803 lines
13 KiB
C
803 lines
13 KiB
C
#include "fitz.h"
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typedef enum fz_objkind_e
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{
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FZ_NULL,
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FZ_BOOL,
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FZ_INT,
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FZ_REAL,
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FZ_STRING,
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FZ_NAME,
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FZ_ARRAY,
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FZ_DICT,
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FZ_INDIRECT
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} fz_objkind;
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struct keyval
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{
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fz_obj *k;
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fz_obj *v;
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};
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struct fz_obj_s
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{
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int refs;
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fz_objkind kind;
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union
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{
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int b;
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int i;
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float f;
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struct {
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unsigned short len;
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char buf[1];
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} s;
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char n[1];
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struct {
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int len;
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int cap;
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fz_obj **items;
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} a;
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struct {
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char sorted;
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int len;
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int cap;
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struct keyval *items;
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} d;
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struct {
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int num;
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int gen;
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struct pdf_xref_s *xref;
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} r;
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} u;
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};
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static fz_obj *fz_resolve_indirect_null(fz_obj *ref)
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{
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return ref;
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}
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fz_obj* (*fz_resolve_indirect)(fz_obj*) = fz_resolve_indirect_null;
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fz_obj *
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fz_new_null(void)
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{
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fz_obj *obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_NULL;
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return obj;
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}
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fz_obj *
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fz_new_bool(int b)
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{
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fz_obj *obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_BOOL;
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obj->u.b = b;
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return obj;
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}
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fz_obj *
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fz_new_int(int i)
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{
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fz_obj *obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_INT;
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obj->u.i = i;
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return obj;
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}
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fz_obj *
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fz_new_real(float f)
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{
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fz_obj *obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_REAL;
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obj->u.f = f;
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return obj;
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}
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fz_obj *
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fz_new_string(char *str, int len)
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{
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fz_obj *obj = fz_malloc(offsetof(fz_obj, u.s.buf) + len + 1);
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obj->refs = 1;
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obj->kind = FZ_STRING;
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obj->u.s.len = len;
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memcpy(obj->u.s.buf, str, len);
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obj->u.s.buf[len] = '\0';
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return obj;
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}
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fz_obj *
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fz_new_name(char *str)
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{
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fz_obj *obj = fz_malloc(offsetof(fz_obj, u.n) + strlen(str) + 1);
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obj->refs = 1;
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obj->kind = FZ_NAME;
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strcpy(obj->u.n, str);
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return obj;
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}
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fz_obj *
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fz_new_indirect(int num, int gen, void *xref)
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{
