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tar/tar-1.15.1-hugeSparse.patch

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--- tar-1.15.1/src/sparse.c.hugeSparse 2006-03-22 13:18:53.000000000 -0500
+++ tar-1.15.1/src/sparse.c 2006-03-22 13:24:54.000000000 -0500
@@ -47,9 +47,9 @@
{
int fd; /* File descriptor */
bool seekable; /* Is fd seekable? */
- size_t offset; /* Current offset in fd if seekable==false.
+ off_t offset; /* Current offset in fd if seekable==false.
Otherwise unused */
- size_t dumped_size; /* Number of bytes actually written
+ off_t dumped_size; /* Number of bytes actually written
to the archive */
struct tar_stat_info *stat_info; /* Information about the file */
struct tar_sparse_optab *optab;
@@ -59,35 +59,34 @@
/* Dump zeros to file->fd until offset is reached. It is used instead of
lseek if the output file is not seekable */
-static long
+static bool
dump_zeros (struct tar_sparse_file *file, off_t offset)
{
- char buf[BLOCKSIZE];
-
- if (offset - file->offset < 0)
+ static char const zero_buf[BLOCKSIZE];
+
+ if (offset < file->offset)
{
errno = EINVAL;
- return -1;
+ return false;
}
- memset (buf, 0, sizeof buf);
while (file->offset < offset)
{
- size_t size = offset - file->offset;
- size_t wrbytes;
-
- if (size > sizeof buf)
- size = sizeof buf;
- wrbytes = write (file->fd, buf, size);
+ size_t size = (BLOCKSIZE < offset - file->offset
+ ? BLOCKSIZE
+ : offset - file->offset);
+ ssize_t wrbytes;
+
+ wrbytes = write (file->fd, zero_buf, size);
if (wrbytes <= 0)
{
if (wrbytes == 0)
errno = EINVAL;
- return -1;
+ return false;
}
file->offset += wrbytes;
}
- return file->offset;
+ return true;
}
static bool
@@ -168,14 +167,9 @@
static bool
lseek_or_error (struct tar_sparse_file *file, off_t offset)
{
- off_t off;
-
- if (file->seekable)
- off = lseek (file->fd, offset, SEEK_SET);
- else
- off = dump_zeros (file, offset);
-
- if (off < 0)
+ if (file->seekable
+ ? lseek (file->fd, offset, SEEK_SET) < 0
+ : ! dump_zeros (file, offset))
{
seek_diag_details (file->stat_info->orig_file_name, offset);
return false;
@@ -187,7 +181,7 @@
it's made *entirely* of zeros, returning a 0 the instant it finds
something that is a nonzero, i.e., useful data. */
static bool
-zero_block_p (char *buffer, size_t size)
+zero_block_p (char const *buffer, size_t size)
{
while (size--)
if (*buffer++)
@@ -195,50 +189,36 @@
return true;
}
-#define clear_block(p) memset (p, 0, BLOCKSIZE);
-
-#define SPARSES_INIT_COUNT SPARSES_IN_SPARSE_HEADER
-
static void
-sparse_add_map (struct tar_sparse_file *file, struct sp_array *sp)
+sparse_add_map (struct tar_stat_info *st, struct sp_array const *sp)
{
- if (file->stat_info->sparse_map == NULL)
- {
- file->stat_info->sparse_map =
- xmalloc (SPARSES_INIT_COUNT * sizeof file->stat_info->sparse_map[0]);
- file->stat_info->sparse_map_size = SPARSES_INIT_COUNT;
- }
- else if (file->stat_info->sparse_map_avail == file->stat_info->sparse_map_size)
- {
- file->stat_info->sparse_map_size *= 2;
- file->stat_info->sparse_map =
- xrealloc (file->stat_info->sparse_map,
- file->stat_info->sparse_map_size
- * sizeof file->stat_info->sparse_map[0]);
- }
- file->stat_info->sparse_map[file->stat_info->sparse_map_avail++] = *sp;
+ struct sp_array *sparse_map = st->sparse_map;
+ size_t avail = st->sparse_map_avail;
+ if (avail == st->sparse_map_size)
+ st->sparse_map = sparse_map =
+ x2nrealloc (sparse_map, &st->sparse_map_size, sizeof *sparse_map);
+ sparse_map[avail] = *sp;
+ st->sparse_map_avail = avail + 1;
}
/* Scan the sparse file and create its map */
static bool
sparse_scan_file (struct tar_sparse_file *file)
{
- static char buffer[BLOCKSIZE];
+ struct tar_stat_info *st = file->stat_info;
+ int fd = file->fd;
+ char buffer[BLOCKSIZE];
size_t count;
off_t offset = 0;
struct sp_array sp = {0, 0};
if (!lseek_or_error (file, 0))
return false;
- clear_block (buffer);
-
- file->stat_info->sparse_map_avail = 0;
- file->stat_info->archive_file_size = 0;
if (!tar_sparse_scan (file, scan_begin, NULL))
return false;
- while ((count = safe_read (file->fd, buffer, sizeof buffer)) != 0
+ while ((count = safe_read (fd, buffer, sizeof buffer)) != 0
&& count != SAFE_READ_ERROR)
{
/* Analize the block */
@@ -246,7 +226,7 @@
{
if (sp.numbytes)
{
- sparse_add_map (file, &sp);
+ sparse_add_map (st, &sp);
sp.numbytes = 0;
if (!tar_sparse_scan (file, scan_block, NULL))
return false;
@@ -257,26 +237,25 @@
if (sp.numbytes == 0)
sp.offset = offset;
sp.numbytes += count;
- file->stat_info->archive_file_size += count;
