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Bump stb_image.h to 2.28.

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Bartosz Taudul 2023-01-31 22:55:18 +01:00
parent dfc458a8b2
commit cc5e97c88d
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2 changed files with 252 additions and 58 deletions
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profiler/src/stb_image.h
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@ -1,4 +1,4 @@
/* stb_image - v2.27 - public domain image loader - http://nothings.org/stb /* stb_image - v2.28 - public domain image loader - http://nothings.org/stb
no warranty implied; use at your own risk no warranty implied; use at your own risk
Do this: Do this:
@ -48,6 +48,7 @@ LICENSE
RECENT REVISION HISTORY: RECENT REVISION HISTORY:
2.28 (2023-01-29) many error fixes, security errors, just tons of stuff
2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes 2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes
2.26 (2020-07-13) many minor fixes 2.26 (2020-07-13) many minor fixes
2.25 (2020-02-02) fix warnings 2.25 (2020-02-02) fix warnings
@ -108,7 +109,7 @@ RECENT REVISION HISTORY:
Cass Everitt Ryamond Barbiero github:grim210 Cass Everitt Ryamond Barbiero github:grim210
Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw
Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus
Josh Tobin Matthew Gregan github:poppolopoppo Josh Tobin Neil Bickford Matthew Gregan github:poppolopoppo
Julian Raschke Gregory Mullen Christian Floisand github:darealshinji Julian Raschke Gregory Mullen Christian Floisand github:darealshinji
Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007 Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007
Brad Weinberger Matvey Cherevko github:mosra Brad Weinberger Matvey Cherevko github:mosra
@ -140,7 +141,7 @@ RECENT REVISION HISTORY:
// // ... x = width, y = height, n = # 8-bit components per pixel ... // // ... x = width, y = height, n = # 8-bit components per pixel ...
// // ... replace '0' with '1'..'4' to force that many components per pixel // // ... replace '0' with '1'..'4' to force that many components per pixel
// // ... but 'n' will always be the number that it would have been if you said 0 // // ... but 'n' will always be the number that it would have been if you said 0
// stbi_image_free(data) // stbi_image_free(data);
// //
// Standard parameters: // Standard parameters:
// int *x -- outputs image width in pixels // int *x -- outputs image width in pixels
@ -635,7 +636,7 @@ STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
#endif #endif
#endif #endif
#ifdef _MSC_VER #if defined(_MSC_VER) || defined(__SYMBIAN32__)
typedef unsigned short stbi__uint16; typedef unsigned short stbi__uint16;
typedef signed short stbi__int16; typedef signed short stbi__int16;
typedef unsigned int stbi__uint32; typedef unsigned int stbi__uint32;
@ -1032,7 +1033,7 @@ static int stbi__mad3sizes_valid(int a, int b, int c, int add)
} }
// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow // returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) #if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
{ {
return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
@ -1055,7 +1056,7 @@ static void *stbi__malloc_mad3(int a, int b, int c, int add)
return stbi__malloc(a*b*c + add); return stbi__malloc(a*b*c + add);
} }
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) #if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
{ {
if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
@ -1063,6 +1064,23 @@ static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
} }
#endif #endif
// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1 inclusive), 0 on overflow.
static int stbi__addints_valid(int a, int b)
{
if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow
if (a < 0 && b < 0) return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot overflow since b < 0.
return a <= INT_MAX - b;
}
// returns 1 if the product of two signed shorts is valid, 0 on overflow.
static int stbi__mul2shorts_valid(short a, short b)
{
if (b == 0 || b == -1) return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b doesn't overflow
if ((a >= 0) == (b >= 0)) return a <= SHRT_MAX/b; // product is positive, so similar to mul2sizes_valid
if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN
return a >= SHRT_MIN / b;
}
// stbi__err - error // stbi__err - error
// stbi__errpf - error returning pointer to float // stbi__errpf - error returning pointer to float
// stbi__errpuc - error returning pointer to unsigned char // stbi__errpuc - error returning pointer to unsigned char
@ -1985,9 +2003,12 @@ static int stbi__build_huffman(stbi__huffman *h, int *count)
int i,j,k=0; int i,j,k=0;
unsigned int code; unsigned int code;
// build size list for each symbol (from JPEG spec) // build size list for each symbol (from JPEG spec)
for (i=0; i < 16; ++i) for (i=0; i < 16; ++i) {
for (j=0; j < count[i]; ++j) for (j=0; j < count[i]; ++j) {
h->size[k++] = (stbi_uc) (i+1); h->size[k++] = (stbi_uc) (i+1);
if(k >= 257) return stbi__err("bad size list","Corrupt JPEG");
}
}
h->size[k] = 0; h->size[k] = 0;
// compute actual symbols (from jpeg spec) // compute actual symbols (from jpeg spec)
@ -2112,6 +2133,8 @@ stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
// convert the huffman code to the symbol id // convert the huffman code to the symbol id
c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
if(c < 0 || c >= 256) // symbol id out of bounds!
