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-rw-r--r--security/nss/lib/util/secitem.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/security/nss/lib/util/secitem.c b/security/nss/lib/util/secitem.c
new file mode 100644
index 0000000000..cd69961782
--- /dev/null
+++ b/security/nss/lib/util/secitem.c
@@ -0,0 +1,496 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Support routines for SECItem data structure.
+ */
+
+#include "seccomon.h"
+#include "secitem.h"
+#include "secerr.h"
+#include "secport.h"
+
+SECItem *
+SECITEM_AllocItem(PLArenaPool *arena, SECItem *item, unsigned int len)
+{
+ SECItem *result = NULL;
+ void *mark = NULL;
+
+ if (arena != NULL) {
+ mark = PORT_ArenaMark(arena);
+ }
+
+ if (item == NULL) {
+ if (arena != NULL) {
+ result = PORT_ArenaZAlloc(arena, sizeof(SECItem));
+ } else {
+ result = PORT_ZAlloc(sizeof(SECItem));
+ }
+ if (result == NULL) {
+ goto loser;
+ }
+ } else {
+ PORT_Assert(item->data == NULL);
+ result = item;
+ }
+
+ result->len = len;
+ if (len) {
+ if (arena != NULL) {
+ result->data = PORT_ArenaAlloc(arena, len);
+ } else {
+ result->data = PORT_Alloc(len);
+ }
+ if (result->data == NULL) {
+ goto loser;
+ }
+ } else {
+ result->data = NULL;
+ }
+
+ if (mark) {
+ PORT_ArenaUnmark(arena, mark);
+ }
+ return (result);
+
+loser:
+ if (arena != NULL) {
+ if (mark) {
+ PORT_ArenaRelease(arena, mark);
+ }
+ if (item != NULL) {
+ item->data = NULL;
+ item->len = 0;
+ }
+ } else {
+ if (result != NULL) {
+ SECITEM_FreeItem(result, (item == NULL) ? PR_TRUE : PR_FALSE);
+ }
+ /*
+ * If item is not NULL, the above has set item->data and
+ * item->len to 0.
+ */
+ }
+ return (NULL);
+}
+
+SECStatus
+SECITEM_MakeItem(PLArenaPool *arena, SECItem *dest, const unsigned char *data,
+ unsigned int len)
+{
+ SECItem it = { siBuffer, (unsigned char *)data, len };
+
+ return SECITEM_CopyItem(arena, dest, &it);
+}
+
+SECStatus
+SECITEM_ReallocItem(PLArenaPool *arena, SECItem *item, unsigned int oldlen,
+ unsigned int newlen)
+{
+ PORT_Assert(item != NULL);
+ if (item == NULL) {
+ /* XXX Set error. But to what? */
+ return SECFailure;
+ }
+
+ /*
+ * If no old length, degenerate to just plain alloc.
+ */
+ if (oldlen == 0) {
+ PORT_Assert(item->data == NULL || item->len == 0);
+ if (newlen == 0) {
+ /* Nothing to do. Weird, but not a failure. */
+ return SECSuccess;
+ }
+ item->len = newlen;
+ if (arena != NULL) {
+ item->data = PORT_ArenaAlloc(arena, newlen);
+ } else {
+ item->data = PORT_Alloc(newlen);
+ }
+ } else {
+ if (arena != NULL) {
+ item->data = PORT_ArenaGrow(arena, item->data, oldlen, newlen);
+ } else {
+ item->data = PORT_Realloc(item->data, newlen);
+ }
+ }
+
+ if (item->data == NULL) {
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+SECStatus
+SECITEM_ReallocItemV2(PLArenaPool *arena, SECItem *item, unsigned int newlen)
+{
+ unsigned char *newdata = NULL;
+
+ PORT_Assert(item);
+ if (!item) {
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return SECFailure;
+ }
+
+ if (item->len == newlen) {
+ return SECSuccess;
+ }
+
+ if (!newlen) {
+ if (!arena) {
+ PORT_Free(item->data);
+ }
+ item->data = NULL;
+ item->len = 0;
+ return SECSuccess;
+ }
+
+ if (!item->data) {
+ /* allocate fresh block of memory */
+ PORT_Assert(!item->len);
+ if (arena) {
+ newdata = PORT_ArenaAlloc(arena, newlen);
+ } else {
+ newdata = PORT_Alloc(newlen);
+ }
+ } else {
+ /* reallocate or adjust existing block of memory */
+ if (arena) {
+ if (item->len > newlen) {
+ /* There's no need to realloc a shorter block from the arena,
+ * because it would result in using even more memory!
+ * Therefore we'll continue to use the old block and
+ * set the item to the shorter size.
