static void use(int bytes)
{
if (bytes > len)
die("used more bytes than were available");
len -= bytes;
offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die("pack too large for current definition of off_t");
consumed_bytes += bytes;
}
static void use(int bytes)
{
if (bytes > input_len)
die(_("used more bytes than were available"));
input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
input_len -= bytes;
input_offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die(_("pack too large for current definition of off_t"));
consumed_bytes += bytes;
}
static void use(int bytes)
{
if (bytes > len)
die("used more bytes than were available");
len -= bytes;
offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die("pack too large for current definition of off_t");
consumed_bytes += bytes;
if (max_input_size && consumed_bytes > max_input_size)
die(_("pack exceeds maximum allowed size"));
}
static int check_offset_overflow(off_t offset, uintmax_t len)
{
#if 0
if (len > maximum_signed_value_of_type(off_t))
return error("unrepresentable length in delta: "
"%"PRIuMAX" > OFF_MAX", len);
if (signed_add_overflows(offset, (off_t) len))
return error("unrepresentable offset in delta: "
"%"PRIuMAX" + %"PRIuMAX" > OFF_MAX",
(uintmax_t) offset, len);
#endif
if (offset > (INT64_MAX/2) || len > (INT64_MAX/2)) {
printf("Overflow or close enough.\n");
return -1;
}
return 0;
}
static long apply_delta(off_t len, struct line_buffer *input,
const char *old_data, uint32_t old_mode)
{
long ret;
struct sliding_view preimage = SLIDING_VIEW_INIT(&report_buffer, 0);
FILE *out;
if (init_postimage() || !(out = buffer_tmpfile_rewind(&postimage)))
die("cannot open temporary file for blob retrieval");
if (old_data) {
const char *response;
printf("cat-blob %s\n", old_data);
fflush(stdout);
response = get_response_line();
if (parse_cat_response_line(response, &preimage.max_off))
die("invalid cat-blob response: %s", response);
check_preimage_overflow(preimage.max_off, 1);
}
if (old_mode == REPO_MODE_LNK) {
strbuf_addstr(&preimage.buf, "link ");
check_preimage_overflow(preimage.max_off, strlen("link "));
preimage.max_off += strlen("link ");
check_preimage_overflow(preimage.max_off, 1);
}
if (svndiff0_apply(input, len, &preimage, out))
die("cannot apply delta");
if (old_data) {
/* Read the remainder of preimage and trailing newline. */
assert(!signed_add_overflows(preimage.max_off, 1));
preimage.max_off++; /* room for newline */
if (move_window(&preimage, preimage.max_off - 1, 1))
die("cannot seek to end of input");
if (preimage.buf.buf[0] != '\n')
die("missing newline after cat-blob response");
}
ret = buffer_tmpfile_prepare_to_read(&postimage);
if (ret < 0)
die("cannot read temporary file for blob retrieval");
strbuf_release(&preimage.buf);
return ret;
}
static void check_preimage_overflow(off_t a, off_t b)
{
if (signed_add_overflows(a, b))
die("blob too large for current definition of off_t");
}
