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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2021-03-06 16:56:59 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2021-03-06 22:08:36 +0100
commitb8f5b8d89dfc3a86e4f371fac7331372c2d0c901 (patch)
tree49e7c6584db67646c49674a89d21e0b5bb03fc7b /lib/util/array.c
parent8e2b5d633d1e33ec7bc478bf97b2f1e94776b925 (diff)
Add a generic implementation of a dynamic array to libutil
The intention is to get rid of all the ad-hoc array implementations in the other components and cut down code size. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/util/array.c')
-rw-r--r--lib/util/array.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/lib/util/array.c b/lib/util/array.c
new file mode 100644
index 0000000..3697a07
--- /dev/null
+++ b/lib/util/array.c
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * array.c
+ *
+ * Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+#include "array.h"
+
+#include "sqfs/error.h"
+
+#include <stdlib.h>
+
+int array_init(array_t *array, size_t size, size_t capacity)
+{
+ size_t total;
+
+ memset(array, 0, sizeof(*array));
+
+ if (capacity > 0) {
+ if (SZ_MUL_OV(size, capacity, &total))
+ return SQFS_ERROR_OVERFLOW;
+
+ array->data = malloc(total);
+ if (array->data == NULL)
+ return SQFS_ERROR_ALLOC;
+ }
+
+ array->size = size;
+ array->count = capacity;
+ return 0;
+}
+
+int array_init_copy(array_t *array, const array_t *src)
+{
+ int ret;
+
+ ret = array_init(array, src->size, src->used);
+ if (ret != 0)
+ return ret;
+
+ memcpy(array->data, src->data, src->used * src->size);
+ array->used = src->used;
+ return 0;
+}
+
+void array_cleanup(array_t *array)
+{
+ free(array->data);
+ memset(array, 0, sizeof(*array));
+}
+
+int array_append(array_t *array, const void *data)
+{
+ size_t new_sz, new_count;
+ void *new;
+
+ if (array->used == array->count) {
+ if (array->count == 0) {
+ new_count = 128;
+ } else {
+ if (SZ_MUL_OV(array->count, 2, &new_count))
+ return SQFS_ERROR_ALLOC;
+ }
+
+ if (SZ_MUL_OV(new_count, array->size, &new_sz))
+ return SQFS_ERROR_ALLOC;
+
+ new = realloc(array->data, new_sz);
+ if (new == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ array->data = new;
+ array->count = new_count;
+ }
+
+ memcpy((char *)array->data + array->size * array->used,
+ data, array->size);
+
+ array->used += 1;
+ return 0;
+}
+
+int array_set_capacity(array_t *array, size_t capacity)
+{
+ size_t new_sz, new_count;
+ void *new;
+
+ if (capacity <= array->count)
+ return 0;
+
+ if (array->count == 0) {
+ new_count = 128;
+ } else {
+ if (SZ_MUL_OV(array->count, 2, &new_count))
+ return SQFS_ERROR_ALLOC;
+ }
+
+ while (new_count < capacity) {
+ if (SZ_MUL_OV(new_count, 2, &new_count))
+ return SQFS_ERROR_ALLOC;
+ }
+
+ if (SZ_MUL_OV(new_count, array->size, &new_sz))
+ return SQFS_ERROR_ALLOC;
+
+ new = realloc(array->data, new_sz);
+ if (new == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ array->data = new;
+ array->count = new_count;
+ return 0;
+}