Momentum-Apps/fields.c

/* Copyright (C) 2022-2023 Salvatore Sanfilippo -- All Rights Reserved
 * See the LICENSE file for information about the license.
 *
 * Protocol fields implementation. */

#include "app.h"

/* Create a new field of the specified type. Without populating its
 * type-specific value. */
static ProtoViewField *field_new(ProtoViewFieldType type, const char *name) {
    ProtoViewField *f = malloc(sizeof(*f));
    f->type = type;
    f->name = strdup(name);
    return f;
}

/* Free a field an associated data. */
static void field_free(ProtoViewField *f) {
    free(f->name);
    switch(f->type) {
    case FieldTypeStr: free(f->str); break;
    case FieldTypeBytes: free(f->bytes); break;
    default: break; // Nothing to free for other types.
    }
    free(f);
}

/* Return the type of the field as string. */
const char *field_get_type_name(ProtoViewField *f) {
    switch(f->type) {
    case FieldTypeStr:          return "str";
    case FieldTypeSignedInt:    return "int";
    case FieldTypeUnsignedInt:  return "uint";
    case FieldTypeBinary:       return "bin";
    case FieldTypeHex:          return "hex";
    case FieldTypeBytes:        return "bytes";
    case FieldTypeFloat:        return "float";
    }
    return "unknown";
}

/* Free a field set and its contained fields. */
void fieldset_free(ProtoViewFieldSet *fs) {
    for (uint32_t j = 0; j < fs->numfields; j++)
        field_free(fs->fields[j]);
    free(fs->fields);
    free(fs);
}

/* Allocate and init an empty field set. */
ProtoViewFieldSet *fieldset_new(void) {
    ProtoViewFieldSet *fs = malloc(sizeof(*fs));
    fs->numfields = 0;
    fs->fields = NULL;
    return fs;
}

/* Append an already allocated field at the end of the specified field set. */
static void fieldset_add_field(ProtoViewFieldSet *fs, ProtoViewField *field) {
    fs->numfields++;
    fs->fields = realloc(fs->fields,sizeof(ProtoViewField*)*fs->numfields);
    fs->fields[fs->numfields-1] = field;
}

/* Allocate and append an integer field. */
void fieldset_add_int(ProtoViewFieldSet *fs, const char *name, int64_t val, uint8_t bits) {
    ProtoViewField *f = field_new(FieldTypeSignedInt,name);
    f->value = val;
    f->len = bits;
    fieldset_add_field(fs,f);
}

/* Allocate and append an unsigned field. */
void fieldset_add_uint(ProtoViewFieldSet *fs, const char *name, uint64_t uval, uint8_t bits) {
    ProtoViewField *f = field_new(FieldTypeUnsignedInt,name);
    f->uvalue = uval;
    f->len = bits;
    fieldset_add_field(fs,f);
}

/* Allocate and append a hex field. This is an unsigned number but
 * with an hex representation. */
void fieldset_add_hex(ProtoViewFieldSet *fs, const char *name, uint64_t uval, uint8_t bits) {
    ProtoViewField *f = field_new(FieldTypeHex,name);
    f->uvalue = uval;
    f->len = bits;
    fieldset_add_field(fs,f);
}

/* Allocate and append a bin field. This is an unsigned number but
 * with a binary representation. */
void fieldset_add_bin(ProtoViewFieldSet *fs, const char *name, uint64_t uval, uint8_t bits) {
    ProtoViewField *f = field_new(FieldTypeBinary,name);
    f->uvalue = uval;
    f->len = bits;
    fieldset_add_field(fs,f);
}

/* Allocate and append a string field. */
void fieldset_add_str(ProtoViewFieldSet *fs, const char *name, const char *s) {
    ProtoViewField *f = field_new(FieldTypeStr,name);
    f->str = strdup(s);
    f->len = strlen(s);
    fieldset_add_field(fs,f);
}

/* Allocate and append a bytes field. Note that 'count' is specified in
 * nibbles (bytes*2). */
void fieldset_add_bytes(ProtoViewFieldSet *fs, const char *name, const uint8_t *bytes, uint32_t count_nibbles) {
    uint32_t numbytes = (count_nibbles+count_nibbles%2)/2;
    ProtoViewField *f = field_new(FieldTypeBytes,name);
    f->bytes = malloc(numbytes);
    memcpy(f->bytes,bytes,numbytes);
    f->len = count_nibbles;
    fieldset_add_field(fs,f);
}

/* Allocate and append a float field. */
void fieldset_add_float(ProtoViewFieldSet *fs, const char *name, float val, uint32_t digits_after_dot) {
    ProtoViewField *f = field_new(FieldTypeFloat,name);
    f->fvalue = val;
    f->len = digits_after_dot;
    fieldset_add_field(fs,f);
}