Simple RAM file system.
Dependents: modem_ref_helper_for_v5_3_217 modem_ref_helper
ram_fs.cpp@3:1bc9159847ab, 2017-05-12 (annotated)
- Committer:
- Jeej
- Date:
- Fri May 12 13:33:37 2017 +0000
- Revision:
- 3:1bc9159847ab
- Parent:
- 2:91473a2fac1c
- Child:
- 4:58ee8b15988b
Update file when already in list.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Jeej | 0:befc17558de9 | 1 | #include "ram_fs.h" |
Jeej | 0:befc17558de9 | 2 | #include "WizziDebug.h" |
Jeej | 0:befc17558de9 | 3 | |
Jeej | 2:91473a2fac1c | 4 | #if 0 |
Jeej | 2:91473a2fac1c | 5 | #define RAM_FS_PRINT(...) PRINT(__VA_ARGS__) |
Jeej | 2:91473a2fac1c | 6 | #else |
Jeej | 2:91473a2fac1c | 7 | #define RAM_FS_PRINT(...); |
Jeej | 2:91473a2fac1c | 8 | #endif |
Jeej | 2:91473a2fac1c | 9 | |
Jeej | 0:befc17558de9 | 10 | static ram_fs_file_t* g_fs = NULL; |
Jeej | 0:befc17558de9 | 11 | |
Jeej | 3:1bc9159847ab | 12 | static void ram_fs_update(ram_fs_file_t** file, ram_fs_file_t* file_new) |
Jeej | 0:befc17558de9 | 13 | { |
Jeej | 0:befc17558de9 | 14 | if (*file == NULL) |
Jeej | 0:befc17558de9 | 15 | { |
Jeej | 3:1bc9159847ab | 16 | // Append new file |
Jeej | 0:befc17558de9 | 17 | *file = file_new; |
Jeej | 0:befc17558de9 | 18 | return; |
Jeej | 0:befc17558de9 | 19 | } |
Jeej | 0:befc17558de9 | 20 | |
Jeej | 3:1bc9159847ab | 21 | if ((*file)->file_id == file_new->file_id) |
Jeej | 3:1bc9159847ab | 22 | { |
Jeej | 3:1bc9159847ab | 23 | // Update existing file |
Jeej | 3:1bc9159847ab | 24 | (*file)->header = file_new->header; |
Jeej | 3:1bc9159847ab | 25 | (*file)->data = file_new->data; |
Jeej | 3:1bc9159847ab | 26 | (*file)->next = file_new->next; |
Jeej | 3:1bc9159847ab | 27 | FREE(file_new); |
Jeej | 3:1bc9159847ab | 28 | return; |
Jeej | 3:1bc9159847ab | 29 | } |
Jeej | 3:1bc9159847ab | 30 | |
Jeej | 3:1bc9159847ab | 31 | ram_fs_update((ram_fs_file_t**)&((*file)->next), file_new); |
Jeej | 0:befc17558de9 | 32 | } |
Jeej | 0:befc17558de9 | 33 | |
Jeej | 0:befc17558de9 | 34 | static ram_fs_file_t* ram_fs_get(ram_fs_file_t* file, uint8_t fid) |
Jeej | 0:befc17558de9 | 35 | { |
Jeej | 0:befc17558de9 | 36 | if (file == NULL) |
Jeej | 0:befc17558de9 | 37 | { |
Jeej | 0:befc17558de9 | 38 | return NULL; |
Jeej | 0:befc17558de9 | 39 | } |
Jeej | 0:befc17558de9 | 40 | |
Jeej | 0:befc17558de9 | 41 | if (file->file_id == fid) |
Jeej | 0:befc17558de9 | 42 | { |
Jeej | 0:befc17558de9 | 43 | return file; |
Jeej | 0:befc17558de9 | 44 | } |
Jeej | 0:befc17558de9 | 45 | |
