X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fwim.c;h=b15a02de43881c68b597d5dec778bc67541e0510;hp=4a8e6a8be828c8a5282a0993ea96daf4a0f8293e;hb=4587a5137d9e06b2863e37006f1ebd042eefc0e3;hpb=4b8dbcb1723bacdd692ea57184cb49ce3d2b7774

diff --git a/src/wim.c b/src/wim.c
index 4a8e6a8b..b15a02de 100644
--- a/src/wim.c
+++ b/src/wim.c
@@ -115,22 +115,6 @@ for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
 	return 0;
 }
 
-/* Returns the compression type given in the flags of a WIM header. */
-static int
-wim_hdr_flags_compression_type(int wim_hdr_flags)
-{
-	if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
-		if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
-			return WIMLIB_COMPRESSION_TYPE_LZX;
-		else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
-			return WIMLIB_COMPRESSION_TYPE_XPRESS;
-		else
-			return WIMLIB_COMPRESSION_TYPE_INVALID;
-	} else {
-		return WIMLIB_COMPRESSION_TYPE_NONE;
-	}
-}
-
 /*
  * Creates a WIMStruct for a new WIM file.
  */
@@ -141,6 +125,8 @@ wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 	struct wim_lookup_table *table;
 	int ret;
 
+	wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
+
 	DEBUG("Creating new WIM with %"TS" compression.",
 	      wimlib_get_compression_type_string(ctype));
 
@@ -159,6 +145,8 @@ wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 		goto out_free;
 	}
 	w->lookup_table = table;
+	w->refcnts_ok = 1;
+	w->compression_type = ctype;
 	*w_ret = w;
 	return 0;
 out_free:
@@ -166,12 +154,6 @@ out_free:
 	return ret;
 }
 
-WIMLIBAPI int
-wimlib_get_num_images(const WIMStruct *w)
-{
-	return w->hdr.image_count;
-}
-
 int
 select_wim_image(WIMStruct *w, int image)
 {
@@ -222,13 +204,6 @@ select_wim_image(WIMStruct *w, int image)
 }
 
 
-/* Returns the compression type of the WIM file. */
-WIMLIBAPI int
-wimlib_get_compression_type(const WIMStruct *w)
-{
-	return wim_hdr_flags_compression_type(w->hdr.flags);
-}
-
 WIMLIBAPI const tchar *
 wimlib_get_compression_type_string(int ctype)
 {
@@ -292,7 +267,7 @@ wimlib_print_wim_information(const WIMStruct *w)
 	tputchar(T('\n'));
 	tprintf(T("Image Count:    %d\n"), hdr->image_count);
 	tprintf(T("Compression:    %"TS"\n"),
-		wimlib_get_compression_type_string(wimlib_get_compression_type(w)));
+		wimlib_get_compression_type_string(w->compression_type));
 	tprintf(T("Part Number:    %d/%d\n"), hdr->part_number, hdr->total_parts);
 	tprintf(T("Boot Index:     %d\n"), hdr->boot_idx);
 	tprintf(T("Size:           %"PRIu64" bytes\n"),
@@ -364,34 +339,128 @@ wimlib_print_files(WIMStruct *w, int image)
 	return for_image(w, image, image_print_files);
 }
 
