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https://github.com/Fennix-Project/Kernel.git
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Restructured and rewritten entire codebase
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178
storage/fs/ustar.cpp
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178
storage/fs/ustar.cpp
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/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <filesystem/ustar.hpp>
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#include <memory.hpp>
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#include <debug.h>
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#include "../../kernel.h"
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namespace vfs
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{
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size_t USTARNode::read(uint8_t *Buffer,
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size_t Size,
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off_t Offset)
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{
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if (Size <= 0)
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Size = this->Size;
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if (Offset > this->Size)
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return 0;
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if ((this->Size - Offset) == 0)
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return 0; /* EOF */
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if (Offset + (off_t)Size > this->Size)
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Size = this->Size;
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memcpy(Buffer, (uint8_t *)(this->Address + Offset), Size);
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return Size;
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}
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USTARNode::USTARNode(uintptr_t Address,
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const char *Name,
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NodeType Type,
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Virtual *vfs_ctx)
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: Node(nullptr,
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Name,
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Type,
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true,
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vfs_ctx,
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nullptr),
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Address(Address)
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{
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}
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USTARNode::~USTARNode() {}
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bool USTAR::TestArchive(uintptr_t Address)
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{
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if (!Memory::Virtual().Check((void *)Address))
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{
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error("Address %#lx is not mapped!", Address);
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return false;
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}
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FileHeader *header = (FileHeader *)Address;
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if (memcmp(header->signature, "ustar", 5) != 0)
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{
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error("ustar signature invalid!");
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return false;
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}
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return true;
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}
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void USTAR::ReadArchive(uintptr_t Address, Virtual *vfs_ctx)
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{
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trace("Initializing USTAR with address %#lx", Address);
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if (!this->TestArchive(Address))
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return; /* Check whether the archive is deflated */
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FileHeader *header = (FileHeader *)Address;
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debug("USTAR signature valid! Name:%s Signature:%s Mode:%d Size:%lu",
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header->name, header->signature,
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string2int(header->mode), header->size);
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for (size_t i = 0;; i++)
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{
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if (memcmp(header->signature, "ustar", 5) != 0)
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break;
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memmove(header->name,
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header->name + 1,
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strlen(header->name));
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if (header->name[strlen(header->name) - 1] == '/')
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{
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debug("Removing trailing slash from %s", header->name);
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header->name[strlen(header->name) - 1] = 0;
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}
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// if (!isempty((char *)header->name))
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// KPrint("Adding file \e88AACC%s\eCCCCCC (\e88AACC%lu \eCCCCCCbytes)", header->name, size);
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// else
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// goto NextFileAddress;
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size_t size = getsize(header->size);
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Node *node;
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NodeType type = NODE_TYPE_NONE;
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if (isempty((char *)header->name))
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goto NextFileAddress;
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switch (header->typeflag[0])
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{
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case REGULAR_FILE:
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type = NodeType::FILE;
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break;
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case SYMLINK:
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type = NodeType::SYMLINK;
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break;
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case DIRECTORY:
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type = NodeType::DIRECTORY;
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break;
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case CHARDEV:
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type = NodeType::CHARDEVICE;
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break;
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case BLOCKDEV:
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type = NodeType::BLOCKDEVICE;
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break;
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default:
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warn("Unknown type: %d", header->typeflag[0]);
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break;
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}
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node = new USTARNode((Address + 512), header->name,
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type, vfs_ctx);
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debug("%s %d KiB, Type:%c", header->name,
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TO_KiB(size), header->typeflag[0]);
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node->Mode = string2int(header->mode);
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node->Size = size;
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node->GroupIdentifier = getsize(header->gid);
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node->UserIdentifier = getsize(header->uid);
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node->DeviceMajor = getsize(header->dev_maj);
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node->DeviceMinor = getsize(header->dev_min);
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node->AccessTime = getsize(header->mtime);
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node->ModifyTime = getsize(header->mtime);
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node->ChangeTime = getsize(header->mtime);
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node->IndexNode = i;
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if (type == NodeType::SYMLINK)
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{
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node->Symlink = new char[strlen(header->link) + 1];
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strncpy((char *)node->Symlink,
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header->link,
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strlen(header->link));
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}
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NextFileAddress:
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Address += ((size / 512) + 1) * 512;
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if (size % 512)
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Address += 512;
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header = (FileHeader *)Address;
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}
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}
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USTAR::USTAR() {}
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USTAR::~USTAR() {}
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}
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