PSP PBP File Input/Output API v0.1 - pbpio.c

#include <pspkernel.h>
#include <stdlib.h>
#include "pbpio.h"

typedef struct {
        char magicNumber[4];
        int version;
        int offsets[8];
} PBPHeader;

PbpIoFile *pbpIoOpen(const char *file, PbpIoSlot slot, int flags, SceMode mode)
{
    PbpIoFile *fd = malloc(sizeof(PbpIoFile));
    fd->fd = sceIoOpen(file, flags, mode);
    fd->slot = slot;

    PBPHeader pbpHeader;
    sceIoRead(fd->fd, &pbpHeader, sizeof(pbpHeader));
    char correctMagicNumber[4] = { '\0', 'P', 'B', 'P' };
    int correctVersion = 0x010000;
    if(pbpHeader.magicNumber != correctMagicNumber) return NULL;
    if(pbpHeader.version != correctVersion) return NULL;
    sceIoLseek(fd->fd, pbpHeader.offsets[slot], SEEK_SET);

    fd->slotOffset = pbpHeader.offsets[slot];

    return fd;
}

int pbpIoClose(PbpIoFile *fd)
{
    int r = sceIoClose(fd->fd);
    free(fd);
    return r;
}

SceOff pbpIoLseek(PbpIoFile *fd, SceOff offset, int whence)
{
    return sceIoLseek(fd->fd, fd->slotOffst+offset, whence);
}

int pbpIoRead(PbpIoFile *fd, void *data, SceSize size)
{
    return sceIoRead(fd->fd, data, size);
}
int pbpIoWrite(PbpIoFile *fd, const void *data, SceSize size)
{
    return sceIoWrite(fd->fd, data, size);
}