1 | /* |
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2 | * xmlIO.c : implementation of the I/O interfaces used by the parser |
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3 | * |
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4 | * See Copyright for the status of this software. |
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5 | * |
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6 | * Daniel.Veillard@w3.org |
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7 | */ |
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8 | |
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9 | #ifdef WIN32 |
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10 | #include "win32config.h" |
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11 | #else |
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12 | #include "config.h" |
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13 | #endif |
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14 | |
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15 | #include <stdio.h> |
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16 | #include <string.h> |
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17 | |
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18 | #ifdef HAVE_SYS_TYPES_H |
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19 | #include <sys/types.h> |
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20 | #endif |
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21 | #ifdef HAVE_SYS_STAT_H |
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22 | #include <sys/stat.h> |
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23 | #endif |
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24 | #ifdef HAVE_FCNTL_H |
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25 | #include <fcntl.h> |
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26 | #endif |
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27 | #ifdef HAVE_UNISTD_H |
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28 | #include <unistd.h> |
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29 | #endif |
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30 | #ifdef HAVE_STDLIB_H |
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31 | #include <stdlib.h> |
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32 | #endif |
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33 | #ifdef HAVE_ZLIB_H |
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34 | #include <zlib.h> |
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35 | #endif |
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36 | |
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37 | #include "xmlmemory.h" |
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38 | #include "parser.h" |
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39 | #include "parserInternals.h" |
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40 | #include "xmlIO.h" |
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41 | #include "nanohttp.h" |
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42 | #include "nanoftp.h" |
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43 | |
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44 | /* #define DEBUG_INPUT */ |
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45 | /* #define VERBOSE_FAILURE */ |
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46 | /* #define DEBUG_EXTERNAL_ENTITIES */ |
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47 | |
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48 | #ifdef DEBUG_INPUT |
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49 | #define MINLEN 40 |
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50 | #else |
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51 | #define MINLEN 4000 |
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52 | #endif |
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53 | |
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54 | /** |
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55 | * xmlAllocParserInputBuffer: |
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56 | * @enc: the charset encoding if known |
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57 | * |
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58 | * Create a buffered parser input for progressive parsing |
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59 | * |
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60 | * Returns the new parser input or NULL |
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61 | */ |
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62 | xmlParserInputBufferPtr |
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63 | xmlAllocParserInputBuffer(xmlCharEncoding enc) { |
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64 | xmlParserInputBufferPtr ret; |
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65 | |
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66 | ret = (xmlParserInputBufferPtr) xmlMalloc(sizeof(xmlParserInputBuffer)); |
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67 | if (ret == NULL) { |
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68 | fprintf(stderr, "xmlAllocParserInputBuffer : out of memory!\n"); |
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69 | return(NULL); |
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70 | } |
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71 | memset(ret, 0, (size_t) sizeof(xmlParserInputBuffer)); |
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72 | ret->buffer = xmlBufferCreate(); |
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73 | if (ret->buffer == NULL) { |
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74 | xmlFree(ret); |
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75 | return(NULL); |
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76 | } |
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77 | ret->buffer->alloc = XML_BUFFER_ALLOC_DOUBLEIT; |
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78 | ret->encoder = xmlGetCharEncodingHandler(enc); |
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79 | ret->fd = -1; |
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80 | ret->httpIO = NULL; |
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81 | ret->ftpIO = NULL; |
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82 | /* 2.3.5 */ |
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83 | ret->raw = NULL; |
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84 | |
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85 | return(ret); |
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86 | } |
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87 | |
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88 | /** |
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89 | * xmlFreeParserInputBuffer: |
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90 | * @in: a buffered parser input |
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91 | * |
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92 | * Free up the memory used by a buffered parser input |
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93 | */ |
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94 | void |
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95 | xmlFreeParserInputBuffer(xmlParserInputBufferPtr in) { |
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96 | if (in->buffer != NULL) { |
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97 | xmlBufferFree(in->buffer); |
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98 | in->buffer = NULL; |
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99 | } |
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100 | #ifdef HAVE_ZLIB_H |
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101 | if (in->gzfile != NULL) |
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102 | gzclose(in->gzfile); |
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103 | #endif |
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104 | if (in->httpIO != NULL) |
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105 | xmlNanoHTTPClose(in->httpIO); |
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106 | if (in->ftpIO != NULL) |
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107 | xmlNanoFTPClose(in->ftpIO); |
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108 | if (in->fd >= 0) |
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109 | close(in->fd); |
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110 | /* 2.3.5 */ |
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111 | if (in->raw) { |
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112 | xmlBufferFree(in->raw); |
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113 | in->raw = NULL; |
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114 | } |
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115 | memset(in, 0xbe, (size_t) sizeof(xmlParserInputBuffer)); |
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116 | xmlFree(in); |
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117 | } |
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118 | |
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119 | /** |
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120 | * xmlParserInputBufferCreateFilename: |
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121 | * @filename: a C string containing the filename |
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122 | * @enc: the charset encoding if known |
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123 | * |
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124 | * Create a buffered parser input for the progressive parsing of a file |
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125 | * If filename is "-' then we use stdin as the input. |
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126 | * Automatic support for ZLIB/Compress compressed document is provided |
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127 | * by default if found at compile-time. |
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128 | * |
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129 | * Returns the new parser input or NULL |
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130 | */ |
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131 | xmlParserInputBufferPtr |
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132 | xmlParserInputBufferCreateFilename(const char *filename, xmlCharEncoding enc) { |
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133 | xmlParserInputBufferPtr ret; |
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134 | #ifdef HAVE_ZLIB_H |
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135 | gzFile input = 0; |
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136 | #else |
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137 | int input = -1; |
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138 | #endif |
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139 | void *httpIO = NULL; |
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140 | void *ftpIO = NULL; |
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141 | |
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142 | if (filename == NULL) return(NULL); |
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143 | |
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144 | if (!strncmp(filename, "http://", 7)) { |
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145 | httpIO = xmlNanoHTTPOpen(filename, NULL); |
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146 | if (httpIO == NULL) { |
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147 | #ifdef VERBOSE_FAILURE |
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148 | fprintf (stderr, "Cannot read URL %s\n", filename); |
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149 | perror ("xmlNanoHTTPOpen failed"); |
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150 | #endif |
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151 | return(NULL); |
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152 | } |
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153 | } else if (!strncmp(filename, "ftp://", 6)) { |
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154 | ftpIO = xmlNanoFTPOpen(filename); |
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155 | if (ftpIO == NULL) { |
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156 | #ifdef VERBOSE_FAILURE |
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157 | fprintf (stderr, "Cannot read URL %s\n", filename); |
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158 | perror ("xmlNanoFTPOpen failed"); |
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159 | #endif |
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160 | return(NULL); |
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161 | } |
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162 | } else if (!strcmp(filename, "-")) { |
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163 | #ifdef HAVE_ZLIB_H |
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164 | input = gzdopen (fileno(stdin), "r"); |
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165 | if (input == NULL) { |
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166 | #ifdef VERBOSE_FAILURE |
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167 | fprintf (stderr, "Cannot read from stdin\n"); |
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168 | perror ("gzdopen failed"); |
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169 | #endif |
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170 | return(NULL); |
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171 | } |
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172 | #else |
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173 | #ifdef WIN32 |
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174 | input = -1; |
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175 | #else |
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176 | input = fileno(stdin); |
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177 | #endif |
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178 | if (input < 0) { |
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179 | #ifdef VERBOSE_FAILURE |
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180 | fprintf (stderr, "Cannot read from stdin\n"); |
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181 | perror ("open failed"); |
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182 | #endif |
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183 | return(NULL); |
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184 | } |
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185 | #endif |
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186 | } else { |
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187 | #ifdef HAVE_ZLIB_H |
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188 | input = gzopen (filename, "r"); |
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189 | if (input == NULL) { |
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190 | #ifdef VERBOSE_FAILURE |
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191 | fprintf (stderr, "Cannot read file %s :\n", filename); |
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192 | perror ("gzopen failed"); |
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193 | #endif |
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194 | return(NULL); |
