1 // #include <strmif.h> 2 #include "EbmlBufferWriter.h" 3 #include "EbmlWriter.h" 4 // #include <cassert> 5 // #include <limits> 6 // #include <malloc.h> //_alloca 7 #include <stdlib.h> 8 #include <wchar.h> 9 #include <string.h> 10 11 void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) { 12 unsigned char *src = glob->buf; 13 src += glob->offset; 14 memcpy(src, buffer_in, len); 15 glob->offset += len; 16 } 17 18 static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) { 19 while (q != p) { 20 --q; 21 memcpy(&(glob->buf[glob->offset]), q, 1); 22 glob->offset++; 23 } 24 } 25 26 void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) { 27 // assert(buf); 28 29 const unsigned char *const p = (const unsigned char *)(buffer_in); 30 const unsigned char *const q = p + len; 31 32 _Serialize(glob, p, q); 33 } 34 35 36 void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) { 37 Ebml_WriteID(glob, class_id); 38 ebmlLoc->offset = glob->offset; 39 // todo this is always taking 8 bytes, this may need later optimization 40 unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLLU; 41 Ebml_Serialize(glob, (void *)&unknownLen, 8); // this is a key that says lenght unknown 42 } 43 44 void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) { 45 unsigned long long size = glob->offset - ebmlLoc->offset - 8; 46 unsigned long long curOffset = glob->offset; 47 glob->offset = ebmlLoc->offset; 48 size |= 0x0100000000000000LLU; 49 Ebml_Serialize(glob, &size, 8); 50 glob->offset = curOffset; 51 } 52 53
