/usr/include/dovecot/iostream-lz4.h is in dovecot-dev 1:2.2.22-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 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
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