array_add(s->folders, info);
        g_hash_table_insert(s->folders_path, (char *)camel_store_info_path(s, info), info);
        s->flags |= CAMEL_STORE_SUMMARY_DIRTY;
    }

    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);

    return info;
}

/**
 * camel_store_summary_info_new_from_path:
 * @s: 
 * @h: 
 * 
 * Create a new info record from a name.
 * 
 * Return value: Guess?  This info record MUST be freed using
 * camel_store_summary_info_free(), camel_store_info_free() will not work.
 **/
CamelStoreInfo *camel_store_summary_info_new_from_path(CamelStoreSummary *s, const char *f)
{
    return ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s))) -> store_info_new(s, f);
}

/**
 * camel_store_summary_info_free:
 * @s: 
 * @mi: 
 * 
 * Unref and potentially free the message info @mi, and all associated memory.
 **/
void camel_store_summary_info_free(CamelStoreSummary *s, CamelStoreInfo *mi)
{
    g_assert(mi);
    g_assert(s);

    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);

    g_assert(mi->refcount >= 1);

    mi->refcount--;
    if (mi->refcount > 0) {
        CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);
        return;
    }

    CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);

    ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->store_info_free(s, mi);        
}

/**
 * camel_store_summary_info_ref:
 * @s: 
 * @mi: 
 * 
 * Add an extra reference to @mi.
 **/
void camel_store_summary_info_ref(CamelStoreSummary *s, CamelStoreInfo *mi)
{
    g_assert(mi);
    g_assert(s);

    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);
    g_assert(mi->refcount >= 1);
    mi->refcount++;
    CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);
}

/**
 * camel_store_summary_touch:
 * @s: 
 * 
 * Mark the summary as changed, so that a save will save it.
 **/
void
camel_store_summary_touch(CamelStoreSummary *s)
{
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
    s->flags |= CAMEL_STORE_SUMMARY_DIRTY;
    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
}

/**
 * camel_store_summary_clear:
 * @s: 
 * 
 * Empty the summary contents.
 **/
void
camel_store_summary_clear(CamelStoreSummary *s)
{
    int i;

    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
    if (camel_store_summary_count(s) == 0) {
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        return;
    }

    for (i=0;i<s->folders->len;i++)
        camel_store_summary_info_free(s, s->folders->pdata[i]);

    g_ptr_array_set_size(s->folders, 0);
    g_hash_table_destroy(s->folders_path);
    s->folders_path = g_hash_table_new(g_str_hash, g_str_equal);
    s->flags |= CAMEL_STORE_SUMMARY_DIRTY;
    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
}

/**
 * camel_store_summary_remove:
 * @s: 
 * @info: 
 * 
 * Remove a specific @info record from the summary.
 **/
void camel_store_summary_remove(CamelStoreSummary *s, CamelStoreInfo *info)
{
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
    g_hash_table_remove(s->folders_path, camel_store_info_path(s, info));
    g_ptr_array_remove(s->folders, info);
    s->flags |= CAMEL_STORE_SUMMARY_DIRTY;
    CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);

    camel_store_summary_info_free(s, info);
}

/**
 * camel_store_summary_remove_uid:
 * @s: 
 * @path: 
 * 
 * Remove a specific info record from the summary, by @path.
 **/
void camel_store_summary_remove_path(CamelStoreSummary *s, const char *path)
{
        CamelStoreInfo *oldinfo;
        char *oldpath;

    CAMEL_STORE_SUMMARY_LOCK(s, ref_lock);
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
        if (g_hash_table_lookup_extended(s->folders_path, path, (void *)&oldpath, (void *)&oldinfo)) {
        /* make sure it doesn't vanish while we're removing it */
        oldinfo->refcount++;
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);
        camel_store_summary_remove(s, oldinfo);
        camel_store_summary_info_free(s, oldinfo);
        } else {
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        CAMEL_STORE_SUMMARY_UNLOCK(s, ref_lock);
    }
}

/**
 * camel_store_summary_remove_index:
 * @s: 
 * @index: 
 * 
 * Remove a specific info record from the summary, by index.
 **/
void camel_store_summary_remove_index(CamelStoreSummary *s, int index)
{
    CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
    if (index < s->folders->len) {
        CamelStoreInfo *info = s->folders->pdata[index];

        g_hash_table_remove(s->folders_path, camel_store_info_path(s, info));
        g_ptr_array_remove_index(s->folders, index);
        s->flags |= CAMEL_STORE_SUMMARY_DIRTY;

        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        camel_store_summary_info_free(s, info);
    } else {
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
    }
}

static int
summary_header_load(CamelStoreSummary *s, FILE *in)
{
    gint32 version, flags, count;
    time_t time;

    fseek(in, 0, SEEK_SET);

    io(printf("Loading header\n"));

    if (camel_file_util_decode_fixed_int32(in, &version) == -1
        || camel_file_util_decode_fixed_int32(in, &flags) == -1
        || camel_file_util_decode_time_t(in, &time) == -1
        || camel_file_util_decode_fixed_int32(in, &count) == -1) {
        return -1;
    }

    s->flags = flags;
    s->time = time;
    s->count = count;
    s->version = version;

    if (version < CAMEL_STORE_SUMMARY_VERSION_0) {
        g_warning("Store summary header version too low");
        return -1;
    }

    return 0;
}

static int
summary_header_save(CamelStoreSummary *s, FILE *out)
{
    fseek(out, 0, SEEK_SET);

    io(printf("Savining header\n"));

