index.js ➔ readSync - Code Metrics - Inspection of "Fix some Scrutinizer issues" - Zazama/node-id3 - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#127)

by Jan

created 2022-11-22 09:58 UTC

index.js ➔ readSync F

↳ Parent: index.js

Complexity

Conditions

Size

Total Lines	6
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	4
dl	0
loc	6
rs	0
c	0
b	0
f	0
cc	21

How to fix Complexity

const fs = require('fs')
const ID3Definitions = require("./src/ID3Definitions")
const ID3Frames = require('./src/ID3Frames')
const ID3Util = require('./src/ID3Util')
const zlib = require('zlib')
const { isFunction, isString } = require('./src/util')

/*
**  Used specification: http://id3.org/id3v2.3.0
*/

function writeInBuffer(tags, buffer, fn) {
    buffer = removeTagsFromBuffer(buffer) || buffer
    const completeBuffer = Buffer.concat([tags, buffer])
    if(isFunction(fn)) {
        fn(null, completeBuffer)
        return undefined
    }
    return completeBuffer
}

function writeAsync(tags, filename, fn) {
    try {
        fs.readFile(filename, (error, data) => {
            if(error) {
                fn(error)
                return
            }
            data = removeTagsFromBuffer(data) || data
            const newData = Buffer.concat([tags, data])
            fs.writeFile(filename, newData, 'binary', (error) => {
                fn(error)
            })
        })
    } catch(error) {
        fn(error)
    }
}

function writeSync(tags, filename) {
    try {
        let data = fs.readFileSync(filename)
        data = removeTagsFromBuffer(data) || data
        const newData = Buffer.concat([tags, data])
        fs.writeFileSync(filename, newData, 'binary')
    } catch(error) {
        return error
    }
    return true
}

/**
 * Write passed tags to a file/buffer
 * @param tags - Object containing tags to be written
 * @param filebuffer - Can contain a filepath string or buffer
 * @param fn - (optional) Function for async version
 * @returns {boolean|Buffer|Error}
 */
module.exports.write = function(tags, filebuffer, fn) {
    const completeTags = this.create(tags)

    if(filebuffer instanceof Buffer) {
        return writeInBuffer(completeTags, filebuffer, fn)
    }
    if(isFunction(fn)) {
        return writeAsync(completeTags, filebuffer, fn)
    }
    return writeSync(completeTags, filebuffer)
}

/**
 * Creates a buffer containing the ID3 Tag
 * @param tags - Object containing tags to be written
 * @param fn fn - (optional) Function for async version
 * @returns {Buffer}
 */
module.exports.create = function(tags, fn) {
    const frames = this.createBuffersFromTags(tags)

    //  Calculate ID3 body frames size for the header
    const framesSize = frames.reduce((size, {length}) => size + length, 0)

    //  Create ID3 header
    const header = Buffer.alloc(10)
    header.fill(0)
    header.write("ID3", 0)              //File identifier
    header.writeUInt16BE(0x0300, 3)     //Version 2.3.0  --  03 00
    header.writeUInt16BE(0x0000, 5)     //Flags 00
    ID3Util.encodeSize(framesSize).copy(header, 6)

    const id3Data = [header].concat(frames)

    if(isFunction(fn)) {
        fn(Buffer.concat(id3Data))
        return undefined
    }
    return Buffer.concat(id3Data)
}

/**
 * Returns array of buffers created by tags specified in the tags argument
 * @param tags - Object containing tags to be written
 * @returns {Array}
 */
module.exports.createBuffersFromTags = function(tags) {
    let frames = []
    if(!tags) {
        return frames
    }
    const rawObject = Object.keys(tags).reduce((acc, val) => {
        if(ID3Definitions.FRAME_IDENTIFIERS.v3[val] !== undefined) {
            acc[ID3Definitions.FRAME_IDENTIFIERS.v3[val]] = tags[val]
        } else if(ID3Definitions.FRAME_IDENTIFIERS.v4[val] !== undefined) {
            /**
             * Currently, node-id3 always writes ID3 version 3.
             * However, version 3 and 4 are very similar, and node-id3 can also read version 4 frames.
             * Until version 4 is fully supported, as a workaround, allow writing version 4 frames into a version 3 tag.
             * If a reader does not support a v4 frame, it's (per spec) supposed to skip it, so it should not be a problem.
             */
            acc[ID3Definitions.FRAME_IDENTIFIERS.v4[val]] = tags[val]
        } else {
            acc[val] = tags[val]
        }
        return acc
    }, {})

