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android / platform / external / libcups / 711a9859095ff7309492ceaf172ca95c519355b6 / . / scheduler / type.c
blob: f547b835836b6a49f5a5a1f4344c29ba8b98085f [file] [log] [blame]
/*
* MIME typing routines for CUPS.
*
* Copyright © 2007-2019 by Apple Inc.
* Copyright © 1997-2006 by Easy Software Products, all rights reserved.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#include <cups/string-private.h>
#include <locale.h>
#include "mime.h"
/*
* Debug macros that used to be private API...
*/
#define DEBUG_puts(x)
#define DEBUG_printf(...)
/*
* Local types...
*/
typedef struct _mime_filebuf_s /**** File buffer for MIME typing ****/
{
cups_file_t *fp; /* File pointer */
int offset, /* Offset in file */
length; /* Length of buffered data */
unsigned char buffer[MIME_MAX_BUFFER];/* Buffered data */
} _mime_filebuf_t;
/*
* Local functions...
*/
static int mime_compare_types(mime_type_t *t0, mime_type_t *t1);
static int mime_check_rules(const char *filename, _mime_filebuf_t *fb,
mime_magic_t *rules);
static int mime_patmatch(const char *s, const char *pat);
/*
* Local globals...
*/
#ifdef MIME_DEBUG
static const char * const debug_ops[] =
{ /* Test names... */
"NOP", /* No operation */
"AND", /* Logical AND of all children */
"OR", /* Logical OR of all children */
"MATCH", /* Filename match */
"ASCII", /* ASCII characters in range */
"PRINTABLE", /* Printable characters (32-255) */
"STRING", /* String matches */
"CHAR", /* Character/byte matches */
"SHORT", /* Short/16-bit word matches */
"INT", /* Integer/32-bit word matches */
"LOCALE", /* Current locale matches string */
"CONTAINS", /* File contains a string */
"ISTRING", /* Case-insensitive string matches */
"REGEX" /* Regular expression matches */
};
#endif /* DEBUG */
/*
* 'mimeAddType()' - Add a MIME type to a database.
*/
mime_type_t * /* O - New (or existing) MIME type */
mimeAddType(mime_t *mime, /* I - MIME database */
const char *super, /* I - Super-type name */
const char *type) /* I - Type name */
{
mime_type_t *temp; /* New MIME type */
size_t typelen; /* Length of type name */
DEBUG_printf(("mimeAddType(mime=%p, super=\"%s\", type=\"%s\")", mime, super,
type));
/*
* Range check input...
*/
if (!mime || !super || !type)
{
DEBUG_puts("1mimeAddType: Returning NULL (bad arguments).");
return (NULL);
}
/*
* See if the type already exists; if so, return the existing type...
*/
if ((temp = mimeType(mime, super, type)) != NULL)
{
DEBUG_printf(("1mimeAddType: Returning %p (existing).", temp));
return (temp);
}
/*
* The type doesn't exist; add it...
*/
if (!mime->types)
mime->types = cupsArrayNew((cups_array_func_t)mime_compare_types, NULL);
if (!mime->types)
{
DEBUG_puts("1mimeAddType: Returning NULL (no types).");
return (NULL);
}
typelen = strlen(type) + 1;
if ((temp = calloc(1, sizeof(mime_type_t) - MIME_MAX_TYPE + typelen)) == NULL)
{
DEBUG_puts("1mimeAddType: Returning NULL (out of memory).");
return (NULL);
}
strlcpy(temp->super, super, sizeof(temp->super));
memcpy(temp->type, type, typelen);
temp->priority = 100;
cupsArrayAdd(mime->types, temp);
DEBUG_printf(("1mimeAddType: Returning %p (new).", temp));
return (temp);
}
/*
* 'mimeAddTypeRule()' - Add a detection rule for a file type.
