diff --git a/lib/libarchive/archive_read_support_compression_bzip2.c b/lib/libarchive/archive_read_support_compression_bzip2.c
index 9feb93585214..71fd4bb69aed 100644
--- a/lib/libarchive/archive_read_support_compression_bzip2.c
+++ b/lib/libarchive/archive_read_support_compression_bzip2.c
@@ -253,10 +253,10 @@ static ssize_t
 read_ahead(struct archive_read *a, const void **p, size_t min)
 {
 	struct private_data *state;
-	int read_avail, was_avail, ret;
+	size_t read_avail, was_avail;
+	int ret;
 
 	state = (struct private_data *)a->compression_data;
-	was_avail = -1;
 	if (!a->client_reader) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
 		    "No read callback is registered?  "
@@ -275,13 +275,14 @@ read_ahead(struct archive_read *a, const void **p, size_t min)
 		    = state->uncompressed_buffer_size - read_avail;
 	}
 
-	while (was_avail < read_avail &&	/* Made some progress. */
-	    read_avail < (int)min &&		/* Haven't satisfied min. */
-	    read_avail < (int)state->uncompressed_buffer_size) { /* !full */
+	while (read_avail < min &&		/* Haven't satisfied min. */
+	    read_avail < state->uncompressed_buffer_size) { /* !full */
+		was_avail = read_avail;
 		if ((ret = drive_decompressor(a, state)) != ARCHIVE_OK)
 			return (ret);
-		was_avail = read_avail;
 		read_avail = state->stream.next_out - state->read_next;
+		if (was_avail == read_avail) /* No progress? */
+			break;
 	}
 
 	*p = state->read_next;
@@ -346,12 +347,15 @@ drive_decompressor(struct archive_read *a, struct private_data *state)
 	ssize_t ret;
 	int decompressed, total_decompressed;
 	char *output;
+	const void *read_buf;
 
 	total_decompressed = 0;
 	for (;;) {
 		if (state->stream.avail_in == 0) {
+			read_buf = state->stream.next_in;
 			ret = (a->client_reader)(&a->archive, a->client_data,
-			    (const void **)&state->stream.next_in);
+			    &read_buf);
+			state->stream.next_in = (void *)(uintptr_t)read_buf;
 			if (ret < 0) {
 				/*
 				 * TODO: Find a better way to handle
diff --git a/lib/libarchive/archive_read_support_compression_compress.c b/lib/libarchive/archive_read_support_compression_compress.c
index 51590994bbb1..9bd17650dee4 100644
--- a/lib/libarchive/archive_read_support_compression_compress.c
+++ b/lib/libarchive/archive_read_support_compression_compress.c
@@ -275,10 +275,10 @@ static ssize_t
 read_ahead(struct archive_read *a, const void **p, size_t min)
 {
 	struct private_data *state;
-	int read_avail, was_avail, ret;
+	size_t read_avail;
+	int ret;
 
 	state = (struct private_data *)a->compression_data;
-	was_avail = -1;
 	if (!a->client_reader) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
 		    "No read callback is registered?  "
@@ -288,14 +288,14 @@ read_ahead(struct archive_read *a, const void **p, size_t min)
 
 	read_avail = state->next_out - state->read_next;
 
-	if (read_avail < (int)min  &&  state->end_of_stream) {
+	if (read_avail < min  &&  state->end_of_stream) {
 		if (state->end_of_stream == ARCHIVE_EOF)
 			return (0);
 		else
 			return (-1);
 	}
 
-	if (read_avail < (int)min) {
+	if (read_avail < min) {
 		memmove(state->uncompressed_buffer, state->read_next,
 		    read_avail);
 		state->read_next = (unsigned char *)state->uncompressed_buffer;
@@ -303,7 +303,7 @@ read_ahead(struct archive_read *a, const void **p, size_t min)
 		state->avail_out
 		    = state->uncompressed_buffer_size - read_avail;
 
