diff options
Diffstat (limited to 'src/libutil')
| -rw-r--r-- | src/libutil/Makefile.am | 14 | ||||
| -rw-r--r-- | src/libutil/archive.cc | 334 | ||||
| -rw-r--r-- | src/libutil/archive.hh | 60 | ||||
| -rw-r--r-- | src/libutil/aterm.cc | 93 | ||||
| -rw-r--r-- | src/libutil/aterm.hh | 77 | ||||
| -rw-r--r-- | src/libutil/hash.cc | 124 | ||||
| -rw-r--r-- | src/libutil/hash.hh | 51 | ||||
| -rw-r--r-- | src/libutil/md5.c | 448 | ||||
| -rw-r--r-- | src/libutil/md5.h | 151 | ||||
| -rw-r--r-- | src/libutil/test-aterm.cc | 66 | ||||
| -rw-r--r-- | src/libutil/util.cc | 318 | ||||
| -rw-r--r-- | src/libutil/util.hh | 168 |
12 files changed, 1904 insertions, 0 deletions
diff --git a/src/libutil/Makefile.am b/src/libutil/Makefile.am new file mode 100644 index 000000000..46f0a048f --- /dev/null +++ b/src/libutil/Makefile.am @@ -0,0 +1,14 @@ +noinst_LIBRARIES = libutil.a + +libutil_a_SOURCES = util.cc hash.cc archive.cc md5.c aterm.cc + +AM_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall -I.. -I../../externals/inst/include + +EXTRA_DIST = *.hh *.h + +check_PROGRAMS = test-aterm + +test_aterm_SOURCES = test-aterm.cc +test_aterm_LDADD = libnix.a $(LDADD) ../boost/format/libformat.a \ + -L../../externals/inst/lib -ldb_cxx -lATerm + diff --git a/src/libutil/archive.cc b/src/libutil/archive.cc new file mode 100644 index 000000000..ed57df4c9 --- /dev/null +++ b/src/libutil/archive.cc @@ -0,0 +1,334 @@ +#include <cerrno> +#include <algorithm> +#include <vector> + +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <dirent.h> +#include <fcntl.h> + +#include "archive.hh" +#include "util.hh" + + +static string archiveVersion1 = "nix-archive-1"; + + +static void writePadding(unsigned int len, DumpSink & sink) +{ + if (len % 8) { + unsigned char zero[8]; + memset(zero, 0, sizeof(zero)); + sink(zero, 8 - (len % 8)); + } +} + + +static void writeInt(unsigned int n, DumpSink & sink) +{ + unsigned char buf[8]; + memset(buf, 0, sizeof(buf)); + buf[0] = n & 0xff; + buf[1] = (n >> 8) & 0xff; + buf[2] = (n >> 16) & 0xff; + buf[3] = (n >> 24) & 0xff; + sink(buf, sizeof(buf)); +} + + +static void writeString(const string & s, DumpSink & sink) +{ + unsigned int len = s.length(); + writeInt(len, sink); + sink((const unsigned char *) s.c_str(), len); + writePadding(len, sink); +} + + +static void dump(const string & path, DumpSink & sink); + + +static void dumpEntries(const Path & path, DumpSink & sink) +{ + AutoCloseDir dir = opendir(path.c_str()); + if (!dir) throw SysError("opening directory " + path); + + vector<string> names; + + struct dirent * dirent; + while (errno = 0, dirent = readdir(dir)) { + string name = dirent->d_name; + if (name == "." || name == "..") continue; + names.push_back(name); + } + if (errno) throw SysError("reading directory " + path); + + sort(names.begin(), names.end()); + + for (vector<string>::iterator it = names.begin(); + it != names.end(); it++) + { + writeString("entry", sink); + writeString("(", sink); + writeString("name", sink); + writeString(*it, sink); + writeString("node", sink); + dump(path + "/" + *it, sink); + writeString(")", sink); + } +} + + +static void dumpContents(const Path & path, unsigned int size, + DumpSink & sink) +{ + writeString("contents", sink); + writeInt(size, sink); + + AutoCloseFD fd = open(path.c_str(), O_RDONLY); + if (fd == -1) throw SysError(format("opening file `%1%'") % path); + + unsigned char buf[65536]; + + unsigned int total = 0; + ssize_t n; + while ((n = read(fd, buf, sizeof(buf)))) { + if (n == -1) throw SysError("reading file " + path); + total += n; + sink(buf, n); + } + + if (total != size) + throw SysError("file changed while reading it: " + path); + + writePadding(size, sink); +} + + +static void dump(const Path & path, DumpSink & sink) +{ + struct stat st; + if (lstat(path.c_str(), &st)) + throw SysError(format("getting attributes of path `%1%'") % path); + + writeString("(", sink); + + if (S_ISREG(st.st_mode)) { + writeString("type", sink); + writeString("regular", sink); + if (st.st_mode & S_IXUSR) { + writeString("executable", sink); + writeString("", sink); + } + dumpContents(path, st.st_size, sink); + } + + else if (S_ISDIR(st.st_mode)) { + writeString("type", sink); + writeString("directory", sink); + dumpEntries(path, sink); + } + + else if (S_ISLNK(st.st_mode)) { + writeString("type", sink); + writeString("symlink", sink); + char buf[st.st_size]; + if (readlink(path.c_str(), buf, st.st_size) != st.st_size) + throw SysError("reading symbolic link " + path); + writeString("target", sink); + writeString(string(buf, st.st_size), sink); + } + + else throw Error("unknown file type: " + path); + + writeString(")", sink); +} + + +void dumpPath(const Path & path, DumpSink & sink) +{ + writeString(archiveVersion1, sink); + dump(path, sink); +} + + +static Error badArchive(string s) +{ + return Error("bad archive: " + s); +} + + +static void readPadding(unsigned int len, RestoreSource & source) +{ + if (len % 8) { + unsigned char zero[8]; + unsigned int n = 8 - (len % 8); + source(zero, n); + for (unsigned int i = 0; i < n; i++) + if (zero[i]) throw badArchive("non-zero padding"); + } +} + +static unsigned int readInt(RestoreSource & source) +{ + unsigned char buf[8]; + source(buf, sizeof(buf)); + if (buf[4] || buf[5] || buf[6] || buf[7]) + throw Error("implementation cannot deal with > 32-bit integers"); + return + buf[0] | + (buf[1] << 8) | + (buf[2] << 16) | + (buf[3] << 24); +} + + +static string readString(RestoreSource & source) +{ + unsigned int len = readInt(source); + char buf[len]; + source((unsigned char *) buf, len); + readPadding(len, source); + return