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transmission/libtransmission/jsonsl.c

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/*
* jsonsl
* https://github.com/mnunberg/jsonsl
*
* Copyright (c) 2012 M. Nunberg, mnunberg@haskalah.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "jsonsl.h"
#include <assert.h>
#include <ctype.h>
#ifdef JSONSL_USE_METRICS
#define XMETRICS \
X(STRINGY_INSIGNIFICANT) \
X(STRINGY_SLOWPATH) \
X(ALLOWED_WHITESPACE) \
X(QUOTE_FASTPATH) \
X(SPECIAL_FASTPATH) \
X(SPECIAL_WSPOP) \
X(SPECIAL_SLOWPATH) \
X(GENERIC) \
X(STRUCTURAL_TOKEN) \
X(SPECIAL_SWITCHFIRST) \
X(STRINGY_CATCH) \
X(ESCAPES) \
X(TOTAL) \
struct jsonsl_metrics_st {
#define X(m) \
unsigned long metric_##m;
XMETRICS
#undef X
};
static struct jsonsl_metrics_st GlobalMetrics = { 0 };
static unsigned long GenericCounter[0x100] = { 0 };
static unsigned long StringyCatchCounter[0x100] = { 0 };
#define INCR_METRIC(m) \
GlobalMetrics.metric_##m++;
#define INCR_GENERIC(c) \
INCR_METRIC(GENERIC); \
GenericCounter[c]++; \
#define INCR_STRINGY_CATCH(c) \
INCR_METRIC(STRINGY_CATCH); \
StringyCatchCounter[c]++;
JSONSL_API
void jsonsl_dump_global_metrics(void)
{
int ii;
printf("JSONSL Metrics:\n");
#define X(m) \
printf("\t%-30s %20lu (%0.2f%%)\n", #m, GlobalMetrics.metric_##m, \
(float)((float)(GlobalMetrics.metric_##m/(float)GlobalMetrics.metric_TOTAL)) * 100);
XMETRICS
#undef X
printf("Generic Characters:\n");
for (ii = 0; ii < 0xff; ii++) {
if (GenericCounter[ii]) {
printf("\t[ %c ] %lu\n", ii, GenericCounter[ii]);
}
}
printf("Weird string loop\n");
for (ii = 0; ii < 0xff; ii++) {
if (StringyCatchCounter[ii]) {
printf("\t[ %c ] %lu\n", ii, StringyCatchCounter[ii]);
}
}
}
#else
#define INCR_METRIC(m)
#define INCR_GENERIC(c)
#define INCR_STRINGY_CATCH(c)
JSONSL_API
void jsonsl_dump_global_metrics(void) { }
#endif /* JSONSL_USE_METRICS */
#define CASE_DIGITS \
case '1': \
case '2': \
case '3': \
case '4': \
case '5': \
case '6': \
case '7': \
case '8': \
case '9': \
case '0':
/**
* This table (predeclared) contains characters which are recognized
* non-string values.
*/
static jsonsl_special_t *Special_table;
#define extract_special(c) \
Special_table[(unsigned int)(c & 0xff)]
/**
* This table (predeclared) contains the tokens and other characters
* which signal the termination of the non-string values.
*/
static int *Special_Endings;
#define is_special_end(c) \
Special_Endings[(unsigned int)c & 0xff]
/**
* This table contains entries for the allowed whitespace
* as per RFC 4627
*/
static int *Allowed_Whitespace;
#define is_allowed_whitespace(c) \
(c == ' ' || Allowed_Whitespace[(unsigned int)c & 0xff])
/**
* This table contains allowed two-character escapes
* as per the RFC
*/
static int *Allowed_Escapes;
#define is_allowed_escape(c) \
Allowed_Escapes[(unsigned int)c & 0xff]
JSONSL_API
jsonsl_t jsonsl_new(int nlevels)
{
struct jsonsl_st *jsn =
calloc(1, sizeof (*jsn) +
( (nlevels-1) * sizeof (struct jsonsl_state_st) )
);
jsn->levels_max = nlevels;
jsn->max_callback_level = -1;
jsonsl_reset(jsn);
return jsn;
}
JSONSL_API
void jsonsl_reset(jsonsl_t jsn)
{
unsigned int ii;
jsn->tok_last = 0;
jsn->can_insert = 1;
jsn->pos = 0;
jsn->level = 0;
jsn->in_escape = 0;
jsn->expecting = 0;
