wimboot.c: Dynamically size extents and drive_info arrays
authorEric Biggers <ebiggers3@gmail.com>
Tue, 14 Oct 2014 02:26:40 +0000 (21:26 -0500)
committerEric Biggers <ebiggers3@gmail.com>
Tue, 14 Oct 2014 02:37:33 +0000 (21:37 -0500)
I figured a limit of 8 partitions is good enough, but for some reason
Windows returns 4 times as many partitions as there actually are.
Whatever, just remove the fixed limit.

NEWS
src/wimboot.c

diff --git a/NEWS b/NEWS
index 47db515..c50cf7a 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,9 @@ Version 1.7.3-BETA:
        The library now permits making in-memory changes to a WIMStruct backed
        by a read-only WIM file.
 
+       Extraction in "WIMBoot mode" without the WOF driver available no longer
+       fails if the disk containing the WIM file has too many partitions.
+
 Version 1.7.2:
        Made more improvements to the XPRESS, LZX, and LZMS compressors.
 
index cff73e8..3562890 100644 (file)
@@ -75,19 +75,17 @@ query_device(HANDLE h, DWORD code, void *out, DWORD out_size)
  */
 static int
 query_partition_and_disk_info(const wchar_t *path,
-                             PARTITION_INFORMATION_EX *part_info_ret,
+                             PARTITION_INFORMATION_EX *part_info,
                              DRIVE_LAYOUT_INFORMATION_EX *drive_info_ret)
 {
-       HANDLE h;
        wchar_t vol_name[] = L"\\\\.\\X:";
        wchar_t disk_name[] = L"\\\\?\\PhysicalDriveXXXXXXXXXX";
-
-       PARTITION_INFORMATION_EX part_info;
-       size_t extents_size = sizeof(VOLUME_DISK_EXTENTS) + 4 * sizeof(DISK_EXTENT);
-       VOLUME_DISK_EXTENTS *extents = alloca(extents_size);
-       size_t drive_info_size = sizeof(DRIVE_LAYOUT_INFORMATION_EX) +
-                                       8 * sizeof(PARTITION_INFORMATION_EX);
-       DRIVE_LAYOUT_INFORMATION_EX *drive_info = alloca(drive_info_size);
+       HANDLE h = INVALID_HANDLE_VALUE;
+       VOLUME_DISK_EXTENTS *extents = NULL;
+       size_t extents_size;
+       DRIVE_LAYOUT_INFORMATION_EX *drive_info = NULL;
+       size_t drive_info_size;
+       int ret;
 
        wimlib_assert(path[0] != L'\0' && path[1] == L':');
 
@@ -95,36 +93,51 @@ query_partition_and_disk_info(const wchar_t *path,
 
        h = open_file(vol_name, GENERIC_READ);
        if (h == INVALID_HANDLE_VALUE) {
-               set_errno_from_GetLastError();
-               ERROR_WITH_ERRNO("\"%ls\": Can't open volume device", vol_name);
-               return WIMLIB_ERR_OPEN;
+               ERROR("\"%ls\": Can't open volume device (err=%"PRIu32")",
+                     vol_name, (u32)GetLastError());
+               ret = WIMLIB_ERR_OPEN;
+               goto out;
        }
 
        if (!query_device(h, IOCTL_DISK_GET_PARTITION_INFO_EX,
-                         &part_info, sizeof(part_info)))
+                         part_info, sizeof(PARTITION_INFORMATION_EX)))
        {
-               ERROR("\"%ls\": Can't get partition info (err=0x%08"PRIx32")",
+               ERROR("\"%ls\": Can't get partition info (err=%"PRIu32")",
                      vol_name, (u32)GetLastError());
-               CloseHandle(h);
-               return WIMLIB_ERR_READ;
+               ret = WIMLIB_ERR_READ;
+               goto out;
        }
 
-       if (!query_device(h, IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
-                         extents, extents_size))
-       {
-               ERROR("\"%ls\": Can't get volume extent info (err=0x%08"PRIx32")",
-                     vol_name, (u32)GetLastError());
-               CloseHandle(h);
-               return WIMLIB_ERR_READ;
+       extents_size = sizeof(VOLUME_DISK_EXTENTS);
+       for (;;) {
+               extents_size += 4 * sizeof(DISK_EXTENT);
+               extents = MALLOC(extents_size);
+               if (!extents) {
+                       ret = WIMLIB_ERR_NOMEM;
+                       goto out;
+               }
+
+               if (query_device(h, IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
+                                extents, extents_size))
+                       break;
+               if (GetLastError() != ERROR_MORE_DATA) {
+                       ERROR("\"%ls\": Can't get volume extent info (err="PRIu32")",
+                             vol_name, (u32)GetLastError());
+                       ret = WIMLIB_ERR_READ;
+                       goto out;
+               }
+               FREE(extents);
        }
 