return -1;
STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
// convert the id to a symbol // convert the id to a symbol
@ -2130,6 +2153,7 @@ stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
unsigned int k; unsigned int k;
int sgn; int sgn;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j); if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative) sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative)
k = stbi_lrot(j->code_buffer, n); k = stbi_lrot(j->code_buffer, n);
@ -2144,6 +2168,7 @@ stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
{ {
unsigned int k; unsigned int k;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j); if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
k = stbi_lrot(j->code_buffer, n); k = stbi_lrot(j->code_buffer, n);
j->code_buffer = k & ~stbi__bmask[n]; j->code_buffer = k & ~stbi__bmask[n];
k &= stbi__bmask[n]; k &= stbi__bmask[n];
@ -2155,6 +2180,7 @@ stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
{ {
unsigned int k; unsigned int k;
if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing
k = j->code_buffer; k = j->code_buffer;
j->code_buffer <<= 1; j->code_buffer <<= 1;
--j->code_bits; --j->code_bits;
@ -2192,8 +2218,10 @@ static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman
memset(data,0,64*sizeof(data[0])); memset(data,0,64*sizeof(data[0]));
diff = t ? stbi__extend_receive(j, t) : 0; diff = t ? stbi__extend_receive(j, t) : 0;
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff; dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc; j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * dequant[0]); data[0] = (short) (dc * dequant[0]);
// decode AC components, see JPEG spec // decode AC components, see JPEG spec
@ -2207,6 +2235,7 @@ static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman
if (r) { // fast-AC path if (r) { // fast-AC path
k += (r >> 4) & 15; // run k += (r >> 4) & 15; // run
s = r & 15; // combined length s = r & 15; // combined length
if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
j->code_buffer <<= s; j->code_buffer <<= s;
j->code_bits -= s; j->code_bits -= s;
// decode into unzigzag'd location // decode into unzigzag'd location
@ -2246,8 +2275,10 @@ static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__
if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
diff = t ? stbi__extend_receive(j, t) : 0; diff = t ? stbi__extend_receive(j, t) : 0;
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff; dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc; j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * (1 << j->succ_low)); data[0] = (short) (dc * (1 << j->succ_low));
} else { } else {
// refinement scan for DC coefficient // refinement scan for DC coefficient
@ -2282,6 +2313,7 @@ static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__
if (r) { // fast-AC path if (r) { // fast-AC path
k += (r >> 4) & 15; // run k += (r >> 4) & 15; // run
s = r & 15; // combined length s = r & 15; // combined length
if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
j->code_buffer <<= s; j->code_buffer <<= s;
j->code_bits -= s; j->code_bits -= s;
zig = stbi__jpeg_dezigzag[k++]; zig = stbi__jpeg_dezigzag[k++];
@ -3102,6 +3134,7 @@ static int stbi__process_marker(stbi__jpeg *z, int m)
sizes[i] = stbi__get8(z->s); sizes[i] = stbi__get8(z->s);
n += sizes[i]; n += sizes[i];
} }
if(n > 256) return stbi__err("bad DHT header","Corrupt JPEG"); // Loop over i < n would write past end of values!
L -= 17; L -= 17;
if (tc == 0) { if (tc == 0) {
if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
@ -3267,6 +3300,13 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan)
if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
} }
// check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios
// and I've never seen a non-corrupted JPEG file actually use them
for (i=0; i < s->img_n; ++i) {
if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG");
if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG");
}
// compute interleaved mcu info // compute interleaved mcu info
z->img_h_max = h_max; z->img_h_max = h_max;
z->img_v_max = v_max; z->img_v_max = v_max;
@ -3344,6 +3384,28 @@ static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
return 1; return 1;
} }
static int stbi__skip_jpeg_junk_at_end(stbi__jpeg *j)
{
// some JPEGs have junk at end, skip over it but if we find what looks
// like a valid marker, resume there
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
while (x == 255) { // might be a marker
if (stbi__at_eof(j->s)) return STBI__MARKER_none;
x = stbi__get8(j->s);
if (x != 0x00 && x != 0xff) {
// not a stuffed zero or lead-in to another marker, looks
// like an actual marker, return it
return x;
}
// stuffed zero has x=0 now which ends the loop, meaning we go
// back to regular scan loop.