memset(jsn->stack, 0, (jsn->levels_max * sizeof (struct jsonsl_state_st)));
for (ii = 0; ii < jsn->levels_max; ii++) {
jsn->stack[ii].level = ii;
}
}
JSONSL_API
void jsonsl_destroy(jsonsl_t jsn)
{
if (jsn) {
free(jsn);
}
}
JSONSL_API
void
jsonsl_feed(jsonsl_t jsn, const jsonsl_char_t *bytes, size_t nbytes)
{
#define INVOKE_ERROR(eb) \
if (jsn->error_callback(jsn, JSONSL_ERROR_##eb, state, (char*)c)) { \
goto GT_AGAIN; \
} \
return;
#define STACK_PUSH \
if (jsn->level >= (levels_max-1)) { \
jsn->error_callback(jsn, JSONSL_ERROR_LEVELS_EXCEEDED, state, (char*)c); \
return; \
} \
state = jsn->stack + (++jsn->level); \
state->ignore_callback = jsn->stack[jsn->level-1].ignore_callback; \
state->pos_begin = jsn->pos;
#define STACK_POP_NOPOS \
state->pos_cur = jsn->pos; \
state = jsn->stack + (--jsn->level);
#define STACK_POP \
STACK_POP_NOPOS; \
state->pos_cur = jsn->pos;
#define CALLBACK_AND_POP_NOPOS(T) \
state->pos_cur = jsn->pos; \
DO_CALLBACK(T, POP); \
state->nescapes = 0; \
state = jsn->stack + (--jsn->level);
#define CALLBACK_AND_POP(T) \
CALLBACK_AND_POP_NOPOS(T); \
state->pos_cur = jsn->pos;
#define SPECIAL_POP \
CALLBACK_AND_POP(SPECIAL); \
jsn->expecting = 0; \
jsn->tok_last = 0; \
#define CUR_CHAR (*(jsonsl_uchar_t*)c)
#define DO_CALLBACK(T, action) \
if (jsn->call_##T && \
jsn->max_callback_level > state->level && \
state->ignore_callback == 0) { \
\
if (jsn->action_callback_##action) { \
jsn->action_callback_##action(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
} else if (jsn->action_callback) { \
jsn->action_callback(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
} \
}
/**
* Verifies that we are able to insert the (non-string) item into a hash.
*/
#define ENSURE_HVAL \
if (state->nelem % 2 == 0 && state->type == JSONSL_T_OBJECT) { \
INVOKE_ERROR(HKEY_EXPECTED); \
}
#define VERIFY_SPECIAL(lit) \
if (CUR_CHAR != (lit)[jsn->pos - state->pos_begin]) { \
INVOKE_ERROR(SPECIAL_EXPECTED); \
}
const jsonsl_uchar_t *c = (jsonsl_uchar_t*)bytes;
size_t levels_max = jsn->levels_max;
struct jsonsl_state_st *state = jsn->stack + jsn->level;
static int chrt_string_nopass[0x100] = { JSONSL_CHARTABLE_string_nopass };
jsn->base = bytes;
for (; nbytes; nbytes--, jsn->pos++, c++) {
register jsonsl_type_t state_type;
INCR_METRIC(TOTAL);
/* Special escape handling for some stuff */
if (jsn->in_escape) {
jsn->in_escape = 0;
if (!is_allowed_escape(CUR_CHAR)) {
INVOKE_ERROR(ESCAPE_INVALID);
} else if (CUR_CHAR == 'u') {
DO_CALLBACK(UESCAPE, UESCAPE);
if (jsn->return_UESCAPE) {
return;
}
}
goto GT_NEXT;
}
GT_AGAIN:
/**
* Several fast-tracks for common cases:
*/
state_type = state->type;
if (state_type & JSONSL_Tf_STRINGY) {
/* check if our character cannot ever change our current string state
* or throw an error
*/
if (
#ifdef JSONSL_USE_WCHAR
CUR_CHAR >= 0x100 ||
#endif /* JSONSL_USE_WCHAR */
(!chrt_string_nopass[CUR_CHAR & 0xff])) {
INCR_METRIC(STRINGY_INSIGNIFICANT);
goto GT_NEXT;
} else if (CUR_CHAR == '"') {
goto GT_QUOTE;
} else if (CUR_CHAR == '\\') {
goto GT_ESCAPE;
} else {
INVOKE_ERROR(WEIRD_WHITESPACE);
}
INCR_METRIC(STRINGY_SLOWPATH);
} else if (state_type == JSONSL_T_SPECIAL) {
if (state->special_flags & JSONSL_SPECIALf_NUMERIC) {
switch (CUR_CHAR) {
CASE_DIGITS
state->nelem = (state->nelem*10) + (CUR_CHAR-0x30);