    Object.keys(rawObject).forEach((specName) => {
        let frame
        // Check if invalid specName
        if(specName.length !== 4) {
            return
        }
        if(ID3Frames[specName] !== undefined) {
            frame = ID3Frames[specName].create(rawObject[specName], 3, this)
        } else if(specName.startsWith('T')) {
            frame = ID3Frames.GENERIC_TEXT.create(specName, rawObject[specName], 3)
        } else if(specName.startsWith('W')) {
            if(ID3Util.getSpecOptions(specName, 3).multiple && rawObject[specName] instanceof Array && rawObject[specName].length > 0) {
                frame = Buffer.alloc(0)
                // deduplicate array
                for(let url of [...new Set(rawObject[specName])]) {
                    frame = Buffer.concat([frame, ID3Frames.GENERIC_URL.create(specName, url, 3)])
                }
            } else {
                frame = ID3Frames.GENERIC_URL.create(specName, rawObject[specName], 3)
            }
        }

        if (frame && frame instanceof Buffer) {
            frames.push(frame)
        }
    })

    return frames
}

function readSync(filebuffer, options) {
    if(isString(filebuffer)) {
        filebuffer = fs.readFileSync(filebuffer)
    }
    return this.getTagsFromBuffer(filebuffer, options)
}

function readAsync(filebuffer, options, fn) {
    if(isString(filebuffer)) {
        fs.readFile(filebuffer, (error, data) => {
            if(error) {
                fn(error, null)
            } else {
                fn(null, this.getTagsFromBuffer(data, options))
            }
        })
    } else {
        fn(null, this.getTagsFromBuffer(filebuffer, options))
    }
}

/**
 * Read ID3-Tags from passed buffer/filepath
 * @param filebuffer - Can contain a filepath string or buffer
 * @param options - (optional) Object containing options
 * @param fn - (optional) Function for async version
 * @returns {boolean}
 */
module.exports.read = function(filebuffer, options, fn) {
    if(!options || typeof options === 'function') {
        fn = fn || options
        options = {}
    }
    if(isFunction(fn)) {
        return readAsync.bind(this)(filebuffer, options, fn)
    }
    return readSync.bind(this)(filebuffer, options)
}

/**
 * Update ID3-Tags from passed buffer/filepath
 * @param tags - Object containing tags to be written
 * @param filebuffer - Can contain a filepath string or buffer
 * @param options - (optional) Object containing options
 * @param fn - (optional) Function for async version
 * @returns {boolean|Buffer|Error}
 */
module.exports.update = function(tags, filebuffer, options, fn) {
    if(!options || typeof options === 'function') {
        fn = fn || options
        options = {}
    }

    const rawTags = Object.keys(tags).reduce((acc, val) => {
        if(ID3Definitions.FRAME_IDENTIFIERS.v3[val] !== undefined) {
            acc[ID3Definitions.FRAME_IDENTIFIERS.v3[val]] = tags[val]
        } else {
            acc[val] = tags[val]
        }
        return acc
    }, {})

    const updateFn = (currentTags) => {
        currentTags = currentTags.raw || {}
        Object.keys(rawTags).map((specName) => {
            const options = ID3Util.getSpecOptions(specName, 3)
            const cCompare = {}
            if(options.multiple && currentTags[specName] && rawTags[specName]) {
                if(options.updateCompareKey) {
                    currentTags[specName].forEach((cTag, index) => {
                        cCompare[cTag[options.updateCompareKey]] = index
                    })

                }
                if (!(rawTags[specName] instanceof Array)) {
                    rawTags[specName] = [rawTags[specName]]
                }
                rawTags[specName].forEach((rTag) => {
                    const comparison = cCompare[rTag[options.updateCompareKey]]
                    if (comparison !== undefined) {
                        currentTags[specName][comparison] = rTag
                    } else {
                        currentTags[specName].push(rTag)
                    }
                })
            } else {
                currentTags[specName] = rawTags[specName]
            }
        })

        return currentTags
    }

    if(!isFunction(fn)) {
        return this.write(updateFn(this.read(filebuffer, options)), filebuffer)
    }

    this.write(updateFn(this.read(filebuffer, options)), filebuffer, fn)
}


module.exports.getTagsFromBuffer = function(filebuffer, options) {
    let framePosition = ID3Util.getFramePosition(filebuffer)
    if(framePosition === -1) {
        return this.getTagsFromFrames([], 3, options)
    }
    const frameSize = ID3Util.decodeSize(filebuffer.slice(framePosition + 6, framePosition + 10)) + 10
    let ID3Frame = Buffer.alloc(frameSize + 1)
    filebuffer.copy(ID3Frame, 0, framePosition)
    //ID3 version e.g. 3 if ID3v2.3.0
    let ID3Version = ID3Frame[3]
    const tagFlags = ID3Util.parseTagHeaderFlags(ID3Frame)
    let extendedHeaderOffset = 0
    if(tagFlags.extendedHeader) {
        if(ID3Version === 3) {
            extendedHeaderOffset = 4 + filebuffer.readUInt32BE(10)
        } else if(ID3Version === 4) {
            extendedHeaderOffset = ID3Util.decodeSize(filebuffer.slice(10, 14))
        }
    }
    let ID3FrameBody = Buffer.alloc(frameSize - 10 - extendedHeaderOffset)
    filebuffer.copy(ID3FrameBody, 0, framePosition + 10 + extendedHeaderOffset)

