DFU: add module for store the image

Store image in sequence of certain blocks.
Module is intended to be use by a higher-level
image management protocol module

Signed-off-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

subsys/dfu/img_util/Makefile

@@ -0,0 +1,3 @@
+obj-$(CONFIG_MCUBOOT_IMG_MANAGER) += flash_img.o
+ccflags-$(CONFIG_MCUBOOT_IMG_MANAGER) += -I${ZEPHYR_BASE}/include/dfu
+ccflags-$(CONFIG_MCUBOOT_IMG_MANAGER) += -I${ZEPHYR_BASE}/subsys/dfu

subsys/dfu/img_util/flash_img.c

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2017 Nordic Semiconductor ASA
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define SYS_LOG_DOMAIN "fota/flash_block"
+#define SYS_LOG_LEVEL CONFIG_SYS_LOG_IMG_MANAGER_LEVEL
+#include <logging/sys_log.h>
+
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <flash.h>
+#include "boot/mcuboot_constraints.h"
+#include "flash_img.h"
+
+BUILD_ASSERT_MSG((CONFIG_IMG_BLOCK_BUF_SIZE % FLASH_ALIGN == 0),
+		 "CONFIG_IMG_BLOCK_BUF_SIZE is not multiple of FLASH_ALIGN");
+
+static bool flash_verify(struct device *dev, off_t offset,
+			 u8_t *data, size_t len)
+{
+	size_t size;
+	u32_t temp;
+	int rc;
+
+	while (len) {
+		size = (len >= sizeof(temp)) ? sizeof(temp) : len;
+		rc = flash_read(dev, offset, &temp, size);
+		if (rc) {
+			SYS_LOG_ERR("flash_read error %d offset=0x%08x",
+				    rc, offset);
+			break;
+		}
+
+		if (memcmp(data, &temp, size)) {
+			SYS_LOG_ERR("offset=0x%08x VERIFY FAIL. "
+				    "expected: 0x%08x, actual: 0x%08x",
+				    offset, temp, *(__packed u32_t*)data);
+			break;
+		}
+		len -= size;
+		offset += size;
+		data += size;
+	}
+
+	return (len == 0) ? true : false;
+}
+
+/* buffer data into block writes */
+static int flash_block_write(struct flash_img_context *ctx, off_t offset,
+			     u8_t *data, size_t len, bool finished)
+{
+	int processed = 0;
+	int rc = 0;
+
+	while ((len - processed) >
+	       (CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes)) {
+		memcpy(ctx->buf + ctx->buf_bytes, data + processed,
+		       (CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes));
+
+		flash_write_protection_set(ctx->dev, false);
+		rc = flash_write(ctx->dev, offset + ctx->bytes_written,
+				 ctx->buf, CONFIG_IMG_BLOCK_BUF_SIZE);
+		flash_write_protection_set(ctx->dev, true);
+		if (rc) {
+			SYS_LOG_ERR("flash_write error %d offset=0x%08x",
+				    rc, offset + ctx->bytes_written);
+			return rc;
+		}
+
+		if (!flash_verify(ctx->dev, offset + ctx->bytes_written,
+				  ctx->buf, CONFIG_IMG_BLOCK_BUF_SIZE)) {
+			return -EIO;
+		}
+
+		ctx->bytes_written += CONFIG_IMG_BLOCK_BUF_SIZE;
+		processed += (CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes);
+		ctx->buf_bytes = 0;
+	}
+
+	/* place rest of the data into ctx->buf */
+	if (processed < len) {
+		memcpy(ctx->buf + ctx->buf_bytes,
+		       data + processed, len - processed);
+		ctx->buf_bytes += len - processed;
+	}
+
+	if (finished && ctx->buf_bytes > 0) {
+		/* pad the rest of ctx->buf and write it out */
+		memset(ctx->buf + ctx->buf_bytes, 0xFF,
+		       CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes);
+
+		flash_write_protection_set(ctx->dev, false);
+		rc = flash_write(ctx->dev, offset + ctx->bytes_written,
+				 ctx->buf, CONFIG_IMG_BLOCK_BUF_SIZE);
+		flash_write_protection_set(ctx->dev, true);
+		if (rc) {
+			SYS_LOG_ERR("flash_write error %d offset=0x%08x",
+				    rc, offset + ctx->bytes_written);
+			return rc;
+		}
+
+		if (!flash_verify(ctx->dev, offset + ctx->bytes_written,
+				  ctx->buf, CONFIG_IMG_BLOCK_BUF_SIZE)) {
+			return -EIO;
+		}
+
+		ctx->bytes_written = ctx->bytes_written + ctx->buf_bytes;
+		ctx->buf_bytes = 0;
+	}
+
+	return rc;
+}
+
+size_t flash_img_bytes_written(struct flash_img_context *ctx)
+{
+	return ctx->bytes_written;
+}
+
+void flash_img_init(struct flash_img_context *ctx, struct device *dev)
+{
+	ctx->dev = dev;
+	ctx->bytes_written = 0;
+	ctx->buf_bytes = 0;
+}
+
+int flash_img_buffered_write(struct flash_img_context *ctx, u8_t *data,
+			     size_t len, bool flush)
+{
+	return flash_block_write(ctx, FLASH_AREA_IMAGE_1_OFFSET, data, len,
+				 flush);
+}