summaryrefslogtreecommitdiff
path: root/ewah/ewah_io.c
diff options
context:
space:
mode:
Diffstat (limited to 'ewah/ewah_io.c')
-rw-r--r--ewah/ewah_io.c116
1 files changed, 21 insertions, 95 deletions
diff --git a/ewah/ewah_io.c b/ewah/ewah_io.c
index bed1994551..9035ee65ea 100644
--- a/ewah/ewah_io.c
+++ b/ewah/ewah_io.c
@@ -20,32 +20,6 @@
#include "ewok.h"
#include "strbuf.h"
-int ewah_serialize_native(struct ewah_bitmap *self, int fd)
-{
- uint32_t write32;
- size_t to_write = self->buffer_size * 8;
-
- /* 32 bit -- bit size for the map */
- write32 = (uint32_t)self->bit_size;
- if (write(fd, &write32, 4) != 4)
- return -1;
-
- /** 32 bit -- number of compressed 64-bit words */
- write32 = (uint32_t)self->buffer_size;
- if (write(fd, &write32, 4) != 4)
- return -1;
-
- if (write(fd, self->buffer, to_write) != to_write)
- return -1;
-
- /** 32 bit -- position for the RLW */
- write32 = self->rlw - self->buffer;
- if (write(fd, &write32, 4) != 4)
- return -1;
-
- return (3 * 4) + to_write;
-}
-
int ewah_serialize_to(struct ewah_bitmap *self,
int (*write_fun)(void *, const void *, size_t),
void *data)
@@ -100,16 +74,6 @@ int ewah_serialize_to(struct ewah_bitmap *self,
return (3 * 4) + (self->buffer_size * 8);
}
-static int write_helper(void *fd, const void *buf, size_t len)
-{
- return write((intptr_t)fd, buf, len);
-}
-
-int ewah_serialize(struct ewah_bitmap *self, int fd)
-{
- return ewah_serialize_to(self, write_helper, (void *)(intptr_t)fd);
-}
-
static int write_strbuf(void *user_data, const void *data, size_t len)
{
struct strbuf *sb = user_data;
@@ -122,16 +86,23 @@ int ewah_serialize_strbuf(struct ewah_bitmap *self, struct strbuf *sb)
return ewah_serialize_to(self, write_strbuf, sb);
}
-int ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
+ssize_t ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
{
const uint8_t *ptr = map;
+ size_t data_len;
size_t i;
+ if (len < sizeof(uint32_t))
+ return error("corrupt ewah bitmap: eof before bit size");
self->bit_size = get_be32(ptr);
ptr += sizeof(uint32_t);
+ len -= sizeof(uint32_t);
+ if (len < sizeof(uint32_t))
+ return error("corrupt ewah bitmap: eof before length");
self->buffer_size = self->alloc_size = get_be32(ptr);
ptr += sizeof(uint32_t);
+ len -= sizeof(uint32_t);
REALLOC_ARRAY(self->buffer, self->alloc_size);
@@ -141,68 +112,23 @@ int ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
* the endianness conversion in a separate pass to ensure
* we're loading 8-byte aligned words.
*/
- memcpy(self->buffer, ptr, self->buffer_size * sizeof(eword_t));
- ptr += self->buffer_size * sizeof(eword_t);
+ data_len = st_mult(self->buffer_size, sizeof(eword_t));
+ if (len < data_len)
+ return error("corrupt ewah bitmap: eof in data "
+ "(%"PRIuMAX" bytes short)",
+ (uintmax_t)(data_len - len));
+ memcpy(self->buffer, ptr, data_len);
+ ptr += data_len;
+ len -= data_len;
for (i = 0; i < self->buffer_size; ++i)
self->buffer[i] = ntohll(self->buffer[i]);
+ if (len < sizeof(uint32_t))
+ return error("corrupt ewah bitmap: eof before rlw");
self->rlw = self->buffer + get_be32(ptr);
+ ptr += sizeof(uint32_t);
+ len -= sizeof(uint32_t);
- return (3 * 4) + (self->buffer_size * 8);
-}
-
-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;
+ return ptr - (const uint8_t *)map;
}