+ */
+ item->len = newlen;
+ return SECSuccess;
+ }
+ newdata = PORT_ArenaGrow(arena, item->data, item->len, newlen);
+ } else {
+ newdata = PORT_Realloc(item->data, newlen);
+ }
+ }
+
+ if (!newdata) {
+ PORT_SetError(SEC_ERROR_NO_MEMORY);
+ return SECFailure;
+ }
+
+ item->len = newlen;
+ item->data = newdata;
+ return SECSuccess;
+}
+
+SECComparison
+SECITEM_CompareItem(const SECItem *a, const SECItem *b)
+{
+ unsigned m;
+ int rv;
+
+ if (a == b)
+ return SECEqual;
+ if (!a || !a->len || !a->data)
+ return (!b || !b->len || !b->data) ? SECEqual : SECLessThan;
+ if (!b || !b->len || !b->data)
+ return SECGreaterThan;
+
+ m = ((a->len < b->len) ? a->len : b->len);
+
+ rv = PORT_Memcmp(a->data, b->data, m);
+ if (rv) {
+ return rv < 0 ? SECLessThan : SECGreaterThan;
+ }
+ if (a->len < b->len) {
+ return SECLessThan;
+ }
+ if (a->len == b->len) {
+ return SECEqual;
+ }
+ return SECGreaterThan;
+}
+
+PRBool
+SECITEM_ItemsAreEqual(const SECItem *a, const SECItem *b)
+{
+ if (a->len != b->len)
+ return PR_FALSE;
+ if (!a->len)
+ return PR_TRUE;
+ if (!a->data || !b->data) {
+ /* avoid null pointer crash. */
+ return (PRBool)(a->data == b->data);
+ }
+ return (PRBool)!PORT_Memcmp(a->data, b->data, a->len);
+}
+
+SECItem *
+SECITEM_DupItem(const SECItem *from)
+{
+ return SECITEM_ArenaDupItem(NULL, from);
+}
+
+SECItem *
+SECITEM_ArenaDupItem(PLArenaPool *arena, const SECItem *from)
+{
+ SECItem *to;
+
+ if (from == NULL) {
+ return (NULL);
+ }
+
+ if (arena != NULL) {
+ to = (SECItem *)PORT_ArenaAlloc(arena, sizeof(SECItem));
+ } else {
+ to = (SECItem *)PORT_Alloc(sizeof(SECItem));
+ }
+ if (to == NULL) {
+ return (NULL);
+ }
+
+ if (arena != NULL) {
+ to->data = (unsigned char *)PORT_ArenaAlloc(arena, from->len);
+ } else {
+ to->data = (unsigned char *)PORT_Alloc(from->len);
+ }
+ if (to->data == NULL) {
+ PORT_Free(to);
+ return (NULL);
+ }
+
+ to->len = from->len;
+ to->type = from->type;
+ if (to->len) {
+ PORT_Memcpy(to->data, from->data, to->len);
+ }
+
+ return (to);
+}
+
+SECStatus
+SECITEM_CopyItem(PLArenaPool *arena, SECItem *to, const SECItem *from)
+{
+ to->type = from->type;
+ if (from->data && from->len) {
+ if (arena) {
+ to->data = (unsigned char *)PORT_ArenaAlloc(arena, from->len);
+ } else {
+ to->data = (unsigned char *)PORT_Alloc(from->len);
+ }
+
+ if (!to->data) {
+ return SECFailure;
+ }
+ PORT_Memcpy(to->data, from->data, from->len);
+ to->len = from->len;
+ } else {
+ /*
+ * If from->data is NULL but from->len is nonzero, this function
+ * will succeed. Is this right?
+ */
+ to->data = 0;
+ to->len = 0;
+ }
+ return SECSuccess;
+}
+
+void
+SECITEM_FreeItem(SECItem *zap, PRBool freeit)
+{
+ if (zap) {
+ PORT_Free(zap->data);
+ zap->data = 0;
+ zap->len = 0;
+ if (freeit) {
+ PORT_Free(zap);
+ }
+ }
+}
+
+void
+SECITEM_ZfreeItem(SECItem *zap, PRBool freeit)
+{
+ if (zap) {
+ PORT_ZFree(zap->data, zap->len);
+ zap->data = 0;
+ zap->len = 0;
+ if (freeit) {
+ PORT_ZFree(zap, sizeof(SECItem));
+ }
+ }
+}
+/* these reroutines were taken from pkix oid.c, which is supposed to
+ * replace this file some day */
+/*
+ * This is the hash function. We simply XOR the encoded form with
+ * itself in sizeof(PLHashNumber)-byte chunks. Improving this
+ * routine is left as an excercise for the more mathematically
+ * inclined student.
