** Function name: jd_input (declared static) ** Description: Called by tjpgd.c to get more data ***************************************************************************************/
| 80 | ** Description: Called by tjpgd.c to get more data |
| 81 | ***************************************************************************************/ |
| 82 | unsigned int TJpg_Decoder::jd_input(JDEC *jdec, uint8_t *buf, unsigned int len) |
| 83 | { |
| 84 | TJpg_Decoder *thisPtr = TJpgDec.thisPtr; |
| 85 | jdec = jdec; // Supress warning |
| 86 | |
| 87 | // Handle an array input |
| 88 | if (thisPtr->jpg_source == TJPG_ARRAY) |
| 89 | { |
| 90 | // Avoid running off end of array |
| 91 | if (thisPtr->array_index + len > thisPtr->array_size) |
| 92 | { |
| 93 | len = thisPtr->array_size - thisPtr->array_index; |
| 94 | } |
| 95 | |
| 96 | // If buf is valid then copy len bytes to buffer |
| 97 | if (buf) |
| 98 | memcpy_P(buf, (const uint8_t *)(thisPtr->array_data + thisPtr->array_index), len); |
| 99 | |
| 100 | // Move pointer |
| 101 | thisPtr->array_index += len; |
| 102 | } |
| 103 | |
| 104 | #ifdef TJPGD_LOAD_FFS |
| 105 | // Handle SPIFFS input |
| 106 | else if (thisPtr->jpg_source == TJPG_FS_FILE) |
| 107 | { |
| 108 | // Check how many bytes are available |
| 109 | uint32_t bytesLeft = thisPtr->jpgFile.available(); |
| 110 | if (bytesLeft < len) |
| 111 | len = bytesLeft; |
| 112 | |
| 113 | if (buf) |
| 114 | { |
| 115 | // Read into buffer, pointer moved as well |
| 116 | thisPtr->jpgFile.read(buf, len); |
| 117 | } |
| 118 | else |
| 119 | { |
| 120 | // Buffer is null, so skip data by moving pointer |
| 121 | thisPtr->jpgFile.seek(thisPtr->jpgFile.position() + len); |
| 122 | } |
| 123 | } |
| 124 | #endif |
| 125 | |
| 126 | #if defined(TJPGD_LOAD_SD_LIBRARY) |
| 127 | // Handle SD library input |
| 128 | else if (thisPtr->jpg_source == TJPG_SD_FILE) |
| 129 | { |
| 130 | // Check how many bytes are available |
| 131 | uint32_t bytesLeft = thisPtr->jpgSdFile.available(); |
| 132 | if (bytesLeft < len) |
| 133 | len = bytesLeft; |
| 134 | |
| 135 | if (buf) |
| 136 | { |
| 137 | // Read into buffer, pointer moved as well |
| 138 | thisPtr->jpgSdFile.read(buf, len); |
| 139 | } |