deBool Buffer_resize (Buffer* buffer, size_t newSize)
{
/* Grow buffer if necessary. */
if (newSize > buffer->capacity)
{
size_t newCapacity = (size_t)deAlign32(deMax32(2*(int)buffer->capacity, (int)newSize), 512);
deUint8* newData = (deUint8*)deMalloc(newCapacity);
if (!newData)
return DE_FALSE;
memcpy(newData, buffer->data, buffer->size);
deFree(buffer->data);
buffer->data = newData;
buffer->capacity = newCapacity;
}
buffer->size = newSize;
return DE_TRUE;
}
void deInt32_selfTest (void)
{
const int NUM_ACCURATE_BITS = 29;
deRandom rnd;
deUint32 rcp;
int exp;
int numBits;
deRandom_init(&rnd, 0xdeadbeefu-1);
/* Test deClz32(). */
DE_TEST_ASSERT(deClz32(0) == 32);
DE_TEST_ASSERT(deClz32(1) == 31);
DE_TEST_ASSERT(deClz32(0xF1) == 24);
DE_TEST_ASSERT(deClz32(0xBC12) == 16);
DE_TEST_ASSERT(deClz32(0xABBACD) == 8);
DE_TEST_ASSERT(deClz32(0x10000000) == 3);
DE_TEST_ASSERT(deClz32(0x20000000) == 2);
DE_TEST_ASSERT(deClz32(0x40000000) == 1);
DE_TEST_ASSERT(deClz32(0x80000000) == 0);
/* Test simple inputs for dePop32(). */
DE_TEST_ASSERT(dePop32(0) == 0);
DE_TEST_ASSERT(dePop32(~0) == 32);
DE_TEST_ASSERT(dePop32(0xFF) == 8);
DE_TEST_ASSERT(dePop32(0xFF00FF) == 16);
DE_TEST_ASSERT(dePop32(0x3333333) == 14);
DE_TEST_ASSERT(dePop32(0x33333333) == 16);
/* dePop32(): Check exp2(N) values and inverses. */
for (numBits = 0; numBits < 32; numBits++)
{
DE_TEST_ASSERT(dePop32(1<<numBits) == 1);
DE_TEST_ASSERT(dePop32(~(1<<numBits)) == 31);
}
/* Check exp2(N) values. */
for (numBits = 0; numBits < 32; numBits++)
{
deUint32 val = (1u<<numBits);
deRcp32(val, &rcp, &exp);
DE_TEST_ASSERT(rcp == (1u<<DE_RCP_FRAC_BITS));
DE_TEST_ASSERT(exp == numBits);
}
/* Check random values. */
for (numBits = 0; numBits < 32; numBits++)
{
int NUM_ITERS = deMax32(16, 1 << (numBits/2));
int iter;
for (iter = 0; iter < NUM_ITERS; iter++)
{
const int EPS = 1 << (DE_RCP_FRAC_BITS - NUM_ACCURATE_BITS);
deUint32 val = (deRandom_getUint32(&rnd) & ((1u<<numBits)-1)) | (1u<<numBits);
deUint32 ref = (deUint32)(((1.0f / (double)val) * (double)(1<<DE_RCP_FRAC_BITS)) * (double)(1u<<numBits));
deRcp32(val, &rcp, &exp);
DE_TEST_ASSERT(rcp >= ref-EPS && rcp < ref+EPS);
DE_TEST_ASSERT(exp == numBits);
}
}
DE_TEST_ASSERT(deBitMask32(0, 0) == 0);
DE_TEST_ASSERT(deBitMask32(8, 0) == 0);
DE_TEST_ASSERT(deBitMask32(16, 0) == 0);
DE_TEST_ASSERT(deBitMask32(31, 0) == 0);
DE_TEST_ASSERT(deBitMask32(32, 0) == 0);
DE_TEST_ASSERT(deBitMask32(0, 2) == 3);
DE_TEST_ASSERT(deBitMask32(0, 32) == 0xFFFFFFFFu);
DE_TEST_ASSERT(deBitMask32(16, 16) == 0xFFFF0000u);
DE_TEST_ASSERT(deBitMask32(31, 1) == 0x80000000u);
DE_TEST_ASSERT(deBitMask32(8, 4) == 0xF00u);
DE_TEST_ASSERT(deUintMaxValue32(1) == 1);
DE_TEST_ASSERT(deUintMaxValue32(2) == 3);
DE_TEST_ASSERT(deUintMaxValue32(32) == 0xFFFFFFFFu);
DE_TEST_ASSERT(deIntMaxValue32(1) == 0);
DE_TEST_ASSERT(deIntMaxValue32(2) == 1);
DE_TEST_ASSERT(deIntMaxValue32(32) == 0x7FFFFFFF);
DE_TEST_ASSERT(deIntMinValue32(1) == -1);
DE_TEST_ASSERT(deIntMinValue32(2) == -2);
DE_TEST_ASSERT(deIntMinValue32(32) == -0x7FFFFFFF - 1);
}