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font/sfnt: fix argStack size check for moveto ops.

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The *moveto ops don't take multiple args or arg pairs. For example, in
http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/font/pdfs/5177.Type2.pdf
page 16, the rmoveto args are listed as:
dx1 dy1
which is not the same as rlineto's args, which can be repeated:
{dxa dya}+

Change-Id: I5d13f686e604955909eb0b7e52f20ce5f0522c5d
Reviewed-on: https://go-review.googlesource.com/38289
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Nigel Tao 2017-03-23 14:12:53 +11:00
parent f03a046406
commit ecc1a9abb6
1 changed files with 7 additions and 13 deletions
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20
font/sfnt/postscript.go
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@ -875,37 +875,31 @@ func t2CAppendCubeto(p *psInterpreter, dxa, dya, dxb, dyb, dxc, dyc int32) {
func t2CHmoveto(p *psInterpreter) error {
t2CReadWidth(p, 1)
if p.argStack.top < 1 {
if p.argStack.top != 1 {
return errInvalidCFFTable
}
for i := int32(0); i < p.argStack.top; i++ {
p.type2Charstrings.x += p.argStack.a[i]
}
p.type2Charstrings.x += p.argStack.a[0]
t2CAppendMoveto(p)
return nil
}
func t2CVmoveto(p *psInterpreter) error {
t2CReadWidth(p, 1)
if p.argStack.top < 1 {
if p.argStack.top != 1 {
return errInvalidCFFTable
}
for i := int32(0); i < p.argStack.top; i++ {
p.type2Charstrings.y += p.argStack.a[i]
}
p.type2Charstrings.y += p.argStack.a[0]
t2CAppendMoveto(p)
return nil
}
func t2CRmoveto(p *psInterpreter) error {
t2CReadWidth(p, 2)
if p.argStack.top < 2 || p.argStack.top%2 != 0 {
if p.argStack.top != 2 {
return errInvalidCFFTable
}
for i := int32(0); i < p.argStack.top; i += 2 {
p.type2Charstrings.x += p.argStack.a[i+0]
p.type2Charstrings.y += p.argStack.a[i+1]
}
p.type2Charstrings.x += p.argStack.a[0]
p.type2Charstrings.y += p.argStack.a[1]
t2CAppendMoveto(p)
return nil
}