string(buf, len); +} + + +static void skipGeneric(RestoreSource & source) +{ + if (readString(source) == "(") { + while (readString(source) != ")") + skipGeneric(source); + } +} + + +static void restore(const Path & path, RestoreSource & source); + + +static void restoreEntry(const Path & path, RestoreSource & source) +{ + string s, name; + + s = readString(source); + if (s != "(") throw badArchive("expected open tag"); + + while (1) { + s = readString(source); + + if (s == ")") { + break; + } else if (s == "name") { + name = readString(source); + } else if (s == "node") { + if (s == "") throw badArchive("entry name missing"); + restore(path + "/" + name, source); + } else { + throw badArchive("unknown field " + s); + skipGeneric(source); + } + } +} + + +static void restoreContents(int fd, const Path & path, RestoreSource & source) +{ + unsigned int size = readInt(source); + unsigned int left = size; + unsigned char buf[65536]; + + while (left) { + unsigned int n = sizeof(buf); + if (n > left) n = left; + source(buf, n); + if (write(fd, buf, n) != (ssize_t) n) + throw SysError("writing file " + path); + left -= n; + } + + readPadding(size, source); +} + + +static void restore(const Path & path, RestoreSource & source) +{ + string s; + + s = readString(source); + if (s != "(") throw badArchive("expected open tag"); + + enum { tpUnknown, tpRegular, tpDirectory, tpSymlink } type = tpUnknown; + AutoCloseFD fd; + + while (1) { + s = readString(source); + + if (s == ")") { + break; + } + + else if (s == "type") { + if (type != tpUnknown) + throw badArchive("multiple type fields"); + string t = readString(source); + + if (t == "regular") { + type = tpRegular; + fd = open(path.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0666); + if (fd == -1) + throw SysError("creating file " + path); + } + + else if (t == "directory") { + type = tpDirectory; + if (mkdir(path.c_str(), 0777) == -1) + throw SysError("creating directory " + path); + } + + else if (t == "symlink") { + type = tpSymlink; + } + + else throw badArchive("unknown file type " + t); + + } + + else if (s == "contents" && type == tpRegular) { + restoreContents(fd, path, source); + } + + else if (s == "executable" && type == tpRegular) { + readString(source); + struct stat st; + if (fstat(fd, &st) == -1) + throw SysError("fstat"); + if (fchmod(fd, st.st_mode | (S_IXUSR | S_IXGRP | S_IXOTH)) == -1) + throw SysError("fchmod"); + } + + else if (s == "entry" && type == tpDirectory) { + restoreEntry(path, source); + } + + else if (s == "target" && type == tpSymlink) { + string target = readString(source); + if (symlink(target.c_str(), path.c_str()) == -1) + throw SysError("creating symlink " + path); + } + + else { + throw badArchive("unknown field " + s); + skipGeneric(source); + } + + } +} + + +void restorePath(const Path & path, RestoreSource & source) +{ + if (readString(source) != archiveVersion1) + throw badArchive("expected Nix archive"); + restore(path, source); +} + diff --git a/src/libutil/archive.hh b/src/libutil/archive.hh new file mode 100644 index 000000000..67e236668 --- /dev/null +++ b/src/libutil/archive.hh @@ -0,0 +1,60 @@ +#include <string> + +#include "util.hh" + + +/* dumpPath creates a Nix archive of the specified path. The format + is as follows: + + IF path points to a REGULAR FILE: + dump(path) = attrs( + [ ("type", "regular") + , ("contents", contents(path)) + ]) + + IF path points to a DIRECTORY: + dump(path) = attrs( + [ ("type", "directory") + , ("entries", concat(map(f, sort(entries(path))))) + ]) + where f(fn) = attrs( + [ ("name", fn) + , ("file", dump(path + "/" + fn)) + ]) + + where: + + attrs(as) = concat(map(attr, as)) + encN(0) + attrs((a, b)) = encS(a) + encS(b) + + encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary) + + encN(n) = 64-bit little-endian encoding of n. + + contents(path) = the contents of a regular file. + + sort(strings) = lexicographic sort by 8-bit value (strcmp). + + entries(path) = the entries of a directory, without `.' and + `..'. + + `+' denotes string concatenation. */ + +struct DumpSink +{ + virtual void operator () (const unsigned char * data, unsigned int len) = 0; +}; + +void dumpPath(const Path & path, DumpSink & sink); + + +struct RestoreSource +{ + /* The callee should store exactly *len bytes in the buffer + pointed to by data. It should block if that much data is not + yet available, or throw an error if it is not going to be + available. */ + virtual void operator () (unsigned char * data, unsigned int len) = 0; +}; + +void restorePath(const Path & path, RestoreSource & source); diff --git a/src/libutil/aterm.cc b/src/libutil/aterm.cc new file mode 100644 index 000000000..de7c35952 --- /dev/null +++ b/src/libutil/aterm.cc @@ -0,0 +1,93 @@ +#include "aterm.hh" + + +string atPrint(ATerm t) +{ + if (!t) throw Error("attempt to print null aterm"); + char * s = ATwriteToString(t); + if (!s) throw Error("cannot print term"); + return s; +} + + +ostream & operator << (ostream & stream, ATerm e) +{ + return stream << atPrint(e); +} + + +ATMatcher & atMatch(ATMatcher & pos, ATerm t) +{ + pos.t = t; + pos.pos = ATMatcher::funPos; + return pos; +} + + +static inline bool failed(const ATMatcher & pos) +{ + return pos.pos == ATMatcher::failPos; +} + + +static inline ATMatcher & fail(ATMatcher & pos) +{ + pos.pos = ATMatcher::failPos; + return pos; +} + + +ATMatcher & operator >> (ATMatcher & pos, ATerm & out) +{ + out = 0; + if (failed(pos)) return pos; + if (pos.pos == ATMatcher::funPos || + ATgetType(pos.t) != AT_APPL || + pos.pos >= (int) ATgetArity(ATgetAFun(pos.t))) + return