    /* always write latest version */
    camel_file_util_encode_fixed_int32(out, CAMEL_STORE_SUMMARY_VERSION);
    camel_file_util_encode_fixed_int32(out, s->flags);
    camel_file_util_encode_time_t(out, s->time);
    return camel_file_util_encode_fixed_int32(out, camel_store_summary_count(s));
}

/**
 * camel_store_summary_info_new:
 * @s: 
 * 
 * Allocate a new camel message info, suitable for adding
 * to this summary.
 * 
 * Return value: 
 **/
CamelStoreInfo *
camel_store_summary_info_new(CamelStoreSummary *s)
{
    CamelStoreInfo *mi;

    CAMEL_STORE_SUMMARY_LOCK(s, alloc_lock);
    if (s->store_info_chunks == NULL)
        s->store_info_chunks = e_memchunk_new(32, s->store_info_size);
    mi = e_memchunk_alloc0(s->store_info_chunks);
    CAMEL_STORE_SUMMARY_UNLOCK(s, alloc_lock);
    mi->refcount = 1;
    return mi;
}

const char *camel_store_info_string(CamelStoreSummary *s, const CamelStoreInfo *mi, int type)
{
    return ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->store_info_string(s, mi, type);
}

void camel_store_info_set_string(CamelStoreSummary *s, CamelStoreInfo *mi, int type, const char *value)
{
    return ((CamelStoreSummaryClass *)(CAMEL_OBJECT_GET_CLASS(s)))->store_info_set_string(s, mi, type, value);
}

static CamelStoreInfo *
store_info_new(CamelStoreSummary *s, const char *f)
{
    CamelStoreInfo *mi;

    mi = camel_store_summary_info_new(s);

    mi->path = g_strdup(f);
    mi->unread = CAMEL_STORE_INFO_FOLDER_UNKNOWN;
    mi->total = CAMEL_STORE_INFO_FOLDER_UNKNOWN;

    return mi;
}

static CamelStoreInfo *
store_info_load(CamelStoreSummary *s, FILE *in)
{
    CamelStoreInfo *mi;

    mi = camel_store_summary_info_new(s);

    io(printf("Loading folder info\n"));

    camel_file_util_decode_string(in, &mi->path);
    camel_file_util_decode_uint32(in, &mi->flags);
    camel_file_util_decode_uint32(in, &mi->unread);
    camel_file_util_decode_uint32(in, &mi->total);

    if (!ferror(in))
        return mi;

    camel_store_summary_info_free(s, mi);

    return NULL;
}

static int
store_info_save(CamelStoreSummary *s, FILE *out, CamelStoreInfo *mi)
{
    io(printf("Saving folder info\n"));

    camel_file_util_encode_string(out, camel_store_info_path(s, mi));
    camel_file_util_encode_uint32(out, mi->flags);
    camel_file_util_encode_uint32(out, mi->unread);
    camel_file_util_encode_uint32(out, mi->total);

    return ferror(out);
}

static void
store_info_free(CamelStoreSummary *s, CamelStoreInfo *mi)
{
    g_free(mi->path);
    g_free(mi->uri);
    e_memchunk_free(s->store_info_chunks, mi);
}

static const char *
store_info_string(CamelStoreSummary *s, const CamelStoreInfo *mi, int type)
{
    const char *p;

    /* FIXME: Locks? */

    g_assert (mi != NULL);

    switch (type) {
    case CAMEL_STORE_INFO_PATH:
        return mi->path;
    case CAMEL_STORE_INFO_NAME:
        p = strrchr(mi->path, '/');
        if (p)
            return p;
        else
            return mi->path;
    case CAMEL_STORE_INFO_URI:
        if (mi->uri == NULL) {
            CamelURL *uri;

            uri = camel_url_new_with_base(s->uri_base, mi->path);
            ((CamelStoreInfo *)mi)->uri = camel_url_to_string(uri, 0);
            camel_url_free(uri);
        }
        return mi->uri;
    }

    return "";
}

static void
store_info_set_string (CamelStoreSummary *s, CamelStoreInfo *mi, int type, const char *str)
{
    const char *p;
    char *v;
    int len;

    g_assert (mi != NULL);

    switch(type) {
    case CAMEL_STORE_INFO_PATH:
        CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
        g_hash_table_remove(s->folders_path, (char *)camel_store_info_path(s, mi));
        g_free(mi->path);
        g_free(mi->uri);
        mi->path = g_strdup(str);
        g_hash_table_insert(s->folders_path, (char *)camel_store_info_path(s, mi), mi);
        s->flags |= CAMEL_STORE_SUMMARY_DIRTY;
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        break;
    case CAMEL_STORE_INFO_NAME:
        CAMEL_STORE_SUMMARY_LOCK(s, summary_lock);
        g_hash_table_remove(s->folders_path, (char *)camel_store_info_path(s, mi));
        p = strrchr(mi->path, '/');
        if (p) {
            len = p-mi->path+1;
            v = g_malloc(len+strlen(str)+1);
            memcpy(v, mi->path, len);
            strcpy(v+len, str);
        } else {
            v = g_strdup(str);
        }
        g_free(mi->path);
        mi->path = v;
        g_hash_table_insert(s->folders_path, (char *)camel_store_info_path(s, mi), mi);
        CAMEL_STORE_SUMMARY_UNLOCK(s, summary_lock);
        break;
    case CAMEL_STORE_INFO_URI:
        g_warning("Cannot set store info uri, aborting");
        abort();
        break;
    }
}