-#include "hash.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+//dbg
+#include <stdio.h>
+#include "libcitadel.h"
+#include "lookup3.h"
+typedef struct Payload Payload;
-typedef struct HashList {
- void *Members;
- long nMembersUsed;
- long MemberSize;
-
+/**
+ * @brief Hash Payload storage Structure; filled in linear.
+ */
+struct Payload {
+ void *Data; /**< the Data belonging to this storage */
+ DeleteHashDataFunc Destructor; /**< if we want to destroy Data, do it with this function. */
+};
+
+
+/**
+ * @brief Hash key element; sorted by key
+ */
+struct HashKey {
+ long Key; /**< Numeric Hashkey comperator for hash sorting */
+ long Position; /**< Pointer to a Payload struct in the Payload Aray */
+ char *HashKey; /**< the Plaintext Hashkey */
+ long HKLen; /**< length of the Plaintext Hashkey */
+ Payload *PL; /**< pointer to our payload for sorting */
};
-typedef struct Payload {
- void *Data;
- char *HashKey;
- DeleteHashDataFunc Destructor;
+/**
+ * @brief Hash structure; holds arrays of Hashkey and Payload.
+ */
+struct HashList {
+ Payload **Members; /**< Our Payload members. This fills up linear */
+ HashKey **LookupTable; /**< Hash Lookup table. Elements point to members, and are sorted by their hashvalue */
+ char **MyKeys; /**< this keeps the members for a call of GetHashKeys */
+ HashFunc Algorithm; /**< should we use an alternating algorithm to calc the hash values? */
+ long nMembersUsed; /**< how many pointers inside of the array are used? */
+ long nLookupTableItems; /**< how many items of the lookup table are used? */
+ long MemberSize; /**< how big is Members and LookupTable? */
+ long tainted; /**< if 0, we're hashed, else s.b. else sorted us in his own way. */
+ long uniq; /**< are the keys going to be uniq? */
};
-typedef struct HashKey {
- long Key;
- long Position;
+/**
+ * @brief Anonymous Hash Iterator Object. used for traversing the whole array from outside
+ */
+struct HashPos {
+ long Position; /**< Position inside of the hash */
+ int StepWidth; /**< small? big? forward? backward? */
};
-int GetHash(HashList *Hash, char *HKey, void **Payload)
+/**
+ * @brief Iterate over the hash and call PrintEntry.
+ * @param Hash your Hashlist structure
+ * @param Trans is called so you could for example print 'A:' if the next entries are like that.
+ * Must be aware to receive NULL in both pointers.
+ * @param PrintEntry print entry one by one
+ * \returns the number of items printed
+ */
+int PrintHash(HashList *Hash, TransitionFunc Trans, PrintHashDataFunc PrintEntry)
+{
+ int i;
+ void *Previous;
+ void *Next;
+ const char* KeyStr;
+
+ if (Hash == NULL)
+ return 0;
+
+ for (i=0; i < Hash->nLookupTableItems; i++) {
+ if (i==0) {
+ Previous = NULL;
+ }
+ else {
+ if (Hash->LookupTable[i - 1] == NULL)
+ Previous = NULL;
+ else
+ Previous = Hash->Members[Hash->LookupTable[i-1]->Position]->Data;
+ }
+ if (Hash->LookupTable[i] == NULL) {
+ KeyStr = "";
+ Next = NULL;
+ }
+ else {
+ Next = Hash->Members[Hash->LookupTable[i]->Position]->Data;
+ KeyStr = Hash->LookupTable[i]->HashKey;
+ }
+
+ Trans(Previous, Next, i % 2);
+ PrintEntry(KeyStr, Next, i % 2);
+ }
+ return i;
+}
+
+
+/**
+ * @brief verify the contents of a hash list; here for debugging purposes.
