Initial community commit

Src/replicant/nsid3v2/frame_popm.cpp

@@ -0,0 +1,95 @@
+#include "nsid3v2.h"
+#include "nsid3v2/header.h"
+#include "nsid3v2/tag.h"
+#include "nsid3v2/frame_utils.h"
+#include "nu/ByteReader.h"
+#include "nx/nxstring.h"
+#if defined(_WIN32) && !defined(strcasecmp)
+#define strcasecmp _stricmp
+#else
+#include <strings.h>
+#endif
+
+struct ParsedPopularimeter
+{
+	ParsedString email;
+	uint8_t rating;
+	uint64_t playcount;
+};
+
+static int ParsePopularimeter(const void *data, size_t data_len, ParsedPopularimeter &parsed)
+{
+	int ret;
+	if (data_len < 6)
+		return NErr_Insufficient;
+
+	bytereader_value_t byte_reader;
+	bytereader_init(&byte_reader, data, data_len);
+
+	/* read email (Always latin-1) */
+	ret = ParseNullTerminatedString(&byte_reader, 0, parsed.email);
+	if (ret != NErr_Success)
+		return ret;
+
+	if (bytereader_size(&byte_reader) == 0)
+		return NErr_Insufficient;
+
+	parsed.rating = bytereader_read_u8(&byte_reader);
+
+	parsed.playcount=0;
+	while (bytereader_size(&byte_reader))
+	{
+
+		parsed.playcount <<= 8;
+		parsed.playcount |= bytereader_read_u8(&byte_reader);
+	}
+	return NErr_Success;
+}
+
+int NSID3v2_Tag_Popularimeter_GetRatingPlaycount(const nsid3v2_tag_t t, const char *email, uint8_t *rating, uint64_t *playcount)
+{
+	const ID3v2::Tag *tag = (const ID3v2::Tag *)t;
+	if (!tag)
+		return NErr_Empty;
+	const ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_POPULARIMETER);
+	while (frame)
+	{
+		const void *data;
+		size_t data_len;
+		ParsedPopularimeter parsed;
+		if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParsePopularimeter(data, data_len, parsed) == NErr_Success)
+		{
+			if (!strcasecmp(email, (const char *)parsed.email.data))
+			{
+				*rating = parsed.rating;
+				*playcount = parsed.playcount;
+				return NErr_Success;
+			}
+
+		}
+		frame = tag->FindNextFrame(frame);
+	}
+
+	return NErr_Empty;
+}
+
+int NSID3v2_Frame_Popularity_Get(nsid3v2_frame_t f, nx_string_t *email, uint8_t *rating, uint64_t *playcount, int text_flags)
+{
+	const ID3v2::Frame *frame = (const ID3v2::Frame *)f;
+	if (frame)
+	{
+		const void *data;
+		size_t data_len;
+		ParsedPopularimeter parsed;
+		if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParsePopularimeter(data, data_len, parsed) == NErr_Success)
+		{
+			int ret = NXStringCreateFromParsedString(email, parsed.email, text_flags);
+			if (ret != NErr_Success)
+				return ret;
+			*rating = parsed.rating;
+			*playcount = parsed.playcount;
+			return NErr_Success;
+		}
+	}
+	return NErr_Empty;
+}