The Tor Browser / file comparison
comparison: media/libmkv/EbmlBufferWriter.c
media/libmkv/EbmlBufferWriter.c
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
equal
deleted
inserted
replaced
| -1:000000000000 | 0:b293da069fd5 |
|---|---|
| 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 | |
| 12 Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, int buffer_size, unsigned long len) | |
| 13 { | |
| 14 /* buffer_size: | |
| 15 * 1 - int8_t; | |
| 16 * 2 - int16_t; | |
| 17 * 3 - int32_t; | |
| 18 * 4 - int64_t; | |
| 19 */ | |
| 20 long i; | |
| 21 for(i = len-1; i >= 0; i--) { | |
| 22 unsigned char x; | |
| 23 if (buffer_size == 1) { | |
| 24 x = (char)(*(const int8_t *)buffer_in >> (i * 8)); | |
| 25 } else if (buffer_size == 2) { | |
| 26 x = (char)(*(const int16_t *)buffer_in >> (i * 8)); | |
| 27 } else if (buffer_size == 4) { | |
| 28 x = (char)(*(const int32_t *)buffer_in >> (i * 8)); | |
| 29 } else if (buffer_size == 8) { | |
| 30 x = (char)(*(const int64_t *)buffer_in >> (i * 8)); | |
| 31 } | |
| 32 Ebml_Write(glob, &x, 1); | |
| 33 } | |
| 34 } | |
| 35 | |
| 36 void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) { | |
| 37 unsigned char *src = glob->buf; | |
| 38 src += glob->offset; | |
| 39 memcpy(src, buffer_in, len); | |
| 40 glob->offset += len; | |
| 41 } | |
| 42 | |
| 43 static void _Serialize(EbmlGlobal *glob, const unsigned char *p, const unsigned char *q) { | |
| 44 while (q != p) { | |
| 45 --q; | |
| 46 | |
| 47 memcpy(&(glob->buf[glob->offset]), q, 1); | |
| 48 glob->offset++; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 /* | |
| 53 void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in, unsigned long len) { | |
| 54 // assert(buf); | |
| 55 | |
| 56 const unsigned char *const p = (const unsigned char *)(buffer_in); | |
| 57 const unsigned char *const q = p + len; | |
| 58 | |
| 59 _Serialize(glob, p, q); | |
| 60 } | |
| 61 */ | |
| 62 | |
| 63 void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc, unsigned long class_id) { | |
| 64 unsigned long long unknownLen = 0x01FFFFFFFFFFFFFFLL; | |
| 65 Ebml_WriteID(glob, class_id); | |
| 66 ebmlLoc->offset = glob->offset; | |
| 67 // todo this is always taking 8 bytes, this may need later optimization | |
| 68 Ebml_Serialize(glob, (void *)&unknownLen,sizeof(unknownLen), 8); // this is a key that says lenght unknown | |
| 69 } | |
| 70 | |
| 71 void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) { | |
| 72 unsigned long long size = glob->offset - ebmlLoc->offset - 8; | |
| 73 unsigned long long curOffset = glob->offset; | |
| 74 glob->offset = ebmlLoc->offset; | |
| 75 size |= 0x0100000000000000LL; | |
| 76 Ebml_Serialize(glob, &size,sizeof(size), 8); | |
| 77 glob->offset = curOffset; | |
| 78 } | |
| 79 |
