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#include <apt-pkg/fileutl.h>
#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/hashes.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include <stdio.h>
#include <errno.h>
#include <apti18n.h>
const char *Prog;
class RredMethod : public pkgAcqMethod
{
virtual bool Fetch(FetchItem *Itm);
public:
RredMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
};
#define BUF_SIZE (1024)
// XX use enums
#define MODE_CHANGED 0
#define MODE_DELETED 1
#define MODE_ADDED 2
#define ED_ORDERING 1
#define ED_PARSER 2
#define ED_FAILURE 3
int ed_rec(FILE *ed_cmds, FILE *in_file, FILE *out_file, int line,
char *buffer, unsigned int bufsize, Hashes *hash) {
int pos;
int startline;
int stopline;
int mode;
int written;
char *idx;
/* get the current command and parse it*/
if (fgets(buffer, bufsize, ed_cmds) == NULL) {
return line;
}
startline = strtol(buffer, &idx, 10);
if (startline < line) {
return ED_ORDERING;
}
if (*idx == ',') {
idx++;
stopline = strtol(idx, &idx, 10);
}
else {
stopline = startline;
}
if (*idx == 'c') {
mode = MODE_CHANGED;
}
else if (*idx == 'a') {
mode = MODE_ADDED;
}
else if (*idx == 'd') {
mode = MODE_DELETED;
}
else {
return ED_PARSER;
}
/* get the current position */
pos = ftell(ed_cmds);
/* if this is add or change then go to the next full stop */
if ((mode == MODE_CHANGED) || (mode == MODE_ADDED)) {
do {
fgets(buffer, bufsize, ed_cmds);
while ((strlen(buffer) == (bufsize - 1))
&& (buffer[bufsize - 2] != '\n')) {
fgets(buffer, bufsize, ed_cmds);
buffer[0] = ' ';
}
} while (strncmp(buffer, ".", 1) != 0);
}
/* do the recursive call */
line = ed_rec(ed_cmds, in_file, out_file, line, buffer, bufsize,
hash);
/* pass on errors */
if (line < 0) {
return line;
}
/* apply our hunk */
fseek(ed_cmds, pos, SEEK_SET);
/* first wind to the current position */
if (mode != MODE_ADDED) {
startline -= 1;
}
while (line < startline) {
fgets(buffer, bufsize, in_file);
written = fwrite(buffer, 1, strlen(buffer), out_file);
hash->Add((unsigned char*)buffer, written);
while ((strlen(buffer) == (bufsize - 1))
&& (buffer[bufsize - 2] != '\n')) {
fgets(buffer, bufsize, in_file);
written = fwrite(buffer, 1, strlen(buffer), out_file);
hash->Add((unsigned char*)buffer, written);
}
line++;
}
/* include from ed script */
if ((mode == MODE_ADDED) || (mode == MODE_CHANGED)) {
do {
fgets(buffer, bufsize, ed_cmds);
if (strncmp(buffer, ".", 1) != 0) {
written = fwrite(buffer, 1, strlen(buffer), out_file);
hash->Add((unsigned char*)buffer, written);
while ((strlen(buffer) == (bufsize - 1))
&& (buffer[bufsize - 2] != '\n')) {
fgets(buffer, bufsize, ed_cmds);
written = fwrite(buffer, 1, strlen(buffer), out_file);
hash->Add((unsigned char*)buffer, written);
}
}
else {
break;
}
} while (1);
}
/* ignore the corresponding number of lines from input */
if ((mode == MODE_DELETED) || (mode == MODE_CHANGED)) {
while (line < stopline) {
fgets(buffer, bufsize, in_file);
while ((strlen(buffer) == (bufsize - 1))
&& (buffer[bufsize - 2] != '\n')) {
fgets(buffer, bufsize, in_file);
}
line++;
}
}
return line;
}
int ed_file(FILE *ed_cmds, FILE *in_file, FILE *out_file, Hashes *hash) {
char buffer[BUF_SIZE];
int result;
int written;
/* we do a tail recursion to read the commands in the right order */
result = ed_rec(ed_cmds, in_file, out_file, 0, buffer, BUF_SIZE,
hash);
/* read the rest from infile */
if (result > 0) {
while (fgets(buffer, BUF_SIZE, in_file) != NULL) {
written = fwrite(buffer, 1, strlen(buffer), out_file);
// XXX add to hash
// sha_process_bytes(buffer, written, &sha);
}
}
else {
// XXX better error handling
fprintf(stderr, "Error: %i\n", result);
return ED_FAILURE;
}
return 0;
}
// XXX do we need modification times as well?
bool RredMethod::Fetch(FetchItem *Itm)
{
URI Get = Itm->Uri;
string Path = Get.Host + Get.Path; // To account for relative paths
// Path contains the filename to patch
FetchResult Res;
Res.Filename = Itm->DestFile;
URIStart(Res);
// Res.Filename the destination filename
// Open the source and destination files
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;
FILE* fFrom = fdopen(From.Fd(), "r");
FILE* fPatch = fdopen(Patch.Fd(), "r");
FILE* fTo = fdopen(To.Fd(), "w");
// now do the actual patching
ed_file(fPatch, fFrom, fTo, &Hash);
// clean up
fclose(fFrom);
fclose(fPatch);
fclose(fTo);
To.Close();
From.Close();
Patch.Close();
// XXX need to get the size
// Res.Size = Buf.st_size;
Res.TakeHashes(Hash);
URIDone(Res);
return true;
}
/*}}}*/
int main(int argc, char *argv[])
{
RredMethod Mth;
Prog = strrchr(argv[0],'/');
Prog++;
return Mth.Run();
}
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