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Jef
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16440 changed files with 4239995 additions and 2 deletions
265
Src/replicant/nsid3v2/frame_utils.cpp
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265
Src/replicant/nsid3v2/frame_utils.cpp
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#include "frame_utils.h"
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#include "foundation/error.h"
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#include "nsid3v2/nsid3v2.h"
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#if defined(_WIN32) && !defined(strcasecmp)
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#define strcasecmp _stricmp
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#else
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#include <string.h>
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#endif
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int ParseDescription(const char *&str, size_t &data_len, size_t &str_cch)
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{
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str_cch=0;
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while (data_len && str[str_cch])
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{
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data_len--;
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str_cch++;
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}
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if (!data_len)
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return NErr_Error;
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data_len--;
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return NErr_Success;
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}
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int ParseDescription(const wchar_t *&str, size_t &data_len, size_t &str_cch, uint8_t &str_encoding)
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{
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str_cch=0;
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if (data_len > 2 && str[0] == 0xFFFE)
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{
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str_encoding=2;
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str++;
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str-=3;
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}
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else if (data_len > 2 && str[0] == 0xFEFF)
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{
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str_encoding=1;
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str++;
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data_len-=3;
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}
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else
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{
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data_len--;
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}
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while (data_len > 1 && str[str_cch])
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{
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data_len-=2;
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str_cch++;
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}
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if (!data_len)
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return NErr_Error;
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data_len-=2;
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return NErr_Success;
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}
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static void ParseBOM(bytereader_t reader, uint8_t *encoding, const uint8_t default_encoding)
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{
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if (bytereader_size(reader) >= 2)
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{
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uint16_t bom = bytereader_show_u16_le(reader);
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if (bom == 0xFFFE)
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{
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bytereader_advance(reader, 2);
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*encoding=2;
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}
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else if (bom == 0xFEFF)
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{
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bytereader_advance(reader, 2);
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*encoding=1;
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}
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else
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{
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*encoding=default_encoding;
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}
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}
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else
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{
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*encoding=default_encoding;
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}
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}
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int ParseNullTerminatedString(bytereader_t reader, uint8_t encoding, ParsedString &parsed)
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{
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switch(encoding)
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{
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case 0: // ISO-8859-1
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if (bytereader_size(reader) == 0)
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return NErr_Insufficient;
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parsed.encoding = 0;
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = 0;
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while (bytereader_size(reader) && bytereader_read_u8(reader))
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parsed.byte_length++;
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return NErr_Success;
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case 1: // UTF-16
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if (bytereader_size(reader) < 2)
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return NErr_Insufficient;
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parsed.byte_length = 0;
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ParseBOM(reader, &parsed.encoding, 1);
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parsed.data = bytereader_pointer(reader);
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while (bytereader_size(reader) && bytereader_read_u16_le(reader))
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parsed.byte_length+=2;
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return NErr_Success;
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case 2: // UTF-16BE
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if (bytereader_size(reader) < 2)
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return NErr_Insufficient;
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parsed.byte_length = 0;
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ParseBOM(reader, &parsed.encoding, 2);
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parsed.data = bytereader_pointer(reader);
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while (bytereader_size(reader) && bytereader_read_u16_le(reader))
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parsed.byte_length+=2;
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return NErr_Success;
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case 3: // UTF-8
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if (bytereader_size(reader) == 0)
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return NErr_Insufficient;
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parsed.encoding = 3;
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = 0;
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size_t start = bytereader_size(reader);
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#if 0 // TODO
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/* check for UTF-8 BOM and skip it */
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if (bytereader_size(reader) > 3 && bytereader_read_u8(reader) == 0xEF && bytereader_read_u8(reader) == 0xBB && bytereader_read_u8(reader) == 0xBF)
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{
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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}
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else
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{
