1 | /* crypto/bio/bf_buff.c */ |
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2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 | * All rights reserved. |
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4 | * |
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5 | * This package is an SSL implementation written |
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6 | * by Eric Young (eay@cryptsoft.com). |
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7 | * The implementation was written so as to conform with Netscapes SSL. |
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8 | * |
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9 | * This library is free for commercial and non-commercial use as long as |
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10 | * the following conditions are aheared to. The following conditions |
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11 | * apply to all code found in this distribution, be it the RC4, RSA, |
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12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 | * included with this distribution is covered by the same copyright terms |
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14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 | * |
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16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 | * the code are not to be removed. |
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18 | * If this package is used in a product, Eric Young should be given attribution |
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19 | * as the author of the parts of the library used. |
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20 | * This can be in the form of a textual message at program startup or |
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21 | * in documentation (online or textual) provided with the package. |
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22 | * |
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23 | * Redistribution and use in source and binary forms, with or without |
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24 | * modification, are permitted provided that the following conditions |
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25 | * are met: |
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26 | * 1. Redistributions of source code must retain the copyright |
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27 | * notice, this list of conditions and the following disclaimer. |
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28 | * 2. Redistributions in binary form must reproduce the above copyright |
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29 | * notice, this list of conditions and the following disclaimer in the |
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30 | * documentation and/or other materials provided with the distribution. |
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31 | * 3. All advertising materials mentioning features or use of this software |
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32 | * must display the following acknowledgement: |
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33 | * "This product includes cryptographic software written by |
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34 | * Eric Young (eay@cryptsoft.com)" |
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35 | * The word 'cryptographic' can be left out if the rouines from the library |
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36 | * being used are not cryptographic related :-). |
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37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 | * the apps directory (application code) you must include an acknowledgement: |
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39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 | * |
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41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 | * SUCH DAMAGE. |
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52 | * |
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53 | * The licence and distribution terms for any publically available version or |
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54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 | * copied and put under another distribution licence |
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56 | * [including the GNU Public Licence.] |
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57 | */ |
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58 | |
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59 | #include <stdio.h> |
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60 | #include <errno.h> |
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61 | #include <openssl/cryptlib.h> |
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62 | #include <openssl/bio.h> |
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63 | |
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64 | static int buffer_write(BIO *h, const char *buf,int num); |
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65 | static int buffer_read(BIO *h, char *buf, int size); |
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66 | static int buffer_puts(BIO *h, const char *str); |
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67 | static int buffer_gets(BIO *h, char *str, int size); |
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68 | static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
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69 | static int buffer_new(BIO *h); |
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70 | static int buffer_free(BIO *data); |
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71 | static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
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72 | #define DEFAULT_BUFFER_SIZE 4096 |
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73 | |
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74 | static BIO_METHOD methods_buffer= |
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75 | { |
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76 | BIO_TYPE_BUFFER, |
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77 | "buffer", |
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78 | buffer_write, |
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79 | buffer_read, |
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80 | buffer_puts, |
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81 | buffer_gets, |
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82 | buffer_ctrl, |
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83 | buffer_new, |
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84 | buffer_free, |
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85 | buffer_callback_ctrl, |
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86 | }; |
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87 | |
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88 | BIO_METHOD *BIO_f_buffer(void) |
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89 | { |
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90 | return(&methods_buffer); |
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91 | } |
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92 | |
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93 | static int buffer_new(BIO *bi) |
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94 | { |
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95 | BIO_F_BUFFER_CTX *ctx; |
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96 | |
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97 | ctx=(BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX)); |
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98 | if (ctx == NULL) return(0); |
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99 | ctx->ibuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE); |
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100 | if (ctx->ibuf == NULL) { OPENSSL_free(ctx); return(0); } |
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101 | ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE); |
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102 | if (ctx->obuf == NULL) { OPENSSL_free(ctx->ibuf); OPENSSL_free(ctx); return(0); } |
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103 | ctx->ibuf_size=DEFAULT_BUFFER_SIZE; |
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104 | ctx->obuf_size=DEFAULT_BUFFER_SIZE; |
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105 | ctx->ibuf_len=0; |
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106 | ctx->ibuf_off=0; |
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107 | ctx->obuf_len=0; |
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108 | ctx->obuf_off=0; |
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109 | |
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110 | bi->init=1; |
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111 | bi->ptr=(char *)ctx; |
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112 | bi->flags=0; |
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113 | return(1); |
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114 | } |
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115 | |
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116 | static int buffer_free(BIO *a) |
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117 | { |
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118 | BIO_F_BUFFER_CTX *b; |
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119 | |
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120 | if (a == NULL) return(0); |
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121 | b=(BIO_F_BUFFER_CTX *)a->ptr; |
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122 | if (b->ibuf != NULL) OPENSSL_free(b->ibuf); |
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123 | if (b->obuf != NULL) OPENSSL_free(b->obuf); |
