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101 lines
2.5 KiB
C++
Executable file
101 lines
2.5 KiB
C++
Executable file
#ifndef __memfile_hpp__
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#define __memfile_hpp__
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#include <cstdlib>
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#include <cstring>
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#include "file.hpp"
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#include "sysdefs.h"
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class MemFile : public JFAudFile {
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private:
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unsigned char *dataptr, *posn;
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long datalen;
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void (*disposalfunc)(void*);
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public:
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MemFile(void *ptr, long len, void (*dispose)(void*))
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{
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dataptr = posn = (unsigned char *)ptr;
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datalen = len;
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disposalfunc = dispose;
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}
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virtual ~MemFile()
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{
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if (disposalfunc) disposalfunc((void*)dataptr);
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else free((void*)dataptr);
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}
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virtual bool IsOpen(void) const { return dataptr != NULL && datalen >= 0; }
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virtual long Read(long nbytes, void *buf)
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{
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long toread = datalen - ((intptr_t)posn - (intptr_t)dataptr);
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if (toread > nbytes) toread = nbytes;
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memcpy(buf, posn, toread);
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posn = (unsigned char *)((intptr_t)posn + toread);
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return toread;
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}
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virtual bool ReadByte(char *c)
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{
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if ((intptr_t)posn - (intptr_t)dataptr >= datalen) return false;
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*c = *(posn++);
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return true;
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}
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virtual bool ReadShort(short *s, bool big=false)
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{
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short ss = 0;
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if ((intptr_t)posn - (intptr_t)dataptr >= datalen-1) return false;
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if (B_LITTLE_ENDIAN == 1) {
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ss = ((short)*(posn++));
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ss |= ((short)*(posn++)) << 8;
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} else {
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ss = ((short)*(posn++)) << 8;
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ss |= ((short)*(posn++));
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}
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*s = ss;
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return true;
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}
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virtual bool ReadLong(int *l, bool big=false)
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{
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short ll = 0;
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if ((intptr_t)posn - (intptr_t)dataptr >= datalen-3) return false;
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if (B_LITTLE_ENDIAN == 1) {
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ll = ((int)*(posn++));
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ll |= ((int)*(posn++)) << 8;
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ll |= ((int)*(posn++)) << 16;
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ll |= ((int)*(posn++)) << 24;
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} else {
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ll = ((int)*(posn++)) << 24;
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ll |= ((int)*(posn++)) << 16;
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ll |= ((int)*(posn++)) << 8;
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ll |= ((int)*(posn++));
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}
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*l = ll;
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return true;
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}
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virtual long Seek(long pos, SeekFrom where)
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{
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if (where == JFAudFile::Set) {
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posn = (unsigned char *)((intptr_t)dataptr + pos);
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} else if (where == JFAudFile::Cur) {
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posn = (unsigned char *)((intptr_t)posn + pos);
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} else if (where == JFAudFile::End) {
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posn = (unsigned char *)((intptr_t)dataptr + datalen + pos);
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} else return -1;
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if ((intptr_t)posn < (intptr_t)dataptr)
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posn = dataptr;
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else if ((intptr_t)posn > ((intptr_t)dataptr + datalen))
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posn = (unsigned char *)((intptr_t)dataptr + datalen);
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return (intptr_t)posn - (intptr_t)dataptr;
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}
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virtual long Tell(void) const { return (intptr_t)posn - (intptr_t)dataptr; }
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virtual long Length(void) const { return datalen; }
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virtual int Rewind(void) { posn = dataptr; return 0; }
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};
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#endif
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