// repeated 0xff keeps trying to read the next byte of the marker.
}
}
return STBI__MARKER_none;
}
// decode image to YCbCr format // decode image to YCbCr format
static int stbi__decode_jpeg_image(stbi__jpeg *j) static int stbi__decode_jpeg_image(stbi__jpeg *j)
{ {
@ -3360,25 +3422,22 @@ static int stbi__decode_jpeg_image(stbi__jpeg *j)
if (!stbi__process_scan_header(j)) return 0; if (!stbi__process_scan_header(j)) return 0;
if (!stbi__parse_entropy_coded_data(j)) return 0; if (!stbi__parse_entropy_coded_data(j)) return 0;
if (j->marker == STBI__MARKER_none ) { if (j->marker == STBI__MARKER_none ) {
// handle 0s at the end of image data from IP Kamera 9060 j->marker = stbi__skip_jpeg_junk_at_end(j);
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
if (x == 255) {
j->marker = stbi__get8(j->s);
break;
}
}
// if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
} }
m = stbi__get_marker(j);
if (STBI__RESTART(m))
m = stbi__get_marker(j);
} else if (stbi__DNL(m)) { } else if (stbi__DNL(m)) {
int Ld = stbi__get16be(j->s); int Ld = stbi__get16be(j->s);
stbi__uint32 NL = stbi__get16be(j->s); stbi__uint32 NL = stbi__get16be(j->s);
if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG"); if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG"); if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
} else {
if (!stbi__process_marker(j, m)) return 0;
}
m = stbi__get_marker(j); m = stbi__get_marker(j);
} else {
if (!stbi__process_marker(j, m)) return 1;
m = stbi__get_marker(j);
}
} }
if (j->progressive) if (j->progressive)
stbi__jpeg_finish(j); stbi__jpeg_finish(j);
@ -3969,6 +4028,7 @@ static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int re
unsigned char* result; unsigned char* result;
stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
if (!j) return stbi__errpuc("outofmem", "Out of memory"); if (!j) return stbi__errpuc("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
STBI_NOTUSED(ri); STBI_NOTUSED(ri);
j->s = s; j->s = s;
stbi__setup_jpeg(j); stbi__setup_jpeg(j);
@ -3982,6 +4042,7 @@ static int stbi__jpeg_test(stbi__context *s)
int r; int r;
stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
if (!j) return stbi__err("outofmem", "Out of memory"); if (!j) return stbi__err("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
j->s = s; j->s = s;
stbi__setup_jpeg(j); stbi__setup_jpeg(j);
r = stbi__decode_jpeg_header(j, STBI__SCAN_type); r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
@ -4007,6 +4068,7 @@ static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
int result; int result;
stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
if (!j) return stbi__err("outofmem", "Out of memory"); if (!j) return stbi__err("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
j->s = s; j->s = s;
result = stbi__jpeg_info_raw(j, x, y, comp); result = stbi__jpeg_info_raw(j, x, y, comp);
STBI_FREE(j); STBI_FREE(j);
@ -4249,11 +4311,12 @@ static int stbi__parse_huffman_block(stbi__zbuf *a)
a->zout = zout; a->zout = zout;
return 1; return 1;
} }
if (z >= 286) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, length codes 286 and 287 must not appear in compressed data
z -= 257; z -= 257;
len = stbi__zlength_base[z]; len = stbi__zlength_base[z];
if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
z = stbi__zhuffman_decode(a, &a->z_distance); z = stbi__zhuffman_decode(a, &a->z_distance);
if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); if (z < 0 || z >= 30) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, distance codes 30 and 31 must not appear in compressed data
dist = stbi__zdist_base[z]; dist = stbi__zdist_base[z];
if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
@ -4948,7 +5011,7 @@ STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set; static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set;
static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set; static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set;
STBIDEF void stbi__unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply)
{ {
stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply; stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply;
stbi__unpremultiply_on_load_set = 1; stbi__unpremultiply_on_load_set = 1;
@ -5057,14 +5120,13 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
if (!pal_img_n) { if (!pal_img_n) {
s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
if (scan == STBI__SCAN_header) return 1;
} else { } else {
// if paletted, then pal_n is our final components, and // if paletted, then pal_n is our final components, and
// img_n is # components to decompress/filter. // img_n is # components to decompress/filter.
s->img_n = 1; s->img_n = 1;
if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
// if SCAN_header, have to scan to see if we have a tRNS
} }
// even with SCAN_header, have to scan to see if we have a tRNS
break; break;
} }
@ -5096,6 +5158,8 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
has_trans = 1; has_trans = 1;
// non-paletted with tRNS = constant alpha. if header-scanning, we can stop now.
