mirror of https://github.com/axmolengine/axmol.git
400 lines
12 KiB
C++
400 lines
12 KiB
C++
// Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md)
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#include "platform/FileStream.h"
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#if AX_TARGET_PLATFORM == AX_PLATFORM_ANDROID
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# include "platform/android/FileUtils-android.h"
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# include "base/ZipUtils.h"
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#endif
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#include <sys/stat.h>
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#include <assert.h>
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#if defined(_WIN32)
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# include "ntcvt/ntcvt.hpp"
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#else
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# include <unistd.h>
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# include <errno.h>
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# include <fcntl.h>
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# define O_SHARE_FLAGS (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)
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# define O_READ_FLAGS O_RDONLY, 0
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# define O_WRITE_FLAGS O_CREAT | O_RDWR | O_TRUNC, O_SHARE_FLAGS
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# define O_APPEND_FLAGS O_APPEND | O_CREAT | O_RDWR, O_SHARE_FLAGS
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# define O_OVERLAP_FLAGS O_CREAT | O_RDWR, O_SHARE_FLAGS
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# define posix_open_cxx(path, ...) ::open(path.data(), ##__VA_ARGS__)
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# define posix_open ::open
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# define posix_close ::close
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# define posix_lseek ::lseek
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# define posix_read ::read
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# define posix_write ::write
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# define posix_fd2fh(fd) (fd)
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# define posix_ftruncate ::ftruncate
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# if defined(__APPLE__) || defined(__EMSCRIPTEN__)
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# define posix_lseek64 ::lseek
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# define posix_ftruncate64 ::ftruncate
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# else
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# define posix_lseek64 ::lseek64
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# define posix_ftruncate64 ::ftruncate64
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# endif
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#endif
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NS_AX_BEGIN
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struct PXIoF
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{
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int (*read)(const PXFileHandle& fh, void*, unsigned int);
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int (*write)(const PXFileHandle& fh, const void*, unsigned int);
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int64_t (*seek)(const PXFileHandle& fh, int64_t, int);
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int (*close)(PXFileHandle& fh);
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int64_t (*size)(const PXFileHandle& fh);
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int (*resize)(const PXFileHandle& fh, int64_t);
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};
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static int64_t axrt_lowio_seek(const PXFileHandle& fh, int64_t offst, int origin);
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struct __axrt_seek_guard
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{
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__axrt_seek_guard(const PXFileHandle& fh)
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: place(axrt_lowio_seek(fh, 0, SEEK_CUR)), end(axrt_lowio_seek(fh, 0, SEEK_END)), fhh(fh)
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{}
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~__axrt_seek_guard() { axrt_lowio_seek(fhh, place, SEEK_SET); }
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__axrt_seek_guard(__axrt_seek_guard const&) = delete;
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__axrt_seek_guard& operator=(__axrt_seek_guard const&) = delete;
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const PXFileHandle& fhh;
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int64_t place;
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int64_t end;
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};
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static inline int __axrt_errno_or(int ec)
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{
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auto value = errno;
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if (!value)
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errno = value = ec;
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return value;
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}
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#if defined(_WIN32)
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# define __axrt_truncate_file(fh, size) ::SetEndOfFile(fh)
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# if !defined(WINAPI_FAMILY) || WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP
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# define __axrt_create_file(path, omode, smode, cflags, fflags, fattrs) \
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CreateFileW(path, omode, smode, nullptr, cflags, fflags | fattrs, nullptr)
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# else
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static HANDLE __axrt_create_file(LPCWSTR path, DWORD omode, DWORD smode, DWORD cflags, DWORD fflags, DWORD fattrs)
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{
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if (!(fflags | fattrs))
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return CreateFile2(path, omode, smode, cflags, nullptr);
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else
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{
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CREATEFILE2_EXTENDED_PARAMETERS params = {0};
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params.dwSize = sizeof(params);
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params.dwFileFlags = fflags;
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params.dwFileAttributes = fattrs;
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return CreateFile2(path, omode, smode, cflags, ¶ms);
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}
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}
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# endif
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# define _LOWIO_SH_DENYNO (FILE_SHARE_READ | FILE_SHARE_WRITE)
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static bool axrt_lowio_open(std::string_view path, IFileStream::Mode mode, PXFileHandle& fh)
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{
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static constexpr DWORD __axrt_open_mode2options[][5] = {
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// readonly
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{GENERIC_READ, _LOWIO_SH_DENYNO, OPEN_EXISTING, 0, 0},
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// write
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{GENERIC_READ | GENERIC_WRITE, _LOWIO_SH_DENYNO, CREATE_ALWAYS, 0, FILE_ATTRIBUTE_NORMAL},
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// append
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{GENERIC_READ | GENERIC_WRITE, _LOWIO_SH_DENYNO, OPEN_ALWAYS, 0, FILE_ATTRIBUTE_NORMAL},
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// overlap
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{GENERIC_READ | GENERIC_WRITE, _LOWIO_SH_DENYNO, OPEN_ALWAYS, 0, FILE_ATTRIBUTE_NORMAL},
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};
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auto wFileName = ntcvt::from_chars(path);
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const auto opts = __axrt_open_mode2options[(int)mode & 0b11];
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fh.osfh = __axrt_create_file(wFileName.c_str(), opts[0], opts[1], opts[2], opts[3], opts[4]);
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if (fh.osfh != INVALID_HANDLE_VALUE)
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{
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fh.append = mode == IFileStream::Mode::APPEND;
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return true;
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}
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return false;
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}
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static int axrt_lowio_read(const PXFileHandle& fh, void* buf, unsigned int size)
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{
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DWORD dwBytesRead = 0;
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if (::ReadFile(fh.osfh, buf, size, &dwBytesRead, nullptr))