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fz_obj *obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_INDIRECT;
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obj->u.r.num = num;
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obj->u.r.gen = gen;
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obj->u.r.xref = xref;
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return obj;
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}
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fz_obj *
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fz_keep_obj(fz_obj *obj)
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{
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assert(obj != NULL);
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obj->refs ++;
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return obj;
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}
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int fz_is_indirect(fz_obj *obj)
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{
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return obj ? obj->kind == FZ_INDIRECT : 0;
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}
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int fz_is_null(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_NULL : 0;
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}
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int fz_is_bool(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_BOOL : 0;
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}
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int fz_is_int(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_INT : 0;
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}
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int fz_is_real(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_REAL : 0;
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}
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int fz_is_string(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_STRING : 0;
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}
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int fz_is_name(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_NAME : 0;
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}
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int fz_is_array(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_ARRAY : 0;
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}
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int fz_is_dict(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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return obj ? obj->kind == FZ_DICT : 0;
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}
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int fz_to_bool(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_bool(obj))
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return obj->u.b;
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return 0;
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}
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int fz_to_int(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_int(obj))
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return obj->u.i;
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if (fz_is_real(obj))
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return obj->u.f;
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return 0;
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}
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float fz_to_real(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_real(obj))
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return obj->u.f;
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if (fz_is_int(obj))
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return obj->u.i;
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return 0;
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}
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char *fz_to_name(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_name(obj))
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return obj->u.n;
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return "";
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}
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char *fz_to_str_buf(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_string(obj))
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return obj->u.s.buf;
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return "";
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}
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int fz_to_str_len(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_string(obj))
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return obj->u.s.len;
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return 0;
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}
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/* for use by pdf_crypt_obj_imp to decrypt AES string in place */
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void fz_set_str_len(fz_obj *obj, int newlen)
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{
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obj = fz_resolve_indirect(obj);
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if (fz_is_string(obj))
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if (newlen < obj->u.s.len)
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obj->u.s.len = newlen;
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}
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int fz_to_num(fz_obj *obj)
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{
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if (fz_is_indirect(obj))
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return obj->u.r.num;
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return 0;
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}
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int fz_to_gen(fz_obj *obj)
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{
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if (fz_is_indirect(obj))
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return obj->u.r.gen;
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return 0;
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}
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void *fz_get_indirect_xref(fz_obj *obj)
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{
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if (fz_is_indirect(obj))
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return obj->u.r.xref;
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return NULL;
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}
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int
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fz_objcmp(fz_obj *a, fz_obj *b)
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{
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int i;
