--- /dev/null
+/* Copyright (c) 2016, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/pool.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include <openssl/buf.h>
+#include <openssl/bytestring.h>
+#include <openssl/mem.h>
+#include <openssl/thread.h>
+
+#include "../internal.h"
+#include "internal.h"
+
+
+static uint32_t CRYPTO_BUFFER_hash(const CRYPTO_BUFFER *buf) {
+ return OPENSSL_hash32(buf->data, buf->len);
+}
+
+static int CRYPTO_BUFFER_cmp(const CRYPTO_BUFFER *a, const CRYPTO_BUFFER *b) {
+ if (a->len != b->len) {
+ return 1;
+ }
+ return OPENSSL_memcmp(a->data, b->data, a->len);
+}
+
+CRYPTO_BUFFER_POOL* CRYPTO_BUFFER_POOL_new(void) {
+ CRYPTO_BUFFER_POOL *pool = OPENSSL_malloc(sizeof(CRYPTO_BUFFER_POOL));
+ if (pool == NULL) {
+ return NULL;
+ }
+
+ OPENSSL_memset(pool, 0, sizeof(CRYPTO_BUFFER_POOL));
+ pool->bufs = lh_CRYPTO_BUFFER_new(CRYPTO_BUFFER_hash, CRYPTO_BUFFER_cmp);
+ if (pool->bufs == NULL) {
+ OPENSSL_free(pool);
+ return NULL;
+ }
+
+ CRYPTO_MUTEX_init(&pool->lock);
+
+ return pool;
+}
+
+void CRYPTO_BUFFER_POOL_free(CRYPTO_BUFFER_POOL *pool) {
+ if (pool == NULL) {
+ return;
+ }
+
+#if !defined(NDEBUG)
+ CRYPTO_MUTEX_lock_write(&pool->lock);
+ assert(lh_CRYPTO_BUFFER_num_items(pool->bufs) == 0);
+ CRYPTO_MUTEX_unlock_write(&pool->lock);
+#endif
+
+ lh_CRYPTO_BUFFER_free(pool->bufs);
+ CRYPTO_MUTEX_cleanup(&pool->lock);
+ OPENSSL_free(pool);
+}
+
+CRYPTO_BUFFER *CRYPTO_BUFFER_new(const uint8_t *data, size_t len,
+ CRYPTO_BUFFER_POOL *pool) {
+ if (pool != NULL) {
+ CRYPTO_BUFFER tmp;
+ tmp.data = (uint8_t *) data;
+ tmp.len = len;
+
+ CRYPTO_MUTEX_lock_read(&pool->lock);
+ CRYPTO_BUFFER *const duplicate =
+ lh_CRYPTO_BUFFER_retrieve(pool->bufs, &tmp);
+ if (duplicate != NULL) {
+ CRYPTO_refcount_inc(&duplicate->references);
+ }
+ CRYPTO_MUTEX_unlock_read(&pool->lock);
+
+ if (duplicate != NULL) {
+ return duplicate;
+ }
+ }
+
+ CRYPTO_BUFFER *const buf = OPENSSL_malloc(sizeof(CRYPTO_BUFFER));
+ if (buf == NULL) {
+ return NULL;
+ }
+ OPENSSL_memset(buf, 0, sizeof(CRYPTO_BUFFER));
+
+ buf->data = BUF_memdup(data, len);
+ if (len != 0 && buf->data == NULL) {
+ OPENSSL_free(buf);
+ return NULL;
+ }
+
+ buf->len = len;
+ buf->references = 1;
+
+ if (pool == NULL) {
+ return buf;
+ }
+
+ buf->pool = pool;
+
+ CRYPTO_MUTEX_lock_write(&pool->lock);
+ CRYPTO_BUFFER *duplicate = lh_CRYPTO_BUFFER_retrieve(pool->bufs, buf);
+ int inserted = 0;
+ if (duplicate == NULL) {
+ CRYPTO_BUFFER *old = NULL;
+ inserted = lh_CRYPTO_BUFFER_insert(pool->bufs, &old, buf);
+ assert(old == NULL);
+ } else {
+ CRYPTO_refcount_inc(&duplicate->references);
+ }
+ CRYPTO_MUTEX_unlock_write(&pool->lock);
+
+ if (!inserted) {
+ // We raced to insert |buf| into the pool and lost, or else there was an
+ // error inserting.
+ OPENSSL_free(buf->data);
+ OPENSSL_free(buf);
+ return duplicate;
+ }
+
+ return buf;
+}
+
+CRYPTO_BUFFER* CRYPTO_BUFFER_new_from_CBS(CBS *cbs, CRYPTO_BUFFER_POOL *pool) {
+ return CRYPTO_BUFFER_new(CBS_data(cbs), CBS_len(cbs), pool);
+}
+
+void CRYPTO_BUFFER_free(CRYPTO_BUFFER *buf) {
+ if (buf == NULL) {
+ return;
+ }
+
+ CRYPTO_BUFFER_POOL *const pool = buf->pool;
+ if (pool == NULL) {
+ if (CRYPTO_refcount_dec_and_test_zero(&buf->references)) {
+ // If a reference count of zero is observed, there cannot be a reference
+ // from any pool to this buffer and thus we are able to free this
+ // buffer.
+ OPENSSL_free(buf->data);
+ OPENSSL_free(buf);
+ }
+
+ return;
+ }
+
+ CRYPTO_MUTEX_lock_write(&pool->lock);
+ if (!CRYPTO_refcount_dec_and_test_zero(&buf->references)) {
+ CRYPTO_MUTEX_unlock_write(&buf->pool->lock);
+ return;
+ }
+
+ // We have an exclusive lock on the pool, therefore no concurrent lookups can
+ // find this buffer and increment the reference count. Thus, if the count is
+ // zero there are and can never be any more references and thus we can free
+ // this buffer.
+ void *found = lh_CRYPTO_BUFFER_delete(pool->bufs, buf);
+ assert(found != NULL);
+ assert(found == buf);
+ (void)found;
+ CRYPTO_MUTEX_unlock_write(&buf->pool->lock);
+ OPENSSL_free(buf->data);
+ OPENSSL_free(buf);
+}
+
+int CRYPTO_BUFFER_up_ref(CRYPTO_BUFFER *buf) {
+ // This is safe in the case that |buf->pool| is NULL because it's just
+ // standard reference counting in that case.
+ //
+ // This is also safe if |buf->pool| is non-NULL because, if it were racing
+ // with |CRYPTO_BUFFER_free| then the two callers must have independent
+ // references already and so the reference count will never hit zero.
+ CRYPTO_refcount_inc(&buf->references);
+ return 1;
+}
+
+const uint8_t *CRYPTO_BUFFER_data(const CRYPTO_BUFFER *buf) {
+ return buf->data;
+}
+
+size_t CRYPTO_BUFFER_len(const CRYPTO_BUFFER *buf) {
+ return buf->len;
+}
+
+void CRYPTO_BUFFER_init_CBS(const CRYPTO_BUFFER *buf, CBS *out) {
+ CBS_init(out, buf->data, buf->len);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff