| |
| /* pngread.c - read a PNG file |
| * |
| * libpng 1.00 |
| * For conditions of distribution and use, see copyright notice in png.h |
| * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| * Copyright (c) 1996, 1997 Andreas Dilger |
| * Copyright (c) 1998, Glenn Randers-Pehrson |
| * March 7, 1998 |
| * |
| * This file contains routines that an application calls directly to |
| * read a PNG file or stream. |
| */ |
| |
| #define PNG_INTERNAL |
| #include "png.h" |
| |
| /* Create a PNG structure for reading, and allocate any memory needed. */ |
| png_structp |
| png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn) |
| { |
| png_structp png_ptr; |
| #ifdef USE_FAR_KEYWORD |
| jmp_buf jmpbuf; |
| #endif |
| png_debug(1, "in png_create_read_struct\n"); |
| if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) |
| { |
| return (png_structp)NULL; |
| } |
| #ifdef USE_FAR_KEYWORD |
| if (setjmp(jmpbuf)) |
| #else |
| if (setjmp(png_ptr->jmpbuf)) |
| #endif |
| { |
| png_free(png_ptr, png_ptr->zbuf); |
| png_destroy_struct(png_ptr); |
| return (png_structp)NULL; |
| } |
| #ifdef USE_FAR_KEYWORD |
| png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
| #endif |
| png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
| |
| /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
| * we must recompile any applications that use any older library version. |
| * For versions after libpng 1.0, we will be compatible, so we need |
| * only check the first digit. |
| */ |
| if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
| (user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
| { |
| png_error(png_ptr, |
| "Incompatible libpng version in application and library"); |
| } |
| |
| /* initialize zbuf - compression buffer */ |
| png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| (png_uint_32)png_ptr->zbuf_size); |
| png_ptr->zstream.zalloc = png_zalloc; |
| png_ptr->zstream.zfree = png_zfree; |
| png_ptr->zstream.opaque = (voidpf)png_ptr; |
| |
| switch (inflateInit(&png_ptr->zstream)) |
| { |
| case Z_OK: /* Do nothing */ break; |
| case Z_MEM_ERROR: |
| case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
| case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; |
| default: png_error(png_ptr, "Unknown zlib error"); |
| } |
| |
| png_ptr->zstream.next_out = png_ptr->zbuf; |
| png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| |
| png_set_read_fn(png_ptr, NULL, NULL); |
| |
| return (png_ptr); |
| } |
| |
| /* Initialize PNG structure for reading, and allocate any memory needed. |
| This interface is depreciated in favour of the png_create_read_struct(), |
| and it will eventually disappear. */ |
| void |
| png_read_init(png_structp png_ptr) |
| { |
| jmp_buf tmp_jmp; /* to save current jump buffer */ |
| |
| png_debug(1, "in png_read_init\n"); |
| /* save jump buffer and error functions */ |
| png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
| |
| /* reset all variables to 0 */ |
| png_memset(png_ptr, 0, sizeof (png_struct)); |
| |
| /* restore jump buffer */ |
| png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
| |
| /* initialize zbuf - compression buffer */ |
| png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| (png_uint_32)png_ptr->zbuf_size); |
| png_ptr->zstream.zalloc = png_zalloc; |
| png_ptr->zstream.zfree = png_zfree; |
| png_ptr->zstream.opaque = (voidpf)png_ptr; |
| |
| switch (inflateInit(&png_ptr->zstream)) |
| { |
| case Z_OK: /* Do nothing */ break; |
| case Z_MEM_ERROR: |
| case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; |
| case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; |
| default: png_error(png_ptr, "Unknown zlib error"); |
| } |
| |
| png_ptr->zstream.next_out = png_ptr->zbuf; |
| png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| |
| png_set_read_fn(png_ptr, NULL, NULL); |
| } |
| |
| /* Read the information before the actual image data. This has been |
| * changed in v0.90 to allow reading a file which already has the magic |
| * bytes read from the stream. You can tell libpng how many bytes have |
| * been read from the beginning of the stream (up to the maxumum of 8) |
| * via png_set_sig_bytes(), and we will only check the remaining bytes |
| * here. The application can then have access to the signature bytes we |
| * read if it is determined that this isn't a valid PNG file. |
| */ |
| void |
| png_read_info(png_structp png_ptr, png_infop info_ptr) |
| { |
| png_debug(1, "in png_read_info\n"); |
| /* save jump buffer and error functions */ |
| /* If we haven't checked all of the PNG signature bytes, do so now. */ |
| if (png_ptr->sig_bytes < 8) |
| { |
| png_size_t num_checked = png_ptr->sig_bytes, |
