1 files changed, 381 insertions, 0 deletions
diff --git a/vendor/png/examples/pngcheck.rs b/vendor/png/examples/pngcheck.rs
new file mode 100644
index 0000000..69e95e3
--- /dev/null
+++ b/vendor/png/examples/pngcheck.rs
@@ -0,0 +1,381 @@
+#![allow(non_upper_case_globals)]
+
+extern crate getopts;
+extern crate glob;
+extern crate png;
+
+use std::env;
+use std::fs::File;
+use std::io;
+use std::io::prelude::*;
+use std::path::Path;
+
+use getopts::{Matches, Options, ParsingStyle};
+use term::{color, Attr};
+
+fn parse_args() -> Matches {
+    let args: Vec<String> = env::args().collect();
+    let mut opts = Options::new();
+    opts.optflag("c", "", "colorize output (for ANSI terminals)")
+        .optflag("q", "", "test quietly (output only errors)")
+        .optflag(
+            "t",
+            "",
+            "print contents of tEXt/zTXt/iTXt chunks (can be used with -q)",
+        )
+        .optflag("v", "", "test verbosely (print most chunk data)")
+        .parsing_style(ParsingStyle::StopAtFirstFree);
+    if args.len() > 1 {
+        match opts.parse(&args[1..]) {
+            Ok(matches) => return matches,
+            Err(err) => println!("{}", err),
+        }
+    }
+    println!("{}", opts.usage("Usage: pngcheck [-cpt] [file ...]"));
+    std::process::exit(0);
+}
+
+#[derive(Clone, Copy)]
+struct Config {
+    quiet: bool,
+    verbose: bool,
+    color: bool,
+    text: bool,
+}
+
+fn display_interlaced(i: bool) -> &'static str {
+    if i {
+        "interlaced"
+    } else {
+        "non-interlaced"
+    }
+}
+
+fn display_image_type(bits: u8, color: png::ColorType) -> String {
+    use png::ColorType::*;
+    format!(
+        "{}-bit {}",
+        bits,
+        match color {
+            Grayscale => "grayscale",
+            Rgb => "RGB",
+            Indexed => "palette",
+            GrayscaleAlpha => "grayscale+alpha",
+            Rgba => "RGB+alpha",
+        }
+    )
+}
+// channels after expansion of tRNS
+fn final_channels(c: png::ColorType, trns: bool) -> u8 {
+    use png::ColorType::*;
+    match c {
+        Grayscale => 1 + u8::from(trns),
+        Rgb => 3,
+        Indexed => 3 + u8::from(trns),
+        GrayscaleAlpha => 2,
+        Rgba => 4,
+    }
+}
+fn check_image<P: AsRef<Path>>(c: Config, fname: P) -> io::Result<()> {
+    // TODO improve performance by resusing allocations from decoder
+    use png::Decoded::*;
+    let mut t = term::stdout()
+        .ok_or_else(|| io::Error::new(io::ErrorKind::Other, "could not open terminal"))?;
+    let data = &mut vec![0; 10 * 1024][..];
+    let mut reader = io::BufReader::new(File::open(&fname)?);
+    let fname = fname.as_ref().to_string_lossy();
+    let n = reader.read(data)?;
+    let mut buf = &data[..n];
+    let mut pos = 0;
+    let mut decoder = png::StreamingDecoder::new();
+    // Image data
+    let mut width = 0;
+    let mut height = 0;
+    let mut color = png::ColorType::Grayscale;
+    let mut bits = 0;
+    let mut trns = false;
+    let mut interlaced = false;
+    let mut compressed_size = 0;
+    let mut n_chunks = 0;
+    let mut have_idat = false;
+    macro_rules! c_ratio(
+        // TODO add palette entries to compressed_size
+        () => ({
+            compressed_size as f32/(
+                height as u64 *
+                (width as u64 * final_channels(color, trns) as u64 * bits as u64 + 7)>>3
+            ) as f32
+        });
+    );
+    let display_error = |err| -> Result<_, io::Error> {
+        let mut t = term::stdout()
+            .ok_or_else(|| io::Error::new(io::ErrorKind::Other, "could not open terminal"))?;
+        if c.verbose {
+            if c.color {
+                print!(": ");
+                t.fg(color::RED)?;
+                writeln!(t, "{}", err)?;
+                t.attr(Attr::Bold)?;
+                write!(t, "ERRORS DETECTED")?;
+                t.reset()?;
+            } else {
+                println!(": {}", err);
+                print!("ERRORS DETECTED")
+            }
+            println!(" in {}", fname);
+        } else {
+            if !c.quiet {
+                if c.color {
+                    t.fg(color::RED)?;
+                    t.attr(Attr::Bold)?;
+                    write!(t, "ERROR")?;
+                    t.reset()?;
+                    write!(t, ": ")?;
+                    t.fg(color::YELLOW)?;
+                    writeln!(t, "{}", fname)?;
+                    t.reset()?;
+                } else {
