[cycript.git] / sig / parse.cpp

/* Cycript - Remove Execution Server and Disassembler
 * Copyright (C) 2009  Jay Freeman (saurik)
*/

/* Modified BSD License {{{ */
/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* }}} */

#include <apr_strings.h>
#include "sig/parse.hpp"
#include "Error.hpp"

#include <cstdio>
#include <cstdlib>
#include <cstring>

namespace sig {

void Parse_(apr_pool_t *pool, struct Signature *signature, const char **name, char eos, Callback callback);
struct Type *Parse_(apr_pool_t *pool, const char **name, char eos, bool named, Callback callback);


/* XXX: I really screwed up this time */
void *prealloc_(apr_pool_t *pool, void *odata, size_t osize, size_t nsize) {
    void *ndata = apr_palloc(pool, nsize);
    memcpy(ndata, odata, osize);
    return ndata;
}

void Parse_(apr_pool_t *pool, struct Signature *signature, const char **name, char eos, Callback callback) {
    _assert(*name != NULL);

    // XXX: this is just a stupid check :(
    bool named(**name == '"');

    signature->elements = NULL;
    signature->count = 0;

    for (;;) {
        if (**name == eos) {
            ++*name;
            return;
        }

        signature->elements = (struct Element *) prealloc_(pool, signature->elements, signature->count * sizeof(struct Element), (signature->count + 1) * sizeof(struct Element));
        _assert(signature->elements != NULL);

        struct Element *element = &signature->elements[signature->count++];

        if (**name != '"')
            element->name = NULL;
        else {
            char *quote = strchr(++*name, '"');
            element->name = apr_pstrmemdup(pool, *name, quote - *name);
            *name = quote + 1;
        }

        element->type = Parse_(pool, name, eos, named, callback);

        if (**name < '0' || **name > '9')
            element->offset = _not(size_t);
        else {
            element->offset = 0;

            do
                element->offset = element->offset * 10 + (*(*name)++ - '0');
            while (**name >= '0' && **name <= '9');
        }
    }
}

struct Type *Parse_(apr_pool_t *pool, const char **name, char eos, bool named, Callback callback) {
    char next = *(*name)++;
    if (next == '?')
        return NULL;

    struct Type *type = (struct Type *) apr_palloc(pool, sizeof(struct Type));
    _assert(type != NULL);
    memset(type, 0, sizeof(struct Type));

  parse:
    switch (next) {
        case '#': type->primitive = typename_P; break;

        case '(':
            if (type->data.signature.count < 2)
                type->primitive = struct_P;
            else
                type->primitive = union_P;
            next = ')';
        goto aggregate;

        case '*': type->primitive = string_P; break;
        case ':': type->primitive = selector_P; break;

        case '@':
            if (**name == '"') {
                char *quote = strchr(*name + 1, '"');
                if (!named || quote[1] == eos || quote[1] == '"') {
                    type->name = apr_pstrmemdup(pool, *name + 1, quote - *name - 1);
                    *name = quote + 1;
                }
            }

            type->primitive = object_P;
        break;

        case 'B': type->primitive = boolean_P; break;
        case 'C': type->primitive = uchar_P; break;
        case 'I': type->primitive = uint_P; break;
        case 'L': type->primitive = ulong_P; break;
        case 'Q': type->primitive = ulonglong_P; break;
        case 'S': type->primitive = ushort_P; break;

        case '[':
            type->primitive = array_P;
            type->data.data.size = strtoul(*name, (char **) name, 10);
            type->data.data.type = Parse_(pool, name, eos, false, callback);
            if (**name != ']') {
                printf("']' != \"%s\"\n", *name);
                _assert(false);
            }
            ++*name;
        break;

        case '^':
            type->primitive = pointer_P;
            if (**name == '"') {
                type->data.data.type = NULL;
            } else {
                type->data.data.type = Parse_(pool, name, eos, named, callback);
                sig::Type *&target(type->data.data.type);
                if (target != NULL && target->primitive == void_P)
                    target = NULL;
            }
        break;