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195 | } |
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196 | #else |
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197 | #ifdef WIN32 |
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198 | input = _open (filename, O_RDONLY | _O_BINARY); |
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199 | #else |
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200 | input = open (filename, O_RDONLY); |
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201 | #endif |
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202 | if (input < 0) { |
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203 | #ifdef VERBOSE_FAILURE |
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204 | fprintf (stderr, "Cannot read file %s :\n", filename); |
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205 | perror ("open failed"); |
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206 | #endif |
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207 | return(NULL); |
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208 | } |
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209 | #endif |
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210 | } |
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211 | /* |
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212 | * TODO : get the 4 first bytes and decode the charset |
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213 | * if enc == XML_CHAR_ENCODING_NONE |
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214 | * plug some encoding conversion routines here. !!! |
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215 | * enc = xmlDetectCharEncoding(buffer); |
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216 | */ |
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217 | |
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218 | ret = xmlAllocParserInputBuffer(enc); |
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219 | if (ret != NULL) { |
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220 | #ifdef HAVE_ZLIB_H |
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221 | ret->gzfile = input; |
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222 | #else |
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223 | ret->fd = input; |
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224 | #endif |
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225 | ret->httpIO = httpIO; |
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226 | ret->ftpIO = ftpIO; |
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227 | } |
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228 | xmlParserInputBufferRead(ret, 4); |
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229 | |
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230 | return(ret); |
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231 | } |
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232 | |
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233 | /** |
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234 | * xmlParserInputBufferCreateFile: |
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235 | * @file: a FILE* |
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236 | * @enc: the charset encoding if known |
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237 | * |
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238 | * Create a buffered parser input for the progressive parsing of a FILE * |
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239 | * buffered C I/O |
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240 | * |
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241 | * Returns the new parser input or NULL |
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242 | */ |
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243 | xmlParserInputBufferPtr |
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244 | xmlParserInputBufferCreateFile(FILE *file, xmlCharEncoding enc) { |
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245 | xmlParserInputBufferPtr ret; |
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246 | |
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247 | if (file == NULL) return(NULL); |
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248 | |
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249 | ret = xmlAllocParserInputBuffer(enc); |
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250 | if (ret != NULL) |
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251 | ret->file = file; |
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252 | |
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253 | return(ret); |
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254 | } |
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255 | |
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256 | /** |
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257 | * xmlParserInputBufferCreateFd: |
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258 | * @fd: a file descriptor number |
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259 | * @enc: the charset encoding if known |
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260 | * |
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261 | * Create a buffered parser input for the progressive parsing for the input |
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262 | * from a file descriptor |
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263 | * |
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264 | * Returns the new parser input or NULL |
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265 | */ |
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266 | xmlParserInputBufferPtr |
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267 | xmlParserInputBufferCreateFd(int fd, xmlCharEncoding enc) { |
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268 | xmlParserInputBufferPtr ret; |
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269 | |
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270 | if (fd < 0) return(NULL); |
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271 | |
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272 | ret = xmlAllocParserInputBuffer(enc); |
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273 | if (ret != NULL) |
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274 | ret->fd = fd; |
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275 | |
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276 | return(ret); |
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277 | } |
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278 | |
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279 | /** |
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280 | * xmlParserInputBufferPush: |
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281 | * @in: a buffered parser input |
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282 | * @buf: an char array |
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283 | * @len: the size in bytes of the array. |
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284 | * |
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285 | * Push the content of the arry in the input buffer |
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286 | * This routine handle the I18N transcoding to internal UTF-8 |
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287 | * This is used when operating the parser in progressive (push) mode. |
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288 | * |
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289 | * Returns the number of chars read and stored in the buffer, or -1 |
