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#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include "mmh.h"
enum {
Plnpad = 32,
Cippad = 16,
Cipovh = Plnpad - Cippad,
Bufpad = 32,
Prepsz = 32,
Noncesz = 24,
Hmacsz = 32,
Keysz = 32,
Segidsz = 16,
Avglog = 20,
Maxblk = 2 << 20,
Entrysz = Hmacsz + 8,
Lvlcap = Maxblk / Entrysz,
Magicsz = 8,
Segmetasz1 = 8 + 8 + 8 + 128,
Segmetasz2 = 8 + 8,
Seghdsz = Magicsz + Keysz + Cipovh,
Segitemsz = Hmacsz + 4,
Permf = 0666,
Permd = 0777,
};
typedef unsigned char uchar;
typedef unsigned int uint;
typedef long long vlong;
typedef unsigned long long uvlong;
typedef struct Addr Addr;
typedef struct Arch Arch;
typedef struct Block Block;
typedef struct Cache Cache;
typedef struct Cachemeta Cachemeta;
typedef struct Chunker Chunker;
typedef struct Entry Entry;
typedef struct Key Key;
typedef struct Level Level;
typedef struct Loghd Loghd;
typedef struct Reader Reader;
typedef struct Segfile Segfile;
typedef struct Segctx Segctx;
typedef struct Segmeta Segmeta;
typedef struct Slice Slice;
typedef struct Writer Writer;
typedef uchar hmac_t[Hmacsz];
typedef int flushcb(void *, hmac_t, Slice);
typedef int blockcb(Block *, hmac_t, Segctx *, void *);
struct Slice {
uchar *buf;
long len;
};
struct Key {
uchar *hmac;
uchar *pub;
uchar *sec;
};
struct Block {
int seg;
int len; /* length of the block in the segment
excluding the cipher overhead */
vlong off;
char lz4;
};
struct Cachemeta {
uchar magic[4];
int nseg;
};
struct Cache {
Cachemeta *meta;
Mmh hash; /* maps hmac to Block */
};
struct Entry {
hmac_t hmac;
vlong len;
};
struct Level {
int nent;
Entry ent[Lvlcap];
};
struct Segctx {
uchar prep[Prepsz];
int metasz;
};
struct Reader {
Arch *arch;
vlong pos;
vlong pos1;
hmac_t hmac0; /* hmac of level[0] */
Level level[2];
/* open segment */
Segctx segc;
FILE *segf;
int segno;
};
struct Writer {
flushcb *flush;
void *arg;
int bpos; /* position in buf[] */
uint rhash;
vlong vlen;
vlong vlen0;
Level level[2];
uchar buf[Bufpad + 2*Maxblk];
};
struct Segmeta {
vlong nitem;
vlong dlen;
};
struct Segfile {
uchar id[Segidsz];
char here;
};
struct Loghd {
uchar segk[Keysz];
uchar segp[Prepsz];
vlong nitem;
vlong dlen;
};
struct Arch {
int fd;
Cache cache;
Segfile *seg;
int nseg;
/* stash */
FILE *log;
FILE *data;
Loghd *logh;
Writer writer;
};
struct Addr {
hmac_t hmac;
int level;
};
#define MAKESURE(what, x) _Static_assert(x, #what)
#define min(a, b) ((a) > (b) ? (b) : (a))
/* util.c */
extern FILE *flog;
void logs(char *, ...);
int shex(char *, int, uchar *);
char *hexs(uchar *, int);
char *segs(uchar[Segidsz]);
char *hmacs(hmac_t);
void hmaccpy(hmac_t, hmac_t);
FILE *fopenat(int, int, char *, ...);
int flushsync(FILE *);
void enc32be(uchar *, uvlong);
void enc32le(uchar *, uvlong);
void enc64be(uchar *, uvlong);
uvlong dec32be(uchar *);
uvlong dec32le(uchar *);
uvlong dec64be(uchar *);
void encmeta(Slice *, Segmeta *);
void decmeta(Slice, Segmeta *);
void encitem(uchar *, hmac_t, int, long);
void decitem(uchar *, Block *);
void addentry(Level *, hmac_t, vlong);
void enclevel(Slice *, Level *);
int declevel(Slice, Level *);
/* slice.c */
Slice mksl(uchar *, long);
Slice newsl();
void freesl(Slice);
void sldeflate(Slice *, Slice);
int slinflate(Slice *, Slice);
void slencrypt(Slice *, Slice, uchar[Prepsz], vlong);
int decrypt(Slice *, FILE *, long, uchar[Prepsz], vlong);
void slhmac(Slice, hmac_t);
int slwrite(Slice, FILE *);
int slread(Slice *, long, FILE *);
/* key.c */
extern Key key;
void keygen(void);
void keydump(void);
int keywrite(char *, long, FILE *);
char *keyreadpub(FILE *);
char *keyreadsec(char *, long, FILE *);
/* cache.c */
int cinit(Cache *, int, char *, int);
void creset(Cache *);
int csync(Cache *);
int cput(Cache *, hmac_t, Block *);
int cputseg(Cache *, uchar[Segidsz], int);
int cget(Cache *, hmac_t, Block *);
int cgetseg(Cache *, uchar[Segidsz], int *);
void cdumphashes(Cache *, int);
void cfree(Cache *);
/* arch.c */
extern uchar segmagic2[Magicsz];
int archinit(Arch *, char *);
void archsync(Arch *);
int archhas(Arch *, hmac_t);
void readerinit(Reader *, Arch *);
int readerstart(Reader *, Addr *, vlong);
void readerdone(Reader *);
int readerseek(Reader *, vlong);
int reader(Reader *, Slice *);
int walkblocks(FILE *, blockcb, void *);
/* stash.c */
int stashinit(Arch *);
int stashadd(Arch *, uchar *, vlong);
int stashblk(Arch *, hmac_t, int, Slice);
int stashdone(Arch *, Addr *);
int stashsync(Arch *);
int stashcommit(Arch *, uchar[Segidsz]);
/* write.c */
void writerinit(Writer *, flushcb *, void *);
int writer(Writer *, uchar *, vlong);
int writerdone(Writer *, Addr *);
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