        case 'b':
            type->primitive = bit_P;
            type->data.data.size = strtoul(*name, (char **) name, 10);
        break;

        case 'c': type->primitive = char_P; break;
        case 'd': type->primitive = double_P; break;
        case 'f': type->primitive = float_P; break;
        case 'i': type->primitive = int_P; break;
        case 'l': type->primitive = long_P; break;
        case 'q': type->primitive = longlong_P; break;
        case 's': type->primitive = short_P; break;
        case 'v': type->primitive = void_P; break;

        case '{':
            type->primitive = struct_P;
            next = '}';
        goto aggregate;

        aggregate: {
            char end = next;
            const char *begin = *name;
            do next = *(*name)++;
            while (
                next != '=' &&
                next != '}'
            );
            size_t length = *name - begin - 1;
            if (strncmp(begin, "?", length) != 0)
                type->name = (char *) apr_pstrmemdup(pool, begin, length);
            else
                type->name = NULL;

            // XXX: this types thing is a throwback to JocStrap

            char *types;
            if (next != '=') {
                types = NULL;
            } else {
                const char *temp(*name);
                Parse_(pool, &type->data.signature, name, end, callback);
                types = (char *) apr_pstrmemdup(pool, temp, *name - temp - 1);
            }

            if (callback != NULL)
                (*callback)(pool, type->name, types, type);
        } break;

        case 'N': type->flags |= JOC_TYPE_INOUT; goto next;
        case 'n': type->flags |= JOC_TYPE_IN; goto next;
        case 'O': type->flags |= JOC_TYPE_BYCOPY; goto next;
        case 'o': type->flags |= JOC_TYPE_OUT; goto next;
        case 'R': type->flags |= JOC_TYPE_BYREF; goto next;
        case 'r': type->flags |= JOC_TYPE_CONST; goto next;
        case 'V': type->flags |= JOC_TYPE_ONEWAY; goto next;

        next:
            next = *(*name)++;
            goto parse;
        break;

        default:
            printf("invalid type character: '%c' {%s}\n", next, *name - 10);
            _assert(false);
    }

    return type;
}

void Parse(apr_pool_t *pool, struct Signature *signature, const char *name, Callback callback) {
    const char *temp = name;
    Parse_(pool, signature, &temp, '\0', callback);
    _assert(temp[-1] == '\0');
}

const char *Unparse(apr_pool_t *pool, struct Signature *signature) {
    const char *value = "";
    size_t offset;

    for (offset = 0; offset != signature->count; ++offset) {
        const char *type = Unparse(pool, signature->elements[offset].type);
        value = apr_pstrcat(pool, value, type, NULL);
    }

    return value;
}

const char *Unparse(apr_pool_t *pool, struct Type *type) {
    if (type == NULL)
        return "?";
    else switch (type->primitive) {
        case typename_P: return "#";
        case union_P: return apr_psprintf(pool, "(%s)", Unparse(pool, &type->data.signature));
        case string_P: return "*";
        case selector_P: return ":";
        case object_P: return type->name == NULL ? "@" : apr_psprintf(pool, "@\"%s\"", type->name);
        case boolean_P: return "B";
        case uchar_P: return "C";
        case uint_P: return "I";
        case ulong_P: return "L";
        case ulonglong_P: return "Q";
        case ushort_P: return "S";

        case array_P: {
            const char *value = Unparse(pool, type->data.data.type);
            return apr_psprintf(pool, "[%zu%s]", type->data.data.size, value);
        } break;

        case pointer_P: return apr_psprintf(pool, "^%s", type->data.data.type == NULL ? "v" : Unparse(pool, type->data.data.type));
        case bit_P: return apr_psprintf(pool, "b%zu", type->data.data.size);
        case char_P: return "c";
        case double_P: return "d";
        case float_P: return "f";
        case int_P: return "i";
        case long_P: return "l";
        case longlong_P: return "q";
        case short_P: return "s";
        case void_P: return "v";
        case struct_P: return apr_psprintf(pool, "{%s=%s}", type->name == NULL ? "?" : type->name, Unparse(pool, &type->data.signature));
    }