if (scan == STBI__SCAN_header) { ++s->img_n; return 1; }
if (z->depth == 16) { if (z->depth == 16) {
for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
} else { } else {
@ -5108,7 +5172,13 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
case STBI__PNG_TYPE('I','D','A','T'): { case STBI__PNG_TYPE('I','D','A','T'): {
if (first) return stbi__err("first not IHDR", "Corrupt PNG"); if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } if (scan == STBI__SCAN_header) {
// header scan definitely stops at first IDAT
if (pal_img_n)
s->img_n = pal_img_n;
return 1;
}
if (c.length > (1u << 30)) return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes");
if ((int)(ioff + c.length) < (int)ioff) return 0; if ((int)(ioff + c.length) < (int)ioff) return 0;
if (ioff + c.length > idata_limit) { if (ioff + c.length > idata_limit) {
stbi__uint32 idata_limit_old = idata_limit; stbi__uint32 idata_limit_old = idata_limit;
@ -5491,8 +5561,22 @@ static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req
psize = (info.offset - info.extra_read - info.hsz) >> 2; psize = (info.offset - info.extra_read - info.hsz) >> 2;
} }
if (psize == 0) { if (psize == 0) {
if (info.offset != s->callback_already_read + (s->img_buffer - s->img_buffer_original)) { // accept some number of extra bytes after the header, but if the offset points either to before
// the header ends or implies a large amount of extra data, reject the file as malformed
int bytes_read_so_far = s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original);
int header_limit = 1024; // max we actually read is below 256 bytes currently.
int extra_data_limit = 256*4; // what ordinarily goes here is a palette; 256 entries*4 bytes is its max size.
if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) {
return stbi__errpuc("bad header", "Corrupt BMP");
}
// we established that bytes_read_so_far is positive and sensible.
// the first half of this test rejects offsets that are either too small positives, or
// negative, and guarantees that info.offset >= bytes_read_so_far > 0. this in turn
// ensures the number computed in the second half of the test can't overflow.
if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) {
return stbi__errpuc("bad offset", "Corrupt BMP"); return stbi__errpuc("bad offset", "Corrupt BMP");
} else {
stbi__skip(s, info.offset - bytes_read_so_far);
} }
} }
@ -7180,12 +7264,12 @@ static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int re
// Run // Run
value = stbi__get8(s); value = stbi__get8(s);
count -= 128; count -= 128;
if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
for (z = 0; z < count; ++z) for (z = 0; z < count; ++z)
scanline[i++ * 4 + k] = value; scanline[i++ * 4 + k] = value;
} else { } else {
// Dump // Dump
if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
for (z = 0; z < count; ++z) for (z = 0; z < count; ++z)
scanline[i++ * 4 + k] = stbi__get8(s); scanline[i++ * 4 + k] = stbi__get8(s);
} }
@ -7439,10 +7523,17 @@ static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req
out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0); out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0);
if (!out) return stbi__errpuc("outofmem", "Out of memory"); if (!out) return stbi__errpuc("outofmem", "Out of memory");
stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8)); if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) {
STBI_FREE(out);
return stbi__errpuc("bad PNM", "PNM file truncated");
}
if (req_comp && req_comp != s->img_n) { if (req_comp && req_comp != s->img_n) {
if (ri->bits_per_channel == 16) {
out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, s->img_n, req_comp, s->img_x, s->img_y);
} else {
out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
}
if (out == NULL) return out; // stbi__convert_format frees input on failure if (out == NULL) return out; // stbi__convert_format frees input on failure
} }
return out; return out;
@ -7479,6 +7570,8 @@ static int stbi__pnm_getinteger(stbi__context *s, char *c)
while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
value = value*10 + (*c - '0'); value = value*10 + (*c - '0');
*c = (char) stbi__get8(s); *c = (char) stbi__get8(s);
if((value > 214748364) || (value == 214748364 && *c > '7'))
return stbi__err("integer parse overflow", "Parsing an integer in the PPM header overflowed a 32-bit int");
} }
return value; return value;
@ -7509,9 +7602,13 @@ static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
*x = stbi__pnm_getinteger(s, &c); // read width *x = stbi__pnm_getinteger(s, &c); // read width
if(*x == 0)
return stbi__err("invalid width", "PPM image header had zero or overflowing width");
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
*y = stbi__pnm_getinteger(s, &c); // read height *y = stbi__pnm_getinteger(s, &c); // read height
if (*y == 0)
return stbi__err("invalid width", "PPM image header had zero or overflowing width");
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
maxv = stbi__pnm_getinteger(s, &c); // read max value maxv = stbi__pnm_getinteger(s, &c); // read max value

153