goto GT_NEXT;
case 'e':
case 'E':
case '-':
case '+':
state->special_flags |= JSONSL_SPECIALf_EXPONENT;
goto GT_NEXT;
case '.':
state->special_flags |= JSONSL_SPECIALf_FLOAT;
goto GT_NEXT;
default:
if (is_special_end(CUR_CHAR)) {
goto GT_SPECIAL_POP;
}
INVOKE_ERROR(INVALID_NUMBER);
break;
}
}
/* else if (!NUMERIC) */
if (!is_special_end(CUR_CHAR)) {
/* Verify TRUE, FALSE, NULL */
if (state->special_flags == JSONSL_SPECIALf_TRUE) {
VERIFY_SPECIAL("true");
} else if (state->special_flags == JSONSL_SPECIALf_FALSE) {
VERIFY_SPECIAL("false");
} else if (state->special_flags == JSONSL_SPECIALf_NULL) {
VERIFY_SPECIAL("null");
}
INCR_METRIC(SPECIAL_FASTPATH);
goto GT_NEXT;
}
GT_SPECIAL_POP:
SPECIAL_POP;
jsn->expecting = ',';
if (is_allowed_whitespace(CUR_CHAR)) {
goto GT_NEXT;
}
/**
* This works because we have a non-whitespace token
* which is not a special token. If this is a structural
* character then it will be gracefully handled by the
* switch statement. Otherwise it will default to the 'special'
* state again,
*/
goto GT_STRUCTURAL_TOKEN;
} else if (is_allowed_whitespace(CUR_CHAR)) {
INCR_METRIC(ALLOWED_WHITESPACE);
/* So we're not special. Harmless insignificant whitespace
* passthrough
*/
goto GT_NEXT;
} else if (extract_special(CUR_CHAR)) {
/* not a string, whitespace, or structural token. must be special */
goto GT_SPECIAL_BEGIN;
}
INCR_GENERIC(CUR_CHAR);
if (CUR_CHAR == '"') {
GT_QUOTE:
jsn->can_insert = 0;
switch (state_type) {
/* the end of a string or hash key */
case JSONSL_T_STRING:
CALLBACK_AND_POP(STRING);
goto GT_NEXT;
case JSONSL_T_HKEY:
CALLBACK_AND_POP(HKEY);
goto GT_NEXT;
case JSONSL_T_OBJECT:
state->nelem++;
if ( (state->nelem-1) % 2 ) {
/* Odd, this must be a hash value */
if (jsn->tok_last != ':') {
INVOKE_ERROR(MISSING_TOKEN);
}
jsn->expecting = ','; /* Can't figure out what to expect next */
jsn->tok_last = 0;
STACK_PUSH;
state->type = JSONSL_T_STRING;
DO_CALLBACK(STRING, PUSH);
} else {
/* hash key */
if (jsn->expecting != '"') {
INVOKE_ERROR(STRAY_TOKEN);
}
jsn->tok_last = 0;
jsn->expecting = ':';
STACK_PUSH;
state->type = JSONSL_T_HKEY;
DO_CALLBACK(HKEY, PUSH);
}
goto GT_NEXT;
case JSONSL_T_LIST:
state->nelem++;
STACK_PUSH;
state->type = JSONSL_T_STRING;
jsn->expecting = ',';
jsn->tok_last = 0;
DO_CALLBACK(STRING, PUSH);
goto GT_NEXT;
case JSONSL_T_SPECIAL:
INVOKE_ERROR(STRAY_TOKEN);
break;
default:
INVOKE_ERROR(STRING_OUTSIDE_CONTAINER);
break;
} /* switch(state->type) */
} else if (CUR_CHAR == '\\') {
GT_ESCAPE:
INCR_METRIC(ESCAPES);
/* Escape */
if ( (state->type & JSONSL_Tf_STRINGY) == 0 ) {
INVOKE_ERROR(ESCAPE_OUTSIDE_STRING);
}
state->nescapes++;
jsn->in_escape = 1;
goto GT_NEXT;
} /* " or \ */
GT_STRUCTURAL_TOKEN:
switch (CUR_CHAR) {
case ':':
INCR_METRIC(STRUCTURAL_TOKEN);
if (jsn->expecting != CUR_CHAR) {
INVOKE_ERROR(STRAY_TOKEN);
}
jsn->tok_last = ':';
jsn->can_insert = 1;
jsn->expecting = '"';
goto GT_NEXT;
case ',':
INCR_METRIC(STRUCTURAL_TOKEN);
/**
* The comma is one of the more generic tokens.
* In the context of an OBJECT, the can_insert flag
* should never be set, and no other action is
* necessary.
*/
if (jsn->expecting != CUR_CHAR) {
/* make this branch execute only when we haven't manually
* just placed the ',' in the expecting register.
