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struct pdf_doc;
enum cos_type {
COS_TYPE_NULL,
COS_TYPE_BOOL,
COS_TYPE_INT,
COS_TYPE_REAL,
COS_TYPE_NAME,
COS_TYPE_STRING,
COS_TYPE_ARRAY,
COS_TYPE_DICTIONARY,
COS_TYPE_NAMETREE,
COS_TYPE_NUMBERTREE,
COS_TYPE_STREAM,
COS_TYPE_REFERENCE,
};
struct cos_object;
struct cos_dictionary_entry {
/** next key/value in dictionary */
struct cos_dictionary_entry *next;
/** key (name) */
struct cos_object *key;
/** value */
struct cos_object *value;
};
struct cos_array_entry {
/** next value in array */
struct cos_array_entry *next;
/** value */
struct cos_object *value;
};
struct cos_string {
uint8_t *data;
size_t length;
size_t alloc;
};
struct cos_reference {
/** id of indirect object */
uint64_t id;
/* generation of indirect object */
uint64_t generation;
};
struct cos_object {
int type;
union {
/** boolean */
bool b;
/** integer */
int64_t i;
/** real */
double r;
/** name */
char *n;
/** string */
struct cos_string *s;
/** stream data */
uint8_t *stream;
/* dictionary */
struct cos_dictionary_entry *dictionary;
/* array */
struct cos_array_entry *array;
/** reference */
struct cos_reference *reference;
} u;
};
/**
* Decode input stream into an object
*
* lex and parse a byte stream to generate a COS object.
*/
nspdferror cos_decode_object(struct pdf_doc *doc, uint64_t *offset_out, struct cos_object **cosobj_out);
nspdferror cos_free_object(struct cos_object *cos_obj);
/**
* extract a value for a key from a dictionary
*
* This retrieves the value of a given key in a dictionary and removes it from
* the dictionary.
*
* \param dict The dictionary
* \param key The key to lookup
* \param value_out The value object associated with the key
* \return NSPDFERROR_OK and value_out updated on success.
* NSPDFERROR_TYPE if the object passed in \p dict is not a dictionary.
* NSPDFERROR_NOTFOUND if the key is not present in the dictionary.
*/
nspdferror cos_extract_dictionary_value(struct cos_object *dict, const char *key, struct cos_object **value_out);
/**
* get a value for a key from a dictionary
*
* \param dict The dictionary
* \param key The key to lookup
* \param value_out The value object associated with the key
* \return NSPDFERROR_OK and value_out updated on success.
* NSPDFERROR_TYPE if the object passed in \p dict is not a dictionary.
* NSPDFERROR_NOTFOUND if the key is not present in the dictionary.
*/
nspdferror cos_get_dictionary_value(struct pdf_doc *doc, struct cos_object *dict, const char *key, struct cos_object **value_out);
nspdferror cos_get_dictionary_int(struct pdf_doc *doc, struct cos_object *dict, const char *key, int64_t *value_out);
nspdferror cos_get_dictionary_name(struct pdf_doc *doc, struct cos_object *dict, const char *key, const char **value_out);
nspdferror cos_get_dictionary_dictionary(struct pdf_doc *doc, struct cos_object *dict, const char *key, struct cos_object **value_out);
nspdferror cos_heritable_dictionary_dictionary(struct pdf_doc *doc, struct cos_object *dict, const char *key, struct cos_object **value_out);
nspdferror cos_get_dictionary_array(struct pdf_doc *doc, struct cos_object *dict, const char *key, struct cos_object **value_out);
nspdferror cos_heritable_dictionary_array(struct pdf_doc *doc, struct cos_object *dict, const char *key, struct cos_object **value_out);
nspdferror cos_get_int(struct pdf_doc *doc, struct cos_object *cobj, int64_t *value_out);
nspdferror cos_get_name(struct pdf_doc *doc, struct cos_object *cobj, const char **value_out);
nspdferror cos_get_dictionary(struct pdf_doc *doc, struct cos_object *cobj, struct cos_object **value_out);
nspdferror cos_get_array(struct pdf_doc *doc, struct cos_object *cobj, struct cos_object **value_out);
nspdferror cos_get_array_size(struct pdf_doc *doc, struct cos_object *cobj, unsigned int *size_out);
nspdferror cos_get_array_value(struct pdf_doc *doc, struct cos_object *array, unsigned int index, struct cos_object **value_out);
nspdferror cos_get_array_dictionary(struct pdf_doc *doc, struct cos_object *arrau, unsigned int index, struct cos_object **value_out);
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