fail(pos); + out = ATgetArgument(pos.t, pos.pos); + pos.pos++; + return pos; +} + + +ATMatcher & operator >> (ATMatcher & pos, string & out) +{ + out = ""; + if (pos.pos == ATMatcher::funPos) { + if (ATgetType(pos.t) != AT_APPL) return fail(pos); + out = ATgetName(ATgetAFun(pos.t)); + pos.pos = 0; + } else { + ATerm t; + pos = pos >> t; + if (failed(pos)) return pos; + if (ATgetType(t) != AT_APPL || + ATgetArity(ATgetAFun(t)) != 0) + return fail(pos); + out = ATgetName(ATgetAFun(t)); + } + return pos; +} + + +ATMatcher & operator >> (ATMatcher & pos, const string & s) +{ + string s2; + pos = pos >> s2; + if (failed(pos)) return pos; + if (s != s2) return fail(pos); + return pos; +} + + +ATMatcher & operator >> (ATMatcher & pos, ATermList & out) +{ + out = 0; + ATerm t; + pos = pos >> t; + if (failed(pos)) return pos; + if (ATgetType(t) != AT_LIST) return fail(pos); + out = (ATermList) t; + return pos; +} diff --git a/src/libutil/aterm.hh b/src/libutil/aterm.hh new file mode 100644 index 000000000..16d8d6bb6 --- /dev/null +++ b/src/libutil/aterm.hh @@ -0,0 +1,77 @@ +#ifndef __ATERM_H +#define __ATERM_H + +extern "C" { +#include <aterm2.h> +} + +#include "util.hh" + + +/* Print an ATerm. */ +string atPrint(ATerm t); + +/* Write an ATerm to an output stream. */ +ostream & operator << (ostream & stream, ATerm e); + +class ATermIterator +{ + ATermList t; + +public: + ATermIterator(ATermList _t) : t(_t) { } + ATermIterator & operator ++ () + { + t = ATgetNext(t); + return *this; + } + ATerm operator * () + { + return ATgetFirst(t); + } + operator bool () + { + return t != ATempty; + } +}; + + +/* Type-safe matching. */ + +struct ATMatcher +{ + ATerm t; + int pos; + const static int failPos = -2; + const static int funPos = -1; + + ATMatcher() : t(0), pos(failPos) + { + } + + operator bool() const + { + return pos != failPos; + } +}; + +/* Initiate matching of a term. */ +ATMatcher & atMatch(ATMatcher & pos, ATerm t); + +/* Get the next argument of an application. */ +ATMatcher & operator >> (ATMatcher & pos, ATerm & out); + +/* Get the name of the function symbol of an applicatin, or the next + argument of an application as a string. */ +ATMatcher & operator >> (ATMatcher & pos, string & out); + +/* Like the previous, but check that the string is equal to the given + string. */ +ATMatcher & operator >> (ATMatcher & pos, const string & s); + +/* Get the next argument of an application, and verify that it is a + list. */ +ATMatcher & operator >> (ATMatcher & pos, ATermList & out); + + +#endif /* !__ATERM_H */ diff --git a/src/libutil/hash.cc b/src/libutil/hash.cc new file mode 100644 index 000000000..752b26912 --- /dev/null +++ b/src/libutil/hash.cc @@ -0,0 +1,124 @@ +#include <iostream> + +extern "C" { +#include "md5.h" +} + +#include "hash.hh" +#include "archive.hh" + + +Hash::Hash() +{ + memset(hash, 0, sizeof(hash)); +} + + +bool Hash::operator == (const Hash & h2) const +{ + for (unsigned int i = 0; i < hashSize; i++) + if (hash[i] != h2.hash[i]) return false; + return true; +} + + +bool Hash::operator != (const Hash & h2) const +{ + return !(*this == h2); +} + + +bool Hash::operator < (const Hash & h) const +{ + for (unsigned int i = 0; i < hashSize; i++) { + if (hash[i] < h.hash[i]) return true; + if (hash[i] > h.hash[i]) return false; + } + return false; +} + + +Hash::operator string() const +{ + ostringstream str; + for (unsigned int i = 0; i < hashSize; i++) { + str.fill('0'); + str.width(2); + str << hex << (int) hash[i]; + } + return str.str(); +} + + +Hash parseHash(const string & s) +{ + Hash hash; + if (s.length() != Hash::hashSize * 2) + throw Error(format("invalid hash `%1%'") % s); + for (unsigned int i = 0; i < Hash::hashSize; i++) { + string s2(s, i * 2, 2); + if (!isxdigit(s2[0]) || !isxdigit(s2[1])) + throw Error(format("invalid hash `%1%'") % s); + istringstream str(s2); + int n; + str >> hex >> n; + hash.hash[i] = n; + } + return hash; +} + + +bool isHash(const string & s) +{ + if (s.length() != 32) return false; + for (int i = 0; i < 32; i++) { + char c = s[i]; + if (!((c >= '0' && c <= '9') || + (c >= 'a' && c <= 'f'))) + return false; + } + return true; +} + + +Hash hashString(const string & s) +{ + Hash hash; + md5_buffer(s.c_str(), s.length(), hash.hash); + return hash; +} + + +Hash hashFile(const Path & path) +{ + Hash hash; + FILE * file = fopen(path.c_str(), "rb"); + if (!file) + throw SysError(format("file `%1%' does not exist") % path); + int err = md5_stream(file, hash.hash); + fclose(file); + if (err) throw SysError(format("cannot hash file `%1%'") % path); + return hash; +} + + +struct HashSink : DumpSink +{ + struct md5_ctx ctx; + virtual void operator () + (const unsigned char * data, unsigned int len) + { + md5_process_bytes(data, len, &ctx); + } +}; + + +Hash hashPath(const Path & path) +{ + Hash hash; + HashSink sink; + md5_init_ctx(&sink.ctx); + dumpPath(path, sink); + md5_finish_ctx(&sink.ctx, hash.hash); + return hash; +} diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh new file mode 100644 index 000000000..0062f987c --- /dev/null +++ b/src/libutil/hash.hh @@ -0,0 +1,51 @@ +#ifndef __HASH_H +#define __HASH_H + +#include <string> + +#include "util.hh" + +using namespace std; + + +struct Hash +{ + static const unsigned int hashSize = 16; + unsigned char hash[hashSize]; + + /* Create a zeroed hash object. */ + Hash(); + + /* Check whether two hash are equal. */ + bool operator == (const Hash & h2) const; + + /* Check whether two hash are not equal. */ + bool operator != (const Hash & h2) const; + + /* For sorting. */ + bool operator < (const Hash & h) const; + + /* Convert a hash code into a hexadecimal representation. */ + operator string() const; +}; + + +/* Parse a hexadecimal representation of a hash code. */ +Hash parseHash(const string & s); + +/* Verify that the given string is a valid hash code. */ +bool isHash(const string & s); + +/* Compute the hash of the given string. */ +Hash hashString(const string & s); + +/* Compute the hash of the given file. */ +Hash hashFile(const Path & path); + +/* Compute the hash of the given path. The hash is defined as + md5(dump(path)). +*/ +Hash hashPath(const Path & path); + + +#endif /* !