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290 | * in case of error. |
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291 | */ |
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292 | int |
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293 | xmlParserInputBufferPush(xmlParserInputBufferPtr in, int len, const char *buf) { |
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294 | int nbchars = 0; |
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295 | |
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296 | if (len < 0) return(0); |
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297 | if (in->encoder != NULL) { |
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298 | xmlChar *buffer; |
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299 | |
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300 | buffer = (xmlChar *) xmlMalloc((len + 1) * 2 * sizeof(xmlChar)); |
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301 | if (buffer == NULL) { |
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302 | fprintf(stderr, "xmlParserInputBufferGrow : out of memory !\n"); |
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303 | xmlFree(buffer); |
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304 | return(-1); |
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305 | } |
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306 | nbchars = in->encoder->input(buffer, (len + 1) * 2 * sizeof(xmlChar), |
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307 | (xmlChar *) buf, len); |
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308 | /* |
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309 | * TODO : we really need to have something atomic or the |
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310 | * encoder must report the number of bytes read |
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311 | */ |
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312 | buffer[nbchars] = 0; |
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313 | xmlBufferAdd(in->buffer, (xmlChar *) buffer, nbchars); |
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314 | xmlFree(buffer); |
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315 | } else { |
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316 | nbchars = len; |
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317 | xmlBufferAdd(in->buffer, (xmlChar *) buf, nbchars); |
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318 | } |
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319 | #ifdef DEBUG_INPUT |
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320 | fprintf(stderr, "I/O: pushed %d chars, buffer %d/%d\n", |
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321 | nbchars, in->buffer->use, in->buffer->size); |
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322 | #endif |
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323 | return(nbchars); |
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324 | } |
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325 | |
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326 | /** |
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327 | * xmlParserInputBufferGrow: |
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328 | * @in: a buffered parser input |
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329 | * @len: indicative value of the amount of chars to read |
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330 | * |
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331 | * Grow up the content of the input buffer, the old data are preserved |
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332 | * This routine handle the I18N transcoding to internal UTF-8 |
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333 | * This routine is used when operating the parser in normal (pull) mode |
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334 | * TODO: one should be able to remove one extra copy |
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335 | * |
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336 | * Returns the number of chars read and stored in the buffer, or -1 |
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337 | * in case of error. |
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338 | */ |
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339 | int |
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340 | xmlParserInputBufferGrow(xmlParserInputBufferPtr in, int len) { |
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341 | char *buffer = NULL; |
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342 | #ifdef HAVE_ZLIB_H |
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343 | gzFile input = (gzFile) in->gzfile; |
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344 | #endif |
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345 | int res = 0; |
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346 | int nbchars = 0; |
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347 | int buffree; |
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348 | |
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349 | if ((len <= MINLEN) && (len != 4)) |
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350 | len = MINLEN; |
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351 | buffree = in->buffer->size - in->buffer->use; |
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352 | if (buffree <= 0) { |
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353 | fprintf(stderr, "xmlParserInputBufferGrow : buffer full !\n"); |
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354 | return(0); |
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355 | } |
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356 | if (len > buffree) |
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357 | len = buffree; |
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358 | |
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359 | buffer = xmlMalloc((len + 1) * sizeof(char)); |
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360 | if (buffer == NULL) { |
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361 | fprintf(stderr, "xmlParserInputBufferGrow : out of memory !\n"); |
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362 | return(-1); |
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363 | } |
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364 | if (in->httpIO != NULL) { |
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365 | res = xmlNanoHTTPRead(in->httpIO, &buffer[0], len); |
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366 | } else if (in->ftpIO != NULL) { |
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367 | res = xmlNanoFTPRead(in->ftpIO, &buffer[0], len); |
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368 | } else if (in->file != NULL) { |
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369 | res = fread(&buffer[0], 1, len, in->file); |
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370 | #ifdef HAVE_ZLIB_H |
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371 | } else if (in->gzfile != NULL) { |
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372 | res = gzread(input, &buffer[0], len); |
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373 | #endif |
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374 | } else if (in->fd >= 0) { |
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375 | res = read(in->fd, &buffer[0], len); |
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376 | } else { |
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377 | fprintf(stderr, "xmlParserInputBufferGrow : no input !\n"); |
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378 | xmlFree(buffer); |
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379 | return(-1); |
