From c81e80bf35874696d9735f70e5c8327f92b5aca4 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Fri, 16 Jun 2023 01:41:06 +0200 Subject: libsquashfs: merge windows & unix file I/O primitives By adding additional close/duplicate primitives, the remaining, mostly identical istream/ostream/file code is mostly identical between Windows and Unix and be merged, mostly without stitches. Signed-off-by: David Oberhollenzer --- lib/sqfs/src/io/file.c | 286 ++++++++++++++++++++++++++++++++++++++++++++++ lib/sqfs/src/io/istream.c | 203 ++++++++++++++++++++++++++++++++ lib/sqfs/src/io/ostream.c | 221 +++++++++++++++++++++++++++++++++++ lib/sqfs/src/io/unix.c | 87 ++++++++++++++ lib/sqfs/src/io/win32.c | 120 +++++++++++++++++++ 5 files changed, 917 insertions(+) create mode 100644 lib/sqfs/src/io/file.c create mode 100644 lib/sqfs/src/io/istream.c create mode 100644 lib/sqfs/src/io/ostream.c create mode 100644 lib/sqfs/src/io/unix.c create mode 100644 lib/sqfs/src/io/win32.c (limited to 'lib/sqfs/src/io') diff --git a/lib/sqfs/src/io/file.c b/lib/sqfs/src/io/file.c new file mode 100644 index 0000000..881730d --- /dev/null +++ b/lib/sqfs/src/io/file.c @@ -0,0 +1,286 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * file.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/io.h" +#include "sqfs/error.h" +#include "compat.h" + +#include +#include + +#if defined(_WIN32) || defined(__WINDOWS__) +static int get_file_size(HANDLE fd, sqfs_u64 *out) +{ + LARGE_INTEGER size; + if (!GetFileSizeEx(fd, &size)) + return -1; + *out = size.QuadPart; + return 0; +} +#else +#include +#include +#include + +static int get_file_size(int fd, sqfs_u64 *out) +{ + struct stat sb; + if (fstat(fd, &sb)) + return -1; + *out = sb.st_size; + return 0; +} +#endif + +typedef struct { + sqfs_file_t base; + + bool readonly; + sqfs_u64 size; + sqfs_file_handle_t fd; + + char name[]; +} sqfs_file_stdio_t; + + +static void stdio_destroy(sqfs_object_t *base) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + + sqfs_close_native_file(file->fd); + free(file); +} + +static sqfs_object_t *stdio_copy(const sqfs_object_t *base) +{ + const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base; + sqfs_file_stdio_t *copy; + size_t size; + + if (!file->readonly) { +#if defined(_WIN32) || defined(__WINDOWS__) + SetLastError(ERROR_NOT_SUPPORTED); +#else + errno = ENOTSUP; +#endif + return NULL; + } + + size = sizeof(*file) + strlen(file->name) + 1; + copy = calloc(1, size); + if (copy == NULL) + return NULL; + + memcpy(copy, file, size); + + if (sqfs_duplicate_native_file(file->fd, ©->fd)) { + os_error_t error = get_os_error_state(); + free(copy); + copy = NULL; + set_os_error_state(error); + } + + return (sqfs_object_t *)copy; +} + +#if defined(_WIN32) || defined(__WINDOWS__) +static int stdio_read_at(sqfs_file_t *base, sqfs_u64 offset, + void *buffer, size_t size) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + DWORD actually_read; + int ret; + + if (offset >= file->size) + return SQFS_ERROR_OUT_OF_BOUNDS; + + if (size == 0) + return 0; + + if ((offset + size - 1) >= file->size) + return SQFS_ERROR_OUT_OF_BOUNDS; + + ret = sqfs_seek_native_file(file->fd, offset, SQFS_FILE_SEEK_START); + if (ret) + return ret; + + while (size > 0) { + if (!ReadFile(file->fd, buffer, size, &actually_read, NULL)) + return SQFS_ERROR_IO; + + size -= actually_read; + buffer = (char *)buffer + actually_read; + } + + return 0; +} + +static int stdio_write_at(sqfs_file_t *base, sqfs_u64 offset, + const void *buffer, size_t size) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + DWORD actually_read; + int ret; + + if (size == 0) + return 0; + + ret = sqfs_seek_native_file(file->fd, offset, SQFS_FILE_SEEK_START); + if (ret) + return ret; + + while (size > 0) { + if (!WriteFile(file->fd, buffer, size, &actually_read, NULL)) + return SQFS_ERROR_IO; + + size -= actually_read; + buffer = (char *)buffer + actually_read; + offset += actually_read; + + if (offset > file->size) + file->size = offset; + } + + return 0; +} +#else +static int stdio_read_at(sqfs_file_t *base, sqfs_u64 offset, + void *buffer, size_t size) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + ssize_t ret; + + while (size > 0) { + ret = pread(file->fd, buffer, size, offset); + + if (ret < 0) { + if (errno == EINTR) + continue; + return SQFS_ERROR_IO; + } + + if (ret == 0) + return SQFS_ERROR_OUT_OF_BOUNDS; + + buffer = (char *)buffer + ret; + size -= ret; + offset += ret; + } + + return 0; +} + +static int stdio_write_at(sqfs_file_t *base, sqfs_u64 offset, + const void *buffer, size_t size) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + ssize_t ret; + + while (size > 0) { + ret = pwrite(file->fd, buffer, size, offset); + + if (ret < 0) { + if (errno == EINTR) + continue; + return SQFS_ERROR_IO; + } + + if (ret == 0) + return SQFS_ERROR_OUT_OF_BOUNDS; + + buffer = (const char *)buffer + ret; + size -= ret; + offset += ret; + } + + if (offset >= file->size) + file->size = offset; + + return 0; +} +#endif + +static sqfs_u64 stdio_get_size(const sqfs_file_t *base) +{ + const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base; + + return file->size; +} + +static int stdio_truncate(sqfs_file_t *base, sqfs_u64 size) +{ + sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base; + int ret; + + ret = sqfs_seek_native_file(file->fd, size, SQFS_FILE_SEEK_START | + SQFS_FILE_SEEK_TRUNCATE); + if (ret) + return ret; + + file->size = size; + return 0; +} + +static const char *stdio_get_filename(sqfs_file_t *file) +{ + return ((sqfs_file_stdio_t *)file)->name; +} + +sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags) +{ + bool file_opened = false; + sqfs_file_stdio_t *file; + size_t size, namelen; + sqfs_file_t *base; + os_error_t err; + + namelen = strlen(filename); + size = sizeof(*file) + 1; + + if (SZ_ADD_OV(size, namelen, &size)) + goto fail_no_mem; + + file = calloc(1, size); + base = (sqfs_file_t *)file; + if (file == NULL) + goto fail_no_mem; + + sqfs_object_init(file, stdio_destroy, stdio_copy); + memcpy(file->name, filename, namelen); + + if (sqfs_open_native_file(&file->fd, filename, flags)) + goto fail; + + file_opened = true; + if (get_file_size(file->fd, &file->size)) + goto fail; + + file->readonly = (flags & SQFS_FILE_OPEN_READ_ONLY) != 0; + + base->read_at = stdio_read_at; + base->write_at = stdio_write_at; + base->get_size = stdio_get_size; + base->truncate = stdio_truncate; + base->get_filename = stdio_get_filename; + return base; +fail: + err = get_os_error_state(); + if (file_opened) + sqfs_close_native_file(file->fd); + free(file); + set_os_error_state(err); + return NULL; +fail_no_mem: +#if defined(_WIN32) || defined(__WINDOWS__) + SetLastError(ERROR_NOT_ENOUGH_MEMORY); +#else + errno = ENOMEM; +#endif + return NULL; +} diff --git a/lib/sqfs/src/io/istream.c b/lib/sqfs/src/io/istream.c new file mode 100644 index 0000000..c3399fe --- /dev/null +++ b/lib/sqfs/src/io/istream.c @@ -0,0 +1,203 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * istream.