55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
// #include <strmif.h>
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#include "EbmlBufferWriter.h"
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#include "EbmlWriter.h"
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// #include <cassert>
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// #include <limits>
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// #include <malloc.h> //_alloca
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#include <stdlib.h>
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#include <wchar.h>
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#include <string.h>
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void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
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unsigned char *src = glob->buf;
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src += glob->offset;
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memcpy(src, buffer_in, len);
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glob->offset += len;
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}
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static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) {
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while (q != p) {
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--q;
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unsigned long cbWritten;
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memcpy(&(glob->buf[glob->offset]), q, 1);
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glob->offset++;
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}
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}
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void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
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// assert(buf);
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const unsigned char *const p = (const unsigned char *)(buffer_in);
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const unsigned char *const q = p + len;
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_Serialize(glob, p, q);
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}
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void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) {
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Ebml_WriteID(glob, class_id);
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ebmlLoc->offset = glob->offset;
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// todo this is always taking 8 bytes, this may need later optimization
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unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLLU;
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Ebml_Serialize(glob, (void *)&unknownLen, 8); // this is a key that says lenght unknown
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}
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void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
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unsigned long long size = glob->offset - ebmlLoc->offset - 8;
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unsigned long long curOffset = glob->offset;
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glob->offset = ebmlLoc->offset;
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size |= 0x0100000000000000LLU;
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Ebml_Serialize(glob, &size, 8);
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glob->offset = curOffset;
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}
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