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annotate src/vbuf.c @ 307:db6db9a26a19

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author Carl Byington <carl@five-ten-sg.com>
date Mon, 24 Dec 2012 16:26:39 -0800
parents 320cfcba8058
children 4fd5197aacc2
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rev   line source
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3cb02cb1e6cd Patch from Robert Simpson to fix doubly-linked list in the cache_ptr code, and allow arrays of unicode strings (without converting them).
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1
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2 #include "define.h"
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4 static int unicode_up = 0;
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5 static iconv_t i16to8;
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6 static const char *target_charset = NULL;
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7 static int target_open_from = 0;
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8 static int target_open_to = 0;
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9 static iconv_t i8totarget = (iconv_t)-1;
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10 static iconv_t target2i8 = (iconv_t)-1;
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13 #define ASSERT(x,...) { if( !(x) ) DIE(( __VA_ARGS__)); }
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15
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16 /** DESTRUCTIVELY grow or shrink buffer
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17 */
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18 static void pst_vbresize(pst_vbuf *vb, size_t len);
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19 static void pst_vbresize(pst_vbuf *vb, size_t len)
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20 {
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21 vb->dlen = 0;
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22
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23 if (vb->blen >= len) {
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24 vb->b = vb->buf;
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25 return;
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26 }
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28 vb->buf = realloc(vb->buf, len);
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29 vb->b = vb->buf;
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30 vb->blen = len;
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31 }
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33
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34 static size_t pst_vbavail(pst_vbuf * vb);
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35 static size_t pst_vbavail(pst_vbuf * vb)
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36 {
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37 return vb->blen - vb->dlen - (size_t)(vb->b - vb->buf);
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38 }
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41 static void open_targets(const char* charset);
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42 static void open_targets(const char* charset)
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43 {
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44 if (!target_charset || strcasecmp(target_charset, charset)) {
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45 if (target_open_from) iconv_close(i8totarget);
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46 if (target_open_to) iconv_close(target2i8);
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47 if (target_charset) free((char *)target_charset);
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48 target_charset = strdup(charset);
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49 target_open_from = 1;
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50 target_open_to = 1;
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51 i8totarget = iconv_open(target_charset, "utf-8");
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52 if (i8totarget == (iconv_t)-1) {
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53 target_open_from = 0;
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54 DEBUG_WARN(("Couldn't open iconv descriptor for utf-8 to %s.\n", target_charset));
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55 }
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56 target2i8 = iconv_open("utf-8", target_charset);
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57 if (target2i8 == (iconv_t)-1) {
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58 target_open_to = 0;
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59 DEBUG_WARN(("Couldn't open iconv descriptor for %s to utf-8.\n", target_charset));
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60 }
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61 }
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62 }
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64
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65 static size_t sbcs_conversion(pst_vbuf *dest, const char *inbuf, int iblen, iconv_t conversion);
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66 static size_t sbcs_conversion(pst_vbuf *dest, const char *inbuf, int iblen, iconv_t conversion)
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67 {
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68 size_t inbytesleft = iblen;
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69 size_t icresult = (size_t)-1;
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70 size_t outbytesleft = 0;
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71 char *outbuf = NULL;
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72 int myerrno;
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73
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74 pst_vbresize(dest, 2*iblen);
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75
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76 do {
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77 outbytesleft = dest->blen - dest->dlen;
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78 outbuf = dest->b + dest->dlen;
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79 icresult = iconv(conversion, (ICONV_CONST char**)&inbuf, &inbytesleft, &outbuf, &outbytesleft);
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80 myerrno = errno;
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81 dest->dlen = outbuf - dest->b;
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82 if (inbytesleft) pst_vbgrow(dest, 2*inbytesleft);
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83 } while ((size_t)-1 == icresult && E2BIG == myerrno);
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84
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85 if (icresult == (size_t)-1) {
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86 DEBUG_WARN(("iconv failure: %s\n", strerror(myerrno)));
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87 pst_unicode_init();
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88 return (size_t)-1;
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89 }
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90 return (icresult) ? (size_t)-1 : 0;
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91 }
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92
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93
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94 static void pst_unicode_close();
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95 static void pst_unicode_close()
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96 {
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97 iconv_close(i16to8);
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98 if (target_open_from) iconv_close(i8totarget);
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99 if (target_open_to) iconv_close(target2i8);
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100 if (target_charset) free((char *)target_charset);
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101 target_charset = NULL;
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102 target_open_from = 0;
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103 target_open_to = 0;
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104 unicode_up = 0;
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105 }
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106
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107
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108 static int utf16_is_terminated(const char *str, int length);
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109 static int utf16_is_terminated(const char *str, int length)
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110 {
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111 int len = -1;
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112 int i;
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113 for (i = 0; i < length; i += 2) {
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114 if (str[i] == 0 && str[i + 1] == 0) {
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115 len = i;
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116 }
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117 }
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118
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119 if (len == -1) {
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120 DEBUG_WARN(("utf16 string is not zero terminated\n"));
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121 }
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122
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123 return (len == -1) ? 0 : 1;
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124 }
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125
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126
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127 pst_vbuf *pst_vballoc(size_t len)
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128 {
