-// Includes /*{{{*/
+// Copyright (c) 2014 Anthony Towns
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+
+#include <config.h>
+
#include <apt-pkg/fileutl.h>
#include <apt-pkg/mmap.h>
#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/hashes.h>
+#include <apt-pkg/configuration.h>
-#include <sys/stat.h>
-#include <sys/uio.h>
-#include <unistd.h>
-#include <utime.h>
+#include <string>
+#include <list>
+#include <vector>
+#include <iterator>
+
+#include <fcntl.h>
+#include <assert.h>
#include <stdio.h>
-#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
#include <apti18n.h>
- /*}}}*/
-/** \brief RredMethod - ed-style incremential patch method {{{
- *
- * This method implements a patch functionality similar to "patch --ed" that is
- * used by the "tiffany" incremental packages download stuff. It differs from
- * "ed" insofar that it is way more restricted (and therefore secure).
- * The currently supported ed commands are "<em>c</em>hange", "<em>a</em>dd" and
- * "<em>d</em>elete" (diff doesn't output any other).
- * Additionally the records must be reverse sorted by line number and
- * may not overlap (diff *seems* to produce this kind of output).
- * */
-class RredMethod : public pkgAcqMethod {
- bool Debug;
- // the size of this doesn't really matter (except for performance)
- const static int BUF_SIZE = 1024;
- // the supported ed commands
- enum Mode {MODE_CHANGED='c', MODE_DELETED='d', MODE_ADDED='a'};
- // return values
- enum State {ED_OK, ED_ORDERING, ED_PARSER, ED_FAILURE, MMAP_FAILED};
-
- State applyFile(FILE *ed_cmds, FILE *in_file, FILE *out_file,
- unsigned long &line, char *buffer, Hashes *hash) const;
- void ignoreLineInFile(FILE *fin, char *buffer) const;
- void copyLinesFromFileToFile(FILE *fin, FILE *fout, unsigned int lines,
- Hashes *hash, char *buffer) const;
-
- State patchFile(FileFd &Patch, FileFd &From, FileFd &out_file, Hashes *hash) const;
- State patchMMap(FileFd &Patch, FileFd &From, FileFd &out_file, Hashes *hash) const;
-
-protected:
- // the methods main method
- virtual bool Fetch(FetchItem *Itm);
-
-public:
- RredMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
+
+#define BLOCK_SIZE (512*1024)
+
+class MemBlock {
+ char *start;
+ size_t size;
+ char *free;
+ struct MemBlock *next;
+
+ MemBlock(size_t size) : size(size), next(NULL)
+ {
+ free = start = new char[size];
+ }
+
+ size_t avail(void) { return size - (free - start); }
+
+ public:
+
+ MemBlock(void) {
+ free = start = new char[BLOCK_SIZE];
+ size = BLOCK_SIZE;
+ next = NULL;
+ }
+
+ ~MemBlock() {
+ delete [] start;
+ delete next;
+ }
+
+ void clear(void) {
+ free = start;
+ if (next)
+ next->clear();
+ }
+
+ char *add_easy(char *src, size_t len, char *last)
+ {
+ if (last) {
+ for (MemBlock *k = this; k; k = k->next) {
+ if (k->free == last) {
+ if (len <= k->avail()) {
+ char *n = k->add(src, len);
+ assert(last == n);
+ if (last == n)
+ return NULL;
+ return n;
+ } else {
+ break;
+ }
+ } else if (last >= start && last < free) {
+ break;
+ }
+ }
+ }
+ return add(src, len);
+ }
+
+ char *add(char *src, size_t len) {
+ if (len > avail()) {
+ if (!next) {
+ if (len > BLOCK_SIZE) {
+ next = new MemBlock(len);
+ } else {
+ next = new MemBlock;
+ }
+ }
+ return next->add(src, len);
+ }
+ char *dst = free;
+ free += len;
+ memcpy(dst, src, len);
+ return dst;
+ }
};
- /*}}}*/
-/** \brief applyFile - in reverse order with a tail recursion {{{
- *
- * As it is expected that the commands are in reversed order in the patch file
- * we check in the first half if the command is valid, but doesn't execute it
- * and move a step deeper. After reaching the end of the file we apply the
- * patches in the correct order: last found command first.