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124 | OPENSSL_free(a->ptr); |
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125 | a->ptr=NULL; |
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126 | a->init=0; |
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127 | a->flags=0; |
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128 | return(1); |
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129 | } |
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130 | |
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131 | static int buffer_read(BIO *b, char *out, int outl) |
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132 | { |
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133 | int i,num=0; |
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134 | BIO_F_BUFFER_CTX *ctx; |
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135 | |
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136 | if (out == NULL) return(0); |
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137 | ctx=(BIO_F_BUFFER_CTX *)b->ptr; |
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138 | |
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139 | if ((ctx == NULL) || (b->next_bio == NULL)) return(0); |
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140 | num=0; |
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141 | BIO_clear_retry_flags(b); |
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142 | |
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143 | start: |
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144 | i=ctx->ibuf_len; |
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145 | /* If there is stuff left over, grab it */ |
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146 | if (i != 0) |
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147 | { |
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148 | if (i > outl) i=outl; |
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149 | memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i); |
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150 | ctx->ibuf_off+=i; |
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151 | ctx->ibuf_len-=i; |
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152 | num+=i; |
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153 | if (outl == i) return(num); |
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154 | outl-=i; |
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155 | out+=i; |
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156 | } |
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157 | |
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158 | /* We may have done a partial read. try to do more. |
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159 | * We have nothing in the buffer. |
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160 | * If we get an error and have read some data, just return it |
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161 | * and let them retry to get the error again. |
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162 | * copy direct to parent address space */ |
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163 | if (outl > ctx->ibuf_size) |
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164 | { |
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165 | for (;;) |
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166 | { |
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167 | i=BIO_read(b->next_bio,out,outl); |
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168 | if (i <= 0) |
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169 | { |
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170 | BIO_copy_next_retry(b); |
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171 | if (i < 0) return((num > 0)?num:i); |
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172 | if (i == 0) return(num); |
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173 | } |
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174 | num+=i; |
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175 | if (outl == i) return(num); |
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176 | out+=i; |
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177 | outl-=i; |
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178 | } |
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179 | } |
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180 | /* else */ |
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181 | |
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182 | /* we are going to be doing some buffering */ |
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183 | i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size); |
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184 | if (i <= 0) |
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185 | { |
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186 | BIO_copy_next_retry(b); |
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187 | if (i < 0) return((num > 0)?num:i); |
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188 | if (i == 0) return(num); |
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189 | } |
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190 | ctx->ibuf_off=0; |
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191 | ctx->ibuf_len=i; |
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192 | |
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193 | /* Lets re-read using ourselves :-) */ |
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194 | goto start; |
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195 | } |
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196 | |
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197 | static int buffer_write(BIO *b, const char *in, int inl) |
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198 | { |
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199 | int i,num=0; |
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200 | BIO_F_BUFFER_CTX *ctx; |
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201 | |
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202 | if ((in == NULL) || (inl <= 0)) return(0); |
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203 | ctx=(BIO_F_BUFFER_CTX *)b->ptr; |
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204 | if ((ctx == NULL) || (b->next_bio == NULL)) return(0); |
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205 | |
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206 | BIO_clear_retry_flags(b); |
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207 | start: |
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208 | i=ctx->obuf_size-(ctx->obuf_len+ctx->obuf_off); |
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209 | /* add to buffer and return */ |
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210 | if (i >= inl) |
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211 | { |
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212 | memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl); |
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213 | ctx->obuf_len+=inl; |
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214 | return(num+inl); |
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215 | } |
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216 | /* else */ |
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217 | /* stuff already in buffer, so add to it first, then flush */ |
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218 | if (ctx->obuf_len != 0) |
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219 | { |
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220 | if (i > 0) /* lets fill it up if we can */ |
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221 | { |
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222 | memcpy(&(ctx->obuf[ctx->obuf_len]),in,i); |
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223 | in+=i; |
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224 | inl-=i; |
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225 | num+=i; |
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226 | ctx->obuf_len+=i; |
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227 | } |
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228 | /* we now have a full buffer needing flushing */ |
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229 | for (;;) |
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230 | { |
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231 | i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]), |
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232 | ctx->obuf_len); |
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233 | if (i <= 0) |
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234 | { |
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235 | BIO_copy_next_retry(b); |
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236 | |
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237 | if (i < 0) return((num > 0)?num:i); |
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238 | if (i == 0) return(num); |
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239 | } |
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240 | ctx->obuf_off+=i; |
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241 | ctx->obuf_len-=i; |
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242 | if (ctx->obuf_len == 0) break; |
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243 | } |
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244 | } |
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245 | /* we only get here if the buffer has been flushed and we |
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246 | * still have stuff to write */ |
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247 | ctx->obuf_off=0; |
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248 | |
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249 | /* we now have inl bytes to write */ |
