update cspot

components/spotify/cspot/bell/src/audio/container/WebmUtils.cpp

@@ -0,0 +1,67 @@
+// Copyright (c) Kuba Szczodrzyński 2022-1-16.
+
+#include "WebmContainer.h"
+
+uint32_t WebmContainer::readVarNum32(bool raw) {
+	uint32_t result = readUint8();
+	if (!result) {
+		closed = true;
+		return 0;
+	}
+	uint8_t len = 0;
+	for (; !(result >> (7 - len)); len++) {}
+	if (!raw)
+		result &= ~(1 << (7 - len));
+	for (uint8_t i = 0; i < len; i++) {
+		result <<= 8;
+		result |= readUint8();
+	}
+	return result;
+}
+
+uint64_t WebmContainer::readVarNum64() {
+	uint64_t result = readUint8();
+	if (!result) {
+		closed = true;
+		return 0;
+	}
+	uint8_t len = 0;
+	for (; !(result >> (7 - len)); len++) {}
+	result &= ~(1 << (7 - len));
+	for (uint8_t i = 0; i < len; i++) {
+		result <<= 8;
+		result |= readUint8();
+	}
+	return result;
+}
+
+uint32_t WebmContainer::readUint(uint8_t len) {
+	if (len >= 4) {
+		skipBytes(len - 4);
+		return readUint32();
+	}
+	if (len == 3)
+		return readUint24();
+	if (len == 2)
+		return readUint16();
+	return readUint8();
+}
+
+uint64_t WebmContainer::readUlong(uint8_t len) {
+	if (len == 8)
+		return readUint64();
+	return readUint(len);
+}
+
+float WebmContainer::readFloat(uint8_t len) {
+	double result = 0;
+	auto *b = (uint8_t *)&result;
+	for (uint8_t i = 0; i < len; i++)
+		b[len - i - 1] = readUint8();
+	return (float)result;
+}
+
+void WebmContainer::readElem() {
+	eid = (ElementId)readVarNum32(true);
+	esize = readVarNum32();
+}