-		while (read_avail < (int)state->uncompressed_buffer_size
+		while (read_avail < state->uncompressed_buffer_size
 			&& !state->end_of_stream) {
 			if (state->stackp > state->stack) {
 				*state->next_out++ = *--state->stackp;
@@ -465,12 +465,14 @@ getbits(struct archive_read *a, struct private_data *state, int n)
 		0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
 		0x1ff, 0x3ff, 0x7ff, 0xfff, 0x1fff, 0x3fff, 0x7fff, 0xffff
 	};
-
+	const void *read_buf;
 
 	while (state->bits_avail < n) {
 		if (state->avail_in <= 0) {
+			read_buf = state->next_in;
 			ret = (a->client_reader)(&a->archive, a->client_data,
-			    (const void **)&state->next_in);
+			    &read_buf);
+			state->next_in = read_buf;
 			if (ret < 0)
 				return (ARCHIVE_FATAL);
 			if (ret == 0)
diff --git a/lib/libarchive/archive_read_support_compression_gzip.c b/lib/libarchive/archive_read_support_compression_gzip.c
index 49e209daddc6..751fffc8cfc8 100644
--- a/lib/libarchive/archive_read_support_compression_gzip.c
+++ b/lib/libarchive/archive_read_support_compression_gzip.c
@@ -258,10 +258,10 @@ static ssize_t
 read_ahead(struct archive_read *a, const void **p, size_t min)
 {
 	struct private_data *state;
-	int read_avail, was_avail, ret;
+	size_t read_avail, was_avail;
+	int ret;
 
 	state = (struct private_data *)a->compression_data;
-	was_avail = -1;
 	if (!a->client_reader) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
 		    "No read callback is registered?  "
@@ -280,13 +280,14 @@ read_ahead(struct archive_read *a, const void **p, size_t min)
 		    = state->uncompressed_buffer_size - read_avail;
 	}
 
-	while (was_avail < read_avail &&	/* Made some progress. */
-	    read_avail < (int)min &&		/* Haven't satisfied min. */
-	    read_avail < (int)state->uncompressed_buffer_size) { /* !full */
+	while (read_avail < min &&		/* Haven't satisfied min. */
+	    read_avail < state->uncompressed_buffer_size) { /* !full */
+		was_avail = read_avail;
 		if ((ret = drive_decompressor(a, state)) != ARCHIVE_OK)
 			return (ret);
-		was_avail = read_avail;
 		read_avail = state->stream.next_out - state->read_next;
+		if (was_avail == read_avail) /* No progress? */
+			break;
 	}
 
 	*p = state->read_next;
@@ -349,10 +350,11 @@ static int
 drive_decompressor(struct archive_read *a, struct private_data *state)
 {
 	ssize_t ret;
-	int decompressed, total_decompressed;
+	size_t decompressed, total_decompressed;
 	int count, flags, header_state;
 	unsigned char *output;
 	unsigned char b;
+	const void *read_buf;
 
 	flags = 0;
 	count = 0;
@@ -360,8 +362,10 @@ drive_decompressor(struct archive_read *a, struct private_data *state)
 	total_decompressed = 0;
 	for (;;) {
 		if (state->stream.avail_in == 0) {
+			read_buf = state->stream.next_in;
 			ret = (a->client_reader)(&a->archive, a->client_data,
-			    (const void **)&state->stream.next_in);
+			    &read_buf);
+			state->stream.next_in = (unsigned char *)(uintptr_t)read_buf;
 			if (ret < 0) {
 				/*
 				 * TODO: Find a better way to handle
diff --git a/lib/libarchive/archive_read_support_compression_none.c b/lib/libarchive/archive_read_support_compression_none.c
index 72328a37e050..1c8c6e3b3451 100644
--- a/lib/libarchive/archive_read_support_compression_none.c
+++ b/lib/libarchive/archive_read_support_compression_none.c
@@ -51,7 +51,7 @@ struct archive_decompress_none {
 	size_t		 buffer_size;
 	char		*next;		/* Current read location. */
 	size_t		 avail;		/* Bytes in my buffer. */
-	const char	*client_buff;	/* Client buffer information. */
+	const void	*client_buff;	/* Client buffer information. */
 	size_t		 client_total;
 	const char	*client_next;
 	size_t		 client_avail;
@@ -130,7 +130,7 @@ archive_decompressor_none_init(struct archive_read *a, const void *buff, size_t
 	}
 
 	/* Save reference to first block of data. */
-	state->client_buff = (const char *)buff;
+	state->client_buff = buff;
 	state->client_total = n;
 	state->client_next = state->client_buff;
 	state->client_avail = state->client_total;
@@ -219,8 +219,7 @@ archive_decompressor_none_read_ahead(struct archive_read *a, const void **buff,
 			 * aren't, hence the cast.
 			 */
 			bytes_read = (a->client_reader)(&a->archive,
-			    a->client_data,
-			    (const void **)&state->client_buff);
+			    a->client_data, &state->client_buff);
 			if (bytes_read < 0) {		/* Read error. */
 				state->client_total = state->client_avail = 0;
 				state->client_next = state->client_buff = NULL;