src/system/boot/loader/file_systems/amiga_ffs/Volume.cpp

   1 /*
   2  * Copyright 2003-2013, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "Volume.h"
   8 #include "Directory.h"
   9
  10 #include <boot/partitions.h>
  11 #include <boot/platform.h>
  12
  13 #include <string.h>
  14 #include <unistd.h>
  15 #include <fcntl.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18
  19
  20 using namespace FFS;
  21 using std::nothrow;
  22
  23
  24 Volume::Volume(boot::Partition *partition)
  25         :
  26         fRoot(NULL)
  27 {
  28         if ((fDevice = open_node(partition, O_RDONLY)) < B_OK)
  29                 return;
  30
  31         if (read_pos(fDevice, 0, &fType, sizeof(int32)) < B_OK)
  32                 return;
  33
  34         fType = B_BENDIAN_TO_HOST_INT32(fType);
  35
  36         switch (fType) {
  37                 case DT_AMIGA_FFS:
  38                 case DT_AMIGA_FFS_INTL:
  39                 case DT_AMIGA_FFS_DCACHE:
  40                         break;
  41
  42                 case DT_AMIGA_OFS:
  43                         printf("The Amiga OFS is not yet supported.\n");
  44                         return;
  45                 default:
  46                         // unsupported file system
  47                         //printf("amiga_ffs: unsupported: %08lx\n", fType);
  48                         return;
  49         }
  50
  51         char *buffer = (char *)malloc(4096);
  52         if (buffer == NULL)
  53                 return;
  54
  55         int32 blockSize = partition->block_size;
  56         if (get_root_block(fDevice, buffer, blockSize, partition->size) != B_OK) {
  57                 // try to get the root block at different sizes, if the
  58                 // block size was incorrectly passed from the partitioning
  59                 // system
  60                 for (int32 size = 512; size <= 4096; size <<= 1) {
  61                         if (get_root_block(fDevice, buffer, size, partition->size) == B_OK) {
  62                                 blockSize = size;
  63                                 break;
  64                         } else if (size >= 4096) {
  65                                 puts("Could not find root block\n");
  66                                 free(buffer);
  67                                 return;
  68                         }
  69                 }
  70         }
  71
  72         char *newBuffer = (char *)realloc(buffer, blockSize);
  73                 // if reallocation fails, we keep the old buffer
  74         if (newBuffer != NULL)
  75                 buffer = newBuffer;
  76
  77         fRootNode.SetTo(buffer, blockSize);
  78         fRoot = new(nothrow) Directory(*this, fRootNode);
  79                 // fRoot will free the buffer for us upon destruction
  80 }
  81
  82
  83 Volume::~Volume()
  84 {
  85         delete fRoot;
  86         close(fDevice);
  87 }
  88
  89
  90 status_t
  91 Volume::InitCheck()
  92 {
  93         if (fRoot != NULL)
  94                 return fRootNode.ValidateCheckSum();
  95
  96         return B_ERROR;
  97 }
  98
  99
 100 //      #pragma mark -
 101
 102
 103 float
 104 amiga_ffs_identify_file_system(boot::Partition *partition)
 105 {
 106         Volume volume(partition);
 107
 108         return volume.InitCheck() < B_OK ? 0 : 0.8;
 109 }
 110
 111
 112 static status_t
 113 amiga_ffs_get_file_system(boot::Partition *partition, ::Directory **_root)
 114 {
 115         Volume *volume = new(nothrow) Volume(partition);
 116         if (volume == NULL)
 117                 return B_NO_MEMORY;
 118
 119         if (volume->InitCheck() < B_OK) {
 120                 delete volume;
 121                 return B_ERROR;
 122         }
 123
 124         *_root = volume->Root();
 125         return B_OK;
 126 }
 127
 128
 129 file_system_module_info gAmigaFFSFileSystemModule = {
 130         "file_systems/amiga_ffs/v1",
 131         kPartitionTypeAmigaFFS,
 132         amiga_ffs_identify_file_system,
 133         amiga_ffs_get_file_system
 134 };
 135