    _assert(false);
    return NULL;
}

}
Commit	Line	Data
b4aa79af JF	1	/* Cycript - Remove Execution Server and Disassembler
	2	* Copyright (C) 2009 Jay Freeman (saurik)
	3	*/
	4
	5	/* Modified BSD License {{{ */
	6	/*
	7	* Redistribution and use in source and binary
	8	* forms, with or without modification, are permitted
	9	* provided that the following conditions are met:
	10	*
	11	* 1. Redistributions of source code must retain the
	12	* above copyright notice, this list of conditions
	13	* and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the
	15	* above copyright notice, this list of conditions
	16	* and the following disclaimer in the documentation
	17	* and/or other materials provided with the
	18	* distribution.
	19	* 3. The name of the author may not be used to endorse
	20	* or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
	24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
	25	* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	29	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	30	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	31	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	32	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	33	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
	34	* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
	35	* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	36	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	37	*/
	38	/* }}} */
	39
9185d5ef	40	#include <apr_strings.h>
ea2d184c	41	#include "sig/parse.hpp"
37954781 JF	42	#include "Error.hpp"
	43
	44	#include <cstdio>
	45	#include <cstdlib>
	46	#include <cstring>
ea2d184c JF	47
	48	namespace sig {
	49
f33b048a JF	50	void Parse_(apr_pool_t pool, struct Signature signature, const char **name, char eos, Callback callback);
f33b048a JF	51	struct Type Parse_(apr_pool_t pool, const char **name, char eos, bool named, Callback callback);
b21525c7 JF	52
b21525c7 JF	53
ea2d184c JF	54	/* XXX: I really screwed up this time */
	55	void prealloc_(apr_pool_t pool, void *odata, size_t osize, size_t nsize) {
	56	void *ndata = apr_palloc(pool, nsize);
	57	memcpy(ndata, odata, osize);
	58	return ndata;
	59	}
	60
f33b048a	61	void Parse_(apr_pool_t pool, struct Signature signature, const char **name, char eos, Callback callback) {
ea2d184c JF	62	_assert(*name != NULL);
ea2d184c JF	63
f33b048a JF	64	// XXX: this is just a stupid check :(
f33b048a JF	65	bool named(**name == '"');
ea2d184c JF	66
	67	signature->elements = NULL;
	68	signature->count = 0;
	69
	70	for (;;) {
	71	if (**name == eos) {
	72	++*name;
	73	return;
	74	}
	75
	76	signature->elements = (struct Element ) prealloc_(pool, signature->elements, signature->count sizeof(struct Element), (signature->count + 1) * sizeof(struct Element));
	77	_assert(signature->elements != NULL);
	78
	79	struct Element *element = &signature->elements[signature->count++];
	80
	81	if (**name != '"')
	82	element->name = NULL;
	83	else {
	84	char quote = strchr(++name, '"');
	85	element->name = apr_pstrmemdup(pool, name, quote - name);
	86	*name = quote + 1;
	87	}
	88
f33b048a	89	element->type = Parse_(pool, name, eos, named, callback);
ea2d184c JF	90
	91	if (name < '0' \|\| name > '9')
	92	element->offset = _not(size_t);
	93	else {
