Crashes on CGContextDrawPDFPage( ctx, page1 );

[IamAliSufyan]

Hi!

Firstly, Thanks for this amazing library! On iOS 8 app crahes on CGContextDrawPDFPage( ctx, page1 ); when i try to load Pdf into Image. I have tried different pdf files.

Please help!

[mindbrix]

Hi Azkaar. Thanks for the report. Can you give me a an Xcode backtrace?

[mindbrix]

Hi Azkaar. I've made some code updates. Does it still crash?

[IamAliSufyan]

Hi @mindbrix . Sorry for late reply, I was away. Unfortunately fix didn't work for me. Attached an Xcode backtrace. Please, look into this. Thanks!

[mindbrix]

Hi @AzkaarAli, thanks for the back trace. The crash is in the Core Graphics PDF font loading code. Does the PDF render using Quick Look? Where did the PDF come from?

[flybrotherlixiang]

same crash on CGContextDrawPDFPage( ctx, page1 );

[oks]

Same crash for me,

(lldb) po ctx
<CGContext 0x17016fd80>

(lldb) po page1
error: Couldn't materialize: couldn't get the value of variable page1: read memory from 0x38 failed (0 of 8 bytes read)
Errored out in Execute, couldn't PrepareToExecuteJITExpression
Printing description of mediaRect:
(CGRect) mediaRect = (origin = (x = <read memory from 0x18 failed (0 of 8 bytes read)>, y = <read memory from 0x20 failed (0 of 8 bytes read)>), size = (width = <read memory from 0x28 failed (0 of 8 bytes read)>, height = <read memory from 0x30 failed (0 of 8 bytes read)>))
Message from debugger: failed to send the k packet

This happens in very strange situations. Everything works okay, while I didn't reinstall app, after reinstall - ONLY this pdf file become corrupted.

pdf file - http://s.oks.im//newsfeed-btn.pdf

backtrace:

* thread #1: tid = 0xd07f, 0x0000000195ac13f0 libc++abi.dylib`__cxa_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000195ac13f0 libc++abi.dylib`__cxa_throw
    frame #1: 0x000000018d0bcd40 libFontParser.dylib`TcmapEncodingTable::GetSubtable(unsigned short, unsigned short, unsigned short, unsigned short*) + 544
    frame #2: 0x000000018d0cef00 libFontParser.dylib`TcmapEncodingTable::TcmapEncodingTable(TSFNTFont const&, unsigned short, unsigned short, unsigned short) + 116
    frame #3: 0x000000018d0e8170 libFontParser.dylib`FPFontGetTrueTypeEncoding + 144
    frame #4: 0x0000000184e9dce4 libCGXType.A.dylib`get_truetype_encoding + 72
    frame #5: 0x0000000184d4eff8 CoreGraphics`CGFontGetTrueTypeEncoding + 28
    frame #6: 0x0000000184d79b98 CoreGraphics`lookup_glyphs_by_cmap_nonsymbolic + 224
    frame #7: 0x0000000184d79970 CoreGraphics`lookup_glyphs_by_cmap + 104
    frame #8: 0x0000000184d78fac CoreGraphics`get_truetype_glyph_vector + 260
    frame #9: 0x0000000184d78d70 CoreGraphics`CGPDFEncodingGetGlyphVector + 160
    frame #10: 0x0000000184e01bb0 CoreGraphics`simple_draw + 156
    frame #11: 0x0000000184e01920 CoreGraphics`CGPDFTextLayoutDrawGlyphs + 112
    frame #12: 0x0000000184dff7c4 CoreGraphics`op_Tj + 72
    frame #13: 0x0000000184d77364 CoreGraphics`pdf_scanner_handle_xname + 116
    frame #14: 0x0000000184d76bd0 CoreGraphics`CGPDFScannerScan + 272
    frame #15: 0x0000000184df9754 CoreGraphics`CGPDFDrawingContextDrawPage + 440
    frame #16: 0x0000000184dfd328 CoreGraphics`pdf_page_draw_in_context + 108
    frame #17: 0x0000000184d5c6b4 CoreGraphics`CGContextDrawPDFPage + 48
  * frame #18: 0x000000010015fa68 ShipMate`+[PDFView renderIntoContext:url:data:size:page:](self=0x0000000100bdf160, _cmd=0x000000010094ef85, ctx=0x000000017417e540, resourceURL=0x00000001704b1100, resourceData=0x0000000000000000, size=(width = 302, height = 53), page=1) + 288 at PDFView.m:167
    frame #19: 0x000000010034fd9c ShipMate`+[UIImage(self=0x0000000197bc26c0, _cmd=0x00000001009604e2, URL=0x00000001704b1100, size=(width = 302, height = 53), page=1) imageWithPDFURL:atSize:atPage:] + 888 at UIImage+PDF.m:315
    frame #20: 0x000000010035049c ShipMate`+[UIImage(self=0x0000000197bc26c0, _cmd=0x0000000100960552, URL=0x00000001704b1100, height=53, page=1) imageWithPDFURL:atHeight:atPage:] + 248 at UIImage+PDF.m:397
    frame #21: 0x0000000100350534 ShipMate`+[UIImage(self=0x0000000197bc26c0, _cmd=0x0000000100960573, URL=0x00000001704b1100, height=53) imageWithPDFURL:atHeight:] + 104 at UIImage+PDF.m:402
    frame #22: 0x000000010034eb28 ShipMate`+[UIImage(self=0x0000000197bc26c0, _cmd=0x0000000100942922, resourceName=0x0000000100a454f0, height=53) imageWithPDFNamed:atHeight:] + 136 at UIImage+PDF.m:155
    frame #23: 0x0000000100280b24 ShipMate`-[HomePageViewController viewDidLoad](self=0x00000001375a3c00, _cmd=0x0000000189cf4be0) + 5780 at HomePageViewController.m:421
    frame #24: 0x00000001894ecc84 UIKit`-[UIViewController loadViewIfRequired] + 692
    frame #25: 0x00000001895a2f68 UIKit`-[UINavigationController _layoutViewController:] + 64
    frame #26: 0x00000001895a2e64 UIKit`-[UINavigationController _updateScrollViewFromViewController:toViewController:] + 248
    frame #27: 0x00000001895a22f0 UIKit`-[UINavigationController _startTransition:fromViewController:toViewController:] + 112
    frame #28: 0x00000001895a1f9c UIKit`-[UINavigationController _startDeferredTransitionIfNeeded:] + 640
    frame #29: 0x00000001895a1cbc UIKit`-[UINavigationController __viewWillLayoutSubviews] + 56
    frame #30: 0x00000001895a1c3c UIKit`-[UILayoutContainerView layoutSubviews] + 200
    frame #31: 0x00000001894e9760 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 580
    frame #32: 0x0000000188e31e1c QuartzCore`-[CALayer layoutSublayers] + 152
    frame #33: 0x0000000188e2c884 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 320
    frame #34: 0x0000000188e2c728 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
    frame #35: 0x0000000188e2bebc QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 276
    frame #36: 0x0000000188e2bc3c QuartzCore`CA::Transaction::commit() + 528
    frame #37: 0x0000000189778838 UIKit`-[UIApplication _reportMainSceneUpdateFinished:] + 60
    frame #38: 0x000000018977971c UIKit`-[UIApplication _runWithMainScene:transitionContext:completion:] + 2804
    frame #39: 0x0000000189777778 UIKit`-[UIApplication workspaceDidEndTransaction:] + 184
    frame #40: 0x000000018d2b53c8 FrontBoardServices`__31-[FBSSerialQueue performAsync:]_block_invoke_2 + 32
    frame #41: 0x0000000184a6427c CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
    frame #42: 0x0000000184a63384 CoreFoundation`__CFRunLoopDoBlocks + 312
    frame #43: 0x0000000184a619a8 CoreFoundation`__CFRunLoopRun + 1756
    frame #44: 0x000000018498d2d4 CoreFoundation`CFRunLoopRunSpecific + 396
    frame #45: 0x000000018955843c UIKit`-[UIApplication _run] + 552
    frame #46: 0x0000000189552fac UIKit`UIApplicationMain + 1488
    frame #47: 0x000000010013acd8 ShipMate`main(argc=1, argv=0x000000016fdd79d8) + 124 at main.m:15
    frame #48: 0x0000000196956a08 libdyld.dylib`start + 4

[mindbrix]

Hi. It's crashing when looking up the font glyphs to render. Does it crash in the same place each time?

[oks]

yep, same place, same time :)

[brokenteam]

+1

[mindbrix]

The crashes are deep in CG PDF code, so I would recommend filing a Radar with Apple with a sample project that reproduces the issue.

[mindbrix]

It could be a PDF file format issue. Try running the PDF through ShrinkIt: https://panic.com/blog/shrinkit-1-0/ to see if that helps.