Jeej | 0:befc17558de9 | 46 | return ram_fs_get((ram_fs_file_t*)file->next, fid); |
Jeej | 0:befc17558de9 | 47 | } |
Jeej | 0:befc17558de9 | 48 | |
Jeej | 0:befc17558de9 | 49 | static bool ram_fs_remove(ram_fs_file_t** file, uint8_t fid) |
Jeej | 0:befc17558de9 | 50 | { |
Jeej | 0:befc17558de9 | 51 | if (*file == NULL) |
Jeej | 0:befc17558de9 | 52 | { |
Jeej | 0:befc17558de9 | 53 | // File does nor exist |
Jeej | 0:befc17558de9 | 54 | return true; |
Jeej | 0:befc17558de9 | 55 | } |
Jeej | 0:befc17558de9 | 56 | |
Jeej | 0:befc17558de9 | 57 | if ((*file)->file_id == fid) |
Jeej | 0:befc17558de9 | 58 | { |
Jeej | 0:befc17558de9 | 59 | ram_fs_file_t* file_old = *file; |
Jeej | 0:befc17558de9 | 60 | *file = (ram_fs_file_t*)file_old->next; |
Jeej | 0:befc17558de9 | 61 | FREE(file_old); |
Jeej | 0:befc17558de9 | 62 | return false; |
Jeej | 0:befc17558de9 | 63 | } |
Jeej | 0:befc17558de9 | 64 | |
Jeej | 0:befc17558de9 | 65 | return ram_fs_remove((ram_fs_file_t**)&((*file)->next), fid); |
Jeej | 0:befc17558de9 | 66 | } |
Jeej | 0:befc17558de9 | 67 | |
Jeej | 0:befc17558de9 | 68 | void ram_fs_new(uint8_t file_id, uint8_t* header, uint8_t* data) |
Jeej | 0:befc17558de9 | 69 | { |
Jeej | 2:91473a2fac1c | 70 | RAM_FS_PRINT("NF(%d)\r\n", file_id); |
Jeej | 1:73a2c1814a34 | 71 | |
Jeej | 0:befc17558de9 | 72 | ram_fs_file_t* file_new = (ram_fs_file_t*)MALLOC(sizeof(ram_fs_file_t)); |
Jeej | 0:befc17558de9 | 73 | |
Jeej | 0:befc17558de9 | 74 | file_new->file_id = file_id; |
Jeej | 0:befc17558de9 | 75 | file_new->header = header; |
Jeej | 0:befc17558de9 | 76 | file_new->data = data; |
Jeej | 0:befc17558de9 | 77 | file_new->next = NULL; |
Jeej | 0:befc17558de9 | 78 | |
Jeej | 3:1bc9159847ab | 79 | ram_fs_update(&g_fs, file_new); |
Jeej | 0:befc17558de9 | 80 | } |
Jeej | 0:befc17558de9 | 81 | |
Jeej | 0:befc17558de9 | 82 | bool ram_fs_delete(uint8_t file_id) |
Jeej | 0:befc17558de9 | 83 | { |
Jeej | 2:91473a2fac1c | 84 | RAM_FS_PRINT("DF(%d)\r\n", file_id); |
Jeej | 0:befc17558de9 | 85 | return ram_fs_remove(&g_fs, file_id); |
Jeej | 0:befc17558de9 | 86 | } |
Jeej | 0:befc17558de9 | 87 | |
Jeej | 0:befc17558de9 | 88 | bool ram_fs_write(uint8_t file_id, uint16_t offset, uint16_t size, uint8_t* content) |
Jeej | 0:befc17558de9 | 89 | { |
Jeej | 0:befc17558de9 | 90 | ram_fs_file_t* file; |
Jeej | 0:befc17558de9 | 91 | |
Jeej | 2:91473a2fac1c | 92 | RAM_FS_PRINT("WF(%d)\r\n", file_id); |
Jeej | 0:befc17558de9 | 93 | |
Jeej | 0:befc17558de9 | 94 | // Retrieve pointer to file |