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return static_cast<int>(dwBytesRead);
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errno = EACCES;
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return -1;
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}
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static int axrt_lowio_write(const PXFileHandle& fh, const void* buf, unsigned int size)
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{
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if (fh.append)
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::SetFilePointer(fh.osfh, 0, 0, FILE_END);
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DWORD dwBytesWrite = 0;
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if (::WriteFile(fh.osfh, buf, size, &dwBytesWrite, nullptr))
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return static_cast<int>(dwBytesWrite);
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errno = EACCES;
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return -1;
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}
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static int64_t axrt_lowio_seek(const PXFileHandle& fh, int64_t offset, int origin)
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{
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LARGE_INTEGER seekpos, newpos;
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seekpos.QuadPart = offset;
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if (SetFilePointerEx(fh.osfh, seekpos, &newpos, origin))
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return newpos.QuadPart;
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errno = EINVAL;
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return -1;
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}
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static int64_t axrt_lowio_size(const PXFileHandle& fh)
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{
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LARGE_INTEGER endpos;
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return ::GetFileSizeEx(fh.osfh, &endpos) ? endpos.QuadPart : 0;
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}
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static int axrt_lowio_close(PXFileHandle& fh)
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{
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if (fh.osfh != INVALID_HANDLE_VALUE)
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{
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CloseHandle(fh.osfh);
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fh.osfh = INVALID_HANDLE_VALUE;
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}
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return 0;
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}
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#else
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# define __axrt_truncate_file(fh, size) (posix_ftruncate64(fh, size) == 0)
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static bool axrt_lowio_open(std::string_view path, IFileStream::Mode mode, PXFileHandle& fh)
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{
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static constexpr int __axrt_open_mode2options[][3] = {
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{O_READ_FLAGS},
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{O_WRITE_FLAGS},
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{O_APPEND_FLAGS},
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{O_OVERLAP_FLAGS},
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};
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const auto opts = __axrt_open_mode2options[(int)mode & 0b11];
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fh.osfh = posix_open_cxx(path, opts[0], opts[1]);
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return fh.osfh != -1;
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}
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static int axrt_lowio_read(const PXFileHandle& fh, void* buf, unsigned int size)
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{
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return static_cast<int>(posix_read(fh.osfh, buf, size));
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}
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static int axrt_lowio_write(const PXFileHandle& fh, const void* buf, unsigned int size)
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{
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return static_cast<int>(posix_write(fh.osfh, buf, size));
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}
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static int64_t axrt_lowio_seek(const PXFileHandle& fh, int64_t offset, int origin)
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{
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return posix_lseek64(fh.osfh, offset, origin);
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}
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static int64_t axrt_lowio_size(const PXFileHandle& fh)
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{
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// Get current file position and seek to end
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__axrt_seek_guard seek_guard(fh);
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return seek_guard.end != -1 ? seek_guard.end : 0;
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}
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static int axrt_lowio_close(PXFileHandle& fh)
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{
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int fd = fh.osfh;
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if (fd != -1)
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{
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fh.osfh = -1;
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return posix_close(fd);
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}
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return 0;
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}
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#endif
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static int axrt_lowio_resize(const PXFileHandle& fh, int64_t size)
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{
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// Get current file position and seek to end
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__axrt_seek_guard seek_guard(fh);
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if (seek_guard.place == -1 || seek_guard.end == -1)
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{
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// EINVAL otherwise (ex: too large of a offset)
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return __axrt_errno_or(EINVAL);
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}
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// move pointer to new sizes
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int64_t const new_end = axrt_lowio_seek(fh, size, SEEK_SET);
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if (new_end == -1)
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return errno;
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if (!__axrt_truncate_file(fh.osfh, size))
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return __axrt_errno_or(EACCES);
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// Shorten the file by truncating it, ensure restore place don't grater than new file size
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int64_t const extend = size - seek_guard.end;
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if (extend < 0 && seek_guard.place > new_end)
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seek_guard.place = new_end;
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return 0;
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}
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static const PXIoF axrt_lowio_iof = {axrt_lowio_read, axrt_lowio_write, axrt_lowio_seek,
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axrt_lowio_close, axrt_lowio_size, axrt_lowio_resize};
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#if AX_TARGET_PLATFORM == AX_PLATFORM_ANDROID
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static int axrt_dummy_write(const PXFileHandle& /*fh*/, const void* /*buf*/, unsigned int /*size*/)
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{
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return -1;
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}
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static int axrt_dummy_resize(const PXFileHandle& /*fh*/, int64_t /*newsize*/)
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{
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return -1;
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}
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// android AssetManager wrappers
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static int axrt_asset_read(const PXFileHandle& fh, void* buf, unsigned int size)
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{
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return AAsset_read(fh.aasset, buf, size);
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}
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static int64_t axrt_asset_seek(const PXFileHandle& fh, int64_t offset, int origin)
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{