*/
int /* O - 0 on success, -1 on failure */
mimeAddTypeRule(mime_type_t *mt, /* I - Type to add to */
const char *rule) /* I - Rule to add */
{
int num_values, /* Number of values seen */
op, /* Operation code */
logic, /* Logic for next rule */
invert; /* Invert following rule? */
char name[255], /* Name in rule string */
value[3][255], /* Value in rule string */
*ptr, /* Position in name or value */
quote; /* Quote character */
int length[3]; /* Length of each parameter */
mime_magic_t *temp, /* New rule */
*current; /* Current rule */
DEBUG_printf(("mimeAddTypeRule(mt=%p(%s/%s), rule=\"%s\")", mt,
mt ? mt->super : "???", mt ? mt->type : "???", rule));
/*
* Range check input...
*/
if (!mt || !rule)
return (-1);
/*
* Find the last rule in the top-level of the rules tree.
*/
for (current = mt->rules; current; current = current->next)
if (!current->next)
break;
/*
* Parse the rules string. Most rules are either a file extension or a
* comparison function:
*
* extension
* function(parameters)
*/
logic = MIME_MAGIC_NOP;
invert = 0;
while (*rule != '\0')
{
while (isspace(*rule & 255))
rule ++;
if (*rule == '(')
{
DEBUG_puts("1mimeAddTypeRule: New parenthesis group");
logic = MIME_MAGIC_NOP;
rule ++;
}
else if (*rule == ')')
{
DEBUG_puts("1mimeAddTypeRule: Close paren...");
if (current == NULL || current->parent == NULL)
return (-1);
current = current->parent;
if (current->parent == NULL)
logic = MIME_MAGIC_OR;
else
logic = current->parent->op;
rule ++;
}
else if (*rule == '+' && current != NULL)
{
if (logic != MIME_MAGIC_AND &&
current != NULL && current->prev != NULL)
{
/*
* OK, we have more than 1 rule in the current tree level... Make a
* new group tree and move the previous rule to it...
*/
if ((temp = calloc(1, sizeof(mime_magic_t))) == NULL)
return (-1);
temp->op = MIME_MAGIC_AND;
temp->child = current;
temp->parent = current->parent;
current->prev->next = temp;
temp->prev = current->prev;
current->prev = NULL;
current->parent = temp;
DEBUG_printf(("1mimeAddTypeRule: Creating new AND group %p.", temp));
}
else if (current->parent)
{
DEBUG_printf(("1mimeAddTypeRule: Setting group %p op to AND.",
current->parent));
current->parent->op = MIME_MAGIC_AND;
}
logic = MIME_MAGIC_AND;
rule ++;
}
else if (*rule == ',')
{
if (logic != MIME_MAGIC_OR && current != NULL)
{
/*
* OK, we have two possibilities; either this is the top-level rule or
* we have a bunch of AND rules at this level.
*/
if (current->parent == NULL)
{
/*
* This is the top-level rule; we have to move *all* of the AND rules
* down a level, as AND has precedence over OR.
*/
if ((temp = calloc(1, sizeof(mime_magic_t))) == NULL)
return (-1);
DEBUG_printf(("1mimeAddTypeRule: Creating new AND group %p inside OR "
"group.", temp));
while (current->prev != NULL)
{
current->parent = temp;
current = current->prev;
}
current->parent = temp;
temp->op = MIME_MAGIC_AND;
temp->child = current;
mt->rules = current = temp;
}
else
{
/*
* This isn't the top rule, so go up one level...
*/
DEBUG_puts("1mimeAddTypeRule: Going up one level.");
current = current->parent;
}
}
logic = MIME_MAGIC_OR;
rule ++;
}
else if (*rule == '!')
{
DEBUG_puts("1mimeAddTypeRule: NOT");
invert = 1;
rule ++;
}
else if (isalnum(*rule & 255))
{
/*
* Read an extension name or a function...
*/
ptr = name;
while (isalnum(*rule & 255) && (size_t)(ptr - name) < (sizeof(name) - 1))
*ptr++ = *rule++;
*ptr = '\0';
if (*rule == '(')
{
/*
* Read function parameters...
*/
rule ++;
for (num_values = 0;
num_values < (int)(sizeof(value) / sizeof(value[0]));
num_values ++)
{
ptr = value[num_values];
while ((size_t)(ptr - value[num_values]) < (sizeof(value[0]) - 1) &&
*rule != '\0' && *rule != ',' && *rule != ')')
{
if (isspace(*rule & 255))
{
/*
* Ignore whitespace...
