102 lines · cpp
1//===-- Implementation of fopencookie -------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/stdio/fopencookie.h"10#include "hdr/stdio_macros.h"11#include "hdr/types/FILE.h"12#include "hdr/types/cookie_io_functions_t.h"13#include "hdr/types/off_t.h"14#include "src/__support/CPP/new.h"15#include "src/__support/File/file.h"16 17#include "src/__support/libc_errno.h"18#include "src/__support/macros/config.h"19 20namespace LIBC_NAMESPACE_DECL {21 22namespace {23 24class CookieFile : public LIBC_NAMESPACE::File {25 void *cookie;26 cookie_io_functions_t ops;27 28 static FileIOResult cookie_write(File *f, const void *data, size_t size);29 static FileIOResult cookie_read(File *f, void *data, size_t size);30 static ErrorOr<off_t> cookie_seek(File *f, off_t offset, int whence);31 static int cookie_close(File *f);32 33public:34 CookieFile(void *c, cookie_io_functions_t cops, uint8_t *buffer,35 size_t bufsize, File::ModeFlags mode)36 : File(&cookie_write, &cookie_read, &CookieFile::cookie_seek,37 &cookie_close, buffer, bufsize, 0 /* default buffering mode */,38 true /* File owns buffer */, mode),39 cookie(c), ops(cops) {}40};41 42FileIOResult CookieFile::cookie_write(File *f, const void *data, size_t size) {43 auto cookie_file = reinterpret_cast<CookieFile *>(f);44 if (cookie_file->ops.write == nullptr)45 return 0;46 return static_cast<size_t>(cookie_file->ops.write(47 cookie_file->cookie, reinterpret_cast<const char *>(data), size));48}49 50FileIOResult CookieFile::cookie_read(File *f, void *data, size_t size) {51 auto cookie_file = reinterpret_cast<CookieFile *>(f);52 if (cookie_file->ops.read == nullptr)53 return 0;54 return static_cast<size_t>(cookie_file->ops.read(55 cookie_file->cookie, reinterpret_cast<char *>(data), size));56}57 58ErrorOr<off_t> CookieFile::cookie_seek(File *f, off_t offset, int whence) {59 auto cookie_file = reinterpret_cast<CookieFile *>(f);60 if (cookie_file->ops.seek == nullptr) {61 return Error(EINVAL);62 }63 off64_t offset64 = offset;64 int result = cookie_file->ops.seek(cookie_file->cookie, &offset64, whence);65 if (result == 0)66 return offset64;67 return -1;68}69 70int CookieFile::cookie_close(File *f) {71 auto cookie_file = reinterpret_cast<CookieFile *>(f);72 if (cookie_file->ops.close == nullptr)73 return 0;74 int retval = cookie_file->ops.close(cookie_file->cookie);75 if (retval != 0)76 return retval;77 delete cookie_file;78 return 0;79}80 81} // anonymous namespace82 83LLVM_LIBC_FUNCTION(::FILE *, fopencookie,84 (void *cookie, const char *mode,85 cookie_io_functions_t ops)) {86 uint8_t *buffer;87 {88 AllocChecker ac;89 buffer = new (ac) uint8_t[File::DEFAULT_BUFFER_SIZE];90 if (!ac)91 return nullptr;92 }93 AllocChecker ac;94 auto *file = new (ac) CookieFile(95 cookie, ops, buffer, File::DEFAULT_BUFFER_SIZE, File::mode_flags(mode));96 if (!ac)97 return nullptr;98 return reinterpret_cast<::FILE *>(file);99}100 101} // namespace LIBC_NAMESPACE_DECL102