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if (a == b)
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return 0;
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if (!a || !b)
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return 1;
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if (a->kind != b->kind)
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return 1;
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switch (a->kind)
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{
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case FZ_NULL:
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return 0;
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case FZ_BOOL:
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return a->u.b - b->u.b;
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case FZ_INT:
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return a->u.i - b->u.i;
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case FZ_REAL:
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if (a->u.f < b->u.f)
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return -1;
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if (a->u.f > b->u.f)
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return 1;
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return 0;
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case FZ_STRING:
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if (a->u.s.len < b->u.s.len)
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{
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if (memcmp(a->u.s.buf, b->u.s.buf, a->u.s.len) <= 0)
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return -1;
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return 1;
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}
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if (a->u.s.len > b->u.s.len)
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{
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if (memcmp(a->u.s.buf, b->u.s.buf, b->u.s.len) >= 0)
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return 1;
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return -1;
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}
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return memcmp(a->u.s.buf, b->u.s.buf, a->u.s.len);
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case FZ_NAME:
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return strcmp(a->u.n, b->u.n);
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case FZ_INDIRECT:
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if (a->u.r.num == b->u.r.num)
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return a->u.r.gen - b->u.r.gen;
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return a->u.r.num - b->u.r.num;
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case FZ_ARRAY:
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if (a->u.a.len != b->u.a.len)
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return a->u.a.len - b->u.a.len;
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for (i = 0; i < a->u.a.len; i++)
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if (fz_objcmp(a->u.a.items[i], b->u.a.items[i]))
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return 1;
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return 0;
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case FZ_DICT:
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if (a->u.d.len != b->u.d.len)
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return a->u.d.len - b->u.d.len;
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for (i = 0; i < a->u.d.len; i++)
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{
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if (fz_objcmp(a->u.d.items[i].k, b->u.d.items[i].k))
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return 1;
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if (fz_objcmp(a->u.d.items[i].v, b->u.d.items[i].v))
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return 1;
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}
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return 0;
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}
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return 1;
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}
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static char *
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fz_objkindstr(fz_obj *obj)
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{
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if (obj == NULL)
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return "<NULL>";
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switch (obj->kind)
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{
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case FZ_NULL: return "null";
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case FZ_BOOL: return "boolean";
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case FZ_INT: return "integer";
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case FZ_REAL: return "real";
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case FZ_STRING: return "string";
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case FZ_NAME: return "name";
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case FZ_ARRAY: return "array";
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case FZ_DICT: return "dictionary";
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case FZ_INDIRECT: return "reference";
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}
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return "<unknown>";
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}
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fz_obj *
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fz_new_array(int initialcap)
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{
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fz_obj *obj;
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int i;
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obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_ARRAY;
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obj->u.a.len = 0;
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obj->u.a.cap = initialcap > 1 ? initialcap : 6;
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obj->u.a.items = fz_calloc(obj->u.a.cap, sizeof(fz_obj*));
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for (i = 0; i < obj->u.a.cap; i++)
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obj->u.a.items[i] = NULL;
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return obj;
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}
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fz_obj *
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fz_copy_array(fz_obj *obj)
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{
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fz_obj *new;
