I have defined such structure:
typedef struct _Lib3dsBuffer {
long offset; // current position
long size; // buffer size
const char *buffer; // buffer
} Lib3dsBuffer;
//Seek function:
static long
bufferio_seek_func(void *self, long offset, Lib3dsIoSeek origin) {
Lib3dsBuffer *f = (Lib3dsBuffer *)self;
switch (origin)
{
case LIB3DS_SEEK_SET:
f->offset = offset; // no need of this I think
break;
case LIB3DS_SEEK_CUR:
f->offset += offset;
break;
case LIB3DS_SEEK_END:
f->offset = (f->size + offset);
break;
default:
ASSERT(0);
return(0);
}
return 1;
}
// Tell function:
static long
bufferio_tell_func(void *self) {
Lib3dsBuffer *f = (Lib3dsBuffer*)self;
return f->offset;
}
// Read function
static int
bufferio_read_func(void *self, Lib3dsByte *buffer, int size) {
Lib3dsBuffer *f = (Lib3dsBuffer *)self;
memcpy(buffer, f->buffer + f->offset, size);
f->offset += size;
return size;
}
// error handling (don't know what should be here....)
static Lib3dsBool
bufferio_error_func(void *self) {
// no errors handled
return 0;
}
// Main function to read data
Lib3dsFile*
lib3ds_buffer_load(const char *buffer)
{
Lib3dsBuffer *f;
Lib3dsFile *file;
Lib3dsIo *io;
f = (Lib3dsBuffer*)calloc(sizeof(Lib3dsBuffer),1); // not sure about
calloc usage
f->buffer = buffer;
if (!f)
{
return(0);
}
file = lib3ds_file_new();
if (!file)
{
free(f);
return(0);
}
io = lib3ds_io_new(
f,
bufferio_error_func,
bufferio_seek_func,
bufferio_tell_func,
bufferio_read_func,
NULL // no write function
);
if (!io)
{
lib3ds_file_free(file);
free(f);
return(0);
}
if (!lib3ds_file_read(file, io)) {
free(file);
free(f);
return(0);
}
lib3ds_io_free(io);
free(f);
return(file);
}
To do tests on implemented functions I have changed player.c
FILE *pFile;
....
pFile = fopen(filepath, "rb");
fseek(pFile, 0, SEEK_END);
nFileSize = ftell(pFile);
fseek(pFile, 0, SEEK_SET);
buffer = malloc(nFileSize)
fread(buffer, 1, nFileSize, pFile);
fclose(pFile);
// file=lib3ds_file_load(filepath);
file=lib3ds_buffer_load(buffer);
Tomas
P.S. Thanks to the author of lib3ds for the very good design
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