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1 |
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2 #include "yaml_private.h" |
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3 |
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4 /* |
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5 * Declarations. |
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6 */ |
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7 |
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8 static int |
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9 yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem); |
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10 |
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11 YAML_DECLARE(int) |
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12 yaml_emitter_flush(yaml_emitter_t *emitter); |
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13 |
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14 /* |
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15 * Set the writer error and return 0. |
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16 */ |
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17 |
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18 static int |
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19 yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem) |
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20 { |
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21 emitter->error = YAML_WRITER_ERROR; |
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22 emitter->problem = problem; |
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23 |
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24 return 0; |
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25 } |
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26 |
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27 /* |
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28 * Flush the output buffer. |
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29 */ |
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30 |
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31 YAML_DECLARE(int) |
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32 yaml_emitter_flush(yaml_emitter_t *emitter) |
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33 { |
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34 int low, high; |
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35 |
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36 assert(emitter); /* Non-NULL emitter object is expected. */ |
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37 assert(emitter->write_handler); /* Write handler must be set. */ |
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38 assert(emitter->encoding); /* Output encoding must be set. */ |
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39 |
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40 emitter->buffer.last = emitter->buffer.pointer; |
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41 emitter->buffer.pointer = emitter->buffer.start; |
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42 |
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43 /* Check if the buffer is empty. */ |
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44 |
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45 if (emitter->buffer.start == emitter->buffer.last) { |
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46 return 1; |
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47 } |
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48 |
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49 /* If the output encoding is UTF-8, we don't need to recode the buffer. */ |
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50 |
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51 if (emitter->encoding == YAML_UTF8_ENCODING) |
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52 { |
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53 if (emitter->write_handler(emitter->write_handler_data, |
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54 emitter->buffer.start, |
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55 emitter->buffer.last - emitter->buffer.start)) { |
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56 emitter->buffer.last = emitter->buffer.start; |
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57 emitter->buffer.pointer = emitter->buffer.start; |
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58 return 1; |
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59 } |
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60 else { |
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61 return yaml_emitter_set_writer_error(emitter, "write error"); |
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62 } |
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63 } |
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64 |
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65 /* Recode the buffer into the raw buffer. */ |
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66 |
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67 low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); |
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68 high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); |
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69 |
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70 while (emitter->buffer.pointer != emitter->buffer.last) |
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71 { |
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72 unsigned char octet; |
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73 unsigned int width; |
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74 unsigned int value; |
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75 size_t k; |
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76 |
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77 /* |
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78 * See the "reader.c" code for more details on UTF-8 encoding. Note |
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79 * that we assume that the buffer contains a valid UTF-8 sequence. |
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80 */ |
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81 |
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82 /* Read the next UTF-8 character. */ |
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83 |
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84 octet = emitter->buffer.pointer[0]; |
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85 |
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86 width = (octet & 0x80) == 0x00 ? 1 : |
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87 (octet & 0xE0) == 0xC0 ? 2 : |
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88 (octet & 0xF0) == 0xE0 ? 3 : |
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89 (octet & 0xF8) == 0xF0 ? 4 : 0; |
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90 |
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91 value = (octet & 0x80) == 0x00 ? octet & 0x7F : |
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92 (octet & 0xE0) == 0xC0 ? octet & 0x1F : |
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93 (octet & 0xF0) == 0xE0 ? octet & 0x0F : |
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94 (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; |
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95 |
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96 for (k = 1; k < width; k ++) { |
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97 octet = emitter->buffer.pointer[k]; |
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98 value = (value << 6) + (octet & 0x3F); |
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99 } |
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100 |
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101 emitter->buffer.pointer += width; |
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102 |
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103 /* Write the character. */ |
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104 |
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105 if (value < 0x10000) |
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106 { |
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107 emitter->raw_buffer.last[high] = value >> 8; |
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108 emitter->raw_buffer.last[low] = value & 0xFF; |
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109 |
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110 emitter->raw_buffer.last += 2; |
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111 } |
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112 else |
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113 { |
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114 /* Write the character using a surrogate pair (check "reader.c"). */ |
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115 |
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116 value -= 0x10000; |
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117 emitter->raw_buffer.last[high] = 0xD8 + (value >> 18); |
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118 emitter->raw_buffer.last[low] = (value >> 10) & 0xFF; |
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119 emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF); |
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120 emitter->raw_buffer.last[low+2] = value & 0xFF; |
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121 |
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122 emitter->raw_buffer.last += 4; |
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123 } |
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124 } |
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125 |
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126 /* Write the raw buffer. */ |
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127 |
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128 if (emitter->write_handler(emitter->write_handler_data, |
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129 emitter->raw_buffer.start, |
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130 emitter->raw_buffer.last - emitter->raw_buffer.start)) { |
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131 emitter->buffer.last = emitter->buffer.start; |
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132 emitter->buffer.pointer = emitter->buffer.start; |
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133 emitter->raw_buffer.last = emitter->raw_buffer.start; |
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134 emitter->raw_buffer.pointer = emitter->raw_buffer.start; |
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135 return 1; |
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136 } |
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137 else { |
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138 return yaml_emitter_set_writer_error(emitter, "write error"); |
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139 } |
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140 } |
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141 |