*/
INVOKE_ERROR(STRAY_TOKEN);
}
if (state->type == JSONSL_T_OBJECT) {
/* end of hash value, expect a string as a hash key */
jsn->expecting = '"';
} else {
jsn->can_insert = 1;
}
jsn->tok_last = ',';
jsn->expecting = '"';
goto GT_NEXT;
/* new list or object */
/* hashes are more common */
case '{':
case '[':
INCR_METRIC(STRUCTURAL_TOKEN);
if (!jsn->can_insert) {
INVOKE_ERROR(CANT_INSERT);
}
ENSURE_HVAL;
state->nelem++;
STACK_PUSH;
/* because the constants match the opening delimiters, we can do this: */
state->type = CUR_CHAR;
state->nelem = 0;
jsn->can_insert = 1;
if (CUR_CHAR == '{') {
/* If we're a hash, we expect a key first, which is quouted */
jsn->expecting = '"';
}
if (CUR_CHAR == JSONSL_T_OBJECT) {
DO_CALLBACK(OBJECT, PUSH);
} else {
DO_CALLBACK(LIST, PUSH);
}
jsn->tok_last = 0;
goto GT_NEXT;
/* closing of list or object */
case '}':
case ']':
INCR_METRIC(STRUCTURAL_TOKEN);
if (jsn->tok_last == ',' && jsn->options.allow_trailing_comma == 0) {
INVOKE_ERROR(TRAILING_COMMA);
}
jsn->can_insert = 0;
jsn->level--;
jsn->expecting = ',';
jsn->tok_last = 0;
if (CUR_CHAR == ']') {
if (state->type != '[') {
INVOKE_ERROR(BRACKET_MISMATCH);
}
DO_CALLBACK(LIST, POP);
} else {
if (state->type != '{') {
INVOKE_ERROR(BRACKET_MISMATCH);
}
DO_CALLBACK(OBJECT, POP);
}
state = jsn->stack + jsn->level;
state->pos_cur = jsn->pos;
goto GT_NEXT;
default:
GT_SPECIAL_BEGIN:
/**
* Not a string, not a structural token, and not benign whitespace.
* Technically we should iterate over the character always, but since
* we are not doing full numerical/value decoding anyway (but only hinting),
* we only check upon entry.
*/
if (state->type != JSONSL_T_SPECIAL) {
int special_flags = extract_special(CUR_CHAR);
if (!special_flags) {
/**
* Try to do some heuristics here anyway to figure out what kind of
* error this is. The 'special' case is a fallback scenario anyway.
*/
if (CUR_CHAR == '\0') {
INVOKE_ERROR(FOUND_NULL_BYTE);
} else if (CUR_CHAR < 0x20) {
INVOKE_ERROR(WEIRD_WHITESPACE);
} else {
INVOKE_ERROR(SPECIAL_EXPECTED);
}
}
ENSURE_HVAL;
state->nelem++;
if (!jsn->can_insert) {
INVOKE_ERROR(CANT_INSERT);
}
STACK_PUSH;
state->type = JSONSL_T_SPECIAL;
state->special_flags = special_flags;
if (special_flags == JSONSL_SPECIALf_UNSIGNED) {
state->nelem = CUR_CHAR - 0x30;
} else {
state->nelem = 0;
}
DO_CALLBACK(SPECIAL, PUSH);
}
goto GT_NEXT;
}
GT_NEXT:
continue;
}
}
JSONSL_API
const char* jsonsl_strerror(jsonsl_error_t err)
{
#define X(t) \
if (err == JSONSL_ERROR_##t) \
return #t;
JSONSL_XERR;
#undef X
return "<UNKNOWN_ERROR>";
}
JSONSL_API
const char *jsonsl_strtype(jsonsl_type_t type)
{
#define X(o,c) \
if (type == JSONSL_T_##o) \
return #o;
JSONSL_XTYPE
#undef X
return "UNKNOWN TYPE";
}
/*
*
* JPR/JSONPointer functions
*
*
*/
#ifndef JSONSL_NO_JPR
static
jsonsl_jpr_type_t
populate_component(char *in,
struct jsonsl_jpr_component_st *component,
char **next,
jsonsl_error_t *errp)
{
unsigned long pctval;
char *c = NULL, *outp = NULL, *end = NULL;
size_t input_len;
jsonsl_jpr_type_t ret = JSONSL_PATH_NONE;
if (*next == NULL || *(*next) == '\0') {
return JSONSL_PATH_NONE;
}
/* Replace the next / with a NULL */
*next = strstr(in, "/");
if (*next != NULL) {
*(*next) = '\0'; /* drop the forward slash */
input_len = *next - in;
end = *next;
*next += 1; /* next character after the '/' */
} else {
input_len = strlen(in);
end = in + input_len + 1;
}
component->pstr = in;
/* Check for special components of interest */
if (*in == JSONSL_PATH_WILDCARD_CHAR && input_len == 1) {
/* Lone wildcard */
ret = JSONSL_PATH_WILDCARD;
goto GT_RET;
} else if (isdigit(*in)) {
/* ASCII Numeric */
char *endptr;
component->idx = strtoul(in, &endptr, 10);
if (endptr && *endptr == '\0') {
ret = JSONSL_PATH_NUMERIC;
goto GT_RET;
}
}
/* Default, it's a string */
ret = JSONSL_PATH_STRING;
for (c = outp = in; c < end; c++, outp++) {
char origc;
if (*c != '%') {
goto GT_ASSIGN;
}
/*
* c = { [+0] = '%', [+1] = 'b', [+2] = 'e', [+3] = '\0' }
*/
/* Need %XX */
if (c+2 >= end) {
*errp = JSONSL_ERROR_PERCENT_BADHEX;
return JSONSL_PATH_INVALID;
}
if (! (isxdigit(*(c+1)) && isxdigit(*(c+2))) ) {