+ * @param Hash your Hashlist structure
+ * @param First Functionpointer to allow you to print your payload
+ * @param Second Functionpointer to allow you to print your payload
+ * \returns 0
+ */
+int dbg_PrintHash(HashList *Hash, PrintHashContent First, PrintHashContent Second)
+{
+ const char *foo;
+ const char *bar;
+ const char *bla = "";
+ long key;
+ long i;
+
+ if (Hash == NULL)
+ return 0;
+
+ if (Hash->MyKeys != NULL)
+ free (Hash->MyKeys);
+
+ Hash->MyKeys = (char**) malloc(sizeof(char*) * Hash->nLookupTableItems);
+#ifdef DEBUG
+ printf("----------------------------------\n");
+#endif
+ for (i=0; i < Hash->nLookupTableItems; i++) {
+
+ if (Hash->LookupTable[i] == NULL)
+ {
+ foo = "";
+ bar = "";
+ key = 0;
+ }
+ else
+ {
+ key = Hash->LookupTable[i]->Key;
+ foo = Hash->LookupTable[i]->HashKey;
+ if (First != NULL)
+ bar = First(Hash->Members[Hash->LookupTable[i]->Position]->Data);
+ else
+ bar = "";
+ if (Second != NULL)
+ bla = Second(Hash->Members[Hash->LookupTable[i]->Position]->Data);
+ else
+ bla = "";
+ }
+#ifdef DEBUG
+ printf (" ---- Hashkey[%ld][%ld]: '%s' Value: '%s' ; %s\n", i, key, foo, bar, bla);
+#endif
+ }
+#ifdef DEBUG
+ printf("----------------------------------\n");
+#endif
+ return 0;
+}
+
+
+/**
+ * @brief instanciate a new hashlist
+ * \returns the newly allocated list.
+ */
+HashList *NewHash(int Uniq, HashFunc F)
+{
+ HashList *NewList;
+ NewList = malloc (sizeof(HashList));
+ memset(NewList, 0, sizeof(HashList));
+
+ NewList->Members = malloc(sizeof(Payload*) * 100);
+ memset(NewList->Members, 0, sizeof(Payload*) * 100);
+
+ NewList->LookupTable = malloc(sizeof(HashKey*) * 100);
+ memset(NewList->LookupTable, 0, sizeof(HashKey*) * 100);
+
+ NewList->MemberSize = 100;
+ NewList->tainted = 0;
+ NewList->uniq = Uniq;
+ NewList->Algorithm = F;
+
+ return NewList;
+}
+
+int GetCount(HashList *Hash)
+{
+ if(Hash==NULL) return 0;
+ return Hash->nLookupTableItems;
+}
+
+
+/**
+ * @brief private destructor for one hash element.
+ * Crashing? go one frame up and do 'print *FreeMe->LookupTable[i]'
+ * @param Data an element to free using the user provided destructor, or just plain free
+ */
+static void DeleteHashPayload (Payload *Data)
+{
+ /** do we have a destructor for our payload? */
+ if (Data->Destructor)
+ Data->Destructor(Data->Data);
+ else
+ free(Data->Data);
+}
+
+/**
+ * @brief Destructor for nested hashes
+ */
+void HDeleteHash(void *vHash)
+{
+ HashList *FreeMe = (HashList*)vHash;
+ DeleteHash(&FreeMe);
+}
+
+/**
+ * @brief destroy a hashlist and all of its members
+ * Crashing? do 'print *FreeMe->LookupTable[i]'
+ * @param Hash Hash to destroy. Is NULL'ed so you are shure its done.
+ */
+void DeleteHash(HashList **Hash)
{
+ int i;
+ HashList *FreeMe;
+
+ FreeMe = *Hash;
+ if (FreeMe == NULL)
+ return;
+ /* even if there are sparse members already deleted... */
+ for (i=0; i < FreeMe->nMembersUsed; i++)
+ {
+ /** get rid of our payload */
+ if (FreeMe->Members[i] != NULL)
+ {
+ DeleteHashPayload(FreeMe->Members[i]);
+ free(FreeMe->Members[i]);
+ }
+ /** delete our hashing data */
+ if (FreeMe->LookupTable[i] != NULL)
+ {
+ free(FreeMe->LookupTable[i]->HashKey);
+ free(FreeMe->LookupTable[i]);
+ }
+ }
+ /** now, free our arrays... */
+ free(FreeMe->LookupTable);
+ free(FreeMe->Members);
+ /** did s.b. want an array of our keys? free them. */
+ if (FreeMe->MyKeys != NULL)
+ free(FreeMe->MyKeys);
+ /** buye bye cruel world. */
+ free (FreeMe);
+ *Hash = NULL;
}
-void Put(HashList *Hash, char *HKey, long HKLen, void *Payload, DeleteHashDataFunc DeleteIt)
+/**
+ * @brief Private function to increase the hash size.