__HASH_H */ diff --git a/src/libutil/md5.c b/src/libutil/md5.c new file mode 100644 index 000000000..fa67ebfcd --- /dev/null +++ b/src/libutil/md5.c @@ -0,0 +1,448 @@ +/* Functions to compute MD5 message digest of files or memory blocks. + according to the definition of MD5 in RFC 1321 from April 1992. + Copyright (C) 1995,1996,1997,1999,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <sys/types.h> + +#include <stdlib.h> +#include <string.h> + +#include "md5.h" + + +static md5_uint32 SWAP(md5_uint32 n) +{ + static int checked = 0; + static int bigendian = 0; + static md5_uint32 test; + + if (!checked) { + test = 1; + if (* (char *) &test == 0) + bigendian = 1; + checked = 1; + } + + if (bigendian) + return (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24)); + else + return n; +} + + +/* This array contains the bytes used to pad the buffer to the next + 64-byte boundary. (RFC 1321, 3.1: Step 1) */ +static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ }; + + +/* Initialize structure containing state of computation. + (RFC 1321, 3.3: Step 3) */ +void +md5_init_ctx (ctx) + struct md5_ctx *ctx; +{ + ctx->A = 0x67452301; + ctx->B = 0xefcdab89; + ctx->C = 0x98badcfe; + ctx->D = 0x10325476; + + ctx->total[0] = ctx->total[1] = 0; + ctx->buflen = 0; +} + +/* Put result from CTX in first 16 bytes following RESBUF. The result + must be in little endian byte order. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +void * +md5_read_ctx (ctx, resbuf) + const struct md5_ctx *ctx; + void *resbuf; +{ + ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A); + ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B); + ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C); + ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D); + + return resbuf; +} + +/* Process the remaining bytes in the internal buffer and the usual + prolog according to the standard and write the result to RESBUF. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +void * +md5_finish_ctx (ctx, resbuf) + struct md5_ctx *ctx; + void *resbuf; +{ + /* Take yet unprocessed bytes into account. */ + md5_uint32 bytes = ctx->buflen; + size_t pad; + + /* Now count remaining bytes. */ + ctx->total[0] += bytes; + if (ctx->total[0] < bytes) + ++ctx->total[1]; + + pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes; + memcpy (&ctx->buffer[bytes], fillbuf, pad); + + /* Put the 64-bit file length in *bits* at the end of the buffer. */ + *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3); + *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) | + (ctx->total[0] >> 29)); + + /* Process last bytes. */ + md5_process_block (ctx->buffer, bytes + pad + 8, ctx); + + return md5_read_ctx (ctx, resbuf); +} + +/* Compute MD5 message digest for bytes read from STREAM. The + resulting message digest number will be written into the 16 bytes + beginning at RESBLOCK. */ +int +md5_stream (stream, resblock) + FILE *stream; + void *resblock; +{ + /* Important: BLOCKSIZE must be a multiple of 64. */ +#define BLOCKSIZE 4096 + struct md5_ctx ctx; + char buffer[BLOCKSIZE + 72]; + size_t sum; + + /* Initialize the computation context. */ + md5_init_ctx (&ctx); + + /* Iterate over full file contents. */ + while (1) + { + /* We read the file in blocks of BLOCKSIZE bytes. One call of the + computation function processes the whole buffer so that with the + next round of the loop another block can be read. */ + size_t n; + sum = 0; + + /* Read block. Take care for partial reads. */ + do + { + n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream); + + sum += n; + } + while (sum < BLOCKSIZE && n != 0); + if (n == 0 && ferror (stream)) + return 1; + + /* If end of file is reached, end the loop. */ + if (n == 0) + break; + + /* Process buffer with BLOCKSIZE bytes. Note that + BLOCKSIZE % 64 == 0 + */ + md5_process_block (buffer, BLOCKSIZE, &ctx); + } + + /* Add the last bytes if necessary. */ + if (sum > 0) + md5_process_bytes (buffer, sum, &ctx); + + /* Construct result in desired memory. */ + md5_finish_ctx (&ctx, resblock); + return 0; +} + +/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The + result is always in little endian byte order, so that a byte-wise + output yields to the wanted ASCII representation of the message + digest. */ +void * +md5_buffer (buffer, len, resblock) + const char *buffer; + size_t len; + void *resblock; +{ + struct md5_ctx ctx; + + /* Initialize the computation context. */ + md5_init_ctx (&ctx); + + /* Process whole buffer but last len % 64 bytes. */ + md5_process_bytes (buffer, len, &ctx); + + /* Put result in desired memory area. */ + return md5_finish_ctx (&ctx, resblock); +} + + +void +md5_process_bytes (buffer, len, ctx) + const void *buffer; + size_t len; + struct md5_ctx *ctx; +{ + /* When we already have some bits in our internal buffer concatenate + both inputs first. */ + if (ctx->buflen != 0) + { + size_t left_over = ctx->buflen; + size_t add = 128 - left_over > len ? len : 128 - left_over; + + memcpy (&ctx->buffer[left_over], buffer, add); + ctx->buflen += add; + + if (ctx->buflen > 64) + { + md5_process_block (ctx->buffer, ctx->buflen & ~63, ctx); + + ctx->buflen &= 63; + /* The regions in the following copy operation cannot overlap. */ + memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63], + ctx->buflen); + } + + buffer = (const char *) buffer + add; + len -= add; + } + + /* Process available complete blocks. */ + if (len >= 64) + { +#if !