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#include "../src/meshoptimizer.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
void fuzzDecoder(const uint8_t* data, size_t size, size_t stride, int (*decode)(void*, size_t, size_t, const unsigned char*, size_t))
{
size_t count = 66; // must be divisible by 3 for decodeIndexBuffer; should be >=64 to cover large vertex blocks
void* destination = malloc(count * stride);
assert(destination);
int rc = decode(destination, count, stride, reinterpret_cast<const unsigned char*>(data), size);
(void)rc;
free(destination);
}
void fuzzRoundtrip(const uint8_t* data, size_t size, size_t stride)
{
size_t count = size / stride;
size_t bound = meshopt_encodeVertexBufferBound(count, stride);
void* encoded = malloc(bound);
void* decoded = malloc(count * stride);
assert(encoded && decoded);
size_t res = meshopt_encodeVertexBuffer(static_cast<unsigned char*>(encoded), bound, data, count, stride);
assert(res <= bound);
int rc = meshopt_decodeVertexBuffer(decoded, count, stride, static_cast<unsigned char*>(encoded), res);
assert(rc == 0);
assert(memcmp(data, decoded, count * stride) == 0);
free(decoded);
free(encoded);
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
// decodeIndexBuffer supports 2 and 4-byte indices
fuzzDecoder(data, size, 2, meshopt_decodeIndexBuffer);
fuzzDecoder(data, size, 4, meshopt_decodeIndexBuffer);
// decodeIndexSequence supports 2 and 4-byte indices
fuzzDecoder(data, size, 2, meshopt_decodeIndexSequence);
fuzzDecoder(data, size, 4, meshopt_decodeIndexSequence);
// decodeVertexBuffer supports any strides divisible by 4 in 4-256 interval
// It's a waste of time to check all of them, so we'll just check a few with different alignment mod 16
fuzzDecoder(data, size, 4, meshopt_decodeVertexBuffer);
fuzzDecoder(data, size, 16, meshopt_decodeVertexBuffer);
fuzzDecoder(data, size, 24, meshopt_decodeVertexBuffer);
fuzzDecoder(data, size, 32, meshopt_decodeVertexBuffer);
// encodeVertexBuffer/decodeVertexBuffer should roundtrip for any stride, check a few with different alignment mod 16
fuzzRoundtrip(data, size, 4);
fuzzRoundtrip(data, size, 16);
fuzzRoundtrip(data, size, 24);
fuzzRoundtrip(data, size, 32);
return 0;
}
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