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author | bimbashrestha <bshrestha.msae@gmail.com> | 2019-08-16 23:43:28 (GMT) |
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committer | bimbashrestha <bshrestha.msae@gmail.com> | 2019-08-16 23:43:28 (GMT) |
commit | f839e9fe8a393117c64dff58196d36b741780ab0 (patch) | |
tree | 8e631d375b6b734bd2e8f8385b5e289862a4f3b3 /ossfuzz/fuzz_data_producer.c | |
parent | a9ac05645644a0615b558f6ac655c4ae46c4a926 (diff) | |
download | lz4-f839e9fe8a393117c64dff58196d36b741780ab0.zip lz4-f839e9fe8a393117c64dff58196d36b741780ab0.tar.gz lz4-f839e9fe8a393117c64dff58196d36b741780ab0.tar.bz2 |
Seperating fuzz data producer api impl and header, using data producer on the easy fuzzers
Diffstat (limited to 'ossfuzz/fuzz_data_producer.c')
-rw-r--r-- | ossfuzz/fuzz_data_producer.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/ossfuzz/fuzz_data_producer.c b/ossfuzz/fuzz_data_producer.c new file mode 100644 index 0000000..ae07575 --- /dev/null +++ b/ossfuzz/fuzz_data_producer.c @@ -0,0 +1,32 @@ +#include "fuzz_data_producer.h" + +FUZZ_dataProducer_t *FUZZ_dataProducer_create(const uint8_t *data, size_t size) { + FUZZ_dataProducer_t *producer = malloc(sizeof(FUZZ_dataProducer_t)); + producer->data = data; + producer->size = size; + return producer; +} + +void FUZZ_dataProducer_free(FUZZ_dataProducer_t *producer) { free(producer); } + +uint32_t FUZZ_dataProducer_uint32(FUZZ_dataProducer_t *producer, uint32_t min, + uint32_t max) { + FUZZ_ASSERT(min <= max); + + uint32_t range = max - min; + uint32_t rolling = range; + uint32_t result = 0; + + while (rolling > 0 && producer->size > 0) { + uint8_t next = *(producer->data + producer->size - 1); + producer->size -= 1; + result = (result << 8) | next; + rolling >>= 8; + } + + if (range == 0xffffffff) { + return result; + } + + return min + result % (range + 1); +} |