- *
- * \param ed_cmds patch file to apply
- * \param in_file base file we want to patch
- * \param out_file file to write the patched result to
- * \param line of command operation
- * \param buffer internal used read/write buffer
- * \param hash the created file for correctness
- * \return the success State of the ed command executor
- */
-RredMethod::State RredMethod::applyFile(FILE *ed_cmds, FILE *in_file, FILE *out_file,
- unsigned long &line, char *buffer, Hashes *hash) const {
- // get the current command and parse it
- if (fgets(buffer, BUF_SIZE, ed_cmds) == NULL) {
- if (Debug == true)
- std::clog << "rred: encounter end of file - we can start patching now." << std::endl;
- line = 0;
- return ED_OK;
- }
-
- // parse in the effected linenumbers
- char* idx;
- errno=0;
- unsigned long const startline = strtol(buffer, &idx, 10);
- if (errno == ERANGE || errno == EINVAL) {
- _error->Errno("rred", "startline is an invalid number");
- return ED_PARSER;
- }
- if (startline > line) {
- _error->Error("rred: The start line (%lu) of the next command is higher than the last line (%lu). This is not allowed.", startline, line);
- return ED_ORDERING;
- }
- unsigned long stopline;
- if (*idx == ',') {
- idx++;
- errno=0;
- stopline = strtol(idx, &idx, 10);
- if (errno == ERANGE || errno == EINVAL) {
- _error->Errno("rred", "stopline is an invalid number");
- return ED_PARSER;
- }
- }
- else {
- stopline = startline;
- }
- line = startline;
-
- // which command to execute on this line(s)?
- switch (*idx) {
- case MODE_CHANGED:
- if (Debug == true)
- std::clog << "Change from line " << startline << " to " << stopline << std::endl;
- break;
- case MODE_ADDED:
- if (Debug == true)
- std::clog << "Insert after line " << startline << std::endl;
- break;
- case MODE_DELETED:
- if (Debug == true)
- std::clog << "Delete from line " << startline << " to " << stopline << std::endl;
- break;
- default:
- _error->Error("rred: Unknown ed command '%c'. Abort.", *idx);
- return ED_PARSER;
- }
- unsigned char mode = *idx;
-
- // save the current position
- unsigned const long pos = ftell(ed_cmds);
-
- // if this is add or change then go to the next full stop
- unsigned int data_length = 0;
- if (mode == MODE_CHANGED || mode == MODE_ADDED) {
- do {
- ignoreLineInFile(ed_cmds, buffer);
- data_length++;
- }
- while (strncmp(buffer, ".", 1) != 0);
- data_length--; // the dot should not be copied
- }
-
- // do the recursive call - the last command is the one we need to execute at first
- const State child = applyFile(ed_cmds, in_file, out_file, line, buffer, hash);
- if (child != ED_OK) {
- return child;
- }
-
- // change and delete are working on "line" - add is done after "line"
- if (mode != MODE_ADDED)
- line++;
-
- // first wind to the current position and copy over all unchanged lines
- if (line < startline) {
- copyLinesFromFileToFile(in_file, out_file, (startline - line), hash, buffer);
- line = startline;
- }
-
- if (mode != MODE_ADDED)
- line--;
-
- // include data from ed script
- if (mode == MODE_CHANGED || mode == MODE_ADDED) {
- fseek(ed_cmds, pos, SEEK_SET);
- copyLinesFromFileToFile(ed_cmds, out_file, data_length, hash, buffer);
- }
-
- // ignore the corresponding number of lines from input
- if (mode == MODE_CHANGED || mode == MODE_DELETED) {
- while (line < stopline) {
- ignoreLineInFile(in_file, buffer);
- line++;
- }
- }
- return ED_OK;
-}
- /*}}}*/
-void RredMethod::copyLinesFromFileToFile(FILE *fin, FILE *fout, unsigned int lines,/*{{{*/
- Hashes *hash, char *buffer) const {
- while (0 < lines--) {
- do {
- fgets(buffer, BUF_SIZE, fin);
- size_t const written = fwrite(buffer, 1, strlen(buffer), fout);
- hash->Add((unsigned char*)buffer, written);
- } while (strlen(buffer) == (BUF_SIZE - 1) &&
- buffer[BUF_SIZE - 2] != '\n');
- }
-}
- /*}}}*/
-void RredMethod::ignoreLineInFile(FILE *fin, char *buffer) const { /*{{{*/
- fgets(buffer, BUF_SIZE, fin);
- while (strlen(buffer) == (BUF_SIZE - 1) &&