+ st->archive_file_size += count;
if (!tar_sparse_scan (file, scan_block, buffer))
return false;
}
offset += count;
- clear_block (buffer);
}
if (sp.numbytes == 0)
sp.offset = offset;
- sparse_add_map (file, &sp);
- file->stat_info->archive_file_size += count;
+ sparse_add_map (st, &sp);
+ st->archive_file_size += count;
return tar_sparse_scan (file, scan_end, NULL);
}
-static struct tar_sparse_optab oldgnu_optab;
-static struct tar_sparse_optab star_optab;
-static struct tar_sparse_optab pax_optab;
+static struct tar_sparse_optab const oldgnu_optab;
+static struct tar_sparse_optab const star_optab;
+static struct tar_sparse_optab const pax_optab;
static bool
sparse_select_optab (struct tar_sparse_file *file)
@@ -321,18 +300,18 @@
size_t bytes_read;
blk = find_next_block ();
- memset (blk->buffer, 0, BLOCKSIZE);
bytes_read = safe_read (file->fd, blk->buffer, bufsize);
if (bytes_read == SAFE_READ_ERROR)
{
read_diag_details (file->stat_info->orig_file_name,
- file->stat_info->sparse_map[i].offset
- + file->stat_info->sparse_map[i].numbytes
- - bytes_left,
- bufsize);
+ (file->stat_info->sparse_map[i].offset
+ + file->stat_info->sparse_map[i].numbytes
+ - bytes_left),
+ bufsize);
return false;
}
+ memset (blk->buffer + bytes_read, 0, BLOCKSIZE - bytes_read);
bytes_left -= bytes_read;
file->dumped_size += bytes_read;
set_next_block_after (blk);
@@ -389,12 +368,11 @@
sparse_dump_file (int fd, struct tar_stat_info *st)
{
bool rc;
- struct tar_sparse_file file;
+ struct tar_sparse_file file = { 0, };
file.stat_info = st;
file.fd = fd;
file.seekable = true; /* File *must* be seekable for dump to work */
- file.offset = 0;
if (!sparse_select_optab (&file)
|| !tar_sparse_init (&file))
@@ -456,15 +434,14 @@
struct tar_sparse_file file;
size_t i;
+ if (!tar_sparse_init (&file))
+ return dump_status_not_implemented;
+
file.stat_info = st;
file.fd = fd;
file.seekable = lseek (fd, 0, SEEK_SET) == 0;
file.offset = 0;
- if (!sparse_select_optab (&file)
- || !tar_sparse_init (&file))
- return dump_status_not_implemented;
-
rc = tar_sparse_decode_header (&file);
for (i = 0; rc && i < file.stat_info->sparse_map_avail; i++)
rc = tar_sparse_extract_region (&file, i);
@@ -491,8 +468,6 @@
}
-static char diff_buffer[BLOCKSIZE];
-
static bool
check_sparse_region (struct tar_sparse_file *file, off_t beg, off_t end)
{
@@ -502,11 +477,9 @@
while (beg < end)
{
size_t bytes_read;
- size_t rdsize = end - beg;
+ size_t rdsize = BLOCKSIZE < end - beg ? BLOCKSIZE : end - beg;
+ char diff_buffer[BLOCKSIZE];
- if (rdsize > BLOCKSIZE)
- rdsize = BLOCKSIZE;
- clear_block (diff_buffer);
bytes_read = safe_read (file->fd, diff_buffer, rdsize);
if (bytes_read == SAFE_READ_ERROR)
{
@@ -539,6 +512,7 @@
{
size_t bytes_read;
size_t rdsize = (size_left > BLOCKSIZE) ? BLOCKSIZE : size_left;
+ char diff_buffer[BLOCKSIZE];
union block *blk = find_next_block ();
if (!blk)
@@ -551,9 +525,9 @@
if (bytes_read == SAFE_READ_ERROR)
{
read_diag_details (file->stat_info->orig_file_name,
- file->stat_info->sparse_map[i].offset
- + file->stat_info->sparse_map[i].numbytes
- - size_left,
+ (file->stat_info->sparse_map[i].offset
+ + file->stat_info->sparse_map[i].numbytes
+ - size_left),
rdsize);
return false;
}
@@ -647,7 +621,7 @@
|| file->stat_info->archive_file_size < 0)
return add_fail;
- sparse_add_map (file, &sp);
+ sparse_add_map (file->stat_info, &sp);
return add_ok;
}
@@ -669,7 +643,7 @@
size_t i;
union block *h = current_header;
int ext_p;
- static enum oldgnu_add_status rc;
+ enum oldgnu_add_status rc;
file->stat_info->sparse_map_avail = 0;
for (i = 0; i < SPARSES_IN_OLDGNU_HEADER; i++)
@@ -756,7 +730,7 @@
return true;
}
-static struct tar_sparse_optab oldgnu_optab = {
+static struct tar_sparse_optab const oldgnu_optab = {
NULL, /* No init function */
NULL, /* No done function */
oldgnu_sparse_member_p,
@@ -795,7 +769,7 @@
size_t i;
union block *h = current_header;
int ext_p;
- static enum oldgnu_add_status rc;
+ enum oldgnu_add_status rc;
file->stat_info->sparse_map_avail = 0;
@@ -837,7 +811,7 @@
}
-static struct tar_sparse_optab star_optab = {
+static struct tar_sparse_optab const star_optab = {
NULL, /* No init function */
NULL, /* No done function */
star_sparse_member_p,
@@ -890,7 +864,7 @@
return true;
}
-static struct tar_sparse_optab pax_optab = {
+static struct tar_sparse_optab const pax_optab = {
NULL, /* No init function */
NULL, /* No done function */
pax_sparse_member_p,
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