Add a simple char buffer implementation

include/Makefile.am

@@ -3,4 +3,5 @@ nobase_include_HEADERS = \
 	libimobiledevice-glue/thread.h \
 	libimobiledevice-glue/utils.h \
 	libimobiledevice-glue/collection.h \
-	libimobiledevice-glue/termcolors.h
+	libimobiledevice-glue/termcolors.h \
+	libimobiledevice-glue/cbuf.h

include/libimobiledevice-glue/cbuf.h

@@ -0,0 +1,35 @@
+/*
+ * cbuf.h
+ * Simple char buffer implementation.
+ *
+ * Copyright (c) 2021 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __CBUF_H
+#define __CBUF_H
+
+struct char_buf {
+	unsigned char* data;
+	unsigned int length;
+	unsigned int capacity;
+};
+
+struct char_buf* char_buf_new();
+void char_buf_free(struct char_buf* cbuf);
+void char_buf_append(struct char_buf* cbuf, unsigned int length, unsigned char* data);
+
+#endif /* __CBUF_H */

src/Makefile.am

@@ -14,6 +14,7 @@ libimobiledevice_glue_1_0_la_SOURCES =	\
 	utils.c		\
 	collection.c	\
 	termcolors.c	\
+	cbuf.c          \
 	common.h
 
 if WIN32

src/cbuf.c

@@ -0,0 +1,67 @@
+/*
+ * cbuf.c
+ * Simple char buffer implementation.
+ *
+ * Copyright (c) 2021 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "common.h"
+#include "libimobiledevice-glue/cbuf.h"
+
+LIBIMOBILEDEVICE_GLUE_API struct char_buf* char_buf_new()
+{
+	struct char_buf* cbuf = (struct char_buf*)malloc(sizeof(struct char_buf));
+	cbuf->capacity = 256;
+	cbuf->length = 0;
+	cbuf->data = (unsigned char*)malloc(cbuf->capacity);
+	return cbuf;
+}
+
+LIBIMOBILEDEVICE_GLUE_API void char_buf_free(struct char_buf* cbuf)
+{
+	if (cbuf) {
+		free(cbuf->data);
+		free(cbuf);
+	}
+}
+
+LIBIMOBILEDEVICE_GLUE_API void char_buf_append(struct char_buf* cbuf, unsigned int length, unsigned char* data)
+{
+	if (!cbuf || !cbuf->data) {
+		return;
+	}
+	if (cbuf->length + length > cbuf->capacity) {
+		unsigned int newcapacity = cbuf->capacity + ((length / 256) + 1) * 256;
+		unsigned char* newdata = realloc(cbuf->data, newcapacity);
+		if (!newdata) {
+			fprintf(stderr, "%s: ERROR: Failed to realloc\n", __func__);
+			return;
+		}
+		cbuf->data = newdata;
+		cbuf->capacity = newcapacity;
+	}
+	memcpy(cbuf->data + cbuf->length, data, length);
+	cbuf->length += length;
+}