+ * @param Hash the Hasharray to increase
+ */
+static void IncreaseHashSize(HashList *Hash)
{
+ /* Ok, Our space is used up. Double the available space. */
+ Payload **NewPayloadArea;
+ HashKey **NewTable;
+
+ if (Hash == NULL)
+ return ;
+
+ /** If we grew to much, this might be the place to rehash and shrink again.
+ if ((Hash->NMembersUsed > Hash->nLookupTableItems) &&
+ ((Hash->NMembersUsed - Hash->nLookupTableItems) >
+ (Hash->nLookupTableItems / 10)))
+ {
+
+
+ }
+ */
+
+ /** double our payload area */
+ NewPayloadArea = (Payload**) malloc(sizeof(Payload*) * Hash->MemberSize * 2);
+ memset(&NewPayloadArea[Hash->MemberSize], 0, sizeof(Payload*) * Hash->MemberSize);
+ memcpy(NewPayloadArea, Hash->Members, sizeof(Payload*) * Hash->MemberSize);
+ free(Hash->Members);
+ Hash->Members = NewPayloadArea;
+
+ /** double our hashtable area */
+ NewTable = malloc(sizeof(HashKey*) * Hash->MemberSize * 2);
+ memset(&NewTable[Hash->MemberSize], 0, sizeof(HashKey*) * Hash->MemberSize);
+ memcpy(NewTable, Hash->LookupTable, sizeof(HashKey*) * Hash->MemberSize);
+ free(Hash->LookupTable);
+ Hash->LookupTable = NewTable;
+
+ Hash->MemberSize *= 2;
}
+
+/**
+ * @brief private function to add a new item to / replace an existing in - the hashlist
+ * if the hash list is full, its re-alloced with double size.
+ * \parame Hash our hashlist to manipulate
+ * @param HashPos where should we insert / replace?
+ * @param HashKeyStr the Hash-String
+ * @param HKLen length of HashKeyStr
+ * @param Data your Payload to add
+ * @param Destructor Functionpointer to free Data. if NULL, default free() is used.
+ */
+static void InsertHashItem(HashList *Hash,
+ long HashPos,
+ long HashBinKey,
+ const char *HashKeyStr,
+ long HKLen,
+ void *Data,
+ DeleteHashDataFunc Destructor)
+{
+ Payload *NewPayloadItem;
+ HashKey *NewHashKey;
+
+ if (Hash == NULL)
+ return;
+
+ if (Hash->nMembersUsed >= Hash->MemberSize)
+ IncreaseHashSize (Hash);
+
+ /** Arrange the payload */
+ NewPayloadItem = (Payload*) malloc (sizeof(Payload));
+ NewPayloadItem->Data = Data;
+ NewPayloadItem->Destructor = Destructor;
+ /** Arrange the hashkey */
+ NewHashKey = (HashKey*) malloc (sizeof(HashKey));
+ NewHashKey->HashKey = (char *) malloc (HKLen + 1);
+ NewHashKey->HKLen = HKLen;
+ memcpy (NewHashKey->HashKey, HashKeyStr, HKLen + 1);
+ NewHashKey->Key = HashBinKey;
+ NewHashKey->PL = NewPayloadItem;
+ /** our payload is queued at the end... */
+ NewHashKey->Position = Hash->nMembersUsed;
+ /** but if we should be sorted into a specific place... */
+ if ((Hash->nLookupTableItems != 0) &&
+ (HashPos != Hash->nLookupTableItems) ) {
+ long ItemsAfter;
+
+ ItemsAfter = Hash->nLookupTableItems - HashPos;
+ /** make space were we can fill us in */
+ if (ItemsAfter > 0)
+ {
+ memmove(&Hash->LookupTable[HashPos + 1],
+ &Hash->LookupTable[HashPos],
+ ItemsAfter * sizeof(HashKey*));
+ }
+ }
+
+ Hash->Members[Hash->nMembersUsed] = NewPayloadItem;
+ Hash->LookupTable[HashPos] = NewHashKey;
+ Hash->nMembersUsed++;
+ Hash->nLookupTableItems++;
+}
+
+/**
+ * @brief if the user has tainted the hash, but wants to insert / search items by their key
+ * we need to search linear through the array. You have been warned that this will take more time!
