From f7548d6d28c313cf80e6f3ef89aed16a19815df1 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:51:24 +0200 Subject: Adding upstream version 1:2.3.19.1+dfsg1. Signed-off-by: Daniel Baumann --- src/lib-compression/iostream-lz4.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 src/lib-compression/iostream-lz4.h (limited to 'src/lib-compression/iostream-lz4.h') diff --git a/src/lib-compression/iostream-lz4.h b/src/lib-compression/iostream-lz4.h new file mode 100644 index 0000000..a0897f5 --- /dev/null +++ b/src/lib-compression/iostream-lz4.h @@ -0,0 +1,30 @@ +#ifndef IOSTREAM_LZ4_H +#define IOSTREAM_LZ4_H + +/* + Dovecot's LZ4 compressed files contain: + + IOSTREAM_LZ4_HEADER + n x (4 byte big-endian: compressed chunk length, compressed chunk) +*/ + +#define IOSTREAM_LZ4_MAGIC "Dovecot-LZ4\x0d\x2a\x9b\xc5" +#define IOSTREAM_LZ4_MAGIC_LEN (sizeof(IOSTREAM_LZ4_MAGIC)-1) + +struct iostream_lz4_header { + unsigned char magic[IOSTREAM_LZ4_MAGIC_LEN]; + /* OSTREAM_LZ4_CHUNK_SIZE in big-endian */ + unsigned char max_uncompressed_chunk_size[4]; +}; + +/* How large chunks we're buffering into memory before compressing them */ +#define OSTREAM_LZ4_CHUNK_SIZE (1024*64) +/* How large chunks we allow in input data before returning a failure. + This must be at least OSTREAM_LZ4_CHUNK_SIZE, but for future compatibility + should be somewhat higher (but not too high to avoid wasting memory for + corrupted files). */ +#define ISTREAM_LZ4_CHUNK_SIZE (1024*1024) + +#define IOSTREAM_LZ4_CHUNK_PREFIX_LEN 4 /* big-endian size of chunk */ + +#endif -- cgit v1.2.3