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/io.h" +#include "sqfs/error.h" +#include "compat.h" + +#include +#include +#include +#include + +#if defined(_WIN32) || defined(__WINDOWS__) +static SSIZE_T read(HANDLE fd, void *ptr, size_t size) +{ + DWORD ret; + + if (!ReadFile(fd, ptr, size, &ret, NULL)) { + os_error_t error = get_os_error_state(); + set_os_error_state(error); + + if (error.w32_errno == ERROR_HANDLE_EOF || + error.w32_errno == ERROR_BROKEN_PIPE) { + return 0; + } + + return -1; + } + + return ret; +} +#endif + +#define BUFSZ (131072) + +typedef struct { + sqfs_istream_t base; + char *path; + sqfs_file_handle_t fd; + + bool eof; + size_t buffer_offset; + size_t buffer_used; + sqfs_u8 buffer[BUFSZ]; +} file_istream_t; + +static int precache(sqfs_istream_t *strm) +{ + file_istream_t *file = (file_istream_t *)strm; + + if (file->eof) + return 0; + + if (file->buffer_offset > 0 && + file->buffer_offset < file->buffer_used) { + memmove(file->buffer, file->buffer + file->buffer_offset, + file->buffer_used - file->buffer_offset); + } + + file->buffer_used -= file->buffer_offset; + file->buffer_offset = 0; + + while (file->buffer_used < BUFSZ) { + ssize_t ret = read(file->fd, file->buffer + file->buffer_used, + BUFSZ - file->buffer_used); + + if (ret == 0) { + file->eof = true; + break; + } + + if (ret < 0) { +#if !defined(_WIN32) && !defined(__WINDOWS__) + if (errno == EINTR) + continue; +#endif + return SQFS_ERROR_IO; + } + + file->buffer_used += ret; + } + + return 0; +} + +static int file_get_buffered_data(sqfs_istream_t *strm, const sqfs_u8 **out, + size_t *size, size_t want) +{ + file_istream_t *file = (file_istream_t *)strm; + + if (want > BUFSZ) + want = BUFSZ; + + if (file->buffer_used == 0 || + (file->buffer_used - file->buffer_offset) < want) { + int ret = precache(strm); + if (ret) + return ret; + } + + *out = file->buffer + file->buffer_offset; + *size = file->buffer_used - file->buffer_offset; + return (file->eof && *size == 0) ? 1 : 0; +} + +static void file_advance_buffer(sqfs_istream_t *strm, size_t count) +{ + file_istream_t *file = (file_istream_t *)strm; + + assert(count <= file->buffer_used); + + file->buffer_offset += count; + + assert(file->buffer_offset <= file->buffer_used); +} + +static const char *file_get_filename(sqfs_istream_t *strm) +{ + return ((file_istream_t *)strm)->path; +} + +static void file_destroy(sqfs_object_t *obj) +{ + file_istream_t *file = (file_istream_t *)obj; + + sqfs_close_native_file(file->fd); + free(file->path); + free(file); +} + +int sqfs_istream_open_handle(sqfs_istream_t **out, const char *path, + sqfs_file_handle_t fd, sqfs_u32 flags) +{ + file_istream_t *file; + sqfs_istream_t *strm; + int ret; + + if (flags & ~(SQFS_FILE_OPEN_ALL_FLAGS)) + return SQFS_ERROR_UNSUPPORTED; + + file = calloc(1, sizeof(*file)); + strm = (sqfs_istream_t *)file; + if (file == NULL) + return SQFS_ERROR_ALLOC; + + sqfs_object_init(file, file_destroy, NULL); + + file->path = strdup(path); + if (file->path == NULL) { + os_error_t err = get_os_error_state(); + free(file); + set_os_error_state(err); + return SQFS_ERROR_ALLOC; + } + + ret = sqfs_duplicate_native_file(fd, &file->fd); + if (ret) { + os_error_t err = get_os_error_state(); + free(file->path); + free(file); + set_os_error_state(err); + return ret; + } + sqfs_close_native_file(fd); + + strm->get_buffered_data = file_get_buffered_data; + strm->advance_buffer = file_advance_buffer; + strm->get_filename = file_get_filename; + + *out = strm; + return 0; +} + +int sqfs_istream_open_file(sqfs_istream_t **out, const char *path, + sqfs_u32 flags) +{ + sqfs_file_handle_t fd; + int ret; + + flags |= SQFS_FILE_OPEN_READ_ONLY; + + if (flags & (SQFS_FILE_OPEN_OVERWRITE | SQFS_FILE_OPEN_NO_SPARSE)) + return SQFS_ERROR_ARG_INVALID; + + ret = sqfs_open_native_file(&fd, path, flags); + if (ret) + return ret; + + ret = sqfs_istream_open_handle(out, path, fd, flags); + if (ret != 0) { + os_error_t err = get_os_error_state(); + sqfs_close_native_file(fd); + set_os_error_state(err); + } + + return ret; +} diff --git a/lib/sqfs/src/io/ostream.c b/lib/sqfs/src/io/ostream.c new file mode 100644 index 0000000..ba8e29a --- /dev/null +++ b/lib/sqfs/src/io/ostream.c @@ -0,0 +1,221 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * ostream.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/io.h" +#include "sqfs/error.h" +#include "compat.h" + +#include +#include +#include + +typedef struct { + sqfs_ostream_t base; + char *path; + sqfs_u32 flags; + sqfs_file_handle_t fd; + + sqfs_u64 sparse_count; + sqfs_u64 size; +} file_ostream_t; + +static int write_all(file_ostream_t *file, const sqfs_u8 *data, size_t size) +{ + while (size > 0) { +#if defined(_WIN32) || defined(__WINDOWS__) + DWORD ret; + if (!WriteFile(file->fd, data, size, &ret, NULL)) + return SQFS_ERROR_IO; +#else + ssize_t ret = write(file->fd, data, size); + + if (ret == 0) { + errno = EPIPE; + return SQFS_ERROR_IO; + } + + if (ret < 0) { + if (errno == EINTR) + continue; + return SQFS_ERROR_IO; + } +#endif + file->size += ret; + size -= ret; + data += ret; + } + + return 0; +} + +static int realize_sparse(file_ostream_t *file) +{ + unsigned char *buffer; + size_t diff, bufsz; + int ret; + + if (file->sparse_count == 0) + return 0; + + if (file->flags & SQFS_FILE_OPEN_NO_SPARSE) { + bufsz = file->sparse_count > 1024 ? 1024 : file->sparse_count; + buffer = calloc(1, bufsz); + if (buffer == NULL) + return SQFS_ERROR_ALLOC; + + while (file->sparse_count > 0) { + diff = file->sparse_count > bufsz ? + bufsz : file->sparse_count; + + ret = write_all(file, buffer, diff); + if (ret) { + os_error_t err = get_os_error_state(); + free(buffer); + set_os_error_state(err); + return ret; + } + + file->sparse_count -= diff; + } + + free(buffer); + } else { + ret = sqfs_seek_native_file(file->fd, file->sparse_count, + SQFS_FILE_SEEK_CURRENT | + SQFS_FILE_SEEK_TRUNCATE); + if (ret) + return ret; + + file->sparse_count = 0; + } + + return 0; +} + +static int file_append(sqfs_ostream_t *strm, const void *data, size_t size) +{ + file_ostream_t *file = (file_ostream_t *)strm; + int ret; + + if (size == 0 || data == NULL) { + file->sparse_count += size; + file->size += size; + return 0; + } + + ret = realize_sparse(file); + if (ret) + return ret; + + return write_all(file, data, size); +} + +static int file_flush(sqfs_ostream_t *strm) +{ + file_ostream_t *file = (file_ostream_t *)strm; + int ret; + + ret = realize_sparse(file); + if (ret) + return ret; + +#if defined(_WIN32) || defined(__WINDOWS__) + if (!FlushFileBuffers(file->fd)) + return