Newly created files
git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@2765 8092fc87-c524-0410-9efc-e669fe64eaf9
This commit is contained in:
Meep-Eep
@@ -0,0 +1,309 @@
|
||||
/*
|
||||
* Copyright Serge van den Boom (svdb@stack.nl)
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
// Define WANT_64BITS_BYTESEX before includeing this file if you want
|
||||
// functions for 64 bits integers.
|
||||
|
||||
#ifndef _CBYTESEX_H
|
||||
#define _CBYTESEX_H
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
#include <sys/types.h>
|
||||
#include <assert.h>
|
||||
|
||||
static inline uint8_t
|
||||
extractBit(uint32_t u32, uint8_t bitNr) {
|
||||
return (u32 >> bitNr) & 1;
|
||||
}
|
||||
|
||||
static inline uint32_t
|
||||
extractBits(uint32_t u32, uint8_t firstBit, uint8_t numBits) {
|
||||
uint32_t temp = (uint32_t) (u32 << (32 - (numBits + firstBit)));
|
||||
// Shift out the unneeded high bits.
|
||||
return temp >> (32 - numBits);
|
||||
// Shift out the unneeded low bits.
|
||||
}
|
||||
|
||||
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
static inline uint32_t
|
||||
highU32(uint64_t u64) {
|
||||
return (uint32_t) (u64 >> 32);
|
||||
}
|
||||
|
||||
static inline uint32_t
|
||||
lowU32(uint64_t u64) {
|
||||
return (uint32_t) u64;
|
||||
}
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
static inline uint16_t
|
||||
highU16(uint32_t u32) {
|
||||
return (uint16_t) (u32 >> 16);
|
||||
}
|
||||
|
||||
static inline uint16_t
|
||||
lowU16(uint32_t u32) {
|
||||
return (uint16_t) u32;
|
||||
}
|
||||
|
||||
static inline uint8_t
|
||||
highU8(uint16_t u16) {
|
||||
return (uint8_t) (u16 >> 8);
|
||||
}
|
||||
|
||||
static inline uint8_t
|
||||
lowU8(uint16_t u16) {
|
||||
return (uint8_t) u16;
|
||||
}
|
||||
|
||||
static inline uint8_t
|
||||
highU4(uint8_t u8) {
|
||||
return u8 >> 4;
|
||||
}
|
||||
|
||||
static inline uint8_t
|
||||
lowU4(uint8_t u8) {
|
||||
return u8 & 0x0f;
|
||||
}
|
||||
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
static inline uint32_t
|
||||
makeU64(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3,
|
||||
uint8_t b4, uint8_t b5, uint8_t b6, uint8_t b7) {
|
||||
uint16_t w0 = (b1 << 8) | b0;
|
||||
uint16_t w1 = (b3 << 8) | b2;
|
||||
uint16_t w2 = (b5 << 8) | b4;
|
||||
uint16_t w3 = (b7 << 8) | b6;
|
||||
|
||||
uint32_t dw0 = (w1 << 16) | w0;
|
||||
uint32_t dw1 = (w3 << 16) | w2;
|
||||
|
||||
return (dw1 << 32) | dw0;
|
||||
}
|
||||
|
||||
static inline uint64_t
|
||||
makeU64fromU32(uint32_t lo, uint32_t hi) {
|
||||
return (hi << 32) | lo;
|
||||
}
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
static inline uint32_t
|
||||
makeU32(uint8_t lowest, uint8_t low, uint8_t high, uint8_t highest) {
|
||||
return (highest << 24) | (high << 16) | (low << 8) | lowest;
|
||||
}
|
||||
|
||||
static inline uint32_t
|
||||
makeU32fromU16(uint16_t lo, uint16_t hi) {
|
||||
return (hi << 16) | lo;
|
||||