-/* Sets the index of the bootable image. */
 WIMLIBAPI int
-wimlib_set_boot_idx(WIMStruct *wim, int boot_idx)
+wimlib_get_wim_info(WIMStruct *wim, struct wimlib_wim_info *info)
+{
+	memset(info, 0, sizeof(struct wimlib_wim_info));
+	memcpy(info->guid, wim->hdr.guid, WIMLIB_GUID_LEN);
+	info->image_count = wim->hdr.image_count;
+	info->boot_index = wim->hdr.boot_idx;
+	info->wim_version = WIM_VERSION;
+	info->chunk_size = WIM_CHUNK_SIZE;
+	info->part_number = wim->hdr.part_number;
+	info->total_parts = wim->hdr.total_parts;
+	info->compression_type = wim->compression_type;
+	if (wim->wim_info)
+		info->total_bytes = wim->wim_info->total_bytes;
+	else
+		info->total_bytes = 0;
+	info->has_integrity_table = wim->hdr.integrity.offset != 0;
+	info->opened_from_file = (wim->filename != NULL);
+	info->is_readonly == (wim->hdr.flags & WIM_HDR_FLAG_READONLY) ||
+			     (wim->hdr.total_parts != 1) ||
+			     (wim->filename && taccess(wim->filename, W_OK));
+	info->has_rpfix = (wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) != 0;
+	info->is_marked_readonly = (wim->hdr.flags & WIM_HDR_FLAG_READONLY) != 0;
+	info->write_in_progress = (wim->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) != 0;
+	info->metadata_only = (wim->hdr.flags & WIM_HDR_FLAG_METADATA_ONLY) != 0;
+	info->resource_only = (wim->hdr.flags & WIM_HDR_FLAG_RESOURCE_ONLY) != 0;
+	info->spanned = (wim->hdr.flags & WIM_HDR_FLAG_SPANNED) != 0;
+	return 0;
+}
+
+
+/* Deprecated */
+WIMLIBAPI int
+wimlib_get_boot_idx(const WIMStruct *wim)
 {
-	int ret;
+	struct wimlib_wim_info info;
 
-	ret = can_modify_wim(wim);
-	if (ret)
-		return ret;
-	if (boot_idx < 0 || boot_idx > wim->hdr.image_count)
-		return WIMLIB_ERR_INVALID_IMAGE;
-	wim->hdr.boot_idx = boot_idx;
-	return 0;
+	wimlib_get_wim_info((WIMStruct*)wim, &info);
+	return info.boot_index;
+}
+
+/* Deprecated */
+WIMLIBAPI int
+wimlib_get_compression_type(const WIMStruct *wim)
+{
+	struct wimlib_wim_info info;
+
+	wimlib_get_wim_info((WIMStruct*)wim, &info);
+	return info.compression_type;
+}
+
+/* Deprecated */
+WIMLIBAPI int
+wimlib_get_num_images(const WIMStruct *wim)
+{
+	struct wimlib_wim_info info;
+
+	wimlib_get_wim_info((WIMStruct*)wim, &info);
+	return info.image_count;
 }
 
+/* Deprecated */
 WIMLIBAPI int
-wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
+wimlib_get_part_number(const WIMStruct *wim, int *total_parts_ret)
 {
+	struct wimlib_wim_info info;
+
+	wimlib_get_wim_info((WIMStruct*)wim, &info);
 	if (total_parts_ret)
-		*total_parts_ret = w->hdr.total_parts;
-	return w->hdr.part_number;
+		*total_parts_ret = info.total_parts;
+	return info.part_number;
 }
 
+WIMLIBAPI int
+wimlib_set_wim_info(WIMStruct *wim, const struct wimlib_wim_info *info, int which)
+{
+	int ret;
+
+	if (which & WIMLIB_CHANGE_READONLY_FLAG) {
+		if (info->is_marked_readonly)
+			wim->hdr.flags |= WIM_HDR_FLAG_READONLY;
+		else
+			wim->hdr.flags &= ~WIM_HDR_FLAG_READONLY;
+	}
+
+	if ((which & ~WIMLIB_CHANGE_READONLY_FLAG) == 0)
+		return 0;
 
+	ret = can_modify_wim(wim);
+	if (ret)
+		return ret;
+
+	if (which & WIMLIB_CHANGE_GUID)
+		memcpy(wim->hdr.guid, info->guid, WIM_GID_LEN);
+
+	if (which & WIMLIB_CHANGE_BOOT_INDEX) {
+		if (info->boot_index < 0 || info->boot_index > wim->hdr.image_count)
+		{
+			ERROR("%u is not 0 or a valid image in the WIM to mark as bootable",
+			      info->boot_index);
+			return WIMLIB_ERR_INVALID_IMAGE;
+		}
+		wim->hdr.boot_idx = info->boot_index;
+	}
+
+	if (which & WIMLIB_CHANGE_RPFIX_FLAG) {
+		if (info->has_rpfix)
+			wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
+		else
+			wim->hdr.flags &= ~WIM_HDR_FLAG_RP_FIX;
+	}
+	return 0;
+}
+
+/* Deprecated */
 WIMLIBAPI int
-wimlib_get_boot_idx(const WIMStruct *w)
+wimlib_set_boot_idx(WIMStruct *wim, int boot_idx)
 {
-	return w->hdr.boot_idx;
+	struct wimlib_wim_info info;
+
+	info.boot_index = boot_idx;
+	return wimlib_set_wim_info(wim, &info, WIMLIB_CHANGE_BOOT_INDEX);
 }
 
