102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <errno.h>
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#include "umka.h"
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#include "trace.h"
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#include "vdisk.h"
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typedef struct {
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FILE *file;
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uint32_t sect_size;
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uint64_t sect_cnt;
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unsigned cache_size;
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int adjust_cache_size;
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} vdisk_t;
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void *vdisk_init(const char *fname, int adjust_cache_size, size_t cache_size) {
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FILE *f = fopen(fname, "r+");
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if (!f) {
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printf("vdisk: can't open file '%s': %s\n", fname, strerror(errno));
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return NULL;
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}
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fseeko(f, 0, SEEK_END);
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off_t fsize = ftello(f);
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fseeko(f, 0, SEEK_SET);
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size_t sect_size = 512;
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if (strstr(fname, "s4096") != NULL || strstr(fname, "s4k") != NULL) {
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sect_size = 4096;
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}
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vdisk_t *vdisk = (vdisk_t*)malloc(sizeof(vdisk_t));
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*vdisk = (vdisk_t){.file = f,
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.sect_size = sect_size,
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.sect_cnt = (uint64_t)fsize / sect_size,
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.cache_size = cache_size,
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.adjust_cache_size = adjust_cache_size};
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return vdisk;
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}
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__attribute__((__stdcall__))
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void vdisk_close(void *userdata) {
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COVERAGE_OFF();
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vdisk_t *vdisk = userdata;
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fclose(vdisk->file);
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free(vdisk);
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COVERAGE_ON();
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}
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__attribute__((__stdcall__))
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int vdisk_read(void *userdata, void *buffer, off_t startsector,
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size_t *numsectors) {
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COVERAGE_OFF();
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vdisk_t *vdisk = userdata;
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fseeko(vdisk->file, startsector * vdisk->sect_size, SEEK_SET);
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fread(buffer, *numsectors * vdisk->sect_size, 1, vdisk->file);
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COVERAGE_ON();
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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int vdisk_write(void *userdata, void *buffer, off_t startsector,
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size_t *numsectors) {
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COVERAGE_OFF();
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vdisk_t *vdisk = userdata;
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fseeko(vdisk->file, startsector * vdisk->sect_size, SEEK_SET);
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fwrite(buffer, *numsectors * vdisk->sect_size, 1, vdisk->file);
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COVERAGE_ON();
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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int vdisk_querymedia(void *userdata, diskmediainfo_t *minfo) {
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COVERAGE_OFF();
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vdisk_t *vdisk = userdata;
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minfo->flags = 0u;
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minfo->sector_size = vdisk->sect_size;
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minfo->capacity = vdisk->sect_cnt;
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COVERAGE_ON();
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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size_t vdisk_adjust_cache_size(void *userdata, size_t suggested_size) {
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vdisk_t *vdisk = userdata;
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if (vdisk->adjust_cache_size) {
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return vdisk->cache_size;
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} else {
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return suggested_size;
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}
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}
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diskfunc_t vdisk_functions = {
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.strucsize = sizeof(diskfunc_t),
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.close = vdisk_close,
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.closemedia = NULL,
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.querymedia = vdisk_querymedia,
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.read = vdisk_read,
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.write = vdisk_write,
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.flush = NULL,
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.adjust_cache_size = vdisk_adjust_cache_size,
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};
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