+ * @param Hash Our Hash to manipulate
+ * @param HashBinKey the Hash-Number to lookup.
+ * \returns the position (most closely) matching HashBinKey (-> Caller needs to compare! )
+ */
+static long FindInTaintedHash(HashList *Hash, long HashBinKey)
+{
+ long SearchPos;
+
+ if (Hash == NULL)
+ return 0;
+
+ for (SearchPos = 0; SearchPos < Hash->nLookupTableItems; SearchPos ++) {
+ if (Hash->LookupTable[SearchPos]->Key == HashBinKey){
+ return SearchPos;
+ }
+ }
+ return SearchPos;
+}
+
+/**
+ * @brief Private function to lookup the Item / the closest position to put it in
+ * @param Hash Our Hash to manipulate
+ * @param HashBinKey the Hash-Number to lookup.
+ * \returns the position (most closely) matching HashBinKey (-> Caller needs to compare! )
+ */
+static long FindInHash(HashList *Hash, long HashBinKey)
+{
+ long SearchPos;
+ long StepWidth;
+
+ if (Hash == NULL)
+ return 0;
+
+ if (Hash->tainted)
+ return FindInTaintedHash(Hash, HashBinKey);
+
+ SearchPos = Hash->nLookupTableItems / 2;
+ StepWidth = SearchPos / 2;
+ while ((SearchPos > 0) &&
+ (SearchPos < Hash->nLookupTableItems))
+ {
+ /** Did we find it? */
+ if (Hash->LookupTable[SearchPos]->Key == HashBinKey){
+ return SearchPos;
+ }
+ /** are we Aproximating in big steps? */
+ if (StepWidth > 1){
+ if (Hash->LookupTable[SearchPos]->Key > HashBinKey)
+ SearchPos -= StepWidth;
+ else
+ SearchPos += StepWidth;
+ StepWidth /= 2;
+ }
+ else { /** We are right next to our target, within 4 positions */
+ if (Hash->LookupTable[SearchPos]->Key > HashBinKey) {
+ if ((SearchPos > 0) &&
+ (Hash->LookupTable[SearchPos - 1]->Key < HashBinKey))
+ return SearchPos;
+ SearchPos --;
+ }
+ else {
+ if ((SearchPos + 1 < Hash->nLookupTableItems) &&
+ (Hash->LookupTable[SearchPos + 1]->Key > HashBinKey))
+ return SearchPos;
+ SearchPos ++;
+ }
+ StepWidth--;
+ }
+ }
+ return SearchPos;
+}
+
+
+/**
+ * @brief another hashing algorithm; treat it as just a pointer to long.
+ * @param str Our pointer to the long value
+ * @param len the length of the data pointed to; needs to be sizeof int, else we won't use it!
+ * \returns the calculated hash value
+ */
+int Flathash(const char *str, long len)
+{
+ if (len != sizeof (int))
+ return 0;
+ else return *(int*)str;
+}
+
+/**
+ * @brief private abstract wrapper around the hashing algorithm
+ * @param HKey the hash string
+ * @param HKLen length of HKey
+ * \returns the calculated hash value
+ */
+inline static long CalcHashKey (HashList *Hash, const char *HKey, long HKLen)
+{
+ if (Hash == NULL)
+ return 0;
+
+ if (Hash->Algorithm == NULL)
+ return hashlittle(HKey, HKLen, 9283457);
+ else
+ return Hash->Algorithm(HKey, HKLen);
+}
+
+
+/**
+ * @brief Add a new / Replace an existing item in the Hash
+ * @param HashList the list to manipulate
+ * @param HKey the hash-string to store Data under
+ * @param HKeyLen Length of HKey
+ * @param Data the payload you want to associate with HKey
+ * @param DeleteIt if not free() should be used to delete Data set to NULL, else DeleteIt is used.
