mirror of
https://github.com/libretro/beetle-pce-fast-libretro.git
synced 2024-11-27 10:00:24 +00:00
153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
/* Mednafen - Multi-system Emulator
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include "file.h"
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#include "mednafen-endian.h"
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struct MDFNFILE *file_open(const char *path)
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{
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const char *ld;
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FILE *fp;
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struct MDFNFILE *file = (struct MDFNFILE*)calloc(1, sizeof(*file));
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if (!file)
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return NULL;
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fp = fopen(path, "rb");
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if (!fp)
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goto error;
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fseek(fp, 0, SEEK_SET);
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fseek((FILE *)fp, 0, SEEK_END);
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file->size = ftell((FILE *)fp);
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fseek((FILE *)fp, 0, SEEK_SET);
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if (!(file->data = (uint8_t*)malloc(file->size)))
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goto error;
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fread(file->data, 1, file->size, (FILE *)fp);
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ld = (const char*)strrchr(path, '.');
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file->ext = strdup(ld ? ld + 1 : "");
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return file;
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error:
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if (fp)
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fclose((FILE*)fp);
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if (file)
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free(file);
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return NULL;
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}
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int file_close(struct MDFNFILE *file)
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{
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if (!file)
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return 0;
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if (file->ext)
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free(file->ext);
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file->ext = NULL;
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if (file->data)
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free(file->data);
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file->data = NULL;
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free(file);
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return 1;
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}
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uint64_t file_read(struct MDFNFILE *file, void *ptr,
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size_t element_size, size_t nmemb)
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{
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uint32_t total = element_size * nmemb;
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if (file->location >= file->size)
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return 0;
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if ((file->location + total) > file->size)
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{
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int64_t ak = file->size - file->location;
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memcpy((uint8_t*)ptr, file->data + file->location, ak);
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file->location = file->size;
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return(ak / element_size);
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}
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memcpy((uint8_t*)ptr, file->data + file->location, total);
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file->location += total;
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return nmemb;
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}
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int file_seek(struct MDFNFILE *file, int64_t offset, int whence)
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{
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switch(whence)
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{
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case SEEK_SET:
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if (offset >= file->size)
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return -1;
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file->location = offset;
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break;
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case SEEK_CUR:
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if ((offset + file->location) > file->size)
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return -1;
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file->location += offset;
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break;
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}
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return 0;
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}
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char *file_fgets(struct MDFNFILE *file, char *s, int len)
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{
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int pos = 0;
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if (!len)
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return(NULL);
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if (file->location >= len)
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return(NULL);
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while(pos < (len - 1) && file->location < len)
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{
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int v = file->data[file->location];
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s[pos] = v;
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file->location++;
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pos++;
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if (v == '\n')
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break;
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}
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if (len)
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s[pos] = 0;
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return s;
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}
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