HGKeeper

* purple

* Purple is the legal property of its developers, whose names are too numerous

* to list here. Please refer to the COPYRIGHT file distributed with this

* source distribution.

* This program 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 2 of the License, or

* (at your option) any later version.

* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA

#include "internal.h"

#include "sha256hash.h"

/*******************************************************************************

* Structs

******************************************************************************/

#define PURPLE_SHA256_HASH_GET_PRIVATE(obj) \

(G_TYPE_INSTANCE_GET_PRIVATE((obj), PURPLE_TYPE_SHA256_HASH, PurpleSHA256HashPrivate))

typedef struct {

GChecksum *checksum;

} PurpleSHA256HashPrivate;

/******************************************************************************

* Globals

*****************************************************************************/

static GObjectClass *parent_class = NULL;

/******************************************************************************

* Hash Stuff

*****************************************************************************/

static void

purple_sha256_hash_reset(PurpleHash *hash)

{

PurpleSHA256Hash *sha256_hash = PURPLE_SHA256_HASH(hash);

PurpleSHA256HashPrivate *priv = PURPLE_SHA256_HASH_GET_PRIVATE(sha256_hash);

g_return_if_fail(priv != NULL);

g_return_if_fail(priv->checksum != NULL);

g_checksum_reset(priv->checksum);

}

static void

purple_sha256_hash_append(PurpleHash *hash, const guchar *data,

gsize len)

{

PurpleSHA256Hash *sha256_hash = PURPLE_SHA256_HASH(hash);

PurpleSHA256HashPrivate *priv = PURPLE_SHA256_HASH_GET_PRIVATE(sha256_hash);

g_return_if_fail(priv != NULL);

g_return_if_fail(priv->checksum != NULL);

while (len >= G_MAXSSIZE) {

g_checksum_update(priv->checksum, data, G_MAXSSIZE);

len -= G_MAXSSIZE;

data += G_MAXSSIZE;

}

if (len)

g_checksum_update(priv->checksum, data, len);

}

static gboolean

purple_sha256_hash_digest(PurpleHash *hash, guchar *digest, size_t buff_len)

{

PurpleSHA256Hash *sha256_hash = PURPLE_SHA256_HASH(hash);

PurpleSHA256HashPrivate *priv = PURPLE_SHA256_HASH_GET_PRIVATE(sha256_hash);

const gssize required_len = g_checksum_type_get_length(G_CHECKSUM_SHA256);

gsize digest_len = buff_len;

g_return_val_if_fail(priv != NULL, FALSE);

g_return_val_if_fail(priv->checksum != NULL, FALSE);

g_return_val_if_fail(required_len >= 0, FALSE);

g_return_val_if_fail(buff_len >= (gsize)required_len, FALSE);

g_checksum_get_digest(priv->checksum, digest, &digest_len);

if (digest_len != (gsize)required_len)

return FALSE;

purple_sha256_hash_reset(hash);

return TRUE;

}

static size_t

purple_sha256_hash_get_block_size(PurpleHash *hash)

{

return 64;

}

static size_t

purple_sha256_hash_get_digest_size(PurpleHash *hash)

{

return g_checksum_type_get_length(G_CHECKSUM_SHA256);

}

/******************************************************************************

* Object Stuff

*****************************************************************************/

static void

purple_sha256_hash_finalize(GObject *obj)

{

PurpleSHA256Hash *sha256_hash = PURPLE_SHA256_HASH(obj);

PurpleSHA256HashPrivate *priv = PURPLE_SHA256_HASH_GET_PRIVATE(sha256_hash);

if (priv->checksum)

g_checksum_free(priv->checksum);

parent_class->finalize(obj);

}

static void

purple_sha256_hash_class_init(PurpleSHA256HashClass *klass) {

GObjectClass *obj_class = G_OBJECT_CLASS(klass);

PurpleHashClass *hash_class = PURPLE_HASH_CLASS(klass);

parent_class = g_type_class_peek_parent(klass);

obj_class->finalize = purple_sha256_hash_finalize;

hash_class->reset = purple_sha256_hash_reset;

hash_class->reset_state = purple_sha256_hash_reset;

hash_class->append = purple_sha256_hash_append;

hash_class->digest = purple_sha256_hash_digest;

hash_class->get_digest_size = purple_sha256_hash_get_digest_size;

hash_class->get_block_size = purple_sha256_hash_get_block_size;

g_type_class_add_private(klass, sizeof(PurpleSHA256HashPrivate));

}

static void

purple_sha256_hash_init(PurpleHash *hash)

{

PurpleSHA256Hash *sha256_hash = PURPLE_SHA256_HASH(hash);

PurpleSHA256HashPrivate *priv = PURPLE_SHA256_HASH_GET_PRIVATE(sha256_hash);

priv->checksum = g_checksum_new(G_CHECKSUM_SHA256);

purple_sha256_hash_reset(hash);

}

/******************************************************************************

* API

*****************************************************************************/

GType

purple_sha256_hash_get_type(void) {

static GType type = 0;

if(type == 0) {

static const GTypeInfo info = {

sizeof(PurpleSHA256HashClass),

NULL,

(GClassInitFunc)purple_sha256_hash_class_init,

NULL,

sizeof(PurpleSHA256Hash),

(GInstanceInitFunc)purple_sha256_hash_init,

NULL,

};

type = g_type_register_static(PURPLE_TYPE_HASH,

"PurpleSHA256Hash",

&info, 0);

}

return type;

}

PurpleHash *

purple_sha256_hash_new(void) {

return g_object_new(PURPLE_TYPE_SHA256_HASH, NULL);

}

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