+ */
+void Put(HashList *Hash, const char *HKey, long HKLen, void *Data, DeleteHashDataFunc DeleteIt)
+{
+ long HashBinKey;
+ long HashAt;
+
+ if (Hash == NULL)
+ return;
+
+ /** first, find out were we could fit in... */
+ HashBinKey = CalcHashKey(Hash, HKey, HKLen);
+ HashAt = FindInHash(Hash, HashBinKey);
+
+ if (HashAt >= Hash->MemberSize)
+ IncreaseHashSize (Hash);
+
+ /** oh, we're brand new... */
+ if (Hash->LookupTable[HashAt] == NULL) {
+ InsertHashItem(Hash, HashAt, HashBinKey, HKey, HKLen, Data, DeleteIt);
+ }/** Insert After? */
+ else if (Hash->LookupTable[HashAt]->Key > HashBinKey) {
+ InsertHashItem(Hash, HashAt, HashBinKey, HKey, HKLen, Data, DeleteIt);
+ }/** Insert before? */
+ else if (Hash->LookupTable[HashAt]->Key < HashBinKey) {
+ InsertHashItem(Hash, HashAt + 1, HashBinKey, HKey, HKLen, Data, DeleteIt);
+ }
+ else { /** Ok, we have a colision. replace it. */
+ if (Hash->uniq) {
+ long PayloadPos;
+
+ PayloadPos = Hash->LookupTable[HashAt]->Position;
+ DeleteHashPayload(Hash->Members[PayloadPos]);
+ Hash->Members[PayloadPos]->Data = Data;
+ Hash->Members[PayloadPos]->Destructor = DeleteIt;
+ }
+ else {
+ InsertHashItem(Hash, HashAt + 1, HashBinKey, HKey, HKLen, Data, DeleteIt);
+ }
+ }
+}
+
+/**
+ * @brief Lookup the Data associated with HKey
+ * @param Hash the Hashlist to search in
+ * @param HKey the hashkey to look up
+ * @param HKLen length of HKey
+ * @param Data returns the Data associated with HKey
+ * \returns 0 if not found, 1 if.
+ */
+int GetHash(HashList *Hash, const char *HKey, long HKLen, void **Data)
+{
+ long HashBinKey;
+ long HashAt;
+
+ if (Hash == NULL)
+ return 0;
+
+ if (HKLen <= 0) {
+ *Data = NULL;
+ return 0;
+ }
+ /** first, find out were we could be... */
+ HashBinKey = CalcHashKey(Hash, HKey, HKLen);
+ HashAt = FindInHash(Hash, HashBinKey);
+ if ((HashAt < 0) || /**< Not found at the lower edge? */
+ (HashAt >= Hash->nLookupTableItems) || /**< Not found at the upper edge? */
+ (Hash->LookupTable[HashAt]->Key != HashBinKey)) { /**< somewhere inbetween but no match? */
+ *Data = NULL;
+ return 0;
+ }
+ else { /** GOTCHA! */
+ long MemberPosition;
+
+ MemberPosition = Hash->LookupTable[HashAt]->Position;
+ *Data = Hash->Members[MemberPosition]->Data;
+ return 1;
+ }
+}
+
+/* TODO? */
int GetKey(HashList *Hash, char *HKey, long HKLen, void **Payload)
{
+ return 0;
+}
+
+/**
+ * @brief get the Keys present in this hash, simila to array_keys() in PHP
+ * Attention: List remains to Hash! don't modify or free it!
+ * @param Hash Your Hashlist to extract the keys from
+ * @param List returns the list of hashkeys stored in Hash
+ */
+int GetHashKeys(HashList *Hash, char ***List)
+{
+ long i;
+ if (Hash == NULL)
+ return 0;
+ if (Hash->MyKeys != NULL)
+ free (Hash->MyKeys);
+
+ Hash->MyKeys = (char**) malloc(sizeof(char*) * Hash->nLookupTableItems);
+ for (i=0; i < Hash->nLookupTableItems; i++) {
+
+ Hash->MyKeys[i] = Hash->LookupTable[i]->HashKey;
+ }
+ *List = (char**)Hash->MyKeys;
+ return Hash->nLookupTableItems;
+}
+
+/**
+ * @brief creates a hash-linear iterator object
+ * @param Hash the list we reference
+ * @param in which step width should we iterate?
+ * If negative, the last position matching the
+ * step-raster is provided.
