flash/nor/tcl: Respect flash bank boundary in verify_bank

Respect the flash bank boundary and compare only the remaining content
of the bank even if the file content is larger.

Change-Id: I4d75979c7893fdd4d18372fa6b0321a0486b4fa9
Signed-off-by: Marc Schink <[email protected]>
Reviewed-on: http://openocd.zylin.com/3859
Tested-by: jenkins
Reviewed-by: Tomas Vanek <[email protected]>

src/flash/nor/tcl.c

@@ -705,6 +705,7 @@ COMMAND_HANDLER(handle_flash_verify_bank_command)
 	struct fileio *fileio;
 	size_t read_cnt;
 	size_t filesize;
+	size_t length;
 	int differ;
 
 	if (CMD_ARGC < 2 || CMD_ARGC > 3)
@@ -741,35 +742,47 @@ COMMAND_HANDLER(handle_flash_verify_bank_command)
 		return retval;
 	}
 
-	buffer_file = malloc(filesize);
+	length = MIN(filesize, p->size - offset);
+
+	if (!length) {
+		LOG_INFO("Nothing to compare with flash bank");
+		fileio_close(fileio);
+		return ERROR_OK;
+	}
+
+	if (length != filesize)
+		LOG_INFO("File content exceeds flash bank size. Only comparing the "
+			"first %zu bytes of the file", length);
+
+	buffer_file = malloc(length);
 	if (buffer_file == NULL) {
 		LOG_ERROR("Out of memory");
 		fileio_close(fileio);
 		return ERROR_FAIL;
 	}
 
-	retval = fileio_read(fileio, filesize, buffer_file, &read_cnt);
+	retval = fileio_read(fileio, length, buffer_file, &read_cnt);
 	fileio_close(fileio);
 	if (retval != ERROR_OK) {
 		LOG_ERROR("File read failure");
 		free(buffer_file);
 		return retval;
 	}
 
-	if (read_cnt != filesize) {
+	if (read_cnt != length) {
 		LOG_ERROR("Short read");
 		free(buffer_file);
 		return ERROR_FAIL;
 	}
 
-	buffer_flash = malloc(filesize);
+	buffer_flash = malloc(length);
 	if (buffer_flash == NULL) {
 		LOG_ERROR("Out of memory");
 		free(buffer_file);
 		return ERROR_FAIL;
 	}
 
-	retval = flash_driver_read(p, buffer_flash, offset, read_cnt);
+	retval = flash_driver_read(p, buffer_flash, offset, length);
 	if (retval != ERROR_OK) {
 		LOG_ERROR("Flash read error");
 		free(buffer_flash);
@@ -780,15 +793,15 @@ COMMAND_HANDLER(handle_flash_verify_bank_command)
 	if (duration_measure(&bench) == ERROR_OK)
 		command_print(CMD_CTX, "read %zd bytes from file %s and flash bank %u"
 			" at offset 0x%8.8" PRIx32 " in %fs (%0.3f KiB/s)",
-			read_cnt, CMD_ARGV[1], p->bank_number, offset,
-			duration_elapsed(&bench), duration_kbps(&bench, read_cnt));
+			length, CMD_ARGV[1], p->bank_number, offset,
+			duration_elapsed(&bench), duration_kbps(&bench, length));
 
-	differ = memcmp(buffer_file, buffer_flash, read_cnt);
+	differ = memcmp(buffer_file, buffer_flash, length);
 	command_print(CMD_CTX, "contents %s", differ ? "differ" : "match");
 	if (differ) {
 		uint32_t t;
 		int diffs = 0;
-		for (t = 0; t < read_cnt; t++) {
+		for (t = 0; t < length; t++) {
 			if (buffer_flash[t] == buffer_file[t])
 				continue;
 			command_print(CMD_CTX, "diff %d address 0x%08x. Was 0x%02x instead of 0x%02x",