| num_to_check = 8 - num_checked; |
| |
| png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
| png_ptr->sig_bytes = 8; |
| |
| if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| { |
| if (num_checked < 4 && |
| png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| png_error(png_ptr, "Not a PNG file"); |
| else |
| png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| } |
| } |
| |
| for(;;) |
| { |
| png_byte chunk_length[4]; |
| png_uint_32 length; |
| |
| png_read_data(png_ptr, chunk_length, 4); |
| length = png_get_uint_32(chunk_length); |
| |
| png_reset_crc(png_ptr); |
| png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| |
| png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); |
| |
| /* This should be a binary subdivision search or a hash for |
| * matching the chunk name rather than a linear search. |
| */ |
| if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| png_handle_IHDR(png_ptr, info_ptr, length); |
| else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| png_handle_PLTE(png_ptr, info_ptr, length); |
| else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| png_handle_IEND(png_ptr, info_ptr, length); |
| else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| { |
| if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| png_error(png_ptr, "Missing IHDR before IDAT"); |
| else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| !(png_ptr->mode & PNG_HAVE_PLTE)) |
| png_error(png_ptr, "Missing PLTE before IDAT"); |
| |
| png_ptr->idat_size = length; |
| png_ptr->mode |= PNG_HAVE_IDAT; |
| break; |
| } |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| png_handle_bKGD(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_cHRM_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| png_handle_cHRM(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_gAMA_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| png_handle_gAMA(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| png_handle_hIST(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_oFFs_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| png_handle_oFFs(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| png_handle_pCAL(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| png_handle_pHYs(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_sBIT_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| png_handle_sBIT(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_sRGB_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| png_handle_sRGB(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tEXt_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| png_handle_tEXt(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tIME_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| png_handle_tIME(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tRNS_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| png_handle_tRNS(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_zTXt_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| png_handle_zTXt(png_ptr, info_ptr, length); |
| #endif |
| else |
| png_handle_unknown(png_ptr, info_ptr, length); |
| } |
| } |
| |
| /* optional call to update the users info_ptr structure */ |
| void |
| png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
| { |
| png_debug(1, "in png_read_update_info\n"); |
| /* save jump buffer and error functions */ |
| if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| png_read_start_row(png_ptr); |
| png_read_transform_info(png_ptr, info_ptr); |
| } |
| |
| /* Initialize palette, background, etc, after transformations |
| * are set, but before any reading takes place. This allows |
| * the user to obtail a gamma corrected palette, for example. |
| * If the user doesn't call this, we will do it ourselves. |
| */ |
| void |
| png_start_read_image(png_structp png_ptr) |
| { |
| png_debug(1, "in png_start_read_image\n"); |
| /* save jump buffer and error functions */ |
| if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| png_read_start_row(png_ptr); |
| } |
| |
| void |
| png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
| { |
| int ret; |
| png_debug2(1, "in png_read_row (row %d, pass %d)\n", |
| png_ptr->row_number, png_ptr->pass); |
| /* save jump buffer and error functions */ |
| if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| png_read_start_row(png_ptr); |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| /* if interlaced and we do not need a new row, combine row and return */ |
| if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| { |
| switch (png_ptr->pass) |
| { |
| case 0: |
| if (png_ptr->row_number & 7) |
| { |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 1: |
