Multistream WARCs and better Zstandard support

[tofuproxy.git] / warc / uncompressed.go

diff --git a/warc/uncompressed.go b/warc/uncompressed.go
new file mode 100644 (file)
index 0000000..5dd60c5
--- /dev/null
+++ b/warc/uncompressed.go
@@ -0,0 +1,51 @@
+/*
+tofuproxy -- flexible HTTP/WARC proxy with TLS certificates management
+Copyright (C) 2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package warc
+
+import (
+       "io"
+       "os"
+)
+
+type UncompressedReader struct {
+       *os.File
+}
+
+func NewUncompressedReader(warcPath string, offset int64) (*UncompressedReader, error) {
+       fd, err := os.Open(warcPath)
+       if err != nil {
+               return nil, err
+       }
+       if _, err = fd.Seek(offset, io.SeekStart); err != nil {
+               fd.Close()
+               return nil, err
+       }
+       return &UncompressedReader{File: fd}, nil
+}
+
+func (r *UncompressedReader) Read(p []byte) (int, error) {
+       return r.File.Read(p)
+}
+
+func (r *UncompressedReader) Close() error {
+       return r.File.Close()
+}
+
+func (r *UncompressedReader) Offsets() []Offset {
+       return nil
+}