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int i;
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if (fz_is_indirect(obj) || !fz_is_array(obj))
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fz_warn("assert: not an array (%s)", fz_objkindstr(obj));
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new = fz_new_array(fz_array_len(obj));
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for (i = 0; i < fz_array_len(obj); i++)
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fz_array_push(new, fz_array_get(obj, i));
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return new;
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}
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int
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fz_array_len(fz_obj *obj)
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{
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obj = fz_resolve_indirect(obj);
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if (!fz_is_array(obj))
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return 0;
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return obj->u.a.len;
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}
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fz_obj *
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fz_array_get(fz_obj *obj, int i)
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{
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obj = fz_resolve_indirect(obj);
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if (!fz_is_array(obj))
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return NULL;
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if (i < 0 || i >= obj->u.a.len)
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return NULL;
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return obj->u.a.items[i];
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}
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void
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fz_array_put(fz_obj *obj, int i, fz_obj *item)
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{
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obj = fz_resolve_indirect(obj);
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if (!fz_is_array(obj))
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fz_warn("assert: not an array (%s)", fz_objkindstr(obj));
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else if (i < 0)
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fz_warn("assert: index %d < 0", i);
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else if (i >= obj->u.a.len)
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fz_warn("assert: index %d > length %d", i, obj->u.a.len);
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else
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{
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if (obj->u.a.items[i])
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fz_drop_obj(obj->u.a.items[i]);
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obj->u.a.items[i] = fz_keep_obj(item);
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}
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}
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void
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fz_array_push(fz_obj *obj, fz_obj *item)
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{
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obj = fz_resolve_indirect(obj);
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if (!fz_is_array(obj))
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fz_warn("assert: not an array (%s)", fz_objkindstr(obj));
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else
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{
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if (obj->u.a.len + 1 > obj->u.a.cap)
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{
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int i;
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obj->u.a.cap = (obj->u.a.cap * 3) / 2;
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obj->u.a.items = fz_realloc(obj->u.a.items, obj->u.a.cap, sizeof(fz_obj*));
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for (i = obj->u.a.len ; i < obj->u.a.cap; i++)
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obj->u.a.items[i] = NULL;
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}
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obj->u.a.items[obj->u.a.len] = fz_keep_obj(item);
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obj->u.a.len++;
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}
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}
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void
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fz_array_insert(fz_obj *obj, fz_obj *item)
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{
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obj = fz_resolve_indirect(obj);
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if (!fz_is_array(obj))
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fz_warn("assert: not an array (%s)", fz_objkindstr(obj));
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else
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{
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if (obj->u.a.len + 1 > obj->u.a.cap)
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{
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int i;
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obj->u.a.cap = (obj->u.a.cap * 3) / 2;
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obj->u.a.items = fz_realloc(obj->u.a.items, obj->u.a.cap, sizeof(fz_obj*));
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for (i = obj->u.a.len ; i < obj->u.a.cap; i++)
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obj->u.a.items[i] = NULL;
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}
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memmove(obj->u.a.items + 1, obj->u.a.items, obj->u.a.len * sizeof(fz_obj*));
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obj->u.a.items[0] = fz_keep_obj(item);
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obj->u.a.len++;
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}
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}
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/* dicts may only have names as keys! */
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static int keyvalcmp(const void *ap, const void *bp)
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{
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const struct keyval *a = ap;
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const struct keyval *b = bp;
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return strcmp(fz_to_name(a->k), fz_to_name(b->k));
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}
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fz_obj *
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fz_new_dict(int initialcap)