- buffer[BUF_SIZE - 2] != '\n') {
- fgets(buffer, BUF_SIZE, fin);
- buffer[0] = ' ';
- }
-}
- /*}}}*/
-RredMethod::State RredMethod::patchFile(FileFd &Patch, FileFd &From, /*{{{*/
- FileFd &out_file, Hashes *hash) const {
- char buffer[BUF_SIZE];
- FILE* fFrom = fdopen(From.Fd(), "r");
- FILE* fPatch = fdopen(Patch.Fd(), "r");
- FILE* fTo = fdopen(out_file.Fd(), "w");
-
- /* we do a tail recursion to read the commands in the right order */
- unsigned long line = -1; // assign highest possible value
- State const result = applyFile(fPatch, fFrom, fTo, line, buffer, hash);
-
- /* read the rest from infile */
- if (result == ED_OK) {
- while (fgets(buffer, BUF_SIZE, fFrom) != NULL) {
- size_t const written = fwrite(buffer, 1, strlen(buffer), fTo);
- hash->Add((unsigned char*)buffer, written);
+
+struct Change {
+ /* Ordering:
+ *
+ * 1. write out <offset> lines unchanged
+ * 2. skip <del_cnt> lines from source
+ * 3. write out <add_cnt> lines (<add>/<add_len>)
+ */
+ size_t offset;
+ size_t del_cnt;
+ size_t add_cnt; /* lines */
+ size_t add_len; /* bytes */
+ char *add;
+
+ Change(int off)
+ {
+ offset = off;
+ del_cnt = add_cnt = add_len = 0;
+ add = NULL;
+ }
+
+ /* actually, don't write <lines> lines from <add> */
+ void skip_lines(size_t lines)
+ {
+ while (lines > 0) {
+ char *s = (char*) memchr(add, '\n', add_len);
+ assert(s != NULL);
+ s++;
+ add_len -= (s - add);
+ add_cnt--;
+ lines--;
+ if (add_len == 0) {
+ add = NULL;
+ assert(add_cnt == 0);
+ assert(lines == 0);
+ } else {
+ add = s;
+ assert(add_cnt > 0);
+ }
}
- fflush(fTo);
}
- return result;
-}
- /*}}}*/
-struct EdCommand { /*{{{*/
- size_t data_start;
- size_t data_end;
- size_t data_lines;
- size_t first_line;
- size_t last_line;
- char type;
};
-#define IOV_COUNT 1024 /* Don't really want IOV_MAX since it can be arbitrarily large */
- /*}}}*/
-RredMethod::State RredMethod::patchMMap(FileFd &Patch, FileFd &From, /*{{{*/
- FileFd &out_file, Hashes *hash) const {
-#ifdef _POSIX_MAPPED_FILES
- MMap ed_cmds(Patch, MMap::ReadOnly);
- MMap in_file(From, MMap::ReadOnly);
-
- if (ed_cmds.Size() == 0 || in_file.Size() == 0)
- return MMAP_FAILED;
-
- EdCommand* commands = 0;
- size_t command_count = 0;
- size_t command_alloc = 0;
-
- const char* begin = (char*) ed_cmds.Data();
- const char* end = begin;
- const char* ed_end = (char*) ed_cmds.Data() + ed_cmds.Size();
-
- const char* input = (char*) in_file.Data();
- const char* input_end = (char*) in_file.Data() + in_file.Size();
-
- size_t i;
-
- /* 1. Parse entire script. It is executed in reverse order, so we cather it
- * in the `commands' buffer first
- */
-
- for(;;) {
- EdCommand cmd;
- cmd.data_start = 0;
- cmd.data_end = 0;
-
- while(begin != ed_end && *begin == '\n')
- ++begin;
- while(end != ed_end && *end != '\n')
- ++end;
- if(end == ed_end && begin == end)
- break;
-
- /* Determine command range */
- const char* tmp = begin;
-
- for(;;) {
- /* atoll is safe despite lacking NUL-termination; we know there's an
- * alphabetic character at end[-1]
- */
- if(tmp == end) {
- cmd.first_line = atol(begin);
- cmd.last_line = cmd.first_line;
- break;
- }
- if(*tmp == ',') {
- cmd.first_line = atol(begin);
- cmd.last_line = atol(tmp + 1);
- break;
- }
- ++tmp;
- }
-
- // which command to execute on this line(s)?
- switch (end[-1]) {
- case MODE_CHANGED:
- if (Debug == true)
- std::clog << "Change from line " << cmd.first_line << " to " << cmd.last_line << std::endl;
- break;
- case MODE_ADDED:
- if (Debug == true)
- std::clog << "Insert after line " << cmd.first_line << std::endl;
- break;
- case MODE_DELETED:
- if (Debug == true)
- std::clog << "Delete from line " << cmd.first_line << " to " << cmd.last_line << std::endl;
- break;
- default:
- _error->Error("rred: Unknown ed command '%c'. Abort.", end[-1]);
- free(commands);
- return ED_PARSER;
- }
- cmd.type = end[-1];
-
- /* Determine the size of the inserted text, so we don't have to scan this
- * text again later.
