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(nbio_stdio.c) Some changes

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This commit is contained in:
twinaphex 2015-03-18 03:51:58 +01:00
parent 0d563f1b28
commit fd338160bc
1 changed files with 36 additions and 20 deletions
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56
libretro-common/file/nbio/nbio_stdio.c
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@ -16,6 +16,7 @@ struct nbio_t
* -2 - the pointer was reallocated since the last operation
*/
signed char op;
signed char mode;
};
static const char * modes[]={ "rb", "wb", "r+b" };
@ -23,20 +24,17 @@ static const char * modes[]={ "rb", "wb", "r+b" };
struct nbio_t* nbio_open(const char * filename, unsigned mode)
{
struct nbio_t* handle = NULL;
FILE* f=fopen(filename, modes[mode]);
FILE* f = fopen(filename, modes[mode]);
if (!f)
return NULL;
handle=(struct nbio_t*)malloc(sizeof(struct nbio_t));
handle = (struct nbio_t*)malloc(sizeof(struct nbio_t));
if (!handle)
{
fclose(f);
return NULL;
}
goto error;
handle->f = f;
handle->len = 0;
handle->f = f;
handle->len = 0;
if (mode != NBIO_WRITE)
{
@ -44,19 +42,23 @@ struct nbio_t* nbio_open(const char * filename, unsigned mode)
handle->len = ftell(handle->f);
}
handle->data = malloc(handle->len);
handle->mode = mode;
handle->data = malloc(handle->len);
if (handle->len && !handle->data)
{
free(handle);
fclose(f);
return NULL;
}
goto error;
handle->progress = handle->len;
handle->op = -2;
handle->progress = handle->len;
handle->op = -2;
return handle;
error:
if (handle)
free(handle);
handle = NULL;
fclose(f);
return NULL;
}
void nbio_begin_read(struct nbio_t* handle)
@ -78,6 +80,9 @@ void nbio_begin_read(struct nbio_t* handle)
void nbio_begin_write(struct nbio_t* handle)
{
if (!handle)
return;
if (handle->op >= 0)
{
puts("ERROR - attempted file write operation while busy");
@ -99,10 +104,15 @@ bool nbio_iterate(struct nbio_t* handle)
if (amount > handle->len - handle->progress)
amount = handle->len - handle->progress;
if (handle->op == NBIO_READ)
fread((char*)handle->data + handle->progress, 1,amount, handle->f);
if (handle->op == NBIO_WRITE)
fwrite((char*)handle->data + handle->progress, 1,amount, handle->f);
switch (handle->op)
{
case NBIO_READ:
fread((char*)handle->data + handle->progress, 1,amount, handle->f);
break;
case NBIO_WRITE:
fwrite((char*)handle->data + handle->progress, 1,amount, handle->f);
break;
}
handle->progress += amount;
@ -113,6 +123,9 @@ bool nbio_iterate(struct nbio_t* handle)
void nbio_resize(struct nbio_t* handle, size_t len)
{
if (!handle)
return;
if (handle->op >= 0)
{
puts("ERROR - attempted file resize operation while busy");
@ -143,6 +156,9 @@ void* nbio_get_ptr(struct nbio_t* handle, size_t* len)
void nbio_cancel(struct nbio_t* handle)
{
if (!handle)
return;
handle->op = -1;
handle->progress = handle->len;
}