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76 lines
2.1 KiB
76 lines
2.1 KiB
4 months ago
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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MEM_IMG_H
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#define MEM_IMG_H
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#include <stddef.h>
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#include <stdint.h>
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#include "sleuthkit/tsk/tsk_tools_i.h"
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typedef struct {
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TSK_IMG_INFO img_info;
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const uint8_t *data;
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size_t size;
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} IMG_MEM_INFO;
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static ssize_t mem_read(TSK_IMG_INFO *img_info, TSK_OFF_T offset, char *buf,
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size_t len) {
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IMG_MEM_INFO *mem_info = reinterpret_cast<IMG_MEM_INFO *>(img_info);
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// Bounds-checking exists in the real drivers.
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if (offset > mem_info->size) {
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return -1;
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}
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ssize_t read_len = len;
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if (offset + len > mem_info->size) {
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read_len = mem_info->size - offset;
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}
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if (memcpy(buf, mem_info->data + offset, read_len) == nullptr) {
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return -1;
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} else {
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return read_len;
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}
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}
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static void mem_close(TSK_IMG_INFO *img_info) {
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IMG_MEM_INFO *mem_info = reinterpret_cast<IMG_MEM_INFO *>(img_info);
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tsk_deinit_lock(&(img_info->cache_lock));
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free(mem_info);
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}
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static void mem_imgstat(TSK_IMG_INFO *img_info, FILE *hFile) {}
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TSK_IMG_INFO *mem_open(const uint8_t *data, size_t size) {
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IMG_MEM_INFO *inmemory_img =
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reinterpret_cast<IMG_MEM_INFO *>(malloc(sizeof(IMG_MEM_INFO)));
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TSK_IMG_INFO *img;
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if (inmemory_img == nullptr) {
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return nullptr;
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}
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img = reinterpret_cast<TSK_IMG_INFO *>(inmemory_img);
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img->itype = TSK_IMG_TYPE_RAW;
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img->read = mem_read;
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img->close = mem_close;
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img->imgstat = mem_imgstat;
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img->size = size;
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img->sector_size = 512;
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tsk_init_lock(&(img->cache_lock));
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inmemory_img->data = data;
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inmemory_img->size = size;
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return img;
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}
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#endif // # MEM_IMG_H
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