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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-13 13:37:42 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-16 09:34:35 +0200
commitf757737060d4daebb24a32e90d912661428708a8 (patch)
treea6e96145d4fc540e435c13a69c924329db2edb6d /lib/tar/read_header.c
parentc1a2cb729bd5bb5fdadf00cb3968bbc541f79750 (diff)
Remodel libtar/tar2sqfs to read data from an istream_t
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.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/lib/tar/read_header.c b/lib/tar/read_header.c
index 14752ea..b332514 100644
--- a/lib/tar/read_header.c
+++ b/lib/tar/read_header.c
@@ -170,20 +170,24 @@ static int decode_header(const tar_header_t *hdr, unsigned int set_by_pax,
return 0;
}
-int read_header(FILE *fp, tar_header_decoded_t *out)
+int read_header(istream_t *fp, tar_header_decoded_t *out)
{
unsigned int set_by_pax = 0;
bool prev_was_zero = false;
sqfs_u64 pax_size;
tar_header_t hdr;
- int version;
+ int version, ret;
memset(out, 0, sizeof(*out));
for (;;) {
- if (read_retry("reading tar header", fp, &hdr, sizeof(hdr)))
+ ret = istream_read(fp, &hdr, sizeof(hdr));
+ if (ret < 0)
goto fail;
+ if ((size_t)ret < sizeof(hdr))
+ goto out_eof;
+
if (is_zero_block(&hdr)) {
if (prev_was_zero)
goto out_eof;
@@ -294,3 +298,17 @@ fail:
clear_header(out);
return -1;
}
+
+int skip_padding(istream_t *fp, sqfs_u64 size)
+{
+ size_t tail = size % 512;
+
+ return tail ? istream_skip(fp, 512 - tail) : 0;
+}
+
+int skip_entry(istream_t *fp, sqfs_u64 size)
+{
+ size_t tail = size % 512;
+
+ return istream_skip(fp, tail ? (size + 512 - tail) : size);
+}