/* Return whether the given string is a valid field or method name. */
bool dexIsValidMemberName(const char* s) {
bool angleName = false;
switch (*s) {
case '\0': {
// The empty string is not a valid name.
return false;
}
case '<': {
/*
* '<' is allowed only at the start of a name, and if present,
* means that the name must end with '>'.
*/
angleName = true;
s++;
break;
}
}
for (;;) {
switch (*s) {
case '\0': {
return !angleName;
}
case '>': {
return angleName && s[1] == '\0';
}
}
if (!dexIsValidMemberNameUtf8(&s)) {
return false;
}
}
}
/* Return whether the given string is a valid type descriptor. */
bool dexIsValidTypeDescriptor(const char* s) {
int arrayCount = 0;
while (*s == '[') {
arrayCount++;
s++;
}
if (arrayCount > 255) {
// Arrays may have no more than 255 dimensions.
return false;
}
switch (*(s++)) {
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 'Z': {
// These are all single-character descriptors for primitive types.
return (*s == '\0');
}
case 'V': {
// You can't have an array of void.
return (arrayCount == 0) && (*s == '\0');
}
case 'L': {
// Break out and continue below.
break;
}
default: {
// Oddball descriptor character.
return false;
}
}
// We just consumed the 'L' that introduces a class name.
bool slashOrFirst = true; // first character or just encountered a slash
for (;;) {
u1 c = (u1) *s;
switch (c) {
case '\0': {
// Premature end.
return false;
}
case ';': {
/*
* Make sure that this is the end of the string and that
* it doesn't end with an empty component (including the
* degenerate case of "L;").
*/
return (s[1] == '\0') && !slashOrFirst;
}
case '/': {
if (slashOrFirst) {
// Slash at start or two slashes in a row.
return false;
}
slashOrFirst = true;
s++;
break;
}
default: {
if (!dexIsValidMemberNameUtf8(&s)) {
return false;
}
slashOrFirst = false;
break;
}
}
}
}
/* Helper for validating type descriptors and class names, which is parametric
* with respect to type vs. class and dot vs. slash. */
static bool isValidTypeDescriptorOrClassName(const char* s, bool isClassName,
bool dotSeparator) {
int arrayCount = 0;
while (*s == '[') {
arrayCount++;
s++;
}
if (arrayCount > 255) {
// Arrays may have no more than 255 dimensions.
return false;
}
if (arrayCount != 0) {
/*
* If we're looking at an array of some sort, then it doesn't
* matter if what is being asked for is a class name; the
* format looks the same as a type descriptor in that case, so
* treat it as such.
*/
isClassName = false;
}
if (!isClassName) {
/*
* We are looking for a descriptor. Either validate it as a
* single-character primitive type, or continue on to check the
* embedded class name (bracketed by "L" and ";").
*/
switch (*(s++)) {
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 'Z': {
// These are all single-character descriptors for primitive types.
return (*s == '\0');
}
case 'V': {
// Non-array void is valid, but you can't have an array of void.
return (arrayCount == 0) && (*s == '\0');
}
case 'L': {
// Class name: Break out and continue below.
break;
}
default: {
// Oddball descriptor character.
return false;
}
}
}
/*
* We just consumed the 'L' that introduces a class name as part
* of a type descriptor, or we are looking for an unadorned class
* name.
*/
bool sepOrFirst = true; // first character or just encountered a separator.
for (;;) {
u1 c = (u1) *s;
switch (c) {
case '\0': {
/*
* Premature end for a type descriptor, but valid for
* a class name as long as we haven't encountered an
* empty component (including the degenerate case of
* the empty string "").
*/
return isClassName && !sepOrFirst;
}
case ';': {
/*
* Invalid character for a class name, but the
* legitimate end of a type descriptor. In the latter
* case, make sure that this is the end of the string
* and that it doesn't end with an empty component
* (including the degenerate case of "L;").
*/
return !isClassName && !sepOrFirst && (s[1] == '\0');
}
case '/':
case '.': {
if (dotSeparator != (c == '.')) {
// The wrong separator character.
return false;
}
if (sepOrFirst) {
// Separator at start or two separators in a row.
return false;
}
sepOrFirst = true;
s++;
break;
}
default: {
if (!dexIsValidMemberNameUtf8(&s)) {
return false;
}
sepOrFirst = false;
break;
}
}
}
}