- */
- begin = end + 1;
- end = begin;
- cmd.data_lines = 0;
-
- if(cmd.type == MODE_ADDED || cmd.type == MODE_CHANGED) {
- cmd.data_start = begin - (char*) ed_cmds.Data();
- while(end != ed_end) {
- if(*end == '\n') {
- if(end[-1] == '.' && end[-2] == '\n')
- break;
- ++cmd.data_lines;
- }
- ++end;
- }
- cmd.data_end = end - (char*) ed_cmds.Data() - 1;
- begin = end + 1;
- end = begin;
- }
- if(command_count == command_alloc) {
- command_alloc = (command_alloc + 64) * 3 / 2;
- commands = (EdCommand*) realloc(commands, command_alloc * sizeof(EdCommand));
- }
- commands[command_count++] = cmd;
- }
-
- struct iovec* iov = new struct iovec[IOV_COUNT];
- size_t iov_size = 0;
-
- size_t amount, remaining;
- size_t line = 1;
- EdCommand* cmd;
-
- /* 2. Execute script. We gather writes in a `struct iov' array, and flush
- * using writev to minimize the number of system calls. Data is read
- * directly from the memory mappings of the input file and the script.
- */
-
- for(i = command_count; i-- > 0; ) {
- cmd = &commands[i];
- if(cmd->type == MODE_ADDED)
- amount = cmd->first_line + 1;
- else
- amount = cmd->first_line;
-
- if(line < amount) {
- begin = input;
- while(line != amount) {
- input = (const char*) memchr(input, '\n', input_end - input);
- if(!input)
- break;
- ++line;
- ++input;
- }
-
- iov[iov_size].iov_base = (void*) begin;
- iov[iov_size].iov_len = input - begin;
- hash->Add((const unsigned char*) begin, input - begin);
-
- if(++iov_size == IOV_COUNT) {
- writev(out_file.Fd(), iov, IOV_COUNT);
- iov_size = 0;
- }
- }
-
- if(cmd->type == MODE_DELETED || cmd->type == MODE_CHANGED) {
- remaining = (cmd->last_line - cmd->first_line) + 1;
- line += remaining;
- while(remaining) {
- input = (const char*) memchr(input, '\n', input_end - input);
- if(!input)
- break;
- --remaining;
- ++input;
- }
- }
-
- if(cmd->type == MODE_CHANGED || cmd->type == MODE_ADDED) {
- if(cmd->data_end != cmd->data_start) {
- iov[iov_size].iov_base = (void*) ((char*)ed_cmds.Data() + cmd->data_start);
- iov[iov_size].iov_len = cmd->data_end - cmd->data_start;
- hash->Add((const unsigned char*) ((char*)ed_cmds.Data() + cmd->data_start),
- iov[iov_size].iov_len);
-
- if(++iov_size == IOV_COUNT) {
- writev(out_file.Fd(), iov, IOV_COUNT);
- iov_size = 0;
- }
- }
- }
- }
-
- if(input != input_end) {
- iov[iov_size].iov_base = (void*) input;
- iov[iov_size].iov_len = input_end - input;
- hash->Add((const unsigned char*) input, input_end - input);
- ++iov_size;
- }
-
- if(iov_size) {
- writev(out_file.Fd(), iov, iov_size);
- iov_size = 0;
- }
-
- for(i = 0; i < iov_size; i += IOV_COUNT) {
- if(iov_size - i < IOV_COUNT)
- writev(out_file.Fd(), iov + i, iov_size - i);
- else
- writev(out_file.Fd(), iov + i, IOV_COUNT);
- }
-
- delete [] iov;
- free(commands);
-
- return ED_OK;
+
+class FileChanges {
+ std::list<struct Change> changes;
+ std::list<struct Change>::iterator where;
+ size_t pos; // line number is as far left of iterator as possible
+
+ bool pos_is_okay(void)
+ {
+#ifdef POSDEBUG
+ size_t cpos = 0;
+ std::list<struct Change>::iterator x;
+ for (x = changes.begin(); x != where; ++x) {
+ assert(x != changes.end());
+ cpos += x->offset + x->add_cnt;
+ }
+ return cpos == pos;
#else
- return MMAP_FAILED;
+ return true;
#endif
-}
- /*}}}*/
-bool RredMethod::Fetch(FetchItem *Itm) /*{{{*/
-{
- Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
- URI Get = Itm->Uri;
- string Path = Get.Host + Get.Path; // To account for relative paths
-
- FetchResult Res;
- Res.Filename = Itm->DestFile;
- if (Itm->Uri.empty() == true) {