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129 pst_vbuf *result = pst_malloc(sizeof(pst_vbuf));
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130 if (result) {
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131 result->dlen = 0;
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132 result->blen = 0;
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133 result->buf = NULL;
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134 pst_vbresize(result, len);
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135 }
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136 else DIE(("malloc() failure"));
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137 return result;
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138 }
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139
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140
182
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141 /** out: vbavail(vb) >= len, data are preserved
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142 */
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143 void pst_vbgrow(pst_vbuf *vb, size_t len)
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144 {
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145 if (0 == len)
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146 return;
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147
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148 if (0 == vb->blen) {
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149 pst_vbresize(vb, len);
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150 return;
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151 }
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152
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153 if (vb->dlen + len > vb->blen) {
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154 if (vb->dlen + len < vb->blen * 1.5)
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155 len = vb->blen * 1.5;
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156 char *nb = pst_malloc(vb->blen + len);
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157 if (!nb) DIE(("malloc() failure"));
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158 vb->blen = vb->blen + len;
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159 memcpy(nb, vb->b, vb->dlen);
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160
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161 free(vb->buf);
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162 vb->buf = nb;
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163 vb->b = vb->buf;
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164 } else {
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165 if (vb->b != vb->buf)
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166 memcpy(vb->buf, vb->b, vb->dlen);
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167 }
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168
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169 vb->b = vb->buf;
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170
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171 ASSERT(pst_vbavail(vb) >= len, "vbgrow(): I have failed in my mission.");
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172 }
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173
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174
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175 /** set vbuf b size=len, resize if necessary, relen = how much to over-allocate
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176 */
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177 void pst_vbset(pst_vbuf * vb, void *b, size_t len)
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178 {
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179 pst_vbresize(vb, len);
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180 memcpy(vb->b, b, len);
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181 vb->dlen = len;
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182 }
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183
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184
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185 /** append len bytes of b to vb, resize if necessary
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186 */
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187 void pst_vbappend(pst_vbuf *vb, void *b, size_t len)
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188 {
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189 if (0 == vb->dlen) {
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190 pst_vbset(vb, b, len);
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191 return;
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192 }
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193 pst_vbgrow(vb, len);
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194 memcpy(vb->b + vb->dlen, b, len);
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195 vb->dlen += len;
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196 }
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197
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198
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199 void pst_unicode_init()
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200 {
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201 if (unicode_up) pst_unicode_close();
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202 i16to8 = iconv_open("utf-8", "utf-16le");
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203 if (i16to8 == (iconv_t)-1) {
195
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204 DEBUG_WARN(("Couldn't open iconv descriptor for utf-16le to utf-8.\n"));
182
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205 }
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206 unicode_up = 1;
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207 }
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208
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209
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210 size_t pst_vb_utf16to8(pst_vbuf *dest, const char *inbuf, int iblen)
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211 {
116
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212 size_t inbytesleft = iblen;
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213 size_t icresult = (size_t)-1;
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214 size_t outbytesleft = 0;
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215 char *outbuf = NULL;
164
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216 int myerrno;
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217
195
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218 if (!unicode_up) return (size_t)-1; // failure to open iconv
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219 pst_vbresize(dest, iblen);
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220
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221 //Bad Things can happen if a non-zero-terminated utf16 string comes through here
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222 if (!utf16_is_terminated(inbuf, iblen))
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223 return (size_t)-1;
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224
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225 do {
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226 outbytesleft = dest->blen - dest->dlen;
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227 outbuf = dest->b + dest->dlen;
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228 icresult = iconv(i16to8, (ICONV_CONST char**)&inbuf, &inbytesleft, &outbuf, &outbytesleft);
164
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229 myerrno = errno;
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230 dest->dlen = outbuf - dest->b;
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231 if (inbytesleft) pst_vbgrow(dest, inbytesleft);
164
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232 } while ((size_t)-1 == icresult && E2BIG == myerrno);
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233
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234 if (icresult == (size_t)-1) {
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235 DEBUG_WARN(("iconv failure: %s\n", strerror(myerrno)));
172
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236 pst_unicode_init();
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237 return (size_t)-1;
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238 }
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239 return (icresult) ? (size_t)-1 : 0;
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240 }
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241
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242
182
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243 size_t pst_vb_utf8to8bit(pst_vbuf *dest, const char *inbuf, int iblen, const char* charset)
151
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244 {
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diff changeset
245 open_targets(charset);
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246 if (!target_open_from) return (size_t)-1; // failure to open the target
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247 return sbcs_conversion(dest, inbuf, iblen, i8totarget);
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248 }
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249
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diff changeset
250
182
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251 size_t pst_vb_8bit2utf8(pst_vbuf *dest, const char *inbuf, int iblen, const char* charset)
151
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252 {
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diff changeset
253 open_targets(charset);
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254 if (!target_open_to) return (size_t)-1; // failure to open the target
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255 return sbcs_conversion(dest, inbuf, iblen, target2i8);
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256 }
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diff changeset
257