mirror of
https://github.com/nitraiolo/CfgUSBLoader.git
synced 2024-10-22 14:15:05 +02:00
268 lines
7.2 KiB
C
268 lines
7.2 KiB
C
/*
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* DIP plugin for Custom IOS (FRAG mode)
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*
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* Copyright (C) 2010 Waninkoko, WiiGator, oggzee.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// frag list by oggzee
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#include <string.h>
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//#include "dip_calls.h"
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#include "syscalls.h"
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#include "usbstorage.h"
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#include "sdhc.h"
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#include "frag.h"
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#define DEV_NONE 0
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#define DEV_USB 1
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#define DEV_SDHC 2
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#define MAX_IDX 640 // 640*16MB = 10GB
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#define IDX_CHUNK 32768 // 16MB in sectors units: 16*1024*1024/512
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#define IDX_SHIFT 15 // 1<<15 = 32768
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static u16 frag_idx[MAX_IDX] = { 0 };
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static u32 frag_init = 0;
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static u32 frag_dev = 0;
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//static FragList fraglist_data = { 0 };
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static FragList *frag_list = 0;
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static u8 sector_buf[512] __attribute__ ((aligned (32)));
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void optimize_frag_list(void);
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// NOTE: all local variables are declared static
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// because stack size is rather limited
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// NOTE2: hmm, memcpy and char array writing seems
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// to only work if length is word aligned... cache issue?
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s32 Frag_Init(u32 device, void *fraglist, int size)
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{
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static int ret;
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if (frag_init) Frag_Close();
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if (!device || device > 2) return -1;
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if (!size) return -1;
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if (size > sizeof(FragList)) return -2;
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if (device == DEV_USB) {
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ret = usbstorage_Init();
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} else {
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ret = sdhc_Init();
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}
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if (ret) return ret;
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frag_dev = device;
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//frag_list = &fraglist_data;
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// frag list is incompatible with fatffs
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// because both need a large-ish chunk of mem
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// so we will use the same adress as fatffs
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frag_list = (void*)0x13730000;
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os_sync_before_read(fraglist, size);
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memset(frag_list, 0, sizeof(FragList));
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memcpy(frag_list, fraglist, size);
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os_sync_after_write(fraglist, size);
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optimize_frag_list();
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frag_init = 1;
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return size;
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}
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void Frag_Close(void)
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{
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frag_init = 0;
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frag_list = 0;
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frag_dev = 0;
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}
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void optimize_frag_list(void)
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{
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int i;
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u32 off;
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u16 idx = 0;
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for (i=0; i<MAX_IDX; i++) {
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off = i << IDX_SHIFT;
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while ((off >= frag_list->frag[idx].offset + frag_list->frag[idx].count)
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&& (idx + 1 < frag_list->num))
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{
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idx++;
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}
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frag_idx[i] = idx;
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}
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}
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// in case a sparse block is requested,
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// the returned poffset might not be equal to requested offset
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// the difference should be filled with 0
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int frag_get(FragList *ff, u32 offset, u32 count,
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u32 *poffset, u32 *psector, u32 *pcount)
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{
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static int i;
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static u32 delta;
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static u32 idx_off;
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static u32 start_idx;
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// optimize seek inside frag list
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// jump to a precalculated index
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idx_off = offset >> IDX_SHIFT;
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if (idx_off > MAX_IDX) idx_off = MAX_IDX - 1;
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start_idx = frag_idx[idx_off];
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//printf("frag_get(%u %u)\n", offset, count);
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for (i=start_idx; i<ff->num; i++) {
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if (ff->frag[i].offset <= offset
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&& ff->frag[i].offset + ff->frag[i].count > offset)
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{
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delta = offset - ff->frag[i].offset;
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*poffset = offset;
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*psector = ff->frag[i].sector + delta;
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*pcount = ff->frag[i].count - delta;
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if (*pcount > count) *pcount = count;
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goto out;
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}
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if (ff->frag[i].offset > offset
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&& ff->frag[i].offset < offset + count)
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{
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delta = ff->frag[i].offset - offset;
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*poffset = ff->frag[i].offset;
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*psector = ff->frag[i].sector;
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*pcount = ff->frag[i].count;
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count -= delta;
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if (*pcount > count) *pcount = count;
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goto out;
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}
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}
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// not found
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if (offset + count > ff->size) {
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// error: out of range!
