/* SPDX-License-Identifier: GPL-2.0-only */ /* * Provide a simple API around the Wuffs JPEG decoder * Uses the heap (and lots of it) for the image-size specific * work buffer, so ramstage-only. */ #include <stdint.h> #include "jpeg.h" #define WUFFS_CONFIG__AVOID_CPU_ARCH #define WUFFS_CONFIG__MODULES #define WUFFS_CONFIG__MODULE__BASE #define WUFFS_CONFIG__MODULE__JPEG #define WUFFS_CONFIG__STATIC_FUNCTIONS #define WUFFS_IMPLEMENTATION #include "../vendorcode/wuffs/wuffs-v0.4.c" /* ~16K is big enough to move this off the stack */ static wuffs_jpeg__decoder dec; int jpeg_fetch_size(unsigned char *filedata, size_t filesize, unsigned int *width, unsigned int *height) { if (!width || !height) { return JPEG_DECODE_FAILED; } wuffs_base__status status = wuffs_jpeg__decoder__initialize( &dec, sizeof(dec), WUFFS_VERSION, WUFFS_INITIALIZE__DEFAULT_OPTIONS); if (status.repr) { return JPEG_DECODE_FAILED; } wuffs_base__image_config imgcfg; wuffs_base__io_buffer src = wuffs_base__ptr_u8__reader(filedata, filesize, true); status = wuffs_jpeg__decoder__decode_image_config(&dec, &imgcfg, &src); if (status.repr) { return JPEG_DECODE_FAILED; } *width = wuffs_base__pixel_config__width(&imgcfg.pixcfg); *height = wuffs_base__pixel_config__height(&imgcfg.pixcfg); return 0; } int jpeg_decode(unsigned char *filedata, size_t filesize, unsigned char *pic, unsigned int width, unsigned int height, unsigned int bytes_per_line, unsigned int depth) { if (!filedata || !pic) { return JPEG_DECODE_FAILED; } /* Relatively arbitrary limit that shouldn't hurt anybody. * 300M (10k*10k*3bytes/pixel) is already larger than our heap, so * it's on the safe side. * This avoids overflows when width or height are used for * calculations in this function. */ if ((width > 10000) || (height > 10000)) { return JPEG_DECODE_FAILED; } uint32_t pixfmt; switch (depth) { case 16: pixfmt = WUFFS_BASE__PIXEL_FORMAT__BGR_565; break; case 24: pixfmt = WUFFS_BASE__PIXEL_FORMAT__BGR; break; case 32: pixfmt = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL; break; default: return JPEG_DECODE_FAILED; } wuffs_base__status status = wuffs_jpeg__decoder__initialize( &dec, sizeof(dec), WUFFS_VERSION, WUFFS_INITIALIZE__DEFAULT_OPTIONS); if (status.repr) { return JPEG_DECODE_FAILED; } wuffs_base__image_config imgcfg; wuffs_base__io_buffer src = wuffs_base__ptr_u8__reader(filedata, filesize, true); status = wuffs_jpeg__decoder__decode_image_config(&dec, &imgcfg, &src); if (status.repr) { return JPEG_DECODE_FAILED; } wuffs_base__pixel_config pixcfg; wuffs_base__pixel_config__set(&pixcfg, pixfmt, 0, width, height); wuffs_base__pixel_buffer pixbuf; status = wuffs_base__pixel_buffer__set_interleaved( &pixbuf, &pixcfg, wuffs_base__make_table_u8(pic, width * (depth / 8), height, bytes_per_line), wuffs_base__empty_slice_u8()); if (status.repr) { return JPEG_DECODE_FAILED; } uint64_t workbuf_len_min_incl = wuffs_jpeg__decoder__workbuf_len(&dec).min_incl; uint8_t *workbuf_array = malloc(workbuf_len_min_incl); if ((workbuf_array == NULL) && workbuf_len_min_incl) { return JPEG_DECODE_FAILED; } wuffs_base__slice_u8 workbuf = wuffs_base__make_slice_u8(workbuf_array, workbuf_len_min_incl); status = wuffs_jpeg__decoder__decode_frame(&dec, &pixbuf, &src, WUFFS_BASE__PIXEL_BLEND__SRC, workbuf, NULL); free(workbuf_array); if (status.repr) { return JPEG_DECODE_FAILED; } return 0; }