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250 | while (inl >= ctx->obuf_size) |
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251 | { |
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252 | i=BIO_write(b->next_bio,in,inl); |
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253 | if (i <= 0) |
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254 | { |
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255 | BIO_copy_next_retry(b); |
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256 | if (i < 0) return((num > 0)?num:i); |
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257 | if (i == 0) return(num); |
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258 | } |
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259 | num+=i; |
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260 | in+=i; |
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261 | inl-=i; |
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262 | if (inl == 0) return(num); |
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263 | } |
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264 | |
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265 | /* copy the rest into the buffer since we have only a small |
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266 | * amount left */ |
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267 | goto start; |
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268 | } |
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269 | |
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270 | static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr) |
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271 | { |
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272 | BIO *dbio; |
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273 | BIO_F_BUFFER_CTX *ctx; |
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274 | long ret=1; |
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275 | char *p1,*p2; |
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276 | int r,i,*ip; |
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277 | int ibs,obs; |
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278 | |
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279 | ctx=(BIO_F_BUFFER_CTX *)b->ptr; |
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280 | |
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281 | switch (cmd) |
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282 | { |
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283 | case BIO_CTRL_RESET: |
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284 | ctx->ibuf_off=0; |
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285 | ctx->ibuf_len=0; |
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286 | ctx->obuf_off=0; |
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287 | ctx->obuf_len=0; |
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288 | if (b->next_bio == NULL) return(0); |
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289 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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290 | break; |
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291 | case BIO_CTRL_INFO: |
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292 | ret=(long)ctx->obuf_len; |
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293 | break; |
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294 | case BIO_C_GET_BUFF_NUM_LINES: |
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295 | ret=0; |
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296 | p1=ctx->ibuf; |
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297 | for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++) |
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298 | { |
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299 | if (p1[i] == '\n') ret++; |
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300 | } |
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301 | break; |
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302 | case BIO_CTRL_WPENDING: |
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303 | ret=(long)ctx->obuf_len; |
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304 | if (ret == 0) |
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305 | { |
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306 | if (b->next_bio == NULL) return(0); |
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307 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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308 | } |
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309 | break; |
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310 | case BIO_CTRL_PENDING: |
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311 | ret=(long)ctx->ibuf_len; |
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312 | if (ret == 0) |
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313 | { |
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314 | if (b->next_bio == NULL) return(0); |
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315 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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316 | } |
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317 | break; |
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318 | case BIO_C_SET_BUFF_READ_DATA: |
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319 | if (num > ctx->ibuf_size) |
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320 | { |
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321 | p1=OPENSSL_malloc((int)num); |
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322 | if (p1 == NULL) goto malloc_error; |
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323 | if (ctx->ibuf != NULL) OPENSSL_free(ctx->ibuf); |
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324 | ctx->ibuf=p1; |
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325 | } |
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326 | ctx->ibuf_off=0; |
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327 | ctx->ibuf_len=(int)num; |
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328 | memcpy(ctx->ibuf,ptr,(int)num); |
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329 | ret=1; |
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330 | break; |
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331 | case BIO_C_SET_BUFF_SIZE: |
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332 | if (ptr != NULL) |
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333 | { |
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334 | ip=(int *)ptr; |
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335 | if (*ip == 0) |
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336 | { |
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337 | ibs=(int)num; |
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338 | obs=ctx->obuf_size; |
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339 | } |
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340 | else /* if (*ip == 1) */ |
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341 | { |
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342 | ibs=ctx->ibuf_size; |
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343 | obs=(int)num; |
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344 | } |
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345 | } |
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346 | else |
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347 | { |
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348 | ibs=(int)num; |
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349 | obs=(int)num; |
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350 | } |
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351 | p1=ctx->ibuf; |
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352 | p2=ctx->obuf; |
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353 | if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) |
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354 | { |
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355 | p1=(char *)OPENSSL_malloc((int)num); |
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356 | if (p1 == NULL) goto malloc_error; |
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357 | } |
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358 | if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) |
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359 | { |
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360 | p2=(char *)OPENSSL_malloc((int)num); |
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361 | if (p2 == NULL) |
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362 | { |
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363 | if (p1 != ctx->ibuf) OPENSSL_free(p1); |
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364 | goto malloc_error; |
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365 | } |
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366 | } |
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367 | if (ctx->ibuf != p1) |
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368 | { |
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369 | OPENSSL_free(ctx->ibuf); |
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370 | ctx->ibuf=p1; |
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371 | ctx->ibuf_off=0; |
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372 | ctx->ibuf_len=0; |
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373 | ctx->ibuf_size=ibs; |
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374 | } |
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375 | if (ctx->obuf != p2) |
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376 | { |
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377 | OPENSSL_free(ctx->obuf); |
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378 | ctx->obuf=p2; |
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379 | ctx->obuf_off=0; |
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380 | ctx->obuf_len=0; |
