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RetroArch/libretro-common/streams/interface_stream.c
twinaphex edae66e413 Faulty fall-through
2017-12-17 17:12:02 +01:00

484 lines
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/* Copyright (C) 2010-2017 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (interface_stream.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <streams/interface_stream.h>
#include <streams/file_stream.h>
#include <streams/memory_stream.h>
#ifdef HAVE_CHD
#include <streams/chd_stream.h>
#endif
struct intfstream_internal
{
enum intfstream_type type;
struct
{
RFILE *fp;
} file;
struct
{
struct
{
uint8_t *data;
unsigned size;
} buf;
memstream_t *fp;
bool writable;
} memory;
#ifdef HAVE_CHD
struct
{
int32_t track;
chdstream_t *fp;
} chd;
#endif
};
int64_t intfstream_get_size(intfstream_internal_t *intf)
{
if (!intf)
return 0;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_get_size(intf->file.fp);
case INTFSTREAM_MEMORY:
return intf->memory.buf.size;
case INTFSTREAM_CHD:
/* TODO/FIXME - implement this */
break;
}
return 0;
}
bool intfstream_resize(intfstream_internal_t *intf, intfstream_info_t *info)
{
if (!intf || !info)
return false;
switch (intf->type)
{
case INTFSTREAM_FILE:
break;
case INTFSTREAM_MEMORY:
intf->memory.buf.data = info->memory.buf.data;
intf->memory.buf.size = info->memory.buf.size;
memstream_set_buffer(intf->memory.buf.data,
intf->memory.buf.size);
break;
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
#endif
break;
}
return true;
}
bool intfstream_open(intfstream_internal_t *intf, const char *path,
unsigned mode, unsigned hints)
{
if (!intf)
return false;
switch (intf->type)
{
case INTFSTREAM_FILE:
intf->file.fp = filestream_open(path, mode, hints);
if (!intf->file.fp)
return false;
break;
case INTFSTREAM_MEMORY:
intf->memory.fp = memstream_open(intf->memory.writable);
if (!intf->memory.fp)
return false;
break;
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
intf->chd.fp = chdstream_open(path, intf->chd.track);
if (!intf->chd.fp)
return false;
break;
#else
return false;
#endif
}
return true;
}
int intfstream_flush(intfstream_internal_t *intf)
{
if (!intf)
return -1;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_flush(intf->file.fp);
case INTFSTREAM_MEMORY:
case INTFSTREAM_CHD:
/* Should we stub this for these interfaces? */
break;
}
return 0;
}
int intfstream_close(intfstream_internal_t *intf)
{
if (!intf)
return -1;
switch (intf->type)
{
case INTFSTREAM_FILE:
if (intf->file.fp)
return filestream_close(intf->file.fp);
return 0;
case INTFSTREAM_MEMORY:
if (intf->memory.fp)
memstream_close(intf->memory.fp);
return 0;
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
if (intf->chd.fp)
chdstream_close(intf->chd.fp);
#endif
return 0;
}
return -1;
}
void *intfstream_init(intfstream_info_t *info)
{
intfstream_internal_t *intf = NULL;
if (!info)
goto error;
intf = (intfstream_internal_t*)calloc(1, sizeof(*intf));
if (!intf)
goto error;
intf->type = info->type;
switch (intf->type)
{
case INTFSTREAM_FILE:
break;
case INTFSTREAM_MEMORY:
intf->memory.writable = info->memory.writable;
if (!intfstream_resize(intf, info))
goto error;
break;
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
intf->chd.track = info->chd.track;
break;
#else
goto error;
#endif
}
return intf;
error:
if (intf)
free(intf);
return NULL;
}
int intfstream_seek(intfstream_internal_t *intf, int offset, int whence)
{
if (!intf)
return -1;
switch (intf->type)
{
case INTFSTREAM_FILE:
{
int seek_position = 0;
switch (whence)
{
case SEEK_SET:
seek_position = RETRO_VFS_SEEK_POSITION_START;
break;
case SEEK_CUR:
seek_position = RETRO_VFS_SEEK_POSITION_CURRENT;
break;
case SEEK_END:
seek_position = RETRO_VFS_SEEK_POSITION_END;
break;
}
return (int)filestream_seek(intf->file.fp, (int)offset,
seek_position);
}
case INTFSTREAM_MEMORY:
