limage - xcf/skip.go

     1  package xcf
     2  
     3  func (r *reader) Skip(n uint32) {
     4  	r.rs.pos += int64(n)
     5  }
     6  
     7  func (r *reader) SkipBoolProperty() {
     8  	r.Skip(4)
     9  }
    10  
    11  func (r *reader) SkipByte() {
    12  	r.Skip(1)
    13  }
    14  
    15  func (r *reader) SkipUint32() {
    16  	r.Skip(4)
    17  }
    18  
    19  func (r *reader) SkipFloat32() {
    20  	r.Skip(4)
    21  }
    22  
    23  func (r *reader) SkipString() {
    24  	r.Skip(r.ReadUint32())
    25  }
    26  
    27  func (r *reader) SkipParasites(l uint32) {
    28  	r.Skip(l)
    29  }
    30  
    31  func (r *reader) SkipParasite() {
    32  	r.SkipString()         // name
    33  	r.SkipUint32()         // flags
    34  	r.Skip(r.ReadUint32()) // data[length]
    35  }
    36  
    37  func (r *reader) SkipPaths() {
    38  	r.SkipUint32() // aIndex
    39  	n := r.ReadUint32()
    40  	for i := uint32(0); i < n; i++ {
    41  		r.SkipString()       // name
    42  		r.SkipBoolProperty() // linked
    43  		r.SkipByte()         // state
    44  		r.SkipBoolProperty() // closed
    45  		np := r.ReadUint32()
    46  		switch r.ReadUint32() { // version
    47  		case 1:
    48  		case 2:
    49  			r.SkipUint32()
    50  		case 3:
    51  			r.SkipUint32()
    52  			r.SkipUint32() // tattoo
    53  		default:
    54  			r.SetError(ErrUnknownPathsVersion)
    55  			return
    56  		}
    57  		r.Skip(12 * np) // (control[4] + x[4] + y[4]) * np
    58  	}
    59  }
    60  
    61  func (r *reader) SkipVectors() {
    62  	if r.ReadUint32() != 1 { // version
    63  		r.SetError(ErrUnknownVectorVersion)
    64  		return
    65  	}
    66  	r.SkipUint32() // aIndex
    67  	n := r.ReadUint32()
    68  	for i := uint32(0); i < n; i++ {
    69  		r.SkipString()       // name
    70  		r.SkipUint32()       // tattoo
    71  		r.SkipBoolProperty() // visible
    72  		r.SkipBoolProperty() // linked
    73  		m := r.ReadUint32()
    74  		k := r.ReadUint32()
    75  		for j := uint32(0); j < m; j++ {
    76  			r.SkipParasite()
    77  		}
    78  		for j := uint32(0); j < k; j++ {
    79  			if r.ReadUint32() != 1 { // stroke type
    80  				r.SetError(ErrUnknownStrokeType)
    81  				return
    82  			}
    83  			r.SkipBoolProperty() // closed
    84  			nf := r.ReadUint32()
    85  			np := r.ReadUint32()
    86  			switch nf {
    87  			case 2, 3, 4, 5, 6:
    88  				/*
    89  					2: Bool + Float32 + Float32 = 5
    90  					3: +Float32 = 9
    91  					4: +Float32 = 13
    92  					5: +Float32 = 17
    93  					6: +Float32 = 21
    94  				*/
    95  				r.Skip(np * (nf*4 + 1))
    96  			default:
    97  				r.SetError(ErrInvalidFloatsNumber)
    98  				return
    99  			}
   100  		}
   101  	}
   102  }
   103