Add new PascalStringArray type

0.go

@@ -29,7 +29,7 @@ func getPascalStringFromBytes(goBytes []byte) C.PascalString {
 
 // getCPascalStringArrayFromStringSlice converts a Go slice
 // of strings to a C array of pascal strings.
-func getCPascalStringArrayFromStringSlice(goSlice []string) *C.PascalString {
+func getCPascalStringArrayFromStringSlice(goSlice []string) C.PascalStringArray {
 	// allocate C array for PascalStrings
 	cArrPtr := (*C.PascalString)(C.malloc(C.size_t(len(goSlice)) * C.size_t(C.sizeof_PascalString)))
 
@@ -39,7 +39,7 @@ func getCPascalStringArrayFromStringSlice(goSlice []string) *C.PascalString {
 		cArr[i] = getPascalString(goSlice[i])
 	}
 
-	return cArrPtr
+	return C.PascalStringArray{data: cArrPtr, len: C.int(len(goSlice))}
 }
 
 // GetPascalStringFromCString is a helper meant to be used from C.
@@ -55,12 +55,12 @@ func GetPascalStringFromCString(cString *C.char) C.PascalString {
 // FreeArray frees the memory allocated by a C-allocated array.
 //
 //export FreeArray
-func FreeArray(items *C.PascalString, count C.int) {
-	linesSlice := (*[1 << 30]C.PascalString)(unsafe.Pointer(items))[:count:count]
-	for i := 0; i < int(count); i++ {
+func FreeArray(array C.PascalStringArray) {
+	linesSlice := (*[1 << 30]C.PascalString)(unsafe.Pointer(array.data))[:array.len:array.len]
+	for i := 0; i < int(array.len); i++ {
 		C.free(unsafe.Pointer(linesSlice[i].data))
 	}
-	C.free(unsafe.Pointer(items))
+	C.free(unsafe.Pointer(array.data))
 }
 
 // safeStringDeref safely dereferences a string pointer, returning empty string if nil.

README.md

@@ -53,13 +53,13 @@ int main() {
         exit(1); // result.r0 not freed since program exits
     }
 
-    for (int i = 0; i < result.r2; i++) {
+    for (int i = 0; i < result.r1.len; i++) {
         // print Pascal string using "%.*s" with printf and supplying both length and data
-        printf("%.*s\n", result.r1[i].len, result.r1[i].data);
+        printf("%.*s\n", result.r1.data[i].len, result.r1.data[i].data);
     }
 
