mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-13 23:15:09 +01:00
314 lines
7.4 KiB
C
314 lines
7.4 KiB
C
#include <ogcsys.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include "splits.h"
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#define off64_t off_t
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#define FMT_llu "%llu"
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#define FMT_lld "%lld"
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#define split_error(x) do { /* gprintf("\nsplit error: %s\n\n",x); */ } while(0)
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// 1 sector less than 4gb
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u64 OPT_split_size = (u64)4LL * 1024 * 1024 * 1024 - (32 * 1024);
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// 1 sector less than 2gb
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// u64 OPT_split_size = (u64)2LL * 1024 * 1024 * 1024 - 512;
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//split_info_t split;
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void split_get_fname(split_info_t *s, int idx, char *fname)
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{
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strcpy(fname, s->fname);
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if (idx == 0 && s->create_mode) {
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strcat(fname, ".tmp");
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} else if (idx > 0) {
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char *c = fname + strlen(fname) - 1;
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*c = '0' + idx;
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}
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}
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int split_open_file(split_info_t *s, int idx)
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{
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int fd = s->fd[idx];
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if (fd>=0) return fd;
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char fname[1024];
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split_get_fname(s, idx, fname);
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//char *mode = s->create_mode ? "wb+" : "rb+";
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int mode = s->create_mode ? (O_CREAT | O_RDWR) : O_RDWR ;
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//printf("SPLIT OPEN %s %s %d\n", fname, mode, idx); //Wpad_WaitButtons();
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//f = fopen(fname, mode);
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fd = open(fname, mode);
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if (fd<0) return -1;
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if (idx > 0 && s->create_mode) {
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printf("%s Split: %d %s \n",
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s->create_mode ? "Create" : "Read",
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idx, fname);
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}
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s->fd[idx] = fd;
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return fd;
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}
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// faster as it uses larger chunks than ftruncate internally
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int write_zero(int fd, off_t size)
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{
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int buf[0x4000]; //64kb
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int chunk;
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int ret;
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memset(buf, 0, sizeof(buf));
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while (size) {
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chunk = size;
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if (chunk > sizeof(buf)) chunk = sizeof(buf);
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ret = write(fd, buf, chunk);
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//printf("WZ %d %d / %lld \n", ret, chunk, size);
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size -= chunk;
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if (ret < 0) return ret;
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}
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return 0;
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}
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int split_fill(split_info_t *s, int idx, u64 size)
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{
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int fd = split_open_file(s, idx);
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off64_t fsize = lseek(fd, 0, SEEK_END);
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if (fsize < size) {
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//printf("TRUNC %d "FMT_lld"\n", idx, size); Wpad_WaitButtons();
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//ftruncate(fd, size);
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write_zero(fd, size - fsize);
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return 1;
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}
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return 0;
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}
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int split_get_file(split_info_t *s, u32 lba, u32 *sec_count, int fill)
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{
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int fd;
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if (lba >= s->total_sec) {
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fprintf(stderr, "SPLIT: invalid sector %u / %u\n", lba, (u32)s->total_sec);
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return -1;
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}
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int idx;
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idx = lba / s->split_sec;
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if (idx >= s->max_split) {
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fprintf(stderr, "SPLIT: invalid split %d / %d\n", idx, s->max_split - 1);
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return -1;
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}
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fd = s->fd[idx];
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if (fd<0) {
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// opening new, make sure all previous are full
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int i;
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for (i=0; i<idx; i++) {
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if (split_fill(s, i, s->split_size)) {
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printf("FILL %d\n", i);
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}
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}
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fd = split_open_file(s, idx);
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}
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if (fd<0) {
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fprintf(stderr, "SPLIT %d: no file\n", idx);
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return -1;
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}
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u32 sec = lba % s->split_sec; // inside file
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off64_t off = (off64_t)sec * 512;
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// num sectors till end of file
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u32 to_end = s->split_sec - sec;
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if (*sec_count > to_end) *sec_count = to_end;
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if (s->create_mode) {
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if (fill) {
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// extend, so that read will be succesfull
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split_fill(s, idx, off + 512 * (*sec_count));
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} else {
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// fill up so that write continues from end of file
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// shouldn't be necessary, but libfat looks buggy
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// and this is faster
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split_fill(s, idx, off);
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}
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}
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lseek(fd, off, SEEK_SET);
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return fd;
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}
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int split_read_sector(void *_fp,u32 lba,u32 count,void*buf)
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{
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split_info_t *s = _fp;
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int fd;
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u64 off = lba;
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off *= 512ULL;
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int i;
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u32 chunk;
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size_t ret;
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//fprintf(stderr,"READ %d %d\n", lba, count);
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for (i=0; i<(int)count; i+=chunk) {
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chunk = count - i;
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fd = split_get_file(s, lba+i, &chunk, 1);
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if (fd<0) {
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fprintf(stderr,"\n\n"FMT_lld" %d %p\n",off,count,_fp);
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split_error("error seeking in disc partition");
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return 1;
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}
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//ret = fread(buf+i*512, 512ULL, chunk, f);
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ret = read(fd, buf+i*512, chunk * 512);
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if (ret != chunk * 512) {
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fprintf(stderr, "error reading %u %u [%u] %u = %u\n",