+ * \returns the hash iterator
+ */
+HashPos *GetNewHashPos(HashList *Hash, int StepWidth)
+{
+ HashPos *Ret;
+
+ Ret = (HashPos*)malloc(sizeof(HashPos));
+ if (StepWidth != 0)
+ Ret->StepWidth = StepWidth;
+ else
+ Ret->StepWidth = 1;
+ if (Ret->StepWidth < 0) {
+ Ret->Position = Hash->nLookupTableItems - 1;
+ }
+ else {
+ Ret->Position = 0;
+ }
+ return Ret;
+}
+
+/**
+ * @brief Set iterator object to point to key. If not found, don't change iterator
+ * @param Hash the list we reference
+ * @param HKey key to search for
+ * @param HKLen length of key
+ * @param At HashPos to update
+ * \returns 0 if not found
+ */
+int GetHashPosFromKey(HashList *Hash, const char *HKey, long HKLen, HashPos *At)
+{
+ long HashBinKey;
+ long HashAt;
+
+ if (Hash == NULL)
+ return 0;
+
+ if (HKLen <= 0) {
+ return 0;
+ }
+ /** first, find out were we could be... */
+ HashBinKey = CalcHashKey(Hash, HKey, HKLen);
+ HashAt = FindInHash(Hash, HashBinKey);
+ if ((HashAt < 0) || /**< Not found at the lower edge? */
+ (HashAt >= Hash->nLookupTableItems) || /**< Not found at the upper edge? */
+ (Hash->LookupTable[HashAt]->Key != HashBinKey)) { /**< somewhere inbetween but no match? */
+ return 0;
+ }
+ /** GOTCHA! */
+ At->Position = Hash->LookupTable[HashAt]->Position;
+ return 1;
+}
+
+/**
+ * @brief Delete from the Hash the entry at Position
+ * @param Hash the list we reference
+ * @param At the position within the Hash
+ * \returns 0 if not found
+ */
+int DeleteEntryFromHash(HashList *Hash, HashPos *At)
+{
+ Payload *FreeMe;
+ if (Hash == NULL)
+ return 0;
+
+ /* if lockable, lock here */
+ if ((Hash == NULL) ||
+ (At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems))
+ {
+ /* unlock... */
+ return 0;
+ }
+
+ FreeMe = Hash->Members[Hash->LookupTable[At->Position]->Position];
+ Hash->Members[Hash->LookupTable[At->Position]->Position] = NULL;
+
+
+ /** delete our hashing data */
+ if (Hash->LookupTable[At->Position] != NULL)
+ {
+ free(Hash->LookupTable[At->Position]->HashKey);
+ free(Hash->LookupTable[At->Position]);
+ if (At->Position < Hash->nLookupTableItems)
+ {
+ memmove(&Hash->LookupTable[At->Position],
+ &Hash->LookupTable[At->Position + 1],
+ (Hash->nLookupTableItems - At->Position - 1) *
+ sizeof(HashKey*));
+
+ Hash->LookupTable[Hash->nLookupTableItems - 1] = NULL;
+ }
+ else
+ Hash->LookupTable[At->Position] = NULL;
+ Hash->nLookupTableItems--;
+ }
+ /* unlock... */
+
+
+ /** get rid of our payload */
+ if (FreeMe != NULL)
+ {
+ DeleteHashPayload(FreeMe);
+ free(FreeMe);
+ }
+ return 1;
+}
+
+/**
+ * @brief retrieve the counter from the itteratoor
+ * @param the Iterator to analyze
+ * \returns the n'th hashposition we point at
+ */
+int GetHashPosCounter(HashList *Hash, HashPos *At)
+{
+ if ((Hash == NULL) ||
+ (At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems))
+ return 0;
+ return At->Position;
+}
+
+/**
+ * @brief frees a linear hash iterator
+ */
+void DeleteHashPos(HashPos **DelMe)
+{
+ if (*DelMe != NULL)
+ {
+ free(*DelMe);
+ *DelMe = NULL;
+ }
+}
+
+
+/**
+ * @brief Get the data located where HashPos Iterator points at, and Move HashPos one forward
+ * @param Hash your Hashlist to follow
+ * @param At the position to retrieve the Item from and move forward afterwards
+ * @param HKLen returns Length of Hashkey Returned
+ * @param HashKey returns the Hashkey corrosponding to HashPos
+ * @param Data returns the Data found at HashPos
+ * \returns whether the item was found or not.