*/
rule ++;
continue;
}
else if (*rule == '\"' || *rule == '\'')
{
/*
* Copy quoted strings literally...
*/
quote = *rule++;
while (*rule != '\0' && *rule != quote &&
(size_t)(ptr - value[num_values]) < (sizeof(value[0]) - 1))
*ptr++ = *rule++;
if (*rule == quote)
rule ++;
else
return (-1);
}
else if (*rule == '<')
{
rule ++;
while (*rule != '>' && *rule != '\0' &&
(size_t)(ptr - value[num_values]) < (sizeof(value[0]) - 1))
{
if (isxdigit(rule[0] & 255) && isxdigit(rule[1] & 255))
{
if (isdigit(*rule))
*ptr = (char)((*rule++ - '0') << 4);
else
*ptr = (char)((tolower(*rule++) - 'a' + 10) << 4);
if (isdigit(*rule))
*ptr++ |= *rule++ - '0';
else
*ptr++ |= tolower(*rule++) - 'a' + 10;
}
else
return (-1);
}
if (*rule == '>')
rule ++;
else
return (-1);
}
else
*ptr++ = *rule++;
}
*ptr = '\0';
length[num_values] = ptr - value[num_values];
if (*rule != ',')
{
num_values ++;
break;
}
rule ++;
}
if (*rule != ')')
return (-1);
rule ++;
/*
* Figure out the function...
*/
if (!strcmp(name, "match"))
op = MIME_MAGIC_MATCH;
else if (!strcmp(name, "ascii"))
op = MIME_MAGIC_ASCII;
else if (!strcmp(name, "printable"))
op = MIME_MAGIC_PRINTABLE;
else if (!strcmp(name, "regex"))
op = MIME_MAGIC_REGEX;
else if (!strcmp(name, "string"))
op = MIME_MAGIC_STRING;
else if (!strcmp(name, "istring"))
op = MIME_MAGIC_ISTRING;
else if (!strcmp(name, "char"))
op = MIME_MAGIC_CHAR;
else if (!strcmp(name, "short"))
op = MIME_MAGIC_SHORT;
else if (!strcmp(name, "int"))
op = MIME_MAGIC_INT;
else if (!strcmp(name, "locale"))
op = MIME_MAGIC_LOCALE;
else if (!strcmp(name, "contains"))
op = MIME_MAGIC_CONTAINS;
else if (!strcmp(name, "priority") && num_values == 1)
{
mt->priority = atoi(value[0]);
continue;
}
else
return (-1);
}
else
{
/*
* This is just a filename match on the extension...
*/
snprintf(value[0], sizeof(value[0]), "*.%s", name);
length[0] = (int)strlen(value[0]);
op = MIME_MAGIC_MATCH;
num_values = 1;
}
/*
* Add a rule for this operation.
*/
if ((temp = calloc(1, sizeof(mime_magic_t))) == NULL)
return (-1);
temp->invert = (short)invert;
if (current != NULL)
{
temp->parent = current->parent;
current->next = temp;
}
else
mt->rules = temp;
temp->prev = current;
if (logic == MIME_MAGIC_NOP)
{
/*
* Add parenthetical grouping...
*/
DEBUG_printf(("1mimeAddTypeRule: Making new OR group %p for "
"parenthesis.", temp));
temp->op = MIME_MAGIC_OR;
if ((temp->child = calloc(1, sizeof(mime_magic_t))) == NULL)
return (-1);
temp->child->parent = temp;
temp->child->invert = temp->invert;
temp->invert = 0;
temp = temp->child;
logic = MIME_MAGIC_OR;
}
DEBUG_printf(("1mimeAddTypeRule: Adding %p: %s, op=MIME_MAGIC_%s(%d), "
"logic=MIME_MAGIC_%s, invert=%d.", temp, name,
debug_ops[op], op, debug_ops[logic], invert));
/*
* Fill in data for the rule...
