core: convert ostctools as C++

Replace some of the memory management by C++ idioms.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

Subsurface-mobile.pro

@@ -81,7 +81,7 @@ SOURCES += subsurface-mobile-main.cpp \
 	core/version.cpp \
 	core/save-git.cpp \
 	core/datatrak.cpp \
-	core/ostctools.c \
+	core/ostctools.cpp \
 	core/planner.cpp \
 	core/save-xml.cpp \
 	core/cochran.cpp \

core/CMakeLists.txt

@@ -131,7 +131,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
 	metadata.h
 	metrics.cpp
 	metrics.h
-	ostctools.c
+	ostctools.cpp
 	owning_ptrs.h
 	parse-gpx.cpp
 	parse-xml.cpp

core/libdivecomputer.h

@@ -31,24 +31,24 @@ struct divelog;
 struct devices;
 
 typedef struct {
-	dc_descriptor_t *descriptor;
-	const char *vendor, *product, *devname;
-	const char *model, *btname;
-	unsigned char *fingerprint;
-	unsigned int fsize, fdeviceid, fdiveid;
-	struct dc_event_devinfo_t devinfo;
-	uint32_t diveid;
-	dc_device_t *device;
-	dc_context_t *context;
-	dc_iostream_t *iostream;
-	bool force_download;
-	bool libdc_log;
-	bool libdc_dump;
-	bool bluetooth_mode;
-	bool sync_time;
-	FILE *libdc_logfile;
-	struct divelog *log;
-	void *androidUsbDeviceDescriptor;
+	dc_descriptor_t *descriptor = nullptr;
+	const char *vendor = nullptr, *product = nullptr, *devname = nullptr;
+	const char *model = nullptr, *btname = nullptr;
+	unsigned char *fingerprint = nullptr;
+	unsigned int fsize = 0, fdeviceid = 0, fdiveid = 0;
+	struct dc_event_devinfo_t devinfo = { };
+	uint32_t diveid = 0;
+	dc_device_t *device = nullptr;
+	dc_context_t *context = nullptr;
+	dc_iostream_t *iostream = nullptr;
+	bool force_download = false;
+	bool libdc_log = false;
+	bool libdc_dump = false;
+	bool bluetooth_mode = false;
+	bool sync_time = false;
+	FILE *libdc_logfile = nullptr;
+	struct divelog *log = nullptr;
+	void *androidUsbDeviceDescriptor = nullptr;
 } device_data_t;
 
 const char *errmsg (dc_status_t rc);

core/ostctools.cpp

@@ -12,23 +12,25 @@
 #include "divelog.h"
 #include "extradata.h"
 #include "file.h"
+#include "format.h"
 #include "libdivecomputer.h"
+#include "owning_ptrs.h"
 
 /*
  * Fills a device_data_t structure with known dc data and a descriptor.
  */
-static int ostc_prepare_data(int data_model, dc_family_t dc_fam, device_data_t *dev_data)
+static int ostc_prepare_data(int data_model, dc_family_t dc_fam, device_data_t &dev_data)
 {
 	dc_descriptor_t *data_descriptor;
 
-	dev_data->device = NULL;
-	dev_data->context = NULL;
+	dev_data.device = NULL;
+	dev_data.context = NULL;
 
 	data_descriptor = get_descriptor(dc_fam, data_model);
 	if (data_descriptor) {
-		dev_data->descriptor = data_descriptor;
-		dev_data->vendor = copy_string(dc_descriptor_get_vendor(data_descriptor));
-		dev_data->model = copy_string(dc_descriptor_get_product(data_descriptor));
+		dev_data.descriptor = data_descriptor;
+		dev_data.vendor = copy_string(dc_descriptor_get_vendor(data_descriptor));
+		dev_data.model = copy_string(dc_descriptor_get_product(data_descriptor));
 	} else {
 		return 0;
 	}
@@ -40,16 +42,15 @@ static int ostc_prepare_data(int data_model, dc_family_t dc_fam, device_data_t *
  * each file. So it's not necessary to iterate once and again on a parsing
  * function. Actually there's only one kind of archive for every DC model.
  */
-void ostctools_import(const char *file, struct divelog *log)
+extern "C" void ostctools_import(const char *file, struct divelog *log)
 {
 	FILE *archive;
-	device_data_t *devdata = calloc(1, sizeof(device_data_t));
+	device_data_t devdata;
 	dc_family_t dc_fam;
-	unsigned char *buffer = calloc(65536, 1);
+	std::vector<unsigned char> buffer(65536, 0);
 	unsigned char uc_tmp[2];
-	char *tmp;
-	struct dive *ostcdive = alloc_dive();
-	dc_status_t rc = 0;
+	OwningDivePtr ostcdive(alloc_dive());
+	dc_status_t rc = DC_STATUS_SUCCESS;
 	int model, ret, i = 0, c;
 	unsigned int serial;
 	struct extra_data *ptr;
@@ -58,41 +59,40 @@ void ostctools_import(const char *file, struct divelog *log)
 	// Open the archive
 	if ((archive = subsurface_fopen(file, "rb")) == NULL) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto out;
+		return;
 	}
 