}
|
||||
|
||||
static inline uint16_t
|
||||
makeU16(uint8_t lo, uint8_t hi) {
|
||||
return (hi << 8) | lo;
|
||||
}
|
||||
|
||||
|
||||
static inline uint8_t
|
||||
getU8(const void *ptr) {
|
||||
return ((const uint8_t *) ptr)[0];
|
||||
}
|
||||
|
||||
static inline uint16_t
|
||||
getU16BE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[0] << 8) | bytePtr[1];
|
||||
}
|
||||
|
||||
static inline uint16_t
|
||||
getU16LE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[1] << 8) | bytePtr[0];
|
||||
}
|
||||
|
||||
static inline uint32_t
|
||||
getU32BE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[0] << 24) | (bytePtr[1] << 16) |
|
||||
(bytePtr[2] << 8) | bytePtr[3];
|
||||
}
|
||||
|
||||
static inline uint32_t
|
||||
getU32LE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[3] << 24) | (bytePtr[2] << 16) |
|
||||
(bytePtr[1] << 8) | bytePtr[0];
|
||||
}
|
||||
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
static inline uint64_t
|
||||
getU64BE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[0] << 56) | (bytePtr[1] << 48) |
|
||||
(bytePtr[2] << 40) | (bytePtr[3] << 32);
|
||||
(bytePtr[4] << 24) | (bytePtr[5] << 16) |
|
||||
(bytePtr[6] << 8) | bytePtr[7];
|
||||
}
|
||||
|
||||
static inline uint64_t
|
||||
getU64LE(const void *ptr) {
|
||||
const uint8_t *bytePtr = (const uint8_t *) ptr;
|
||||
return (bytePtr[7] << 56) | (bytePtr[6] << 48) |
|
||||
(bytePtr[5] << 40) | (bytePtr[4] << 32);
|
||||
(bytePtr[3] << 24) | (bytePtr[2] << 16) |
|
||||
(bytePtr[1] << 8) | bytePtr[0];
|
||||
}
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
|
||||
#define MAKE_SIGNED_GET_FUNC(suffix, bits) \
|
||||
static inline int##bits##_t \
|
||||
getS##suffix(const void *ptr) { \
|
||||
uint##bits##_t result = getU##suffix(ptr); \
|
||||
return *((int##bits##_t *) &result); \
|
||||
}
|
||||
|
||||
#define MAKE_EAT_FUNC(suffix, type, byteCount) \
|
||||
static inline type \
|
||||
eat##suffix(const void **ptr) { \
|
||||
type result = get##suffix(*ptr); \
|
||||
*ptr = (const void *) ((const uint8_t *) *ptr + byteCount); \
|
||||
return result; \
|
||||
}
|
||||
|
||||
// The order is important; the dependencies need to be put first for
|
||||
// inlining to work (at least for GCC).
|
||||
MAKE_SIGNED_GET_FUNC(8, 8)
|
||||
MAKE_SIGNED_GET_FUNC(16BE, 16)
|
||||
MAKE_SIGNED_GET_FUNC(16LE, 16)
|
||||
MAKE_SIGNED_GET_FUNC(32BE, 32)
|
||||
MAKE_SIGNED_GET_FUNC(32LE, 32)
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
MAKE_SIGNED_GET_FUNC(64BE, 64)
|
||||
MAKE_SIGNED_GET_FUNC(64LE, 64)
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
MAKE_EAT_FUNC(U8, uint8_t, 1)
|
||||
MAKE_EAT_FUNC(U16BE, uint16_t, 2)
|
||||
MAKE_EAT_FUNC(U16LE, uint16_t, 2)
|
||||
MAKE_EAT_FUNC(U32BE, uint32_t, 4)
|
||||
MAKE_EAT_FUNC(U32LE, uint32_t, 4)
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
MAKE_EAT_FUNC(U64BE, uint64_t, 8)
|
||||
MAKE_EAT_FUNC(U64LE, uint64_t, 8)
