stasis-aries-wal/src/lladd/blobManager.c

#include <string.h>
#include <lladd/transactional.h>
#include "page/raw.h"
#include <assert.h>


void allocBlob(int xid, recordid rid) {
  assert(rid.size>0);
  int pageCount = (rid.size / USABLE_SIZE_OF_PAGE) + ((rid.size % USABLE_SIZE_OF_PAGE) ? 1 : 0);
  long startPage = TpageAllocMany(xid, pageCount);
  blob_record_t rec;
  rec.offset = startPage;
  rec.size = rid.size;
  recordid rid2 = rid;
  rid2.size = BLOB_SLOT;
  Tset(xid, rid2, &rec);
  //  printf("Page start = %d, count = %d, rid.size=%d\n", rec.offset, pageCount, rid.size);
  //  printf("rid = {%d %d %d}\n", rid.page, rid.slot, rid.size);
}

void openBlobStore() {

}

void closeBlobStore() {

}

void readBlob(int xid, Page * p2, recordid rid, byte * buf) {
  int chunk;
  recordid rawRid = rid;
  rawRid.size = BLOB_SLOT;
  byte * pbuf = alloca(PAGE_SIZE);
  blob_record_t rec;
  readRecord(xid, p2, rawRid, &rec);
  
  for(chunk = 0; (chunk+1) * USABLE_SIZE_OF_PAGE < rid.size; chunk++) { 
    TpageGet(xid, rec.offset+chunk, pbuf);
    memcpy(buf + (chunk * USABLE_SIZE_OF_PAGE), pbuf, USABLE_SIZE_OF_PAGE);
  }

  TpageGet(xid, rec.offset+chunk, pbuf);
  memcpy(buf + (chunk * USABLE_SIZE_OF_PAGE), pbuf, rid.size % USABLE_SIZE_OF_PAGE);
  //  printf("Chunk = %d\n", chunk);

}

void writeBlob(int xid, Page * p2, lsn_t lsn, recordid rid, const byte * buf) {
  int chunk;
  recordid rawRid = rid;
  rawRid.size = BLOB_SLOT;
  byte * pbuf = alloca(PAGE_SIZE);
  blob_record_t rec;
  readRecord(xid, p2, rawRid, &rec);
  
  assert(rec.offset);

  for(chunk = 0; (chunk+1) * USABLE_SIZE_OF_PAGE < rid.size; chunk++) { 
    TpageGet(xid, rec.offset+chunk, pbuf);
    memcpy(pbuf, buf + (chunk * USABLE_SIZE_OF_PAGE), USABLE_SIZE_OF_PAGE);
    TpageSet(xid, rec.offset+chunk, pbuf);
  }
  TpageGet(xid, rec.offset+chunk, pbuf);
  memcpy(pbuf, buf + (chunk * USABLE_SIZE_OF_PAGE), rid.size % USABLE_SIZE_OF_PAGE);
  TpageSet(xid, rec.offset+chunk, pbuf);
  //  printf("Write Chunk = %d (%d)\n", chunk, rec.offset+chunk);
  

}

void commitBlobs(int xid) {

}

void abortBlobs(int xid) { 

}