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+/*****************************************************************************
+
+Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/dyn0dyn.ic
+The dynamically allocated array
+
+Created 2/5/1996 Heikki Tuuri
+*******************************************************/
+
+/** Value of dyn_block_struct::magic_n */
+#define DYN_BLOCK_MAGIC_N 375767
+/** Flag for dyn_block_struct::used that indicates a full block */
+#define DYN_BLOCK_FULL_FLAG 0x1000000UL
+
+/************************************************************//**
+Adds a new block to a dyn array.
+@return created block */
+UNIV_INTERN
+dyn_block_t*
+dyn_array_add_block(
+/*================*/
+ dyn_array_t* arr); /*!< in: dyn array */
+
+
+/************************************************************//**
+Gets the first block in a dyn array. */
+UNIV_INLINE
+dyn_block_t*
+dyn_array_get_first_block(
+/*======================*/
+ dyn_array_t* arr) /*!< in: dyn array */
+{
+ return(arr);
+}
+
+/************************************************************//**
+Gets the last block in a dyn array. */
+UNIV_INLINE
+dyn_block_t*
+dyn_array_get_last_block(
+/*=====================*/
+ dyn_array_t* arr) /*!< in: dyn array */
+{
+ if (arr->heap == NULL) {
+
+ return(arr);
+ }
+
+ return(UT_LIST_GET_LAST(arr->base));
+}
+
+/********************************************************************//**
+Gets the next block in a dyn array.
+@return pointer to next, NULL if end of list */
+UNIV_INLINE
+dyn_block_t*
+dyn_array_get_next_block(
+/*=====================*/
+ dyn_array_t* arr, /*!< in: dyn array */
+ dyn_block_t* block) /*!< in: dyn array block */
+{
+ ut_ad(arr && block);
+
+ if (arr->heap == NULL) {
+ ut_ad(arr == block);
+
+ return(NULL);
+ }
+
+ return(UT_LIST_GET_NEXT(list, block));
+}
+
+/********************************************************************//**
+Gets the number of used bytes in a dyn array block.
+@return number of bytes used */
+UNIV_INLINE
+ulint
+dyn_block_get_used(
+/*===============*/
+ dyn_block_t* block) /*!< in: dyn array block */
+{
+ ut_ad(block);
+
+ return((block->used) & ~DYN_BLOCK_FULL_FLAG);
+}
+
+/********************************************************************//**
+Gets pointer to the start of data in a dyn array block.
+@return pointer to data */
+UNIV_INLINE
+byte*
+dyn_block_get_data(
+/*===============*/
+ dyn_block_t* block) /*!< in: dyn array block */
+{
+ ut_ad(block);
+
+ return(block->data);
+}
+
+/*********************************************************************//**
+Initializes a dynamic array.
+@return initialized dyn array */
+UNIV_INLINE
+dyn_array_t*
+dyn_array_create(
+/*=============*/
+ dyn_array_t* arr) /*!< in: pointer to a memory buffer of
+ size sizeof(dyn_array_t) */
+{
+ ut_ad(arr);
+#if DYN_ARRAY_DATA_SIZE >= DYN_BLOCK_FULL_FLAG
+# error "DYN_ARRAY_DATA_SIZE >= DYN_BLOCK_FULL_FLAG"
+#endif
+
+ arr->heap = NULL;
+ arr->used = 0;
+
+#ifdef UNIV_DEBUG
+ arr->buf_end = 0;
+ arr->magic_n = DYN_BLOCK_MAGIC_N;
+#endif
+ return(arr);
+}
+
+/************************************************************//**
+Frees a dynamic array. */
+UNIV_INLINE
+void
+dyn_array_free(
+/*===========*/
+ dyn_array_t* arr) /*!< in: dyn array */
+{
+ if (arr->heap != NULL) {
+ mem_heap_free(arr->heap);
+ }
+
+#ifdef UNIV_DEBUG
+ arr->magic_n = 0;
+#endif
+}
+
+/*********************************************************************//**
+Makes room on top of a dyn array and returns a pointer to the added element.
+The caller must copy the element to the pointer returned.
+@return pointer to the element */
+UNIV_INLINE
+void*
+dyn_array_push(
+/*===========*/
+ dyn_array_t* arr, /*!< in: dynamic array */
+ ulint size) /*!< in: size in bytes of the element */
+{
+ dyn_block_t* block;
+ ulint used;
+
+ ut_ad(arr);
+ ut_ad(arr->magic_n == DYN_BLOCK_MAGIC_N);
+ ut_ad(size <= DYN_ARRAY_DATA_SIZE);
+ ut_ad(size);
+
+ block = arr;
+ used = block->used;
+
+ if (used + size > DYN_ARRAY_DATA_SIZE) {
+ /* Get the last array block */
+
+ block = dyn_array_get_last_block(arr);
+ used = block->used;
+
+ if (used + size > DYN_ARRAY_DATA_SIZE) {
+ block = dyn_array_add_block(arr);
+ used = block->used;
+ }
+ }
+
+ block->used = used + size;
+ ut_ad(block->used <= DYN_ARRAY_DATA_SIZE);
+
+ return((block->data) + used);
+}
+
+/*********************************************************************//**
+Makes room on top of a dyn array and returns a pointer to a buffer in it.
