ref: 63f9a4fda36f916e543c8f3ea117b31c194a4db7
dir: /sys/src/liboventi/pack.c/
#include <u.h> #include <libc.h> #include <oventi.h> /* * integer conversion routines */ #define U8GET(p) ((p)[0]) #define U16GET(p) (((p)[0]<<8)|(p)[1]) #define U32GET(p) ((u32int)(((p)[0]<<24)|((p)[1]<<16)|((p)[2]<<8)|(p)[3])) #define U48GET(p) (((vlong)U16GET(p)<<32)|(vlong)U32GET((p)+2)) #define U64GET(p) (((vlong)U32GET(p)<<32)|(vlong)U32GET((p)+4)) #define U8PUT(p,v) (p)[0]=(v) #define U16PUT(p,v) (p)[0]=(v)>>8;(p)[1]=(v) #define U32PUT(p,v) (p)[0]=(v)>>24;(p)[1]=(v)>>16;(p)[2]=(v)>>8;(p)[3]=(v) #define U48PUT(p,v,t32) t32=(v)>>32;U16PUT(p,t32);t32=(v);U32PUT((p)+2,t32) #define U64PUT(p,v,t32) t32=(v)>>32;U32PUT(p,t32);t32=(v);U32PUT((p)+4,t32) static int checkSize(int n) { if(n < 256 || n > VtMaxLumpSize) { vtSetError("bad block size"); return 0; } return 1; } void vtRootPack(VtRoot *r, uchar *p) { uchar *op = p; U16PUT(p, r->version); p += 2; memmove(p, r->name, sizeof(r->name)); p += sizeof(r->name); memmove(p, r->type, sizeof(r->type)); p += sizeof(r->type); memmove(p, r->score, VtScoreSize); p += VtScoreSize; U16PUT(p, r->blockSize); p += 2; memmove(p, r->prev, VtScoreSize); p += VtScoreSize; assert(p-op == VtRootSize); } int vtRootUnpack(VtRoot *r, uchar *p) { uchar *op = p; memset(r, 0, sizeof(*r)); r->version = U16GET(p); if(r->version != VtRootVersion) { vtSetError("unknown root version"); return 0; } p += 2; memmove(r->name, p, sizeof(r->name)); r->name[sizeof(r->name)-1] = 0; p += sizeof(r->name); memmove(r->type, p, sizeof(r->type)); r->type[sizeof(r->type)-1] = 0; p += sizeof(r->type); memmove(r->score, p, VtScoreSize); p += VtScoreSize; r->blockSize = U16GET(p); if(!checkSize(r->blockSize)) return 0; p += 2; memmove(r->prev, p, VtScoreSize); p += VtScoreSize; assert(p-op == VtRootSize); return 1; } void vtEntryPack(VtEntry *e, uchar *p, int index) { ulong t32; int flags; uchar *op; p += index * VtEntrySize; op = p; U32PUT(p, e->gen); p += 4; U16PUT(p, e->psize); p += 2; U16PUT(p, e->dsize); p += 2; flags = e->flags | ((e->depth << VtEntryDepthShift) & VtEntryDepthMask); U8PUT(p, flags); p++; memset(p, 0, 5); p += 5; U48PUT(p, e->size, t32); p += 6; memmove(p, e->score, VtScoreSize); p += VtScoreSize; assert(p-op == VtEntrySize); } int vtEntryUnpack(VtEntry *e, uchar *p, int index) { uchar *op; p += index * VtEntrySize; op = p; e->gen = U32GET(p); p += 4; e->psize = U16GET(p); p += 2; e->dsize = U16GET(p); p += 2; e->flags = U8GET(p); e->depth = (e->flags & VtEntryDepthMask) >> VtEntryDepthShift; e->flags &= ~VtEntryDepthMask; p++; p += 5; e->size = U48GET(p); p += 6; memmove(e->score, p, VtScoreSize); p += VtScoreSize; assert(p-op == VtEntrySize); if(!(e->flags & VtEntryActive)) return 1; if(!checkSize(e->psize) || !checkSize(e->dsize)) return 0; return 1; }