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rewind.c - declare variables at top

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This commit is contained in:
twinaphex 2015-01-09 21:39:44 +01:00
parent af657a3b47
commit 38fdfe2f47
1 changed files with 26 additions and 14 deletions
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40
rewind.c
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@ -90,6 +90,7 @@ static inline void write_size_t(void *ptr, size_t val)
static inline size_t read_size_t(const void *ptr)
{
size_t ret;
memcpy(&ret, ptr, sizeof(ret));
return ret;
}
@ -120,15 +121,18 @@ struct state_manager
state_manager_t *state_manager_new(size_t state_size, size_t buffer_size)
{
size_t newblocksize;
int maxcblks;
const int maxcblkcover = UINT16_MAX * sizeof(uint16_t);
state_manager_t *state = (state_manager_t*)calloc(1, sizeof(*state));
if (!state)
return NULL;
size_t newblocksize = ((state_size - 1) | (sizeof(uint16_t) - 1)) + 1;
newblocksize = ((state_size - 1) | (sizeof(uint16_t) - 1)) + 1;
state->blocksize = newblocksize;
const int maxcblkcover = UINT16_MAX * sizeof(uint16_t);
const int maxcblks = (state->blocksize + maxcblkcover - 1) / maxcblkcover;
maxcblks = (state->blocksize + maxcblkcover - 1) / maxcblkcover;
state->maxcompsize = state->blocksize + maxcblks * sizeof(uint16_t) * 2 +
sizeof(uint16_t) + sizeof(uint32_t) + sizeof(size_t) * 2;
@ -182,6 +186,12 @@ void state_manager_free(state_manager_t *state)
bool state_manager_pop(state_manager_t *state, const void **data)
{
size_t start;
uint8_t *out;
uint16_t *out16;
const uint8_t *compressed = NULL;
const uint16_t *compressed16 = NULL;
*data = NULL;
if (state->thisblock_valid)
@ -195,21 +205,22 @@ bool state_manager_pop(state_manager_t *state, const void **data)
if (state->head == state->tail)
return false;
size_t start = read_size_t(state->head - sizeof(size_t));
start = read_size_t(state->head - sizeof(size_t));
state->head = state->data + start;
const uint8_t *compressed = state->data + start + sizeof(size_t);
uint8_t *out = state->thisblock;
compressed = state->data + start + sizeof(size_t);
out = state->thisblock;
/* Begin decompression code
* out is the last pushed (or returned) state */
const uint16_t *compressed16 = (const uint16_t*)compressed;
uint16_t *out16 = (uint16_t*)out;
compressed16 = (const uint16_t*)compressed;
out16 = (uint16_t*)out;
for (;;)
{
uint16_t i;
uint16_t numchanged = *(compressed16++);
if (numchanged)
{
out16 += *compressed16++;
@ -228,6 +239,7 @@ bool state_manager_pop(state_manager_t *state, const void **data)
else
{
uint32_t numunchanged = compressed16[0] | (compressed16[1] << 16);
if (!numunchanged)
break;
compressed16 += 2;
@ -296,11 +308,11 @@ static inline size_t find_change(const uint16_t *a, const uint16_t *b)
for (;;)
{
__m128i v0 = _mm_loadu_si128(a128);
__m128i v1 = _mm_loadu_si128(b128);
__m128i c = _mm_cmpeq_epi32(v0, v1);
__m128i v0 = _mm_loadu_si128(a128);
__m128i v1 = _mm_loadu_si128(b128);
__m128i c = _mm_cmpeq_epi32(v0, v1);
uint32_t mask = _mm_movemask_epi8(c);
if (mask != 0xffff) /* Something has changed, figure out where. */
{
size_t ret = (((uint8_t*)a128 - (uint8_t*)a) |
@ -498,8 +510,8 @@ recheckcapacity:;
void state_manager_capacity(state_manager_t *state,
unsigned *entries, size_t *bytes, bool *full)
{
size_t headpos = state->head - state->data;
size_t tailpos = state->tail - state->data;
size_t headpos = state->head - state->data;
size_t tailpos = state->tail - state->data;
size_t remaining = (tailpos + state->capacity -
sizeof(size_t) - headpos - 1) % state->capacity + 1;