- Path = Itm->DestFile;
- Itm->DestFile.append(".result");
- } else
- URIStart(Res);
-
- if (Debug == true)
- std::clog << "Patching " << Path << " with " << Path
- << ".ed and putting result into " << Itm->DestFile << std::endl;
- // Open the source and destination files (the d'tor of FileFd will do
- // the cleanup/closing of the fds)
- FileFd From(Path,FileFd::ReadOnly);
- FileFd Patch(Path+".ed",FileFd::ReadOnly);
- FileFd To(Itm->DestFile,FileFd::WriteEmpty);
- To.EraseOnFailure();
- if (_error->PendingError() == true)
- return false;
-
- Hashes Hash;
- // now do the actual patching
- State const result = patchMMap(Patch, From, To, &Hash);
- if (result == MMAP_FAILED) {
- // retry with patchFile
- lseek(Patch.Fd(), 0, SEEK_SET);
- lseek(From.Fd(), 0, SEEK_SET);
- To.Open(Itm->DestFile,FileFd::WriteEmpty);
- if (_error->PendingError() == true)
- return false;
- if (patchFile(Patch, From, To, &Hash) != ED_OK) {
- return _error->WarningE("rred", _("Could not patch %s with mmap and with file operation usage - the patch seems to be corrupt."), Path.c_str());
- } else if (Debug == true) {
- std::clog << "rred: finished file patching of " << Path << " after mmap failed." << std::endl;
+ }
+
+ public:
+ FileChanges() {
+ where = changes.end();
+ pos = 0;
+ }
+
+ std::list<struct Change>::iterator begin(void) { return changes.begin(); }
+ std::list<struct Change>::iterator end(void) { return changes.end(); }
+
+ std::list<struct Change>::reverse_iterator rbegin(void) { return changes.rbegin(); }
+ std::list<struct Change>::reverse_iterator rend(void) { return changes.rend(); }
+
+ void add_change(Change c) {
+ assert(pos_is_okay());
+ go_to_change_for(c.offset);
+ assert(pos + where->offset == c.offset);
+ if (c.del_cnt > 0)
+ delete_lines(c.del_cnt);
+ assert(pos + where->offset == c.offset);
+ if (c.add_len > 0) {
+ assert(pos_is_okay());
+ if (where->add_len > 0)
+ new_change();
+ assert(where->add_len == 0 && where->add_cnt == 0);
+
+ where->add_len = c.add_len;
+ where->add_cnt = c.add_cnt;
+ where->add = c.add;
}
- } else if (result != ED_OK) {
- return _error->Errno("rred", _("Could not patch %s with mmap (but no mmap specific fail) - the patch seems to be corrupt."), Path.c_str());
- } else if (Debug == true) {
- std::clog << "rred: finished mmap patching of " << Path << std::endl;
+ assert(pos_is_okay());
+ merge();
+ assert(pos_is_okay());
}
- // write out the result
- From.Close();
- Patch.Close();
- To.Close();
-
- /* Transfer the modification times from the patch file
- to be able to see in which state the file should be
- and use the access time from the "old" file */
- struct stat BufBase, BufPatch;
- if (stat(Path.c_str(),&BufBase) != 0 ||
- stat(string(Path+".ed").c_str(),&BufPatch) != 0)
- return _error->Errno("stat",_("Failed to stat"));
-
- struct utimbuf TimeBuf;
- TimeBuf.actime = BufBase.st_atime;
- TimeBuf.modtime = BufPatch.st_mtime;
- if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
- return _error->Errno("utime",_("Failed to set modification time"));
-
- if (stat(Itm->DestFile.c_str(),&BufBase) != 0)
- return _error->Errno("stat",_("Failed to stat"));
-
- // return done
- Res.LastModified = BufBase.st_mtime;
- Res.Size = BufBase.st_size;
- Res.TakeHashes(Hash);
- URIDone(Res);
-
- return true;
-}
- /*}}}*/
-/** \brief Wrapper class for testing rred */ /*{{{*/
-class TestRredMethod : public RredMethod {
-public:
- /** \brief Run rred in debug test mode
- *
- * This method can be used to run the rred method outside
- * of the "normal" acquire environment for easier testing.