 static int
@@ -463,10 +532,28 @@ begin_read(WIMStruct *w, const tchar *in_wim_path, int open_flags,
 			return WIMLIB_ERR_OPEN;
 	}
 
-	ret = read_header(w->filename, w->in_fd, &w->hdr, open_flags);
+	ret = read_header(w->filename, w->in_fd, &w->hdr);
 	if (ret)
 		return ret;
 
+	if (w->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) {
+		WARNING("The WIM_HDR_FLAG_WRITE_IN_PROGRESS is set in the header of \"%"TS"\".\n"
+			"          It may be being changed by another process, or a process\n"
+			"          may have crashed while writing the WIM.", in_wim_path);
+	}
+
+	if (open_flags & WIMLIB_OPEN_FLAG_WRITE_ACCESS) {
+		ret = can_modify_wim(w);
+		if (ret)
+			return ret;
+	}
+
+	if (w->hdr.total_parts != 1 && !(open_flags & WIMLIB_OPEN_FLAG_SPLIT_OK)) {
+		ERROR("\"%"TS"\": This WIM is part %u of a %u-part WIM",
+		      in_wim_path, w->hdr.part_number, w->hdr.total_parts);
+		return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+	}
+
 	DEBUG("According to header, WIM contains %u images", w->hdr.image_count);
 
 	/* If the boot index is invalid, print a warning and set it to 0 */
@@ -477,10 +564,25 @@ begin_read(WIMStruct *w, const tchar *in_wim_path, int open_flags,
 		w->hdr.boot_idx = 0;
 	}
 
-	if (wimlib_get_compression_type(w) == WIMLIB_COMPRESSION_TYPE_INVALID) {
-		ERROR("Invalid compression type (WIM header flags = 0x%x)",
-		      w->hdr.flags);
-		return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
+	/* Check and cache the compression type */
+	if (w->hdr.flags & WIM_HDR_FLAG_COMPRESSION) {
+		if (w->hdr.flags & WIM_HDR_FLAG_COMPRESS_LZX) {
+			if (w->hdr.flags & WIM_HDR_FLAG_COMPRESS_XPRESS) {
+				ERROR("Multiple compression flags are set in \"%"TS"\"",
+				      in_wim_path);
+				return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
+			}
+			w->compression_type = WIMLIB_COMPRESSION_TYPE_LZX;
+		} else if (w->hdr.flags & WIM_HDR_FLAG_COMPRESS_XPRESS) {
+			w->compression_type = WIMLIB_COMPRESSION_TYPE_XPRESS;
+		} else {
+			ERROR("The compression flag is set on \"%"TS"\", but "
+			      "neither the XPRESS nor LZX flag is set",
+			      in_wim_path);
+			return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
+		}
+	} else {
+		BUILD_BUG_ON(WIMLIB_COMPRESSION_TYPE_NONE != 0);
 	}
 
 	if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
@@ -528,24 +630,33 @@ begin_read(WIMStruct *w, const tchar *in_wim_path, int open_flags,
  */
 WIMLIBAPI int
 wimlib_open_wim(const tchar *wim_file, int open_flags,
-		WIMStruct **w_ret,
+		WIMStruct **wim_ret,
 		wimlib_progress_func_t progress_func)
 {
-	WIMStruct *w;
+	WIMStruct *wim;
 	int ret;
 
-	if (!wim_file || !w_ret)
-		return WIMLIB_ERR_INVALID_PARAM;
+	wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
 