Jeej | 0:befc17558de9 | 95 | file = ram_fs_get(g_fs, file_id); |
Jeej | 0:befc17558de9 | 96 | |
Jeej | 0:befc17558de9 | 97 | if (file == NULL) |
Jeej | 0:befc17558de9 | 98 | { |
Jeej | 0:befc17558de9 | 99 | return true; |
Jeej | 0:befc17558de9 | 100 | } |
Jeej | 0:befc17558de9 | 101 | |
Jeej | 0:befc17558de9 | 102 | // Write the new data |
Jeej | 0:befc17558de9 | 103 | memcpy((void*)(file->data+offset), (void*)content, size); |
Jeej | 0:befc17558de9 | 104 | |
Jeej | 0:befc17558de9 | 105 | return false; |
Jeej | 0:befc17558de9 | 106 | } |
Jeej | 0:befc17558de9 | 107 | |
Jeej | 0:befc17558de9 | 108 | bool ram_fs_read(uint8_t file_id, uint16_t offset, uint16_t size, uint8_t* buf) |
Jeej | 0:befc17558de9 | 109 | { |
Jeej | 0:befc17558de9 | 110 | ram_fs_file_t* file; |
Jeej | 0:befc17558de9 | 111 | |
Jeej | 2:91473a2fac1c | 112 | RAM_FS_PRINT("RF(%d)\r\n", file_id); |
Jeej | 0:befc17558de9 | 113 | |
Jeej | 0:befc17558de9 | 114 | // Retrieve pointer to file |
Jeej | 0:befc17558de9 | 115 | file = ram_fs_get(g_fs, file_id); |
Jeej | 0:befc17558de9 | 116 | |
Jeej | 0:befc17558de9 | 117 | if (file == NULL) |
Jeej | 0:befc17558de9 | 118 | { |
Jeej | 0:befc17558de9 | 119 | return true; |
Jeej | 0:befc17558de9 | 120 | } |
Jeej | 0:befc17558de9 | 121 | |
Jeej | 0:befc17558de9 | 122 | // Read data |
Jeej | 0:befc17558de9 | 123 | memcpy((void*)buf, (void*)(file->data+offset), size); |
Jeej | 0:befc17558de9 | 124 | |
Jeej | 0:befc17558de9 | 125 | return false; |
Jeej | 0:befc17558de9 | 126 | } |
Jeej | 0:befc17558de9 | 127 | |
Jeej | 0:befc17558de9 | 128 | void* ram_fs_get_header(uint8_t file_id) |
Jeej | 0:befc17558de9 | 129 | { |
Jeej | 0:befc17558de9 | 130 | ram_fs_file_t* file; |
Jeej | 0:befc17558de9 | 131 | |
Jeej | 2:91473a2fac1c | 132 | RAM_FS_PRINT("RH(%d)\r\n", file_id); |
Jeej | 0:befc17558de9 | 133 | |
Jeej | 0:befc17558de9 | 134 | // Retrieve pointer to file |
Jeej | 0:befc17558de9 | 135 | file = ram_fs_get(g_fs, file_id); |
Jeej | 0:befc17558de9 | 136 | |
Jeej | 1:73a2c1814a34 | 137 | //ASSERT(file != NULL, "File %d does not exist!\r\n", file_id); |
Jeej | 0:befc17558de9 | 138 | |
Jeej | 1:73a2c1814a34 | 139 | if (file == NULL) |
Jeej | 1:73a2c1814a34 | 140 | { |
Jeej | 1:73a2c1814a34 | 141 | return NULL; |
Jeej | 1:73a2c1814a34 | 142 | } |
Jeej | 1:73a2c1814a34 | 143 | else |
Jeej | 1:73a2c1814a34 | 144 | { |
Jeej | 1:73a2c1814a34 | 145 | // Return header pointer |
Jeej | 1:73a2c1814a34 | 146 | return file->header; |
Jeej | 1:73a2c1814a34 | 147 | } |
Jeej | 0:befc17558de9 | 148 | } |