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base64.c
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1 /*
2  * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * @brief Base64 encode/decode
24  * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
25  */
26 
27 #include "common.h"
28 #include "base64.h"
29 #include "intreadwrite.h"
30 #include "timer.h"
31 
32 /* ---------------- private code */
33 static const uint8_t map2[256] =
34 {
35  0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
36  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
37  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
38  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
39  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
40  0xff, 0xff, 0xff,
41 
42  0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
43  0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
44  0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
45  0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
46  0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
47  0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
48  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
49  0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
50  0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
51  0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
52 
53  0xff, 0xff, 0xff, 0xff, 0xff,
54  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
55  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
56  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
57  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
58  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
59  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
60  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
61  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
62  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
63  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
64  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
65  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
66  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
67  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
68  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
69  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
70 };
71 
72 #define BASE64_DEC_STEP(i) do { \
73  bits = map2[in[i]]; \
74  if (bits & 0x80) \
75  goto out ## i; \
76  v = i ? (v << 6) + bits : bits; \
77 } while(0)
78 
79 int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
80 {
81  uint8_t *dst = out;
82  uint8_t *end = out + out_size;
83  // no sign extension
84  const uint8_t *in = in_str;
85  unsigned bits = 0xff;
86  unsigned v;
87 
88  while (end - dst > 3) {
89  BASE64_DEC_STEP(0);
90  BASE64_DEC_STEP(1);
91  BASE64_DEC_STEP(2);
92  BASE64_DEC_STEP(3);
93  // Using AV_WB32 directly confuses compiler
94  v = av_be2ne32(v << 8);
95  AV_WN32(dst, v);
96  dst += 3;
97  in += 4;
98  }
99  if (end - dst) {
100  BASE64_DEC_STEP(0);
101  BASE64_DEC_STEP(1);
102  BASE64_DEC_STEP(2);
103  BASE64_DEC_STEP(3);
104  *dst++ = v >> 16;
105  if (end - dst)
106  *dst++ = v >> 8;
107  if (end - dst)
108  *dst++ = v;
109  in += 4;
110  }
111  while (1) {
112  BASE64_DEC_STEP(0);
113  in++;
114  BASE64_DEC_STEP(0);
115  in++;
116  BASE64_DEC_STEP(0);
117  in++;
118  BASE64_DEC_STEP(0);
119  in++;
120  }
121 
122 out3:
123  *dst++ = v >> 10;
124  v <<= 2;
125 out2:
126  *dst++ = v >> 4;
127 out1:
128 out0:
129  return bits & 1 ? AVERROR_INVALIDDATA : dst - out;
130 }
131 
132 /*****************************************************************************
133 * b64_encode: Stolen from VLC's http.c.
134 * Simplified by Michael.
135 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
136 *****************************************************************************/
137 
138 char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
139 {
140  static const char b64[] =
141  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
142  char *ret, *dst;
143  unsigned i_bits = 0;
144  int i_shift = 0;
145  int bytes_remaining = in_size;
146 
147  if (in_size >= UINT_MAX / 4 ||
148  out_size < AV_BASE64_SIZE(in_size))
149  return NULL;
150  ret = dst = out;
151  while (bytes_remaining > 3) {
152  i_bits = AV_RB32(in);
153  in += 3; bytes_remaining -= 3;
154  *dst++ = b64[ i_bits>>26 ];
155  *dst++ = b64[(i_bits>>20) & 0x3F];
156  *dst++ = b64[(i_bits>>14) & 0x3F];
157  *dst++ = b64[(i_bits>>8 ) & 0x3F];
158  }
159  i_bits = 0;
160  while (bytes_remaining) {
161  i_bits = (i_bits << 8) + *in++;
162  bytes_remaining--;
163  i_shift += 8;
164  }
165  while (i_shift > 0) {
166  *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
167  i_shift -= 6;
168  }
169  while ((dst - ret) & 3)
170  *dst++ = '=';
171  *dst = '\0';
172 
173  return ret;
174 }
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define av_be2ne32(x)
Definition: bswap.h:93
uint8_t bits
Definition: crc.c:296
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static const uint8_t map2[256]
Definition: base64.c:33
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
high precision timer, useful to profile code
#define BASE64_DEC_STEP(i)
Definition: base64.c:72
int out_size
Definition: movenc-test.c:55
char * av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
Encode data to base64 and null-terminate.
Definition: base64.c:138
#define AV_BASE64_SIZE(x)
Calculate the output size needed to base64-encode x bytes to a null-terminated string.
Definition: base64.h:66
FILE * out
Definition: movenc-test.c:54
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
common internal and external API header
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
Decode a base64-encoded string.
Definition: base64.c:79