+ */
+int GetNextHashPos(HashList *Hash, HashPos *At, long *HKLen, const char **HashKey, void **Data)
+{
+ long PayloadPos;
+
+ if ((Hash == NULL) ||
+ (At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems))
+ return 0;
+ *HKLen = Hash->LookupTable[At->Position]->HKLen;
+ *HashKey = Hash->LookupTable[At->Position]->HashKey;
+ PayloadPos = Hash->LookupTable[At->Position]->Position;
+ *Data = Hash->Members[PayloadPos]->Data;
+
+ /* Position is NULL-Based, while Stepwidth is not... */
+ if ((At->Position % abs(At->StepWidth)) == 0)
+ At->Position += At->StepWidth;
+ else
+ At->Position += ((At->Position) % abs(At->StepWidth)) *
+ (At->StepWidth / abs(At->StepWidth));
+ return 1;
+}
+
+/**
+ * @brief Get the data located where HashPos Iterator points at
+ * @param Hash your Hashlist to follow
+ * @param At the position retrieve the data from
+ * @param HKLen returns Length of Hashkey Returned
+ * @param HashKey returns the Hashkey corrosponding to HashPos
+ * @param Data returns the Data found at HashPos
+ * \returns whether the item was found or not.
+ */
+int GetHashPos(HashList *Hash, HashPos *At, long *HKLen, const char **HashKey, void **Data)
+{
+ long PayloadPos;
+
+ if ((Hash == NULL) ||
+ (At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems))
+ return 0;
+ *HKLen = Hash->LookupTable[At->Position]->HKLen;
+ *HashKey = Hash->LookupTable[At->Position]->HashKey;
+ PayloadPos = Hash->LookupTable[At->Position]->Position;
+ *Data = Hash->Members[PayloadPos]->Data;
+
+ return 1;
}
-int GetHashKeys(HashList *Hash, char **List)
+/**
+ * @brief Move HashPos one forward
+ * @param Hash your Hashlist to follow
+ * @param At the position to move forward
+ * \returns whether there is a next item or not.
+ */
+int NextHashPos(HashList *Hash, HashPos *At)
{
+ if ((Hash == NULL) ||
+ (At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems))
+ return 0;
+
+ /* Position is NULL-Based, while Stepwidth is not... */
+ if ((At->Position % abs(At->StepWidth)) == 0)
+ At->Position += At->StepWidth;
+ else
+ At->Position += ((At->Position) % abs(At->StepWidth)) *
+ (At->StepWidth / abs(At->StepWidth));
+ return !((At->Position >= Hash->nLookupTableItems) ||
+ (At->Position < 0) ||
+ (At->Position > Hash->nLookupTableItems));
+}
+
+/**
+ * @brief Get the data located where At points to
+ * note: you should prefer iterator operations instead of using me.
+ * @param Hash your Hashlist peek from
+ * @param HKLen returns Length of Hashkey Returned
+ * @param HashKey returns the Hashkey corrosponding to HashPos
+ * @param Data returns the Data found at HashPos
+ * \returns whether the item was found or not.
+ */
+int GetHashAt(HashList *Hash,long At, long *HKLen, const char **HashKey, void **Data)
+{
+ long PayloadPos;
+
+ if ((Hash == NULL) ||
+ (At < 0) ||
+ (At > Hash->nLookupTableItems))
+ return 0;
+ *HKLen = Hash->LookupTable[At]->HKLen;
+ *HashKey = Hash->LookupTable[At]->HashKey;
+ PayloadPos = Hash->LookupTable[At]->Position;
+ *Data = Hash->Members[PayloadPos]->Data;
+ return 1;
}
+
+/**
+ * @brief Get the data located where At points to
+ * note: you should prefer iterator operations instead of using me.
+ * @param Hash your Hashlist peek from
+ * @param HKLen returns Length of Hashkey Returned
+ * @param HashKey returns the Hashkey corrosponding to HashPos
+ * @param Data returns the Data found at HashPos
+ * \returns whether the item was found or not.