| if ((png_ptr->row_number & 7) || png_ptr->width < 5) |
| { |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 2: |
| if ((png_ptr->row_number & 7) != 4) |
| { |
| if (dsp_row != NULL && (png_ptr->row_number & 4)) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 3: |
| if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
| { |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 4: |
| if ((png_ptr->row_number & 3) != 2) |
| { |
| if (dsp_row != NULL && (png_ptr->row_number & 2)) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 5: |
| if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
| { |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| case 6: |
| if (!(png_ptr->row_number & 1)) |
| { |
| png_read_finish_row(png_ptr); |
| return; |
| } |
| break; |
| } |
| } |
| #endif |
| |
| if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| png_error(png_ptr, "Invalid attempt to read row data"); |
| |
| png_ptr->zstream.next_out = png_ptr->row_buf; |
| png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| do |
| { |
| if (!(png_ptr->zstream.avail_in)) |
| { |
| while (!png_ptr->idat_size) |
| { |
| png_byte chunk_length[4]; |
| |
| png_crc_finish(png_ptr, 0); |
| |
| png_read_data(png_ptr, chunk_length, 4); |
| png_ptr->idat_size = png_get_uint_32(chunk_length); |
| |
| png_reset_crc(png_ptr); |
| png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| png_error(png_ptr, "Not enough image data"); |
| } |
| png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| png_ptr->zstream.next_in = png_ptr->zbuf; |
| if (png_ptr->zbuf_size > png_ptr->idat_size) |
| png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
| png_crc_read(png_ptr, png_ptr->zbuf, |
| (png_size_t)png_ptr->zstream.avail_in); |
| png_ptr->idat_size -= png_ptr->zstream.avail_in; |
| } |
| ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| if (ret == Z_STREAM_END) |
| { |
| if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
| png_ptr->idat_size) |
| png_error(png_ptr, "Extra compressed data"); |
| png_ptr->mode |= PNG_AFTER_IDAT; |
| png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| break; |
| } |
| if (ret != Z_OK) |
| png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
| "Decompression error"); |
| |
| } while (png_ptr->zstream.avail_out); |
| |
| png_ptr->row_info.color_type = png_ptr->color_type; |
| png_ptr->row_info.width = png_ptr->iwidth; |
| png_ptr->row_info.channels = png_ptr->channels; |
| png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| { |
| png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * |
| (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); |
| } |
| |
| png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| (int)(png_ptr->row_buf[0])); |
| |
| png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| png_ptr->rowbytes + 1); |
| |
| if (png_ptr->transformations) |
| png_do_read_transformations(png_ptr); |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| /* blow up interlaced rows to full size */ |
| if (png_ptr->interlaced && |
| (png_ptr->transformations & PNG_INTERLACE)) |
| { |
| if (png_ptr->pass < 6) |
| png_do_read_interlace(&(png_ptr->row_info), |
| png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, |
| png_pass_dsp_mask[png_ptr->pass]); |
| if (row != NULL) |
| png_combine_row(png_ptr, row, |
| png_pass_mask[png_ptr->pass]); |
| } |
| else |
| #endif |
| { |
| if (row != NULL) |
| png_combine_row(png_ptr, row, 0xff); |
| if (dsp_row != NULL) |
| png_combine_row(png_ptr, dsp_row, 0xff); |
| } |
| png_read_finish_row(png_ptr); |
| |
| if (png_ptr->read_row_fn != NULL) |
| (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| } |
| |
| /* Read one or more rows of image data. If the image is interlaced, |
| * and png_set_interlace_handling() has been called, the rows need to |
| * contain the contents of the rows from the previous pass. If the |
| * image has alpha or transparency, and png_handle_alpha() has been |
| * called, the rows contents must be initialized to the contents of the |
| * screen. |
| * |
| * "row" holds the actual image, and pixels are placed in it |
| * as they arrive. If the image is displayed after each pass, it will |
| * appear to "sparkle" in. "display_row" can be used to display a |
| * "chunky" progressive image, with finer detail added as it becomes |
| * available. If you do not want this "chunky" display, you may pass |
| * NULL for display_row. If you do not want the sparkle display, and |
| * you have not called png_handle_alpha(), you may pass NULL for rows. |
| * If you have called png_handle_alpha(), and the image has either an |
| * alpha channel or a transparency chunk, you must provide a buffer for |