    let frames = this.getFramesFromID3Body(ID3FrameBody, ID3Version, options)

    return this.getTagsFromFrames(frames, ID3Version, options)
}

module.exports.getFramesFromID3Body = function(ID3FrameBody, ID3Version, options = {}) {
    let currentPosition = 0
    let frames = []
    if(!ID3FrameBody || !(ID3FrameBody instanceof Buffer)) {
        return frames
    }

    let identifierSize = 4
    let textframeHeaderSize = 10
    if(ID3Version === 2) {
        identifierSize = 3
        textframeHeaderSize = 6
    }

    while(currentPosition < ID3FrameBody.length && ID3FrameBody[currentPosition] !== 0x00) {
        let bodyFrameHeader = Buffer.alloc(textframeHeaderSize)
        ID3FrameBody.copy(bodyFrameHeader, 0, currentPosition)

        let decodeSize = false
        if(ID3Version === 4) {
            decodeSize = true
        }
        let bodyFrameSize = ID3Util.getFrameSize(bodyFrameHeader, decodeSize, ID3Version)
        if(bodyFrameSize + 10 > (ID3FrameBody.length - currentPosition)) {
            break
        }
        const specName = bodyFrameHeader.toString('utf8', 0, identifierSize)
        if(options.exclude instanceof Array && options.exclude.includes(specName) || options.include instanceof Array && !options.include.includes(specName)) {
            currentPosition += bodyFrameSize + textframeHeaderSize
            continue
        }
        const frameHeaderFlags = ID3Util.parseFrameHeaderFlags(bodyFrameHeader, ID3Version)
        let bodyFrameBuffer = Buffer.alloc(bodyFrameSize)
        ID3FrameBody.copy(bodyFrameBuffer, 0, currentPosition + textframeHeaderSize + (frameHeaderFlags.dataLengthIndicator ? 4 : 0))
        //  Size of sub frame + its header
        currentPosition += bodyFrameSize + textframeHeaderSize
        frames.push({
            name: specName,
            flags: frameHeaderFlags,
            body: frameHeaderFlags.unsynchronisation ? ID3Util.processUnsynchronisedBuffer(bodyFrameBuffer) : bodyFrameBuffer
        })
    }

    return frames
}

module.exports.getTagsFromFrames = function(frames, ID3Version, options = {}) {
    let tags = { }
    let raw = { }

    frames.forEach((frame) => {
        let specName
        let identifier
        if(ID3Version === 2) {
            specName = ID3Definitions.FRAME_IDENTIFIERS.v3[ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v2[frame.name]]
            identifier = ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v2[frame.name]
        } else if(ID3Version === 3 || ID3Version === 4) {
            /**
             * Due to their similarity, it's possible to mix v3 and v4 frames even if they don't exist in their corrosponding spec.
             * Programs like Mp3tag allow you to do so, so we should allow reading e.g. v4 frames from a v3 ID3 Tag
             */
            specName = frame.name
            identifier = ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v3[frame.name] || ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v4[frame.name]
        }

        if(!specName || !identifier || frame.flags.encryption) {
            return
        }

        if(frame.flags.compression) {
            if(frame.body.length < 5) {
                return
            }
            const inflatedSize = frame.body.readInt32BE()
            /*
            * ID3 spec defines that compression is stored in ZLIB format, but doesn't specify if header is present or not.
            * ZLIB has a 2-byte header.
            * 1. try if header + body decompression
            * 2. else try if header is not stored (assume that all content is deflated "body")
            * 3. else try if inflation works if the header is omitted (implementation dependent)
            * */
            try {
                frame.body = zlib.inflateSync(frame.body.slice(4))
            } catch (e) {
                try {
                    frame.body = zlib.inflateRawSync(frame.body.slice(4))
                } catch (e) {
                    try {
                        frame.body = zlib.inflateRawSync(frame.body.slice(6))
                    } catch (e) {
                        return
                    }
                }
            }
            if(frame.body.length !== inflatedSize) {
                return
            }
        }

