projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 73f3d1b4 NT |
1 | /** |
| 2 | * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This source code is licensed under the BSD-style license found in the | |
| 6 | * LICENSE file in the root directory of https://github.com/facebook/zstd. | |
| 7 | * An additional grant of patent rights can be found in the PATENTS file in the | |
| 8 | * same directory. | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify it under | |
| 11 | * the terms of the GNU General Public License version 2 as published by the | |
| 12 | * Free Software Foundation. This program is dual-licensed; you may select | |
| 13 | * either version 2 of the GNU General Public License ("GPL") or BSD license | |
| 14 | * ("BSD"). | |
| 15 | */ | |
| 16 | ||
| 17 | /*-************************************* | |
| 18 | * Dependencies | |
| 19 | ***************************************/ | |
| 20 | #include "error_private.h" | |
| 21 | #include "zstd_internal.h" /* declaration of ZSTD_isError, ZSTD_getErrorName, ZSTD_getErrorCode, ZSTD_getErrorString, ZSTD_versionNumber */ | |
| 22 | #include <linux/kernel.h> | |
| 23 | ||
| 24 | /*=************************************************************** | |
| 25 | * Custom allocator | |
| 26 | ****************************************************************/ | |
| 27 | ||
| 28 | #define stack_push(stack, size) \ | |
| 29 | ({ \ | |
| 30 | void *const ptr = ZSTD_PTR_ALIGN((stack)->ptr); \ | |
| 31 | (stack)->ptr = (char *)ptr + (size); \ | |
| 32 | (stack)->ptr <= (stack)->end ? ptr : NULL; \ | |
| 33 | }) | |
| 34 | ||
| 35 | ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize) | |
| 36 | { | |
| 37 | ZSTD_customMem stackMem = {ZSTD_stackAlloc, ZSTD_stackFree, workspace}; | |
| 38 | ZSTD_stack *stack = (ZSTD_stack *)workspace; | |
| 39 | /* Verify preconditions */ | |
| 40 | if (!workspace || workspaceSize < sizeof(ZSTD_stack) || workspace != ZSTD_PTR_ALIGN(workspace)) { | |
| 41 | ZSTD_customMem error = {NULL, NULL, NULL}; | |
| 42 | return error; | |
| 43 | } | |
| 44 | /* Initialize the stack */ | |
| 45 | stack->ptr = workspace; | |
| 46 | stack->end = (char *)workspace + workspaceSize; | |
| 47 | stack_push(stack, sizeof(ZSTD_stack)); | |
| 48 | return stackMem; | |
| 49 | } | |
| 50 | ||
| 51 | void *ZSTD_stackAllocAll(void *opaque, size_t *size) | |
| 52 | { | |
| 53 | ZSTD_stack *stack = (ZSTD_stack *)opaque; | |
| 54 | *size = (BYTE const *)stack->end - (BYTE *)ZSTD_PTR_ALIGN(stack->ptr); | |
| 55 | return stack_push(stack, *size); | |
| 56 | } | |
| 57 | ||
| 58 | void *ZSTD_stackAlloc(void *opaque, size_t size) | |
| 59 | { | |
| 60 | ZSTD_stack *stack = (ZSTD_stack *)opaque; | |
| 61 | return stack_push(stack, size); | |
| 62 | } | |
| 63 | void ZSTD_stackFree(void *opaque, void *address) | |
| 64 | { | |
| 65 | (void)opaque; | |
| 66 | (void)address; | |
| 67 | } | |
| 68 | ||
| 69 | void *ZSTD_malloc(size_t size, ZSTD_customMem customMem) { return customMem.customAlloc(customMem.opaque, size); } | |
| 70 | ||
| 71 | void ZSTD_free(void *ptr, ZSTD_customMem customMem) | |
| 72 | { | |
| 73 | if (ptr != NULL) | |
| 74 | customMem.customFree(customMem.opaque, ptr); | |
| 75 | } |