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#include "fuzz_data_producer.h"
struct FUZZ_dataProducer_s{
const uint8_t *data;
size_t size;
};
FUZZ_dataProducer_t* FUZZ_dataProducer_create(const uint8_t* data, size_t size) {
FUZZ_dataProducer_t* const producer = malloc(sizeof(FUZZ_dataProducer_t));
FUZZ_ASSERT(producer != NULL);
producer->data = data;
producer->size = size;
return producer;
}
void FUZZ_dataProducer_free(FUZZ_dataProducer_t *producer) { free(producer); }
uint32_t FUZZ_dataProducer_retrieve32(FUZZ_dataProducer_t *producer) {
const uint8_t* data = producer->data;
const size_t size = producer->size;
if (size == 0) {
return 0;
} else if (size < 4) {
producer->size -= 1;
return (uint32_t)data[size - 1];
} else {
producer->size -= 4;
return *(data + size - 4);
}
}
uint32_t FUZZ_getRange_from_uint32(uint32_t seed, uint32_t min, uint32_t max)
{
uint32_t range = max - min;
if (range == 0xffffffff) {
return seed;
}
return min + seed % (range + 1);
}
uint32_t FUZZ_dataProducer_range32(FUZZ_dataProducer_t* producer,
uint32_t min, uint32_t max)
{
size_t const seed = FUZZ_dataProducer_retrieve32(producer);
return FUZZ_getRange_from_uint32(seed, min, max);
}
LZ4F_frameInfo_t FUZZ_dataProducer_frameInfo(FUZZ_dataProducer_t* producer)
{
LZ4F_frameInfo_t info = LZ4F_INIT_FRAMEINFO;
info.blockSizeID = FUZZ_dataProducer_range32(producer, LZ4F_max64KB - 1, LZ4F_max4MB);
if (info.blockSizeID < LZ4F_max64KB) {
info.blockSizeID = LZ4F_default;
}
info.blockMode = FUZZ_dataProducer_range32(producer, LZ4F_blockLinked, LZ4F_blockIndependent);
info.contentChecksumFlag = FUZZ_dataProducer_range32(producer, LZ4F_noContentChecksum,
LZ4F_contentChecksumEnabled);
info.blockChecksumFlag = FUZZ_dataProducer_range32(producer, LZ4F_noBlockChecksum,
LZ4F_blockChecksumEnabled);
return info;
}
LZ4F_preferences_t FUZZ_dataProducer_preferences(FUZZ_dataProducer_t* producer)
{
LZ4F_preferences_t prefs = LZ4F_INIT_PREFERENCES;
prefs.frameInfo = FUZZ_dataProducer_frameInfo(producer);
prefs.compressionLevel = FUZZ_dataProducer_range32(producer, 0, LZ4HC_CLEVEL_MAX + 3) - 3;
prefs.autoFlush = FUZZ_dataProducer_range32(producer, 0, 1);
prefs.favorDecSpeed = FUZZ_dataProducer_range32(producer, 0, 1);
return prefs;
}
size_t FUZZ_dataProducer_remainingBytes(FUZZ_dataProducer_t *producer){
return producer->size;
}
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