        let decoded
        if(ID3Frames[specName]) {
            decoded = ID3Frames[specName].read(frame.body, ID3Version, this)
        } else if(specName.startsWith('T')) {
            decoded = ID3Frames.GENERIC_TEXT.read(frame.body, ID3Version)
        } else if(specName.startsWith('W')) {
            decoded = ID3Frames.GENERIC_URL.read(frame.body, ID3Version)
        }

        if(decoded) {
            if(ID3Util.getSpecOptions(specName, ID3Version).multiple) {
                if(!options.onlyRaw) {
                    if(!tags[identifier]) {
                        tags[identifier] = []
                    }
                    tags[identifier].push(decoded)
                }
                if(!options.noRaw) {
                    if(!raw[specName]) {
                        raw[specName] = []
                    }
                    raw[specName].push(decoded)
                }
            } else {
                if(!options.onlyRaw) {
                    tags[identifier] = decoded
                }
                if(!options.noRaw) {
                    raw[specName] = decoded
                }
            }
        }
    })

    if(options.onlyRaw) {
        return raw
    }
    if(options.noRaw) {
        return tags
    }

    tags.raw = raw
    return tags
}

module.exports.removeTagsFromBuffer = removeTagsFromBuffer

/**
 * Checks and removes already written ID3-Frames from a buffer
 * @param {Buffer} data
 * @returns {boolean|Buffer}
 */
 function removeTagsFromBuffer(data) {
    const framePosition = ID3Util.getFramePosition(data)

    if (framePosition === -1) {
        return data
    }

    const encodedSize = data.slice(framePosition + 6, framePosition + 10)
    if (!ID3Util.isValidEncodedSize(encodedSize)) {
        return false
    }

    if (data.length >= framePosition + 10) {
        const size = ID3Util.decodeSize(encodedSize)
        return Buffer.concat([
            data.slice(0, framePosition),
            data.slice(framePosition + size + 10)
        ])
    }

    return data
}

/**
 * @param {string} filepath - Filepath to file
 * @returns {boolean|Error}
 */
function removeTagsSync(filepath) {
    let data
    try {
        data = fs.readFileSync(filepath)
    } catch(error) {
        return error
    }

    const newData = removeTagsFromBuffer(data)
    if(!newData) {
        return false
    }

    try {
        fs.writeFileSync(filepath, newData, 'binary')
    } catch(error) {
        return error
    }

    return true
}

/**
 * @param {string} filepath - Filepath to file
 * @param {(error: Error) => void} fn - Function for async usage
 * @returns {void}
 */
function removeTagsAsync(filepath, fn) {
    fs.readFile(filepath, (error, data) => {
        if(error) {
            fn(error)
        }

        const newData = removeTagsFromBuffer(data)
        if(!newData) {
            fn(error)
            return
        }

        fs.writeFile(filepath, newData, 'binary', (error) => {
            if(error) {
                fn(error)
            } else {
                fn(false)
            }
        })
    })
}

/**
 * Checks and removes already written ID3-Frames from a file
 * @param {string} filepath - Filepath to file
 * @param fn - (optional) Function for async usage
 * @returns {boolean|Error}
 */
module.exports.removeTags = function(filepath, fn) {
    if(isFunction(fn)) {
        return removeTagsAsync(filepath, fn)
    }
    return removeTagsSync(filepath)
}

function makePromise(fn) {
    return new Promise((resolve, reject) => {
        fn((error, result) => {
            if(error) {
                reject(error)
            } else {
                resolve(result)
            }
        })
    })
}

module.exports.Promise = {
    write: (tags, file) => makePromise(this.write.bind(this, tags, file)),
    update: (tags, file) => makePromise(this.update.bind(this, tags, file)),
    create: (tags) => {
        return new Promise((resolve) => {
            this.create(tags, (buffer) => {
                resolve(buffer)
            })
        })
    },
    read: (file, options) => makePromise(this.read.bind(this, file, options)),
    removeTags: (filepath) => makePromise(this.removeTags.bind(this, filepath))
}

