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/* read header from file */ int Spartan_index::read_header() { int i; byte len; DBUG_ENTER("Spartan_index::read_header"); if (block_size == -1) { /* Seek the start of the file. Read the maximum key length value. */ my_seek(index_file, 0l, MY_SEEK_SET, MYF(0)); i = my_read(index_file, &len, sizeof(int), MYF(0)); memcpy(&max_key_len, &len, sizeof(int)); /* Calculate block size as maximum key length plus the size of the key plus the crashed status byte. */ block_size = max_key_len + sizeof(long long) + sizeof(int); i = my_read(index_file, &len, sizeof(bool), MYF(0)); memcpy(&crashed, &len, sizeof(bool)); } else { i = (int)my_seek(index_file, sizeof(int) + sizeof(bool), MY_SEEK_SET, MYF(0)); } DBUG_RETURN(0); } /* write header to file */ int Spartan_index::write_header() { int i; byte len; DBUG_ENTER("Spartan_index::write_header"); if (block_size != -1) { /* Seek the start of the file and write the maximum key length then write the crashed status byte. */
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my_seek(index_file, 0l, MY_SEEK_SET, MYF(0)); memcpy(&len, &max_key_len, sizeof(int)); i = my_write(index_file, &len, sizeof(int), MYF(0)); memcpy(&len, &crashed, sizeof(bool)); i = my_write(index_file, &len, sizeof(bool), MYF(0)); } DBUG_RETURN(0); } /* write a row (SDE_INDEX struct) to the index file */ long long Spartan_index::write_row(SDE_INDEX *ndx) { long long pos; int i; int len; DBUG_ENTER("Spartan_index::write_row"); /* Seek the end of the file (always append) */ pos = my_seek(index_file, 0l, MY_SEEK_END, MYF(0)); /* Write the key value. */ i = my_write(index_file, ndx->key, max_key_len, MYF(0)); memcpy(&pos, &ndx->pos, sizeof(long long)); /* Write the file position for the key value. */ i = i + my_write(index_file, (byte *)&pos, sizeof(long long), MYF(0)); memcpy(&len, &ndx->length, sizeof(int)); /* Write the length of the key. */ i = i + my_write(index_file, (byte *)&len, sizeof(int), MYF(0)); if (i == -1) pos = i; DBUG_RETURN(pos); } /* read a row (SDE_INDEX struct) from the index file */ SDE_INDEX *Spartan_index::read_row(long long Position) { int i; long long pos; SDE_INDEX *ndx = NULL; DBUG_ENTER("Spartan_index::read_row");
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/* Seek the position in the file (Position). */ pos = my_seek(index_file,(ulong) Position, MY_SEEK_SET, MYF(0)); if (pos != -1L) { ndx = new SDE_INDEX(); /* Read the key value. */ i = my_read(index_file, ndx->key, max_key_len, MYF(0)); /* Read the key value. If error, return NULL. */ i = my_read(index_file, (byte *)&ndx->pos, sizeof(long long), MYF(0)); if (i == -1) { delete ndx; ndx = NULL; } } DBUG_RETURN(ndx); } /* insert a key into the index in memory */ int Spartan_index::insert_key(SDE_INDEX *ndx, bool allow_dupes) { SDE_NDX_NODE *p = NULL; SDE_NDX_NODE *n = NULL; SDE_NDX_NODE *o = NULL; int i = -1; int icmp; bool dupe = false; bool done = false; DBUG_ENTER("Spartan_index::insert_key"); /* If this is a new index, insert first key as the root node. */ if (root == NULL) { root = new SDE_NDX_NODE(); root->next = NULL; root->prev = NULL; memcpy(root->key_ndx.key, ndx->key, max_key_len); root->key_ndx.pos = ndx->pos; root->key_ndx.length = ndx->length; }
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else //set pointer to root p = root; /* Loop through the linked list until a value greater than the key to be inserted, then insert new key before that one. */ while ((p != NULL) && !done) { icmp = memcmp(ndx->key, p->key_ndx.key, (ndx->length > p->key_ndx.length) ndx->length : p->key_ndx.length); if (icmp > 0) // key is greater than current key in list { n = p; p = p->next; } /* If dupes not allowed, stop and return NULL */ else if (!allow_dupes && (icmp == 0)) { p = NULL; dupe = true; } else { n = p->prev; //stop, insert at n->prev done = true; } } /* If position found (n != NULL) and dupes permitted, insert key. If p is NULL insert at end else insert in middle of list. */ if ((n != NULL) && !dupe) { if (p == NULL) //insert at end { p = new SDE_NDX_NODE(); n->next = p; p->prev = n; memcpy(p->key_ndx.key, ndx->key, max_key_len); p->key_ndx.pos = ndx->pos; p->key_ndx.length = ndx->length; }
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