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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-30 19:13:53 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-30 19:13:53 +0200
commitcebdcd35f09527548635c6f80a7c0ed8c7a79cf1 (patch)
tree2dcd571b6ff6255c09e97c5906dfaf25a4516978 /lib/tar/read_header.c
parent0c23ed54144b1d41d9c0acde1b2404f7ac846e96 (diff)
Add support for gnu pax sparse file formats 0.1 and 1.0
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/tar/read_header.c')
-rw-r--r--lib/tar/read_header.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/lib/tar/read_header.c b/lib/tar/read_header.c
index 23c23c4..e1c9eaf 100644
--- a/lib/tar/read_header.c
+++ b/lib/tar/read_header.c
@@ -163,6 +163,55 @@ static int pax_read_decimal(const char *str, uint64_t *out)
return 0;
}
+static sparse_map_t *read_sparse_map(const char *line)
+{
+ sparse_map_t *last = NULL, *list = NULL, *ent = NULL;
+
+ do {
+ ent = calloc(1, sizeof(*ent));
+ if (ent == NULL)
+ goto fail_errno;
+
+ if (pax_read_decimal(line, &ent->offset))
+ goto fail_format;
+
+ while (isdigit(*line))
+ ++line;
+
+ if (*(line++) != ',')
+ goto fail_format;
+
+ if (pax_read_decimal(line, &ent->count))
+ goto fail_format;
+
+ while (isdigit(*line))
+ ++line;
+
+ if (last == NULL) {
+ list = last = ent;
+ } else {
+ last->next = ent;
+ last = ent;
+ }
+ } while (*(line++) == ',');
+
+ return list;
+fail_errno:
+ perror("parsing GNU pax sparse file record");
+ goto fail;
+fail_format:
+ fputs("malformed GNU pax sparse file record\n", stderr);
+ goto fail;
+fail:
+ while (list != NULL) {
+ ent = list;
+ list = list->next;
+ free(ent);
+ }
+ free(ent);
+ return NULL;
+}
+
static int read_pax_header(int fd, uint64_t entsize, unsigned int *set_by_pax,
tar_header_decoded_t *out)
{
@@ -254,6 +303,19 @@ static int read_pax_header(int fd, uint64_t entsize, unsigned int *set_by_pax,
out->sb.st_ctime = field;
}
*set_by_pax |= PAX_CTIME;
+ } else if (!strncmp(line, "GNU.sparse.name=", 16)) {
+ free(out->name);
+ out->name = strdup(line + 5);
+ if (out->name == NULL)
+ goto fail_errno;
+ *set_by_pax |= PAX_NAME;
+ } else if (!strncmp(line, "GNU.sparse.map=", 15)) {
+ free_sparse_list(out->sparse);
+ sparse_last = NULL;
+
+ out->sparse = read_sparse_map(line + 15);
+ if (out->sparse == NULL)
+ goto fail;
} else if (!strncmp(line, "GNU.sparse.size=", 16)) {
pax_read_decimal(line + 16, &out->actual_size);
*set_by_pax |= PAX_SPARSE_SIZE;