test/stb_image.h
View File

@ -1,4 +1,4 @@
/* stb_image - v2.27 - public domain image loader - http://nothings.org/stb /* stb_image - v2.28 - public domain image loader - http://nothings.org/stb
no warranty implied; use at your own risk no warranty implied; use at your own risk
Do this: Do this:
@ -48,6 +48,7 @@ LICENSE
RECENT REVISION HISTORY: RECENT REVISION HISTORY:
2.28 (2023-01-29) many error fixes, security errors, just tons of stuff
2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes 2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes
2.26 (2020-07-13) many minor fixes 2.26 (2020-07-13) many minor fixes
2.25 (2020-02-02) fix warnings 2.25 (2020-02-02) fix warnings
@ -108,7 +109,7 @@ RECENT REVISION HISTORY:
Cass Everitt Ryamond Barbiero github:grim210 Cass Everitt Ryamond Barbiero github:grim210
Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw
Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus
Josh Tobin Matthew Gregan github:poppolopoppo Josh Tobin Neil Bickford Matthew Gregan github:poppolopoppo
Julian Raschke Gregory Mullen Christian Floisand github:darealshinji Julian Raschke Gregory Mullen Christian Floisand github:darealshinji
Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007 Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007
Brad Weinberger Matvey Cherevko github:mosra Brad Weinberger Matvey Cherevko github:mosra
@ -140,7 +141,7 @@ RECENT REVISION HISTORY:
// // ... x = width, y = height, n = # 8-bit components per pixel ... // // ... x = width, y = height, n = # 8-bit components per pixel ...
// // ... replace '0' with '1'..'4' to force that many components per pixel // // ... replace '0' with '1'..'4' to force that many components per pixel
// // ... but 'n' will always be the number that it would have been if you said 0 // // ... but 'n' will always be the number that it would have been if you said 0
// stbi_image_free(data) // stbi_image_free(data);
// //
// Standard parameters: // Standard parameters:
// int *x -- outputs image width in pixels // int *x -- outputs image width in pixels
@ -635,7 +636,7 @@ STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
#endif #endif
#endif #endif
#ifdef _MSC_VER #if defined(_MSC_VER) || defined(__SYMBIAN32__)
typedef unsigned short stbi__uint16; typedef unsigned short stbi__uint16;
typedef signed short stbi__int16; typedef signed short stbi__int16;
typedef unsigned int stbi__uint32; typedef unsigned int stbi__uint32;
@ -1032,7 +1033,7 @@ static int stbi__mad3sizes_valid(int a, int b, int c, int add)
} }
// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow // returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) #if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
{ {
return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
@ -1055,7 +1056,7 @@ static void *stbi__malloc_mad3(int a, int b, int c, int add)
return stbi__malloc(a*b*c + add); return stbi__malloc(a*b*c + add);
} }
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) #if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
{ {
if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
@ -1063,6 +1064,23 @@ static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
} }
#endif #endif
// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1 inclusive), 0 on overflow.
static int stbi__addints_valid(int a, int b)
{
if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow
if (a < 0 && b < 0) return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot overflow since b < 0.
return a <= INT_MAX - b;
}
// returns 1 if the product of two signed shorts is valid, 0 on overflow.
static int stbi__mul2shorts_valid(short a, short b)
{
if (b == 0 || b == -1) return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b doesn't overflow
if ((a >= 0) == (b >= 0)) return a <= SHRT_MAX/b; // product is positive, so similar to mul2sizes_valid
if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN
return a >= SHRT_MIN / b;
}
// stbi__err - error // stbi__err - error
// stbi__errpf - error returning pointer to float // stbi__errpf - error returning pointer to float
// stbi__errpuc - error returning pointer to unsigned char // stbi__errpuc - error returning pointer to unsigned char
@ -1985,9 +2003,12 @@ static int stbi__build_huffman(stbi__huffman *h, int *count)
int i,j,k=0; int i,j,k=0;
unsigned int code; unsigned int code;
// build size list for each symbol (from JPEG spec) // build size list for each symbol (from JPEG spec)
for (i=0; i < 16; ++i) for (i=0; i < 16; ++i) {
for (j=0; j < count[i]; ++j) for (j=0; j < count[i]; ++j) {
h->size[k++] = (stbi_uc) (i+1); h->size[k++] = (stbi_uc) (i+1);
if(k >= 257) return stbi__err("bad size list","Corrupt JPEG");
}
}
h->size[k] = 0; h->size[k] = 0;
// compute actual symbols (from jpeg spec) // compute actual symbols (from jpeg spec)
@ -2112,6 +2133,8 @@ stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
// convert the huffman code to the symbol id // convert the huffman code to the symbol id
c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
if(c < 0 || c >= 256) // symbol id out of bounds!