SQFS_ERROR_IO; +#else + if (fsync(file->fd) != 0 && errno != EINVAL) + return SQFS_ERROR_IO; +#endif + return 0; +} + +static void file_destroy(sqfs_object_t *obj) +{ + file_ostream_t *file = (file_ostream_t *)obj; + + sqfs_close_native_file(file->fd); + free(file->path); + free(file); +} + +static const char *file_get_filename(sqfs_ostream_t *strm) +{ + return ((file_ostream_t *)strm)->path; +} + +int sqfs_ostream_open_handle(sqfs_ostream_t **out, const char *path, + sqfs_file_handle_t fd, sqfs_u32 flags) +{ + file_ostream_t *file; + sqfs_ostream_t *strm; + int ret; + + *out = NULL; + if (flags & ~(SQFS_FILE_OPEN_ALL_FLAGS)) + return SQFS_ERROR_UNSUPPORTED; + + file = calloc(1, sizeof(*file)); + strm = (sqfs_ostream_t *)file; + if (file == NULL) + return SQFS_ERROR_ALLOC; + + sqfs_object_init(file, file_destroy, NULL); + + file->path = strdup(path); + if (file->path == NULL) { + os_error_t err = get_os_error_state(); + free(file); + set_os_error_state(err); + return SQFS_ERROR_ALLOC; + } + + ret = sqfs_duplicate_native_file(fd, &file->fd); + if (ret) { + os_error_t err = get_os_error_state(); + free(file->path); + free(file); + set_os_error_state(err); + return ret; + } + + sqfs_close_native_file(fd); + + file->flags = flags; + strm->append = file_append; + strm->flush = file_flush; + strm->get_filename = file_get_filename; + + *out = strm; + return 0; +} + +int sqfs_ostream_open_file(sqfs_ostream_t **out, const char *path, + sqfs_u32 flags) +{ + sqfs_file_handle_t fd; + int ret; + + *out = NULL; + if (flags & SQFS_FILE_OPEN_READ_ONLY) + return SQFS_ERROR_ARG_INVALID; + + ret = sqfs_open_native_file(&fd, path, flags); + if (ret) + return ret; + + ret = sqfs_ostream_open_handle(out, path, fd, flags); + if (ret) { + os_error_t err = get_os_error_state(); + sqfs_close_native_file(fd); + set_os_error_state(err); + return ret; + } + + return 0; +} diff --git a/lib/sqfs/src/io/unix.c b/lib/sqfs/src/io/unix.c new file mode 100644 index 0000000..45af2ce --- /dev/null +++ b/lib/sqfs/src/io/unix.c @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * unix.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/io.h" +#include "sqfs/error.h" + +#include +#include +#include + +int sqfs_open_native_file(sqfs_file_handle_t *out, const char *filename, + sqfs_u32 flags) +{ + int open_mode; + + *out = -1; + + if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS) + return SQFS_ERROR_UNSUPPORTED; + + if (flags & SQFS_FILE_OPEN_READ_ONLY) { + open_mode = O_RDONLY; + } else { + open_mode = O_CREAT | O_RDWR; + + if (flags & SQFS_FILE_OPEN_OVERWRITE) { + open_mode |= O_TRUNC; + } else { + open_mode |= O_EXCL; + } + } + + *out = open(filename, open_mode, 0644); + + return (*out < 0) ? SQFS_ERROR_IO : 0; +} + +void sqfs_close_native_file(sqfs_file_handle_t fd) +{ + while (close(fd) != 0 && errno == EINTR) + ; +} + +int sqfs_duplicate_native_file(sqfs_file_handle_t in, sqfs_file_handle_t *out) +{ + *out = dup(in); + return (*out < 0) ? SQFS_ERROR_IO : 0; +} + +int sqfs_seek_native_file(sqfs_file_handle_t fd, + sqfs_s64 offset, sqfs_u32 flags) +{ + int whence; + off_t off; + + switch (flags & SQFS_FILE_SEEK_TYPE_MASK) { + case SQFS_FILE_SEEK_START: whence = SEEK_SET; break; + case SQFS_FILE_SEEK_CURRENT: whence = SEEK_CUR; break; + case SQFS_FILE_SEEK_END: whence = SEEK_END; break; + default: return SQFS_ERROR_UNSUPPORTED; + } + + if (flags & ~(SQFS_FILE_SEEK_FLAG_MASK | SQFS_FILE_SEEK_TYPE_MASK)) + return SQFS_ERROR_UNSUPPORTED; + + off = lseek(fd, offset, whence); + if (off == ((off_t)-1)) { + if (errno == ESPIPE) + return SQFS_ERROR_UNSUPPORTED; + return SQFS_ERROR_IO; + } + + if (flags & SQFS_FILE_SEEK_TRUNCATE) { + while (ftruncate(fd, off) != 0) { + if (errno != EINTR) + return SQFS_ERROR_IO; + } + } + + return 0; +} diff --git a/lib/sqfs/src/io/win32.c b/lib/sqfs/src/io/win32.c new file mode 100644 index 0000000..decfd23 --- /dev/null +++ b/lib/sqfs/src/io/win32.c @@ -0,0 +1,120 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * win32.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/io.h" +#include "sqfs/error.h" +#include "compat.h" + +#define WIN32_LEAN_AND_MEAN +#include + +int sqfs_open_native_file(sqfs_file_handle_t *out, const char *filename, + sqfs_u32 flags) +{ + int access_flags, creation_mode, share_mode; + WCHAR *wpath = NULL; + os_error_t err; + DWORD length; + + *out = INVALID_HANDLE_VALUE; + + if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS) { + SetLastError(ERROR_INVALID_PARAMETER); + return SQFS_ERROR_UNSUPPORTED; + } + + if (flags & SQFS_FILE_OPEN_READ_ONLY) { + access_flags = GENERIC_READ; + creation_mode = OPEN_EXISTING; + share_mode = FILE_SHARE_READ; + } else { + access_flags = GENERIC_READ | GENERIC_WRITE; + share_mode = 0; + + if (flags & SQFS_FILE_OPEN_OVERWRITE) { + creation_mode = CREATE_ALWAYS; + } else { + creation_mode = CREATE_NEW; + } + } + + if (flags & SQFS_FILE_OPEN_NO_CHARSET_XFRM) { + *out = CreateFileA(filename, access_flags, share_mode, NULL, + creation_mode, FILE_ATTRIBUTE_NORMAL, NULL); + } else { + length = MultiByteToWideChar(CP_UTF8, 0, filename, -1, NULL, 0); + if (length <= 0) + return SQFS_ERROR_INTERNAL; + + wpath = calloc(sizeof(wpath[0]), length + 1); + if (wpath == NULL) { + SetLastError(ERROR_NOT_ENOUGH_MEMORY); + return SQFS_ERROR_ALLOC; + } + + MultiByteToWideChar(CP_UTF8, 0, filename, -1, + wpath, length + 1); + wpath[length] = '\0'; + + *out = CreateFileW(wpath, access_flags, share_mode, NULL, + creation_mode, FILE_ATTRIBUTE_NORMAL, + NULL); + + err = get_os_error_state(); + free(wpath); + set_os_error_state(err); + } + + return (*out == INVALID_HANDLE_VALUE) ? SQFS_ERROR_IO : 0; +} + +void sqfs_close_native_file(sqfs_file_handle_t hnd) +{ + CloseHandle(hnd); +} + +int sqfs_duplicate_native_file(sqfs_file_handle_t in, sqfs_file_handle_t *out) +{ + HANDLE hProc = GetCurrentProcess(); + BOOL ret = DuplicateHandle(hProc, in, hProc, out, 0, + FALSE, DUPLICATE_SAME_ACCESS); + + return ret ? 0 : SQFS_ERROR_IO; +} + +int sqfs_seek_native_file(sqfs_file_handle_t fd, + sqfs_s64 offset, sqfs_u32 flags) +{ + LARGE_INTEGER pos; + DWORD whence; + + switch (type & SQFS_FILE_SEEK_TYPE_MASK) { + case SQFS_FILE_SEEK_START: whence = FILE_BEGIN; break; + case SQFS_FILE_SEEK_CURRENT: whence = FILE_CURRENT; break; + case SQFS_FILE_SEEK_END: whence = FILE_END; break; + default: return SQFS_ERROR_UNSUPPORTED; + } + + if (flags & ~(SQFS_FILE_SEEK_FLAG_MASK | SQFS_FILE_SEEK_TYPE_MASK)) + return SQFS_ERROR_UNSUPPORTED; + + if (GetFileType(fd) != FILE_TYPE_DISK) + return SQFS_ERROR_UNSUPPORTED; + + pos.QuadPart = offset; + if (!SetFilePointerEx(fd, pos, NULL, whence)) + return SQFS_ERROR_IO; + + if (flags & SQFS_FILE_SEEK_TRUNCATE) { + if (!SetEndOfFile(fd)) + return SQFS_ERROR_IO; + } + + return 0; +} -- cgit v1.2.3