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return -2;
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}
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// if inside range, then it must be just sparse, zero filled
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// return empty block at the end of requested
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*poffset = offset + count;
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*psector = 0;
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*pcount = 0;
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out:
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//printf("=>(%u %u %u)\n", *poffset, *psector, *pcount);
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return 0;
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}
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// offset and len in sectors
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int frag_read_sect(u32 offset, u8 *data, u32 len)
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{
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static u32 off_ret;
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static u32 sector;
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static u32 count;
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static u32 delta;
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static int ret;
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while (len) {
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//int frag_get(FragList *ff, u32 offset, u32 count,
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// u32 *poffset, u32 *psector, u32 *pcount)
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ret = frag_get(frag_list, offset, len,
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&off_ret, §or, &count);
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if (ret) return ret; // err
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delta = off_ret - offset;
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if (delta) {
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// sparse block, fill with 0
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memset(data, 0, delta << 9);
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offset += delta;
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data += delta << 9;
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len -= delta;
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}
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if (count) {
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//int read_sector(void *ign, u32 lba, u32 count, void*buf)
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//ret = read_sector(0, sector, count, data);
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//if (ret) return ret;
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//bool usbstorage_ReadSectors(u32 sector, u32 numSectors, void *buffer)
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//ret = usbstorage_ReadSectors(sector, count, data);
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if (frag_dev == DEV_USB) {
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ret = __usbstorage_Read(sector, count, data);
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} else {
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ret = sdhc_Read(sector, count, data);
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}
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if (!ret) return -3;
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offset += count;
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data += count << 9;
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len -= count;
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}
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if (delta + count == 0) {
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// (should never happen)
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return -4;
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}
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}
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return 0;
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}
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// offset is pointing 32bit words to address the whole dvd, len is in bytes
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int frag_read_partial(u32 offset, u8 *data, u32 len, u32 *read_len)
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{
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static int ret;
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static u32 off_sec;
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static u32 mod;
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static u32 rlen;
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off_sec = offset >> 7; // word to sect
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mod = (offset & ((512-1) >> 2)) << 2; // offset from start of sector in bytes
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rlen = 512 - mod; // remaining len from mod to end of sector
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if (rlen > len) rlen = len;
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if (rlen == 512) rlen = 0; // don't read whole sectors
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if (rlen) {
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ret = frag_read_sect(off_sec, sector_buf, 1);
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if (ret) return ret;
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memcpy(data, sector_buf + mod, rlen);
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}
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*read_len = rlen;
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return 0;
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}
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// woffset is pointing 32bit words to address the whole dvd, len is in bytes
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s32 Frag_Read(void *data, u32 len, u32 woffset)
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{
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static int ret;
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static u32 rlen;
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static u32 off_sec;
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static u32 len_sec;
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// read leading partial non sector aligned data
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ret = frag_read_partial(woffset, data, len, &rlen);
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if (ret) return ret;
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woffset += rlen >> 2;
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data = (u8*)data + rlen;
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len -= rlen;
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if (len >= 512) {
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// read sector aligned data
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off_sec = woffset >> 7; // word to sect
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len_sec = len >> 9; // byte to sect
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ret = frag_read_sect(off_sec, data, len_sec);
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if (ret) return ret;
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woffset += len_sec << 7;
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data = (u8*)data + (len_sec << 9);
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len -= len_sec << 9;
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}
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if (len) {
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// read trailing partial non sector aligned data
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ret = frag_read_partial(woffset, data, len, &rlen);
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if (ret) return ret;
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len -= rlen;
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}
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if (len) return -5; // should never happen
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// success
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return 0;
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}
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