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380 | } |
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381 | if (res == 0) { |
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382 | xmlFree(buffer); |
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383 | return(0); |
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384 | } |
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385 | if (res < 0) { |
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386 | perror ("read error"); |
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387 | xmlFree(buffer); |
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388 | return(-1); |
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389 | } |
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390 | if (in->encoder != NULL) { |
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391 | xmlChar *buf; |
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392 | |
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393 | buf = (xmlChar *) xmlMalloc((res + 1) * 2 * sizeof(xmlChar)); |
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394 | if (buf == NULL) { |
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395 | fprintf(stderr, "xmlParserInputBufferGrow : out of memory !\n"); |
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396 | xmlFree(buffer); |
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397 | return(-1); |
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398 | } |
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399 | nbchars = in->encoder->input(buf, (res + 1) * 2 * sizeof(xmlChar), |
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400 | BAD_CAST buffer, res); |
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401 | buf[nbchars] = 0; |
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402 | xmlBufferAdd(in->buffer, (xmlChar *) buf, nbchars); |
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403 | xmlFree(buf); |
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404 | } else { |
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405 | nbchars = res; |
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406 | buffer[nbchars] = 0; |
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407 | xmlBufferAdd(in->buffer, (xmlChar *) buffer, nbchars); |
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408 | } |
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409 | #ifdef DEBUG_INPUT |
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410 | fprintf(stderr, "I/O: read %d chars, buffer %d/%d\n", |
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411 | nbchars, in->buffer->use, in->buffer->size); |
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412 | #endif |
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413 | xmlFree(buffer); |
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414 | return(nbchars); |
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415 | } |
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416 | |
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417 | /** |
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418 | * xmlParserInputBufferRead: |
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419 | * @in: a buffered parser input |
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420 | * @len: indicative value of the amount of chars to read |
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421 | * |
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422 | * Refresh the content of the input buffer, the old data are considered |
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423 | * consumed |
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424 | * This routine handle the I18N transcoding to internal UTF-8 |
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425 | * |
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426 | * Returns the number of chars read and stored in the buffer, or -1 |
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427 | * in case of error. |
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428 | */ |
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429 | int |
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430 | xmlParserInputBufferRead(xmlParserInputBufferPtr in, int len) { |
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431 | /* xmlBufferEmpty(in->buffer); */ |
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432 | if ((in->httpIO != NULL) || (in->ftpIO != NULL) || (in->file != NULL) || |
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433 | #ifdef HAVE_ZLIB_H |
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434 | (in->gzfile != NULL) || |
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435 | #endif |
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436 | (in->fd >= 0)) |
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437 | return(xmlParserInputBufferGrow(in, len)); |
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438 | else |
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439 | return(0); |
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440 | } |
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441 | |
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442 | /* |
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443 | * xmlParserGetDirectory: |
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444 | * @filename: the path to a file |
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445 | * |
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446 | * lookup the directory for that file |
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447 | * |
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448 | * Returns a new allocated string containing the directory, or NULL. |
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449 | */ |
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450 | char * |
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451 | xmlParserGetDirectory(const char *filename) { |
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452 | char *ret = NULL; |
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453 | char dir[1024]; |
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454 | char *cur; |
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455 | char sep = '/'; |
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456 | |
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457 | if (filename == NULL) return(NULL); |
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458 | #ifdef WIN32 |
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459 | sep = '\\'; |
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460 | #endif |
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461 | |
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462 | strncpy(dir, filename, 1023); |
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463 | dir[1023] = 0; |
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464 | cur = &dir[strlen(dir)]; |
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465 | while (cur > dir) { |
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466 | if (*cur == sep) break; |
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467 | cur --; |
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468 | } |
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469 | if (*cur == sep) { |
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470 | if (cur == dir) dir[1] = 0; |
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471 | else *cur = 0; |
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472 | ret = xmlMemStrdup(dir); |
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473 | } else { |
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474 | if (getcwd(dir, 1024) != NULL) { |