return -1;
STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
// convert the id to a symbol // convert the id to a symbol
@ -2130,6 +2153,7 @@ stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
unsigned int k; unsigned int k;
int sgn; int sgn;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j); if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative) sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative)
k = stbi_lrot(j->code_buffer, n); k = stbi_lrot(j->code_buffer, n);
@ -2144,6 +2168,7 @@ stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
{ {
unsigned int k; unsigned int k;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j); if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
k = stbi_lrot(j->code_buffer, n); k = stbi_lrot(j->code_buffer, n);
j->code_buffer = k & ~stbi__bmask[n]; j->code_buffer = k & ~stbi__bmask[n];
k &= stbi__bmask[n]; k &= stbi__bmask[n];
@ -2155,6 +2180,7 @@ stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
{ {
unsigned int k; unsigned int k;
if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing
k = j->code_buffer; k = j->code_buffer;
j->code_buffer <<= 1; j->code_buffer <<= 1;
--j->code_bits; --j->code_bits;
@ -2192,8 +2218,10 @@ static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman
memset(data,0,64*sizeof(data[0])); memset(data,0,64*sizeof(data[0]));
diff = t ? stbi__extend_receive(j, t) : 0; diff = t ? stbi__extend_receive(j, t) : 0;
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff; dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc; j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * dequant[0]); data[0] = (short) (dc * dequant[0]);
// decode AC components, see JPEG spec // decode AC components, see JPEG spec
@ -2207,6 +2235,7 @@ static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman
if (r) { // fast-AC path if (r) { // fast-AC path
k += (r >> 4) & 15; // run k += (r >> 4) & 15; // run
s = r & 15; // combined length s = r & 15; // combined length
if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
j->code_buffer <<= s; j->code_buffer <<= s;
j->code_bits -= s; j->code_bits -= s;
// decode into unzigzag'd location // decode into unzigzag'd location
@ -2246,8 +2275,10 @@ static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__
if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
diff = t ? stbi__extend_receive(j, t) : 0; diff = t ? stbi__extend_receive(j, t) : 0;
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff; dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc; j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * (1 << j->succ_low)); data[0] = (short) (dc * (1 << j->succ_low));
} else { } else {
// refinement scan for DC coefficient // refinement scan for DC coefficient
@ -2282,6 +2313,7 @@ static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__
if (r) { // fast-AC path if (r) { // fast-AC path
k += (r >> 4) & 15; // run k += (r >> 4) & 15; // run
s = r & 15; // combined length s = r & 15; // combined length
if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
j->code_buffer <<= s; j->code_buffer <<= s;
j->code_bits -= s; j->code_bits -= s;
zig = stbi__jpeg_dezigzag[k++]; zig = stbi__jpeg_dezigzag[k++];
@ -3102,6 +3134,7 @@ static int stbi__process_marker(stbi__jpeg *z, int m)
sizes[i] = stbi__get8(z->s); sizes[i] = stbi__get8(z->s);
n += sizes[i]; n += sizes[i];
} }
if(n > 256) return stbi__err("bad DHT header","Corrupt JPEG"); // Loop over i < n would write past end of values!
L -= 17; L -= 17;
if (tc == 0) { if (tc == 0) {
if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
@ -3267,6 +3300,13 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan)
if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
} }
// check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios
// and I've never seen a non-corrupted JPEG file actually use them
for (i=0; i < s->img_n; ++i) {
if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG");
if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG");
}
// compute interleaved mcu info // compute interleaved mcu info
z->img_h_max = h_max; z->img_h_max = h_max;
z->img_v_max = v_max; z->img_v_max = v_max;
@ -3344,6 +3384,28 @@ static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
return 1; return 1;
} }
static int stbi__skip_jpeg_junk_at_end(stbi__jpeg *j)
{
// some JPEGs have junk at end, skip over it but if we find what looks
// like a valid marker, resume there
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
while (x == 255) { // might be a marker
if (stbi__at_eof(j->s)) return STBI__MARKER_none;
x = stbi__get8(j->s);
if (x != 0x00 && x != 0xff) {
// not a stuffed zero or lead-in to another marker, looks
// like an actual marker, return it
return x;
}
// stuffed zero has x=0 now which ends the loop, meaning we go
// back to regular scan loop.
// repeated 0xff keeps trying to read the next byte of the marker.