+ */
+PLHashNumber PR_CALLBACK
+SECITEM_Hash(const void *key)
+{
+ const SECItem *item = (const SECItem *)key;
+ PLHashNumber rv = 0;
+
+ PRUint8 *data = (PRUint8 *)item->data;
+ PRUint32 i;
+ PRUint8 *rvc = (PRUint8 *)&rv;
+
+ for (i = 0; i < item->len; i++) {
+ rvc[i % sizeof(rv)] ^= *data;
+ data++;
+ }
+
+ return rv;
+}
+
+/*
+ * This is the key-compare function. It simply does a lexical
+ * comparison on the item data. This does not result in
+ * quite the same ordering as the "sequence of numbers" order,
+ * but heck it's only used internally by the hash table anyway.
+ */
+PRIntn PR_CALLBACK
+SECITEM_HashCompare(const void *k1, const void *k2)
+{
+ const SECItem *i1 = (const SECItem *)k1;
+ const SECItem *i2 = (const SECItem *)k2;
+
+ return SECITEM_ItemsAreEqual(i1, i2);
+}
+
+SECItemArray *
+SECITEM_AllocArray(PLArenaPool *arena, SECItemArray *array, unsigned int len)
+{
+ SECItemArray *result = NULL;
+ void *mark = NULL;
+
+ if (array != NULL && array->items != NULL) {
+ PORT_Assert(0);
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return NULL;
+ }
+
+ if (arena != NULL) {
+ mark = PORT_ArenaMark(arena);
+ }
+
+ if (array == NULL) {
+ if (arena != NULL) {
+ result = PORT_ArenaZAlloc(arena, sizeof(SECItemArray));
+ } else {
+ result = PORT_ZAlloc(sizeof(SECItemArray));
+ }
+ if (result == NULL) {
+ goto loser;
+ }
+ } else {
+ result = array;
+ }
+
+ result->len = len;
+ if (len) {
+ if (arena != NULL) {
+ result->items = PORT_ArenaZNewArray(arena, SECItem, len);
+ } else {
+ result->items = PORT_ZNewArray(SECItem, len);
+ }
+ if (result->items == NULL) {
+ goto loser;
+ }
+ } else {
+ result->items = NULL;
+ }
+
+ if (mark) {
+ PORT_ArenaUnmark(arena, mark);
+ }
+ return result;
+
+loser:
+ if (arena != NULL) {
+ if (mark) {
+ PORT_ArenaRelease(arena, mark);
+ }
+ } else {
+ if (result != NULL && array == NULL) {
+ PORT_Free(result);
+ }
+ }
+ if (array != NULL) {
+ array->items = NULL;
+ array->len = 0;
+ }
+ return NULL;
+}
+
+static void
+secitem_FreeArray(SECItemArray *array, PRBool zero_items, PRBool freeit)
+{
+ unsigned int i;
+
+ if (!array || !array->len || !array->items)
+ return;
+
+ for (i = 0; i < array->len; ++i) {
+ SECItem *item = &array->items[i];
+
+ if (item->data) {
+ if (zero_items) {
+ SECITEM_ZfreeItem(item, PR_FALSE);
+ } else {
+ SECITEM_FreeItem(item, PR_FALSE);
+ }
+ }
+ }
+ PORT_Free(array->items);
+ array->items = NULL;
+ array->len = 0;
+
+ if (freeit)
+ PORT_Free(array);
+}
+
+void
+SECITEM_FreeArray(SECItemArray *array, PRBool freeit)
+{
+ secitem_FreeArray(array, PR_FALSE, freeit);
+}
+
+void
+SECITEM_ZfreeArray(SECItemArray *array, PRBool freeit)
+{
+ secitem_FreeArray(array, PR_TRUE, freeit);
+}
+
+SECItemArray *
+SECITEM_DupArray(PLArenaPool *arena, const SECItemArray *from)
+{
+ SECItemArray *result;
+ unsigned int i;
+
+ /* Require a "from" array.
+ * Reject an inconsistent "from" array with NULL data and nonzero length.
+ * However, allow a "from" array of zero length.
+ */
+ if (!from || (!from->items && from->len))
+ return NULL;
+
+ result = SECITEM_AllocArray(arena, NULL, from->len);
+ if (!result)
+ return NULL;
+
+ for (i = 0; i < from->len; ++i) {
+ SECStatus rv = SECITEM_CopyItem(arena,
+ &result->items[i], &from->items[i]);
+ if (rv != SECSuccess) {
+ SECITEM_ZfreeArray(result, PR_TRUE);
+ return NULL;
+ }
+ }
+
+ return result;
+}