| * rows. In this case, you do not have to provide a display_row buffer |
| * also, but you may. If the image is not interlaced, or if you have |
| * not called png_set_interlace_handling(), the display_row buffer will |
| * be ignored, so pass NULL to it. |
| */ |
| |
| void |
| png_read_rows(png_structp png_ptr, png_bytepp row, |
| png_bytepp display_row, png_uint_32 num_rows) |
| { |
| png_uint_32 i; |
| png_bytepp rp; |
| png_bytepp dp; |
| |
| png_debug(1, "in png_read_rows\n"); |
| /* save jump buffer and error functions */ |
| rp = row; |
| dp = display_row; |
| for (i = 0; i < num_rows; i++) |
| { |
| png_bytep rptr; |
| png_bytep dptr; |
| |
| if (rp != NULL) |
| rptr = *rp; |
| else |
| rptr = NULL; |
| if (dp != NULL) |
| dptr = *dp; |
| else |
| dptr = NULL; |
| png_read_row(png_ptr, rptr, dptr); |
| if (row != NULL) |
| rp++; |
| if (display_row != NULL) |
| dp++; |
| } |
| } |
| |
| /* Read the entire image. If the image has an alpha channel or a tRNS |
| * chunk, and you have called png_handle_alpha(), you will need to |
| * initialize the image to the current image that PNG will be overlaying. |
| * We set the num_rows again here, in case it was incorrectly set in |
| * png_read_start_row() by a call to png_read_update_info() or |
| * png_start_read_image() if png_set_interlace_handling() wasn't called |
| * prior to either of these functions like it should have been. You can |
| * only call this function once. If you desire to have an image for |
| * each pass of a interlaced image, use png_read_rows() instead. |
| */ |
| void |
| png_read_image(png_structp png_ptr, png_bytepp image) |
| { |
| png_uint_32 i; |
| int pass, j; |
| png_bytepp rp; |
| |
| png_debug(1, "in png_read_image\n"); |
| /* save jump buffer and error functions */ |
| pass = png_set_interlace_handling(png_ptr); |
| |
| png_ptr->num_rows = png_ptr->height; /* Make sure this is set correctly */ |
| |
| for (j = 0; j < pass; j++) |
| { |
| rp = image; |
| for (i = 0; i < png_ptr->height; i++) |
| { |
| png_read_row(png_ptr, *rp, NULL); |
| rp++; |
| } |
| } |
| } |
| |
| /* Read the end of the PNG file. Will not read past the end of the |
| * file, will verify the end is accurate, and will read any comments |
| * or time information at the end of the file, if info is not NULL. |
| */ |
| void |
| png_read_end(png_structp png_ptr, png_infop info_ptr) |
| { |
| png_byte chunk_length[4]; |
| png_uint_32 length; |
| |
| png_debug(1, "in png_read_end\n"); |
| /* save jump buffer and error functions */ |
| png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
| |
| do |
| { |
| png_read_data(png_ptr, chunk_length, 4); |
| length = png_get_uint_32(chunk_length); |
| |
| png_reset_crc(png_ptr); |
| png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| |
| png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); |
| |
| if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| png_handle_IHDR(png_ptr, info_ptr, length); |
| else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| { |
| /* Zero length IDATs are legal after the last IDAT has been |
| * read, but not after other chunks have been read. |
| */ |
| if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) |
| png_error(png_ptr, "Too many IDAT's found"); |
| else |
| png_crc_finish(png_ptr, 0); |
| } |
| else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| png_handle_PLTE(png_ptr, info_ptr, length); |
| else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| png_handle_IEND(png_ptr, info_ptr, length); |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| png_handle_bKGD(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_cHRM_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| png_handle_cHRM(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_gAMA_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| png_handle_gAMA(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| png_handle_hIST(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_oFFs_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| png_handle_oFFs(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| png_handle_pCAL(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| png_handle_pHYs(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_sBIT_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| png_handle_sBIT(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_sRGB_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| png_handle_sRGB(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tEXt_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| png_handle_tEXt(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tIME_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| png_handle_tIME(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_tRNS_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| png_handle_tRNS(png_ptr, info_ptr, length); |