	94	element->offset = 0;
	95
	96	do
	97	element->offset = element->offset * 10 + ((name)++ - '0');
	98	while (name >= '0' && name <= '9');
	99	}
	100	}
	101	}
	102
f33b048a	103	struct Type Parse_(apr_pool_t pool, const char **name, char eos, bool named, Callback callback) {
ea2d184c JF	104	char next = (name)++;
	105	if (next == '?')
	106	return NULL;
	107
	108	struct Type type = (struct Type ) apr_palloc(pool, sizeof(struct Type));
	109	_assert(type != NULL);
	110	memset(type, 0, sizeof(struct Type));
	111
	112	parse:
	113	switch (next) {
	114	case '#': type->primitive = typename_P; break;
	115
	116	case '(':
d63c39cc JF	117	if (type->data.signature.count < 2)
	118	type->primitive = struct_P;
	119	else
	120	type->primitive = union_P;
ea2d184c JF	121	next = ')';
	122	goto aggregate;
	123
	124	case '*': type->primitive = string_P; break;
	125	case ':': type->primitive = selector_P; break;
	126
	127	case '@':
	128	if (**name == '"') {
	129	char quote = strchr(name + 1, '"');
	130	if (!named \|\| quote[1] == eos \|\| quote[1] == '"') {
	131	type->name = apr_pstrmemdup(pool, name + 1, quote - name - 1);
	132	*name = quote + 1;
	133	}
	134	}
	135
	136	type->primitive = object_P;
	137	break;
	138
	139	case 'B': type->primitive = boolean_P; break;
	140	case 'C': type->primitive = uchar_P; break;
	141	case 'I': type->primitive = uint_P; break;
	142	case 'L': type->primitive = ulong_P; break;
	143	case 'Q': type->primitive = ulonglong_P; break;
	144	case 'S': type->primitive = ushort_P; break;
	145
	146	case '[':
	147	type->primitive = array_P;
	148	type->data.data.size = strtoul(name, (char *) name, 10);
f33b048a	149	type->data.data.type = Parse_(pool, name, eos, false, callback);
ea2d184c JF	150	if (**name != ']') {
	151	printf("']' != \"%s\"\n", *name);
	152	_assert(false);
	153	}
	154	++*name;
	155	break;
	156
	157	case '^':
	158	type->primitive = pointer_P;
61933e16	159	if (**name == '"') {
ea2d184c JF	160	type->data.data.type = NULL;
ea2d184c JF	161	} else {
f33b048a	162	type->data.data.type = Parse_(pool, name, eos, named, callback);
3a1b79a7 JF	163	sig::Type *&target(type->data.data.type);
	164	if (target != NULL && target->primitive == void_P)
	165	target = NULL;
ea2d184c JF	166	}
	167	break;
	168
	169	case 'b':
	170	type->primitive = bit_P;
	171	type->data.data.size = strtoul(name, (char *) name, 10);
	172	break;
	173
	174	case 'c': type->primitive = char_P; break;
	175	case 'd': type->primitive = double_P; break;
	176	case 'f': type->primitive = float_P; break;
	177	case 'i': type->primitive = int_P; break;
	178	case 'l': type->primitive = long_P; break;
	179	case 'q': type->primitive = longlong_P; break;
	180	case 's': type->primitive = short_P; break;
	181	case 'v': type->primitive = void_P; break;
	182
	183	case '{':
	184	type->primitive = struct_P;
	185	next = '}';
	186	goto aggregate;
	187
	188	aggregate: {
	189	char end = next;
	190	const char begin = name;
	191	do next = (name)++;
	192	while (
	193	next != '=' &&
	194	next != '}'
	195	);
	196	size_t length = *name - begin - 1;
	197	if (strncmp(begin, "?", length) != 0)
	198	type->name = (char *) apr_pstrmemdup(pool, begin, length);
	199	else
	200	type->name = NULL;
	201
f33b048a JF	202	// XXX: this types thing is a throwback to JocStrap
f33b048a JF	203
