From 6d0a0767ece8013d89d38431fd56c6a88072f00d Mon Sep 17 00:00:00 2001
From: Lukasz Pawelczyk <l.pawelczyk@samsung.com>
Date: Mon, 9 May 2016 15:55:29 +0200
Subject: [PATCH] write_file()/read_file() functions added

They are not used now, but they are very helpful for debugging and they
will be used in future examples.

Change-Id: Ia3cee5a67013543096cef45b04b649ce5faaf9e8
---
 examples/misc.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 examples/misc.h |  4 +++
 2 files changed, 88 insertions(+)

diff --git a/examples/misc.c b/examples/misc.c
index bd951e9..b3a8fdc 100644
--- a/examples/misc.c
+++ b/examples/misc.c
@@ -1,5 +1,8 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
+
+#include <yaca/crypto.h>
 
 #include <openssl/bio.h>
 #include "misc.h"
@@ -19,3 +22,84 @@ void debug_func(const char* buf)
 {
 	puts(buf);
 }
+
+int write_file(const char *path, char *data, size_t data_len)
+{
+	size_t written = 0;
+	FILE *f;
+
+	f = fopen(path, "w");
+	if (f == NULL)
+		return -1;
+
+	while (written != data_len) {
+		int ret = fwrite(data + written, 1, data_len - written, f);
+
+		if (ferror(f) != 0) {
+			fclose(f);
+			return -1;
+		}
+
+		written += ret;
+	}
+
+	fclose(f);
+	return 0;
+}
+
+#define BUF_SIZE 512
+
+int read_file(const char *path, char **data, size_t *data_len)
+{
+	int ret;
+	char tmp[BUF_SIZE];
+	char *buf = NULL;
+	size_t buf_len;
+	FILE *f;
+
+	f = fopen(path, "r");
+	if (f == NULL)
+		return -1;
+
+	for(;;) {
+		size_t read = fread(tmp, 1, BUF_SIZE, f);
+
+		if (read > 0) {
+			if (buf == NULL) {
+				buf = yaca_malloc(read);
+				if (buf == NULL) {
+					ret = -1;
+					break;
+				}
+				buf_len = 0;
+			} else {
+				char *new_buf = yaca_realloc(buf, buf_len + read);
+				if (new_buf == NULL) {
+					ret = -1;
+					break;
+				}
+				buf = new_buf;
+			}
+
+			memcpy(buf + buf_len, tmp, read);
+			buf_len += read;
+		}
+
+		if (ferror(f) != 0) {
+			ret = -1;
+			break;
+		}
+
+		if (feof(f)) {
+			*data = buf;
+			*data_len = buf_len;
+			buf = NULL;
+			ret = 0;
+			break;
+		}
+	}
+
+	fclose(f);
+	free(buf);
+	return ret;
+}
diff --git a/examples/misc.h b/examples/misc.h
index a4436f5..7d89758 100644
--- a/examples/misc.h
+++ b/examples/misc.h
@@ -37,4 +37,8 @@ void dump_hex(const char *buf,
 
 void debug_func(const char* buf);
 
+int write_file(const char *path, char *data, size_t data_len);
+
+int read_file(const char *path, char **data, size_t *data_len);
+
 #endif /* MISC_H */
-- 
2.7.4