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lba, count, i, chunk, ret);
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split_error("error reading disc");
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return 1;
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}
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}
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return 0;
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}
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int split_write_sector(void *_fp,u32 lba,u32 count,void*buf)
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{
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split_info_t *s = _fp;
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int fd;
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u64 off = lba;
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off*=512ULL;
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int i;
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u32 chunk;
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size_t ret;
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//printf("WRITE %d %d %p \n", lba, count, buf);
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for (i=0; i<(int)count; i+=chunk) {
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chunk = count - i;
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fd = split_get_file(s, lba+i, &chunk, 0);
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//if (chunk != count)
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// fprintf(stderr, "WRITE CHUNK %d %d/%d\n", lba+i, chunk, count);
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if (fd<0 || !chunk) {
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fprintf(stderr,"\n\n"FMT_lld" %d %p\n",off,count,_fp);
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split_error("error seeking in disc partition");
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return 1;
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}
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//if (fwrite(buf+i*512, 512ULL, chunk, f) != chunk) {
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//printf("write %d %p %d \n", fd, buf+i*512, chunk * 512);
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ret = write(fd, buf+i*512, chunk * 512);
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//printf("write ret = %d \n", ret);
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if (ret != chunk * 512) {
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split_error("error writing disc");
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return 1;
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}
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}
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return 0;
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}
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void split_init(split_info_t *s, char *fname)
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{
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int i;
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char *p;
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//fprintf(stderr, "SPLIT_INIT %s\n", fname);
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memset(s, 0, sizeof(*s));
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for (i=0; i<MAX_SPLIT; i++) {
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s->fd[i] = -1;
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}
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strcpy(s->fname, fname);
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s->max_split = 1;
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p = strrchr(fname, '.');
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if (p && (strcasecmp(p, ".wbfs") == 0)) {
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s->max_split = MAX_SPLIT;
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}
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}
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void split_set_size(split_info_t *s, u64 split_size, u64 total_size)
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{
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s->total_size = total_size;
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s->split_size = split_size;
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s->total_sec = total_size / 512;
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s->split_sec = split_size / 512;
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}
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void split_close(split_info_t *s)
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{
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int i;
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char fname[1024];
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char tmpname[1024];
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for (i=0; i<s->max_split; i++) {
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if (s->fd[i] >= 0) {
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close(s->fd[i]);
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}
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}
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if (s->create_mode) {
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split_get_fname(s, -1, fname);
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split_get_fname(s, 0, tmpname);
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rename(tmpname, fname);
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}
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memset(s, 0, sizeof(*s));
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}
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int split_create(split_info_t *s, char *fname,
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u64 split_size, u64 total_size, bool overwrite)
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{
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int i;
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int fd;
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char sname[1024];
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int error = 0;
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split_init(s, fname);
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s->create_mode = 1;
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// check if any file already exists
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for (i=-1; i<s->max_split; i++) {
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split_get_fname(s, i, sname);
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if (overwrite) {
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remove(sname);
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} else {
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fd = open(sname, O_RDONLY);
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if (fd >= 0) {
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fprintf(stderr, "Error: file already exists: %s\n", sname);
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close(fd);
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error = 1;
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}
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}
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}
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if (error) {
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split_init(s, "");
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return -1;
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}
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split_set_size(s, split_size, total_size);
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return 0;
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}
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int split_open(split_info_t *s, char *fname)
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{
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int i;
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u64 size = 0;
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u64 total_size = 0;
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u64 split_size = 0;
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int fd;
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split_init(s, fname);
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for (i=0; i<s->max_split; i++) {
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fd = split_open_file(s, i);
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if (fd<0) {
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if (i==0) goto err;
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break;
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}
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// check previous size - all splits except last must be same size
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if (i > 0 && size != split_size) {
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fprintf(stderr, "split %d: invalid size "FMT_lld"", i, size);
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goto err;
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}
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// get size
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//fseeko(f, 0, SEEK_END);
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//size = ftello(f);
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size = lseek(fd, 0, SEEK_END);
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// check sector alignment
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if (size % 512) {
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fprintf(stderr, "split %d: size ("FMT_lld") not sector (512) aligned!",
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i, size);
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}
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// first sets split size
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if (i==0) {
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split_size = size;
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}
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total_size += size;
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}
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split_set_size(s, split_size, total_size);
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return 0;
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err:
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split_close(s);
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return -1;
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}
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