module.exports.Constants = ID3Definitions.Constants


1			const fs = require('fs')
2			const ID3Definitions = require("./src/ID3Definitions")
3			const ID3Frames = require('./src/ID3Frames')
4			const ID3Util = require('./src/ID3Util')
5			const zlib = require('zlib')
6			const { isFunction, isString } = require('./src/util')
7
8			/*
9			** Used specification: http://id3.org/id3v2.3.0
10			*/
11
12			function writeInBuffer(tags, buffer, fn) {
13			buffer = removeTagsFromBuffer(buffer) \|\| buffer
14			const completeBuffer = Buffer.concat([tags, buffer])
15			if(isFunction(fn)) {
16			fn(null, completeBuffer)
17			return undefined
18			}
19			return completeBuffer
20			}
21
22			function writeAsync(tags, filename, fn) {
23			try {
24			fs.readFile(filename, (error, data) => {
25			if(error) {
26			fn(error)
27			return
28			}
29			data = removeTagsFromBuffer(data) \|\| data
30			const newData = Buffer.concat([tags, data])
31			fs.writeFile(filename, newData, 'binary', (error) => {
32			fn(error)
33			})
34			})
35			} catch(error) {
36			fn(error)
37			}
38			}
39
40			function writeSync(tags, filename) {
41			try {
42			let data = fs.readFileSync(filename)
43			data = removeTagsFromBuffer(data) \|\| data
44			const newData = Buffer.concat([tags, data])
45			fs.writeFileSync(filename, newData, 'binary')
46			} catch(error) {
47			return error
48			}
49			return true
50			}
51
52			/**
53			* Write passed tags to a file/buffer
54			* @param tags - Object containing tags to be written
55			* @param filebuffer - Can contain a filepath string or buffer
56			* @param fn - (optional) Function for async version
57			* @returns {boolean\|Buffer\|Error}
58			*/
59			module.exports.write = function(tags, filebuffer, fn) {
60			const completeTags = this.create(tags)
61
62			if(filebuffer instanceof Buffer) {
63			return writeInBuffer(completeTags, filebuffer, fn)
64			}
65			if(isFunction(fn)) {
66			return writeAsync(completeTags, filebuffer, fn)
67			}
68			return writeSync(completeTags, filebuffer)
69			}
70
71			/**
72			* Creates a buffer containing the ID3 Tag
73			* @param tags - Object containing tags to be written
74			* @param fn fn - (optional) Function for async version
75			* @returns {Buffer}
76			*/
77			module.exports.create = function(tags, fn) {
78			const frames = this.createBuffersFromTags(tags)
79
80			// Calculate ID3 body frames size for the header
81			const framesSize = frames.reduce((size, {length}) => size + length, 0)
82
83			// Create ID3 header
84			const header = Buffer.alloc(10)
85			header.fill(0)
86			header.write("ID3", 0) //File identifier
87			header.writeUInt16BE(0x0300, 3) //Version 2.3.0 -- 03 00
88			header.writeUInt16BE(0x0000, 5) //Flags 00
89			ID3Util.encodeSize(framesSize).copy(header, 6)
90
91			const id3Data = [header].concat(frames)
92
93			if(isFunction(fn)) {
94			fn(Buffer.concat(id3Data))
95			return undefined
96			}
97			return Buffer.concat(id3Data)
98			}
99
100			/**
101			* Returns array of buffers created by tags specified in the tags argument
102			* @param tags - Object containing tags to be written
103			* @returns {Array}
104			*/
105			module.exports.createBuffersFromTags = function(tags) {
106			let frames = []
107			if(!tags) {
108			return frames
109			}
110			const rawObject = Object.keys(tags).reduce((acc, val) => {
111			if(ID3Definitions.FRAME_IDENTIFIERS.v3[val] !== undefined) {
112			acc[ID3Definitions.FRAME_IDENTIFIERS.v3[val]] = tags[val]
113			} else if(ID3Definitions.FRAME_IDENTIFIERS.v4[val] !== undefined) {
114			/**
115			* Currently, node-id3 always writes ID3 version 3.
116			* However, version 3 and 4 are very similar, and node-id3 can also read version 4 frames.
117			* Until version 4 is fully supported, as a workaround, allow writing version 4 frames into a version 3 tag.
118			* If a reader does not support a v4 frame, it's (per spec) supposed to skip it, so it should not be a problem.
119			*/
120			acc[ID3Definitions.FRAME_IDENTIFIERS.v4[val]] = tags[val]
121			} else {
122			acc[val] = tags[val]
123			}
124			return acc
125			}, {})
126
127			Object.keys(rawObject).forEach((specName) => {
128			let frame
129			// Check if invalid specName
130			if(specName.length !== 4) {
131			return
132			}
133			if(ID3Frames[specName] !== undefined) {
134			frame = ID3Frames[specName].create(rawObject[specName], 3, this)
135			} else if(specName.startsWith('T')) {