| #endif |
| #if defined(PNG_READ_zTXt_SUPPORTED) |
| else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| png_handle_zTXt(png_ptr, info_ptr, length); |
| #endif |
| else |
| png_handle_unknown(png_ptr, info_ptr, length); |
| } while (!(png_ptr->mode & PNG_HAVE_IEND)); |
| } |
| |
| /* free all memory used by the read */ |
| void |
| png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
| png_infopp end_info_ptr_ptr) |
| { |
| png_structp png_ptr = NULL; |
| png_infop info_ptr = NULL, end_info_ptr = NULL; |
| |
| png_debug(1, "in png_destroy_read_struct\n"); |
| /* save jump buffer and error functions */ |
| if (png_ptr_ptr != NULL) |
| png_ptr = *png_ptr_ptr; |
| |
| if (info_ptr_ptr != NULL) |
| info_ptr = *info_ptr_ptr; |
| |
| if (end_info_ptr_ptr != NULL) |
| end_info_ptr = *end_info_ptr_ptr; |
| |
| png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
| |
| if (info_ptr != NULL) |
| { |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| png_free(png_ptr, info_ptr->text); |
| #endif |
| png_destroy_struct((png_voidp)info_ptr); |
| *info_ptr_ptr = (png_infop)NULL; |
| } |
| |
| if (end_info_ptr != NULL) |
| { |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| png_free(png_ptr, end_info_ptr->text); |
| #endif |
| png_destroy_struct((png_voidp)end_info_ptr); |
| *end_info_ptr_ptr = (png_infop)NULL; |
| } |
| |
| if (png_ptr != NULL) |
| { |
| png_destroy_struct((png_voidp)png_ptr); |
| *png_ptr_ptr = (png_structp)NULL; |
| } |
| } |
| |
| /* free all memory used by the read (old method) */ |
| void |
| png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) |
| { |
| jmp_buf tmp_jmp; |
| png_error_ptr error_fn; |
| png_error_ptr warning_fn; |
| png_voidp error_ptr; |
| |
| png_debug(1, "in png_read_destroy\n"); |
| /* save jump buffer and error functions */ |
| if (info_ptr != NULL) |
| png_info_destroy(png_ptr, info_ptr); |
| |
| if (end_info_ptr != NULL) |
| png_info_destroy(png_ptr, end_info_ptr); |
| |
| png_free(png_ptr, png_ptr->zbuf); |
| png_free(png_ptr, png_ptr->row_buf); |
| png_free(png_ptr, png_ptr->prev_row); |
| #if defined(PNG_READ_DITHER_SUPPORTED) |
| png_free(png_ptr, png_ptr->palette_lookup); |
| png_free(png_ptr, png_ptr->dither_index); |
| #endif |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| png_free(png_ptr, png_ptr->gamma_table); |
| #endif |
| #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_free(png_ptr, png_ptr->gamma_from_1); |
| png_free(png_ptr, png_ptr->gamma_to_1); |
| #endif |
| if (png_ptr->flags & PNG_FLAG_FREE_PALETTE) |
| png_zfree(png_ptr, png_ptr->palette); |
| #if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_bKGD_SUPPORTED) |
| if (png_ptr->flags & PNG_FLAG_FREE_TRANS) |
| png_free(png_ptr, png_ptr->trans); |
| #endif |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
| png_free(png_ptr, png_ptr->hist); |
| #endif |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| if (png_ptr->gamma_16_table != NULL) |
| { |
| int i; |
| for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) |
| { |
| png_free(png_ptr, png_ptr->gamma_16_table[i]); |
| } |
| } |
| #endif |
| #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_free(png_ptr, png_ptr->gamma_16_table); |
| if (png_ptr->gamma_16_from_1 != NULL) |
| { |
| int i; |
| for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) |
| { |
| png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
| } |
| } |
| png_free(png_ptr, png_ptr->gamma_16_from_1); |
| if (png_ptr->gamma_16_to_1 != NULL) |
| { |
| int i; |
| for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) |
| { |
| png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
| } |
| } |
| png_free(png_ptr, png_ptr->gamma_16_to_1); |
| #endif |
| |
| inflateEnd(&png_ptr->zstream); |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| png_free(png_ptr, png_ptr->save_buffer); |
| #endif |
| |
| /* Save the important info out of the png_struct, in case it is |
| * being used again. |
| */ |
| png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
| |
| error_fn = png_ptr->error_fn; |
| warning_fn = png_ptr->warning_fn; |
| error_ptr = png_ptr->error_ptr; |
| |
| png_memset(png_ptr, 0, sizeof (png_struct)); |
| |
| png_ptr->error_fn = error_fn; |
| png_ptr->warning_fn = warning_fn; |
| png_ptr->error_ptr = error_ptr; |
| |
| png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
| } |
| |
| void |
| png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
| { |
| png_ptr->read_row_fn = read_row_fn; |
| } |
