diff --git a/src/camlib.h b/src/camlib.h
index b2e135b..9367ea5 100644
--- a/src/camlib.h
+++ b/src/camlib.h
@@ -247,11 +247,11 @@ int ptp_buffer_resize(struct PtpRuntime *r, size_t size);
 // Packet builder/unpacker helper functions. These accept a pointer-to-pointer
 // and will advance the dereferenced pointer by amount read. Mostly for internal use.
 // These functions accept (void *), but really wants (void **), but (void **) would require casting in every call
-uint8_t ptp_read_uint8(void *dat);
-uint16_t ptp_read_uint16(void *dat);
-uint32_t ptp_read_uint32(void *dat);
-void ptp_write_uint8(void *dat, uint8_t b);
-int ptp_write_uint32(void *dat, uint32_t b);
+//uint8_t ptp_read_uint8(void *dat);
+//uint16_t ptp_read_uint16(void *dat);
+//uint32_t ptp_read_uint32(void *dat);
+//void ptp_write_uint8(void *dat, uint8_t b);
+//int ptp_write_uint32(void *dat, uint32_t b);
 
 int ptp_write_unicode_string(char *dat, char *string);
 int ptp_read_unicode_string(char *buffer, char *dat, int max);
diff --git a/src/cl_data.h b/src/cl_data.h
index d480d41..8ea808e 100644
--- a/src/cl_data.h
+++ b/src/cl_data.h
@@ -230,7 +230,7 @@ int ptp_eos_get_shutter(int data, int dir);
 int ptp_eos_get_iso(int data, int dir);
 int ptp_eos_get_aperture(int data, int dir);
 int ptp_eos_get_white_balance(int data, int dir);
-int ptp_eos_get_imgformat_value(int data[5]);
+int ptp_eos_get_imgformat_value(uint32_t data[5]);
 
 void *ptp_pack_chdk_upload_file(struct PtpRuntime *r, char *in, char *out, int *length);
 
diff --git a/src/conv.c b/src/conv.c
index 1d13835..943acdf 100644
--- a/src/conv.c
+++ b/src/conv.c
@@ -219,7 +219,7 @@ int ptp_eos_get_aperture(int data, int dir) {
 // Converts to camlib wrapper types (enum ImageFormats)
 struct CanonImageFormats {
 	int value;
-	int data[9];
+	uint32_t data[9];
 }canon_imgformats[] = {
 	{IMG_FORMAT_RAW, {1, 16, 6, 0, 4}}, // RAW
 	{IMG_FORMAT_STD, {1, 16, 1, 0, 2}}, // STD
@@ -227,7 +227,7 @@ struct CanonImageFormats {
 	{IMG_FORMAT_RAW_JPEG, {2, 16, 6, 0, 4, 16, 1, 0, 3}}, // RAW + HIGH JPG
 };
 
-int ptp_eos_get_imgformat_value(int data[5]) {
+int ptp_eos_get_imgformat_value(uint32_t data[5]) {
 	for (int i = 0; i < (int)(sizeof(canon_imgformats) / sizeof(struct CanonImageFormats)); i++) {
 		if (!memcmp(canon_imgformats[i].data, data, sizeof(int) * 5)) {
 			return canon_imgformats[i].value;
diff --git a/src/data.c b/src/data.c
index c039fb7..b664753 100644
--- a/src/data.c
+++ b/src/data.c
@@ -243,14 +243,14 @@ void *ptp_pack_chdk_upload_file(struct PtpRuntime *r, char *in, char *out, int *
 
 	int size_all = 4 + strlen(out) + 1 + file_size;
 	*length = size_all;
-	char *data = malloc(size_all);
+	uint8_t *data = malloc(size_all);
 	if (data == NULL) return NULL;
 
-	void *d_ptr = (void *)data;
-	ptp_write_uint32(&d_ptr, strlen(out) + 1);
-	ptp_write_utf8_string(&d_ptr, out);
+	int of = 0;
+	of += ptp_write_u32(data + of, strlen(out) + 1);
+	of += ptp_write_utf8_string(data + of, out);
 
-	fread(d_ptr, 1, file_size, f);
+	fread(data + of, 1, file_size, f);
 
 	return data;
 }
@@ -388,7 +388,7 @@ int ptp_storage_info_json(struct PtpStorageInfo *so, char *buffer, int max) {
 	return len;
 }
 
-int ptp_eos_prop_next(void *d, struct PtpGenericEvent *p) {
+int ptp_eos_prop_next(uint8_t *d, struct PtpGenericEvent *p) {
 	uint32_t code, value, tmp;
 
 	int of = 0;
@@ -417,7 +417,7 @@ int ptp_eos_prop_next(void *d, struct PtpGenericEvent *p) {
 		name = "battery";
 		break;
 	case PTP_PC_EOS_ImageFormat: {
-			int data[5] = {value};
+			uint32_t data[5] = {value};
 			of += ptp_read_u32(d + of, &data[1]);
 			of += ptp_read_u32(d + of, &data[2]);
 			of += ptp_read_u32(d + of, &data[3]);
@@ -519,7 +519,7 @@ int ptp_eos_events(struct PtpRuntime *r, struct PtpGenericEvent **p) {
 		struct PtpGenericEvent *cur = &p_base[i];
 		memset(cur, 0, sizeof(struct PtpGenericEvent));
 
-		void *d = dp;
+		uint8_t *d = dp;
 
 		uint32_t size, type;
 		d += ptp_read_u32(d, &size);
@@ -616,7 +616,7 @@ int ptp_fuji_get_init_info(struct PtpRuntime *r, struct PtpFujiInitResp *resp) {
 	d += ptp_read_u32(d, &resp->x3);
 	d += ptp_read_u32(d, &resp->x4);
 
-	ptp_read_unicode_string(resp->cam_name, (char *)(dat), sizeof(resp->cam_name));
+	ptp_read_unicode_string(resp->cam_name, (char *)d, sizeof(resp->cam_name));
 
 	return 0;
 }
diff --git a/src/packet.c b/src/packet.c
index c59f34c..373835d 100644
--- a/src/packet.c
+++ b/src/packet.c
@@ -9,34 +9,34 @@
 #include <ptp.h>
 #include <camlib.h>
 
-uint8_t ptp_read_uint8(void *dat) {
+static uint8_t ptp_read_uint8(void *dat) {
 	uint8_t **p = (uint8_t **)dat;
 	uint8_t x = (**p);
 	(*p)++;
 	return x;
 }
 
-uint16_t ptp_read_uint16(void *dat) {
+static uint16_t ptp_read_uint16(void *dat) {
 	uint16_t **p = (uint16_t **)dat;
 	uint16_t x = (**p);
 	(*p)++;
 	return x;
 }
 
-uint32_t ptp_read_uint32(void *dat) {
+static uint32_t ptp_read_uint32(void *dat) {
 	uint32_t **p = (uint32_t **)dat;
 	uint32_t x = (**p);
 	(*p)++;
 	return x;
 }
 
-void ptp_write_uint8(void *dat, uint8_t b) {
+static void ptp_write_uint8(void *dat, uint8_t b) {
 	uint8_t **ptr = (uint8_t **)dat;
 	(**ptr) = b;
 	(*ptr)++;
 }
 
-int ptp_write_uint32(void *dat, uint32_t b) {
+static int ptp_write_uint32(void *dat, uint32_t b) {
 	uint32_t **ptr = (uint32_t **)dat;
 	(**ptr) = b;
 	(*ptr)++;