1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libmkv/EbmlBufferWriter.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,79 @@
1.4 +// #include <strmif.h>
1.5 +#include "EbmlBufferWriter.h"
1.6 +#include "EbmlWriter.h"
1.7 +// #include <cassert>
1.8 +// #include <limits>
1.9 +// #include <malloc.h> //_alloca
1.10 +#include <stdlib.h>
1.11 +#include <wchar.h>
1.12 +#include <string.h>
1.13 +
1.14 +void
1.15 +Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, int buffer_size, unsigned long len)
1.16 +{
1.17 + /* buffer_size:
1.18 + * 1 - int8_t;
1.19 + * 2 - int16_t;
1.20 + * 3 - int32_t;
1.21 + * 4 - int64_t;
1.22 + */
1.23 + long i;
1.24 + for(i = len-1; i >= 0; i--) {
1.25 + unsigned char x;
1.26 + if (buffer_size == 1) {
1.27 + x = (char)(*(const int8_t *)buffer_in >> (i * 8));
1.28 + } else if (buffer_size == 2) {
1.29 + x = (char)(*(const int16_t *)buffer_in >> (i * 8));
1.30 + } else if (buffer_size == 4) {
1.31 + x = (char)(*(const int32_t *)buffer_in >> (i * 8));
1.32 + } else if (buffer_size == 8) {
1.33 + x = (char)(*(const int64_t *)buffer_in >> (i * 8));
1.34 + }
1.35 + Ebml_Write(glob, &x, 1);
1.36 + }
1.37 +}
1.38 +
1.39 +void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
1.40 + unsigned char *src = glob->buf;
1.41 + src += glob->offset;
1.42 + memcpy(src, buffer_in, len);
1.43 + glob->offset += len;
1.44 +}
1.45 +
1.46 +static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) {
1.47 + while (q != p) {
1.48 + --q;
1.49 +
1.50 + memcpy(&(glob->buf[glob->offset]), q, 1);
1.51 + glob->offset++;
1.52 + }
1.53 +}
1.54 +
1.55 +/*
1.56 +void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
1.57 + // assert(buf);
1.58 +
1.59 + const unsigned char *const p = (const unsigned char *)(buffer_in);
1.60 + const unsigned char *const q = p + len;
1.61 +
1.62 + _Serialize(glob, p, q);
1.63 +}
1.64 +*/
1.65 +
1.66 +void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) {
1.67 + unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLL;
1.68 + Ebml_WriteID(glob, class_id);
1.69 + ebmlLoc->offset = glob->offset;
1.70 + // todo this is always taking 8 bytes, this may need later optimization
1.71 + Ebml_Serialize(glob, (void *)&unknownLen,sizeof(unknownLen), 8); // this is a key that says lenght unknown
1.72 +}
1.73 +
1.74 +void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
1.75 + unsigned long long size = glob->offset - ebmlLoc->offset - 8;
1.76 + unsigned long long curOffset = glob->offset;
1.77 + glob->offset = ebmlLoc->offset;
1.78 + size |= 0x0100000000000000LL;
1.79 + Ebml_Serialize(glob, &size,sizeof(size), 8);
1.80 + glob->offset = curOffset;
1.81 +}
1.82 +