return (int)memstream_seek(intf->memory.fp, offset, whence);
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
return (int)chdstream_seek(intf->chd.fp, offset, whence);
#else
break;
#endif
}
return -1;
}
ssize_t intfstream_read(intfstream_internal_t *intf, void *s, size_t len)
{
if (!intf)
return 0;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_read(intf->file.fp, s, len);
case INTFSTREAM_MEMORY:
return memstream_read(intf->memory.fp, s, len);
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
return chdstream_read(intf->chd.fp, s, len);
#else
break;
#endif
}
return -1;
}
ssize_t intfstream_write(intfstream_internal_t *intf,
const void *s, size_t len)
{
if (!intf)
return 0;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_write(intf->file.fp, s, len);
case INTFSTREAM_MEMORY:
return memstream_write(intf->memory.fp, s, len);
case INTFSTREAM_CHD:
return -1;
}
return 0;
}
char *intfstream_gets(intfstream_internal_t *intf,
char *buffer, size_t len)
{
if (!intf)
return NULL;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_gets(intf->file.fp, buffer, len);
case INTFSTREAM_MEMORY:
return memstream_gets(intf->memory.fp, buffer, len);
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
return chdstream_gets(intf->chd.fp, buffer, len);
#else
break;
#endif
}
return NULL;
}
int intfstream_getc(intfstream_internal_t *intf)
{
if (!intf)
return -1;
switch (intf->type)
{
case INTFSTREAM_FILE:
return filestream_getc(intf->file.fp);
case INTFSTREAM_MEMORY:
return memstream_getc(intf->memory.fp);
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
return chdstream_getc(intf->chd.fp);
#else
break;
#endif
}
return -1;
}
int intfstream_tell(intfstream_internal_t *intf)
{
if (!intf)
return -1;
switch (intf->type)
{
case INTFSTREAM_FILE:
return (int)filestream_tell(intf->file.fp);
case INTFSTREAM_MEMORY:
return (int)memstream_pos(intf->memory.fp);
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
return (int)chdstream_tell(intf->chd.fp);
#else
break;
#endif
}
return -1;
}
void intfstream_rewind(intfstream_internal_t *intf)
{
switch (intf->type)
{
case INTFSTREAM_FILE:
filestream_rewind(intf->file.fp);
break;
case INTFSTREAM_MEMORY:
memstream_rewind(intf->memory.fp);
break;
case INTFSTREAM_CHD:
#ifdef HAVE_CHD
chdstream_rewind(intf->chd.fp);
#endif
break;
}
}
void intfstream_putc(intfstream_internal_t *intf, int c)
{
if (!intf)
return;
switch (intf->type)
{
case INTFSTREAM_FILE:
filestream_putc(intf->file.fp, c);
break;
case INTFSTREAM_MEMORY:
memstream_putc(intf->memory.fp, c);
break;
case INTFSTREAM_CHD:
break;
}
}
intfstream_t* intfstream_open_file(const char *path,
unsigned mode, unsigned hints)
{
intfstream_info_t info;
intfstream_t *fd = NULL;
info.type = INTFSTREAM_FILE;
fd = (intfstream_t*)intfstream_init(&info);
if (!fd)
return NULL;
if (!intfstream_open(fd, path, mode, hints))
goto error;
return fd;
error:
if (fd)
{
intfstream_close(fd);
free(fd);
}
return NULL;
}
intfstream_t *intfstream_open_memory(void *data,
unsigned mode, unsigned hints, size_t size)
{
intfstream_info_t info;
intfstream_t *fd = NULL;
info.type = INTFSTREAM_MEMORY;
info.memory.buf.data = (uint8_t*)data;
info.memory.buf.size = size;
info.memory.writable = false;
fd = (intfstream_t*)intfstream_init(&info);
if (!fd)
return NULL;
if (!intfstream_open(fd, NULL, mode, hints))
goto error;
return fd;
error:
if (fd)
{
intfstream_close(fd);
free(fd);
}
return NULL;
}
intfstream_t *intfstream_open_chd_track(const char *path,
unsigned mode, unsigned hints, int32_t track)
{
intfstream_info_t info;
intfstream_t *fd = NULL;
info.type = INTFSTREAM_CHD;
info.chd.track = track;
fd = (intfstream_t*)intfstream_init(&info);
if (!fd)
return NULL;
if (!intfstream_open(fd, path, mode, hints))
goto error;
return fd;
error:
if (fd)
{
intfstream_close(fd);
free(fd);
}
return NULL;
}
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