}
}
return STBI__MARKER_none;
}
// decode image to YCbCr format // decode image to YCbCr format
static int stbi__decode_jpeg_image(stbi__jpeg *j) static int stbi__decode_jpeg_image(stbi__jpeg *j)
{ {
@ -3360,25 +3422,22 @@ static int stbi__decode_jpeg_image(stbi__jpeg *j)
if (!stbi__process_scan_header(j)) return 0; if (!stbi__process_scan_header(j)) return 0;
if (!stbi__parse_entropy_coded_data(j)) return 0; if (!stbi__parse_entropy_coded_data(j)) return 0;
if (j->marker == STBI__MARKER_none ) { if (j->marker == STBI__MARKER_none ) {
// handle 0s at the end of image data from IP Kamera 9060 j->marker = stbi__skip_jpeg_junk_at_end(j);
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
if (x == 255) {
j->marker = stbi__get8(j->s);
break;
}
}
// if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
} }
m = stbi__get_marker(j);
if (STBI__RESTART(m))
m = stbi__get_marker(j);
} else if (stbi__DNL(m)) { } else if (stbi__DNL(m)) {
int Ld = stbi__get16be(j->s); int Ld = stbi__get16be(j->s);
stbi__uint32 NL = stbi__get16be(j->s); stbi__uint32 NL = stbi__get16be(j->s);
if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG"); if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG"); if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
} else {
if (!stbi__process_marker(j, m)) return 0;
}
m = stbi__get_marker(j); m = stbi__get_marker(j);
} else {
if (!stbi__process_marker(j, m)) return 1;
m = stbi__get_marker(j);
}
} }
if (j->progressive) if (j->progressive)
stbi__jpeg_finish(j); stbi__jpeg_finish(j);
@ -3969,6 +4028,7 @@ static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int re
unsigned char* result; unsigned char* result;
stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
if (!j) return stbi__errpuc("outofmem", "Out of memory"); if (!j) return stbi__errpuc("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
STBI_NOTUSED(ri); STBI_NOTUSED(ri);
j->s = s; j->s = s;
stbi__setup_jpeg(j); stbi__setup_jpeg(j);
@ -3982,6 +4042,7 @@ static int stbi__jpeg_test(stbi__context *s)
int r; int r;
stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
if (!j) return stbi__err("outofmem", "Out of memory"); if (!j) return stbi__err("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
j->s = s; j->s = s;
stbi__setup_jpeg(j); stbi__setup_jpeg(j);
r = stbi__decode_jpeg_header(j, STBI__SCAN_type); r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
@ -4007,6 +4068,7 @@ static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
int result; int result;
stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
if (!j) return stbi__err("outofmem", "Out of memory"); if (!j) return stbi__err("outofmem", "Out of memory");
memset(j, 0, sizeof(stbi__jpeg));
j->s = s; j->s = s;
result = stbi__jpeg_info_raw(j, x, y, comp); result = stbi__jpeg_info_raw(j, x, y, comp);
STBI_FREE(j); STBI_FREE(j);
@ -4249,11 +4311,12 @@ static int stbi__parse_huffman_block(stbi__zbuf *a)
a->zout = zout; a->zout = zout;
return 1; return 1;
} }
if (z >= 286) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, length codes 286 and 287 must not appear in compressed data
z -= 257; z -= 257;
len = stbi__zlength_base[z]; len = stbi__zlength_base[z];
if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
z = stbi__zhuffman_decode(a, &a->z_distance); z = stbi__zhuffman_decode(a, &a->z_distance);
if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); if (z < 0 || z >= 30) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, distance codes 30 and 31 must not appear in compressed data
dist = stbi__zdist_base[z]; dist = stbi__zdist_base[z];
if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
@ -4948,7 +5011,7 @@ STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set; static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set;
static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set; static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set;
STBIDEF void stbi__unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply)
{ {
stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply; stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply;
stbi__unpremultiply_on_load_set = 1; stbi__unpremultiply_on_load_set = 1;
@ -5057,14 +5120,13 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
if (!pal_img_n) { if (!pal_img_n) {
s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
if (scan == STBI__SCAN_header) return 1;
} else { } else {
// if paletted, then pal_n is our final components, and // if paletted, then pal_n is our final components, and
// img_n is # components to decompress/filter. // img_n is # components to decompress/filter.
s->img_n = 1; s->img_n = 1;
if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
// if SCAN_header, have to scan to see if we have a tRNS
} }
// even with SCAN_header, have to scan to see if we have a tRNS
break; break;
} }
@ -5096,6 +5158,8 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
has_trans = 1; has_trans = 1;
// non-paletted with tRNS = constant alpha. if header-scanning, we can stop now.
