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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* fix_win32_filename.c
*
* Copyright (C) 2024 David Oberhollenzer <goliath@infraroot.at>
*/
#include "util/util.h"
#include <string.h>
#include <stdlib.h>
#ifdef _MSC_VER
#define strncasecmp _strnicmp
#define strcasecmp _stricmp
#endif
typedef struct {
size_t used;
size_t available;
char buffer[];
} buffer_t;
static buffer_t *buffer_append(buffer_t *buf, const char *data, size_t count)
{
size_t bufspace, needed;
if (buf == NULL) {
buf = calloc(1, sizeof(*buf) + 128);
if (buf == NULL)
return NULL;
buf->used = 1;
buf->available = 128;
buf->buffer[0] = '\0';
}
bufspace = buf->available;
needed = buf->used + count;
while (bufspace < needed)
bufspace += 128;
if (bufspace != buf->available) {
void *new_buf = realloc(buf, sizeof(*buf) + bufspace);
if (new_buf == NULL) {
free(buf);
return NULL;
}
buf = new_buf;
buf->available = bufspace;
}
buf->used -= 1;
memcpy(buf->buffer + buf->used, data, count);
buf->used += count;
buf->buffer[buf->used++] = '\0';
return buf;
}
static const char *bad_names[] = {
"CON", "PRN", "AUX", "NUL",
"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
};
static buffer_t *handle_component(buffer_t *buf, const char *comp, size_t len)
{
for (size_t i = 0; i < sizeof(bad_names) / sizeof(bad_names[0]); ++i) {
size_t badlen = strlen(bad_names[i]);
if (badlen > len || strncasecmp(comp, bad_names[i], badlen))
continue;
while (badlen < len && comp[badlen] == '_')
++badlen;
if (badlen == len) {
buf = buffer_append(buf, comp, len);
if (buf != NULL)
buf = buffer_append(buf, "_", 1);
return buf;
}
}
while (len > 0) {
sqfs_u8 value, rep[3];
size_t i = 0;
for (i = 0; i < len; ++i) {
if (comp[i] < 0x20 || comp[i] == 0x7F)
break;
if (comp[i] == '<' || comp[i] == '>' || comp[i] == ':')
break;
if (comp[i] == '|' || comp[i] == '?' || comp[i] == '*')
break;
if (comp[i] == '\\' || comp[i] == '\"')
break;
}
if (i > 0) {
buf = buffer_append(buf, comp, i);
if (buf == NULL || i == len)
break;
}
value = comp[i++];
comp += i;
len -= i;
rep[0] = 0xEF;
rep[1] = 0x80 | ((value >> 6) & 0x3f);
rep[2] = 0x80 | ( value & 0x3f);
buf = buffer_append(buf, (const char *)rep, 3);
if (buf == NULL)
break;
}
return buf;
}
static buffer_t *handle_name(buffer_t *buf, const char *name, size_t len)
{
char *sep;
while ((sep = memchr(name, '.', len)) != NULL) {
buf = handle_component(buf, name, sep - name);
if (buf == NULL)
return NULL;
buf = buffer_append(buf, ".", 1);
if (buf == NULL)
return NULL;
len -= sep - name + 1;
name = sep + 1;
}
return handle_component(buf, name, len);
}
char *fix_win32_filename(const char *path)
{
buffer_t *buf = NULL;
char *sep, *out;
size_t len;
while ((sep = strchr(path, '/')) != NULL) {
buf = handle_name(buf, path, sep - path);
if (buf == NULL)
return NULL;
buf = buffer_append(buf, "/", 1);
if (buf == NULL)
return NULL;
path = sep + 1;
}
buf = handle_name(buf, path, strlen(path));
if (buf == NULL)
return NULL;
len = buf->used;
memmove(buf, buf->buffer, len);
out = realloc(buf, len);
if (out == NULL)
out = (char *)buf;
return out;
}
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