First Commit

3rdparty/libzip/lib/zip_source_file_win32.c

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+/*
+  zip_source_file_win32.c -- read-only Windows file source implementation
+  Copyright (C) 1999-2023 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <info@libzip.org>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in
+  the documentation and/or other materials provided with the
+  distribution.
+  3. The names of the authors may not be used to endorse or promote
+  products derived from this software without specific prior
+  written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "zip_source_file_win32.h"
+
+static bool _zip_win32_op_stat(zip_source_file_context_t *ctx, zip_source_file_stat_t *st);
+
+static bool _zip_stat_win32(zip_source_file_context_t *ctx, zip_source_file_stat_t *st, HANDLE h);
+
+/* clang-format off */
+
+static zip_source_file_operations_t ops_win32_read = {
+    _zip_win32_op_close,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    _zip_win32_op_read,
+    NULL,
+    NULL,
+    _zip_win32_op_seek,
+    _zip_win32_op_stat,
+    NULL,
+    _zip_win32_op_tell,
+    NULL
+};
+
+/* clang-format on */
+
+ZIP_EXTERN zip_source_t *
+zip_source_win32handle(zip_t *za, HANDLE h, zip_uint64_t start, zip_int64_t len) {
+    if (za == NULL) {
+        return NULL;
+    }
+
+    return zip_source_win32handle_create(h, start, len, &za->error);
+}
+
+
+ZIP_EXTERN zip_source_t *
+zip_source_win32handle_create(HANDLE h, zip_uint64_t start, zip_int64_t length, zip_error_t *error) {
+    if (h == INVALID_HANDLE_VALUE || length < ZIP_LENGTH_UNCHECKED) {
+        zip_error_set(error, ZIP_ER_INVAL, 0);
+        return NULL;
+    }
+
+    return zip_source_file_common_new(NULL, h, start, length, NULL, &ops_win32_read, NULL, error);
+}
+
+
+void
+_zip_win32_op_close(zip_source_file_context_t *ctx) {
+    CloseHandle((HANDLE)ctx->f);
+}
+
+
+zip_int64_t
+_zip_win32_op_read(zip_source_file_context_t *ctx, void *buf, zip_uint64_t len) {
+    DWORD i;
+
+    /* TODO: cap len to "DWORD_MAX" */
+    if (!ReadFile((HANDLE)ctx->f, buf, (DWORD)len, &i, NULL)) {
+        zip_error_set(&ctx->error, ZIP_ER_READ, _zip_win32_error_to_errno(GetLastError()));
+        return -1;
+    }
+
+    return (zip_int64_t)i;
+}
+
+
+bool
+_zip_win32_op_seek(zip_source_file_context_t *ctx, void *f, zip_int64_t offset, int whence) {
+    LARGE_INTEGER li;
+    DWORD method;
+
+    switch (whence) {
+    case SEEK_SET:
+        method = FILE_BEGIN;
+        break;
+    case SEEK_END:
+        method = FILE_END;
+        break;
+    case SEEK_CUR:
+        method = FILE_CURRENT;
+        break;
+    default:
+        zip_error_set(&ctx->error, ZIP_ER_SEEK, EINVAL);
+        return false;
+    }
+
+    li.QuadPart = (LONGLONG)offset;
+    if (!SetFilePointerEx((HANDLE)f, li, NULL, method)) {
+        zip_error_set(&ctx->error, ZIP_ER_SEEK, _zip_win32_error_to_errno(GetLastError()));
+        return false;
+    }
+
+    return true;
+}
+
+
+static bool
+_zip_win32_op_stat(zip_source_file_context_t *ctx, zip_source_file_stat_t *st) {
+    return _zip_stat_win32(ctx, st, (HANDLE)ctx->f);
+}
+
+
+zip_int64_t
+_zip_win32_op_tell(zip_source_file_context_t *ctx, void *f) {
+    LARGE_INTEGER zero;
+    LARGE_INTEGER new_offset;
+
+    zero.QuadPart = 0;
+    if (!SetFilePointerEx((HANDLE)f, zero, &new_offset, FILE_CURRENT)) {
+        zip_error_set(&ctx->error, ZIP_ER_SEEK, _zip_win32_error_to_errno(GetLastError()));
+        return -1;
+    }
+
+    return (zip_int64_t)new_offset.QuadPart;
+}
+
+
+int
+_zip_win32_error_to_errno(DWORD win32err) {
+    /* Note: This list isn't exhaustive, but should cover common cases. */
+    switch (win32err) {
+    case ERROR_INVALID_PARAMETER:
+        return EINVAL;
+    case ERROR_FILE_NOT_FOUND:
+    case ERROR_PATH_NOT_FOUND:
+        return ENOENT;
+    case ERROR_INVALID_HANDLE:
+        return EBADF;
+    case ERROR_ACCESS_DENIED:
+        return EACCES;
+    case ERROR_FILE_EXISTS:
+        return EEXIST;
+    case ERROR_TOO_MANY_OPEN_FILES:
+        return EMFILE;
+    case ERROR_DISK_FULL:
+        return ENOSPC;
+    default:
+        return 10000 + win32err;
+    }
+}
+
+
+static bool
+_zip_stat_win32(zip_source_file_context_t *ctx, zip_source_file_stat_t *st, HANDLE h) {
+    FILETIME mtimeft;
+    time_t mtime;
+    LARGE_INTEGER size;
+
+    if (!GetFileTime(h, NULL, NULL, &mtimeft)) {
+        zip_error_set(&ctx->error, ZIP_ER_READ, _zip_win32_error_to_errno(GetLastError()));
+        return false;
+    }
+    if (!_zip_filetime_to_time_t(mtimeft, &mtime)) {
+        zip_error_set(&ctx->error, ZIP_ER_READ, ERANGE);
+        return false;
+    }
+
+    st->exists = true;
+    st->mtime = mtime;
+
+    if (GetFileType(h) == FILE_TYPE_DISK) {
+        st->regular_file = 1;
+
+        if (!GetFileSizeEx(h, &size)) {
+            zip_error_set(&ctx->error, ZIP_ER_READ, _zip_win32_error_to_errno(GetLastError()));
+            return false;
+        }
+
+        st->size = (zip_uint64_t)size.QuadPart;
+    }
+
+    /* TODO: fill in ctx->attributes */
+
+    return true;
+}
+
+
+bool
+_zip_filetime_to_time_t(FILETIME ft, time_t *t) {
+    /*
+    Inspired by http://stackoverflow.com/questions/6161776/convert-windows-filetime-to-second-in-unix-linux
+    */
+    const zip_int64_t WINDOWS_TICK = 10000000LL;
+    const zip_int64_t SEC_TO_UNIX_EPOCH = 11644473600LL;
+    ULARGE_INTEGER li;
+    zip_int64_t secs;
+    time_t temp;
+
+    li.LowPart = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+    secs = (li.QuadPart / WINDOWS_TICK - SEC_TO_UNIX_EPOCH);
+
+    temp = (time_t)secs;
+    if (secs != (zip_int64_t)temp) {
+        return false;
+    }
+
+    *t = temp;
+    return true;
+}