if (scan == STBI__SCAN_header) { ++s->img_n; return 1; }
if (z->depth == 16) { if (z->depth == 16) {
for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
} else { } else {
@ -5108,7 +5172,13 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
case STBI__PNG_TYPE('I','D','A','T'): { case STBI__PNG_TYPE('I','D','A','T'): {
if (first) return stbi__err("first not IHDR", "Corrupt PNG"); if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } if (scan == STBI__SCAN_header) {
// header scan definitely stops at first IDAT
if (pal_img_n)
s->img_n = pal_img_n;
return 1;
}
if (c.length > (1u << 30)) return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes");
if ((int)(ioff + c.length) < (int)ioff) return 0; if ((int)(ioff + c.length) < (int)ioff) return 0;
if (ioff + c.length > idata_limit) { if (ioff + c.length > idata_limit) {
stbi__uint32 idata_limit_old = idata_limit; stbi__uint32 idata_limit_old = idata_limit;
@ -5491,8 +5561,22 @@ static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req
psize = (info.offset - info.extra_read - info.hsz) >> 2; psize = (info.offset - info.extra_read - info.hsz) >> 2;
} }
if (psize == 0) { if (psize == 0) {
if (info.offset != s->callback_already_read + (s->img_buffer - s->img_buffer_original)) { // accept some number of extra bytes after the header, but if the offset points either to before
// the header ends or implies a large amount of extra data, reject the file as malformed
int bytes_read_so_far = s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original);
int header_limit = 1024; // max we actually read is below 256 bytes currently.
int extra_data_limit = 256*4; // what ordinarily goes here is a palette; 256 entries*4 bytes is its max size.
if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) {
return stbi__errpuc("bad header", "Corrupt BMP");
}
// we established that bytes_read_so_far is positive and sensible.
// the first half of this test rejects offsets that are either too small positives, or
// negative, and guarantees that info.offset >= bytes_read_so_far > 0. this in turn
// ensures the number computed in the second half of the test can't overflow.
if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) {
return stbi__errpuc("bad offset", "Corrupt BMP"); return stbi__errpuc("bad offset", "Corrupt BMP");
} else {
stbi__skip(s, info.offset - bytes_read_so_far);
} }
} }
@ -7180,12 +7264,12 @@ static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int re
// Run // Run
value = stbi__get8(s); value = stbi__get8(s);
count -= 128; count -= 128;
if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
for (z = 0; z < count; ++z) for (z = 0; z < count; ++z)
scanline[i++ * 4 + k] = value; scanline[i++ * 4 + k] = value;
} else { } else {
// Dump // Dump
if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
for (z = 0; z < count; ++z) for (z = 0; z < count; ++z)
scanline[i++ * 4 + k] = stbi__get8(s); scanline[i++ * 4 + k] = stbi__get8(s);
} }
@ -7439,10 +7523,17 @@ static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req
out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0); out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0);
if (!out) return stbi__errpuc("outofmem", "Out of memory"); if (!out) return stbi__errpuc("outofmem", "Out of memory");
stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8)); if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) {
STBI_FREE(out);
return stbi__errpuc("bad PNM", "PNM file truncated");
}
if (req_comp && req_comp != s->img_n) { if (req_comp && req_comp != s->img_n) {
if (ri->bits_per_channel == 16) {
out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, s->img_n, req_comp, s->img_x, s->img_y);
} else {
out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
}
if (out == NULL) return out; // stbi__convert_format frees input on failure if (out == NULL) return out; // stbi__convert_format frees input on failure
} }
return out; return out;
@ -7479,6 +7570,8 @@ static int stbi__pnm_getinteger(stbi__context *s, char *c)
while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
value = value*10 + (*c - '0'); value = value*10 + (*c - '0');
*c = (char) stbi__get8(s); *c = (char) stbi__get8(s);
if((value > 214748364) || (value == 214748364 && *c > '7'))
return stbi__err("integer parse overflow", "Parsing an integer in the PPM header overflowed a 32-bit int");
} }
return value; return value;
@ -7509,9 +7602,13 @@ static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
*x = stbi__pnm_getinteger(s, &c); // read width *x = stbi__pnm_getinteger(s, &c); // read width
if(*x == 0)
return stbi__err("invalid width", "PPM image header had zero or overflowing width");
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
*y = stbi__pnm_getinteger(s, &c); // read height *y = stbi__pnm_getinteger(s, &c); // read height
if (*y == 0)
return stbi__err("invalid width", "PPM image header had zero or overflowing width");
stbi__pnm_skip_whitespace(s, &c); stbi__pnm_skip_whitespace(s, &c);
maxv = stbi__pnm_getinteger(s, &c); // read max value maxv = stbi__pnm_getinteger(s, &c); // read max value