*/
current = temp;
temp->op = (short)op;
invert = 0;
switch (op)
{
case MIME_MAGIC_MATCH :
if ((size_t)length[0] > (sizeof(temp->value.matchv) - 1))
return (-1);
strlcpy(temp->value.matchv, value[0], sizeof(temp->value.matchv));
break;
case MIME_MAGIC_ASCII :
case MIME_MAGIC_PRINTABLE :
temp->offset = strtol(value[0], NULL, 0);
temp->length = strtol(value[1], NULL, 0);
if (temp->length > MIME_MAX_BUFFER)
temp->length = MIME_MAX_BUFFER;
break;
case MIME_MAGIC_REGEX :
temp->offset = strtol(value[0], NULL, 0);
temp->length = MIME_MAX_BUFFER;
if (regcomp(&(temp->value.rev), value[1], REG_NOSUB | REG_EXTENDED))
return (-1);
break;
case MIME_MAGIC_STRING :
case MIME_MAGIC_ISTRING :
temp->offset = strtol(value[0], NULL, 0);
if (num_values < 2 || (size_t)length[1] > sizeof(temp->value.stringv))
return (-1);
temp->length = length[1];
memcpy(temp->value.stringv, value[1], (size_t)length[1]);
break;
case MIME_MAGIC_CHAR :
temp->offset = strtol(value[0], NULL, 0);
if (num_values < 2)
return (-1);
else if (length[1] == 1)
temp->value.charv = (unsigned char)value[1][0];
else
temp->value.charv = (unsigned char)strtol(value[1], NULL, 0);
DEBUG_printf(("1mimeAddTypeRule: CHAR(%d,0x%02x)", temp->offset,
temp->value.charv));
break;
case MIME_MAGIC_SHORT :
temp->offset = strtol(value[0], NULL, 0);
temp->value.shortv = (unsigned short)strtol(value[1], NULL, 0);
break;
case MIME_MAGIC_INT :
temp->offset = strtol(value[0], NULL, 0);
temp->value.intv = (unsigned)strtol(value[1], NULL, 0);
break;
case MIME_MAGIC_LOCALE :
if ((size_t)length[0] > (sizeof(temp->value.localev) - 1))
return (-1);
strlcpy(temp->value.localev, value[0], sizeof(temp->value.localev));
break;
case MIME_MAGIC_CONTAINS :
temp->offset = strtol(value[0], NULL, 0);
temp->region = strtol(value[1], NULL, 0);
if (num_values < 3 || (size_t)length[2] > sizeof(temp->value.stringv))
return (-1);
temp->length = length[2];
memcpy(temp->value.stringv, value[2], (size_t)length[2]);
break;
}
}
else
break;
}
return (0);
}
/*
* 'mimeFileType()' - Determine the type of a file.
*/
mime_type_t * /* O - Type of file */
mimeFileType(mime_t *mime, /* I - MIME database */
const char *pathname, /* I - Name of file to check on disk */
const char *filename, /* I - Original filename or NULL */
int *compression) /* O - Is the file compressed? */
{
_mime_filebuf_t fb; /* File buffer */
const char *base; /* Base filename of file */
mime_type_t *type, /* File type */
*best; /* Best match */
DEBUG_printf(("mimeFileType(mime=%p, pathname=\"%s\", filename=\"%s\", "
"compression=%p)", mime, pathname, filename, compression));
/*
* Range check input parameters...
*/
if (!mime || !pathname)
{
DEBUG_puts("1mimeFileType: Returning NULL.");
return (NULL);
}
/*
* Try to open the file...
*/
if ((fb.fp = cupsFileOpen(pathname, "r")) == NULL)
{
DEBUG_printf(("1mimeFileType: Unable to open \"%s\": %s", pathname,
strerror(errno)));
DEBUG_puts("1mimeFileType: Returning NULL.");
return (NULL);
}
/*
* Then preload the first MIME_MAX_BUFFER bytes of the file into the file
* buffer, returning an error if we can't read anything...
*/
fb.offset = 0;
fb.length = (int)cupsFileRead(fb.fp, (char *)fb.buffer, MIME_MAX_BUFFER);
if (fb.length <= 0)
{
DEBUG_printf(("1mimeFileType: Unable to read from \"%s\": %s", pathname, strerror(errno)));
DEBUG_puts("1mimeFileType: Returning NULL.");
cupsFileClose(fb.fp);
return (NULL);
}
/*
* Figure out the base filename (without directory portion)...
