CE add format command, implement libfat

libfat/libfat.c

@@ -1,3 +1,103 @@
+#include <devices.h>
+#include <fs_types.h>
 #include <libfat.h>
+#include <status.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <system.h>
 
-int a;
+static void translate (size_t fs_block, size_t fs_block_count, size_t fs_block_size,
+                       size_t device_sector_size, size_t* out_phys_sector,
+                       size_t* out_sector_count) {
+  size_t ratio = fs_block_size / device_sector_size;
+
+  if (out_phys_sector != NULL)
+    *out_phys_sector = fs_block * ratio;
+
+  if (out_sector_count != NULL)
+    *out_sector_count = fs_block_count * ratio;
+}
+
+static int fat_diskio_read (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
+                            uint32_t sector_count) {
+  (void)ctx;
+
+  int ret;
+  size_t sector_size;
+  size_t phys_sector, phys_sector_count;
+
+  if (sector_count == 0)
+    return 0;
+
+  if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, &sector_size, NULL, NULL, NULL)) <
+      0)
+    return 0;
+
+  translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
+
+  if ((ret = device_do (ctx->device_name, XDRV_READ, &phys_sector, &phys_sector_count, buffer,
+                        NULL)) < 0)
+    return 0;
+
+  return 1;
+}
+
+static int fat_diskio_write (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
+                             uint32_t sector_count) {
+  (void)ctx;
+
+  int ret;
+  size_t sector_size;
+  size_t phys_sector, phys_sector_count;
+
+  if (sector_count == 0)
+    return 0;
+
+  if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, &sector_size, NULL, NULL, NULL)) <
+      0)
+    return 0;
+
+  translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
+
+  if ((ret = device_do (ctx->device_name, XDRV_WRITE, &phys_sector, &phys_sector_count, buffer,
+                        NULL)) < 0)
+    return 0;
+
+  return 1;
+}
+
+int fat_format_drive (struct fatfs_ctx* ctx, const char* device_key, int fs_type) {
+  memset (ctx, 0, sizeof (*ctx));
+  memcpy (ctx->device_name, device_key, sizeof (ctx->device_name) - 1);
+
+  size_t total_size = 0;
+  device_do (device_key, XDRV_GET_SIZE, &total_size, NULL, NULL, NULL);
+
+  if (total_size == 0)
+    return -ST_NOT_FOUND;
+
+  size_t sectors = ((total_size + FAT_SECTOR_SIZE) / FAT_SECTOR_SIZE);
+
+  fl_init (ctx);
+  ctx->_fs.disk_io.read_media = &fat_diskio_read;
+  ctx->_fs.disk_io.write_media = &fat_diskio_write;
+
+  int r = -1;
+
+  switch (fs_type) {
+  case FS_FAT16:
+    r = fatfs_format_fat16 (ctx, &ctx->_fs, sectors, "mop3 fat16");
+    break;
+  case FS_FAT32:
+    r = fatfs_format_fat32 (ctx, &ctx->_fs, sectors, "mop3 fat32");
+    break;
+  default:
+    break;
+  }
+
+  if (r < 0)
+    return -ST_FORMAT_ERROR;
+
+  return ST_OK;
+}