VFS: Add sync method to force syncing with backing

CHANGES

@@ -98,6 +98,7 @@ Misc:
  - GBA Hardware: Backport generic RTC source into core
  - All: Proper handling of Unicode file paths
  - GBA Video: Slightly optimize mode 0 mosaic rendering
+ - VFS: Add sync method to force syncing with backing
 
 0.2.1: (2015-05-13)
 Bugfixes:

src/util/vfs.h

@@ -39,6 +39,7 @@ struct VFile {
 	void (*unmap)(struct VFile* vf, void* memory, size_t size);
 	void (*truncate)(struct VFile* vf, size_t size);
 	ssize_t (*size)(struct VFile* vf);
+	bool (*sync)(struct VFile* vf, const void* buffer, size_t size);
 };
 
 struct VDirEntry {

src/util/vfs/vfs-fd.c

@@ -30,6 +30,7 @@ static void* _vfdMap(struct VFile* vf, size_t size, int flags);
 static void _vfdUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfdTruncate(struct VFile* vf, size_t size);
 static ssize_t _vfdSize(struct VFile* vf);
+static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size);
 
 struct VFile* VFileOpenFD(const char* path, int flags) {
 	if (!path) {
@@ -66,6 +67,7 @@ struct VFile* VFileFromFD(int fd) {
 	vfd->d.unmap = _vfdUnmap;
 	vfd->d.truncate = _vfdTruncate;
 	vfd->d.size = _vfdSize;
+	vfd->d.sync = _vfdSync;
 
 	return &vfd->d;
 }
@@ -166,3 +168,10 @@ static ssize_t _vfdSize(struct VFile* vf) {
 	}
 	return stat.st_size;
 }
+
+static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size) {
+	UNUSED(buffer);
+	UNUSED(size);
+	struct VFileFD* vfd = (struct VFileFD*) vf;
+	return fsync(vfd->fd) == 0;
+}

src/util/vfs/vfs-file.c

@@ -24,6 +24,7 @@ static void* _vffMap(struct VFile* vf, size_t size, int flags);
 static void _vffUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vffTruncate(struct VFile* vf, size_t size);
 static ssize_t _vffSize(struct VFile* vf);
+static bool _vffSync(struct VFile* vf, const void* buffer, size_t size);
 
 struct VFile* VFileFOpen(const char* path, const char* mode) {
 	if (!path && !mode) {
@@ -57,6 +58,7 @@ struct VFile* VFileFromFILE(FILE* file) {
 	vff->d.unmap = _vffUnmap;
 	vff->d.truncate = _vffTruncate;
 	vff->d.size = _vffSize;
+	vff->d.sync = _vffSync;
 
 	return &vff->d;
 }
@@ -140,3 +142,14 @@ static ssize_t _vffSize(struct VFile* vf) {
 	fseek(vff->file, pos, SEEK_SET);
 	return size;
 }
+
+static bool _vffSync(struct VFile* vf, const void* buffer, size_t size) {
+	struct VFileFILE* vff = (struct VFileFILE*) vf;
+	if (buffer && size) {
+		long pos = ftell(vff->file);
+		fseek(vff->file, 0, SEEK_SET);
+		fwrite(buffer, size, 1, vff->file);
+		fseek(vff->file, pos, SEEK_SET);
+	}
+	return fflush(vff->file) == 0;
+}

src/util/vfs/vfs-lzma.c

@@ -56,6 +56,7 @@ static void* _vf7zMap(struct VFile* vf, size_t size, int flags);
 static void _vf7zUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vf7zTruncate(struct VFile* vf, size_t size);
 static ssize_t _vf7zSize(struct VFile* vf);
+static bool _vf7zSync(struct VFile* vf, const void* buffer, size_t size);
 
 static bool _vd7zClose(struct VDir* vd);
 static void _vd7zRewind(struct VDir* vd);
@@ -291,6 +292,7 @@ struct VFile* _vd7zOpenFile(struct VDir* vd, const char* path, int mode) {
 	vf->d.unmap = _vf7zUnmap;
 	vf->d.truncate = _vf7zTruncate;
 	vf->d.size = _vf7zSize;
+	vf->d.sync = _vf7zSync;
 
 	return &vf->d;
 }
@@ -308,4 +310,11 @@ const char* _vde7zName(struct VDirEntry* vde) {
 	return vde7z->utf8;
 }
 
+bool _vf7zSync(struct VFile* vf, const void* memory, size_t size) {
+	UNUSED(vf);
+	UNUSED(memory);
+	UNUSED(size);
+	return false;
+}
+
 #endif

src/util/vfs/vfs-zip.c

@@ -43,6 +43,7 @@ static void* _vfzMap(struct VFile* vf, size_t size, int flags);
 static void _vfzUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfzTruncate(struct VFile* vf, size_t size);
 static ssize_t _vfzSize(struct VFile* vf);
+static bool _vfzSync(struct VFile* vf, const void* buffer, size_t size);
 
 static bool _vdzClose(struct VDir* vd);
 static void _vdzRewind(struct VDir* vd);
@@ -289,6 +290,7 @@ struct VFile* _vdzOpenFile(struct VDir* vd, const char* path, int mode) {
 	vfz->d.unmap = _vfzUnmap;
 	vfz->d.truncate = _vfzTruncate;
 	vfz->d.size = _vfzSize;
+	vfz->d.sync = _vfzSync;
 
 	return &vfz->d;
 }
@@ -302,4 +304,11 @@ const char* _vdezName(struct VDirEntry* vde) {
 	return s.name;
 }
 
+bool _vfzSync(struct VFile* vf, const void* memory, size_t size) {
+	UNUSED(vf);
+	UNUSED(memory);
+	UNUSED(size);
+	return false;
+}
+
 #endif