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-rw-r--r--media/libmkv/EbmlWriter.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/media/libmkv/EbmlWriter.c b/media/libmkv/EbmlWriter.c
new file mode 100644
index 000000000..087e8176a
--- /dev/null
+++ b/media/libmkv/EbmlWriter.c
@@ -0,0 +1,165 @@
+/*
+ * 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>
+#include "EbmlBufferWriter.h"
+#if defined(_MSC_VER)
+#define LITERALU64(n) n
+#else
+#define LITERALU64(n) n##LLU
+#endif
+
+void Ebml_WriteLen(EbmlGlobal *glob, int64_t val) {
+ /* TODO check and make sure we are not > than 0x0100000000000000LLU */
+ unsigned char size = 8; /* size in bytes to output */
+
+ /* mask to compare for byte size */
+ int64_t minVal = 0xff;
+
+ for (size = 1; size < 8; size ++) {
+ if (val < minVal)
+ break;
+
+ minVal = (minVal << 7);
+ }
+
+ val |= (((uint64_t)0x80) << ((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 uint64_t 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, (unsigned long)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 uint64_t size = strlen;
+
+ Ebml_WriteLen(glob, size);
+ Ebml_Write(glob, wstr, (unsigned long)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_SerializeUnsigned32(EbmlGlobal *glob, unsigned long class_id, uint32_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), 4);
+}
+
+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 & (unsigned int)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 */