usbloadergx/source/usbloader/partition.c

#include <stdio.h>
#include <string.h>
#include <ogcsys.h>

#include "partition.h"
#include "usbstorage.h"
#include "utils.h"

/* 'partition table' structure */
typedef struct {
    /* Zero bytes */
    u8 padding[446];

    /* Partition table entries */
    partitionEntry entries[MAX_PARTITIONS];
} ATTRIBUTE_PACKED partitionTable;


s32 Partition_GetEntries(partitionEntry *outbuf, u32 *outval) {
    static partitionTable table ATTRIBUTE_ALIGN(32);

    u32 cnt, sector_size;
    s32 ret;

    /* Get sector size */
    ret = USBStorage_GetCapacity(&sector_size);
    if (ret < 0)
        return ret;

    /* Read partition table */
    ret = USBStorage_ReadSectors(0, 1, &table);
    if (ret < 0)
        return ret;

    /* Swap endianess */
    for (cnt = 0; cnt < 4; cnt++) {
        partitionEntry *entry = &table.entries[cnt];

        entry->sector = swap32(entry->sector);
        entry->size   = swap32(entry->size);
    }

    /* Set partition entries */
    memcpy(outbuf, table.entries, sizeof(table.entries));

    /* Set sector size */
    *outval = sector_size;

    return 0;
}