/* Writes the end of the PNG file. If you don't want to write comments or * time information, you can pass NULL for info. If you already wrote these * in png_write_info(), do not write them again here. If you have long * comments, I suggest writing them here, and compressing them. */ void png_write_end(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_write_end\n"); if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "No IDATs written into file"); /* see if user wants us to write information chunks */ if (info_ptr != NULL) { #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) int i; /* local index variable */ #endif #if defined(PNG_WRITE_tIME_SUPPORTED) /* check to see if user has supplied a time chunk */ if (info_ptr->valid & PNG_INFO_tIME && !(png_ptr->flags & PNG_FLAG_WROTE_tIME)) png_write_tIME(png_ptr, &(info_ptr->mod_time)); #endif #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) /* loop through comment chunks */ for (i = 0; i < info_ptr->num_text; i++) { png_debug2(2, "Writing trailer text chunk %d, type %d\n", i, info_ptr->text[i].compression); if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) { #if defined(PNG_WRITE_zTXt_SUPPORTED) /* write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, info_ptr->text[i].text_length, info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text\n"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; } else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #if defined(PNG_WRITE_tEXt_SUPPORTED) /* write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, info_ptr->text[i].text_length); #else png_warning(png_ptr, "Unable to write uncompressed text\n"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } } #endif } png_ptr->mode |= PNG_AFTER_IDAT; /* write end of PNG file */ png_write_IEND(png_ptr); }
/* Writes the end of the PNG file. If you don't want to write comments or * time information, you can pass NULL for info. If you already wrote these * in png_write_info(), do not write them again here. If you have long * comments, I suggest writing them here, and compressing them. */ void PNGAPI png_write_end(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_write_end"); if (png_ptr == NULL) return; if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "No IDATs written into file"); #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED if (png_ptr->num_palette_max > png_ptr->num_palette) png_benign_error(png_ptr, "Wrote palette index exceeding num_palette"); #endif /* See if user wants us to write information chunks */ if (info_ptr != NULL) { #ifdef PNG_WRITE_TEXT_SUPPORTED int i; /* local index variable */ #endif #ifdef PNG_WRITE_tIME_SUPPORTED /* Check to see if user has supplied a time chunk */ if ((info_ptr->valid & PNG_INFO_tIME) && !(png_ptr->mode & PNG_WROTE_tIME)) png_write_tIME(png_ptr, &(info_ptr->mod_time)); #endif #ifdef PNG_WRITE_TEXT_SUPPORTED /* Loop through comment chunks */ for (i = 0; i < info_ptr->num_text; i++) { png_debug2(2, "Writing trailer text chunk %d, type %d", i, info_ptr->text[i].compression); /* An internationalized chunk? */ if (info_ptr->text[i].compression > 0) { #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write international chunk */ png_write_iTXt(png_ptr, info_ptr->text[i].compression, info_ptr->text[i].key, info_ptr->text[i].lang, info_ptr->text[i].lang_key, info_ptr->text[i].text); /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; #else png_warning(png_ptr, "Unable to write international text"); #endif } else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) { #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0, info_ptr->text[i].compression); /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; #else png_warning(png_ptr, "Unable to write compressed text"); #endif } else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, info_ptr->text[i].text, 0); /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; #else png_warning(png_ptr, "Unable to write uncompressed text"); #endif } } #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED if (info_ptr->unknown_chunks_num) { png_unknown_chunk *up; png_debug(5, "writing extra chunks"); for (up = info_ptr->unknown_chunks; up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; up++) { int keep = png_handle_as_unknown(png_ptr, up->name); if (keep != PNG_HANDLE_CHUNK_NEVER && up->location && (up->location & PNG_AFTER_IDAT) && ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) { png_write_chunk(png_ptr, up->name, up->data, up->size); } } } #endif } png_ptr->mode |= PNG_AFTER_IDAT; /* Write end of PNG file */ png_write_IEND(png_ptr); /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, * and restored again in libpng-1.2.30, may cause some applications that * do not set png_ptr->output_flush_fn to crash. If your application * experiences a problem, please try building libpng with * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to * png-mng-implement at lists.sf.net . */ #ifdef PNG_WRITE_FLUSH_SUPPORTED # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED png_flush(png_ptr); # endif #endif }