nostrdb: pull latest, adding flatcc and lmdb
This commit is contained in:
William Casarin
448
nostrdb/flatcc/portable/pbase64.h
Normal file
448
nostrdb/flatcc/portable/pbase64.h
Normal file
@@ -0,0 +1,448 @@
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#ifndef PBASE64_H
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#define PBASE64_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdlib.h>
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/* Guarded to allow inclusion of pstdint.h first, if stdint.h is not supported. */
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#ifndef UINT8_MAX
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#include <stdint.h>
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#endif
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#define BASE64_EOK 0
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/* 0 or mure full blocks decoded, remaining content may be parsed with fresh buffer. */
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#define BASE64_EMORE 1
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/* The `src_len` argument is required when encoding. */
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#define BASE64_EARGS 2
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/* Unsupported mode, or modifier not supported by mode when encoding. */
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#define BASE64_EMODE 3
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/* Decoding ends at invalid tail length - either by source length or by non-alphabet symbol. */
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#define BASE64_ETAIL 4
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/* Decoding ends at valid tail length but last byte has non-zero bits where it shouldn't have. */
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#define BASE64_EDIRTY 5
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static inline const char *base64_strerror(int err);
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/* All codecs are URL safe. Only Crockford allow for non-canocical decoding. */
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enum {
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/* Most common base64 codec, but not url friendly. */
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base64_mode_rfc4648 = 0,
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/* URL safe version, '+' -> '-', '/' -> '_'. */
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base64_mode_url = 1,
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/*
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* Skip ' ', '\r', and '\n' - we do not allow tab because common
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* uses of base64 such as PEM do not allow tab.
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*/
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base64_dec_modifier_skipspace = 32,
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/* Padding is excluded by default. Not allowed for zbase64. */
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base64_enc_modifier_padding = 128,
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/* For internal use or to decide codec of mode. */
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base64_modifier_mask = 32 + 64 + 128,
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};
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/* Encoded size with or without padding. */
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static inline size_t base64_encoded_size(size_t len, int mode);
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/*
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* Decoded size assuming no padding.
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* If `len` does include padding, the actual size may be less
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* when decoding, but never more.
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*/
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static inline size_t base64_decoded_size(size_t len);
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/*
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* `dst` must hold ceil(len * 4 / 3) bytes.
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* `src_len` points to length of source and is updated with length of
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* parse on both success and failure. If `dst_len` is not null
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* it is used to store resulting output lengt withh length of decoded
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* output on both success and failure.
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* If `hyphen` is non-zero a hyphen is encoded every `hyphen` output bytes.
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* `mode` selects encoding alphabet defaulting to Crockfords base64.
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* Returns 0 on success.
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*
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* A terminal space can be added with `dst[dst_len++] = ' '` after the
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* encode call. All non-alphabet can be used as terminators except the
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* padding character '='. The following characters will work as
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* terminator for all modes: { '\0', '\n', ' ', '\t' }. A terminator is
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* optional when the source length is given to the decoder. Note that
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* crockford also reserves a few extra characters for checksum but the
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* checksum must be separate from the main buffer and is not supported
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* by this library.
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*/
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static inline int base64_encode(uint8_t *dst, const uint8_t *src, size_t *dst_len, size_t *src_len, int mode);
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/*
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* Decodes according to mode while ignoring encoding modifiers.
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* `src_len` and `dst_len` are optional pointers. If `src_len` is set it
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* must contain the length of the input, otherwise the input must be
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* terminated with a non-alphabet character or valid padding (a single
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* padding character is accepted) - if the src_len output is needed but
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* not the input due to guaranteed termination, then set it to
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* (size_t)-1. `dst_len` must contain length of output buffer if present
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* and parse will fail with BASE64_EMORE after decoding a block multiple
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* if dst_len is exhausted - the parse can thus be resumed after
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* draining destination. `src_len` and `dst_len` are updated with parsed
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* and decoded length, when present, on both success and failure.
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* Returns 0 on success. Invalid characters are not considered errors -
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* they simply terminate the parse, however, if the termination is not
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* at a block multiple or a valid partial block length then BASE64_ETAIL
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* without output holding the last full block, if any. BASE64_ETAIL is also
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* returned if the a valid length holds non-zero unused tail bits.