*/
if (filename)
{
if ((base = strrchr(filename, '/')) != NULL)
base ++;
else
base = filename;
}
else if ((base = strrchr(pathname, '/')) != NULL)
base ++;
else
base = pathname;
/*
* Then check it against all known types...
*/
for (type = (mime_type_t *)cupsArrayFirst(mime->types), best = NULL;
type;
type = (mime_type_t *)cupsArrayNext(mime->types))
if (mime_check_rules(base, &fb, type->rules))
{
if (!best || type->priority > best->priority)
best = type;
}
/*
* Finally, close the file and return a match (if any)...
*/
if (compression)
{
*compression = cupsFileCompression(fb.fp);
DEBUG_printf(("1mimeFileType: *compression=%d", *compression));
}
cupsFileClose(fb.fp);
DEBUG_printf(("1mimeFileType: Returning %p(%s/%s).", best,
best ? best->super : "???", best ? best->type : "???"));
return (best);
}
/*
* 'mimeType()' - Lookup a file type.
*/
mime_type_t * /* O - Matching file type definition */
mimeType(mime_t *mime, /* I - MIME database */
const char *super, /* I - Super-type name */
const char *type) /* I - Type name */
{
mime_type_t key, /* MIME type search key */
*mt; /* Matching type */
DEBUG_printf(("mimeType(mime=%p, super=\"%s\", type=\"%s\")", mime, super,
type));
/*
* Range check input...
*/
if (!mime || !super || !type)
{
DEBUG_puts("1mimeType: Returning NULL.");
return (NULL);
}
/*
* Lookup the type in the array...
*/
strlcpy(key.super, super, sizeof(key.super));
strlcpy(key.type, type, sizeof(key.type));
mt = (mime_type_t *)cupsArrayFind(mime->types, &key);
DEBUG_printf(("1mimeType: Returning %p.", mt));
return (mt);
}
/*
* 'mime_compare_types()' - Compare two MIME super/type names.
*/
static int /* O - Result of comparison */
mime_compare_types(mime_type_t *t0, /* I - First type */
mime_type_t *t1) /* I - Second type */
{
int i; /* Result of comparison */
if ((i = _cups_strcasecmp(t0->super, t1->super)) == 0)
i = _cups_strcasecmp(t0->type, t1->type);
return (i);
}
/*
* 'mime_check_rules()' - Check each rule in a list.
*/
static int /* O - 1 if match, 0 if no match */
mime_check_rules(
const char *filename, /* I - Filename */
_mime_filebuf_t *fb, /* I - File to check */
mime_magic_t *rules) /* I - Rules to check */
{
int n; /* Looping var */
int region; /* Region to look at */
int logic, /* Logic to apply */
result; /* Result of test */
unsigned intv; /* Integer value */
short shortv; /* Short value */
unsigned char *bufptr; /* Pointer into buffer */
DEBUG_printf(("4mime_check_rules(filename=\"%s\", fb=%p, rules=%p)", filename,
fb, rules));
if (rules == NULL)
return (0);
if (rules->parent == NULL)
logic = MIME_MAGIC_OR;
else
logic = rules->parent->op;
result = 0;
while (rules != NULL)
{
/*
* Compute the result of this rule...
*/
switch (rules->op)
{
case MIME_MAGIC_MATCH :
result = mime_patmatch(filename, rules->value.matchv);
break;
case MIME_MAGIC_ASCII :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->length) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_ASCII fb->length=%d", fb->length));
}
/*
* Test for ASCII printable characters plus standard control chars.
*/
if ((rules->offset + rules->length) > (fb->offset + fb->length))
n = fb->offset + fb->length - rules->offset;
else
n = rules->length;
bufptr = fb->buffer + rules->offset - fb->offset;
while (n > 0)
if ((*bufptr >= 32 && *bufptr <= 126) ||
(*bufptr >= 8 && *bufptr <= 13) ||
*bufptr == 26 || *bufptr == 27)
{
n --;
bufptr ++;
}
else
break;
result = (n == 0);
break;
case MIME_MAGIC_PRINTABLE :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->length) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_PRINTABLE fb->length=%d", fb->length));
}
/*
* Test for 8-bit printable characters plus standard control chars.
