1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17 #include "common.h"
18 #include "buffer.c"
19
20 int
_check_buf(PerlIO * infile,Buffer * buf,int min_wanted,int max_wanted)21 _check_buf(PerlIO *infile, Buffer *buf, int min_wanted, int max_wanted)
22 {
23 int ret = 1;
24
25 // Do we have enough data?
26 if ( buffer_len(buf) < min_wanted ) {
27 // Read more data
28 uint32_t read;
29 uint32_t actual_wanted;
30 unsigned char *tmp;
31
32 #ifdef _MSC_VER
33 uint32_t pos_check = PerlIO_tell(infile);
34 #endif
35
36 if (min_wanted > max_wanted) {
37 max_wanted = min_wanted;
38 }
39
40 // Adjust actual amount to read by the amount we already have in the buffer
41 actual_wanted = max_wanted - buffer_len(buf);
42
43 New(0, tmp, actual_wanted, unsigned char);
44
45 DEBUG_TRACE("Buffering from file @ %d (min_wanted %d, max_wanted %d, adjusted to %d)\n",
46 (int)PerlIO_tell(infile), min_wanted, max_wanted, actual_wanted
47 );
48
49 if ( (read = PerlIO_read(infile, tmp, actual_wanted)) <= 0 ) {
50 if ( PerlIO_error(infile) ) {
51 warn("Error reading: %s (wanted %d)\n", strerror(errno), actual_wanted);
52 }
53 else {
54 // Avoid printing this warning, let image format routines handle warnings and errors
55 //warn("Error: Unable to read at least %d bytes from file.\n", min_wanted);
56 }
57
58 ret = 0;
59 goto out;
60 }
61
62 buffer_append(buf, tmp, read);
63
64 // Make sure we got enough
65 if ( buffer_len(buf) < min_wanted ) {
66 warn("Error: Unable to read at least %d bytes from file (only read %d).\n", min_wanted, read);
67 ret = 0;
68 goto out;
69 }
70
71 #ifdef _MSC_VER
72 // Bug 16095, weird off-by-one bug seen only on Win32 and only when reading a filehandle
73 if (PerlIO_tell(infile) != pos_check + read) {
74 //PerlIO_printf(PerlIO_stderr(), "Win32 bug, pos should be %d, but was %d\n", pos_check + read, PerlIO_tell(infile));
75 PerlIO_seek(infile, pos_check + read, SEEK_SET);
76 }
77 #endif
78
79 DEBUG_TRACE("Buffered %d bytes, new pos %d\n", read, (int)PerlIO_tell(infile));
80
81 out:
82 Safefree(tmp);
83 }
84
85 return ret;
86 }
87
88 off_t
_file_size(PerlIO * infile)89 _file_size(PerlIO *infile)
90 {
91 #ifdef _MSC_VER
92 // Win32 doesn't work right with fstat
93 off_t file_size;
94
95 PerlIO_seek(infile, 0, SEEK_END);
96 file_size = PerlIO_tell(infile);
97 PerlIO_seek(infile, 0, SEEK_SET);
98
99 return file_size;
100 #else
101 struct stat buf;
102
103 if ( !fstat( PerlIO_fileno(infile), &buf ) ) {
104 return buf.st_size;
105 }
106
107 warn("Unable to stat: %s\n", strerror(errno));
108
109 return 0;
110 #endif
111 }
112
113 #ifdef AUDIO_SCAN_DEBUG
114 void
hexdump(unsigned char * data,uint32_t size)115 hexdump(unsigned char *data, uint32_t size)
116 {
117 unsigned char c;
118 int i = 1;
119 int n;
120 char bytestr[4] = {0};
121 char hexstr[ 16*3 + 5] = {0};
122 char charstr[16*1 + 5] = {0};
123
124 if (!size) {
125 return;
126 }
127
128 for (n = 0; n < size; n++) {
129 c = data[n];
130
131 /* store hex str (for left side) */
132 snprintf(bytestr, sizeof(bytestr), "%02x ", c);
133 strncat(hexstr, bytestr, sizeof(hexstr)-strlen(hexstr)-1);
134
135 /* store char str (for right side) */
136 if (c < 21 || c > 0x7E) {
137 c = '.';
138 }
139 snprintf(bytestr, sizeof(bytestr), "%c", c);
140 strncat(charstr, bytestr, sizeof(charstr)-strlen(charstr)-1);
141
142 if (i % 16 == 0) {
143 /* line completed */
144 PerlIO_printf(PerlIO_stderr(), "%-50.50s %s\n", hexstr, charstr);
145 hexstr[0] = 0;
146 charstr[0] = 0;
147 }
148 i++;
149 }
150
151 if (strlen(hexstr) > 0) {
152 /* print rest of buffer if not empty */
153 PerlIO_printf(PerlIO_stderr(), "%-50.50s %s\n", hexstr, charstr);
154 }
155 }
156 #endif
157