        CloseHandle(h);
+       h = INVALID_HANDLE_VALUE;
 
        if (extents->NumberOfDiskExtents != 1) {
                ERROR("\"%ls\": This volume has %"PRIu32" disk extents, "
                      "but this code is untested for more than 1",
                      vol_name, (u32)extents->NumberOfDiskExtents);
-               return WIMLIB_ERR_UNSUPPORTED;
+               ret = WIMLIB_ERR_UNSUPPORTED;
+               goto out;
        }
 
        wsprintf(wcschr(disk_name, L'X'), L"%"PRIu32,
@@ -132,52 +145,74 @@ query_partition_and_disk_info(const wchar_t *path,
 
        h = open_file(disk_name, GENERIC_READ);
        if (h == INVALID_HANDLE_VALUE) {
-               set_errno_from_GetLastError();
-               ERROR_WITH_ERRNO("\"%ls\": Can't open disk device", disk_name);
-               return WIMLIB_ERR_OPEN;
+               ERROR("\"%ls\": Can't open disk device (err=%"PRIu32")",
+                     disk_name, (u32)GetLastError());
+               ret = WIMLIB_ERR_OPEN;
+               goto out;
        }
 
-       if (!query_device(h, IOCTL_DISK_GET_DRIVE_LAYOUT_EX,
-                         drive_info, drive_info_size))
-       {
-               ERROR("\"%ls\": Can't get disk info (err=0x%08"PRIx32")",
-                     disk_name, (u32)GetLastError());
-               CloseHandle(h);
-               return WIMLIB_ERR_READ;
+       drive_info_size = sizeof(DRIVE_LAYOUT_INFORMATION_EX);
+       for (;;) {
+               drive_info_size += 4 * sizeof(PARTITION_INFORMATION_EX);
+               drive_info = MALLOC(drive_info_size);
+               if (!drive_info) {
+                       ret = WIMLIB_ERR_NOMEM;
+                       goto out;
+               }
+
+               if (query_device(h, IOCTL_DISK_GET_DRIVE_LAYOUT_EX,
+                                drive_info, drive_info_size))
+                       break;
+               if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+                       ERROR("\"%ls\": Can't get disk info (err=%"PRIu32")",
+                             disk_name, (u32)GetLastError());
+                       ret = WIMLIB_ERR_READ;
+                       goto out;
+               }
+               FREE(drive_info);
        }
 
+       *drive_info_ret = *drive_info;  /* doesn't include partitions */
        CloseHandle(h);
+       h = INVALID_HANDLE_VALUE;
 
-       if (drive_info->PartitionStyle != part_info.PartitionStyle) {
+       if (drive_info->PartitionStyle != part_info->PartitionStyle) {
                ERROR("\"%ls\", \"%ls\": Inconsistent partition table type!",
                      vol_name, disk_name);
-               return WIMLIB_ERR_UNSUPPORTED;
+               ret = WIMLIB_ERR_UNSUPPORTED;
+               goto out;
        }
 
-       if (part_info.PartitionStyle == PARTITION_STYLE_GPT) {
-               BUILD_BUG_ON(sizeof(part_info.Gpt.PartitionId) !=
+       if (part_info->PartitionStyle == PARTITION_STYLE_GPT) {
+               BUILD_BUG_ON(sizeof(part_info->Gpt.PartitionId) !=
                             sizeof(drive_info->Gpt.DiskId));
-               if (!memcmp(&part_info.Gpt.PartitionId,
+               if (!memcmp(&part_info->Gpt.PartitionId,
                            &drive_info->Gpt.DiskId,
                            sizeof(drive_info->Gpt.DiskId)))
                {
                        ERROR("\"%ls\", \"%ls\": Partition GUID is the "
                              "same as the disk GUID???", vol_name, disk_name);
-                       return WIMLIB_ERR_UNSUPPORTED;
+                       ret = WIMLIB_ERR_UNSUPPORTED;
+                       goto out;
                }
        }
 
-       if (part_info.PartitionStyle != PARTITION_STYLE_MBR &&
-           part_info.PartitionStyle != PARTITION_STYLE_GPT)
+       if (part_info->PartitionStyle != PARTITION_STYLE_MBR &&
+           part_info->PartitionStyle != PARTITION_STYLE_GPT)
        {
                ERROR("\"%ls\": Unknown partition style 0x%08"PRIx32,
-                     vol_name, (u32)part_info.PartitionStyle);
-               return WIMLIB_ERR_UNSUPPORTED;
+                     vol_name, (u32)part_info->PartitionStyle);
+               ret = WIMLIB_ERR_UNSUPPORTED;
+               goto out;
        }
 
-       *part_info_ret = part_info;
-       *drive_info_ret = *drive_info;
-       return 0;
+       ret = 0;
+out:
+       FREE(extents);
+       FREE(drive_info);
+       if (h != INVALID_HANDLE_VALUE)
+               CloseHandle(h);
+       return ret;
 }
 
 /*