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|
use std::ops::Range;
use gifed::{
block::{
Block::{self},
CompressedImage,
},
reader::Decoder,
};
use owo_colors::OwoColorize;
fn main() {
let file = if let Some(file) = std::env::args().skip(1).next() {
file
} else {
println!("usage: gifprobe file.gif");
return;
};
let expand = match std::env::args().nth(2).as_deref() {
Some("expand") => true,
None => false,
Some(str) => {
eprintln!("{str} is not recognised. Did you mean 'expand'?");
return;
}
};
let decoder = Decoder::file(&file).unwrap();
let mut reader = decoder.read().unwrap();
println!("Version {}", reader.version.yellow());
println!(
"Logical Screen Descriptor\n\tDimensions {}x{}",
reader.screen_descriptor.width.yellow(),
reader.screen_descriptor.height.yellow()
);
if reader.screen_descriptor.has_color_table() {
println!(
"\tGlobal Color Table Present {}\n\tGlobal Color Table Size {}",
"Yes".green(),
reader.screen_descriptor.color_table_len().green()
);
} else {
println!(
"\tGlobal Color Table Present {}\n\tGlobal Color Table Size {}",
"No".red(),
reader.screen_descriptor.color_table_len().red()
);
}
let mut img_count = 0;
let mut hundreths: usize = 0;
loop {
let block = match reader.block() {
Ok(Some(block)) => block,
Ok(None) => break,
Err(e) => {
eprintln!("error reading file: {e}");
std::process::exit(-1);
}
};
let offset = block.offset;
let block = block.block;
match block {
Block::CompressedImage(img) => {
describe_image(&img, offset);
img_count += 1;
}
Block::GraphicControlExtension(gce) => {
hundreths += gce.delay() as usize;
let dispose_string = if let Some(dispose) = gce.disposal_method() {
dispose.to_string()
} else {
format!("Reserved: {:b}", gce.packed().disposal_method())
};
print!("Graphic Control Extension");
print_offset(offset);
println!(
"\tDelay Time {}\n\tDispose {}",
format!("{}s", gce.delay() as f32 / 100.0).yellow(),
dispose_string.yellow()
)
}
Block::LoopingExtension(_) => todo!(),
Block::CommentExtension(cmt) => {
print!("Comment Extension");
print_offset(offset);
println!("\tLength {}", cmt.len().yellow());
match String::from_utf8(cmt.clone()) {
Ok(cmt) => println!("\tString \"{}\"", cmt.yellow()),
Err(_) => {
if !expand {
println!("\tString {}", "Content is not utf8".red())
} else {
let lossy = String::from_utf8_lossy(&cmt);
if lossy.len() > 0 {
println!("\tString (lossy) \"{}\"", lossy.yellow())
} else {
println!(
"\tString (lossy) \"{}\"",
"Could not parse as UTF8 Lossy".red()
);
}
}
}
}
}
Block::ApplicationExtension(app) => {
let auth = app.authentication_code();
let app_ident = String::from_utf8_lossy(app.identifier());
print!("Application Extension");
print_offset(offset);
println!(
"\tIdentifier {}\n\tAuthentication {:02X} {:02X} {:02X}",
app_ident.yellow(),
auth[0].yellow(),
auth[1].yellow(),
auth[2].yellow()
);
if app_ident == "NETSCAPE" {
let data = app.data();
let looping = u16::from_le_bytes([data[0], data[1]]);
if looping == 0 {
println!("\tLoop {}", "forever".yellow())
} else {
println!("\tLoop {}", looping.yellow());
}
} else {
let data = app.data();
match String::from_utf8(data.to_vec()) {
Ok(s) => {
println!(
"\tData {}",
format!("Valid UTF-8, {} bytes", s.len()).yellow()
);
if expand {
println!("\tString \"{}\"", s.yellow());
}
}
Err(_e) => println!(
"\tData {}",
format!("Invalid UTF-8, {} bytes", data.len()).yellow()
),
}
}
}
}
}
println!(
"{} is {}.{}s long and has {} frames",
file,
hundreths / 100,
hundreths % 100,
img_count
);
}
fn describe_image(bli: &CompressedImage, offset: Range<usize>) {
print!("Image");
print_offset(offset);
println!(
"\tOffset {}x{}\n\tDimensions {}x{}",
bli.image_descriptor.left.yellow(),
bli.image_descriptor.top.yellow(),
bli.image_descriptor.width.yellow(),
bli.image_descriptor.height.yellow(),
);
if bli.image_descriptor.has_color_table() {
println!(
"\tLocal Color Table Present {}\n\tLocal Color Table Size {}",
"Yes".green(),
bli.image_descriptor.color_table_size().green()
);
} else {
println!(
"\tLocal Color Table Present {}\n\tLocal Color Table Size {}",
"No".red(),
bli.image_descriptor.color_table_size().red()
);
}
}
fn print_offset(offset: Range<usize>) {
print!(" [");
print_usize(offset.start);
print!(" … ");
print_usize(offset.end);
println!("] ");
}
fn print_usize(offset: usize) {
let bytes = offset.to_le_bytes();
let mut seen_nonzero = false;
for byte in bytes {
if byte == 0 {
if seen_nonzero {
break;
}
} else {
seen_nonzero = true;
}
print!("{:02X}", byte.cyan());
}
}
|