ea2d184c	204	char *types;
f33b048a	205	if (next != '=') {
ea2d184c	206	types = NULL;
f33b048a JF	207	} else {
	208	const char temp(name);
	209	Parse_(pool, &type->data.signature, name, end, callback);
ea2d184c JF	210	types = (char ) apr_pstrmemdup(pool, temp, name - temp - 1);
	211	}
	212
f33b048a JF	213	if (callback != NULL)
f33b048a JF	214	(*callback)(pool, type->name, types, type);
ea2d184c JF	215	} break;
	216
	217	case 'N': type->flags \|= JOC_TYPE_INOUT; goto next;
	218	case 'n': type->flags \|= JOC_TYPE_IN; goto next;
	219	case 'O': type->flags \|= JOC_TYPE_BYCOPY; goto next;
	220	case 'o': type->flags \|= JOC_TYPE_OUT; goto next;
	221	case 'R': type->flags \|= JOC_TYPE_BYREF; goto next;
	222	case 'r': type->flags \|= JOC_TYPE_CONST; goto next;
	223	case 'V': type->flags \|= JOC_TYPE_ONEWAY; goto next;
	224
	225	next:
	226	next = (name)++;
	227	goto parse;
	228	break;
	229
	230	default:
	231	printf("invalid type character: '%c' {%s}\n", next, *name - 10);
	232	_assert(false);
	233	}
	234
	235	return type;
	236	}
	237
f33b048a	238	void Parse(apr_pool_t pool, struct Signature signature, const char *name, Callback callback) {
ea2d184c	239	const char *temp = name;
f33b048a	240	Parse_(pool, signature, &temp, '\0', callback);
ea2d184c JF	241	_assert(temp[-1] == '\0');
	242	}
	243
b21525c7	244	const char Unparse(apr_pool_t pool, struct Signature *signature) {
ea2d184c JF	245	const char *value = "";
	246	size_t offset;
	247
	248	for (offset = 0; offset != signature->count; ++offset) {
b21525c7	249	const char *type = Unparse(pool, signature->elements[offset].type);
ea2d184c JF	250	value = apr_pstrcat(pool, value, type, NULL);
	251	}
	252
	253	return value;
	254	}
	255
b21525c7	256	const char Unparse(apr_pool_t pool, struct Type *type) {
ea2d184c JF	257	if (type == NULL)
	258	return "?";
	259	else switch (type->primitive) {
	260	case typename_P: return "#";
b21525c7	261	case union_P: return apr_psprintf(pool, "(%s)", Unparse(pool, &type->data.signature));
ea2d184c JF	262	case string_P: return "*";
	263	case selector_P: return ":";
	264	case object_P: return type->name == NULL ? "@" : apr_psprintf(pool, "@\"%s\"", type->name);
	265	case boolean_P: return "B";
	266	case uchar_P: return "C";
	267	case uint_P: return "I";
	268	case ulong_P: return "L";
	269	case ulonglong_P: return "Q";
	270	case ushort_P: return "S";
	271
	272	case array_P: {
b21525c7	273	const char *value = Unparse(pool, type->data.data.type);
272a0dd4	274	return apr_psprintf(pool, "[%zu%s]", type->data.data.size, value);
ea2d184c JF	275	} break;
ea2d184c JF	276
cbaa5f0f	277	case pointer_P: return apr_psprintf(pool, "^%s", type->data.data.type == NULL ? "v" : Unparse(pool, type->data.data.type));
ea2d184c JF	278	case bit_P: return apr_psprintf(pool, "b%zu", type->data.data.size);
	279	case char_P: return "c";
	280	case double_P: return "d";
	281	case float_P: return "f";
	282	case int_P: return "i";
	283	case long_P: return "l";
	284	case longlong_P: return "q";
	285	case short_P: return "s";
	286	case void_P: return "v";
b21525c7	287	case struct_P: return apr_psprintf(pool, "{%s=%s}", type->name == NULL ? "?" : type->name, Unparse(pool, &type->data.signature));
ea2d184c JF	288	}
	289
	290	_assert(false);
	291	return NULL;
	292	}
	293
	294	}