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/* hexedit -- Hexadecimal Editor for Binary Files
Copyright (C) 1998 Pixel (Pascal Rigaux)
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, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.*/
#include "hexedit.h"
void openFile(void)
{
struct stat st;
if (!is_file(fileName)) {
fprintf(stderr, "%s: %s: Not a file.\n", progName, fileName);
exit(1);
}
/* edited should be cleaned here (assert(edited == NULL)) */
if ((fd = open(fileName, O_RDWR)) == -1) {
isReadOnly = TRUE;
if ((fd = open(fileName, O_RDONLY)) == -1) {
if (page) exitCurses();
if (fileName[0] == '-') DIE(usage);
fprintf(stderr, "%s: ", progName);
perror(fileName);
exit(1);
}
} else isReadOnly = FALSE;
baseName = basename(fileName);
mark_set = FALSE;
lastEditedLoc = base = cursor = cursorOffset = 0;
/* check file size- doesn't work on devices. I considered implementing a conquer-and-divide algorithm, but it would unpleasant on tape drives and such. */
biggestLoc = fileSize = (fstat(fd, &st) != -1 && st.st_size > 0) ? st.st_size : 0;
/* else biggestLoc = lseek(fd, 0, SEEK_END); *//* doesn't work on any devices I've tried it on, but it might work -somewhere- */
}
void readFile(void)
{
typePage *p;
int i;
memset(buffer, 0, page * sizeof(*buffer));
lseek(fd, base, SEEK_SET);
nbBytes = read(fd, buffer, page);
if (nbBytes < 0)
nbBytes = 0;
else if (nbBytes && base + nbBytes > biggestLoc)
biggestLoc = base + nbBytes;
memset(bufferAttr, A_NORMAL, page * sizeof(*bufferAttr));
for (p = edited; p; p = p->next) {
for (i = MAX(base, p->base); i < MIN(p->base + p->size, base + page); i++) {
if (buffer[i - base] != p->vals[i - p->base]) {
buffer[i - base] = p->vals[i - p->base];
bufferAttr[i - base] |= MODIFIED;
}
}
if (p->base + p->size > base + nbBytes) { /* Check for modifications past EOF */
for(; p->base + p->size > base + nbBytes && nbBytes < page; nbBytes++)
bufferAttr[nbBytes] |= MODIFIED;
}
}
if (mark_set) markSelectedRegion();
}
int findFile(void)
{
char *p, tmp[BLOCK_SEARCH_SIZE];
p = lastFindFile ? strdup(lastFindFile) : NULL;
if (!displayMessageAndGetString("File name: (", &p, tmp)) return FALSE;
if (!is_file(tmp)) return FALSE;
FREE(lastFindFile); lastFindFile = fileName;
fileName = p;
return TRUE;
}
int getfilesize(void)
{
return MAX(lastEditedLoc, biggestLoc);
}
/* tryloc:
* returns TRUE if loc is an apropriate location to place the cursor
* assumes the file won't shrink.
* returns TRUE if the cursor is one past EOF to allow appending
*/
int tryloc(int loc)
{
char c;
if (loc < 0)
return FALSE;
if (loc <= lastEditedLoc)
return TRUE;
if (loc <= biggestLoc)
return TRUE;
lseek(fd, loc - 1, SEEK_SET); /* don't have to worry about loc - 1 < 0 */
if (read(fd, &c, 1) == 1) {
biggestLoc = loc;
return TRUE;
}
return FALSE;
}
int is_file(char *name)
{
struct stat st;
return stat(name, &st) != -1 && !S_ISDIR(st.st_mode);
}
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