158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "EbmlWriter.h"
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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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#include <limits.h>
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#if defined(_MSC_VER)
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#define LITERALU64(n) n
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#else
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#define LITERALU64(n) n##LLU
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#endif
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void Ebml_WriteLen(EbmlGlobal *glob, int64_t val) {
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/* TODO check and make sure we are not > than 0x0100000000000000LLU */
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unsigned char size = 8; /* size in bytes to output */
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/* mask to compare for byte size */
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int64_t minVal = 0xff;
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for (size = 1; size < 8; size ++) {
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if (val < minVal)
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break;
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minVal = (minVal << 7);
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}
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val |= (((uint64_t)0x80) << ((size - 1) * 7));
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Ebml_Serialize(glob, (void *) &val, sizeof(val), size);
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}
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void Ebml_WriteString(EbmlGlobal *glob, const char *str) {
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const size_t size_ = strlen(str);
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const uint64_t size = size_;
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Ebml_WriteLen(glob, size);
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/* TODO: it's not clear from the spec whether the nul terminator
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* should be serialized too. For now we omit the null terminator.
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*/
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Ebml_Write(glob, str, (unsigned long)size);
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}
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void Ebml_WriteUTF8(EbmlGlobal *glob, const wchar_t *wstr) {
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const size_t strlen = wcslen(wstr);
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/* TODO: it's not clear from the spec whether the nul terminator
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* should be serialized too. For now we include it.
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*/
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const uint64_t size = strlen;
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Ebml_WriteLen(glob, size);
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Ebml_Write(glob, wstr, (unsigned long)size);
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}
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void Ebml_WriteID(EbmlGlobal *glob, unsigned long class_id) {
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int len;
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if (class_id >= 0x01000000)
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len = 4;
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else if (class_id >= 0x00010000)
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len = 3;
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else if (class_id >= 0x00000100)
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len = 2;
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else
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len = 1;
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Ebml_Serialize(glob, (void *)&class_id, sizeof(class_id), len);
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}
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void Ebml_SerializeUnsigned64(EbmlGlobal *glob, unsigned long class_id, uint64_t ui) {
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unsigned char sizeSerialized = 8 | 0x80;
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Ebml_WriteID(glob, class_id);
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Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
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Ebml_Serialize(glob, &ui, sizeof(ui), 8);
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}
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void Ebml_SerializeUnsigned(EbmlGlobal *glob, unsigned long class_id, unsigned long ui) {
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unsigned char size = 8; /* size in bytes to output */
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unsigned char sizeSerialized = 0;
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unsigned long minVal;
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Ebml_WriteID(glob, class_id);
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minVal = 0x7fLU; /* mask to compare for byte size */
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for (size = 1; size < 4; size ++) {
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if (ui < minVal) {
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break;
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}
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minVal <<= 7;
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}
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sizeSerialized = 0x80 | size;
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Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
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Ebml_Serialize(glob, &ui, sizeof(ui), size);
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}
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/* TODO: perhaps this is a poor name for this id serializer helper function */
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void Ebml_SerializeBinary(EbmlGlobal *glob, unsigned long class_id, unsigned long bin) {
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int size;
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for (size = 4; size > 1; size--) {
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if (bin & (unsigned int)0x000000ff << ((size - 1) * 8))
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break;
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}
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Ebml_WriteID(glob, class_id);
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Ebml_WriteLen(glob, size);
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Ebml_WriteID(glob, bin);
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}
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void Ebml_SerializeFloat(EbmlGlobal *glob, unsigned long class_id, double d) {
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unsigned char len = 0x88;
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Ebml_WriteID(glob, class_id);
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Ebml_Serialize(glob, &len, sizeof(len), 1);
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Ebml_Serialize(glob, &d, sizeof(d), 8);
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}
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void Ebml_WriteSigned16(EbmlGlobal *glob, short val) {
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signed long out = ((val & 0x003FFFFF) | 0x00200000) << 8;
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Ebml_Serialize(glob, &out, sizeof(out), 3);
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}
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void Ebml_SerializeString(EbmlGlobal *glob, unsigned long class_id, const char *s) {
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Ebml_WriteID(glob, class_id);
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Ebml_WriteString(glob, s);
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}
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void Ebml_SerializeUTF8(EbmlGlobal *glob, unsigned long class_id, wchar_t *s) {
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Ebml_WriteID(glob, class_id);
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Ebml_WriteUTF8(glob, s);
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}
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void Ebml_SerializeData(EbmlGlobal *glob, unsigned long class_id, unsigned char *data, unsigned long data_length) {
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Ebml_WriteID(glob, class_id);
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Ebml_WriteLen(glob, data_length);
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Ebml_Write(glob, data, data_length);
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}
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void Ebml_WriteVoid(EbmlGlobal *glob, unsigned long vSize) {
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unsigned char tmp = 0;
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unsigned long i = 0;
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Ebml_WriteID(glob, 0xEC);
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Ebml_WriteLen(glob, vSize);
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for (i = 0; i < vSize; i++) {
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Ebml_Write(glob, &tmp, 1);
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}
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}
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/* TODO Serialize Date */
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