more TDB

source/libs/tdb/src/db/tdbBtree.c

@@ -203,6 +203,34 @@ int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *p
   return 0;
 }
 
+int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen) {
+  SBtCursor    btc;
+  SCell       *pCell;
+  int          cret;
+  SCellDecoder cd;
+
+  tdbBtreeCursor(&btc, pBt);
+
+  tdbBtCursorMoveTo(&btc, pKey, kLen, &cret);
+
+  if (cret) {
+    return cret;
+  }
+
+  pCell = tdbPageGetCell(btc.pPage, btc.idx);
+  tdbBtreeDecodeCell(btc.pPage, pCell, &cd);
+
+  *vLen = cd.vLen;
+  // TODO: here may have memory leak
+  *ppVal = realloc(*ppVal, *vLen);
+  if (*ppVal == NULL) {
+    return -1;
+  }
+
+  memcpy(*ppVal, cd.pVal, cd.vLen);
+  return 0;
+}
+
 static int tdbBtCursorMoveToChild(SBtCursor *pCur, SPgno pgno) {
   int ret;
 

source/libs/tdb/src/db/tdbDb.c

@@ -88,7 +88,6 @@ int tdbDbInsert(STDb *pDb, const void *pKey, int keyLen, const void *pVal, int v
   return 0;
 }
 
-int tdbDbGet(STDb *pDb, const void *pKey, int kLen, void *pVal, int *vLen) {
-  // TODO
-  return 0;
+int tdbDbGet(STDb *pDb, const void *pKey, int kLen, void **ppVal, int *vLen) {
+  return tdbBtreeGet(pDb->pBt, pKey, kLen, ppVal, vLen);
 }

source/libs/tdb/src/inc/tdbBtree.h

@@ -37,6 +37,7 @@ int tdbBtreeOpen(int keyLen, int valLen, SPager *pFile, FKeyComparator kcmpr, SB
 int tdbBtreeClose(SBTree *pBt);
 int tdbBtreeCursor(SBtCursor *pCur, SBTree *pBt);
 int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *pVal, int vLen);
+int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen);
 
 #ifdef __cplusplus
 }

source/libs/tdb/src/inc/tdbDb.h

@@ -26,7 +26,7 @@ int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprF
 int tdbDbClose(STDb *pDb);
 int tdbDbDrop(STDb *pDb);
 int tdbDbInsert(STDb *pDb, const void *pKey, int keyLen, const void *pVal, int valLen);
-int tdbDbGet(STDb *pDb, const void *pKey, int kLen, void *pVal, int *vLen);
+int tdbDbGet(STDb *pDb, const void *pKey, int kLen, void **ppVal, int *vLen);
 
 #ifdef __cplusplus
 }

source/libs/tdb/test/tdbTest.cpp

@@ -37,7 +37,7 @@ TEST(tdb_test, simple_test) {
         sprintf(key, "key%d", i);
         sprintf(val, "value%d", i);
 
-        ret = tdbDbGet(pDb, key, strlen(key), pVal, &vLen);
+        ret = tdbDbGet(pDb, key, strlen(key), &pVal, &vLen);
         GTEST_ASSERT_EQ(ret, 0);
 
         GTEST_ASSERT_EQ(vLen, strlen(val));