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{
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fz_obj *obj;
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int i;
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obj = fz_malloc(sizeof(fz_obj));
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obj->refs = 1;
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obj->kind = FZ_DICT;
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obj->u.d.sorted = 1;
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obj->u.d.len = 0;
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obj->u.d.cap = initialcap > 1 ? initialcap : 10;
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obj->u.d.items = fz_calloc(obj->u.d.cap, sizeof(struct keyval));
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for (i = 0; i < obj->u.d.cap; i++)
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{
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obj->u.d.items[i].k = NULL;
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obj->u.d.items[i].v = NULL;
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}
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return obj;
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}
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fz_obj *
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fz_copy_dict(fz_obj *obj)
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{
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fz_obj *new;
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int i;
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if (fz_is_indirect(obj) || !fz_is_dict(obj))
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fz_throw("assert: not a dict (%s)", fz_objkindstr(obj));
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new = fz_new_dict(fz_dict_len(obj));
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for (i = 0; i < fz_dict_len(obj); i++)
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fz_dict_put(new, fz_dict_get_key(obj, i), fz_dict_get_val(obj, i));
|
|
|
|
return new;
|
|
}
|
|
|
|
int
|
|
fz_dict_len(fz_obj *obj)
|
|
{
|
|
obj = fz_resolve_indirect(obj);
|
|
if (!fz_is_dict(obj))
|
|
return 0;
|
|
return obj->u.d.len;
|
|
}
|
|
|
|
fz_obj *
|
|
fz_dict_get_key(fz_obj *obj, int i)
|
|
{
|
|
obj = fz_resolve_indirect(obj);
|
|
|
|
if (!fz_is_dict(obj))
|
|
return NULL;
|
|
|
|
if (i < 0 || i >= obj->u.d.len)
|
|
return NULL;
|
|
|
|
return obj->u.d.items[i].k;
|
|
}
|
|
|
|
fz_obj *
|
|
fz_dict_get_val(fz_obj *obj, int i)
|
|
{
|
|
obj = fz_resolve_indirect(obj);
|
|
|
|
if (!fz_is_dict(obj))
|
|
return NULL;
|
|
|
|
if (i < 0 || i >= obj->u.d.len)
|
|
return NULL;
|
|
|
|
return obj->u.d.items[i].v;
|
|
}
|
|
|
|
static int
|
|
fz_dict_finds(fz_obj *obj, char *key)
|
|
{
|
|
if (obj->u.d.sorted)
|
|
{
|
|
int l = 0;
|
|
int r = obj->u.d.len - 1;
|
|
while (l <= r)
|
|
{
|
|
int m = (l + r) >> 1;
|
|
int c = -strcmp(fz_to_name(obj->u.d.items[m].k), key);
|
|
if (c < 0)
|
|
r = m - 1;
|
|
else if (c > 0)
|
|
l = m + 1;
|
|
else
|
|
return m;
|
|
}
|
|
}
|
|
|
|
else
|
|
{
|
|
int i;
|
|
for (i = 0; i < obj->u.d.len; i++)
|
|
if (strcmp(fz_to_name(obj->u.d.items[i].k), key) == 0)
|
|
return i;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
fz_obj *
|
|
fz_dict_gets(fz_obj *obj, char *key)
|
|
{
|
|
int i;
|
|
|
|
obj = fz_resolve_indirect(obj);
|
|
|
|
if (!fz_is_dict(obj))
|
|
return NULL;
|
|
|
|
i = fz_dict_finds(obj, key);
|
|
if (i >= 0)
|
|
return obj->u.d.items[i].v;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
fz_obj *
|
|
fz_dict_get(fz_obj *obj, fz_obj *key)
|
|
{
|
|
if (fz_is_name(key))
|
|
return fz_dict_gets(obj, fz_to_name(key));
|
|
return NULL;
|
|
}
|
|
|
|
fz_obj *
|
|
fz_dict_getsa(fz_obj *obj, char *key, char *abbrev)
|
|
{
|
|
fz_obj *v;
|
|
v = fz_dict_gets(obj, key);
|
|
if (v)
|
|
return v;
|
|
return fz_dict_gets(obj, abbrev);
|
|
}
|
|
|
|
void
|
|
fz_dict_put(fz_obj *obj, fz_obj *key, fz_obj *val)
|
|
{
|
|
char *s;
|
|
int i;
|
|
|
|
obj = fz_resolve_indirect(obj);
|
|
|
|
if (!fz_is_dict(obj))
|
|
{
|
|
fz_warn("assert: not a dict (%s)", fz_objkindstr(obj));
|
|
return;
|
|
}
|
|
|
|
if (fz_is_name(key))
|
|
s = fz_to_name(key);
|
|
else
|
|
{
|
|
fz_warn("assert: key is not a name (%s)", fz_objkindstr(obj));
|
|
return;
|
|
}
|
|
|
|
if (!val)
|
|
{
|
|
fz_warn("assert: val does not exist for key (%s)", s);
|
|
return;
|
|
}
|
|
|
|
i = fz_dict_finds(obj, s);
|
|
if (i >= 0)
|
|
{
|
|
fz_drop_obj(obj->u.d.items[i].v);
|
|
obj->u.d.items[i].v = fz_keep_obj(val);
|
|
return;
|
|
}
|
|
|
|
if (obj->u.d.len + 1 > obj->u.d.cap)
|
|
{
|
|
obj->u.d.cap = (obj->u.d.cap * 3) / 2;
|
|
obj->u.d.items = fz_realloc(obj->u.d.items, obj->u.d.cap, sizeof(struct keyval));
|
|
for (i = obj->u.d.len; i < obj->u.d.cap; i++)
|
|
{
|
|
obj->u.d.items[i].k = NULL;
|
|
obj->u.d.items[i].v = NULL;
|
|
}
|
|
}
|
|
|
|
/* borked! */
|
|
if (obj->u.d.len)
|
|
if (strcmp(fz_to_name(obj->u.d.items[obj->u.d.len - 1].k), s) > 0)
|
|
obj->u.d.sorted = 0;
|
|
|
|
obj->u.d.items[obj->u.d.len].k = fz_keep_obj(key);
|
|
obj->u.d.items[obj->u.d.len].v = fz_keep_obj(val);
|
|
obj->u.d.len ++;
|
|
}
|
|
|
|
void
|
|
fz_dict_puts(fz_obj *obj, char *key, fz_obj *val)
|
|
{
|
|
fz_obj *keyobj = fz_new_name(key);
|
|
fz_dict_put(obj, keyobj, val);
|
|
fz_drop_obj(keyobj);
|
|
}
|
|
|
|
void
|
|
fz_dict_dels(fz_obj *obj, char *key)
|
|
{
|
|
obj = fz_resolve_indirect(obj);
|
|
|
|
if (!fz_is_dict(obj))
|
|
fz_warn("assert: not a dict (%s)", fz_objkindstr(obj));
|
|
else
|
|
{
|
|
int i = fz_dict_finds(obj, key);
|
|
if (i >= 0)
|
|
{
|
|
fz_drop_obj(obj->u.d.items[i].k);
|
|
fz_drop_obj(obj->u.d.items[i].v);
|
|
obj->u.d.sorted = 0;
|
|
obj->u.d.items[i] = obj->u.d.items[obj->u.d.len-1];
|
|
obj->u.d.len --;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
fz_dict_del(fz_obj *obj, fz_obj *key)
|
|
{
|
|
if (fz_is_name(key))
|
|
fz_dict_dels(obj, fz_to_name(key));
|
|
else
|
|
fz_warn("assert: key is not a name (%s)", fz_objkindstr(obj));
|
|
}
|
|
|
|
void
|
|
fz_sort_dict(fz_obj *obj)
|
|
{
|
|
obj = fz_resolve_indirect(obj);
|
|
if (!fz_is_dict(obj))
|
|
return;
|
|
if (!obj->u.d.sorted)
|
|
{
|
|
qsort(obj->u.d.items, obj->u.d.len, sizeof(struct keyval), keyvalcmp);
|
|
obj->u.d.sorted = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
fz_free_array(fz_obj *obj)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < obj->u.a.len; i++)
|
|
if (obj->u.a.items[i])
|
|
fz_drop_obj(obj->u.a.items[i]);
|
|
|
|
fz_free(obj->u.a.items);
|
|
fz_free(obj);
|
|
}
|
|
|
|
static void
|
|
fz_free_dict(fz_obj *obj)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < obj->u.d.len; i++) {
|
|
if (obj->u.d.items[i].k)
|
|
fz_drop_obj(obj->u.d.items[i].k);
|
|
if (obj->u.d.items[i].v)
|
|
fz_drop_obj(obj->u.d.items[i].v);
|
|
}
|
|
|
|
fz_free(obj->u.d.items);
|
|
fz_free(obj);
|
|
}
|
|
|
|
void
|
|
fz_drop_obj(fz_obj *obj)
|
|
{
|
|
assert(obj != NULL);
|
|
if (--obj->refs == 0)
|
|
{
|
|
if (obj->kind == FZ_ARRAY)
|
|
fz_free_array(obj);
|
|
else if (obj->kind == FZ_DICT)
|
|
fz_free_dict(obj);
|
|
else
|
|
fz_free(obj);
|
|
}
|
|
}
|