- *
- * \param base basename of all files involved in this rred test
- */
- bool Run(char const *base) {
- _config->CndSet("Debug::pkgAcquire::RRed", "true");
- FetchItem *test = new FetchItem;
- test->DestFile = base;
- return Fetch(test);
- }
+ private:
+ void merge(void)
+ {
+ while (where->offset == 0 && where != changes.begin()) {
+ left();
+ }
+ std::list<struct Change>::iterator next = where;
+ ++next;
+
+ while (next != changes.end() && next->offset == 0) {
+ where->del_cnt += next->del_cnt;
+ next->del_cnt = 0;
+ if (next->add == NULL) {
+ next = changes.erase(next);
+ } else if (where->add == NULL) {
+ where->add = next->add;
+ where->add_len = next->add_len;
+ where->add_cnt = next->add_cnt;
+ next = changes.erase(next);
+ } else {
+ ++next;
+ }
+ }
+ }
+
+ void go_to_change_for(size_t line)
+ {
+ while(where != changes.end()) {
+ if (line < pos) {
+ left();
+ continue;
+ }
+ if (pos + where->offset + where->add_cnt <= line) {
+ right();
+ continue;
+ }
+ // line is somewhere in this slot
+ if (line < pos + where->offset) {
+ break;
+ } else if (line == pos + where->offset) {
+ return;
+ } else {
+ split(line - pos);
+ right();
+ return;
+ }
+ }
+ /* it goes before this patch */
+ insert(line-pos);
+ }
+
+ void new_change(void) { insert(where->offset); }
+
+ void insert(size_t offset)
+ {
+ assert(pos_is_okay());
+ assert(where == changes.end() || offset <= where->offset);
+ if (where != changes.end())
+ where->offset -= offset;
+ changes.insert(where, Change(offset));
+ --where;
+ assert(pos_is_okay());
+ }
+
+ void split(size_t offset)
+ {
+ assert(pos_is_okay());
+
+ assert(where->offset < offset);
+ assert(offset < where->offset + where->add_cnt);
+
+ size_t keep_lines = offset - where->offset;
+
+ Change before(*where);
+
+ where->del_cnt = 0;
+ where->offset = 0;
+ where->skip_lines(keep_lines);
+
+ before.add_cnt = keep_lines;
+ before.add_len -= where->add_len;
+
+ changes.insert(where, before);
+ --where;
+ assert(pos_is_okay());
+ }
+
+ void delete_lines(size_t cnt)
+ {
+ std::list<struct Change>::iterator x = where;
+ assert(pos_is_okay());
+ while (cnt > 0)
+ {
+ size_t del;
+ del = x->add_cnt;
+ if (del > cnt)
+ del = cnt;
+ x->skip_lines(del);
+ cnt -= del;
+
+ ++x;
+ if (x == changes.end()) {
+ del = cnt;
+ } else {
+ del = x->offset;
+ if (del > cnt)
+ del = cnt;
+ x->offset -= del;
+ }
+ where->del_cnt += del;
+ cnt -= del;
+ }
+ assert(pos_is_okay());
+ }
+
+ void left(void) {
+ assert(pos_is_okay());
+ --where;
+ pos -= where->offset + where->add_cnt;
+ assert(pos_is_okay());
+ }
+
+ void right(void) {
+ assert(pos_is_okay());
+ pos += where->offset + where->add_cnt;
+ ++where;
+ assert(pos_is_okay());
+ }
};
- /*}}}*/
-/** \brief Starter for the rred method (or its test method) {{{
- *
- * Used without parameters is the normal behavior for methods for
- * the APT acquire system. While this works great for the acquire system
- * it is very hard to test the method and therefore the method also
- * accepts one parameter which will switch it directly to debug test mode:
- * The test mode expects that if "Testfile" is given as parameter
- * the file "Testfile" should be ed-style patched with "Testfile.ed"
- * and will write the result to "Testfile.result".
