X-Git-Url: http://git.draconx.ca/gitweb/upkg.git/blobdiff_plain/3dd8f219561d68c12b04ef2d226a23e495b7c540..0ea001fde2555a1335161632b2d78c9397d8f53d:/src/libupkg.c

diff --git a/src/libupkg.c b/src/libupkg.c
index f7c55ba..4bb13a3 100644
--- a/src/libupkg.c
+++ b/src/libupkg.c
@@ -124,6 +124,34 @@ static struct upkg *init_upkg(unsigned char hdr[static UPKG_HDR_SIZE])
 	return &alloc->pkg;
 }
 
+static int pkg_init_guid(struct upkg *pkg)
+{
+	size_t rc;
+
+	if (pkg->version < 68) {
+		unsigned long heritage_count, heritage_offset;
+		unsigned char buf[8];
+
+		rc = fread(buf, 1, sizeof buf, pkg->priv->f);
+		if (rc < 8)
+			return -1;
+
+		heritage_count  = unpack_32_le(buf+0);
+		heritage_offset = unpack_32_le(buf+4);
+
+		if (heritage_count == 0)
+			return -1;
+		if (fseek(pkg->priv->f, heritage_offset, SEEK_SET) != 0)
+			return -1;
+	}
+
+	rc = fread(pkg->guid, 1, 16, pkg->priv->f);
+	if (rc < 16)
+		return -1;
+
+	return 0;
+}
+
 static int pkg_init_names(struct upkg *pkg)
 {
 	size_t rc, len, nbuf = 0;
@@ -335,6 +363,10 @@ struct upkg *upkg_fopen(const char *path)
 	}
 	pkg->priv->f = f;
 
+	if (pkg_init_guid(pkg) != 0) {
+		goto err2;
+	}
+
 	if (pkg_init_names(pkg) != 0) {
 		goto err2;
 	}
@@ -442,8 +474,14 @@ int upkg_export_seek(struct upkg_file *f, long offset, int whence)
 		break;
 	}
 
-	if (rc == 0)
+	if (rc == 0) {
 		f->pkg->priv->last_file = f;
+		f->offset = offset;
+		f->eof = 0;
+	} else if (f->pkg->priv->last_file == f) {
+		f->pkg->priv->last_file = NULL;
+	}
+
 	return rc;
 }
 
@@ -463,5 +501,8 @@ size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n)
 
 	rc = fread(buf, 1, want, f->pkg->priv->f);
 	f->offset += rc;
+
+	if (want < n || rc < want && feof(f->pkg->priv->f))
+		f->eof = 1;
 	return rc;
 }