*errp = JSONSL_ERROR_PERCENT_BADHEX;
return JSONSL_PATH_INVALID;
}
/* Temporarily null-terminate the characters */
origc = *(c+3);
*(c+3) = '\0';
pctval = strtoul(c+1, NULL, 16);
*(c+3) = origc;
*outp = (char) pctval;
c += 2;
continue;
GT_ASSIGN:
*outp = *c;
}
/* Null-terminate the string */
for (; outp < c; outp++) {
*outp = '\0';
}
GT_RET:
component->ptype = ret;
if (ret != JSONSL_PATH_WILDCARD) {
component->len = strlen(component->pstr);
}
return ret;
}
JSONSL_API
jsonsl_jpr_t
jsonsl_jpr_new(const char *path, jsonsl_error_t *errp)
{
char *my_copy;
int count, curidx;
struct jsonsl_jpr_st *ret;
struct jsonsl_jpr_component_st *components;
size_t origlen;
jsonsl_error_t errstacked;
if (errp == NULL) {
errp = &errstacked;
}
if (path == NULL || *path != '/') {
*errp = JSONSL_ERROR_JPR_NOROOT;
return NULL;
}
count = 1;
path++;
{
const char *c = path;
for (; *c; c++) {
if (*c == '/') {
count++;
if (*(c+1) == '/') {
*errp = JSONSL_ERROR_JPR_DUPSLASH;
return NULL;
}
}
}
}
if(*path) {
count++;
}
components = malloc(sizeof(*components) * count);
my_copy = malloc(strlen(path) + 1);
strcpy(my_copy, path);
components[0].ptype = JSONSL_PATH_ROOT;
if (*my_copy) {
char *cur = my_copy;
int pathret = JSONSL_PATH_STRING;
curidx = 1;
while (pathret > 0 && curidx < count) {
pathret = populate_component(cur, components + curidx, &cur, errp);
if (pathret > 0) {
curidx++;
} else {
break;
}
}
if (pathret == JSONSL_PATH_INVALID) {
free(components);
free(my_copy);
return NULL;
}
} else {
curidx = 1;
}
path--; /*revert path to leading '/' */
origlen = strlen(path) + 1;
ret = malloc(sizeof(*ret));
ret->components = components;
ret->ncomponents = curidx;
ret->basestr = my_copy;
ret->orig = malloc(origlen);
ret->norig = origlen-1;
strcpy(ret->orig, path);
return ret;
}
void jsonsl_jpr_destroy(jsonsl_jpr_t jpr)
{
free(jpr->components);
free(jpr->basestr);
free(jpr->orig);
free(jpr);
}
JSONSL_API
jsonsl_jpr_match_t
jsonsl_jpr_match(jsonsl_jpr_t jpr,
jsonsl_type_t parent_type,
unsigned int parent_level,
const char *key,
size_t nkey)
{
/* find our current component. This is the child level */
int cmpret;
struct jsonsl_jpr_component_st *p_component;
p_component = jpr->components + parent_level;
if (parent_level >= jpr->ncomponents) {
return JSONSL_MATCH_NOMATCH;
}
/* Lone query for 'root' element. Always matches */
if (parent_level == 0) {
if (jpr->ncomponents == 1) {
return JSONSL_MATCH_COMPLETE;
} else {
return JSONSL_MATCH_POSSIBLE;
}
}
/* Wildcard, always matches */
if (p_component->ptype == JSONSL_PATH_WILDCARD) {
if (parent_level == jpr->ncomponents-1) {
return JSONSL_MATCH_COMPLETE;
} else {
return JSONSL_MATCH_POSSIBLE;
}
}
/* Check numeric array index */
if (p_component->ptype == JSONSL_PATH_NUMERIC
&& parent_type == JSONSL_T_LIST) {
if (p_component->idx != nkey) {
return JSONSL_MATCH_NOMATCH;
} else {
if (parent_level == jpr->ncomponents-1) {
return JSONSL_MATCH_COMPLETE;
} else {
return JSONSL_MATCH_POSSIBLE;
}
}
}
/* Check lengths */
if (p_component->len != nkey) {
return JSONSL_MATCH_NOMATCH;
}
/* Check string comparison */
cmpret = strncmp(p_component->pstr, key, nkey);
if (cmpret != 0) {
return JSONSL_MATCH_NOMATCH;
} else {
if (parent_level == jpr->ncomponents-1) {
return JSONSL_MATCH_COMPLETE;
} else {
return JSONSL_MATCH_POSSIBLE;
}
}
/* Never reached, but make the compiler happy */
abort();
return JSONSL_MATCH_NOMATCH;
}
JSONSL_API
void jsonsl_jpr_match_state_init(jsonsl_t jsn,
jsonsl_jpr_t *jprs,
size_t njprs)
{
size_t ii, *firstjmp;
if (njprs == 0) {
return;
}
jsn->jprs = malloc(sizeof(jsonsl_jpr_t) * njprs);
jsn->jpr_count = njprs;
jsn->jpr_root = calloc(1, sizeof(size_t) * njprs * jsn->levels_max);
memcpy(jsn->jprs, jprs, sizeof(jsonsl_jpr_t) * njprs);
/* Set the initial jump table values */
firstjmp = jsn->jpr_root;
for (ii = 0; ii < njprs; ii++) {
firstjmp[ii] = ii+1;
}
}
JSONSL_API
void jsonsl_jpr_match_state_cleanup(jsonsl_t jsn)
{
if (jsn->jpr_count == 0) {
return;
}
free(jsn->jpr_root);
free(jsn->jprs);
jsn->jprs = NULL;
jsn->jpr_root = NULL;
jsn->jpr_count = 0;
}
/**
* This function should be called exactly once on each element...