- */
-int main(int argc, char *argv[]) {
- if (argc <= 1) {
- RredMethod Mth;
- return Mth.Run();
- } else {
- TestRredMethod Mth;
- bool result = Mth.Run(argv[1]);
- _error->DumpErrors();
- return result;
- }
+
+class Patch {
+ FileChanges filechanges;
+ MemBlock add_text;
+
+ static bool retry_fwrite(char *b, size_t l, FILE *f, Hashes *hash)
+ {
+ size_t r = 1;
+ while (r > 0 && l > 0)
+ {
+ r = fwrite(b, 1, l, f);
+ if (hash)
+ hash->Add((unsigned char*)b, r);
+ l -= r;
+ b += r;
+ }
+ return l == 0;
+ }
+
+ static void dump_rest(FILE *o, FILE *i, Hashes *hash)
+ {
+ char buffer[BLOCK_SIZE];
+ size_t l;
+ while (0 < (l = fread(buffer, 1, sizeof(buffer), i))) {
+ if (!retry_fwrite(buffer, l, o, hash))
+ break;
+ }
+ }
+
+ static void dump_lines(FILE *o, FILE *i, size_t n, Hashes *hash)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ retry_fwrite(buffer, l, o, hash);
+ }
+ }
+
+ static void skip_lines(FILE *i, int n)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ }
+ }
+
+ static void dump_mem(FILE *o, char *p, size_t s, Hashes *hash) {
+ retry_fwrite(p, s, o, hash);
+ }
+
+ public:
+
+ void read_diff(FileFd &f)
+ {
+ char buffer[BLOCK_SIZE];
+ bool cmdwanted = true;
+
+ Change ch(0);
+ while(f.ReadLine(buffer, sizeof(buffer)))
+ {
+ if (cmdwanted) {
+ char *m, *c;
+ size_t s, e;
+ s = strtol(buffer, &m, 10);
+ if (m == buffer) {
+ s = e = ch.offset + ch.add_cnt;
+ c = buffer;
+ } else if (*m == ',') {
+ m++;
+ e = strtol(m, &c, 10);
+ } else {
+ e = s;
+ c = m;
+ }
+ switch(*c) {
+ case 'a':
+ cmdwanted = false;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ ch.offset = s;
+ ch.del_cnt = 0;
+ break;
+ case 'c':
+ cmdwanted = false;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ ch.offset = s - 1;
+ ch.del_cnt = e - s + 1;
+ break;
+ case 'd':
+ ch.offset = s - 1;
+ ch.del_cnt = e - s + 1;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ filechanges.add_change(ch);
+ break;
+ }
+ } else { /* !cmdwanted */
+ if (buffer[0] == '.' && buffer[1] == '\n') {
+ cmdwanted = true;
+ filechanges.add_change(ch);
+ } else {
+ char *last = NULL;
+ char *add;
+ size_t l;
+ if (ch.add)
+ last = ch.add + ch.add_len;
+ l = strlen(buffer);
+ add = add_text.add_easy(buffer, l, last);
+ if (!add) {
+ ch.add_len += l;
+ ch.add_cnt++;
+ } else {
+ if (ch.add) {
+ filechanges.add_change(ch);
+ ch.del_cnt = 0;
+ }
+ ch.offset += ch.add_cnt;
+ ch.add = add;
+ ch.add_len = l;
+ ch.add_cnt = 1;
+ }
+ }
+ }
+ }
+ }
+
+ void write_diff(FILE *f)
+ {
+ size_t line = 0;
+ std::list<struct Change>::reverse_iterator ch;
+ for (ch = filechanges.rbegin(); ch != filechanges.rend(); ++ch) {
+ line += ch->offset + ch->del_cnt;
+ }
+
+ for (ch = filechanges.rbegin(); ch != filechanges.rend(); ++ch) {
+ std::list<struct Change>::reverse_iterator mg_i, mg_e = ch;
+ while (ch->del_cnt == 0 && ch->offset == 0)
+ ++ch;
+ line -= ch->del_cnt;
+ if (ch->add_cnt > 0) {
+ if (ch->del_cnt == 0) {
+ fprintf(f, "%lua\n", line);
+ } else if (ch->del_cnt == 1) {
+ fprintf(f, "%luc\n", line+1);
+ } else {
+ fprintf(f, "%lu,%luc\n", line+1, line+ch->del_cnt);
+ }
+
+ mg_i = ch;
+ do {
+ dump_mem(f, mg_i->add, mg_i->add_len, NULL);
+ } while (mg_i-- != mg_e);
+
+ fprintf(f, ".\n");
+ } else if (ch->del_cnt == 1) {
+ fprintf(f, "%lud\n", line+1);
+ } else if (ch->del_cnt > 1) {
+ fprintf(f, "%lu,%lud\n", line+1, line+ch->del_cnt);
+ }
+ line -= ch->offset;
+ }
+ }
+
+ void apply_against_file(FILE *out, FILE *in, Hashes *hash = NULL)
+ {
+ std::list<struct Change>::iterator ch;
