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Diffstat (limited to 'src/fe_utils/astreamer_gzip.c')
| -rw-r--r-- | src/fe_utils/astreamer_gzip.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/fe_utils/astreamer_gzip.c b/src/fe_utils/astreamer_gzip.c index dd28defac7b..ed9ec50fedd 100644 --- a/src/fe_utils/astreamer_gzip.c +++ b/src/fe_utils/astreamer_gzip.c @@ -2,6 +2,21 @@ * * astreamer_gzip.c * + * Archive streamers that deal with data compressed using gzip. + * astreamer_gzip_writer applies gzip compression to the input data + * and writes the result to a file. astreamer_gzip_decompressor assumes + * that the input stream is compressed using gzip and decompresses it. + * + * Note that the code in this file is asymmetric with what we do for + * other compression types: for lz4 and zstd, there is a compressor and + * a decompressor, rather than a writer and a decompressor. The approach + * taken here is less flexible, because a writer can only write to a file, + * while a compressor can write to a subsequent astreamer which is free + * to do whatever it likes. The reason it's like this is because this + * code was adapated from old, less-modular pg_basebackup code that used + * the same APIs that astreamer_gzip_writer now uses, and it didn't seem + * necessary to change anything at the time. + * * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group * * IDENTIFICATION |