 	// Read dive number from the log
 	if (fseek(archive, 258, 0) == -1) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
 	if (fread(uc_tmp, 1, 2, archive) != 2) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
 	ostcdive->number = uc_tmp[0] + (uc_tmp[1] << 8);
 
 	// Read device's serial number
 	if (fseek(archive, 265, 0) == -1) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
 	if (fread(uc_tmp, 1, 2, archive) != 2) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
 	serial = uc_tmp[0] + (uc_tmp[1] << 8);
 
 	// Read dive's raw data, header + profile
 	if (fseek(archive, 456, 0) == -1) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
 	while ((c = getc(archive)) != EOF) {
 		buffer[i] = c;
@@ -102,9 +102,10 @@ void ostctools_import(const char *file, struct divelog *log)
 	}
 	if (ferror(archive)) {
 		report_error(failed_to_read_msg, file);
-		free_dive(ostcdive);
-		goto close_out;
+		fclose(archive);
+		return;
 	}
+	fclose(archive);
 
 	// Try to determine the dc family based on the header type
 	if (buffer[2] == 0x20 || buffer[2] == 0x21) {
@@ -120,8 +121,7 @@ void ostctools_import(const char *file, struct divelog *log)
 			break;
 		default:
 			report_error(translate("gettextFromC", "Unknown DC in dive %d"), ostcdive->number);
-			free_dive(ostcdive);
-			goto close_out;
+			return;
 		}
 	}
 
@@ -151,26 +151,20 @@ void ostctools_import(const char *file, struct divelog *log)
 	ret = ostc_prepare_data(model, dc_fam, devdata);
 	if (ret == 0) {
 		report_error(translate("gettextFromC", "Unknown DC in dive %d"), ostcdive->number);
-		free_dive(ostcdive);
-		goto close_out;
+		return;
 	}
-	tmp = calloc(strlen(devdata->vendor) + strlen(devdata->model) + 28, 1);
-	sprintf(tmp, "%s %s (Imported from OSTCTools)", devdata->vendor, devdata->model);
-	ostcdive->dc.model = copy_string(tmp);
-	free(tmp);
+	std::string tmp = format_string_std("%s %s (Imported from OSTCTools)", devdata.vendor, devdata.model);
+	ostcdive->dc.model = copy_string(tmp.c_str());
 
 	// Parse the dive data
-	rc = libdc_buffer_parser(ostcdive, devdata, buffer, i + 1);
+	rc = libdc_buffer_parser(ostcdive.get(), &devdata, buffer.data(), i + 1);
 	if (rc != DC_STATUS_SUCCESS)
 		report_error(translate("gettextFromC", "Error - %s - parsing dive %d"), errmsg(rc), ostcdive->number);
 
 	// Serial number is not part of the header nor the profile, so libdc won't
 	// catch it. If Serial is part of the extra_data, and set to zero, remove
 	// it from the list and add again.
-	tmp = calloc(12, 1);
-	sprintf(tmp, "%d", serial);
-	ostcdive->dc.serial = copy_string(tmp);
-	free(tmp);
+	ostcdive->dc.serial = copy_string(std::to_string(serial).c_str());
 
 	if (ostcdive->dc.extra_data) {
 		ptr = ostcdive->dc.extra_data;
@@ -183,12 +177,6 @@ void ostctools_import(const char *file, struct divelog *log)
 	} else {
 		add_extra_data(&ostcdive->dc, "Serial", ostcdive->dc.serial);
 	}
-	record_dive_to_table(ostcdive, log->dives);
+	record_dive_to_table(ostcdive.release(), log->dives);
 	sort_dive_table(log->dives);
-
-close_out:
-	fclose(archive);
-out:
-	free(devdata);
-	free(buffer);
 }