Mercurial > dovecot > core-2.2

annotate src/lib-compression/iostream-lz4.h @ 22616:629f44740f50

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cassandra: Include "prepared" when logging about prepared statement queries Mainly useful for debugging/testing.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Mon, 16 Oct 2017 15:12:12 +0300
parents fb4a0a84da50
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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fb4a0a84da50 lib-compression: Added initial support for LZ4
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1 #ifndef IOSTREAM_LZ4_H
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2 #define IOSTREAM_LZ4_H
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3
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4 /*
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5 Dovecot's LZ4 compressed files contain:
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6
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7 IOSTREAM_LZ4_HEADER
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8 n x (4 byte big-endian: compressed chunk length, compressed chunk)
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9 */
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10
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11 #define IOSTREAM_LZ4_MAGIC "Dovecot-LZ4\x0d\x2a\x9b\xc5"
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12 #define IOSTREAM_LZ4_MAGIC_LEN (sizeof(IOSTREAM_LZ4_MAGIC)-1)
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13
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14 struct iostream_lz4_header {
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15 unsigned char magic[IOSTREAM_LZ4_MAGIC_LEN];
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16 /* OSTREAM_LZ4_CHUNK_SIZE in big-endian */
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17 unsigned char max_uncompressed_chunk_size[4];
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18 };
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19
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20 /* How large chunks we're buffering into memory before compressing them */
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21 #define OSTREAM_LZ4_CHUNK_SIZE (1024*64)
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22 /* How large chunks we allow in input data before returning a failure.
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23 This must be at least OSTREAM_LZ4_CHUNK_SIZE, but for future compatibility
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24 should be somewhat higher (but not too high to avoid wasting memory for
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25 corrupted files). */
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26 #define ISTREAM_LZ4_CHUNK_SIZE (1024*1024)
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27
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28 #define IOSTREAM_LZ4_CHUNK_PREFIX_LEN 4 /* big-endian size of chunk */
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29
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30 #endif