From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- third_party/sipcc/sdp_base64.c | 403 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 403 insertions(+) create mode 100644 third_party/sipcc/sdp_base64.c (limited to 'third_party/sipcc/sdp_base64.c') diff --git a/third_party/sipcc/sdp_base64.c b/third_party/sipcc/sdp_base64.c new file mode 100644 index 0000000000..80f1eb52da --- /dev/null +++ b/third_party/sipcc/sdp_base64.c @@ -0,0 +1,403 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "sdp_base64.h" + +/* + * Local definitions for Base64 to Raw table entries. + */ +#define INVALID_CHAR 0xFF /* Character not in supported Base64 set */ +#define WHITE_SPACE 0xFE /* Space, tab, newline, etc character */ +#define PADDING 0xFD /* The character '=' */ + +#define PAD_CHAR '=' /* The character '=' */ + +/* Maximum length of a base64 encoded line */ +#define MAX_BASE64_LINE_LENGTH 76 + +/* + * base64_result_table + * String table for translating base64 error codes into human + * understanable strings. + */ +char *base64_result_table[BASE64_RESULT_MAX] = +{ + "Base64 successful", + "Base64 Buffer Overrun", + "Base64 Bad Data", + "Base64 Bad Padding", + "Base64 Bad Block Size" +}; + +/* + * base64_to_raw_table + * Heart of the Base64 decoding algorithm. Lookup table to convert + * the Base64 characters into their specified representative values. + * Invalid characters are marked with 0xFF, white space characters + * are marked with 0xFE, and the special pading character is marked + * with 0xFD. + */ +unsigned char base64_to_raw_table[128] = +{ + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, /* 0-9 */ + 0xFE, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 10-19 */ + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 20-29 */ + 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 30-39 */ + 0xFF, 0xFF, 0xFF, 62, 0xFF, 0xFF, 0xFF, 63, 52, 53, /* 40-49 */ + 54, 55, 56, 57, 58, 59, 60, 61, 0xFF, 0xFF, /* 50-59 */ + 0xFF, 0xFD, 0xFF, 0xFF, 0xFF, 0, 1, 2, 3, 4, /* 60-69 */ + 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 70-79 */ + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, /* 80-89 */ + 25, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 26, 27, 28, /* 90-99 */ + 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, /* 100-109 */ + 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, /* 110-119 */ + 49, 50, 51, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF /* 120-127 */ +}; + +unsigned char raw_to_base64_table[64] = +{ + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', /* 0-9 */ + 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 10-19 */ + 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', /* 20-29 */ + 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 30-39 */ + 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', /* 40-49 */ + 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', /* 50-59 */ + '8', '9', '+', '/' /* 60-63 */ +}; + +/* + * base64_encode_size_bytes + * + * DESCRIPTION + * Estimates the size of buffer required for holding the result of + * encoding data of size raw_size_bytes. + * + * PARAMETERS + * raw_size_bytes = Estimated size of the un-encoded data in bytes. + * + * RETURN VALUE + * The size of destination buffer to use for encoding in bytes. + */ +int base64_est_encode_size_bytes (int raw_size_bytes) +{ + int length; + + /* + * Find the number of bytes needed to represent the data + * using a 4/3 expansion ratio. That result must be + * rounded to the next higher multiple of four to account + * for padding. Then add in a term to account for any '\n's + * added. + */ + length = ((((raw_size_bytes * 4 + 2)/ 3) + 3) & ~(0x3)) + + raw_size_bytes / MAX_BASE64_LINE_LENGTH; + + return length; +} + +/* + * base64_decode_size_bytes + * + * DESCRIPTION + * Estimates the size of buffer required for holding the result of + * decoding data of size base64_size_bytes. + * + * PARAMETERS + * base64_size_bytes = Estimated size of the Base64 data in bytes. + * + * RETURN VALUE + * The size of destination buffer to use for decoding in bytes. + */ +int base64_est_decode_size_bytes (int base64_size_bytes) +{ + int length; + + length = (base64_size_bytes * 3 + 3) / 4; + return length; +} + +/* + * base64_encode + * + * DESCRIPTION + * Encode data pointed to by src into the buffer pointer to by dest + * using the Base64 algorithm. + * + * NOTE: No trailing '\n' character will be added. + * + * NOTE: As per specification, '\n' will be placed every 76 chars. + * + * PARAMETERS + * src = Pointer to the raw data to base64 