136			frame = ID3Frames.GENERIC_TEXT.create(specName, rawObject[specName], 3)
137			} else if(specName.startsWith('W')) {
138			if(ID3Util.getSpecOptions(specName, 3).multiple && rawObject[specName] instanceof Array && rawObject[specName].length > 0) {
139			frame = Buffer.alloc(0)
140			// deduplicate array
141			for(let url of [...new Set(rawObject[specName])]) {
142			frame = Buffer.concat([frame, ID3Frames.GENERIC_URL.create(specName, url, 3)])
143			}
144			} else {
145			frame = ID3Frames.GENERIC_URL.create(specName, rawObject[specName], 3)
146			}
147			}
148
149			if (frame && frame instanceof Buffer) {
150			frames.push(frame)
151			}
152			})
153
154			return frames
155			}
156
157			function readSync(filebuffer, options) {
158			if(isString(filebuffer)) {
159			filebuffer = fs.readFileSync(filebuffer)
160			}
161			return this.getTagsFromBuffer(filebuffer, options)
162			}
163
164			function readAsync(filebuffer, options, fn) {
165			if(isString(filebuffer)) {
166			fs.readFile(filebuffer, (error, data) => {
167			if(error) {
168			fn(error, null)
169			} else {
170			fn(null, this.getTagsFromBuffer(data, options))
171			}
172			})
173			} else {
174			fn(null, this.getTagsFromBuffer(filebuffer, options))
175			}
176			}
177
178			/**
179			* Read ID3-Tags from passed buffer/filepath
180			* @param filebuffer - Can contain a filepath string or buffer
181			* @param options - (optional) Object containing options
182			* @param fn - (optional) Function for async version
183			* @returns {boolean}
184			*/
185			module.exports.read = function(filebuffer, options, fn) {
186			if(!options \|\| typeof options === 'function') {
187			fn = fn \|\| options
188			options = {}
189			}
190			if(isFunction(fn)) {
191			return readAsync.bind(this)(filebuffer, options, fn)
192			}
193			return readSync.bind(this)(filebuffer, options)
194			}
195
196			/**
197			* Update ID3-Tags from passed buffer/filepath
198			* @param tags - Object containing tags to be written
199			* @param filebuffer - Can contain a filepath string or buffer
200			* @param options - (optional) Object containing options
201			* @param fn - (optional) Function for async version
202			* @returns {boolean\|Buffer\|Error}
203			*/
204			module.exports.update = function(tags, filebuffer, options, fn) {
205			if(!options \|\| typeof options === 'function') {
206			fn = fn \|\| options
207			options = {}
208			}
209
210			const rawTags = Object.keys(tags).reduce((acc, val) => {
211			if(ID3Definitions.FRAME_IDENTIFIERS.v3[val] !== undefined) {
212			acc[ID3Definitions.FRAME_IDENTIFIERS.v3[val]] = tags[val]
213			} else {
214			acc[val] = tags[val]
215			}
216			return acc
217			}, {})
218
219			const updateFn = (currentTags) => {
220			currentTags = currentTags.raw \|\| {}
221			Object.keys(rawTags).map((specName) => {
222			const options = ID3Util.getSpecOptions(specName, 3)
223			const cCompare = {}
224			if(options.multiple && currentTags[specName] && rawTags[specName]) {
225			if(options.updateCompareKey) {
226			currentTags[specName].forEach((cTag, index) => {
227			cCompare[cTag[options.updateCompareKey]] = index
228			})
229
230			}
231			if (!(rawTags[specName] instanceof Array)) {
232			rawTags[specName] = [rawTags[specName]]
233			}
234			rawTags[specName].forEach((rTag) => {
235			const comparison = cCompare[rTag[options.updateCompareKey]]
236			if (comparison !== undefined) {
237			currentTags[specName][comparison] = rTag
238			} else {
239			currentTags[specName].push(rTag)
240			}
241			})
242			} else {
243			currentTags[specName] = rawTags[specName]
244			}
245			})
246
247			return currentTags
248			}
249
250			if(!isFunction(fn)) {
251			return this.write(updateFn(this.read(filebuffer, options)), filebuffer)
252			}
253
254			this.write(updateFn(this.read(filebuffer, options)), filebuffer, fn)
255			}
			0 ignored issues – show Best Practice introduced 2021-03-18 21:25 UTC by Report Bug Copy Issue Report There is no `return` statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding `return undefined;` explicitly. Loading history...
256
257			module.exports.getTagsFromBuffer = function(filebuffer, options) {
258			let framePosition = ID3Util.getFramePosition(filebuffer)
259			if(framePosition === -1) {
260			return this.getTagsFromFrames([], 3, options)
261			}
262			const frameSize = ID3Util.decodeSize(filebuffer.slice(framePosition + 6, framePosition + 10)) + 10
263			let ID3Frame = Buffer.alloc(frameSize + 1)
