diff options
Diffstat (limited to 'gs/libpng/pngread.c')
-rw-r--r-- | gs/libpng/pngread.c | 750 |
1 files changed, 750 insertions, 0 deletions
diff --git a/gs/libpng/pngread.c b/gs/libpng/pngread.c new file mode 100644 index 000000000..294ad6156 --- /dev/null +++ b/gs/libpng/pngread.c @@ -0,0 +1,750 @@ + +/* pngread.c - read a PNG file + + libpng 1.0 beta 6 - version 0.96 + 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 + May 12, 1997 + */ + +#define PNG_INTERNAL +#include "png.h" + +/* Create a PNG structure for reading, and allocate any memory needed. */ +png_structp +png_create_read_struct(png_charp user_png_ver, png_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_malloc(png_ptr, 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_malloc(png_ptr, 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"); + } + } + + while (1) + { + 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_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(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); +} + +/* 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 + 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_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) + { + png_destroy_struct((png_voidp)info_ptr); + *info_ptr_ptr = (png_infop)NULL; + } + + if (end_info_ptr != NULL) + { + 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) +{ + int i; + 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_free(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) + { + 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) + { + 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) + { + 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)); +} |