27
28 #include "memory/allocation.hpp"
29 #include "utilities/bytes.hpp"
30 #include "utilities/exceptions.hpp"
31
32 // Input stream for reading .class file
33 //
34 // The entire input stream is present in a buffer allocated by the caller.
35 // The caller is responsible for deallocating the buffer and for using
36 // ResourceMarks appropriately when constructing streams.
37
38 class ClassPathEntry;
39
40 class ClassFileStream: public ResourceObj {
41 private:
42 const u1* const _buffer_start; // Buffer bottom
43 const u1* const _buffer_end; // Buffer top (one past last element)
44 mutable const u1* _current; // Current buffer position
45 const char* const _source; // Source of stream (directory name, ZIP/JAR archive name)
46 bool _need_verify; // True if verification is on for the class file
47
48 void truncated_file_error(TRAPS) const ;
49
50 protected:
51 const u1* clone_buffer() const;
52 const char* const clone_source() const;
53
54 public:
55 static const bool no_verification;
56 static const bool verify;
57
58 ClassFileStream(const u1* buffer,
59 int length,
60 const char* source,
61 bool verify_stream = verify); // to be verified by default
62
63 virtual const ClassFileStream* clone() const;
64
65 // Buffer access
66 const u1* buffer() const { return _buffer_start; }
67 int length() const { return _buffer_end - _buffer_start; }
68 const u1* current() const { return _current; }
69 void set_current(const u1* pos) const {
70 assert(pos >= _buffer_start && pos <= _buffer_end, "invariant");
71 _current = pos;
72 }
73
74 // for relative positioning
75 juint current_offset() const {
76 return (juint)(_current - _buffer_start);
77 }
78 const char* source() const { return _source; }
79 bool need_verify() const { return _need_verify; }
80 void set_verify(bool flag) { _need_verify = flag; }
81
82 void check_truncated_file(bool b, TRAPS) const {
83 if (b) {
84 truncated_file_error(THREAD);
85 }
86 }
87
88 void guarantee_more(int size, TRAPS) const {
89 size_t remaining = (size_t)(_buffer_end - _current);
90 unsigned int usize = (unsigned int)size;
91 check_truncated_file(usize > remaining, CHECK);
92 }
93
94 // Read u1 from stream
95 u1 get_u1(TRAPS) const;
96 u1 get_u1_fast() const {
97 return *_current++;
98 }
99
100 // Read u2 from stream
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27
28 #include "memory/allocation.hpp"
29 #include "utilities/bytes.hpp"
30 #include "utilities/exceptions.hpp"
31
32 // Input stream for reading .class file
33 //
34 // The entire input stream is present in a buffer allocated by the caller.
35 // The caller is responsible for deallocating the buffer and for using
36 // ResourceMarks appropriately when constructing streams.
37
38 class ClassPathEntry;
39
40 class ClassFileStream: public ResourceObj {
41 private:
42 const u1* const _buffer_start; // Buffer bottom
43 const u1* const _buffer_end; // Buffer top (one past last element)
44 mutable const u1* _current; // Current buffer position
45 const char* const _source; // Source of stream (directory name, ZIP/JAR archive name)
46 bool _need_verify; // True if verification is on for the class file
47 bool _from_modules_image; // True if this was created by ClassPathImageEntry.
48 void truncated_file_error(TRAPS) const ;
49
50 protected:
51 const u1* clone_buffer() const;
52 const char* const clone_source() const;
53
54 public:
55 static const bool no_verification;
56 static const bool verify;
57
58 ClassFileStream(const u1* buffer,
59 int length,
60 const char* source,
61 bool verify_stream = verify, // to be verified by default
62 bool from_modules_image = false);
63
64 virtual const ClassFileStream* clone() const;
65
66 // Buffer access
67 const u1* buffer() const { return _buffer_start; }
68 int length() const { return _buffer_end - _buffer_start; }
69 const u1* current() const { return _current; }
70 void set_current(const u1* pos) const {
71 assert(pos >= _buffer_start && pos <= _buffer_end, "invariant");
72 _current = pos;
73 }
74
75 // for relative positioning
76 juint current_offset() const {
77 return (juint)(_current - _buffer_start);
78 }
79 const char* source() const { return _source; }
80 bool need_verify() const { return _need_verify; }
81 void set_verify(bool flag) { _need_verify = flag; }
82 bool from_modules_image() const { return _from_modules_image; }
83
84 void check_truncated_file(bool b, TRAPS) const {
85 if (b) {
86 truncated_file_error(THREAD);
87 }
88 }
89
90 void guarantee_more(int size, TRAPS) const {
91 size_t remaining = (size_t)(_buffer_end - _current);
92 unsigned int usize = (unsigned int)size;
93 check_truncated_file(usize > remaining, CHECK);
94 }
95
96 // Read u1 from stream
97 u1 get_u1(TRAPS) const;
98 u1 get_u1_fast() const {
99 return *_current++;
100 }
101
102 // Read u2 from stream
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