264			filebuffer.copy(ID3Frame, 0, framePosition)
265			//ID3 version e.g. 3 if ID3v2.3.0
266			let ID3Version = ID3Frame[3]
267			const tagFlags = ID3Util.parseTagHeaderFlags(ID3Frame)
268			let extendedHeaderOffset = 0
269			if(tagFlags.extendedHeader) {
270			if(ID3Version === 3) {
271			extendedHeaderOffset = 4 + filebuffer.readUInt32BE(10)
272			} else if(ID3Version === 4) {
273			extendedHeaderOffset = ID3Util.decodeSize(filebuffer.slice(10, 14))
274			}
275			}
276			let ID3FrameBody = Buffer.alloc(frameSize - 10 - extendedHeaderOffset)
277			filebuffer.copy(ID3FrameBody, 0, framePosition + 10 + extendedHeaderOffset)
278
279			let frames = this.getFramesFromID3Body(ID3FrameBody, ID3Version, options)
280
281			return this.getTagsFromFrames(frames, ID3Version, options)
282			}
283
284			module.exports.getFramesFromID3Body = function(ID3FrameBody, ID3Version, options = {}) {
285			let currentPosition = 0
286			let frames = []
287			if(!ID3FrameBody \|\| !(ID3FrameBody instanceof Buffer)) {
288			return frames
289			}
290
291			let identifierSize = 4
292			let textframeHeaderSize = 10
293			if(ID3Version === 2) {
294			identifierSize = 3
295			textframeHeaderSize = 6
296			}
297
298			while(currentPosition < ID3FrameBody.length && ID3FrameBody[currentPosition] !== 0x00) {
299			let bodyFrameHeader = Buffer.alloc(textframeHeaderSize)
300			ID3FrameBody.copy(bodyFrameHeader, 0, currentPosition)
301
302			let decodeSize = false
303			if(ID3Version === 4) {
304			decodeSize = true
305			}
306			let bodyFrameSize = ID3Util.getFrameSize(bodyFrameHeader, decodeSize, ID3Version)
307			if(bodyFrameSize + 10 > (ID3FrameBody.length - currentPosition)) {
308			break
309			}
310			const specName = bodyFrameHeader.toString('utf8', 0, identifierSize)
311			if(options.exclude instanceof Array && options.exclude.includes(specName) \|\| options.include instanceof Array && !options.include.includes(specName)) {
312			currentPosition += bodyFrameSize + textframeHeaderSize
313			continue
314			}
315			const frameHeaderFlags = ID3Util.parseFrameHeaderFlags(bodyFrameHeader, ID3Version)
316			let bodyFrameBuffer = Buffer.alloc(bodyFrameSize)
317			ID3FrameBody.copy(bodyFrameBuffer, 0, currentPosition + textframeHeaderSize + (frameHeaderFlags.dataLengthIndicator ? 4 : 0))
318			// Size of sub frame + its header
319			currentPosition += bodyFrameSize + textframeHeaderSize
320			frames.push({
321			name: specName,
322			flags: frameHeaderFlags,
323			body: frameHeaderFlags.unsynchronisation ? ID3Util.processUnsynchronisedBuffer(bodyFrameBuffer) : bodyFrameBuffer
324			})
325			}
326
327			return frames
328			}
329
330			module.exports.getTagsFromFrames = function(frames, ID3Version, options = {}) {
331			let tags = { }
332			let raw = { }
333
334			frames.forEach((frame) => {
335			let specName
336			let identifier
337			if(ID3Version === 2) {
338			specName = ID3Definitions.FRAME_IDENTIFIERS.v3[ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v2[frame.name]]
339			identifier = ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v2[frame.name]
340			} else if(ID3Version === 3 \|\| ID3Version === 4) {
341			/**
342			* Due to their similarity, it's possible to mix v3 and v4 frames even if they don't exist in their corrosponding spec.
343			* Programs like Mp3tag allow you to do so, so we should allow reading e.g. v4 frames from a v3 ID3 Tag
344			*/
345			specName = frame.name
346			identifier = ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v3[frame.name] \|\| ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v4[frame.name]
347			}
348
349			if(!specName \|\| !identifier \|\| frame.flags.encryption) {
350			return
351			}
352
353			if(frame.flags.compression) {
354			if(frame.body.length < 5) {
355			return
356			}
357			const inflatedSize = frame.body.readInt32BE()
358			/*
359			* ID3 spec defines that compression is stored in ZLIB format, but doesn't specify if header is present or not.
360			* ZLIB has a 2-byte header.
361			* 1. try if header + body decompression
362			* 2. else try if header is not stored (assume that all content is deflated "body")
363			* 3. else try if inflation works if the header is omitted (implementation dependent)
364			* */
365			try {
366			frame.body = zlib.inflateSync(frame.body.slice(4))
367			} catch (e) {
368			try {
369			frame.body = zlib.inflateRawSync(frame.body.slice(4))
370			} catch (e) {
371			try {