+ */
+/*
+long GetHashIDAt(HashList *Hash,long At)
+{
+ if ((Hash == NULL) ||
+ (At < 0) ||
+ (At > Hash->nLookupTableItems))
+ return 0;
+
+ return Hash->LookupTable[At]->Key;
+}
+*/
+
+
+/**
+ * @brief sorting function for sorting the Hash alphabeticaly by their strings
+ * @param Key1 first item
+ * @param Key2 second item
+ */
+static int SortByKeys(const void *Key1, const void* Key2)
+{
+ HashKey *HKey1, *HKey2;
+ HKey1 = *(HashKey**) Key1;
+ HKey2 = *(HashKey**) Key2;
+
+ return strcasecmp(HKey1->HashKey, HKey2->HashKey);
+}
+
+/**
+ * @brief sorting function for sorting the Hash alphabeticaly reverse by their strings
+ * @param Key1 first item
+ * @param Key2 second item
+ */
+static int SortByKeysRev(const void *Key1, const void* Key2)
+{
+ HashKey *HKey1, *HKey2;
+ HKey1 = *(HashKey**) Key1;
+ HKey2 = *(HashKey**) Key2;
+
+ return strcasecmp(HKey2->HashKey, HKey1->HashKey);
+}
+
+/**
+ * @brief sorting function to regain hash-sequence and revert tainted status
+ * @param Key1 first item
+ * @param Key2 second item
+ */
+static int SortByHashKeys(const void *Key1, const void* Key2)
+{
+ HashKey *HKey1, *HKey2;
+ HKey1 = *(HashKey**) Key1;
+ HKey2 = *(HashKey**) Key2;
+
+ return HKey1->Key > HKey2->Key;
+}
+
+
+/**
+ * @brief sort the hash alphabeticaly by their keys.
+ * Caution: This taints the hashlist, so accessing it later
+ * will be significantly slower! You can un-taint it by SortByHashKeyStr
+ * @param Hash the list to sort
+ * @param Order 0/1 Forward/Backward
+ */
+void SortByHashKey(HashList *Hash, int Order)
+{
+ if (Hash->nLookupTableItems < 2)
+ return;
+ qsort(Hash->LookupTable, Hash->nLookupTableItems, sizeof(HashKey*),
+ (Order)?SortByKeys:SortByKeysRev);
+ Hash->tainted = 1;
+}
+
+/**
+ * @brief sort the hash by their keys (so it regains untainted state).
+ * this will result in the sequence the hashing allgorithm produces it by default.
+ * @param Hash the list to sort
+ */
+void SortByHashKeyStr(HashList *Hash)
+{
+ Hash->tainted = 0;
+ if (Hash->nLookupTableItems < 2)
+ return;
+ qsort(Hash->LookupTable, Hash->nLookupTableItems, sizeof(HashKey*), SortByHashKeys);
+}
+
+
+/**
+ * @brief gives user sort routines access to the hash payload
+ * @param Searchentry to retrieve Data to
+ * \returns Data belonging to HashVoid
+ */
+const void *GetSearchPayload(const void *HashVoid)
+{
+ return (*(HashKey**)HashVoid)->PL->Data;
+}
+
+/**
+ * @brief sort the hash by your sort function. see the following sample.
+ * this will result in the sequence the hashing allgorithm produces it by default.
+ * @param Hash the list to sort
+ * @param SortBy Sortfunction; see below how to implement this
+ */
+void SortByPayload(HashList *Hash, CompareFunc SortBy)
+{
+ if (Hash->nLookupTableItems < 2)
+ return;
+ qsort(Hash->LookupTable, Hash->nLookupTableItems, sizeof(HashKey*), SortBy);
+ Hash->tainted = 1;
+}
+
+
+
+
+/**
+ * given you've put char * into your hash as a payload, a sort function might
+ * look like this:
+ * int SortByChar(const void* First, const void* Second)
+ * {
+ * char *a, *b;
+ * a = (char*) GetSearchPayload(First);
+ * b = (char*) GetSearchPayload(Second);
+ * return strcmp (a, b);
+ * }
+ */
+
+
+/*
+ * Generic function to free a reference.
+ * since a reference actualy isn't needed to be freed, do nothing.
+ */
+void reference_free_handler(void *ptr)
+{
+ return;
+}
+
+
+/*
+ * This exposes the hashlittle() function to consumers.
+ */
+int HashLittle(const void *key, size_t length) {
+ return (int)hashlittle(key, length, 1);
+}
+
projects / citadel.git / blobdiff