+After copying the elements, the caller must close the buffer using
+dyn_array_close.
+@return pointer to the buffer */
+UNIV_INLINE
+byte*
+dyn_array_open(
+/*===========*/
+ dyn_array_t* arr, /*!< in: dynamic array */
+ ulint size) /*!< in: size in bytes of the buffer; MUST be
+ smaller than DYN_ARRAY_DATA_SIZE! */
+{
+ dyn_block_t* block;
+ ulint used;
+
+ ut_ad(arr);
+ ut_ad(arr->magic_n == DYN_BLOCK_MAGIC_N);
+ ut_ad(size <= DYN_ARRAY_DATA_SIZE);
+ ut_ad(size);
+
+ block = arr;
+ used = block->used;
+
+ if (used + size > DYN_ARRAY_DATA_SIZE) {
+ /* Get the last array block */
+
+ block = dyn_array_get_last_block(arr);
+ used = block->used;
+
+ if (used + size > DYN_ARRAY_DATA_SIZE) {
+ block = dyn_array_add_block(arr);
+ used = block->used;
+ ut_a(size <= DYN_ARRAY_DATA_SIZE);
+ }
+ }
+
+ ut_ad(block->used <= DYN_ARRAY_DATA_SIZE);
+#ifdef UNIV_DEBUG
+ ut_ad(arr->buf_end == 0);
+
+ arr->buf_end = used + size;
+#endif
+ return((block->data) + used);
+}
+
+/*********************************************************************//**
+Closes the buffer returned by dyn_array_open. */
+UNIV_INLINE
+void
+dyn_array_close(
+/*============*/
+ dyn_array_t* arr, /*!< in: dynamic array */
+ byte* ptr) /*!< in: buffer space from ptr up was not used */
+{
+ dyn_block_t* block;
+
+ ut_ad(arr);
+ ut_ad(arr->magic_n == DYN_BLOCK_MAGIC_N);
+
+ block = dyn_array_get_last_block(arr);
+
+ ut_ad(arr->buf_end + block->data >= ptr);
+
+ block->used = ptr - block->data;
+
+ ut_ad(block->used <= DYN_ARRAY_DATA_SIZE);
+
+#ifdef UNIV_DEBUG
+ arr->buf_end = 0;
+#endif
+}
+
+/************************************************************//**
+Returns pointer to an element in dyn array.
+@return pointer to element */
+UNIV_INLINE
+void*
+dyn_array_get_element(
+/*==================*/
+ dyn_array_t* arr, /*!< in: dyn array */
+ ulint pos) /*!< in: position of element as bytes
+ from array start */
+{
+ dyn_block_t* block;
+ ulint used;
+
+ ut_ad(arr);
+ ut_ad(arr->magic_n == DYN_BLOCK_MAGIC_N);
+
+ /* Get the first array block */
+ block = dyn_array_get_first_block(arr);
+
+ if (arr->heap != NULL) {
+ used = dyn_block_get_used(block);
+
+ while (pos >= used) {
+ pos -= used;
+ block = UT_LIST_GET_NEXT(list, block);
+ ut_ad(block);
+
+ used = dyn_block_get_used(block);
+ }
+ }
+
+ ut_ad(block);
+ ut_ad(dyn_block_get_used(block) >= pos);
+
+ return(block->data + pos);
+}
+
+/************************************************************//**
+Returns the size of stored data in a dyn array.
+@return data size in bytes */
+UNIV_INLINE
+ulint
+dyn_array_get_data_size(
+/*====================*/
+ dyn_array_t* arr) /*!< in: dyn array */
+{
+ dyn_block_t* block;
+ ulint sum = 0;
+
+ ut_ad(arr);
+ ut_ad(arr->magic_n == DYN_BLOCK_MAGIC_N);
+
+ if (arr->heap == NULL) {
+
+ return(arr->used);
+ }
+
+ /* Get the first array block */
+ block = dyn_array_get_first_block(arr);
+
+ while (block != NULL) {
+ sum += dyn_block_get_used(block);
+ block = dyn_array_get_next_block(arr, block);
+ }
+
+ return(sum);
+}
+
+/********************************************************//**
+Pushes n bytes to a dyn array. */
+UNIV_INLINE
+void
+dyn_push_string(
+/*============*/
+ dyn_array_t* arr, /*!< in: dyn array */
+ const byte* str, /*!< in: string to write */
+ ulint len) /*!< in: string length */
+{
+ ulint n_copied;
+
+ while (len > 0) {
+ if (len > DYN_ARRAY_DATA_SIZE) {
+ n_copied = DYN_ARRAY_DATA_SIZE;
+ } else {
+ n_copied = len;
+ }
+
+ memcpy(dyn_array_push(arr, n_copied), str, n_copied);
+
+ str += n_copied;
+ len -= n_copied;
+ }
+}