* This should also be called in recursive order, since we rely
* on the parent having been initalized for a match.
*
* Since the parent is checked for a match as well, we maintain a 'serial' counter.
* Whenever we traverse an element, we expect the serial to be the same as a global
* integer. If they do not match, we re-initialize the context, and set the serial.
*
* This ensures a type of consistency without having a proactive reset by the
* main lexer itself.
*
*/
JSONSL_API
jsonsl_jpr_t jsonsl_jpr_match_state(jsonsl_t jsn,
struct jsonsl_state_st *state,
const char *key,
size_t nkey,
jsonsl_jpr_match_t *out)
{
struct jsonsl_state_st *parent_state;
jsonsl_jpr_t ret = NULL;
/* Jump and JPR tables for our own state and the parent state */
size_t *jmptable, *pjmptable;
size_t jmp_cur, ii, ourjmpidx;
if (!jsn->jpr_root) {
*out = JSONSL_MATCH_NOMATCH;
return NULL;
}
pjmptable = jsn->jpr_root + (jsn->jpr_count * (state->level-1));
jmptable = pjmptable + jsn->jpr_count;
/* If the parent cannot match, then invalidate it */
if (*pjmptable == 0) {
*jmptable = 0;
*out = JSONSL_MATCH_NOMATCH;
return NULL;
}
parent_state = jsn->stack + state->level - 1;
if (parent_state->type == JSONSL_T_LIST) {
nkey = (size_t) parent_state->nelem;
}
*jmptable = 0;
ourjmpidx = 0;
memset(jmptable, 0, sizeof(int) * jsn->jpr_count);
for (ii = 0; ii < jsn->jpr_count; ii++) {
jmp_cur = pjmptable[ii];
if (jmp_cur) {
jsonsl_jpr_t jpr = jsn->jprs[jmp_cur-1];
*out = jsonsl_jpr_match(jpr,
parent_state->type,
parent_state->level,
key, nkey);
if (*out == JSONSL_MATCH_COMPLETE) {
ret = jpr;
*jmptable = 0;
return ret;
} else if (*out == JSONSL_MATCH_POSSIBLE) {
jmptable[ourjmpidx] = ii+1;
ourjmpidx++;
}
} else {
break;
}
}
if (!*jmptable) {
*out = JSONSL_MATCH_NOMATCH;
}
return NULL;
}
JSONSL_API
const char *jsonsl_strmatchtype(jsonsl_jpr_match_t match)
{
#define X(T,v) \
if ( match == JSONSL_MATCH_##T ) \
return #T;
JSONSL_XMATCH
#undef X
return "<UNKNOWN>";
}
#endif /* JSONSL_WITH_JPR */
/**
* Maps literal escape sequences with special meaning to their
* actual control codes (e.g.\n => 0x20)
*/
static unsigned char *Escape_Maps;
/**
* Utility function to convert escape sequences
*/
JSONSL_API
size_t jsonsl_util_unescape_ex(const char *in,
char *out,
size_t len,
const int toEscape[128],
jsonsl_special_t *oflags,
jsonsl_error_t *err,
const char **errat)
{
const unsigned char *c = (const unsigned char*)in;
int in_escape = 0;
size_t origlen = len;
/* difference between the length of the input buffer and the output buffer */
size_t ndiff = 0;
if (oflags) {
*oflags = 0;
}
#define UNESCAPE_BAIL(e,offset) \
*err = JSONSL_ERROR_##e; \
if (errat) { \
*errat = (const char*)(c+ (ptrdiff_t)(offset)); \
} \
return 0;
for (; len; len--, c++, out++) {
unsigned int uesc_val[2];
if (in_escape) {
/* inside a previously ignored escape. Ignore */
in_escape = 0;
goto GT_ASSIGN;
}
if (*c != '\\') {
/* Not an escape, so we don't care about this */
goto GT_ASSIGN;
}
if (len < 2) {
UNESCAPE_BAIL(ESCAPE_INVALID, 0);
}
if (!is_allowed_escape(c[1])) {
UNESCAPE_BAIL(ESCAPE_INVALID, 1)
}
if ((toEscape[(unsigned char)c[1] & 0x7f] == 0 &&
c[1] != '\\' && c[1] != '"')) {
/* if we don't want to unescape this string, just continue with
* the escape flag set
*/
in_escape = 1;
goto GT_ASSIGN;
}
if (c[1] != 'u') {
/* simple skip-and-replace using pre-defined maps.
