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// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
#include "EbmlWriter.h"
#include <stdlib.h>
#include <wchar.h>
#include <string.h>
#include <limits.h>
#if defined(_MSC_VER)
#define LITERALU64(n) n
#else
#define LITERALU64(n) n##LLU
#endif
void Ebml_WriteLen(EbmlGlobal *glob, long long val) {
// TODO check and make sure we are not > than 0x0100000000000000LLU
unsigned char size = 8; // size in bytes to output
unsigned long long minVal = LITERALU64(0x00000000000000ff); // mask to compare for byte size
for (size = 1; size < 8; size ++) {
if (val < minVal)
break;
minVal = (minVal << 7);
}
val |= (LITERALU64(0x000000000000080) << ((size - 1) * 7));
Ebml_Serialize(glob, (void *) &val, sizeof(val), size);
}
void Ebml_WriteString(EbmlGlobal *glob, const char *str) {
const size_t size_ = strlen(str);
const unsigned long long size = size_;
Ebml_WriteLen(glob, size);
// TODO: it's not clear from the spec whether the nul terminator
// should be serialized too. For now we omit the null terminator.
Ebml_Write(glob, str, size);
}
void Ebml_WriteUTF8(EbmlGlobal *glob, const wchar_t *wstr) {
const size_t strlen = wcslen(wstr);
// TODO: it's not clear from the spec whether the nul terminator
// should be serialized too. For now we include it.
const unsigned long long size = strlen;
Ebml_WriteLen(glob, size);
Ebml_Write(glob, wstr, size);
}
void Ebml_WriteID(EbmlGlobal *glob, unsigned long class_id) {
int len;
if (class_id >= 0x01000000)
len = 4;
else if (class_id >= 0x00010000)
len = 3;
else if (class_id >= 0x00000100)
len = 2;
else
len = 1;
Ebml_Serialize(glob, (void *)&class_id, sizeof(class_id), len);
}
void Ebml_SerializeUnsigned64(EbmlGlobal *glob, unsigned long class_id, uint64_t ui) {
unsigned char sizeSerialized = 8 | 0x80;
Ebml_WriteID(glob, class_id);
Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
Ebml_Serialize(glob, &ui, sizeof(ui), 8);
}
void Ebml_SerializeUnsigned(EbmlGlobal *glob, unsigned long class_id, unsigned long ui) {
unsigned char size = 8; // size in bytes to output
unsigned char sizeSerialized = 0;
unsigned long minVal;
Ebml_WriteID(glob, class_id);
minVal = 0x7fLU; // mask to compare for byte size
for (size = 1; size < 4; size ++) {
if (ui < minVal) {
break;
}
minVal <<= 7;
}
sizeSerialized = 0x80 | size;
Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
Ebml_Serialize(glob, &ui, sizeof(ui), size);
}
// TODO: perhaps this is a poor name for this id serializer helper function
void Ebml_SerializeBinary(EbmlGlobal *glob, unsigned long class_id, unsigned long bin) {
int size;
for (size = 4; size > 1; size--) {
if (bin & 0x000000ff << ((size - 1) * 8))
break;
}
Ebml_WriteID(glob, class_id);
Ebml_WriteLen(glob, size);
Ebml_WriteID(glob, bin);
}
void Ebml_SerializeFloat(EbmlGlobal *glob, unsigned long class_id, double d) {
unsigned char len = 0x88;
Ebml_WriteID(glob, class_id);
Ebml_Serialize(glob, &len, sizeof(len), 1);
Ebml_Serialize(glob, &d, sizeof(d), 8);
}
void Ebml_WriteSigned16(EbmlGlobal *glob, short val) {
signed long out = ((val & 0x003FFFFF) | 0x00200000) << 8;
Ebml_Serialize(glob, &out, sizeof(out), 3);
}
void Ebml_SerializeString(EbmlGlobal *glob, unsigned long class_id, const char *s) {
Ebml_WriteID(glob, class_id);
Ebml_WriteString(glob, s);
}
void Ebml_SerializeUTF8(EbmlGlobal *glob, unsigned long class_id, wchar_t *s) {
Ebml_WriteID(glob, class_id);
Ebml_WriteUTF8(glob, s);
}
void Ebml_SerializeData(EbmlGlobal *glob, unsigned long class_id, unsigned char *data, unsigned long data_length) {
Ebml_WriteID(glob, class_id);
Ebml_WriteLen(glob, data_length);
Ebml_Write(glob, data, data_length);
}
void Ebml_WriteVoid(EbmlGlobal *glob, unsigned long vSize) {
unsigned char tmp = 0;
unsigned long i = 0;
Ebml_WriteID(glob, 0xEC);
Ebml_WriteLen(glob, vSize);
for (i = 0; i < vSize; i++) {
Ebml_Write(glob, &tmp, 1);
}
}
// TODO Serialize Date
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