<commit_before>package nsf

import (
	"errors"
	"io"
	"io/ioutil"
	"time"

	"github.com/mjibson/mog/codec/nsf/cpu6502"
)

const (
	// 1.79 MHz
	cpuClock = 236250000 / 11 / 12
)

var (
	// DefaultSampleRate is the default sample rate of a track after calling
	// Init().
	DefaultSampleRate = 44100
	ErrUnrecognized   = errors.New("nsf: unrecognized format")
)

const (
	NSF_HEADER_LEN = 0x80
	NSF_VERSION    = 0x5
	NSF_SONGS      = 0x6
	NSF_START      = 0x7
	NSF_LOAD       = 0x8
	NSF_INIT       = 0xa
	NSF_PLAY       = 0xc
	NSF_SONG       = 0xe
	NSF_ARTIST     = 0x2e
	NSF_COPYRIGHT  = 0x4e
	NSF_SPEED_NTSC = 0x6e
	NSF_BANKSWITCH = 0x70
	NSF_SPEED_PAL  = 0x78
	NSF_PAL_NTSC   = 0x7a
	NSF_EXTRA      = 0x7b
	NSF_ZERO       = 0x7c
)

func ReadNSF(r io.Reader) (n *NSF, err error) {
	n = &NSF{}
	n.b, err = ioutil.ReadAll(r)
	if err != nil {
		return
	}
	if len(n.b) < NSF_HEADER_LEN ||
		string(n.b[0:NSF_VERSION]) != "NESM\u001a" {
		return nil, ErrUnrecognized
	}
	n.Version = n.b[NSF_VERSION]
	n.Songs = n.b[NSF_SONGS]
	n.Start = n.b[NSF_START]
	n.LoadAddr = bLEtoUint16(n.b[NSF_LOAD:])
	n.InitAddr = bLEtoUint16(n.b[NSF_INIT:])<commit_msg>Use standard New init<commit_after>package nsf

import (
	"errors"
	"io"
	"io/ioutil"
	"time"

	"github.com/mjibson/mog/codec/nsf/cpu6502"
)

const (
	// 1.79 MHz
	cpuClock = 236250000 / 11 / 12
)

var (
	// DefaultSampleRate is the default sample rate of a track after calling
	// Init().
	DefaultSampleRate = 44100
	ErrUnrecognized   = errors.New("nsf: unrecognized format")
)

const (
	NSF_HEADER_LEN = 0x80
	NSF_VERSION    = 0x5
	NSF_SONGS      = 0x6
	NSF_START      = 0x7
	NSF_LOAD       = 0x8
	NSF_INIT       = 0xa
	NSF_PLAY       = 0xc
	NSF_SONG       = 0xe
	NSF_ARTIST     = 0x2e
	NSF_COPYRIGHT  = 0x4e
	NSF_SPEED_NTSC = 0x6e
	NSF_BANKSWITCH = 0x70
	NSF_SPEED_PAL  = 0x78
	NSF_PAL_NTSC   = 0x7a
	NSF_EXTRA      = 0x7b
	NSF_ZERO       = 0x7c
)

func ReadNSF(r io.Reader) (n *NSF, err error) {
	n = New()
	n.b, err = ioutil.ReadAll(r)
	if err != nil {
		return
	}
	if len(n.b) < NSF_HEADER_LEN ||
		string(n.b[0:NSF_VERSION]) != "NESM\u001a" {
		return nil, ErrUnrecognized
	}
	n.Version = n.b[NSF_VERSION]
	n.Songs = n.b[NSF_SONGS]
	n.Start = n.b[NSF_START]
	n.LoadAddr = bLEtoUint16(n.b[NSF_LOAD:])
	n.InitAddr = bLEtoUint16(n.b[NSF_INIT:])
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{'dir': 'git-commits-cleaned', 'id': '687107', 'n_tokens_mistral': 1216, 'n_tokens_neox': 1101, 'n_words': 204}