372			frame.body = zlib.inflateRawSync(frame.body.slice(6))
373			} catch (e) {
374			return
375			}
376			}
377			}
378			if(frame.body.length !== inflatedSize) {
379			return
380			}
381			}
382
383			let decoded
384			if(ID3Frames[specName]) {
385			decoded = ID3Frames[specName].read(frame.body, ID3Version, this)
386			} else if(specName.startsWith('T')) {
387			decoded = ID3Frames.GENERIC_TEXT.read(frame.body, ID3Version)
388			} else if(specName.startsWith('W')) {
389			decoded = ID3Frames.GENERIC_URL.read(frame.body, ID3Version)
390			}
391
392			if(decoded) {
393			if(ID3Util.getSpecOptions(specName, ID3Version).multiple) {
394			if(!options.onlyRaw) {
395			if(!tags[identifier]) {
396			tags[identifier] = []
397			}
398			tags[identifier].push(decoded)
399			}
400			if(!options.noRaw) {
401			if(!raw[specName]) {
402			raw[specName] = []
403			}
404			raw[specName].push(decoded)
405			}
406			} else {
407			if(!options.onlyRaw) {
408			tags[identifier] = decoded
409			}
410			if(!options.noRaw) {
411			raw[specName] = decoded
412			}
413			}
414			}
415			})
416
417			if(options.onlyRaw) {
418			return raw
419			}
420			if(options.noRaw) {
421			return tags
422			}
423
424			tags.raw = raw
425			return tags
426			}
427
428			module.exports.removeTagsFromBuffer = removeTagsFromBuffer
429
430			/**
431			* Checks and removes already written ID3-Frames from a buffer
432			* @param {Buffer} data
433			* @returns {boolean\|Buffer}
434			*/
435			function removeTagsFromBuffer(data) {
436			const framePosition = ID3Util.getFramePosition(data)
437
438			if (framePosition === -1) {
439			return data
440			}
441
442			const encodedSize = data.slice(framePosition + 6, framePosition + 10)
443			if (!ID3Util.isValidEncodedSize(encodedSize)) {
444			return false
445			}
446
447			if (data.length >= framePosition + 10) {
448			const size = ID3Util.decodeSize(encodedSize)
449			return Buffer.concat([
450			data.slice(0, framePosition),
451			data.slice(framePosition + size + 10)
452			])
453			}
454
455			return data
456			}
457
458			/**
459			* @param {string} filepath - Filepath to file
460			* @returns {boolean\|Error}
461			*/
462			function removeTagsSync(filepath) {
463			let data
464			try {
465			data = fs.readFileSync(filepath)
466			} catch(error) {
467			return error
468			}
469
470			const newData = removeTagsFromBuffer(data)
471			if(!newData) {
472			return false
473			}
474
475			try {
476			fs.writeFileSync(filepath, newData, 'binary')
477			} catch(error) {
478			return error
479			}
480
481			return true
482			}
483
484			/**
485			* @param {string} filepath - Filepath to file
486			* @param {(error: Error) => void} fn - Function for async usage
487			* @returns {void}
488			*/
489			function removeTagsAsync(filepath, fn) {
490			fs.readFile(filepath, (error, data) => {
491			if(error) {
492			fn(error)
493			}
494
495			const newData = removeTagsFromBuffer(data)
496			if(!newData) {
497			fn(error)
498			return
499			}
500
501			fs.writeFile(filepath, newData, 'binary', (error) => {
502			if(error) {
503			fn(error)
504			} else {
505			fn(false)
506			}
507			})
508			})
509			}
510
511			/**
512			* Checks and removes already written ID3-Frames from a file
513			* @param {string} filepath - Filepath to file
514			* @param fn - (optional) Function for async usage
515			* @returns {boolean\|Error}
516			*/
517			module.exports.removeTags = function(filepath, fn) {
518			if(isFunction(fn)) {
519			return removeTagsAsync(filepath, fn)
520			}
521			return removeTagsSync(filepath)
522			}
523
524			function makePromise(fn) {
525			return new Promise((resolve, reject) => {
526			fn((error, result) => {
527			if(error) {
528			reject(error)
529			} else {
530			resolve(result)
531			}
532			})
533			})
534			}
535
536			module.exports.Promise = {
537			write: (tags, file) => makePromise(this.write.bind(this, tags, file)),
538			update: (tags, file) => makePromise(this.update.bind(this, tags, file)),
539			create: (tags) => {
540			return new Promise((resolve) => {
541			this.create(tags, (buffer) => {
542			resolve(buffer)
543			})
544			})
545			},
546			read: (file, options) => makePromise(this.read.bind(this, file, options)),
547			removeTags: (filepath) => makePromise(this.removeTags.bind(this, filepath))
548			}
549
550			module.exports.Constants = ID3Definitions.Constants
551

Zazama / node-id3

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