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475 | dir[1023] = 0; |
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476 | ret = xmlMemStrdup(dir); |
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477 | } |
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478 | } |
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479 | return(ret); |
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480 | } |
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481 | |
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482 | /**************************************************************** |
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483 | * * |
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484 | * External entities loading * |
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485 | * * |
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486 | ****************************************************************/ |
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487 | |
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488 | /* |
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489 | * xmlDefaultExternalEntityLoader: |
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490 | * @URL: the URL for the entity to load |
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491 | * @ID: the System ID for the entity to load |
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492 | * @ctxt: the context in which the entity is called or NULL |
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493 | * |
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494 | * By default we don't load external entitites, yet. |
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495 | * |
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496 | * Returns a new allocated xmlParserInputPtr, or NULL. |
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497 | */ |
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498 | static |
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499 | xmlParserInputPtr |
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500 | xmlDefaultExternalEntityLoader(const char *URL, const char *ID, |
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501 | xmlParserCtxtPtr ctxt) { |
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502 | xmlParserInputPtr ret = NULL; |
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503 | #ifdef DEBUG_EXTERNAL_ENTITIES |
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504 | fprintf(stderr, "xmlDefaultExternalEntityLoader(%s, xxx)\n", URL); |
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505 | #endif |
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506 | if (URL == NULL) { |
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507 | if ((ctxt->sax != NULL) && (ctxt->sax->warning != NULL)) |
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508 | ctxt->sax->warning(ctxt, "failed to load external entity \"%s\"\n", |
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509 | ID); |
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510 | return(NULL); |
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511 | } |
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512 | ret = xmlNewInputFromFile(ctxt, URL); |
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513 | if (ret == NULL) { |
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514 | if ((ctxt->sax != NULL) && (ctxt->sax->warning != NULL)) |
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515 | ctxt->sax->warning(ctxt, "failed to load external entity \"%s\"\n", |
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516 | URL); |
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517 | } |
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518 | return(ret); |
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519 | } |
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520 | |
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521 | static xmlExternalEntityLoader xmlCurrentExternalEntityLoader = |
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522 | xmlDefaultExternalEntityLoader; |
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523 | |
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524 | /* |
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525 | * xmlSetExternalEntityLoader: |
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526 | * @f: the new entity resolver function |
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527 | * |
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528 | * Changes the defaultexternal entity resolver function for the application |
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529 | */ |
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530 | void |
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531 | xmlSetExternalEntityLoader(xmlExternalEntityLoader f) { |
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532 | xmlCurrentExternalEntityLoader = f; |
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533 | } |
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534 | |
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535 | /* |
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536 | * xmlGetExternalEntityLoader: |
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537 | * |
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538 | * Get the default external entity resolver function for the application |
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539 | * |
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540 | * Returns the xmlExternalEntityLoader function pointer |
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541 | */ |
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542 | xmlExternalEntityLoader |
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543 | xmlGetExternalEntityLoader(void) { |
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544 | return(xmlCurrentExternalEntityLoader); |
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545 | } |
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546 | |
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547 | /* |
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548 | * xmlLoadExternalEntity: |
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549 | * @URL: the URL for the entity to load |
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550 | * @ID: the System ID for the entity to load |
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551 | * @ctxt: the context in which the entity is called or NULL |
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552 | * |
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553 | * Load an external entity, note that the use of this function for |
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554 | * unparsed entities may generate problems |
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555 | * TODO: a more generic External entitiy API must be designed |
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556 | * |
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557 | * Returns the xmlParserInputPtr or NULL |
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558 | */ |
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559 | xmlParserInputPtr |
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560 | xmlLoadExternalEntity(const char *URL, const char *ID, |
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561 | xmlParserCtxtPtr ctxt) { |
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562 | return(xmlCurrentExternalEntityLoader(URL, ID, ctxt)); |
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563 | } |
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564 | |
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