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44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* This module handles generating & modifying messages randomly for the fuzz test. */
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#ifndef RANDOM_DATA_H
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#define RANDOM_DATA_H
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#include <pb.h>
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void random_set_seed(uint32_t seed);
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uint32_t random_get_seed();
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/* Random 32-bit integer */
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uint32_t rand_word();
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/* Get a random integer in range, with approximately flat distribution. */
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int rand_int(int min, int max);
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/* Random boolean, equal probability */
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bool rand_bool();
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/* Get a random byte, with skewed distribution.
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* Important corner cases like 0xFF, 0x00 and 0xFE occur more
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* often than other values. */
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uint8_t rand_byte();
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/* Get a random length, with skewed distribution.
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* Favors the shorter lengths, but always at least 1. */
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size_t rand_len(size_t max);
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/* Fills a buffer with random bytes with skewed distribution. */
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void rand_fill(uint8_t *buf, size_t count);
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/* Fill with random protobuf-like data */
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size_t rand_fill_protobuf(uint8_t *buf, size_t min_bytes, size_t max_bytes, int min_tag);
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/* Given a buffer of data, mess it up a bit by copying / swapping bytes */
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void rand_mess(uint8_t *buf, size_t count);
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/* Append or prepend protobuf noise, with tag values > 1000 */
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void rand_protobuf_noise(uint8_t *buffer, size_t bufsize, size_t *msglen);
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#endif
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