walkAIFF.cpp

#include <iostream>
#include <cstdio>
#include <limits.h>
#include <set>

#include "file_helpers.hpp"

//	Doc: http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/Docs/AIFF-1.3.pdf

bool gDebug = false;
bool gChecksumChunks = false;

class AIFFFile {
public:
	typedef uint32_t ChunkType;
	typedef uint32_t ChunkSize;
	typedef void (*ChunkProc) (const AIFFFile *f, ChunkType atom, size_t start, size_t length);
	
	AIFFFile (const char *fileName) : file(fileName)
		{
		if (GetChunkType(0) != 'FORM')
			throw std::runtime_error("does not have 'FORM' as the first chunk");
		if (GetChunkSize(0) != size() - 8)
			throw std::runtime_error("FORM size does not match file size");
		if (read32(8) != 'AIFF')
			throw std::runtime_error("expected the form type to be AIFF");
		}

	~AIFFFile() {}
	
	ChunkSize GetChunkSize(size_t offset) const { return read32(offset + 4); }
	ChunkType GetChunkType(size_t offset) const { return read32(offset); }
	size_t size() const { return file.size(); }

	std::string ChunkName(ChunkType at) const {
		std::string retVal ( "    " );
		const unsigned char *p = (const unsigned char *) &at;
		for (int i = 3; i >= 0; --i)
			retVal [ i ] = *p++;
		return retVal;
		}

	template <typename CB>
	void ForEachChunkDo (CB cb) const { ForEachChunkDo(12, size() - 12, cb); }
	
	template <typename CB>
	void ForEachChunkDo (size_t start, size_t length, CB cb) const {
		size_t offset  = start;
		size_t end     = start + length;
	
		while (offset < end) {
			ChunkType at = GetChunkType(offset);
			ChunkSize sz = GetChunkSize(offset);
//  			std::cout << "# Atom: " << at << " of size " << sz << " at offset " << offset << " with " << end - offset << " bytes left" << std::endl;
			if (end - offset < sz)
				throw std::runtime_error(std::string("Chunk '") + ChunkName(at) + "' has a size too big");
		
			cb (this, at, offset + 8, sz > 8 ? sz - 8 : 0);
			offset += sz + 8;
			}
		}

// 00000000  46 4f 52 4d 00 7e 89 16  41 49 46 46 43 4f 4d 4d  |FORM.~..AIFFCOMM|
//	ATOM = 'COMM'; size = 0x00000012
// 00000010  00 00 00 12 00 02 00 1f  8e 1c 00 10 40 0e ac 44  |............@..D|
// 00000020  00 00 00 00 00 00 53 53  4e 44 00 7e 38 78 00 00  |......SSND.~8x..|
//	ATOM = 'SSND'; size = 0x007e3878
// 00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

	const uint8_t * getPointerTo(size_t offset) const
	{
		return file.base() + offset;
	}

	uint32_t read32(size_t offset) const {
		uint32_t retVal = 0;
		const uint8_t *p = getPointerTo(offset);
	
		for (int i = 0; i < 4; ++i) {
			retVal <<= 8;
			retVal |= *p++;
		}

	return retVal;
	}

private:
	MMFile file;
};


char toHex(int i) { return "0123456789ABCDEF"[i]; }


// lifted from http://web.mit.edu/freebsd/head/sys/libkern/crc32.c
const uint32_t crc32_tab[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

uint32_t
crc32(const uint8_t *p, size_t size)
{
	uint32_t crc;
	if (size == 0) return 0;
	
 	crc = ~0U;
 	while (size--)
 		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
 	return crc ^ ~0U;
}
 

struct ChunkCallback {
	ChunkCallback(int indent = 0) : indentStr(indent, ' ') {}
	
	void operator() (const AIFFFile *f, AIFFFile::ChunkType chunk, size_t start, size_t length) {
		std::cout << indentStr << "'" << f->ChunkName(chunk) << "'"
				  << " (" << length << " bytes)";

		if (gChecksumChunks)
			std::cout << " crc32: " << std::hex << crc32(f->getPointerTo(start), length) << std::dec;

		std::cout << std::endl;
		}

	std::string indentStr;
	};


void ProcessAFile(const char *fileName) {
	try {
		AIFFFile f(fileName);
		if (gDebug) {
			std::cout << "Processing " << fileName << std::endl;
			std::cout << "File  is " << f.size() << " bytes long" << std::endl;
			}

		f.ForEachChunkDo(ChunkCallback{});
		std::cout << std::endl;
		}
	catch (const std::runtime_error &e) {
		std::cerr << "## File '" << fileName << "': " << e.what() << std::endl;
		}
	}


int main( int argc, char *argv [] )
{
	if ( argc == 1 ) {
		std::cout << "Usage: " << argv[0] << "[-d] [-c] <list of files>" << std::endl;
		std::cout << "  prints the chunks of the AIFF files" << std::endl;
		return 0;
		}
	
	int startArg = 1;
	if ( std::strcmp ( argv[startArg], "-d" ) == 0 ) {
		gDebug = true;
		startArg++;
		}

	if ( std::strcmp ( argv[startArg], "-c" ) == 0 ) {
		gChecksumChunks = true;
		startArg++;
		}

 	for ( int i = startArg; i < argc; ++i )
		ProcessAFile(argv[i]);
		
	return 0;
}