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/* no BOM but skip however far we read into the string */
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size_t offset = start - bytereader_size(reader);
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parsed.data = (const uint8_t *)parsed.data + offset;
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parsed.byte_length -= offset;
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}
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#endif
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/* finish it up */
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while (bytereader_size(reader) && bytereader_read_u8(reader))
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parsed.byte_length++;
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return NErr_Success;
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}
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return NErr_Unknown;
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}
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int ParseFrameTerminatedString(bytereader_t reader, uint8_t encoding, ParsedString &parsed)
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{
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switch(encoding)
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{
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case 0: // ISO-8859-1
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parsed.encoding = 0;
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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return NErr_Success;
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case 1: // UTF-16
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if ((bytereader_size(reader) & 1) == 1)
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return NErr_Error;
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ParseBOM(reader, &parsed.encoding, 1);
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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return NErr_Success;
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case 2: // UTF-16BE
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if ((bytereader_size(reader) & 1) == 1)
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return NErr_Error;
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ParseBOM(reader, &parsed.encoding, 2);
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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return NErr_Success;
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case 3: // UTF-8
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parsed.encoding = 3;
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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if (bytereader_size(reader) > 3 && bytereader_read_u8(reader) == 0xEF && bytereader_read_u8(reader) == 0xBB && bytereader_read_u8(reader) == 0xBF)
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{
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parsed.data = bytereader_pointer(reader);
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parsed.byte_length = bytereader_size(reader);
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}
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return NErr_Success;
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}
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return NErr_Error;
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}
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int NXStringCreateFromParsedString(nx_string_t *value, ParsedString &parsed, int text_flags)
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{
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switch(parsed.encoding)
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{
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case 0: // ISO-8859-1
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if (parsed.byte_length == 0)
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return NXStringCreateEmpty(value);
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if (text_flags & NSID3V2_TEXT_SYSTEM)
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return NXStringCreateWithBytes(value, parsed.data, parsed.byte_length, nx_charset_system);
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else
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return NXStringCreateWithBytes(value, parsed.data, parsed.byte_length, nx_charset_latin1);
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case 1: // UTF-16
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if (parsed.byte_length < 2)
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return NXStringCreateEmpty(value);
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return NXStringCreateWithBytes(value, parsed.data, parsed.byte_length, nx_charset_utf16le);
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case 2: // UTF-16BE
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if (parsed.byte_length < 2)
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return NXStringCreateEmpty(value);
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return NXStringCreateWithBytes(value, parsed.data, parsed.byte_length, nx_charset_utf16be);
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case 3: // UTF-8
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if (parsed.byte_length == 0)
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return NXStringCreateEmpty(value);
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return NXStringCreateWithBytes(value, parsed.data, parsed.byte_length, nx_charset_utf8);
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default:
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return NErr_Unknown;
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}
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}
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bool DescriptionMatches(const ParsedString &parsed, const char *description, int text_flags)
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{
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// see if our description matches
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switch(parsed.encoding)
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{
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case 0: // ISO-8859-1
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return !strcasecmp(description, (const char *)parsed.data);
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case 1:
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{
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bytereader_value_t utf16;
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bytereader_init(&utf16, parsed.data, parsed.byte_length);
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while (*description && bytereader_size(&utf16))
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{
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if ((*description++ & ~0x20) != (bytereader_read_u16_le(&utf16) & ~0x20))
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return false;
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}
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if (*description == 0 && bytereader_size(&utf16) == 0)
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return true;
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else
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return false;
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}
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case 2:
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{
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bytereader_value_t utf16;
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bytereader_init(&utf16, parsed.data, parsed.byte_length);
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while (*description && bytereader_size(&utf16))
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{
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if ((*description++ & ~0x20) != (bytereader_read_u16_be(&utf16) & ~0x20))
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return false;
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}
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if (*description == 0 && bytereader_size(&utf16) == 0)
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return true;
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else
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return false;
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}
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case 3:
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return !strcasecmp(description, (const char *)parsed.data);
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}
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return false;
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}
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