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return AAsset_seek(fh.aasset, offset, origin);
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}
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static int64_t axrt_asset_size(const PXFileHandle& fh)
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{
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return AAsset_getLength64(fh.aasset);
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}
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static int axrt_asset_close(PXFileHandle& fh)
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{
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if (fh.aasset != nullptr)
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{
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AAsset_close(fh.aasset);
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fh.aasset = nullptr;
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}
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return 0;
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}
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static const PXIoF axrt_asset_iof = {axrt_asset_read, axrt_dummy_write, axrt_asset_seek,
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axrt_asset_close, axrt_asset_size, axrt_dummy_resize};
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// android obb
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static int axrt_obb_read(const PXFileHandle& fh, void* buf, unsigned int size)
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{
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return FileUtilsAndroid::getObbFile()->vread(fh.zentry, buf, size);
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}
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static int64_t axrt_obb_seek(const PXFileHandle& fh, int64_t offset, int origin)
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{
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return FileUtilsAndroid::getObbFile()->vseek(fh.zentry, offset, origin);
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}
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static int64_t axrt_obb_size(const PXFileHandle& fh)
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{
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return FileUtilsAndroid::getObbFile()->vsize(fh.zentry);
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}
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static int axrt_obb_close(PXFileHandle& fh)
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{
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FileUtilsAndroid::getObbFile()->vclose(fh.zentry);
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return 0;
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}
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static const PXIoF axrt_obb_iof = {axrt_obb_read, axrt_dummy_write, axrt_obb_seek,
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axrt_obb_close, axrt_obb_size, axrt_dummy_resize};
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#endif
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FileStream::~FileStream()
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{
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internalClose();
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}
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bool FileStream::open(std::string_view path, IFileStream::Mode mode)
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{
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#if AX_TARGET_PLATFORM != AX_PLATFORM_ANDROID
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if (axrt_lowio_open(path, mode, _handle))
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this->_iof = &axrt_lowio_iof;
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#else // Android
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if (path[0] != '/')
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{ // from package, always readonly
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size_t position = path.find("assets/");
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// "assets/" is at the beginning of the path and we don't want it
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const auto relativePath = 0 == position ? path.substr(sizeof("assets/") - 1) : path;
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auto obb = FileUtilsAndroid::getObbFile();
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if (obb && (_handle.zentry = obb->vopen(relativePath)))
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{
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this->_iof = &axrt_obb_iof;
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}
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else
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{
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AAssetManager* asMgr = FileUtilsAndroid::getAssetManager();
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_handle.aasset = AAssetManager_open(asMgr, relativePath.data(), AASSET_MODE_UNKNOWN);
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if (_handle.aasset)
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this->_iof = &axrt_asset_iof;
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}
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}
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else
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{ // otherwise, as a absolutely path
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if (axrt_lowio_open(path, mode, _handle))
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this->_iof = &axrt_lowio_iof;
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}
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#endif
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return !!this->_iof;
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}
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osfhnd_t FileStream::nativeHandle() const
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{
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return _iof == &axrt_lowio_iof ? _handle.osfh : (osfhnd_t)-1;
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}
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int FileStream::internalClose()
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{
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if (_iof)
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{
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int ret = _iof->close(_handle);
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_iof = nullptr;
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return ret;
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}
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return 0;
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}
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int FileStream::close()
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{
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return internalClose();
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}
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int64_t FileStream::seek(int64_t offset, int origin) const
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{
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assert(_iof);
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return _iof->seek(_handle, offset, origin);
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}
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int FileStream::read(void* buf, unsigned int size) const
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{
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assert(_iof);
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return _iof->read(_handle, buf, size);
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}
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int FileStream::write(const void* buf, unsigned int size) const
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{
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assert(_iof);
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return _iof->write(_handle, buf, size);
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}
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int64_t FileStream::size() const
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{
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assert(_iof);
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return _iof->size(_handle);
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}
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int64_t FileStream::tell() const
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{
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assert(_iof);
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return _iof->seek(_handle, 0, SEEK_CUR);
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}
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bool FileStream::resize(int64_t size) const
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{
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assert(_iof);
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return _iof->resize(_handle, size) == 0;
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}
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bool FileStream::isOpen() const
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{
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return !!_iof;
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}
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NS_AX_END
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