diff options
Diffstat (limited to 'Src/replicant/nsid3v2/frame_id.cpp')
| -rw-r--r-- | Src/replicant/nsid3v2/frame_id.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Src/replicant/nsid3v2/frame_id.cpp b/Src/replicant/nsid3v2/frame_id.cpp new file mode 100644 index 00000000..807d8cd6 --- /dev/null +++ b/Src/replicant/nsid3v2/frame_id.cpp @@ -0,0 +1,167 @@ +#include "nsid3v2.h" +#include "nsid3v2/header.h" +#include "nsid3v2/tag.h" +#include "nsid3v2/frame_utils.h" +#include "nu/ByteReader.h" +#include "nu/ByteWriter.h" +#include "nx/nxstring.h" + +struct ParsedID +{ + ParsedString owner; + const void *identifier_data; + size_t identifier_byte_length; +}; + +static int ParseID(const void *data, size_t data_len, ParsedID &parsed) +{ + int ret; + if (data_len < 1) + return NErr_Insufficient; + + bytereader_value_t byte_reader; + bytereader_init(&byte_reader, data, data_len); + + /* owner is always latin-1 */ + ret = ParseNullTerminatedString(&byte_reader, 0, parsed.owner); + if (ret != NErr_Success) + return ret; + parsed.identifier_data = bytereader_pointer(&byte_reader); + parsed.identifier_byte_length = bytereader_size(&byte_reader); + return NErr_Success; +} + +int NSID3v2_Tag_ID_Find(const nsid3v2_tag_t t, const char *owner, nsid3v2_frame_t *out_frame, int text_flags) +{ + const ID3v2::Tag *tag = (const ID3v2::Tag *)t; + if (!tag) + return NErr_Empty; + const ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID); + while (frame) + { + const void *data; + size_t data_len; + ParsedID parsed; + if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags))) + { + *out_frame = (nsid3v2_frame_t)frame; + return NErr_Success; + } + frame = tag->FindNextFrame(frame); + } + + return NErr_Empty; +} + +int NSID3v2_Frame_ID_Get(nsid3v2_frame_t f, nx_string_t *owner, const void **id_data, size_t *length, int text_flags) +{ + const ID3v2::Frame *frame = (const ID3v2::Frame *)f; + if (frame) + { + const void *data; + size_t data_len; + ParsedID parsed; + if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success) + { + if (owner) + { + int ret = NXStringCreateFromParsedString(owner, parsed.owner, text_flags); + if (ret != NErr_Success) + return ret; + } + + *id_data = parsed.identifier_data; + *length = parsed.identifier_byte_length; + + return NErr_Success; + } + + } + return NErr_Empty; +} + +int NSID3v2_Tag_ID_Get(const nsid3v2_tag_t t, const char *owner, const void **id_data, size_t *length, int text_flags) +{ + const ID3v2::Tag *tag = (const ID3v2::Tag *)t; + if (!tag) + return NErr_Empty; + + ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID); + while (frame) + { + const void *data; + size_t data_len; + ParsedID parsed; + if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags))) + { + *id_data = parsed.identifier_data; + *length = parsed.identifier_byte_length; + + return NErr_Success; + } + + frame = tag->FindNextFrame(frame); + } + return NErr_Empty; +} + + + +/* ---------------- Setters ---------------- */ +int NSID3v2_Frame_ID_Set(nsid3v2_frame_t f, const char *owner, const void *id_data, size_t length, int text_flags) +{ + ID3v2::Frame *frame = (ID3v2::Frame *)f; + if (frame) + { + size_t owner_length=owner?strlen(owner):0; + + /* TODO: overflow check */ + size_t total_size = owner_length + 1 + length; + + void *data; + size_t data_len; + int ret = frame->NewData(total_size, &data, &data_len); + if (ret != NErr_Success) + return ret; + + bytewriter_s byte_writer; + bytewriter_init(&byte_writer, data, data_len); + bytewriter_write_n(&byte_writer, owner, owner_length); + bytewriter_write_u8(&byte_writer, 0); // write null terminator separately, in case owner is NULL + bytewriter_write_n(&byte_writer, id_data, length); + + return NErr_Success; + } + return NErr_Empty; +} + +int NSID3v2_Tag_ID_Set(nsid3v2_tag_t t, const char *owner, const void *id_data, size_t length, int text_flags) +{ + ID3v2::Tag *tag = (ID3v2::Tag *)t; + if (!tag) + return NErr_Empty; + + ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID); + while (frame) + { + const void *data; + size_t data_len; + ParsedID parsed; + if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags))) + { + break; + } + + frame = tag->FindNextFrame(frame); + } + + if (!frame) + { + frame = tag->NewFrame(NSID3V2_FRAME_ID, 0); + if (!frame) + return NErr_OutOfMemory; + tag->AddFrame(frame); + } + + return NSID3v2_Frame_ID_Set((nsid3v2_frame_t)frame, owner, id_data, length, text_flags); +} |