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1110 kaklik 1  
2 /*
3 * Copyright (c) 2006-2007 by Roland Riegel <feedback@roland-riegel.de>
4 *
5 * This file is free software; you can redistribute it and/or modify
6 * it under the terms of either the GNU General Public License version 2
7 * or the GNU Lesser General Public License version 2.1, both as
8 * published by the Free Software Foundation.
9 */
10  
11 #ifndef PARTITION_H
12 #define PARTITION_H
13  
14 #include <stdint.h>
15  
16 /**
17 * \addtogroup partition
18 *
19 * @{
20 */
21 /**
22 * \file
23 * Partition table header (license: GPLv2 or LGPLv2.1)
24 *
25 * \author Roland Riegel
26 */
27  
28 /**
29 * The partition table entry is not used.
30 */
31 #define PARTITION_TYPE_FREE 0x00
32 /**
33 * The partition contains a FAT12 filesystem.
34 */
35 #define PARTITION_TYPE_FAT12 0x01
36 /**
37 * The partition contains a FAT16 filesystem with 32MB maximum.
38 */
39 #define PARTITION_TYPE_FAT16_32MB 0x04
40 /**
41 * The partition is an extended partition with its own partition table.
42 */
43 #define PARTITION_TYPE_EXTENDED 0x05
44 /**
45 * The partition contains a FAT16 filesystem.
46 */
47 #define PARTITION_TYPE_FAT16 0x06
48 /**
49 * The partition contains a FAT32 filesystem.
50 */
51 #define PARTITION_TYPE_FAT32 0x0b
52 /**
53 * The partition contains a FAT32 filesystem with LBA.
54 */
55 #define PARTITION_TYPE_FAT32_LBA 0x0c
56 /**
57 * The partition contains a FAT16 filesystem with LBA.
58 */
59 #define PARTITION_TYPE_FAT16_LBA 0x0e
60 /**
61 * The partition is an extended partition with LBA.
62 */
63 #define PARTITION_TYPE_EXTENDED_LBA 0x0f
64 /**
65 * The partition has an unknown type.
66 */
67 #define PARTITION_TYPE_UNKNOWN 0xff
68  
69 /**
70 * A function pointer used to read from the partition.
71 *
72 * \param[in] offset The offset on the device where to start reading.
73 * \param[out] buffer The buffer into which to place the data.
74 * \param[in] length The count of bytes to read.
75 */
76 typedef uint8_t (*device_read_t)(uint32_t offset, uint8_t* buffer, uint16_t length);
77 /**
78 * A function pointer passed to a \c device_read_interval_t.
79 *
80 * \param[in] buffer The buffer which contains the data just read.
81 * \param[in] offset The offset from which the data in \c buffer was read.
82 * \param[in] p An opaque pointer.
83 * \see device_read_interval_t
84 */
85 typedef uint8_t (*device_read_callback_t)(uint8_t* buffer, uint32_t offset, void* p);
86 /**
87 * A function pointer used to continuously read units of \c interval bytes
88 * and call a callback function.
89 *
90 * This function starts reading at the specified offset. Every \c interval bytes,
91 * it calls the callback function with the associated data buffer.
92 *
93 * By returning zero, the callback may stop reading.
94 *
95 * \param[in] offset Offset from which to start reading.
96 * \param[in] buffer Pointer to a buffer which is at least interval bytes in size.
97 * \param[in] interval Number of bytes to read before calling the callback function.
98 * \param[in] length Number of bytes to read altogether.
99 * \param[in] callback The function to call every interval bytes.
100 * \param[in] p An opaque pointer directly passed to the callback function.
101 * \returns 0 on failure, 1 on success
102 * \see device_read_t
103 */
104 typedef uint8_t (*device_read_interval_t)(uint32_t offset, uint8_t* buffer, uint16_t interval, uint16_t length, device_read_callback_t callback, void* p);
105 /**
106 * A function pointer used to write to the partition.
107 *
108 * \param[in] offset The offset on the device where to start writing.
109 * \param[in] buffer The buffer which to write.
110 * \param[in] length The count of bytes to write.
111 */
112 typedef uint8_t (*device_write_t)(uint32_t offset, const uint8_t* buffer, uint16_t length);
113 /**
114 * A function pointer passed to a \c device_write_interval_t.
115 *
116 * \param[in] buffer The buffer which receives the data to write.
117 * \param[in] offset The offset to which the data in \c buffer will be written.
118 * \param[in] p An opaque pointer.
119 * \returns The number of bytes put into \c buffer
120 * \see device_write_interval_t
121 */
122 typedef uint16_t (*device_write_callback_t)(uint8_t* buffer, uint32_t offset, void* p);
123 /**
124 * A function pointer used to continuously write a data stream obtained from
125 * a callback function.
126 *
127 * This function starts writing at the specified offset. To obtain the
128 * next bytes to write, it calls the callback function. The callback fills the
129 * provided data buffer and returns the number of bytes it has put into the buffer.
130 *
131 * By returning zero, the callback may stop writing.
132 *
133 * \param[in] offset Offset where to start writing.
134 * \param[in] buffer Pointer to a buffer which is used for the callback function.
135 * \param[in] length Number of bytes to write in total. May be zero for endless writes.
136 * \param[in] callback The function used to obtain the bytes to write.
137 * \param[in] p An opaque pointer directly passed to the callback function.
138 * \returns 0 on failure, 1 on success
139 * \see device_write_t
140 */
141 typedef uint8_t (*device_write_interval_t)(uint32_t offset, uint8_t* buffer, uint16_t length, device_write_callback_t callback, void* p);
142  
143 /**
144 * Describes a partition.
145 */
146 struct partition_struct
147 {
148 /**
149 * The function which reads data from the partition.
150 *
151 * \note The offset given to this function is relative to the whole disk,
152 * not to the start of the partition.
153 */
154 device_read_t device_read;
155 /**
156 * The function which repeatedly reads a constant amount of data from the partition.
157 *
158 * \note The offset given to this function is relative to the whole disk,
159 * not to the start of the partition.
160 */
161 device_read_interval_t device_read_interval;
162 /**
163 * The function which writes data to the partition.
164 *
165 * \note The offset given to this function is relative to the whole disk,
166 * not to the start of the partition.
167 */
168 device_write_t device_write;
169 /**
170 * The function which repeatedly writes data to the partition.
171 *
172 * \note The offset given to this function is relative to the whole disk,
173 * not to the start of the partition.
174 */
175 device_write_interval_t device_write_interval;
176  
177 /**
178 * The type of the partition.
179 *
180 * Compare this value to the PARTITION_TYPE_* constants.
181 */
182 uint8_t type;
183 /**
184 * The offset in bytes on the disk where this partition starts.
185 */
186 uint32_t offset;
187 /**
188 * The length in bytes of this partition.
189 */
190 uint32_t length;
191 };
192  
193 struct partition_struct* partition_open(device_read_t device_read, device_read_interval_t device_read_interval, device_write_t device_write, device_write_interval_t device_write_interval, int8_t index);
194 uint8_t partition_close(struct partition_struct* partition);
195  
196 /**
197 * @}
198 */
199  
200 #endif
201