From c96a687783610fcd00f18736b2228fb1683953b5 Mon Sep 17 00:00:00 2001 From: Mathijs van de Nes Date: Sun, 7 Sep 2014 11:53:43 +0000 Subject: [PATCH] Inital commit, containing crc32 --- .gitignore | 2 + Cargo.toml | 8 ++++ src/bin/cksummer.rs | 20 ++++++++++ src/crc32.rs | 92 +++++++++++++++++++++++++++++++++++++++++++++ src/lib.rs | 3 ++ 5 files changed, 125 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 src/bin/cksummer.rs create mode 100644 src/crc32.rs create mode 100644 src/lib.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..fa8d85ac --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +Cargo.lock +target diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 00000000..e99a5aa5 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,8 @@ +[package] + +name = "zip" +version = "0.0.1" +authors = ["Mathijs van de Nes "] + +[dependencies.flatestream] +git = "https://github.com/mvdnes/flatestream-rs.git" diff --git a/src/bin/cksummer.rs b/src/bin/cksummer.rs new file mode 100644 index 00000000..37f63712 --- /dev/null +++ b/src/bin/cksummer.rs @@ -0,0 +1,20 @@ +extern crate zip; + +fn main() +{ + let stdin = std::io::stdin(); + let mut crc_reader = zip::crc32::Crc32Reader::new(stdin); + + let mut buf = [0u8, ..4096]; + loop + { + match crc_reader.read(&mut buf) + { + Err(_) => break, + _ => {}, + } + } + crc_reader.read_to_end().unwrap(); + + println!("{:x}", crc_reader.get_checksum()); +} diff --git a/src/crc32.rs b/src/crc32.rs new file mode 100644 index 00000000..ccf3fc7f --- /dev/null +++ b/src/crc32.rs @@ -0,0 +1,92 @@ +use std::io; + +static CRC32_TABLE : [u32, ..256] = [ + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, + 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, + 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, + 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, + 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, + 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, + 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, + 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, + 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, + 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, + 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, + 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, + 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, + 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, + 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, + 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +]; + +fn crc32(original: u32, buf: &[u8]) -> u32 +{ + let mut crc = original ^ !0u32; + + for byte in buf.iter() + { + crc = CRC32_TABLE[((crc ^ (*byte as u32)) & 0xFF) as uint] ^ (crc >> 8); + } + + return crc ^ !0u32; +} + +pub struct Crc32Reader +{ + inner: R, + crc: u32, +} + +impl Crc32Reader +{ + pub fn new(inner: R) -> Crc32Reader + { + Crc32Reader + { + inner: inner, + crc: 0, + } + } + + pub fn get_checksum(&self) -> u32 + { + self.crc + } +} + +impl Reader for Crc32Reader +{ + fn read(&mut self, buf: &mut [u8]) -> io::IoResult + { + let count = try!(self.inner.read(buf)); + self.crc = crc32(self.crc, buf.slice_to(count)); + Ok(count) + } +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 00000000..d0c119b7 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,3 @@ +extern crate flatestream; + +pub mod crc32;