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
MAKE_EAT_FUNC(S8, int8_t, 1)
|
||||
MAKE_EAT_FUNC(S16BE, int16_t, 2)
|
||||
MAKE_EAT_FUNC(S16LE, int16_t, 2)
|
||||
MAKE_EAT_FUNC(S32BE, int32_t, 4)
|
||||
MAKE_EAT_FUNC(S32LE, int32_t, 4)
|
||||
#ifdef WANT_64BITS_BYTESEX
|
||||
MAKE_EAT_FUNC(S64BE, int64_t, 8)
|
||||
MAKE_EAT_FUNC(S64LE, int64_t, 8)
|
||||
#endif /* WANT_64BITS_BYTESEX */
|
||||
|
||||
#undef MAKE_EAT_FUNC
|
||||
#undef MAKE_SIGNED_GET_FUNC
|
||||
|
||||
typedef struct BitStreamContext BitStreamContext;
|
||||
struct BitStreamContext {
|
||||
uint8_t bitBuf;
|
||||
// First entry; fastest too access (if it matters at all)
|
||||
uint8_t bitBufFill;
|
||||
const uint8_t *ptr;
|
||||
const uint8_t *end;
|
||||
bool eof;
|
||||
};
|
||||
|
||||
static inline void
|
||||
BSC_init(BitStreamContext *bsc, const void *ptr, size_t len) {
|
||||
bsc->bitBuf = 0;
|
||||
bsc->bitBufFill = 0;
|
||||
bsc->ptr = (const uint8_t *) ptr;
|
||||
bsc->end = bsc->ptr + len;
|
||||
bsc->eof = 0;
|
||||
}
|
||||
|
||||
static inline bool
|
||||
BSC_haveBit_OPAB(BitStreamContext *bsc) {
|
||||
if (bsc->ptr != bsc->end)
|
||||
return true;
|
||||
if (bsc->bitBufFill != 0)
|
||||
return true;
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline uint8_t
|
||||
BSC_getBit_OPAB(BitStreamContext *bsc) {
|
||||
if (bsc->bitBufFill == 0) {
|
||||
bsc->bitBuf = *bsc->ptr;
|
||||
bsc->ptr++;
|
||||
bsc->bitBufFill = 7;
|
||||
} else {
|
||||
bsc->bitBufFill--;
|
||||
}
|
||||
|
||||
uint8_t result = bsc->bitBuf & 1;
|
||||
bsc->bitBuf >>= 1;
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline bool
|
||||
BSC_haveBits_OPAB(BitStreamContext *bsc, size_t numBits) {
|
||||
size_t bytesLeft = bsc->end - bsc->ptr;
|
||||
return ((bytesLeft << 3) + bsc->bitBufFill >= numBits);
|
||||
}
|
||||
|
||||
// Bit nr in the stream: 76543210 76543210
|
||||
// Bits in the stream: ABCDEFGH IJKLMNOP
|
||||
// Reading 6 bits yields CDEFGH
|
||||
// Reading 4 bits after that yields OPAB
|
||||
static inline uint32_t
|
||||
BSC_getBits_OPAB(BitStreamContext *bsc, size_t numBits) {
|
||||
assert (numBits <= 32);
|
||||
|
||||
uint32_t result = 0;
|
||||
uint8_t gotBits = 0;
|
||||
while (bsc->bitBufFill < numBits) {
|
||||
result |= bsc->bitBuf << gotBits;
|
||||
gotBits += bsc->bitBufFill;
|
||||
numBits -= bsc->bitBufFill;
|
||||
bsc->bitBufFill = 8;
|
||||
bsc->bitBuf = *bsc->ptr;
|
||||
bsc->ptr++;
|
||||
}
|
||||
|
||||
result |= ((uint8_t) (bsc->bitBuf << (8 - numBits)) >> (8 - numBits)) <<
|
||||
gotBits;
|
||||
bsc->bitBuf >>= numBits;
|
||||
bsc->bitBufFill -= numBits;
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline size_t
|
||||
BSC_bitsLeft_OPAB(BitStreamContext *bsc) {
|
||||
size_t bytesLeft = bsc->end - bsc->ptr;
|
||||
return (bytesLeft << 3) + bsc->bitBufFill;
|
||||
}
|
||||
|
||||
#endif /* _CBYTESEX_H */
|
||||
|
||||
|
||||
Reference in New Issue
Block a user