+                    println!("ERROR: {}", fname)
+                }
+            }
+            print!("{}: ", fname);
+            if c.color {
+                t.fg(color::RED)?;
+                writeln!(t, "{}", err)?;
+                t.reset()?;
+            } else {
+                println!("{}", err);
+            }
+        }
+        Ok(())
+    };
+
+    if c.verbose {
+        print!("File: ");
+        if c.color {
+            t.attr(Attr::Bold)?;
+            write!(t, "{}", fname)?;
+            t.reset()?;
+        } else {
+            print!("{}", fname);
+        }
+        print!(" ({}) bytes", data.len())
+    }
+    loop {
+        if buf.is_empty() {
+            // circumvent borrow checker
+            assert!(!data.is_empty());
+            let n = reader.read(data)?;
+
+            // EOF
+            if n == 0 {
+                println!("ERROR: premature end of file {}", fname);
+                break;
+            }
+            buf = &data[..n];
+        }
+        match decoder.update(buf, &mut Vec::new()) {
+            Ok((_, ImageEnd)) => {
+                if !have_idat {
+                    // This isn't beautiful. But it works.
+                    display_error(png::DecodingError::IoError(io::Error::new(
+                        io::ErrorKind::InvalidData,
+                        "IDAT chunk missing",
+                    )))?;
+                    break;
+                }
+                if !c.verbose && !c.quiet {
+                    if c.color {
+                        t.fg(color::GREEN)?;
+                        t.attr(Attr::Bold)?;
+                        write!(t, "OK")?;
+                        t.reset()?;
+                        write!(t, ": ")?;
+                        t.fg(color::YELLOW)?;
+                        write!(t, "{}", fname)?;
+                        t.reset()?;
+                    } else {
+                        print!("OK: {}", fname)
+                    }
+                    println!(
+                        " ({}x{}, {}{}, {}, {:.1}%)",
+                        width,
+                        height,
+                        display_image_type(bits, color),
+                        (if trns { "+trns" } else { "" }),
+                        display_interlaced(interlaced),
+                        100.0 * (1.0 - c_ratio!())
+                    )
+                } else if !c.quiet {
+                    println!();
+                    if c.color {
+                        t.fg(color::GREEN)?;
+                        t.attr(Attr::Bold)?;
+                        write!(t, "No errors detected ")?;
+                        t.reset()?;
+                    } else {
+                        print!("No errors detected ");
+                    }
+                    println!(
+                        "in {} ({} chunks, {:.1}% compression)",
+                        fname,
+                        n_chunks,
+                        100.0 * (1.0 - c_ratio!()),
+                    )
+                }
+                break;
+            }
+            Ok((n, res)) => {
+                buf = &buf[n..];
+                pos += n;
+                match res {
+                    Header(w, h, b, c, i) => {
+                        width = w;
+                        height = h;
+                        bits = b as u8;
+                        color = c;
+                        interlaced = i;
+                    }
+                    ChunkBegin(len, type_str) => {
+                        use png::chunk;
+                        n_chunks += 1;
+                        if c.verbose {
+                            let chunk = type_str;
+                            println!();
+                            print!("  chunk ");
+                            if c.color {
+                                t.fg(color::YELLOW)?;
+                                write!(t, "{:?}", chunk)?;
+                                t.reset()?;
+                            } else {
+                                print!("{:?}", chunk)
+                            }
+                            print!(
+                                " at offset {:#07x}, length {}",
+                                pos - 4, // substract chunk name length
+                                len
+                            )
+                        }
+                        match type_str {
+                            chunk::IDAT => {
