winamp/Src/replicant/nsid3v2/frame_popm.cpp
2024-09-24 14:54:57 +02:00

96 lines
2.4 KiB
C++

#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;
}