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#include <stdlib.h>
#include <memory.h>
#include "mpq-bios.h"
#include "mpq-file.h"
#include "mpq-errors.h"
#include "int-bios.h"
#include "errors.h"
struct mpq_file_t {
struct mpq_archive_t * mpq_a;
int entry;
int number_of_sectors;
int remaining_bytes;
int current_sector;
uint32_t cursor;
uint64_t offset;
uint32_t file_size;
uint32_t sector_size;
char * buffer;
uint64_t * offsets;
};
struct mpq_file_t * mpqlib_open_file(struct mpq_archive_t * mpq_a, int entry) {
struct mpq_file_t * r;
int i;
if (mpqlib_ioctl(mpq_a, MPQLIB_IOCTL_ENTRY_EXISTS, entry)) {
return NULL;
}
if (!(r = (struct mpq_file_t *) malloc(sizeof(struct mpq_file_t)))) {
__mpqlib_errno = MPQLIB_ERROR_MEMORY;
return NULL;
}
r->sector_size = mpqlib_ioctl(mpq_a, MPQLIB_IOCTL_GET_SECTOR_SIZE, 0);
if (!(r->buffer = malloc(r->sector_size))) {
free(r);
__mpqlib_errno = MPQLIB_ERROR_MEMORY;
return NULL;
}
r->entry = entry;
r->file_size = mpqlib_ioctl(mpq_a, MPQLIB_IOCTL_GET_FILE_SIZE, entry);
r->offset = mpqlib_ioctl(mpq_a, MPQLIB_IOCTL_GET_BLOCK_OFFSET, entry);
r->number_of_sectors = r->file_size / r->sector_size;
if ((r->remaining_bytes = (r->file_size % r->sector_size))) {
r->number_of_sectors++;
}
r->current_sector = -1;
r->cursor = 0;
if (!(r->offsets = (uint64_t *) malloc(r->number_of_sectors * sizeof(uint64_t)))) {
free(r->buffer);
free(r);
__mpqlib_errno = MPQLIB_ERROR_MEMORY;
return NULL;
}
__mpqlib_seek(mpq_a, r->offset);
for (i = 0; i < r->number_of_sectors; i++) {
uint32_t o;
__mpqlib_read(mpq_a, &o, 4);
r->offsets[i] = r->offset + o;
}
return r;
}
struct mpq_file_t * mpqlib_open_filename(struct mpq_archive_t * mpq_a, const char * fname) {
int e;
if ((e = mpqlib_find_hash_entry_by_name(mpq_a, fname, 0, 0)) < 0)
return NULL;
return mpqlib_open_file(mpq_a, e);
}
void mpqlib_close_file(struct mpq_file_t * mpq_f) {
free(mpq_f->buffer);
free(mpq_f->offsets);
free(mpq_f);
}
static void cache_sector(struct mpq_file_t * mpq_f, int sector) {
if (mpq_f->current_sector != sector) {
__mpqlib_seek(mpq_f->mpq_a, mpq_f->offsets[sector]);
__mpqlib_read(mpq_f->mpq_a, mpq_f->buffer, mpq_f->sector_size);
mpq_f->current_sector = sector;
}
}
uint32_t mpqlib_read(struct mpq_file_t * mpq_f, void * buffer, uint32_t size) {
int sector_begin, sector_end;
uint32_t offset_begin, offset_end;
uint32_t first_sector_begins, last_sector_ends;
if ((size + mpq_f->cursor) >= mpq_f->file_size)
size = mpq_f->file_size - mpq_f->cursor;
offset_begin = mpq_f->cursor;
sector_begin = offset_begin / mpq_f->sector_size;
first_sector_begins = offset_begin % mpq_f->sector_size;
offset_end = size + mpq_f->cursor;
sector_end = offset_end / mpq_f->sector_size;
last_sector_ends = offset_end % mpq_f->sector_size;
if (!(offset_end % mpq_f->sector_size)) {
sector_end--;
last_sector_ends = mpq_f->sector_size;
}
if (sector_begin == sector_end) {
cache_sector(mpq_f, sector_begin);
memcpy(buffer, mpq_f->buffer + first_sector_begins, size);
return size;
}
/* ... */
return size;
}
uint32_t mpqlib_seek(struct mpq_file_t * mpq_f, int32_t offset, enum mpqlib_file_seek_t wheel) {
switch (wheel) {
case MPQLIB_SEEK_SET:
if (offset < 0)
offset = 0;
mpq_f->cursor = offset;
break;
case MPQLIB_SEEK_CUR:
if ((-offset) >= mpq_f->cursor)
offset = -mpq_f->cursor;
mpq_f->cursor += offset;
break;
case MPQLIB_SEEK_END:
if (offset > 0)
offset = 0;
if ((-offset) >= mpq_f->file_size)
offset = -mpq_f->file_size;
mpq_f->cursor += offset;
break;
default:
__mpqlib_errno = MPQLIB_ERROR_UNKNOWN;
return 0xffffffff;
}
if (mpq_f->cursor >= mpq_f->file_size)
mpq_f->cursor = mpq_f->file_size;
return mpq_f->cursor;
}
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