encode. + * src_bytes = The number of bytes in the src buffer to encode. + * dest = Pointer to the destination buffer where the converted data + * will reside when complete. + * dest_bytes = Initially holds the size of the destination buffer + * but at completion holds the number of bytes converted. + * + * RETURN VALUE + * base64_success if the buffer was successfully converted, the + * appropriate error code otherwise. + * + * The dest parameter holds the converted data. + * + * The dest_bytes parameter holds the actual number of bytes converted. + */ +base64_result_t base64_encode(unsigned char *src, int src_bytes, unsigned char *dest, int *dest_bytes) +{ + int i, j=0; + int line_count = 0; + unsigned char index; /* index into base64 lookup table */ + int smax = src_bytes-2; /* only do full multiples of 3 */ + int dmax = *dest_bytes; /* destination maximum */ + + *dest_bytes = 0; + + /* Do full groups. Base64 must be done in blocks of 3 src bytes */ + for (i=0; i=MAX_BASE64_LINE_LENGTH) { + if (j> 2) & 0x3F; + dest[j++] = raw_to_base64_table[index]; + + /* bottom 2 bits of first word, high 4 bits of second word */ + index = ((src[i] << 4) & 0x30) | ((src[i+1] >> 4) & 0x0F); + dest[j++] = raw_to_base64_table[index]; + + /* bottom 4 bits of second word, high 2 bits of third word */ + index = ((src[i+1] << 2) & 0x3C) | ((src[i+2] >> 6) & 0x03); + dest[j++] = raw_to_base64_table[index]; + + /* bottom 6 bits of third word */ + index = src[i+2] & 0x3F; + dest[j++] = raw_to_base64_table[index]; + } else { + return BASE64_BUFFER_OVERRUN; + } + } + + /* Check to see if any more work must be done */ + if (i=MAX_BASE64_LINE_LENGTH) { + if (jdmax) { + /* No room left in output buffer! */ + return BASE64_BUFFER_OVERRUN; + } + + /* Find mapping of upper 6 bits */ + index = (src[i] >> 2) & 0x3F; + dest[j++] = raw_to_base64_table[index]; + + /* check for another stragler */ + if ((i+1)> 4) & 0x0F); + dest[j++] = raw_to_base64_table[index]; + + /* bottom 4 bits of second word */ + index = (src[i+1] << 2) & 0x3C; + dest[j++] = raw_to_base64_table[index]; + dest[j++] = PAD_CHAR; + } else { + /* bottom 2 bits of first word */ + index = (src[i] << 4) & 0x30; + dest[j++] = raw_to_base64_table[index]; + dest[j++] = PAD_CHAR; + dest[j++] = PAD_CHAR; + } + } + + *dest_bytes = j; + + return BASE64_SUCCESS; +} + +unsigned char base64_decode_get_raw(unsigned char index) +{ + /* only have 128 values, MSB must not be set! */ + if (index >= 128) { + return INVALID_CHAR; + } + return base64_to_raw_table[index]; +} + +/* + * base64_decode + * + * DESCRIPTION + * Decode data pointed to by src into the buffer pointer to by dest + * using the Base64 algorithm. + * + * PARAMETERS + * src = Pointer to the Base64 data to decode. + * src_bytes = The number of bytes in the src buffer to decode. + * dest = Pointer to the destination buffer where the converted data + * will reside when complete. + * dest_bytes = Initially holds the size of the destination buffer + * but at completion holds the number of bytes converted. + * + * RETURN VALUE + * base64_success if the buffer was successfully converted, the + * appropriate error code otherwise. + * + * The dest parameter holds the converted data. + * + * The dest_bytes parameter holds the actual number of bytes converted. + */ +base64_result_t base64_decode(unsigned char *src, int src_bytes, unsigned char *dest, int *dest_bytes) +{ + int i, j = 0; + int sindex = 0; /* Current NON-whitespace source + * index */ + int pad_count=0; /* Number of padding characters + * encountered */ + int dest_size_bytes = *dest_bytes; /* Save size of destination buffer */ + unsigned char cindex; /* The current Base64 character to + * process */ + unsigned char val; /* The value of the current Base64 + * character */ + + *dest_bytes = 0; + + for (i=0; i> 4; + + if (j=src_bytes) || + (base64_decode_get_raw(src[i+1]) != PADDING)) { + return BASE64_BUFFER_OVERRUN; + } + } + break; + case 2: + /* Fill Bottom 4 bits */ + dest[j++] |= val >> 2; + + if (j=src_bytes) || + (base64_decode_get_raw(src[i+1]) != PADDING)) { + return BASE64_BUFFER_OVERRUN; + } + } + break; + case 3: + /* + * No need to check for overrun here since the + * previous case was already checked. If another + * group is present then case 0 will check again. + */ + + /* Fill Bottom 6 bits */ + dest[j++] |= val; + break; + } + sindex++; + } + + /* Check length for multiple of 3 bytes */ + if (((j + pad_count)% 3) != 0) { + return BASE64_BAD_BLOCK_SIZE; + } + + /* Save off the number of bytes converted */ + *dest_bytes = j; + + return BASE64_SUCCESS; +} -- cgit v1.2.3