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381 | ctx->obuf_size=obs; |
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382 | } |
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383 | break; |
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384 | case BIO_C_DO_STATE_MACHINE: |
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385 | if (b->next_bio == NULL) return(0); |
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386 | BIO_clear_retry_flags(b); |
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387 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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388 | BIO_copy_next_retry(b); |
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389 | break; |
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390 | |
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391 | case BIO_CTRL_FLUSH: |
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392 | if (b->next_bio == NULL) return(0); |
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393 | if (ctx->obuf_len <= 0) |
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394 | { |
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395 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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396 | break; |
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397 | } |
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398 | |
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399 | for (;;) |
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400 | { |
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401 | BIO_clear_retry_flags(b); |
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402 | if (ctx->obuf_len > ctx->obuf_off) |
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403 | { |
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404 | r=BIO_write(b->next_bio, |
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405 | &(ctx->obuf[ctx->obuf_off]), |
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406 | ctx->obuf_len-ctx->obuf_off); |
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407 | #if 0 |
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408 | fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r); |
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409 | #endif |
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410 | BIO_copy_next_retry(b); |
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411 | if (r <= 0) return((long)r); |
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412 | ctx->obuf_off+=r; |
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413 | } |
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414 | else |
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415 | { |
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416 | ctx->obuf_len=0; |
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417 | ctx->obuf_off=0; |
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418 | ret=1; |
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419 | break; |
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420 | } |
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421 | } |
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422 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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423 | break; |
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424 | case BIO_CTRL_DUP: |
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425 | dbio=(BIO *)ptr; |
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426 | if ( !BIO_set_read_buffer_size(dbio,ctx->ibuf_size) || |
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427 | !BIO_set_write_buffer_size(dbio,ctx->obuf_size)) |
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428 | ret=0; |
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429 | break; |
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430 | default: |
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431 | if (b->next_bio == NULL) return(0); |
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432 | ret=BIO_ctrl(b->next_bio,cmd,num,ptr); |
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433 | break; |
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434 | } |
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435 | return(ret); |
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436 | malloc_error: |
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437 | BIOerr(BIO_F_BUFFER_CTRL,ERR_R_MALLOC_FAILURE); |
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438 | return(0); |
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439 | } |
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440 | |
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441 | static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
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442 | { |
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443 | long ret=1; |
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444 | |
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445 | if (b->next_bio == NULL) return(0); |
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446 | switch (cmd) |
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447 | { |
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448 | default: |
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449 | ret=BIO_callback_ctrl(b->next_bio,cmd,fp); |
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450 | break; |
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451 | } |
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452 | return(ret); |
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453 | } |
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454 | |
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455 | static int buffer_gets(BIO *b, char *buf, int size) |
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456 | { |
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457 | BIO_F_BUFFER_CTX *ctx; |
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458 | int num=0,i,flag; |
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459 | char *p; |
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460 | |
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461 | ctx=(BIO_F_BUFFER_CTX *)b->ptr; |
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462 | size--; /* reserve space for a '\0' */ |
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463 | BIO_clear_retry_flags(b); |
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464 | |
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465 | for (;;) |
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466 | { |
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467 | if (ctx->ibuf_len > 0) |
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468 | { |
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469 | p= &(ctx->ibuf[ctx->ibuf_off]); |
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470 | flag=0; |
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471 | for (i=0; (i<ctx->ibuf_len) && (i<size); i++) |
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472 | { |
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473 | *(buf++)=p[i]; |
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474 | if (p[i] == '\n') |
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475 | { |
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476 | flag=1; |
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477 | i++; |
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478 | break; |
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479 | } |
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480 | } |
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481 | num+=i; |
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482 | size-=i; |
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483 | ctx->ibuf_len-=i; |
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484 | ctx->ibuf_off+=i; |
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485 | if (flag || size == 0) |
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486 | { |
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487 | *buf='\0'; |
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488 | return(num); |
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489 | } |
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490 | } |
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491 | else /* read another chunk */ |
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492 | { |
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493 | i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size); |
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494 | if (i <= 0) |
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495 | { |
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496 | BIO_copy_next_retry(b); |
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497 | *buf='\0'; |
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498 | if (i < 0) return((num > 0)?num:i); |
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499 | if (i == 0) return(num); |
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500 | } |
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501 | ctx->ibuf_len=i; |
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502 | ctx->ibuf_off=0; |
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503 | } |
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504 | } |
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505 | } |
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506 | |
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507 | static int buffer_puts(BIO *b, const char *str) |
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508 | { |
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509 | return(buffer_write(b,str,strlen(str))); |
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510 | } |
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511 | |
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