*/
if ((rules->offset + rules->length) > (fb->offset + fb->length))
n = fb->offset + fb->length - rules->offset;
else
n = rules->length;
bufptr = fb->buffer + rules->offset - fb->offset;
while (n > 0)
if (*bufptr >= 128 ||
(*bufptr >= 32 && *bufptr <= 126) ||
(*bufptr >= 8 && *bufptr <= 13) ||
*bufptr == 26 || *bufptr == 27)
{
n --;
bufptr ++;
}
else
break;
result = (n == 0);
break;
case MIME_MAGIC_REGEX :
DEBUG_printf(("5mime_check_rules: regex(%d, \"%s\")", rules->offset,
rules->value.stringv));
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->length) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_REGEX fb->length=%d", fb->length));
DEBUG_printf(("5mime_check_rules: loaded %d byte fb->buffer at %d, starts "
"with \"%c%c%c%c\".",
fb->length, fb->offset, fb->buffer[0], fb->buffer[1],
fb->buffer[2], fb->buffer[3]));
}
/*
* Compare the buffer against the string. If the file is too
* short then don't compare - it can't match...
*/
if (fb->length > 0)
{
char temp[MIME_MAX_BUFFER + 1];
/* Temporary buffer */
memcpy(temp, fb->buffer, (size_t)fb->length);
temp[fb->length] = '\0';
result = !regexec(&(rules->value.rev), temp, 0, NULL, 0);
}
DEBUG_printf(("5mime_check_rules: result=%d", result));
break;
case MIME_MAGIC_STRING :
DEBUG_printf(("5mime_check_rules: string(%d, \"%s\")", rules->offset,
rules->value.stringv));
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->length) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_STRING fb->length=%d", fb->length));
DEBUG_printf(("5mime_check_rules: loaded %d byte fb->buffer at %d, starts "
"with \"%c%c%c%c\".",
fb->length, fb->offset, fb->buffer[0], fb->buffer[1],
fb->buffer[2], fb->buffer[3]));
}
/*
* Compare the buffer against the string. If the file is too
* short then don't compare - it can't match...
*/
if ((rules->offset + rules->length) > (fb->offset + fb->length))
result = 0;
else
result = !memcmp(fb->buffer + rules->offset - fb->offset, rules->value.stringv, (size_t)rules->length);
DEBUG_printf(("5mime_check_rules: result=%d", result));
break;
case MIME_MAGIC_ISTRING :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->length) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_ISTRING fb->length=%d", fb->length));
}
/*
* Compare the buffer against the string. If the file is too
* short then don't compare - it can't match...
*/
if ((rules->offset + rules->length) > (fb->offset + fb->length))
result = 0;
else
result = !_cups_strncasecmp((char *)fb->buffer + rules->offset - fb->offset, rules->value.stringv, (size_t)rules->length);
break;
case MIME_MAGIC_CHAR :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset)
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_CHAR fb->length=%d", fb->length));
}
/*
* Compare the character values; if the file is too short, it
* can't match...
*/
if (fb->length < 1)
result = 0;
else
result = (fb->buffer[rules->offset - fb->offset] ==
rules->value.charv);
break;
case MIME_MAGIC_SHORT :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + 2) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_SHORT fb->length=%d", fb->length));
}
/*
* Compare the short values; if the file is too short, it
* can't match...
*/
if (fb->length < 2)
result = 0;
else
{
bufptr = fb->buffer + rules->offset - fb->offset;
shortv = (short)((bufptr[0] << 8) | bufptr[1]);
result = (shortv == rules->value.shortv);
}
break;
case MIME_MAGIC_INT :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + 4) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_INT fb->length=%d", fb->length));
}
/*
* Compare the int values; if the file is too short, it
* can't match...