_STRING_ARCH_unaligned +/* To check alignment gcc has an appropriate operator. Other + compilers don't. */ +# if __GNUC__ >= 2 +# define UNALIGNED_P(p) (((md5_uintptr) p) % __alignof__ (md5_uint32) != 0) +# else +# define UNALIGNED_P(p) (((md5_uintptr) p) % sizeof (md5_uint32) != 0) +# endif + if (UNALIGNED_P (buffer)) + while (len > 64) + { + md5_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx); + buffer = (const char *) buffer + 64; + len -= 64; + } + else +#endif + { + md5_process_block (buffer, len & ~63, ctx); + buffer = (const char *) buffer + (len & ~63); + len &= 63; + } + } + + /* Move remaining bytes in internal buffer. */ + if (len > 0) + { + size_t left_over = ctx->buflen; + + memcpy (&ctx->buffer[left_over], buffer, len); + left_over += len; + if (left_over >= 64) + { + md5_process_block (ctx->buffer, 64, ctx); + left_over -= 64; + memcpy (ctx->buffer, &ctx->buffer[64], left_over); + } + ctx->buflen = left_over; + } +} + + +/* These are the four functions used in the four steps of the MD5 algorithm + and defined in the RFC 1321. The first function is a little bit optimized + (as found in Colin Plumbs public domain implementation). */ +/* #define FF(b, c, d) ((b & c) | (~b & d)) */ +#define FF(b, c, d) (d ^ (b & (c ^ d))) +#define FG(b, c, d) FF (d, b, c) +#define FH(b, c, d) (b ^ c ^ d) +#define FI(b, c, d) (c ^ (b | ~d)) + +/* Process LEN bytes of BUFFER, accumulating context into CTX. + It is assumed that LEN % 64 == 0. */ + +void +md5_process_block (buffer, len, ctx) + const void *buffer; + size_t len; + struct md5_ctx *ctx; +{ + md5_uint32 correct_words[16]; + const md5_uint32 *words = buffer; + size_t nwords = len / sizeof (md5_uint32); + const md5_uint32 *endp = words + nwords; + md5_uint32 A = ctx->A; + md5_uint32 B = ctx->B; + md5_uint32 C = ctx->C; + md5_uint32 D = ctx->D; + + /* First increment the byte count. RFC 1321 specifies the possible + length of the file up to 2^64 bits. Here we only compute the + number of bytes. Do a double word increment. */ + ctx->total[0] += len; + if (ctx->total[0] < len) + ++ctx->total[1]; + + /* Process all bytes in the buffer with 64 bytes in each round of + the loop. */ + while (words < endp) + { + md5_uint32 *cwp = correct_words; + md5_uint32 A_save = A; + md5_uint32 B_save = B; + md5_uint32 C_save = C; + md5_uint32 D_save = D; + + /* First round: using the given function, the context and a constant + the next context is computed. Because the algorithms processing + unit is a 32-bit word and it is determined to work on words in + little endian byte order we perhaps have to change the byte order + before the computation. To reduce the work for the next steps + we store the swapped words in the array CORRECT_WORDS. */ + +#define OP(a, b, c, d, s, T) \ + do \ + { \ + a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \ + ++words; \ + CYCLIC (a, s); \ + a += b; \ + } \ + while (0) + + /* It is unfortunate that C does not provide an operator for + cyclic rotation. Hope the C compiler is smart enough. */ +#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s))) + + /* Before we start, one word to the strange constants. + They are defined in RFC 1321 as + + T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64 + */ + + /* Round 1. */ + OP (A, B, C, D, 7, 0xd76aa478); + OP (D, A, B, C, 12, 0xe8c7b756); + OP (C, D, A, B, 17, 0x242070db); + OP (B, C, D, A, 22, 0xc1bdceee); + OP (A, B, C, D, 7, 0xf57c0faf); + OP (D, A, B, C, 12, 0x4787c62a); + OP (C, D, A, B, 17, 0xa8304613); + OP (B, C, D, A, 22, 0xfd469501); + OP (A, B, C, D, 7, 0x698098d8); + OP (D, A, B, C, 12, 0x8b44f7af); + OP (C, D, A, B, 17, 0xffff5bb1); + OP (B, C, D, A, 22, 0x895cd7be); + OP (A, B, C, D, 7, 0x6b901122); + OP (D, A, B, C, 12, 0xfd987193); + OP (C, D, A, B, 17, 0xa679438e); + OP (B, C, D, A, 22, 0x49b40821); + + /* For the second to fourth round we have the possibly swapped words + in CORRECT_WORDS. Redefine the macro to take an additional first + argument specifying the function to use. */ +#undef OP +#define OP(f, a, b, c, d, k, s, T) \ + do \ + { \ + a += f (b, c, d) + correct_words[k] + T; \ + CYCLIC (a, s); \ + a += b; \ + } \ + while (0) + + /* Round 2. */ + OP (FG, A, B, C, D, 1, 5, 0xf61e2562); + OP (FG, D, A, B, C, 6, 9, 0xc040b340); + OP (FG, C, D, A, B, 11, 14, 0x265e5a51); + OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa); + OP (FG, A, B, C, D, 5, 5, 0xd62f105d); + OP (FG, D, A, B, C, 10, 9, 0x02441453); + OP (FG, C, D, A, B, 15, 14, 0xd8a1e681); + OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8); + OP (FG, A, B, C, D, 9, 5, 0x21e1cde6); + OP (FG, D, A, B, C, 14, 9, 0xc33707d6); + OP (FG, C, D, A, B, 3, 14, 0xf4d50d87); + OP (FG, B, C, D, A, 8, 20, 0x455a14ed); + OP (FG, A, B, C, D, 13, 5, 0xa9e3e905); + OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8); + OP (FG, C, D, A, B, 7, 14, 0x676f02d9); + OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a); + + /* Round 3. */ + OP (FH, A, B, C, D, 5, 4, 0xfffa3942); + OP (FH, D, A, B, C, 8, 11, 0x8771f681); + OP (FH, C, D, A, B, 11, 16, 0x6d9d6122); + OP (FH, B, C, D, A, 14, 23, 0xfde5380c); + OP (FH, A, B, C, D, 1, 4, 