- /*}}}*/
-/** \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(FileFd &ed_cmds, FileFd &in_file, FileFd &out_file,
- unsigned long &line, char *buffer, Hashes *hash) const {
- // get the current command and parse it
- if (ed_cmds.ReadLine(buffer, BUF_SIZE) == 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 long pos = ed_cmds.Tell();
-
- // 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) {
- ed_cmds.Seek(pos);
- 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(FileFd &fin, FileFd &fout, unsigned int lines,/*{{{*/
- Hashes *hash, char *buffer) const {
- while (0 < lines--) {
- do {
- fin.ReadLine(buffer, BUF_SIZE);
- unsigned long long const towrite = strlen(buffer);
- fout.Write(buffer, towrite);
- hash->Add((unsigned char*)buffer, towrite);
- } while (strlen(buffer) == (BUF_SIZE - 1) &&
- buffer[BUF_SIZE - 2] != '\n');
- }
-}
- /*}}}*/
-void RredMethod::ignoreLineInFile(FileFd &fin, char *buffer) const { /*{{{*/
- fin.ReadLine(buffer, BUF_SIZE);
- while (strlen(buffer) == (BUF_SIZE - 1) &&
- buffer[BUF_SIZE - 2] != '\n') {
- fin.ReadLine(buffer, BUF_SIZE);
- buffer[0] = ' ';
- }
-}
- /*}}}*/
-RredMethod::State RredMethod::patchFile(FileFd &Patch, FileFd &From, /*{{{*/
- FileFd &out_file, Hashes *hash) const {
- char buffer[BUF_SIZE];
-
- /* 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(Patch, From, out_file, line, buffer, hash);
-
- /* read the rest from infile */
- if (result == ED_OK) {
- while (From.ReadLine(buffer, BUF_SIZE) != NULL) {
- unsigned long long const towrite = strlen(buffer);
- out_file.Write(buffer, towrite);
- hash->Add((unsigned char*)buffer, towrite);
projects / apt.git / blobdiff