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Cleanups

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This commit is contained in:
twinaphex 2015-07-02 05:18:41 +02:00
parent 0c6809952d
commit eae59d6424
1 changed files with 19 additions and 14 deletions
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33
rewind.c
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@ -64,15 +64,19 @@ size thisstart;
size_t state_manager_raw_maxsize(size_t uncomp) size_t state_manager_raw_maxsize(size_t uncomp)
{ {
const int maxcblkcover = UINT16_MAX * sizeof(uint16_t); /* bytes covered by a compressed block */ /* bytes covered by a compressed block */
size_t uncomp16 = (uncomp + sizeof(uint16_t) - 1) & ~sizeof(uint16_t); /* uncompressed size, rounded to 16 bits */ const int maxcblkcover = UINT16_MAX * sizeof(uint16_t);
size_t maxcblks = (uncomp + maxcblkcover - 1) / maxcblkcover; /* number of blocks */ /* uncompressed size, rounded to 16 bits */
return uncomp16 + maxcblks * sizeof(uint16_t)*2 /* two u16 overhead per block */ + sizeof(uint16_t)*3; /* three u16 to end it */ size_t uncomp16 = (uncomp + sizeof(uint16_t) - 1) & ~sizeof(uint16_t);
/* number of blocks */
size_t maxcblks = (uncomp + maxcblkcover - 1) / maxcblkcover;
return uncomp16 + maxcblks * sizeof(uint16_t) * 2 /* two u16 overhead per block */ + sizeof(uint16_t) *
3; /* three u16 to end it */
} }
void *state_manager_raw_alloc(size_t len, uint16_t uniq) void *state_manager_raw_alloc(size_t len, uint16_t uniq)
{ {
size_t len16 = (len + sizeof(uint16_t) - 1) & ~sizeof(uint16_t); size_t len16 = (len + sizeof(uint16_t) - 1) & ~sizeof(uint16_t);
uint16_t *ret = (uint16_t*)calloc(len16 + sizeof(uint16_t) * 4 + 16, 1); uint16_t *ret = (uint16_t*)calloc(len16 + sizeof(uint16_t) * 4 + 16, 1);
@ -220,10 +224,10 @@ static INLINE size_t find_same(const uint16_t *a, const uint16_t *b)
size_t state_manager_raw_compress(const void *src, const void *dst, size_t len, void *patch) size_t state_manager_raw_compress(const void *src, const void *dst, size_t len, void *patch)
{ {
const uint16_t *old16 = (const uint16_t*)src; const uint16_t *old16 = (const uint16_t*)src;
const uint16_t *new16 = (const uint16_t*)dst; const uint16_t *new16 = (const uint16_t*)dst;
uint16_t *compressed16 = (uint16_t*)patch; uint16_t *compressed16 = (uint16_t*)patch;
size_t num16s = (len + sizeof(uint16_t) - 1) / sizeof(uint16_t); size_t num16s = (len + sizeof(uint16_t) - 1) / sizeof(uint16_t);
while (num16s) while (num16s)
{ {
@ -276,9 +280,10 @@ size_t state_manager_raw_compress(const void *src, const void *dst, size_t len,
return (uint8_t*)(compressed16+3) - (uint8_t*)patch; return (uint8_t*)(compressed16+3) - (uint8_t*)patch;
} }
void state_manager_raw_decompress(const void *patch, size_t patchlen, void *data, size_t datalen) void state_manager_raw_decompress(const void *patch,
size_t patchlen, void *data, size_t datalen)
{ {
uint16_t *out16 = (uint16_t*)data; uint16_t *out16 = (uint16_t*)data;
const uint16_t *patch16 = (const uint16_t*)patch; const uint16_t *patch16 = (const uint16_t*)patch;
(void)patchlen; (void)patchlen;
@ -383,13 +388,13 @@ state_manager_t *state_manager_new(size_t state_size, size_t buffer_size)
if (!state) if (!state)
return NULL; return NULL;
state->blocksize = (state_size + sizeof(uint16_t) - 1) & ~sizeof(uint16_t); state->blocksize = (state_size + sizeof(uint16_t) - 1) & ~sizeof(uint16_t);
/* the compressed data is surrounded by pointers to the other side */ /* the compressed data is surrounded by pointers to the other side */
state->maxcompsize = state_manager_raw_maxsize(state_size) + sizeof(size_t) * 2; state->maxcompsize = state_manager_raw_maxsize(state_size) + sizeof(size_t) * 2;
state->data = (uint8_t*)malloc(buffer_size); state->data = (uint8_t*)malloc(buffer_size);
state->thisblock = (uint8_t*)state_manager_raw_alloc(state_size, 0); state->thisblock = (uint8_t*)state_manager_raw_alloc(state_size, 0);
state->nextblock = (uint8_t*)state_manager_raw_alloc(state_size, 1); state->nextblock = (uint8_t*)state_manager_raw_alloc(state_size, 1);
if (!state->data || !state->thisblock || !state->nextblock) if (!state->data || !state->thisblock || !state->nextblock)
goto error; goto error;