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*/
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static inline int base64_decode(uint8_t *dst, const uint8_t *src, size_t *dst_len, size_t *src_len, int mode);
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static inline const char *base64_strerror(int err)
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{
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switch (err) {
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case BASE64_EOK: return "ok";
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case BASE64_EARGS: return "invalid argument";
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case BASE64_EMODE: return "invalid mode";
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case BASE64_EMORE: return "destination full";
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case BASE64_ETAIL: return "invalid tail length";
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case BASE64_EDIRTY: return "invalid tail content";
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default: return "unknown error";
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}
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}
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static inline size_t base64_encoded_size(size_t len, int mode)
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{
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size_t k = len % 3;
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size_t n = (len * 4 / 3 + 3) & ~(size_t)3;
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int pad = mode & base64_enc_modifier_padding;
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if (!pad) {
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switch (k) {
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case 2:
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n -= 1;
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break;
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case 1:
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n -= 2;
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break;
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default:
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break;
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}
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}
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return n;
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}
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static inline size_t base64_decoded_size(size_t len)
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{
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size_t k = len % 4;
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size_t n = len / 4 * 3;
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switch (k) {
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case 3:
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return n + 2;
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case 2:
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return n + 1;
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case 1: /* Not valid without padding. */
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case 0:
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default:
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return n;
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}
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}
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static inline int base64_encode(uint8_t *dst, const uint8_t *src, size_t *dst_len, size_t *src_len, int mode)
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{
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const uint8_t *rfc4648_alphabet = (const uint8_t *)
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const uint8_t *url_alphabet = (const uint8_t *)
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
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const uint8_t *T;
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uint8_t *dst_base = dst;
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int pad = mode & base64_enc_modifier_padding;
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size_t len = 0;
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int ret = BASE64_EMODE;
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if (!src_len) {
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ret = BASE64_EARGS;
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goto done;
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}
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len = *src_len;
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mode = mode & ~base64_modifier_mask;
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switch (mode) {
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case base64_mode_rfc4648:
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T = rfc4648_alphabet;
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break;
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case base64_mode_url:
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T = url_alphabet;
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break;
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default:
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/* Invalid mode. */
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goto done;
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}
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ret = BASE64_EOK;
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/* Encodes 4 destination bytes from 3 source bytes. */
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while (len >= 3) {
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dst[0] = T[((src[0] >> 2))];
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dst[1] = T[((src[0] << 4) & 0x30) | (src[1] >> 4)];
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dst[2] = T[((src[1] << 2) & 0x3c) | (src[2] >> 6)];
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dst[3] = T[((src[2] & 0x3f))];
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len -= 3;
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dst += 4;
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src += 3;
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}
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/* Encodes 8 destination bytes from 1 to 4 source bytes, if any. */
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switch(len) {
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case 2:
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dst[0] = T[((src[0] >> 2))];
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dst[1] = T[((src[0] << 4) & 0x30) | (src[1] >> 4)];
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dst[2] = T[((src[1] << 2) & 0x3c)];
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dst += 3;
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if (pad) {
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*dst++ = '=';
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}
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break;
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case 1:
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dst[0] = T[((src[0] >> 2))];
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dst[1] = T[((src[0] << 4) & 0x30)];
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dst += 2;
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if (pad) {
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*dst++ = '=';
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*dst++ = '=';
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}
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break;
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default:
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pad = 0;
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break;
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}
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len = 0;
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done:
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if (dst_len) {
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*dst_len = (size_t)(dst - dst_base);
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}
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if (src_len) {
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*src_len -= len;
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}
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return ret;
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}
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static inline int base64_decode(uint8_t *dst, const uint8_t *src, size_t *dst_len, size_t *src_len, int mode)
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{
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static const uint8_t cinvalid = 64;
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static const uint8_t cignore = 65;
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static const uint8_t cpadding = 66;
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/*
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* 0..63: 6-bit encoded value.
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* 64: flags non-alphabet symbols.
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* 65: codes for ignored symbols.
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* 66: codes for pad symbol '='.
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* All codecs consider padding an optional terminator and if present
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* consumes as many pad bytes as possible up to block termination,
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* but does not fail if a block is not full.
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*
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* We do not currently have any ignored characters but we might
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* add spaces as per MIME spec, but assuming spaces only happen
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* at block boundaries this is probalby better handled by repeated
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* parsing.