     // be sure to free the data!
-    FreeArray(result.r1, result.r2);
+    FreeArray(result.r1);
 }
 ```
 

crypt.go

@@ -11,22 +11,20 @@ import (
 // DecryptFileToSlice returns:
 // r0: err
 //
-// r1: decLines (pointer to C-allocated array)
-//
-// r2: decLines length
+// r1: decLines
 //
 //export DecryptFileToSlice
-func DecryptFileToSlice(realPath, rcwPassword C.PascalString) (*C.char, *C.PascalString, C.int) {
+func DecryptFileToSlice(realPath, rcwPassword C.PascalString) (*C.char, C.PascalStringArray) {
 	lines, err := crypt.DecryptFileToSlice(C.GoStringN(realPath.data, realPath.len), []byte(C.GoStringN(rcwPassword.data, rcwPassword.len)))
 	if err != nil {
-		return C.CString(err.Error()), nil, 0
+		return C.CString(err.Error()), C.PascalStringArray{}
 	}
 
 	if len(lines) == 0 {
-		return nil, nil, 0
+		return nil, C.PascalStringArray{}
 	}
 
-	return nil, getCPascalStringArrayFromStringSlice(lines), C.int(len(lines))
+	return nil, getCPascalStringArrayFromStringSlice(lines)
 }
 
 // EncryptBytes returns:

syncclient.go

@@ -68,23 +68,17 @@ func GenDeviceID(oldDeviceID, prefix C.PascalString) (*C.char, C.PascalString, C
 // RunJob returns:
 // r0: err
 //
-// r1: deleteList (pointer to C-allocated array)
+// r1: deleteList
 //
-// r2: deleteList length
+// r2: downloadList
 //
-// r3: downloadList (pointer to C-allocated array)
-//
-// r4: downloadList length
-//
-// r5: uploadList (pointer to C-allocated array)
-//
-// r6: uploadList length
+// r3: uploadList
 //
 //export RunJob
-func RunJob() (*C.char, *C.PascalString, C.int, *C.PascalString, C.int, *C.PascalString, C.int) {
+func RunJob() (*C.char, C.PascalStringArray, C.PascalStringArray, C.PascalStringArray) {
 	lists, err := syncclient.RunJob()
 	if err != nil {
-		return C.CString(err.Error()), nil, 0, nil, 0, nil, 0
+		return C.CString(err.Error()), C.PascalStringArray{}, C.PascalStringArray{}, C.PascalStringArray{}
 	}
-	return nil, getCPascalStringArrayFromStringSlice(lists.Delete), C.int(len(lists.Delete)), getCPascalStringArrayFromStringSlice(lists.Download), C.int(len(lists.Download)), getCPascalStringArrayFromStringSlice(lists.Upload), C.int(len(lists.Upload))
+	return nil, getCPascalStringArrayFromStringSlice(lists.Delete), getCPascalStringArrayFromStringSlice(lists.Download), getCPascalStringArrayFromStringSlice(lists.Upload)
 }

synccommon.go

@@ -13,39 +13,33 @@ import (
 // WalkEntryDir returns:
 // r0: err
 //
-// r1: files (pointer to C-allocated array)
+// r1: files
 //
-// r2: files length
-//
-// r3: dirs (pointer to C-allocated array)
-//
-// r4: dirs length
+// r2: dirs
 //
 //export WalkEntryDir
-func WalkEntryDir() (*C.char, *C.PascalString, C.int, *C.PascalString, C.int) {
+func WalkEntryDir() (*C.char, C.PascalStringArray, C.PascalStringArray) {
 	files, dirs, err := synccommon.WalkEntryDir()
 	if err != nil {
-		return C.CString(err.Error()), nil, 0, nil, 0
+		return C.CString(err.Error()), C.PascalStringArray{}, C.PascalStringArray{}
 	}
-	return nil, getCPascalStringArrayFromStringSlice(files), C.int(len(files)), getCPascalStringArrayFromStringSlice(dirs), C.int(len(dirs))
+	return nil, getCPascalStringArrayFromStringSlice(files), getCPascalStringArrayFromStringSlice(dirs)
 }
 
 // GetAllEntryData returns:
 // r0: err
 //
-// r1: vanityPaths (pointer to C-allocated array)
+// r1: vanityPaths
 //
-// r2: vanityPaths length
+// r2: translatedAges (pointer to C-allocated array)
 //
-// r3: translatedAges (pointer to C-allocated array)
-//
-// r4: translatedAges length
+// r3: translatedAges length
 //
 //export GetAllEntryData
-func GetAllEntryData() (*C.char, *C.PascalString, C.int, *uint8, C.int) {
+func GetAllEntryData() (*C.char, C.PascalStringArray, *uint8, C.int) {
 	entryMap, err := synccommon.GetAllEntryData()
 	if err != nil {
-		return C.CString(err.Error()), nil, 0, nil, 0
+		return C.CString(err.Error()), C.PascalStringArray{}, nil, 0
 	}
 	var vanityPaths []string
 	var translatedAges []uint8
@@ -53,5 +47,5 @@ func GetAllEntryData() (*C.char, *C.PascalString, C.int, *uint8, C.int) {
 		vanityPaths = append(vanityPaths, k)
 		translatedAges = append(translatedAges, age.TranslateAgeTimestamp(v.AgeTimestamp))
 	}
-	return nil, getCPascalStringArrayFromStringSlice(vanityPaths), C.int(len(vanityPaths)), (*uint8)(unsafe.Pointer(&translatedAges[0])), C.int(len(translatedAges))
+	return nil, getCPascalStringArrayFromStringSlice(vanityPaths), (*uint8)(unsafe.Pointer(&translatedAges[0])), C.int(len(translatedAges))
 }

types.h

@@ -6,4 +6,9 @@ typedef struct {
     int len;
 } PascalString;
 
+typedef struct {
+    PascalString* data;
+    int len;
+} PascalStringArray;
+
 #endif