* TODO: should the maps actually reflect the desired
* replacement character in toEscape?
*/
if (Escape_Maps[c[1]]) {
/* Check if there is a corresponding replacement */
*out = Escape_Maps[c[1]];
} else {
/* Just gobble up the 'reverse-solidus' */
*out = c[1];
}
len--;
ndiff++;
c++;
/* do not assign, just continue */
continue;
}
/* next == 'u' */
if (len < 6) {
/* Need at least six characters:
* { [0] = '\\', [1] = 'u', [2] = 'f', [3] = 'f', [4] = 'f', [5] = 'f' }
*/
UNESCAPE_BAIL(UESCAPE_TOOSHORT, -1);
}
if (sscanf((const char*)(c+2), "%02x%02x", uesc_val, uesc_val+1) != 2) {
/* We treat the sequence as two octets */
UNESCAPE_BAIL(UESCAPE_TOOSHORT, -1);
}
/* By now, we gobble up all the six bytes (current implied + 5 next
* characters), and have at least four missing bytes from the output
* buffer.
*/
len -= 5;
c += 5;
ndiff += 4;
if (uesc_val[0] == 0) {
/* only one byte is extracted from the two
* possible octets. Increment the diff counter by one.
*/
*out = uesc_val[1];
if (oflags && *(unsigned char*)out > 0x7f) {
*oflags |= JSONSL_SPECIALf_NONASCII;
}
ndiff++;
} else {
*(out++) = uesc_val[0];
*out = uesc_val[1];
if (oflags && (uesc_val[0] > 0x7f || uesc_val[1] > 0x7f)) {
*oflags |= JSONSL_SPECIALf_NONASCII;
}
}
continue;
/* Only reached by previous branches */
GT_ASSIGN:
*out = *c;
}
*err = JSONSL_ERROR_SUCCESS;
return origlen - ndiff;
}
/**
* Character Table definitions.
* These were all generated via srcutil/genchartables.pl
*/
/**
* This table contains the beginnings of non-string
* allowable (bareword) values.
*/
static jsonsl_special_t _special_table[0x100] = {
/* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
/* 0x20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x2c */
/* 0x2d */ JSONSL_SPECIALf_SIGNED /* - */, /* 0x2d */
/* 0x2e */ 0,0, /* 0x2f */
/* 0x30 */ JSONSL_SPECIALf_UNSIGNED /* 0 */, /* 0x30 */
/* 0x31 */ JSONSL_SPECIALf_UNSIGNED /* 1 */, /* 0x31 */
/* 0x32 */ JSONSL_SPECIALf_UNSIGNED /* 2 */, /* 0x32 */
/* 0x33 */ JSONSL_SPECIALf_UNSIGNED /* 3 */, /* 0x33 */
/* 0x34 */ JSONSL_SPECIALf_UNSIGNED /* 4 */, /* 0x34 */
/* 0x35 */ JSONSL_SPECIALf_UNSIGNED /* 5 */, /* 0x35 */
/* 0x36 */ JSONSL_SPECIALf_UNSIGNED /* 6 */, /* 0x36 */
/* 0x37 */ JSONSL_SPECIALf_UNSIGNED /* 7 */, /* 0x37 */
/* 0x38 */ JSONSL_SPECIALf_UNSIGNED /* 8 */, /* 0x38 */
/* 0x39 */ JSONSL_SPECIALf_UNSIGNED /* 9 */, /* 0x39 */
/* 0x3a */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x59 */
/* 0x5a */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x65 */
/* 0x66 */ JSONSL_SPECIALf_FALSE /* f */, /* 0x66 */
/* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
/* 0x6e */ JSONSL_SPECIALf_NULL /* n */, /* 0x6e */
/* 0x6f */ 0,0,0,0,0, /* 0x73 */
/* 0x74 */ JSONSL_SPECIALf_TRUE /* t */, /* 0x74 */
/* 0x75 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x94 */
/* 0x95 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb4 */
/* 0xb5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd4 */
/* 0xd5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf4 */
/* 0xf5 */ 0,0,0,0,0,0,0,0,0,0 /* 0xfe */
};
static jsonsl_special_t *Special_table = _special_table;
/**
* Contains characters which signal the termination of any of the 'special' bareword
* values.
