cryptutils

crc32: Add crc32 utility

Diffstat

4 files changed, 194 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 817b7b3..5532560 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,3 +16,4 @@ INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/ext/libokv/include)
 LINK_LIBRARIES(libokv.a)
 
 ADD_EXECUTABLE(cksum ${PROJECT_SOURCE_DIR}/src/cksum.c)
+ADD_EXECUTABLE(crc32 ${PROJECT_SOURCE_DIR}/src/crc32.c)
diff --git a/README.md b/README.md
index 0a39dd0..5e08fc4 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ OMKOV cryptutils implements many cryptographic utilities.
 | Utility          | Description                              | Standard |
 | ---------------- | ---------------------------------------- | -------- |
 | cksum            | Write file checksums and sizes           | POSIX    |
+| crc32            | Compute the CRC-32 for a file            |          |
 
 ## Build Instructions
 
diff --git a/man/crc32.1 b/man/crc32.1
new file mode 100644
index 0000000..663de3a
--- /dev/null
+++ b/man/crc32.1
@@ -0,0 +1,36 @@
+.TH CRC32 1 2020-07-25 "OMKOV cryptutils" "General Commands Manual"
+.SH NAME
+crc32 \(em compute the CRC-32 for a file
+.SH SYNOPSYS
+\fBcrc32\fR [\fIfile\fR...]
+.SH DESCRIPTION
+Compute and print a CRC-32 for each input file, as well as the file size in
+bytes.
+.SH OPTIONS
+The following options are supported:
+.TP
+.B --help
+Display help information.
+.TP
+.B --version
+Display version information.
+.SH OPERANDS
+The following operand is supported:
+.TP
+.I file
+A pathname of an input file. If no \fIfile\fR operands are specified, or
+\fIfile\fR is a '\fB-\fR', \fIcrc32\fR will read from standard input.
+.SH EXIT STATUS
+The following exit values will be returned:
+.TP
+\ 0
+All files were processed successfully.
+.TP
+>0
+An error occurred.
+.SH COPYRIGHT
+.nf
+Copyright (C) 2020, Jakob Wakeling
+All rights reserved.
+OMKOV Permissive Licence (https://www.omkov.net/OLPE)
+.fi
diff --git a/src/crc32.c b/src/crc32.c
new file mode 100644
index 0000000..0d5e225
--- /dev/null
+++ b/src/crc32.c
@@ -0,0 +1,155 @@
+// crc32.c, version 1.0.3
+// OMKOV cryptutils crc32
+// Copyright (C) 2020, Jakob Wakeling
+// All rights reserved.
+
+/*
+OMKOV Permissive Licence, version 1.0
+
+Copyright (C) 2020, Jakob Wakeling
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal with
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimers.
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimers in the documentation and/or
+  other materials provided with the distribution.
+* Neither the names of the copyright holders, nor the names of its contributors
+  may be used to endorse or promote products derived from this Software without
+  specific prior written permission.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT
+HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
+*/
+
+#include "optget.h"
+
+#include <error.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define VERSION "1.0.3"
+
+static const uint32_t CRC32[] = {
+	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
+};
+
+static inline int crc32(const char *file);
+
+static void help(void);
+static void version(void);
+
+int main(int ac, char *av[]) { A0 = av[0];
+	lop_t lops[] = {
+		{ "help",    ARG_NUL, 256 },
+		{ "version", ARG_NUL, 257 },
+		{ NULL, 0, 0 }
+	};
+	
+	opt_t opt = OPTGET_INIT; opt.str = ""; opt.lops = lops; int o;
+	while((o = optget(&opt, av, 1)) != -1) switch (o) {
+	case 256: { help(); return 0; }
+	case 257: { version(); return 0; }
+	default: { return 1; }
+	}
+	
+	bool warned = false;
+	
+	if (opt.ind == ac) { crc32(NULL); }
+	else for (char **p = &av[opt.ind]; *p; ++p) if (crc32(*p)) {
+		warn("%s: %s", *p, serr()); warned = true;
+	}
+	
+	return warned;
+}
+
+static inline int crc32(const char *file) {
+	char stdbuf[BUFSIZ * 16]; FILE *fi;
+	register size_t fl = 0; register uint32_t crc = (uint32_t)~0;
+	
+	if (!file || (file[0] == '-' && file[1] == 0)) { fi = stdin; }
+	else if (!(fi = fopen(file, "r"))) { return 1; }
+	
+	for (size_t c; (c = fread(stdbuf, 1, sizeof (stdbuf), fi)); fl += c) {
+		for (register size_t i = 0; i != c; ++i) {
+			crc = (crc >> 8) ^ CRC32[(crc ^ (unsigned int)stdbuf[i]) & 0xFF];
+		}
+	} crc = ~crc;
+	
+	printf("%u %zu", crc, fl);
+	if (file) { printf(" %s", file); } fputc('\n', stdout);
+	
+	if (fi != stdin) { fclose(fi); } return 0;
+}
+
+static void help(void) {
+	puts("crc32 - compute the CRC-32 for a file\n");
+	puts("usage: crc32 [file...]\n");
+	puts("options:");
+	puts("  --help     Display help information");
+	puts("  --version  Display version information");
+	return;
+}
+
+static void version() {
+	puts("OMKOV coreutils crc32, version " VERSION);
+	puts("Copyright (C) 2020, Jakob Wakeling");
+	puts("All rights reserved.");
+	puts("OMKOV Permissive Licence (https://www.omkov.net/OLPE)");
+	return;
+}