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*/
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static const uint8_t base64rfc4648_decode[256] = {
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||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
|
||||
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 66, 64, 64,
|
||||
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
||||
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
|
||||
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
||||
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
|
||||
};
|
||||
|
||||
static const uint8_t base64url_decode[256] = {
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64,
|
||||
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 66, 64, 64,
|
||||
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
||||
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 63,
|
||||
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
||||
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
|
||||
};
|
||||
|
||||
static const uint8_t base64rfc4648_decode_skipspace[256] = {
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 65, 64, 64, 65, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
65, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
|
||||
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 66, 64, 64,
|
||||
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
||||
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
|
||||
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
||||
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
|
||||
};
|
||||
|
||||
static const uint8_t base64url_decode_skipspace[256] = {
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 65, 64, 64, 65, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
65, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64,
|
||||
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 66, 64, 64,
|
||||
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
||||
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 63,
|
||||
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
||||
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
||||
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
|
||||
};
|
||||
|
||||
int ret = BASE64_EOK;
|
||||
size_t i, k;
|
||||
uint8_t hold[4];
|
||||
uint8_t *dst_base = dst;
|
||||
size_t limit = (size_t)-1;
|
||||
size_t len = (size_t)-1, mark;
|
||||
const uint8_t *T = base64rfc4648_decode;
|
||||
int skipspace = mode & base64_dec_modifier_skipspace;
|
||||
|
||||
if (src_len) {
|
||||
len = *src_len;
|
||||
}
|
||||
mark = len;
|
||||
mode = mode & ~base64_modifier_mask;
|
||||
switch (mode) {
|
||||
case base64_mode_rfc4648:
|
||||
T = skipspace ? base64rfc4648_decode_skipspace : base64rfc4648_decode;
|
||||
break;
|
||||
case base64_mode_url:
|
||||
T = skipspace ? base64url_decode_skipspace : base64url_decode;
|
||||
break;
|
||||
default:
|
||||
ret = BASE64_EMODE;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (dst_len && *dst_len > 0) {
|
||||
limit = *dst_len;
|
||||
}
|
||||
while(limit > 0) {
|
||||
for (i = 0; i < 4; ++i) {
|
||||
if (len == i) {
|
||||
k = i;
|
||||
len -= i;
|
||||
goto tail;
|
||||
}
|
||||
if ((hold[i] = T[src[i]]) >= cinvalid) {
|
||||
if (hold[i] == cignore) {
|
||||
++src;
|
||||
--len;
|
||||
--i;
|
||||
continue;
|
||||
}
|
||||
k = i;
|
||||
/* Strip padding and ignore hyphen in padding, if present. */
|
||||
if (hold[i] == cpadding) {
|
||||
++i;
|
||||
while (i < len && i < 8) {
|
||||
if (T[src[i]] != cpadding && T[src[i]] != cignore) {
|
||||
break;
|
||||
}
|
||||
++i;
|
||||
}
|
||||
}
|
||||
len -= i;
|
||||
goto tail;
|
||||
}
|
||||
}
|
||||
if (limit < 3) {
|
||||
goto more;
|
||||
}
|
||||
dst[0] = (uint8_t)((hold[0] << 2) | (hold[1] >> 4));
|
||||
dst[1] = (uint8_t)((hold[1] << 4) | (hold[2] >> 2));
|
||||
dst[2] = (uint8_t)((hold[2] << 6) | (hold[3]));
|
||||
dst += 3;
|
||||
src += 4;
|
||||
limit -= 3;
|
||||
len -= 4;
|
||||
mark = len;
|
||||
}
|
||||
done:
|
||||
if (dst_len) {
|
||||
*dst_len = (size_t)(dst - dst_base);
|
||||
}
|
||||
if (src_len) {
|
||||
*src_len -= mark;
|
||||
}
|
||||
return ret;
|
||||
|
||||
tail:
|
||||
switch (k) {
|
||||
case 0:
|
||||
break;
|
||||
case 2:
|
||||
if ((hold[1] << 4) & 0xff) {
|
||||
goto dirty;
|
||||
}
|
||||
if (limit < 1) {
|
||||
goto more;
|
||||
}
|
||||
dst[0] = (uint8_t)((hold[0] << 2) | (hold[1] >> 4));
|
||||
dst += 1;
|
||||
break;
|
||||
case 3:
|
||||
if ((hold[2] << 6) & 0xff) {
|
||||
goto dirty;
|
||||
}
|
||||
if (limit < 2) {
|
||||
goto more;
|
||||
}
|
||||
dst[0] = (uint8_t)((hold[0] << 2) | (hold[1] >> 4));
|
||||
dst[1] = (uint8_t)((hold[1] << 4) | (hold[2] >> 2));
|
||||
dst += 2;
|
||||
break;
|
||||
default:
|
||||
ret = BASE64_ETAIL;
|
||||
goto done;
|
||||
}
|
||||
mark = len;
|
||||
goto done;
|
||||
dirty:
|
||||
ret = BASE64_EDIRTY;
|
||||
goto done;
|
||||
more:
|
||||
ret = BASE64_EMORE;
|
||||
goto done;
|
||||
}
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* PBASE64_H */
|
||||
Reference in New Issue
Block a user