ewah: drop ewah_deserialize function

peff · gitster · commit caa88140d4cc · 2018-06-18T10:16:19.000-07:00
We don't call this function, and in fact never have since it
was added (at least not in iterations of the ewah patches
that got merged). Instead we use ewah_read_mmap().

Let's drop the unused code.

Note to anybody who later wants to resurrect this: it does
not check for integer overflow in the ewah data size,
meaning it may be possible to convince the code to allocate
a too-small buffer and read() into it.

Signed-off-by: Jeff King &lt;peff@peff.net&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/ewah/ewah_io.c b/ewah/ewah_io.c
@@ -158,58 +158,3 @@ ssize_t ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
 
 	return ptr - (const uint8_t *)map;
 }
-
-int ewah_deserialize(struct ewah_bitmap *self, int fd)
-{
-	size_t i;
-	eword_t dump[2048];
-	const size_t words_per_dump = sizeof(dump) / sizeof(eword_t);
-	uint32_t bitsize, word_count, rlw_pos;
-
-	eword_t *buffer = NULL;
-	size_t words_left;
-
-	ewah_clear(self);
-
-	/* 32 bit -- bit size for the map */
-	if (read(fd, &bitsize, 4) != 4)
-		return -1;
-
-	self->bit_size = (size_t)ntohl(bitsize);
-
-	/** 32 bit -- number of compressed 64-bit words */
-	if (read(fd, &word_count, 4) != 4)
-		return -1;
-
-	self->buffer_size = self->alloc_size = (size_t)ntohl(word_count);
-	REALLOC_ARRAY(self->buffer, self->alloc_size);
-
-	/** 64 bit x N -- compressed words */
-	buffer = self->buffer;
-	words_left = self->buffer_size;
-
-	while (words_left >= words_per_dump) {
-		if (read(fd, dump, sizeof(dump)) != sizeof(dump))
-			return -1;
-
-		for (i = 0; i < words_per_dump; ++i, ++buffer)
-			*buffer = ntohll(dump[i]);
-
-		words_left -= words_per_dump;
-	}
-
-	if (words_left) {
-		if (read(fd, dump, words_left * 8) != words_left * 8)
-			return -1;
-
-		for (i = 0; i < words_left; ++i, ++buffer)
-			*buffer = ntohll(dump[i]);
-	}
-
-	/** 32 bit -- position for the RLW */
-	if (read(fd, &rlw_pos, 4) != 4)
-		return -1;
-
-	self->rlw = self->buffer + ntohl(rlw_pos);
-	return 0;
-}
diff --git a/ewah/ewok.h b/ewah/ewok.h
@@ -89,7 +89,6 @@ int ewah_serialize_to(struct ewah_bitmap *self,
 int ewah_serialize_native(struct ewah_bitmap *self, int fd);
 int ewah_serialize_strbuf(struct ewah_bitmap *self, struct strbuf *);
 
-int ewah_deserialize(struct ewah_bitmap *self, int fd);
 ssize_t ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len);
 
 uint32_t ewah_checksum(struct ewah_bitmap *self);