+                                have_idat = true;
+                                compressed_size += len
+                            }
+                            chunk::tRNS => {
+                                trns = true;
+                            }
+                            _ => (),
+                        }
+                    }
+                    ImageData => {
+                        //println!("got {} bytes of image data", data.len())
+                    }
+                    ChunkComplete(_, type_str) if c.verbose => {
+                        use png::chunk::*;
+                        if type_str == IHDR {
+                            println!();
+                            print!(
+                                "    {} x {} image, {}{}, {}",
+                                width,
+                                height,
+                                display_image_type(bits, color),
+                                (if trns { "+trns" } else { "" }),
+                                display_interlaced(interlaced),
+                            );
+                        }
+                    }
+                    AnimationControl(actl) => {
+                        println!();
+                        print!("    {} frames, {} plays", actl.num_frames, actl.num_plays,);
+                    }
+                    FrameControl(fctl) => {
+                        println!();
+                        println!(
+                            "    sequence #{}, {} x {} pixels @ ({}, {})",
+                            fctl.sequence_number,
+                            fctl.width,
+                            fctl.height,
+                            fctl.x_offset,
+                            fctl.y_offset,
+                            /*fctl.delay_num,
+                            fctl.delay_den,
+                            fctl.dispose_op,
+                            fctl.blend_op,*/
+                        );
+                        print!(
+                            "    {}/{} s delay, dispose: {}, blend: {}",
+                            fctl.delay_num,
+                            if fctl.delay_den == 0 {
+                                100
+                            } else {
+                                fctl.delay_den
+                            },
+                            fctl.dispose_op,
+                            fctl.blend_op,
+                        );
+                    }
+                    _ => (),
+                }
+                //println!("{} {:?}", n, res)
+            }
+            Err(err) => {
+                let _ = display_error(err);
+                break;
+            }
+        }
+    }
+    if c.text {
+        println!("Parsed tEXt chunks:");
+        for text_chunk in &decoder.info().unwrap().uncompressed_latin1_text {
+            println!("{:#?}", text_chunk);
+        }
+
+        println!("Parsed zTXt chunks:");
+        for text_chunk in &decoder.info().unwrap().compressed_latin1_text {
+            let mut cloned_text_chunk = text_chunk.clone();
+            cloned_text_chunk.decompress_text()?;
+            println!("{:#?}", cloned_text_chunk);
+        }
+
+        println!("Parsed iTXt chunks:");
+        for text_chunk in &decoder.info().unwrap().utf8_text {
+            let mut cloned_text_chunk = text_chunk.clone();
+            cloned_text_chunk.decompress_text()?;
+            println!("{:#?}", cloned_text_chunk);
+        }
+    }
+
+    Ok(())
+}
+
+fn main() {
+    let m = parse_args();
+
+    let config = Config {
+        quiet: m.opt_present("q"),
+        verbose: m.opt_present("v"),
+        color: m.opt_present("c"),
+        text: m.opt_present("t"),
+    };
+
+    for file in m.free {
+        let result = if file.contains('*') {
+            glob::glob(&file)
+                .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
+                .and_then(|mut glob| {
+                    glob.try_for_each(|entry| {
+                        entry
+                            .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
+                            .and_then(|file| check_image(config, file))
+                    })
+                })
+        } else {
+            check_image(config, &file)
+        };
+
+        result.unwrap_or_else(|err| {
+            println!("{}: {}", file, err);
+            std::process::exit(1)
+        });
+    }
+}