1 files changed, 60 insertions, 0 deletions
diff --git a/queue.c b/queue.c
new file mode 100644
index 0000000..894bf2e
--- /dev/null
+++ b/queue.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2024 Mikhail Burakov. This file is part of streamer.
+ *
+ * streamer 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * streamer 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 streamer.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "queue.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+void QueueCreate(struct Queue* queue) {
+  memset(queue, 0, sizeof(struct Queue));
+}
+
+bool QueuePush(struct Queue* queue, void* item) {
+  if (queue->size == queue->alloc) {
+    size_t alloc = queue->alloc + 1;
+    void** buffer = malloc(alloc * sizeof(void*));
+    if (!buffer) return false;
+
+    size_t head_size = queue->read;
+    size_t tail_size = queue->size - queue->read;
+    memcpy(buffer, queue->buffer + queue->read, tail_size * sizeof(void*));
+    memcpy(buffer + tail_size, queue->buffer, head_size * sizeof(void*));
+    free(queue->buffer);
+
+    queue->buffer = buffer;
+    queue->alloc = alloc;
+    queue->read = 0;
+    queue->write = queue->size;
+  }
+
+  queue->buffer[queue->write] = item;
+  queue->write = (queue->write + 1) % queue->alloc;
+  queue->size++;
+  return true;
+}
+
+bool QueuePop(struct Queue* queue, void** pitem) {
+  if (!queue->size) return false;
+  *pitem = queue->buffer[queue->read];
+  queue->read = (queue->read + 1) % queue->alloc;
+  queue->size--;
+  return true;
+}
+
+void QueueDestroy(struct Queue* queue) { free(queue->buffer); }