*/
static int _special_endings[0x100] = {
/* 0x00 */ 0,0,0,0,0,0,0,0,0, /* 0x08 */
/* 0x09 */ 1 /* <TAB> */, /* 0x09 */
/* 0x0a */ 1 /* <LF> */, /* 0x0a */
/* 0x0b */ 0,0, /* 0x0c */
/* 0x0d */ 1 /* <CR> */, /* 0x0d */
/* 0x0e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
/* 0x20 */ 1 /* <SP> */, /* 0x20 */
/* 0x21 */ 0, /* 0x21 */
/* 0x22 */ 1 /* " */, /* 0x22 */
/* 0x23 */ 0,0,0,0,0,0,0,0,0, /* 0x2b */
/* 0x2c */ 1 /* , */, /* 0x2c */
/* 0x2d */ 0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x39 */
/* 0x3a */ 1 /* : */, /* 0x3a */
/* 0x3b */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5a */
/* 0x5b */ 1 /* [ */, /* 0x5b */
/* 0x5c */ 1 /* \ */, /* 0x5c */
/* 0x5d */ 1 /* ] */, /* 0x5d */
/* 0x5e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x7a */
/* 0x7b */ 1 /* { */, /* 0x7b */
/* 0x7c */ 0, /* 0x7c */
/* 0x7d */ 1 /* } */, /* 0x7d */
/* 0x7e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x9d */
/* 0x9e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xbd */
/* 0xbe */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xdd */
/* 0xde */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xfd */
/* 0xfe */ 0 /* 0xfe */
};
static int *Special_Endings = _special_endings;
/**
* Contains allowable whitespace.
*/
static int _allowed_whitespace[0x100] = {
/* 0x00 */ 0,0,0,0,0,0,0,0,0, /* 0x08 */
/* 0x09 */ 1 /* <TAB> */, /* 0x09 */
/* 0x0a */ 1 /* <LF> */, /* 0x0a */
/* 0x0b */ 0,0, /* 0x0c */
/* 0x0d */ 1 /* <CR> */, /* 0x0d */
/* 0x0e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
/* 0x20 */ 1 /* <SP> */, /* 0x20 */
/* 0x21 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x40 */
/* 0x41 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x60 */
/* 0x61 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x80 */
/* 0x81 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xa0 */
/* 0xa1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xc0 */
/* 0xc1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xe0 */
/* 0xe1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* 0xfe */
};
static int *Allowed_Whitespace = _allowed_whitespace;
/**
* Allowable two-character 'common' escapes:
*/
static int _allowed_escapes[0x100] = {
/* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
/* 0x20 */ 0,0, /* 0x21 */
/* 0x22 */ 1 /* <"> */, /* 0x22 */
/* 0x23 */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x2e */
/* 0x2f */ 1 /* </> */, /* 0x2f */
/* 0x30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x4f */
/* 0x50 */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5b */
/* 0x5c */ 1 /* <\> */, /* 0x5c */
/* 0x5d */ 0,0,0,0,0, /* 0x61 */
/* 0x62 */ 1 /* <b> */, /* 0x62 */
/* 0x63 */ 0,0,0, /* 0x65 */
/* 0x66 */ 1 /* <f> */, /* 0x66 */
/* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
/* 0x6e */ 1 /* <n> */, /* 0x6e */
/* 0x6f */ 0,0,0, /* 0x71 */
/* 0x72 */ 1 /* <r> */, /* 0x72 */
/* 0x73 */ 0, /* 0x73 */
/* 0x74 */ 1 /* <t> */, /* 0x74 */
/* 0x75 */ 1 /* <u> */, /* 0x75 */
/* 0x76 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x95 */
/* 0x96 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb5 */
/* 0xb6 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd5 */
/* 0xd6 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf5 */
/* 0xf6 */ 0,0,0,0,0,0,0,0,0, /* 0xfe */
};
static int *Allowed_Escapes = _allowed_escapes;
static unsigned char _escape_maps[0x100] = {
/* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
/* 0x20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x3f */
/* 0x40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5f */
/* 0x60 */ 0,0, /* 0x61 */
/* 0x62 */ 8 /* <b> */, /* 0x62 */
/* 0x63 */ 0,0,0, /* 0x65 */
/* 0x66 */ 12 /* <f> */, /* 0x66 */
/* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
/* 0x6e */ 10 /* <n> */, /* 0x6e */
/* 0x6f */ 0,0,0, /* 0x71 */
/* 0x72 */ 13 /* <r> */, /* 0x72 */
/* 0x73 */ 0, /* 0x73 */
/* 0x74 */ 9 /* <t> */, /* 0x74 */
/* 0x75 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x94 */
/* 0x95 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb4 */
/* 0xb5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd4 */
/* 0xd5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf4 */
/* 0xf5 */ 0,0,0,0,0,0,0,0,0,0 /* 0xfe */
};
static unsigned char *Escape_Maps = _escape_maps;
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