-	w = new_wim_struct();
-	if (!w)
-		return WIMLIB_ERR_NOMEM;
+	ret = WIMLIB_ERR_INVALID_PARAM;
+	if (!wim_file || !wim_ret)
+		goto out;
 
-	ret = begin_read(w, wim_file, open_flags, progress_func);
-	if (ret == 0)
-		*w_ret = w;
-	else
-		wimlib_free(w);
+	ret = WIMLIB_ERR_NOMEM;
+	wim = new_wim_struct();
+	if (!wim)
+		goto out;
+
+	ret = begin_read(wim, wim_file, open_flags, progress_func);
+	if (ret)
+		goto out_wimlib_free;
+
+	ret = 0;
+	*wim_ret = wim;
+	goto out;
+out_wimlib_free:
+	wimlib_free(wim);
+out:
 	return ret;
 }
 
@@ -672,31 +783,60 @@ wim_checksum_unhashed_streams(WIMStruct *w)
 	return 0;
 }
 
+/*
+ * can_modify_wim - Check if a given WIM is writeable.  This is only the case if
+ * it meets the following three conditions:
+ *
+ * 1. Write access is allowed to the underlying file (if any) at the filesystem level.
+ * 2. The WIM is not part of a spanned set.
+ * 3. The WIM_HDR_FLAG_READONLY flag is not set in the WIM header.
+ *
+ * Return value is 0 if writable; WIMLIB_ERR_WIM_IS_READONLY otherwise.
+ */
 int
 can_modify_wim(WIMStruct *wim)
 {
+	if (wim->filename) {
+		if (taccess(wim->filename, W_OK)) {
+			ERROR_WITH_ERRNO("Can't modify \"%"TS"\"", wim->filename);
+			return WIMLIB_ERR_WIM_IS_READONLY;
+		}
+	}
 	if (wim->hdr.total_parts != 1) {
 		ERROR("Cannot modify \"%"TS"\": is part of a spanned set",
 		      wim->filename);
-		return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+		return WIMLIB_ERR_WIM_IS_READONLY;
 	}
 	if (wim->hdr.flags & WIM_HDR_FLAG_READONLY) {
 		ERROR("Cannot modify \"%"TS"\": is marked read-only",
 		      wim->filename);
-		return WIMLIB_ERR_WIM_IS_MARKED_READONLY;
+		return WIMLIB_ERR_WIM_IS_READONLY;
 	}
 	return 0;
 }
 
+/*
+ * can_delete_from_wim - Check if files or images can be deleted from a given
+ * WIM file.
+ *
+ * This theoretically should be exactly the same as can_modify_wim(), but
+ * unfortunately, due to bugs in Microsoft's software that generate incorrect
+ * reference counts for some WIM resources, we need to run expensive
+ * verifications to make sure the reference counts are correct on all WIM
+ * resources.  Otherwise we might delete a WIM resource whose reference count
+ * has fallen to 0, but is actually still referenced somewhere.
+ */
 int
 can_delete_from_wim(WIMStruct *wim)
 {
 	int ret;
 
 	ret = can_modify_wim(wim);
-	if (ret == 0 && !wim->all_images_verified)
-		ret = wim_run_full_verifications(wim);
-	return ret;
+	if (ret)
+		return ret;
+	if (!wim->refcnts_ok)
+		wim_recalculate_refcnts(wim);
+	return 0;
 }
 
 /* Frees the memory for the WIMStruct, including all internal memory; also
@@ -744,6 +884,10 @@ test_locale_ctype_utf8(void)
 WIMLIBAPI int
 wimlib_global_init(int init_flags)
 {
+	static bool already_inited = false;
+
+	if (already_inited)
+		return 0;
 	libxml_global_init();
 	if (!(init_flags & WIMLIB_INIT_FLAG_ASSUME_UTF8)) {
 		wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
@@ -755,6 +899,7 @@ wimlib_global_init(int init_flags)
 #ifdef __WIN32__
 	win32_global_init();
 #endif
+	already_inited = true;
 	return 0;
 }