Saagar Jha saagarjha
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| { | |
| "internal" => 0 | |
| "name" => "a14" | |
| "system" => { | |
| "cpu" => { | |
| "aliases" => { | |
| "Cycles" => "FIXED_CYCLES" | |
| "Instructions" => "FIXED_INSTRUCTIONS" | |
| } | |
| "architecture" => "arm64" |
saagarjha
/ file_drain.c
Created
November 11, 2023 10:01
"Drain" files while they are processed to reduce free disk space requirements
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| // Sometimes you have a large file on a small disk and would like to "transform" | |
| // it in some way: for example, by decompressing it. However, you might not have | |
| // enough space on disk to keep both the the compressed file and the | |
| // decompressed results. If the process can be done in a streaming fashion, it | |
| // would be nice if the file could be "drained"; that is, the file would be | |
| // sequentially deleted as it is consumed. At the start you'd have 100% of the | |
| // original file, somewhere in the middle you'd have about half of the original | |
| // file and half of your output, and by the end the original file will be gone | |
| // and you'll be left with just the results. If you do it this way, you might | |
| // be able to do the entire operation without extra space! |
saagarjha
/ mmap_vs_read.c
Created
September 29, 2023 10:42
Test whether mmap or read is faster on your computer
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| // As seen on: | |
| // https://federated.saagarjha.com/notice/AaEMQpJBSbxhLyxYzg | |
| // https://twitter.com/_saagarjha/status/1707423903969341949 | |
| // Compiling: gcc mmap_vs_read.c -O3 -o mmap_vs_read | |
| // Usage: ./mmap_vs_read <bigfile> <mmap|read> | |
| #include <fcntl.h> | |
| #include <stddef.h> | |
| #include <stdio.h> |
saagarjha
/ MetadataExtractor.js
Created
February 17, 2023 09:36
Apple's metadata extraction code for link previews in Messages, taken from macOS Ventura 13.3 Beta (22E5219e)
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| // | |
| // LinkPresentation | |
| // Copyright © 2015-2020 Apple Inc. All rights reserved. | |
| // | |
| // FIXME: Twitter equivalents? | |
| (function () { | |
| var MetadataExtractor = { |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| var database; | |
| async function foo() { | |
| let key = await window.crypto.subtle.generateKey( | |
| { | |
| name: "HMAC", |
saagarjha
/ crash_with_message.h
Created
February 7, 2023 08:34
Poor man's replacement for abort_report_np (https://twitter.com/mraleph/status/1622598001855287300)
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| // Usage should be fairly self-explanatory, just paste this in a header and use | |
| // CRASH_WITH_MESSAGE("foobar") in your function. | |
| // Example backtrace: | |
| // Thread 0 Crashed:: Dispatch queue: com.apple.main-thread | |
| // 0 ??? 0x1022d8000 CRASHING IN test.c:20 (foobar) + 0 | |
| // 1 a.out 0x1022d7f60 main + 24 | |
| // 2 dyld 0x195f07e50 start + 2544 | |
| #define STRINGIFY(a) #a | |
| #define CRASH_FUNCTION_NAME(file, line, message) "CRASHING IN " file ":" STRINGIFY(line) " (" message ")" |
saagarjha
/ fix_FB11645580.mm
Last active
January 1, 2024 04:09
Fix an Xcode hang caused by FB11645580 due to IDERunDestination registering thousands of duplicate KVO observers
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| // https://gist.github.com/saagarjha/ed701e3369639410b5d5303612964557 | |
| #import "swizzler.h" | |
| #import <Foundation/Foundation.h> | |
| #import <cstddef> | |
| #import <cstdlib> | |
| #import <dlfcn.h> | |
| #import <mach-o/dyld.h> | |
| #import <mutex> | |
| #import <string> | |
| #import <tuple> |
saagarjha
/ binja_stripped_selector_stub_fixup.py
Last active
October 22, 2023 17:33
Fix up objc_msgSend selector stubs in Binary Ninja
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| for function in filter(lambda f: f.name == "_objc_msgSend", bv.functions): | |
| selector = function.lowest_address + 4 | |
| selector = list(bv.get_code_refs_from(selector))[0] | |
| selector = list(bv.get_data_refs(selector))[0] | |
| selector = list(bv.get_data_refs_from(selector))[0] | |
| selector = bv.get_data_var_at(selector).value | |
| # objc_msgSend itself, probably | |
| if not selector: | |
| continue | |
| selector = selector[:-1].decode() |
saagarjha
/ path_hook.mm
Created
October 17, 2022 18:57
Some code I used to help write FB11698739. Very rough and posted as-is: don't copy things blindly from the internet, but that applies doubly so here!
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| // clang path_hook.mm -shared -ldl -g -framework Foundation path_hook.o -L/usr/lib/swift | |
| #include <cassert> | |
| #include <cstdint> | |
| #include <dlfcn.h> | |
| #include <mach/arm/vm_param.h> | |
| #include <mach/kern_return.h> | |
| #include <mach/mach_init.h> | |
| #include <mach/vm_map.h> | |
| #include <mach/vm_prot.h> |
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| // Generated via | |
| // grep -r -l CFBundleURLSchemes /Volumes/JupiterB19R570.N121bOS/ | xargs -n1 sh -c '/usr/libexec/PlistBuddy -c "Print" "$0" > /dev/null 2>&1 && echo && echo "$0" && /usr/libexec/PlistBuddy -c "Print :CFBundleURLTypes" "$0"' | |
| // -[LSApplicationWorkspace openURL:configuration:completionHandler] is a good way to open these | |
| /Volumes/JupiterB19R570.N121bOS/System/Library/CoreServices/Carousel.app/Info.plist | |
| Array { | |
| Dict { | |
| CFBundleURLName = com.apple.carousel | |
| CFBundleURLSchemes = Array { |
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