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// The authors have released ID3Lib as Public Domain (PD) and claim no copyright,
// patent or other intellectual property protection in this work. This means that
// it may be modified, redistributed and used in commercial and non-commercial
// software and hardware without restrictions. ID3Lib is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
//
// The ID3Lib authors encourage improvements and optimisations to be sent to the
// ID3Lib coordinator, currently Dirk Mahoney (dirk@id3.org). Approved
// submissions may be altered, and will be included and released under these terms.
//
// Mon Nov 23 18:34:01 1998
#include <string.h>
#include <memory.h>
#include "id3_header_tag.h"
#include "id3_error.h"
// Analyses a buffer to determine if we have a valid ID3v2 tag header.
// If so, return the number of bytes (starting _after_ the header) to
// read so we get all of the tag
lsint ID3_IsTagHeader(uchar header[ID3_TAGHEADERSIZE])
{
if (!memcmp ("ID3", header, 3) && header[3] <= MAX_ID3_TAGVERSION)
{
int28 temp(&header[6]);
return (int)temp.get();
}
return -1;
}
luint ID3_TagHeader::Size(void)
{
luint bytesUsed = ID3_TAGHEADERSIZE;
if (info && info->hasExtHeader)
bytesUsed += info->extHeaderBytes + sizeof (luint);
return bytesUsed;
}
luint ID3_TagHeader::Render(uchar *buffer)
{
luint bytesUsed = 0;
memcpy (&buffer[bytesUsed], (uchar *) ID3_TAGID, strlen (ID3_TAGID));
bytesUsed += strlen (ID3_TAGID);
buffer[bytesUsed++] = version;
buffer[bytesUsed++] = revision;
// do the automatic flags
if (info->setExpBit)
flags |= ID3HF_EXPERIMENTAL;
if (info->hasExtHeader)
flags |= ID3HF_EXTENDEDHEADER;
// set the flags byte in the header
buffer[bytesUsed++] = (uchar) (flags & 0xFF);
int28 temp = (uint32_t)dataSize;
for (luint i = 0; i < sizeof (luint); i++)
buffer[bytesUsed++] = temp[i];
// now we render the extended header
if (info->hasExtHeader)
{
luint i;
for (i = 0; i < sizeof (luint); i++)
buffer[bytesUsed + i] = (uchar) ((info->extHeaderBytes >> ((sizeof (luint) - i - 1) * 8)) & 0xFF);
bytesUsed += i;
}
bytesUsed = Size();
return bytesUsed;
}
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