0xa4beea44); + OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9); + OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60); + OP (FH, B, C, D, A, 10, 23, 0xbebfbc70); + OP (FH, A, B, C, D, 13, 4, 0x289b7ec6); + OP (FH, D, A, B, C, 0, 11, 0xeaa127fa); + OP (FH, C, D, A, B, 3, 16, 0xd4ef3085); + OP (FH, B, C, D, A, 6, 23, 0x04881d05); + OP (FH, A, B, C, D, 9, 4, 0xd9d4d039); + OP (FH, D, A, B, C, 12, 11, 0xe6db99e5); + OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8); + OP (FH, B, C, D, A, 2, 23, 0xc4ac5665); + + /* Round 4. */ + OP (FI, A, B, C, D, 0, 6, 0xf4292244); + OP (FI, D, A, B, C, 7, 10, 0x432aff97); + OP (FI, C, D, A, B, 14, 15, 0xab9423a7); + OP (FI, B, C, D, A, 5, 21, 0xfc93a039); + OP (FI, A, B, C, D, 12, 6, 0x655b59c3); + OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92); + OP (FI, C, D, A, B, 10, 15, 0xffeff47d); + OP (FI, B, C, D, A, 1, 21, 0x85845dd1); + OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f); + OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0); + OP (FI, C, D, A, B, 6, 15, 0xa3014314); + OP (FI, B, C, D, A, 13, 21, 0x4e0811a1); + OP (FI, A, B, C, D, 4, 6, 0xf7537e82); + OP (FI, D, A, B, C, 11, 10, 0xbd3af235); + OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb); + OP (FI, B, C, D, A, 9, 21, 0xeb86d391); + + /* Add the starting values of the context. */ + A += A_save; + B += B_save; + C += C_save; + D += D_save; + } + + /* Put checksum in context given as argument. */ + ctx->A = A; + ctx->B = B; + ctx->C = C; + ctx->D = D; +} diff --git a/src/libutil/md5.h b/src/libutil/md5.h new file mode 100644 index 000000000..6301e4558 --- /dev/null +++ b/src/libutil/md5.h @@ -0,0 +1,151 @@ +/* Declaration of functions and data types used for MD5 sum computing + library functions. + Copyright (C) 1995,1996,1997,1999,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _MD5_H +#define _MD5_H 1 + +#include <stdio.h> + +#if defined HAVE_LIMITS_H || _LIBC +# include <limits.h> +#endif + +/* The following contortions are an attempt to use the C preprocessor + to determine an unsigned integral type that is 32 bits wide. An + alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but + doing that would require that the configure script compile and *run* + the resulting executable. Locally running cross-compiled executables + is usually not possible. */ + +#ifdef _LIBC +# include <stdint.h> +typedef uint32_t md5_uint32; +typedef uintptr_t md5_uintptr; +#else +# if defined __STDC__ && __STDC__ +# define UINT_MAX_32_BITS 4294967295U +# else +# define UINT_MAX_32_BITS 0xFFFFFFFF +# endif + +/* If UINT_MAX isn't defined, assume it's a 32-bit type. + This should be valid for all systems GNU cares about because + that doesn't include 16-bit systems, and only modern systems + (that certainly have <limits.h>) have 64+-bit integral types. */ + +# ifndef UINT_MAX +# define UINT_MAX UINT_MAX_32_BITS +# endif + +# if UINT_MAX == UINT_MAX_32_BITS + typedef unsigned int md5_uint32; +# else +# if USHRT_MAX == UINT_MAX_32_BITS + typedef unsigned short md5_uint32; +# else +# if ULONG_MAX == UINT_MAX_32_BITS + typedef unsigned long md5_uint32; +# else + /* The following line is intended to evoke an error. + Using #error is not portable enough. */ + "Cannot determine unsigned 32-bit data type." +# endif +# endif +# endif +/* We have to make a guess about the integer type equivalent in size + to pointers which should always be correct. */ +typedef unsigned long int md5_uintptr; +#endif + +#undef __P +#if defined (__STDC__) && __STDC__ +# define __P(x) x +#else +# define __P(x) () +#endif + +/* Structure to save state of computation between the single steps. */ +struct md5_ctx +{ + md5_uint32 A; + md5_uint32 B; + md5_uint32 C; + md5_uint32 D; + + md5_uint32 total[2]; + md5_uint32 buflen; + char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); +}; + +/* + * The following three functions are build up the low level used in + * the functions `md5_stream' and `md5_buffer'. + */ + +/* Initialize structure containing state of computation. + (RFC 1321, 3.3: Step 3) */ +extern void md5_init_ctx __P ((struct md5_ctx *ctx)); + +/* Starting with the result of former calls of this function (or the + initialization function update the context for the next LEN bytes + starting at BUFFER. + It is necessary that LEN is a multiple of 64!!! */ +extern void md5_process_block __P ((const void *buffer, size_t len, + struct md5_ctx *ctx)); + +/* Starting with the result of former calls of this function (or the + initialization function update the context for the next LEN bytes + starting at BUFFER. + It is NOT required that LEN is a multiple of 64. */ +extern void md5_process_bytes __P ((const void *buffer, size_t len, + struct md5_ctx *ctx)); + +/* Process the remaining bytes in the buffer and put result from CTX + in first 16 bytes following RESBUF. The result is always in little + endian byte order, so that a byte-wise output yields to the wanted + ASCII representation of the message digest. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); + + +/* Put result from CTX in first 16 bytes following RESBUF. The result is + always in little endian byte order, so that a byte-wise output yields + to the wanted ASCII representation of the message digest. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); + + +/* Compute MD5 message digest for bytes read from STREAM. The + resulting message digest number will be written into the 16 bytes + beginning at RESBLOCK. */ +extern int md5_stream __P ((FILE *stream, void *resblock)); + +/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The + result is always in little endian byte order, so that a byte-wise + output yields to the wanted ASCII representation of the message + digest. */ +extern void *md5_buffer __P ((const char *buffer, size_t len, + void *resblock)); + +#endif /* md5.h */ diff --git a/src/libutil/test-aterm.cc b/src/libutil/test-aterm.cc new file mode 100644 index 000000000..325639ca4 --- /dev/null +++ b/src/libutil/test-aterm.cc @@ -0,0 +1,66 @@ +#include "aterm.hh" +#include <iostream> + + +void runTests() +{ + verbosity = lvlDebug; + + ATMatcher pos; + + ATerm t = ATmake("Call(Foo, Bar, \"xyz\")"); + + debug(format("term: %1%") % t); + + string fun, arg3; + ATerm lhs, rhs; + + if (!(atMatch(pos, t) >> "Call" >> lhs >> rhs >> arg3)) + throw Error("should succeed"); + if (arg3 != "xyz") throw Error("bad 1"); + + if (!(atMatch(pos, t) >> fun >> lhs >> rhs >> arg3)) + throw Error("should succeed"); + if (fun != "Call") throw Error("bad 2"); + if (arg3 != "xyz") throw Error("bad 3"); + + if (!(atMatch(pos, t) >> fun >> lhs >> rhs >> "xyz")) + throw Error("should succeed"); + + if (atMatch(pos, t) >> fun >> lhs >> rhs >> "abc") + throw Error("should fail"); + + if (atMatch(pos, t) >> "Call" >> lhs >> rhs >> "abc") + throw Error("should fail"); + + t = ATmake("X([A, B, C], \"abc\")"); + + ATerm t1, t2, t3; + if (atMatch(pos, t) >> "X" >> t1 >> t2 >> t3) + throw Error("should fail"); + if (!(atMatch(pos, t) >> "X" >> t1 >> t2)) + throw Error("should succeed"); + ATermList ts; + if (!(atMatch(pos, t) >> "X" >> ts >> t2)) + throw Error("should succeed"); + if (ATgetLength(ts) != 3) + throw Error("bad"); + if (atMatch(pos, t) >> "X" >> t1 >> ts) + throw Error("should fail"); +} + + +int main(int argc, char * * argv) +{ + ATerm bottomOfStack; + ATinit(argc, argv, &bottomOfStack); + + try { + runTests(); + } catch (Error & e) { + printMsg(lvlError, format("error: %1%") % e.msg()); + return 1; + } + + return 0; +} diff --git a/src/libutil/util.cc b/src/libutil/util.cc new file mode 100644 index 000000000..299a37f6c --- /dev/null +++ b/src/libutil/util.cc @@ -0,0 +1,318 @@ +#include <iostream> +#include <cerrno> +#include <cstdio> + +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <dirent.h> + +#include "util.hh" + + +string thisSystem = SYSTEM; + + +Error::Error(const format & f) +{ + err = f.str(); +} + + +SysError::SysError(const format & f) + : Error(format("%1%: %2%") % f.str() % strerror(errno)) +{ +} + + +Path absPath(Path path, Path dir) +{ + if (path[0] != '/') { + if (dir == "") { + char buf[PATH_MAX]; + if (!getcwd(buf, sizeof(buf))) + throw SysError("cannot get cwd"); + dir = buf; + } + path = dir + "/" + path; + } + return canonPath(path); +} + + +Path canonPath(const Path & path) +{ + string s; + + if (path[0] != '/') + throw Error(format("not an absolute path: `%1%'") % path); + + string::const_iterator i = path.begin(), end = path.end(); + + while (1) { + + /* Skip slashes. */ + while (i != end && *i == '/') i++; + if (i == end) break; + + /* Ignore `.'. */ + if (*i == '.' && (i + 1 == end || i[1] == '/')) + i++; + + /* If `..', delete the last component. */ + else if (*i == '.' && i + 1 < end && i[1] == '.' && + (i + 2 == end || i[2] == '/')) + { + if (!s.empty()) s.erase(s.rfind('/')); + i += 2; + } + + /* Normal component; copy it. */ + else { + s += '/'; + while (i != end && *i != '/') s += *i++; + } + } + + return s.empty() ? "/" : s; +} + + +Path dirOf(const Path & path) +{ + unsigned int pos = path.rfind('/'); + if (pos == string::npos) + throw Error(format("invalid file name: %1%") % path); + return Path(path, 0, pos); +} + + +string baseNameOf(const Path & path) +{ + unsigned int pos = path.rfind('/'); + if (pos == string::npos) + throw Error(format("invalid file name %1% ") % path); + return string(path, pos + 1); +} + + +bool pathExists(const Path & path) +{ + int res; + struct stat st; + res = stat(path.c_str(), &st); + if (!res) return true; + if (errno != ENOENT) + throw SysError(format("getting status of %1%") % path); + return false; +} + + +void deletePath(const Path & path) +{ + printMsg(lvlVomit, format("deleting path `%1%'") % path); + + struct stat st; + if (lstat(path.c_str(), &st)) + throw SysError(format("getting attributes of path `%1%'") % path); + + if (S_ISDIR(st.st_mode)) { + Strings names; + + { + AutoCloseDir dir = opendir(path.c_str()); + + struct dirent * dirent; + while (errno = 0, dirent = readdir(dir)) { + string name = dirent->d_name; + if (name == "." || name == "..") continue; + names.push_back(name); + } + } /* scoped to ensure that dir is closed at this point */ + + /* Make the directory writable. */ + if (!(st.st_mode & S_IWUSR)) { + if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1) + throw SysError(format("making `%1%' writable")); + } + + for (Strings::iterator i = names.begin(); i != names.end(); i++) + deletePath(path + "/" + *i); + } + + if (remove(path.c_str()) == -1) + throw SysError(format("cannot unlink `%1%'") % path); +} + + +void makePathReadOnly(const Path & path) +{ + struct stat st; + if (lstat(path.c_str(), &st)) + throw SysError(format("getting attributes of path `%1%'") % path); + + if (!S_ISLNK(st.st_mode) && (st.st_mode & S_IWUSR)) { + if (chmod(path.c_str(), st.st_mode & ~S_IWUSR) == -1) + throw SysError(format("making `%1%' read-only") % path); + } + + if (S_ISDIR(st.st_mode)) { + AutoCloseDir dir = opendir(path.c_str()); + + struct dirent * dirent; + while (errno = 0, dirent = readdir(dir)) { + string name = dirent->d_name; + if (name == "." || name == "..") continue; + makePathReadOnly(path + "/" + name); + } + } +} + + +static Path tempName() +{ + static int counter = 0; + char * s = getenv("TMPDIR"); + Path tmpRoot = s ? canonPath(Path(s)) : "/tmp"; + return (format("%1%/nix-%2%-%3%") % tmpRoot % getpid() % counter++).str(); +} + + +Path createTempDir() +{ + while (1) { + Path tmpDir = tempName(); + if (mkdir(tmpDir.c_str(), 0777) == 0) return tmpDir; + if (errno != EEXIST) + throw SysError(format("creating directory `%1%'") % tmpDir); + } +} + + +Verbosity verbosity = lvlError; + +static int nestingLevel = 0; + + +Nest::Nest() +{ + nest = false; +} + + +Nest::~Nest() +{ + if (nest) nestingLevel--; +} + + +void Nest::open(Verbosity level, const format & f) +{ + if (level <= verbosity) { + printMsg_(level, f); + nest = true; + nestingLevel++; + } +} + + +void printMsg_(Verbosity level, const format & f) +{ + if (level > verbosity) return; + string spaces; + for (int i = 0; i < nestingLevel; i++) + spaces += "| "; + cerr << format("%1%%2%\n") % spaces % f.str(); +} + + +void readFull(int fd, unsigned char * buf, size_t count) +{ + while (count) { + ssize_t res = read(fd, (char *) buf, count); + if (res == -1) throw SysError("reading from file"); + if (res == 0) throw Error("unexpected end-of-file"); + count -= res; + buf += res; + } +} + + +void writeFull(int fd, const unsigned char * buf, size_t count) +{ + while (count) { + ssize_t res = write(fd, (char *) buf, count); + if (res == -1) throw SysError("writing to file"); + count -= res; + buf += res; + } +} + + +AutoDelete::AutoDelete(const string & p) : path(p) +{ + del = true; +} + +AutoDelete::~AutoDelete() +{ + if (del) deletePath(path); +} + +void AutoDelete::cancel() +{ + del = false; +} + + +AutoCloseFD::AutoCloseFD() +{ + fd = -1; +} + +AutoCloseFD::AutoCloseFD(int fd) +{ + this->fd = fd; +} + +AutoCloseFD::~AutoCloseFD() +{ + if (fd != -1) close(fd); +} + +void AutoCloseFD::operator =(int fd) +{ + this->fd = fd; +} + +AutoCloseFD::operator int() +{ + return fd; +} + + +AutoCloseDir::AutoCloseDir() +{ + dir = 0; +} + +AutoCloseDir::AutoCloseDir(DIR * dir) +{ + this->dir = dir; +} + +AutoCloseDir::~AutoCloseDir() +{ + if (dir) closedir(dir); +} + +void AutoCloseDir::operator =(DIR * dir) +{ + this->dir = dir; +} + +AutoCloseDir::operator DIR *() +{ + return dir; +} + diff --git a/src/libutil/util.hh b/src/libutil/util.hh new file mode 100644 index 000000000..e6b600eff --- /dev/null +++ b/src/libutil/util.hh @@ -0,0 +1,168 @@ +#ifndef __UTIL_H +#define __UTIL_H + +#include <string> +#include <list> +#include <set> +#include <sstream> + +#include <sys/types.h> +#include <dirent.h> +#include <unistd.h> + +#include <boost/format.hpp> + +using namespace std; +using namespace boost; + + +class Error : public exception +{ +protected: + string err; +public: + Error(const format & f); + ~Error() throw () { }; + const char * what() const throw () { return err.c_str(); } + const string & msg() const throw () { return err; } +}; + +class SysError : public Error +{ +public: + SysError(const format & f); +}; + +class UsageError : public Error +{ +public: + UsageError(const format & f) : Error(f) { }; +}; + + +typedef list<string> Strings; +typedef set<string> StringSet; + + +/* Paths are just strings. */ +typedef string Path; +typedef list<Path> Paths; +typedef set<Path> PathSet; + + +/* The canonical system name, as returned by config.guess. */ +extern string thisSystem; + + +/* Return an absolutized path, resolving paths relative to the + specified directory, or the current directory otherwise. The path + is also canonicalised. */ +Path absPath(Path path, Path dir = ""); + +/* Canonicalise a path (as in realpath(3)). */ +Path canonPath(const Path & path); + +/* Return the directory part of the given path, i.e., everything + before the final `/'. */ +Path dirOf(const Path & path); + +/* Return the base name of the given path, i.e., everything following + the final `/'. */ +string baseNameOf(const Path & path); + +/* Return true iff the given path exists. */ +bool pathExists(const Path & path); + +/* Delete a path; i.e., in the case of a directory, it is deleted + recursively. Don't use this at home, kids. */ +void deletePath(const Path & path); + +/* Make a path read-only recursively. */ +void makePathReadOnly(const Path & path); + +/* Create a temporary directory. */ +Path createTempDir(); + + +/* Messages. */ + +typedef enum { + lvlError, + lvlTalkative, + lvlChatty, + lvlDebug, + lvlVomit +} Verbosity; + +extern Verbosity verbosity; /* supress msgs > this */ + +class Nest +{ +private: + bool nest; +public: + Nest(); + ~Nest(); + void open(Verbosity level, const format & f); +}; + +void printMsg_(Verbosity level, const format & f); + +#define startNest(varName, level, f) \ + Nest varName; \ + if (level <= verbosity) { \ + varName.open(level, (f)); \ + } + +#define printMsg(level, f) \ + do { \ + if (level <= verbosity) { \ + printMsg_(level, (f)); \ + } \ + } while (0) + +#define debug(f) printMsg(lvlDebug, f) + + +/* Wrappers arount read()/write() that read/write exactly the + requested number of bytes. */ +void readFull(int fd, unsigned char * buf, size_t count); +void writeFull(int fd, const unsigned char * buf, size_t count); + + +/* Automatic cleanup of resources. */ + +class AutoDelete +{ + string path; + bool del; +public: + AutoDelete(const string & p); + ~AutoDelete(); + void cancel(); +}; + +class AutoCloseFD +{ + int fd; +public: + AutoCloseFD(); + AutoCloseFD(int fd); + ~AutoCloseFD(); + void operator =(int fd); + operator int(); +}; + +class AutoCloseDir +{ + DIR * dir; +public: + AutoCloseDir(); + AutoCloseDir(DIR * dir); + ~AutoCloseDir(); + void operator =(DIR * dir); + operator DIR *(); +}; + + +#endif /* !__UTIL_H */ |