+ for (ch = filechanges.begin(); ch != filechanges.end(); ++ch) {
+ dump_lines(out, in, ch->offset, hash);
+ skip_lines(in, ch->del_cnt);
+ dump_mem(out, ch->add, ch->add_len, hash);
+ }
+ dump_rest(out, in, hash);
+ }
+};
+
+class RredMethod : public pkgAcqMethod {
+ private:
+ bool Debug;
+
+ protected:
+ virtual bool Fetch(FetchItem *Itm) {
+ Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
+ URI Get = Itm->Uri;
+ std::string Path = Get.Host + Get.Path; // rred:/path - no host
+
+ FetchResult Res;
+ Res.Filename = Itm->DestFile;
+ if (Itm->Uri.empty())
+ {
+ Path = Itm->DestFile;
+ Itm->DestFile.append(".result");
+ } else
+ URIStart(Res);
+
+ std::vector<std::string> patchpaths;
+ Patch patch;
+
+ if (FileExists(Path + ".ed") == true)
+ patchpaths.push_back(Path + ".ed");
+ else
+ {
+ _error->PushToStack();
+ std::vector<std::string> patches = GetListOfFilesInDir(flNotFile(Path), "gz", true, false);
+ _error->RevertToStack();
+
+ std::string const baseName = Path + ".ed.";
+ for (std::vector<std::string>::const_iterator p = patches.begin();
+ p != patches.end(); ++p)
+ if (p->compare(0, baseName.length(), baseName) == 0)
+ patchpaths.push_back(*p);
+ }
+
+ std::string patch_name;
+ for (std::vector<std::string>::iterator I = patchpaths.begin();
+ I != patchpaths.end();
+ ++I)
+ {
+ patch_name = *I;
+ if (Debug == true)
+ std::clog << "Patching " << Path << " with " << patch_name
+ << std::endl;
+
+ FileFd p;
+ // all patches are compressed, even if the name doesn't reflect it
+ if (p.Open(patch_name, FileFd::ReadOnly, FileFd::Gzip) == false) {
+ std::cerr << "Could not open patch file " << patch_name << std::endl;
+ _error->DumpErrors(std::cerr);
+ abort();
+ }
+ patch.read_diff(p);
+ p.Close();
+ }
+
+ if (Debug == true)
+ std::clog << "Applying patches against " << Path
+ << " and writing results to " << Itm->DestFile
+ << std::endl;
+
+ FILE *inp = fopen(Path.c_str(), "r");
+ FILE *out = fopen(Itm->DestFile.c_str(), "w");
+
+ Hashes hash;
+
+ patch.apply_against_file(out, inp, &hash);
+
+ fclose(out);
+ fclose(inp);
+
+ if (Debug == true) {
+ std::clog << "rred: finished file patching of " << Path << "." << std::endl;
+ }
+
+ struct stat bufbase, bufpatch;
+ if (stat(Path.c_str(), &bufbase) != 0 ||
+ stat(patch_name.c_str(), &bufpatch) != 0)
+ return _error->Errno("stat", _("Failed to stat"));
+
+ struct timeval times[2];
+ times[0].tv_sec = bufbase.st_atime;
+ times[1].tv_sec = bufpatch.st_mtime;
+ times[0].tv_usec = times[1].tv_usec = 0;
+ if (utimes(Itm->DestFile.c_str(), times) != 0)
+ return _error->Errno("utimes",_("Failed to set modification time"));
+
+ if (stat(Itm->DestFile.c_str(), &bufbase) != 0)
+ return _error->Errno("stat", _("Failed to stat"));
+
+ Res.LastModified = bufbase.st_mtime;
+ Res.Size = bufbase.st_size;
+ Res.TakeHashes(hash);
+ URIDone(Res);
+
+ return true;
+ }
+
+ public:
+ RredMethod() : pkgAcqMethod("2.0",SingleInstance | SendConfig), Debug(false) {}
+};
+
+int main(int argc, char **argv)
+{
+ int i;
+ bool just_diff = true;
+ Patch patch;
+
+ if (argc <= 1) {
+ RredMethod Mth;
+ return Mth.Run();
+ }
+
+ if (argc > 1 && strcmp(argv[1], "-f") == 0) {
+ just_diff = false;
+ i = 2;
+ } else {
+ i = 1;
+ }
+
+ for (; i < argc; i++) {
+ FileFd p;
+ if (p.Open(argv[i], FileFd::ReadOnly) == false) {
+ _error->DumpErrors(std::cerr);
+ exit(1);
+ }
+ patch.read_diff(p);
+ }
+
+ if (just_diff) {
+ patch.write_diff(stdout);
+ } else {
+ FILE *out, *inp;
+ out = stdout;
+ inp = stdin;
+
+ patch.apply_against_file(out, inp);
+ }
+ return 0;
}
- /*}}}*/
projects / apt.git / blobdiff