*/
if (fb->length < 4)
result = 0;
else
{
bufptr = fb->buffer + rules->offset - fb->offset;
intv = (unsigned)((((((bufptr[0] << 8) | bufptr[1]) << 8) | bufptr[2]) << 8) | bufptr[3]);
result = (intv == rules->value.intv);
}
break;
case MIME_MAGIC_LOCALE :
#if defined(_WIN32) || defined(__EMX__) || defined(__APPLE__)
result = !strcmp(rules->value.localev, setlocale(LC_ALL, ""));
#else
result = !strcmp(rules->value.localev, setlocale(LC_MESSAGES, ""));
#endif /* __APPLE__ */
break;
case MIME_MAGIC_CONTAINS :
/*
* Load the buffer if necessary...
*/
if (fb->offset < 0 || rules->offset < fb->offset ||
(rules->offset + rules->region) > (fb->offset + fb->length))
{
/*
* Reload file buffer...
*/
cupsFileSeek(fb->fp, rules->offset);
fb->length = cupsFileRead(fb->fp, (char *)fb->buffer,
sizeof(fb->buffer));
fb->offset = rules->offset;
DEBUG_printf(("4mime_check_rules: MIME_MAGIC_CONTAINS fb->length=%d", fb->length));
}
/*
* Compare the buffer against the string. If the file is too
* short then don't compare - it can't match...
*/
if ((rules->offset + rules->length) > (fb->offset + fb->length))
result = 0;
else
{
if (fb->length > rules->region)
region = rules->region - rules->length;
else
region = fb->length - rules->length;
for (n = 0; n < region; n ++)
if ((result = (memcmp(fb->buffer + rules->offset - fb->offset + n, rules->value.stringv, (size_t)rules->length) == 0)) != 0)
break;
}
break;
default :
if (rules->child != NULL)
result = mime_check_rules(filename, fb, rules->child);
else
result = 0;
break;
}
/*
* If the logic is inverted, invert the result...
*/
if (rules->invert)
result = !result;
/*
* OK, now if the current logic is OR and this result is true, the this
* rule set is true. If the current logic is AND and this result is false,
* the the rule set is false...
*/
DEBUG_printf(("5mime_check_rules: result of test %p (MIME_MAGIC_%s) is %d",
rules, debug_ops[rules->op], result));
if ((result && logic == MIME_MAGIC_OR) ||
(!result && logic == MIME_MAGIC_AND))
return (result);
/*
* Otherwise the jury is still out on this one, so move to the next rule.
*/
rules = rules->next;
}
return (result);
}
/*
* 'mime_patmatch()' - Pattern matching.
*/
static int /* O - 1 if match, 0 if no match */
mime_patmatch(const char *s, /* I - String to match against */
const char *pat) /* I - Pattern to match against */
{
/*
* Range check the input...
*/
if (s == NULL || pat == NULL)
return (0);
/*
* Loop through the pattern and match strings, and stop if we come to a
* point where the strings don't match or we find a complete match.
*/
while (*s != '\0' && *pat != '\0')
{
if (*pat == '*')
{
/*
* Wildcard - 0 or more characters...
*/
pat ++;
if (*pat == '\0')
return (1); /* Last pattern char is *, so everything matches... */
/*
* Test all remaining combinations until we get to the end of the string.
*/
while (*s != '\0')
{
if (mime_patmatch(s, pat))
return (1);
s ++;
}
}
else if (*pat == '?')
{
/*
* Wildcard - 1 character...
*/
pat ++;
s ++;
continue;
}
else if (*pat == '[')
{
/*
* Match a character from the input set [chars]...
*/
pat ++;
while (*pat != ']' && *pat != '\0')
if (*s == *pat)
break;
else
pat ++;
if (*pat == ']' || *pat == '\0')
return (0);
while (*pat != ']' && *pat != '\0')
pat ++;
if (*pat == ']')
pat ++;
continue;
}
else if (*pat == '\\')
{
/*
* Handle quoted characters...
*/
pat ++;
}
/*
* Stop if the pattern and string don't match...
*/
if (*pat++ != *s++)
return (0);
}
/*
* Done parsing the pattern and string; return 1 if the last character
* matches and 0 otherwise...
*/
return (*s == *pat);
}